diff --git a/A00_Common/design/design_selection.ts b/A00_Common/design/design_selection.ts
index 0e16185a5..df7a528ef 100644
--- a/A00_Common/design/design_selection.ts
+++ b/A00_Common/design/design_selection.ts
@@ -13,7 +13,7 @@
 
 import { readState, writeState } from "../b_page_state";
 
-/** 관 · 구조물 찾는 거리(m) — 관은 계획선에 스냅돼 측점과 살짝 어긋난다. 이 값이 유일하다. */
+/** 관 · 구조물 찾는 거리(m) — 기준 측점은 정수 m(234-1) · 옛 소수 자료도 같은 자리로 봄. 이 값이 유일하다. */
 export const PIPE_MATCH_M = 0.51;
 
 export interface DesignSelection {
diff --git a/B04_PreProcess/B04_PreProcess_UI_Basins.ts b/B04_PreProcess/B04_PreProcess_UI_Basins.ts
index 251369cf8..39b93d257 100644
--- a/B04_PreProcess/B04_PreProcess_UI_Basins.ts
+++ b/B04_PreProcess/B04_PreProcess_UI_Basins.ts
@@ -40,6 +40,7 @@ import {
   resampleRoute,
   type RoutePoint,
 } from "./B04_PreProcess_UI_RouteSamples";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 
 function L(key: keyof typeof ui_locales): string {
   return ui_locales[key][currentLanguageIndex];
@@ -296,7 +297,7 @@ export function createDetailBasinOverlay(onChange: () => void): DetailBasinOverl
   function selectBasinOfPipe(pipeIndex: number): void {
     const pipe = pipes[pipeIndex];
     if (!pipe) return;
-    const basin = basins.find((item) => Math.abs(item.chainage_m - pipe.chainage) < 0.51);
+    const basin = basins.find((item) => Math.abs(item.chainage_m - pipe.chainage) < PIPE_MATCH_M);
     selectedBasin = basin && basin.index !== selectedBasin ? basin.index : null;
     say(summary());
   }
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Ford_Fill.ts b/B05_Profile/B05_Profile_UI_Drainage_Ford_Fill.ts
index 4e9983648..f412bcb3a 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Ford_Fill.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Ford_Fill.ts
@@ -12,6 +12,7 @@ import {
   FORD_PAVEMENT_DEFAULT_WIDTH_M,
 } from "@config/config_frontend";
 import { fordHeightM } from "../A00_Common/design/design_structure_ford_calc";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 
 const FORD_KINDS: Record<string, number> = {
   ford_bridge: FORD_BRIDGE_DEFAULT_WIDTH_M,
@@ -39,7 +40,7 @@ export function fillFordHeights(
 ): boolean {
   let filled = false;
   for (const wait of [...pending]) {
-    const point = points.find((entry) => Math.abs(entry.chainage_m - wait) < 0.51);
+    const point = points.find((entry) => Math.abs(entry.chainage_m - wait) < PIPE_MATCH_M);
     if (!point?.facility || !(point.facility in FORD_KINDS)) {
       pending.delete(wait); // 관이 사라졌거나 종류가 바뀜
       continue;
@@ -48,7 +49,9 @@ export function fillFordHeights(
       pending.delete(wait); // 사용자가 넣은 값 — 안 덮음
       continue;
     }
-    const flow = basins.find((entry) => Math.abs(entry.chainage_m - point.chainage_m) < 0.51);
+    const flow = basins.find(
+      (entry) => Math.abs(entry.chainage_m - point.chainage_m) < PIPE_MATCH_M,
+    );
     const width = Number(point.options?.ford_width_m) || FORD_KINDS[point.facility];
     const need = fordHeightM(flow?.design_flow_m3s ?? null, width);
     if (need === null) continue; // 유량 아직 없음 — 다음 응답까지 빈칸
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Panel.ts b/B05_Profile/B05_Profile_UI_Drainage_Panel.ts
index 1deeea3c5..d34b96d10 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Panel.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Panel.ts
@@ -30,6 +30,8 @@ import type { FlowArrow } from "../B04_PreProcess/B04_PreProcess_UI_FlowArrows";
 import { buildStrengthArray } from "../B04_PreProcess/B04_PreProcess_UI_FlowRamp";
 import { resampleRoute } from "../B04_PreProcess/B04_PreProcess_UI_RouteSamples";
 import { createPipeEditor } from "./B05_Profile_UI_Drainage_Pipes";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
+import { snapStructureStation } from "../common_util/common_util_structure_station";
 import { createFacilityStore } from "./B05_Profile_UI_Drainage_Facility";
 import { mergeFacilityOptions } from "./B05_Profile_UI_Drainage_Facility_Merge";
 import { readPendingPipes, writePendingPipes } from "./B05_Profile_Api_Pipes_Draft";
@@ -571,15 +573,17 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
     movePipe(fromChainage, toChainage) {
       const index = pipeEditor
         .pipes()
-        .findIndex((pipe) => Math.abs(pipe.chainage_m - fromChainage) < 0.51);
+        .findIndex((pipe) => Math.abs(pipe.chainage_m - fromChainage) < PIPE_MATCH_M);
       if (index < 0) return;
-      pipeEditor.moveTo(index, toChainage);
+      const to = snapStructureStation(toChainage); // 정수 m(234-1) — 시설 속성도 새 자리로(지도 끌기와 같게)
+      facilityStore.move(pipeEditor.pipes()[index].chainage_m, to);
+      pipeEditor.moveTo(index, to);
     },
     selectBasinByChainage(chainageM) {
       const picked =
         chainageM === null
           ? null
-          : (basins.find((basin) => Math.abs(basin.chainage_m - chainageM) < 0.51) ?? null);
+          : (basins.find((basin) => Math.abs(basin.chainage_m - chainageM) < PIPE_MATCH_M) ?? null);
       // 밖에서 온 요청이므로 되돌려 보내지 않는다(그래프 ↔ 유역 순환 차단).
       selectBasin(picked ? picked.index : null, false);
     },
@@ -605,12 +609,16 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
       scheduleDraw();
     },
     addPipe(chainageM, attributes) {
+      chainageM = snapStructureStation(chainageM); // 관 기준 측점 = 정수 m(234-1)
       // 시설 정보를 먼저 보관해야 addAtChainage가 촉발하는 재계산 요청에 실려 간다.
       facilityStore.set(chainageM, attributes ?? null);
       if (waitsFordHeight(attributes?.facility, attributes?.options)) fordWaits.add(chainageM);
       pipeEditor.addAtChainage(chainageM);
     },
     updatePipeFacility(fromChainageM, toChainageM, attributes) {
+      // 옮겼으면 정수 m · 속성 열쇠도 그 자리로(234-1) — 값만 고친 옛 소수 관은 제자리
+      if (Math.abs(toChainageM - fromChainageM) > 0.005)
+        toChainageM = snapStructureStation(toChainageM);
       // ⚠ 통째로 갈아 끼우지 않음 — 폼이 모르는 칸(집계표로 적은 기초 등)을 지키려 이어 붙임.
       const previous = facilityStore.get(fromChainageM);
       facilityStore.set(fromChainageM, null);
@@ -621,7 +629,7 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
         // attach가 새 위치로 시설 정보를 승계한다.
         const index = pipeEditor
           .pipes()
-          .findIndex((pipe) => Math.abs(pipe.chainage_m - fromChainageM) < 0.51);
+          .findIndex((pipe) => Math.abs(pipe.chainage_m - fromChainageM) < PIPE_MATCH_M);
         if (index >= 0) pipeEditor.moveTo(index, toChainageM);
         else void analyze();
       } else {
@@ -634,7 +642,7 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
     removePipe(chainageM) {
       const index = pipeEditor
         .pipes()
-        .findIndex((pipe) => Math.abs(pipe.chainage_m - chainageM) < 0.51);
+        .findIndex((pipe) => Math.abs(pipe.chainage_m - chainageM) < PIPE_MATCH_M);
       if (index < 0) return;
       pipeEditor.select(index);
       pipeEditor.deleteSelected();
@@ -643,7 +651,9 @@ export function createDrainagePanel(callbacks: DrainagePanelCallbacks = {}): Dra
       const index =
         chainageM === null
           ? null
-          : pipeEditor.pipes().findIndex((pipe) => Math.abs(pipe.chainage_m - chainageM) < 0.51);
+          : pipeEditor
+              .pipes()
+              .findIndex((pipe) => Math.abs(pipe.chainage_m - chainageM) < PIPE_MATCH_M);
       const next = index === -1 ? null : index;
       if (pipeEditor.selected() === next) return;
       // select()는 onChange를 울리지 않는다 — 폼·유역·재그리기를 직접 맞춘다.
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Parts.ts b/B05_Profile/B05_Profile_UI_Drainage_Parts.ts
index 3a9d17fab..88036c07d 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Parts.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Parts.ts
@@ -21,6 +21,7 @@ import { normalizeStrength, rampColor } from "../B04_PreProcess/B04_PreProcess_U
 import type { MapContextMenu, MapContextMenuItem } from "@ui/ui_template_context_menu";
 import type { DetailBasin } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
 import type { PipeEditor, PipePoint } from "./B05_Profile_UI_Drainage_Pipes";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 
 function L(key: keyof typeof ui_locales): string {
   return ui_locales[key][currentLanguageIndex];
@@ -352,7 +353,7 @@ export function reconcilePipes(
     return null;
   }
   return next.map((chainage) => {
-    const matched = before.find((pipe) => Math.abs(pipe.chainage_m - chainage) < 0.51);
+    const matched = before.find((pipe) => Math.abs(pipe.chainage_m - chainage) < PIPE_MATCH_M);
     return { chainage_m: chainage, reason: matched?.reason ?? "confirmed" };
   });
 }
@@ -516,7 +517,7 @@ export function createProgressReporter(progress: {
 
 /** 배관 마커 색 — 같은 누가거리 유역의 파스텔색(불투명). 유역이 없으면 회색. */
 export function pipeMarkerColor(basins: ReadonlyArray<DetailBasin>, chainageM: number): string {
-  const basin = basins.find((item) => Math.abs(item.chainage_m - chainageM) < 0.51);
+  const basin = basins.find((item) => Math.abs(item.chainage_m - chainageM) < PIPE_MATCH_M);
   if (!basin) return themeColor("--map-pipe-orphan", "#e5e7eb");
   return basinColor(basin.index).replace(/0\.45\)$/, "1)");
 }
@@ -527,7 +528,7 @@ export function basinIndexOfPipe(
   pipe: { chainage_m: number } | null,
 ): number | null {
   if (!pipe) return null;
-  const basin = basins.find((item) => Math.abs(item.chainage_m - pipe.chainage_m) < 0.51);
+  const basin = basins.find((item) => Math.abs(item.chainage_m - pipe.chainage_m) < PIPE_MATCH_M);
   return basin ? basin.index : null;
 }
 
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Pipes.ts b/B05_Profile/B05_Profile_UI_Drainage_Pipes.ts
index 5ac77fbf0..864188844 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Pipes.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Pipes.ts
@@ -1,6 +1,7 @@
 import { themeColor } from "@ui/ui_template_palette";
 import type { VWorldMeta } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
 import type { ViewState } from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
+import { snapStructureStation } from "../common_util/common_util_structure_station";
 
 // 배관(관 매설) 지점 편집기 — 배수유역 패널의 계획선 위 마커 표시·추가·이동·삭제.
 // 마커 위치의 단일 소스는 누가거리(chainage)다. 화면 좌표는 매 프레임 노선
@@ -74,6 +75,9 @@ export function createPipeEditor(
   /** 마커를 잡은 화면 좌표 — 이 자리에서 DRAG_START_PX를 벗어나야 이동이 시작된다
    *  (2026-08-19 사용자 보고: 고르려다 관이 옮겨지는 민감도 문제). */
   let dragDownAt: { x: number; y: number } | null = null;
+  /** 노선 안 · 관 기준 측점 = 정수 m(일반 측점 1 m 안이면 그 측점 · 234-1). */
+  const onRoute = (chainageM: number): number =>
+    Math.min(snapStructureStation(Math.max(0, Math.min(totalChainage, chainageM))), totalChainage);
 
   /** 화면 → 사업지 좌표계 m (MapRender affine의 역변환). */
   function screenToMetric(
@@ -199,14 +203,14 @@ export function createPipeEditor(
     moveTo(index, chainageM) {
       const pipe = pipeList[index];
       if (!pipe) return;
-      pipe.chainage_m = Math.max(0, Math.min(totalChainage, chainageM));
+      pipe.chainage_m = onRoute(chainageM);
       pipe.reason = "confirmed";
       sortPipes();
       onChange();
       onCommit();
     },
     addAtChainage(chainageM) {
-      const clamped = Math.max(0, Math.min(totalChainage, chainageM));
+      const clamped = onRoute(chainageM);
       pipeList.push({ chainage_m: clamped, reason: "confirmed" });
       sortPipes();
       selectedIndex = pipeList.findIndex((pipe) => Math.abs(pipe.chainage_m - clamped) < 1e-6);
@@ -224,18 +228,17 @@ export function createPipeEditor(
       if (!metric) return null;
       const nearest = nearestChainage(metric.x, metric.y);
       if (!nearest || nearest.distance * pxPerMeter(view) > ADD_SNAP_PX) return null;
-      return Number(nearest.chainage.toFixed(2));
+      return onRoute(nearest.chainage);
     },
     addAt(view, screenX, screenY) {
       const metric = screenToMetric(view, screenX, screenY);
       if (!metric) return false;
       const nearest = nearestChainage(metric.x, metric.y);
       if (!nearest || nearest.distance * pxPerMeter(view) > ADD_SNAP_PX) return false;
-      pipeList.push({ chainage_m: nearest.chainage, reason: "confirmed" });
+      const at = onRoute(nearest.chainage);
+      pipeList.push({ chainage_m: at, reason: "confirmed" });
       sortPipes();
-      selectedIndex = pipeList.findIndex(
-        (pipe) => Math.abs(pipe.chainage_m - nearest.chainage) < 1e-6,
-      );
+      selectedIndex = pipeList.findIndex((pipe) => Math.abs(pipe.chainage_m - at) < 1e-6);
       onChange();
       onCommit();
       return true;
@@ -271,8 +274,7 @@ export function createPipeEditor(
       if (!metric) return true;
       const nearest = nearestChainage(metric.x, metric.y);
       if (!nearest) return true;
-      const clamped = Math.max(0, Math.min(totalChainage, nearest.chainage));
-      pipeList[draggingIndex].chainage_m = clamped;
+      pipeList[draggingIndex].chainage_m = onRoute(nearest.chainage);
       pipeList[draggingIndex].reason = "confirmed";
       dragMoved = true;
       onChange();
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Report.ts b/B05_Profile/B05_Profile_UI_Drainage_Report.ts
index d5596c4ca..ea809b3a2 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Report.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Report.ts
@@ -7,6 +7,7 @@
 import type { DetailBasin, PipeSource } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
 import type { createFacilityStore } from "./B05_Profile_UI_Drainage_Facility";
 import type { DrainagePipeReport } from "./B05_Profile_UI_Drainage_Panel_Types";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 
 /** 관마다 담당 유역의 배수 유효직경을 붙인다(±0.5m 매칭). 유역 없는 관은 null.
  *  세월교 검토 유역(bridge_required)도 null — 관 규격을 최대치로 올려 봐야 무의미하고,
@@ -20,7 +21,7 @@ export function buildPipeReports(
 ): DrainagePipeReport[] {
   return pipes.map((pipe) => {
     const chainage = Math.round(pipe.chainage_m * 100) / 100;
-    const basin = basins.find((entry) => Math.abs(entry.chainage_m - chainage) < 0.51);
+    const basin = basins.find((entry) => Math.abs(entry.chainage_m - chainage) < PIPE_MATCH_M);
     const attributes = facilityStore.get(chainage);
     return {
       chainage_m: chainage,
diff --git a/B05_Profile/B05_Profile_UI_IrregularStations.ts b/B05_Profile/B05_Profile_UI_IrregularStations.ts
index 798caaf8a..07e7b3e12 100644
--- a/B05_Profile/B05_Profile_UI_IrregularStations.ts
+++ b/B05_Profile/B05_Profile_UI_IrregularStations.ts
@@ -23,6 +23,7 @@ import {
   pickPipeDiameter,
   type StructureType,
 } from "@config/config_frontend";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 
 export interface IrregularStation {
   id: string;
@@ -480,7 +481,9 @@ export function createIrregularStationsSection(
         // 사용자 보고). 종류를 갖춘 사용자 추가 항목은 자리가 겹쳐도 건드리지 않는다.
         const restoredGhost =
           entry.structureType === undefined &&
-          incomingChainages.some((chainage) => Math.abs(entry.chainage_m - chainage) < 0.51);
+          incomingChainages.some(
+            (chainage) => Math.abs(entry.chainage_m - chainage) < PIPE_MATCH_M,
+          );
         if (isPipeStation(entry) || restoredGhost) stations.splice(index, 1);
       }
       pipes.forEach((pipe) => {
@@ -488,7 +491,7 @@ export function createIrregularStationsSection(
         const effective = typeof pipe === "number" ? null : (pipe.effective_diameter_mm ?? null);
         const { station, remainder } = splitChainage(chainage);
         const kept = previousPipes.find(
-          (entry) => entry.userSized && Math.abs(entry.chainage_m - chainage) < 0.51,
+          (entry) => entry.userSized && Math.abs(entry.chainage_m - chainage) < PIPE_MATCH_M,
         );
         const pipeType = kept?.pipeType ?? PIPE_DEFAULT_TYPE;
         const diameterMm = kept?.diameterMm ?? pickPipeDiameter(pipeType, effective);
@@ -530,7 +533,9 @@ export function createIrregularStationsSection(
       callbacks.onChange([...stations]);
     },
     removeByChainage(chainageM) {
-      const index = stations.findIndex((entry) => Math.abs(entry.chainage_m - chainageM) < 0.51);
+      const index = stations.findIndex(
+        (entry) => Math.abs(entry.chainage_m - chainageM) < PIPE_MATCH_M,
+      );
       if (index < 0) return null;
       const [removed] = stations.splice(index, 1);
       if (editingId === removed.id) loadForm(null);
@@ -540,7 +545,7 @@ export function createIrregularStationsSection(
     },
     moveByChainage(fromChainageM, toChainageM) {
       const index = stations.findIndex(
-        (entry) => Math.abs(entry.chainage_m - fromChainageM) < 0.51,
+        (entry) => Math.abs(entry.chainage_m - fromChainageM) < PIPE_MATCH_M,
       );
       if (index < 0) return false;
       const { station, remainder } = splitChainage(toChainageM);
diff --git a/B05_Profile/B05_Profile_UI_Page_Structures.ts b/B05_Profile/B05_Profile_UI_Page_Structures.ts
index 8518459e2..70d0400fa 100644
--- a/B05_Profile/B05_Profile_UI_Page_Structures.ts
+++ b/B05_Profile/B05_Profile_UI_Page_Structures.ts
@@ -33,6 +33,7 @@ import type { createRoutePanel } from "./B05_Profile_UI_Panel";
 import type { createRouteProfilePanel } from "./B05_Profile_UI_Profile_Panel";
 import { FACILITY_NAMES } from "./B05_Profile_UI_Page_Helpers";
 import { followedStation } from "./B05_Profile_UI_Profile_Alignment";
+import { followSnapped } from "./B05_Profile_UI_Structures_Snap";
 
 /** 관 지점 한 건 — 유효직경·시설 종류·부속 옵션까지 그대로 받는다. */
 export interface PipeProjection {
@@ -114,7 +115,8 @@ export function createStructuresBridge(deps: StructuresBridgeDeps) {
     );
     const born = stations.filter((station) => !oldKeys.has(station.chainage_m.toFixed(3)));
     gone.forEach((station) => {
-      const same = followedStation(station, gone, born);
+      // 없으면 맞춘 자리의 새 측점 — [정수 맞춤]이 여럿을 한꺼번에 옮겨도 편집이 따라감(234-1)
+      const same = followedStation(station, gone, born) ?? followSnapped(station, born);
       deps.profilePanel().resetStationEdit(station.chainage_m, same?.chainage_m);
     });
     irregularStations = stations;
diff --git a/B05_Profile/B05_Profile_UI_Profile_Panel_Tools.ts b/B05_Profile/B05_Profile_UI_Profile_Panel_Tools.ts
index 64127e8f2..f8a1a2950 100644
--- a/B05_Profile/B05_Profile_UI_Profile_Panel_Tools.ts
+++ b/B05_Profile/B05_Profile_UI_Profile_Panel_Tools.ts
@@ -31,8 +31,9 @@ import type { IrregularStation } from "./B05_Profile_UI_IrregularStations";
 import { createFreeDraw } from "../A00_Common/design/design_profile_free";
 import { createFreeView, type FreeChartGeom } from "../A00_Common/design/design_profile_free_view";
 import { arrowsBelongToProfile } from "../B06_Section/B06_Section_UI_Cross_Panel_Base";
+import { stepStructureStation } from "../common_util/common_util_structure_station";
 
-/** 방향키 한 번에 움직이는 양(m) — 계획고·누가거리 모두 같다(사용자 확정). */
+/** 방향키 ▲▼ 한 번에 움직이는 계획고(m) — 좌우(구조물 측점)는 1 m 걸음(234-1 · `stepStructureStation`). */
 const KEY_STEP_M = 0.1;
 
 /** 구조물(관) 위치를 이력에 태우는 세션 키 — `b05:` 접두라 스냅샷 대상에 든다. */
@@ -234,8 +235,8 @@ export function createPanelTools(ctx: PanelToolsContext): PanelTools {
     // 기다리지 못하므로 지금 자리를 여기서 센다. 안 그러면 매 반복이 같은 자리를 다시 지시해
     // 0.1m 만 움직이고 멈춤(2026-09-04 실측).
     const fromM = holdChainageM ?? station.chainage_m;
-    const next = Number((fromM + (key === "ArrowRight" ? KEY_STEP_M : -KEY_STEP_M)).toFixed(3));
-    if (next < 0) return false;
+    const next = stepStructureStation(fromM, key === "ArrowRight" ? 1 : -1);
+    if (next === fromM) return false;
     ctx.moveStation({ ...station, chainage_m: fromM }, next);
     holdStation = station;
     holdChainageM = next;
diff --git a/B05_Profile/B05_Profile_UI_Profile_Structures.ts b/B05_Profile/B05_Profile_UI_Profile_Structures.ts
index 6e2f67b27..5649dbd79 100644
--- a/B05_Profile/B05_Profile_UI_Profile_Structures.ts
+++ b/B05_Profile/B05_Profile_UI_Profile_Structures.ts
@@ -17,6 +17,7 @@ import {
 } from "./B05_Profile_UI_IrregularStations";
 import { structureAnchorM, type StructureInstance } from "./B05_Profile_Api_Structures";
 import type { PickGroup } from "./B05_Profile_UI_Structures_Panel_Types";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 
 /** 사이드 「구조물 배치」 군 · 종류 드롭다운 목록(`section.pickGroups()`)을 그대로 구조물군 → 종류
  *  2단 메뉴 항목으로(129-1 — 종단그래프 · 배수유역도 · 3D · B06 종단 공용 · 가린 군 · 종류는 뺌).
@@ -118,7 +119,7 @@ export function mountStructureMenu(host: HTMLElement, options: StructureLineOpti
 }
 
 /** 같은 자리로 볼 여유(m) — 측점선과 알약은 같은 누가거리를 쓰지만 소수점이 갈린다. */
-export const SAME_CHAINAGE_M = 0.51;
+export const SAME_CHAINAGE_M = PIPE_MATCH_M;
 
 /**
  * 측점선 id ↔ 알약(구조물) id 짝짓기.
diff --git a/B05_Profile/B05_Profile_UI_Structures_Fields.ts b/B05_Profile/B05_Profile_UI_Structures_Fields.ts
index 95181eb53..d1bb93c0d 100644
--- a/B05_Profile/B05_Profile_UI_Structures_Fields.ts
+++ b/B05_Profile/B05_Profile_UI_Structures_Fields.ts
@@ -10,6 +10,7 @@
 import { chainageToStation, stationToChainage } from "./B05_Profile_Util_Station";
 import { DEFAULT_BASIN_SHAPE } from "../B06_Section/B06_Section_UI_Cross_Culvert_Basin";
 import { fillPipeHeights } from "../common_util/common_util_culvert_sets";
+import { snapStructureStation } from "../common_util/common_util_structure_station";
 
 export function field(labelText: string, input: HTMLElement): HTMLLabelElement {
   const wrapper = document.createElement("label");
@@ -141,7 +142,7 @@ export function stationFields(
 ): StationFields {
   const station = numberInput("1", "0");
   station.placeholder = "측점";
-  const remainder = numberInput("0.1", "0");
+  const remainder = numberInput("1", "0"); // 기준 측점 = 정수 m(234-1)
   remainder.placeholder = "+m";
   const pair = document.createElement("div");
   pair.className = "b05-structure__station-pair";
@@ -195,7 +196,8 @@ export function stationFields(
       const valid =
         Number.isFinite(stationNo) && stationNo >= 0 && Number.isFinite(rest) && rest >= 0;
       markInvalid(!valid);
-      return valid ? stationNo * intervalM + rest : null;
+      // 친 값은 정수 m · 일반 측점 1 m 안이면 그 측점(234-1) — 안 고친 칸은 위에서 옛 값 그대로
+      return valid ? snapStructureStation(stationNo * intervalM + rest) : null;
     },
     write(chainageM, intervalM) {
       written = null;
diff --git a/B05_Profile/B05_Profile_UI_Structures_Panel.ts b/B05_Profile/B05_Profile_UI_Structures_Panel.ts
index 526d27113..b29c23e40 100644
--- a/B05_Profile/B05_Profile_UI_Structures_Panel.ts
+++ b/B05_Profile/B05_Profile_UI_Structures_Panel.ts
@@ -14,7 +14,6 @@
  * ========================================================================== */
 
 import {
-  structureAnchorM,
   type StructureInstance,
   type StructuresSectionOptions,
   type StructurePlacement,
@@ -48,6 +47,7 @@ import { pickable, showsAnchor } from "./B05_Profile_UI_Structures_Define";
 import { hiddenOptionKeys } from "./B05_Profile_UI_Structures_Define_Form";
 import { stationLabel as formatStation } from "../common_util/common_util_station";
 import { PIPE_MATCH_M, resolveSelection } from "../A00_Common/design/design_selection";
+import { movedStructure, snapDock, snapStructureStation } from "./B05_Profile_UI_Structures_Snap";
 
 /** 공개 타입·표시 상수는 700줄 제한으로 `_Structures_Panel_Types` 로 옮겼다 —
  *  옛 임포트 경로가 그대로 동작하도록 여기서 다시 내보낸다(2026-09-04). */
@@ -363,7 +363,7 @@ export function createStructuresSection(
     if (tempPipeChainage === null) return;
     const chainage = tempPipeChainage;
     tempPipeChainage = null;
-    if (selectedPipeChainage !== null && Math.abs(selectedPipeChainage - chainage) < 0.51) {
+    if (selectedPipeChainage !== null && Math.abs(selectedPipeChainage - chainage) < PIPE_MATCH_M) {
       selectedPipeChainage = null;
     }
     callbacks.onPipeRemove(chainage);
@@ -542,7 +542,13 @@ export function createStructuresSection(
   return {
     root,
     facility: { ...facilityOptions, recount: () => (facilityOptions.recount(), renderList()) }, // 단 수 → 목록 램프(54-15)
-    listRoot: list,
+    listRoot: snapDock(list, {
+      structures,
+      pipes: () => pipeFacilities,
+      emit,
+      movePipe: (from, to, attributes) => callbacks.onPipeUpdate(from, to, attributes),
+      closeForm: () => resetForm(),
+    }),
     hasSelection: () => editingId !== null || selectedPipeChainage !== null,
     pickGroups: () => pickGroups(types, canPick), // 우클릭 메뉴 = 이 드롭다운 목록(129-1)
     setTypes(next, pick = () => true) {
@@ -637,6 +643,7 @@ export function createStructuresSection(
       loadForm(structures.find((entry) => entry.structure_id === structureId) ?? null);
     },
     addAt(chainageM, typeId) {
+      chainageM = snapStructureStation(chainageM); // 정수 m · 일반 측점 붙기(234-1)
       const type = typeMap().get(typeId);
       if (!type) return;
       // 우클릭 = [추가]까지 끝난 상태(116-1 · 08-18 「즉시 추가 폐지」를 바꿈) — 새로 놓기에서
@@ -670,21 +677,8 @@ export function createStructuresSection(
     moveById(structureId, toChainageM) {
       const index = structures.findIndex((entry) => entry.structure_id === structureId);
       if (index < 0) return false;
-      const target = structures[index];
-      if (target.placement === "interval") {
-        // 구간은 길이를 유지한 채 통째로 옮긴다 — 기준점을 끌면 시작·종료가 따라온다.
-        const length = (target.end_m ?? 0) - (target.start_m ?? 0);
-        const anchorOffset = structureAnchorM(target) - (target.start_m ?? 0);
-        const start = toChainageM - anchorOffset;
-        structures[index] = {
-          ...target,
-          chainage_m: toChainageM,
-          start_m: start,
-          end_m: start + length,
-        };
-      } else {
-        structures[index] = { ...target, chainage_m: toChainageM };
-      }
+      // 구간은 길이를 유지한 채 통째로 — 기준 · 시작 · 끝 모두 정수 m(234-1)
+      structures[index] = movedStructure(structures[index], toChainageM);
       emit();
       return true;
     },
diff --git a/B05_Profile/B05_Profile_UI_Structures_Panel_Commit.ts b/B05_Profile/B05_Profile_UI_Structures_Panel_Commit.ts
index 5490be851..66e2b3966 100644
--- a/B05_Profile/B05_Profile_UI_Structures_Panel_Commit.ts
+++ b/B05_Profile/B05_Profile_UI_Structures_Panel_Commit.ts
@@ -22,6 +22,10 @@ import { readStructureSpec, specRenderedKeys } from "./B05_Profile_UI_Structures
 import { asRoad } from "./B05_Profile_UI_Structures_Define";
 import type { GroupBoxes } from "./B05_Profile_UI_Structures_Groups";
 import { STRUCTURE_SPECS } from "../A00_Common/design/design_structure_pipe";
+import {
+  isSnappedStation,
+  snapStructureStation,
+} from "../common_util/common_util_structure_station";
 import {
   readGroupItems,
   readSummaryItem,
@@ -32,6 +36,7 @@ import type {
   PipeFacilityItem,
   StructuresCallbacks,
 } from "./B05_Profile_UI_Structures_Panel_Types";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 
 /** 패널이 쥔 값 중 폼 왕복·저장에 필요한 것들. 이름은 분리 전 지역변수와 같다. */
 export interface StructuresCommitContext {
@@ -168,7 +173,7 @@ export function loadPipeForm(ctx: StructuresCommitContext, pipe: PipeFacilityIte
   // 관으로 본다(다른 곳의 관 매칭 기준과 동일).
   const isTemp =
     ctx.tempPipeChainage() !== null &&
-    Math.abs(pipe.chainage_m - (ctx.tempPipeChainage() as number)) < 0.51;
+    Math.abs(pipe.chainage_m - (ctx.tempPipeChainage() as number)) < PIPE_MATCH_M;
   if (isTemp) {
     ctx.setTempPipeChainage(pipe.chainage_m);
     ctx.setSelectedPipeChainage(pipe.chainage_m);
@@ -304,8 +309,11 @@ export async function commit(ctx: StructuresCommitContext, live = false): Promis
       beforeInput?.focus();
       return;
     }
-    start = Math.max(anchor - before, 0);
-    end = start + length;
+    // 시작 · 끝도 정수 m(234-1) — 안 고친 옛 소수 기준이면 옛 셈 그대로([정수 맞춤] 몫)
+    const fit = (value: number): number =>
+      isSnappedStation(anchor as number) ? snapStructureStation(value) : value;
+    start = fit(Math.max(anchor - before, 0));
+    end = Math.max(fit(start + length), start + Math.min(length, 1));
   } else if (placement === "interval") {
     start = ctx.startFields.read(step, true);
     end = ctx.endFields.read(step, true);
diff --git a/B05_Profile/B05_Profile_UI_Structures_Snap.ts b/B05_Profile/B05_Profile_UI_Structures_Snap.ts
new file mode 100644
index 000000000..3f29a57ac
--- /dev/null
+++ b/B05_Profile/B05_Profile_UI_Structures_Snap.ts
@@ -0,0 +1,160 @@
+/* =============================================================================
+ * B05_Profile_UI_Structures_Snap.ts
+ * 구조물 기준 측점 정수 맞춤(234-1) — 끌기 · 방향키로 옮기는 구조물 한 건의 모양과
+ * 기존 소수 자료를 옮기는 [정수 맞춤] 단추(좌측 구조물 목록 머리 · B05 · B06 한 벌).
+ *
+ * 맞춤 규칙은 공용 `common_util_structure_station`(파이썬 짝) 한 벌. 단추는 확인 창 뒤
+ * 구조물은 한 번에, 관은 하나씩 폼 수정과 같은 길(`onPipeUpdate`)로 옮긴다 — 계획고 편집
+ * 따라가기(213-2) · 시설 속성 이어받기가 손으로 옮길 때와 같다. 정본은 [저장]에서 나간다.
+ * ========================================================================== */
+
+import { showConfirmDialog, showToast } from "@ui/ui_template_elements";
+import {
+  isSnappedStation,
+  snapStructureStation,
+} from "../common_util/common_util_structure_station";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
+
+export { snapStructureStation };
+import { structureAnchorM, type StructureInstance } from "./B05_Profile_Api_Structures";
+import type { FacilityAttributes } from "./B05_Profile_UI_Drainage_Facility";
+import type { PipeFacilityItem } from "./B05_Profile_UI_Structures_Panel_Types";
+
+/** 구조물을 그 측점으로 옮긴 모양 — 구간은 기준과의 거리 · 길이를 지키되 시작 · 끝도 맞춤. */
+export function movedStructure(target: StructureInstance, toChainageM: number): StructureInstance {
+  const anchor = snapStructureStation(toChainageM);
+  if (target.placement !== "interval") return { ...target, chainage_m: anchor };
+  const length = (target.end_m ?? 0) - (target.start_m ?? 0);
+  const start = snapStructureStation(anchor - (structureAnchorM(target) - (target.start_m ?? 0)));
+  const snappedEnd = snapStructureStation(start + length);
+  const end = snappedEnd > start ? snappedEnd : start + length;
+  return {
+    ...target,
+    chainage_m: Math.min(Math.max(anchor, start), end),
+    start_m: start,
+    end_m: end,
+  };
+}
+
+/** 사라진 측점의 계획고 편집이 따라갈 새 측점 — 맞춘 자리(0.006m 안 · 213-2 와 같은 폭)의 것. */
+export function followSnapped<T extends { chainage_m: number }>(
+  station: T,
+  born: ReadonlyArray<T>,
+): T | null {
+  const to = snapStructureStation(station.chainage_m);
+  return born.find((next) => Math.abs(next.chainage_m - to) < 0.006) ?? null;
+}
+
+const offGrid = (value: number | null | undefined): boolean =>
+  typeof value === "number" && !isSnappedStation(value);
+
+/** 기준 · 시작 · 끝 중 하나라도 맞춤 밖(소수)인 구조물인가. */
+export const structureOffGrid = (structure: StructureInstance): boolean =>
+  offGrid(structure.chainage_m) || offGrid(structure.start_m) || offGrid(structure.end_m);
+
+export interface SnapPlan {
+  /** 목록 자리 · 옮긴 모양. */
+  structures: Array<{ index: number; next: StructureInstance }>;
+  pipes: Array<{ from: number; to: number; pipe: PipeFacilityItem }>;
+  /** 맞춘 자리에 다른 관이 있어 그대로 둔 관 수. */
+  skipped: number;
+}
+
+/** 옮길 것 셈 — 구조물은 옮긴 모양, 관은 (옛 자리 → 새 자리) · 자리 겹친 관은 건너뜀. */
+export function snapPlan(
+  structures: ReadonlyArray<StructureInstance>,
+  pipes: ReadonlyArray<PipeFacilityItem>,
+): SnapPlan {
+  const moved = structures.flatMap((structure, index) =>
+    structureOffGrid(structure)
+      ? [{ index, next: movedStructure(structure, structureAnchorM(structure)) }]
+      : [],
+  );
+  const taken = pipes.filter((pipe) => !offGrid(pipe.chainage_m)).map((pipe) => pipe.chainage_m);
+  const plan: SnapPlan = { structures: moved, pipes: [], skipped: 0 };
+  [...pipes]
+    .filter((pipe) => offGrid(pipe.chainage_m))
+    .sort((left, right) => left.chainage_m - right.chainage_m)
+    .forEach((pipe) => {
+      const to = snapStructureStation(pipe.chainage_m);
+      if (taken.some((other) => Math.abs(other - to) < PIPE_MATCH_M)) {
+        plan.skipped += 1;
+        return;
+      }
+      taken.push(to);
+      plan.pipes.push({ from: pipe.chainage_m, to, pipe });
+    });
+  return plan;
+}
+
+/** 관 한 건의 지금 속성 그대로 — 폼 [수정]과 같은 꼴(비운 칸 = 지움 규칙에 옛 값이 다 실림). */
+export const pipeAttributes = (pipe: PipeFacilityItem): FacilityAttributes => ({
+  facility: pipe.facility,
+  ...(pipe.start_m !== undefined ? { start_m: pipe.start_m } : {}),
+  ...(pipe.end_m !== undefined ? { end_m: pipe.end_m } : {}),
+  options: { ...(pipe.options ?? {}) },
+  summary_item: pipe.summary_item ?? null,
+  group_items: pipe.group_items ?? null,
+});
+
+export interface SnapDockContext {
+  /** 패널이 쥔 구조물 배열(참조) — 옮긴 것을 제자리에 갈아 끼움. */
+  structures: StructureInstance[];
+  pipes: () => ReadonlyArray<PipeFacilityItem>;
+  /** 목록이 바뀜 알림(한 번). */
+  emit: () => void;
+  /** 관 한 건 옮김 — 폼 [수정]과 같은 길. */
+  movePipe: (from: number, to: number, attributes: FacilityAttributes) => void;
+  /** 열린 폼을 닫음 — 옛 측점을 쥔 폼이 다음 [수정]에 되돌리지 않게. */
+  closeForm: () => void;
+}
+
+/** [정수 맞춤] 단추를 얹은 목록 뿌리 — 아래 고정 영역에 목록 대신 놓인다. */
+export function snapDock(list: HTMLElement, ctx: SnapDockContext): HTMLElement {
+  const button = document.createElement("button");
+  button.type = "button";
+  button.className = "b05-route__irregular-btn b05-structure__snap";
+  button.textContent = "정수 맞춤";
+  button.title = "소수 기준 측점(관 · 구조물)을 정수 m 로 — 일반 측점 1 m 안이면 그 측점";
+  button.addEventListener("click", () => void runSnap(ctx));
+  const head = document.createElement("div");
+  head.className = "b05-structure__snap-row";
+  head.append(button);
+  const dock = document.createElement("div");
+  dock.className = "b05-structure__list-dock";
+  dock.append(head, list);
+  return dock;
+}
+
+export async function runSnap(ctx: SnapDockContext): Promise<number> {
+  const plan = snapPlan(ctx.structures, ctx.pipes());
+  const count = plan.structures.length + plan.pipes.length;
+  if (!count) {
+    showToast(
+      plan.skipped
+        ? `소수 측점 관 ${plan.skipped}건은 맞출 자리에 다른 관이 있어 그대로 둡니다.`
+        : "소수 기준 측점이 없습니다.",
+      "info",
+    );
+    return 0;
+  }
+  const ok = await showConfirmDialog(
+    `소수 기준 측점 ${count}건(관 ${plan.pipes.length} · 구조물 ${plan.structures.length})을 ` +
+      "정수 m(일반 측점 1 m 안이면 그 측점)로 옮깁니다. 계획고 편집도 따라가며, [저장]을 눌러야 남습니다.",
+    "정수 맞춤",
+  );
+  if (!ok) return 0;
+  ctx.closeForm();
+  if (plan.structures.length) {
+    plan.structures.forEach(({ index, next }) => (ctx.structures[index] = next));
+    ctx.emit();
+  }
+  plan.pipes.forEach(({ from, to, pipe }) => ctx.movePipe(from, to, pipeAttributes(pipe)));
+  showToast(
+    `정수 맞춤 ${count}건` +
+      (plan.skipped ? ` · 자리 겹친 관 ${plan.skipped}건은 그대로` : "") +
+      " — [저장]을 눌러 남기세요.",
+    "success",
+  );
+  return count;
+}
diff --git a/B05_Profile/B05_Profile_UI_Style_Structures.css b/B05_Profile/B05_Profile_UI_Style_Structures.css
index ed8512694..846d3623c 100644
--- a/B05_Profile/B05_Profile_UI_Style_Structures.css
+++ b/B05_Profile/B05_Profile_UI_Style_Structures.css
@@ -650,3 +650,15 @@
 .b05-structure__widening [aria-pressed="false"] .b05-structure__widening-area {
   color: var(--color-text-secondary);
 }
+
+/* [정수 맞춤] 단추 줄 — 구조물 목록 머리(234-1) */
+.b05-structure__snap-row {
+  display: flex;
+  justify-content: flex-end;
+  margin-bottom: var(--spacing-4);
+}
+
+.b05-structure__snap {
+  flex: 0 0 auto;
+  padding: var(--spacing-4) var(--spacing-8);
+}
diff --git a/B06_Section/B06_Section_Section_Store.ts b/B06_Section/B06_Section_Section_Store.ts
index 85fd95747..d194c8c29 100644
--- a/B06_Section/B06_Section_Section_Store.ts
+++ b/B06_Section/B06_Section_Section_Store.ts
@@ -39,6 +39,7 @@ import {
   pavementSpecsFrom,
   type PavementStructureInput,
 } from "@util/common_util_structure_pavement";
+import { setGeneralStations } from "../common_util/common_util_structure_station";
 import { applyStructureAreaRows, structureAreaRows } from "./B06_Section_Structure_Layouts";
 import type { CrossSectionPatch, SectionDetailResponse } from "./B06_Section_Api_Fetch";
 import { fetchSectionDetail, saveSections } from "./B06_Section_Api_Fetch";
@@ -63,6 +64,7 @@ async function withDraftWalls(
   detail: SectionDetailResponse,
   projectId: string,
 ): Promise<SectionDetailResponse> {
+  setGeneralStations(detail.longitudinal?.stations); // 구조물 기준 측점이 붙을 일반 측점(234-1)
   const drafts = readPendingStructures(projectId);
   // ⚠ **빈 목록도 「초안 없음」이다**(2026-09-09). 예전에는 `[]` 가 「초안이 있는데 벽이
   // 하나도 없다」로 읽혀 **아래에서 서버 저장분을 통째로 지웠다** — 구조물을 놓아도
@@ -214,6 +216,7 @@ export function replaceSectionDetail(
 ): void {
   cache.set(keyOf(projectId, routeId), detail);
   writeState("section-detail", detail, projectId, routeId);
+  setGeneralStations(detail.longitudinal?.stations);
 }
 
 /**
diff --git a/B06_Section/B06_Section_UI_Page_Structures_Panel.ts b/B06_Section/B06_Section_UI_Page_Structures_Panel.ts
index fc0d5a3ae..29bca82ca 100644
--- a/B06_Section/B06_Section_UI_Page_Structures_Panel.ts
+++ b/B06_Section/B06_Section_UI_Page_Structures_Panel.ts
@@ -48,6 +48,7 @@ import {
   type DesignSelection,
 } from "../A00_Common/design/design_selection";
 import { showToast } from "@ui/ui_template_elements";
+import { snapStructureStation } from "../common_util/common_util_structure_station";
 import {
   adjustDockRoot,
   refreshAdjustSlots,
@@ -239,7 +240,7 @@ export function createB06StructuresPanel(deps: B06StructuresPanelDeps): B06Struc
           showToast(PIPE_ADD_GUIDE, "error");
           return;
         }
-        const at = Number(chainageM.toFixed(2));
+        const at = snapStructureStation(chainageM); // 관 기준 측점 = 정수 m(234-1)
         if (pipeFacilities.some((entry) => Math.abs(entry.chainage_m - at) < PIPE_MATCH_M)) {
           showToast("그 자리에는 계곡 통과 시설이 이미 있습니다.", "error");
           return;
@@ -263,11 +264,8 @@ export function createB06StructuresPanel(deps: B06StructuresPanelDeps): B06Struc
       // 값 수정·기준점 이동 모두 B06 에서 받는다 — 이동은 종단 끌기와 **같은 함수**를 탄다
       // (2026-09-12 일원화). 재분할은 [저장]·[확정] 뒤 서버 몫이다.
       onPipeUpdate: (fromChainageM, toChainageM, attributes) => {
-        // 위치가 "옮겨졌다"고 볼 기준은 관 매칭과 같은 0.51m다 — 폼의 측점 표기는
-        // 0.1m로 반올림되므로 0.005m 기준으로 보면 값만 고쳐도 이동으로 잡힌다
-        // (2026-08-29 사용자 보고: 높이만 바꿨는데 이동 안내가 떴다).
-        if (Math.abs(fromChainageM - toChainageM) > PIPE_MATCH_M)
-          movePipeTo(fromChainageM, toChainageM);
+        // 값만 고치면 폼이 옛 측점을 그대로 돌려줌(안 고친 칸) — 0.005m 넘으면 옮긴 것(80.17 → 80 도 · 234-1)
+        if (Math.abs(fromChainageM - toChainageM) > 0.005) movePipeTo(fromChainageM, toChainageM);
         if (attributes.summary_item !== undefined || attributes.group_items !== undefined) {
           // 옮긴 뒤 자리(toChainageM)에서 찾는다 — 안 옮겼으면 from 과 0.51m 안이라 같은 관이다.
           const mine = pipeFacilities.find(
@@ -480,7 +478,7 @@ export function createB06StructuresPanel(deps: B06StructuresPanelDeps): B06Struc
       showToast(PIPE_MOVE_GUIDE, "error");
       return;
     }
-    const to = Number(toChainageM.toFixed(2));
+    const to = snapStructureStation(toChainageM); // 정수 m · 일반 측점 붙기(234-1)
     const hit = pipeFacilities.find(
       (entry) => Math.abs(entry.chainage_m - fromChainageM) < PIPE_MATCH_M,
     );
diff --git a/B06_Section/B06_Section_UI_Section_View_Menu.ts b/B06_Section/B06_Section_UI_Section_View_Menu.ts
index cfddee991..36f17d038 100644
--- a/B06_Section/B06_Section_UI_Section_View_Menu.ts
+++ b/B06_Section/B06_Section_UI_Section_View_Menu.ts
@@ -15,6 +15,7 @@ import { structureAnchorM } from "../B05_Profile/B05_Profile_Api_Structures";
 import type { IrregularStation } from "../B05_Profile/B05_Profile_UI_IrregularStations";
 import { mountStructureMenu } from "../B05_Profile/B05_Profile_UI_Profile_Structures";
 import { pickGroups } from "../B05_Profile/B05_Profile_UI_Structures_Panel_Types";
+import { PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 
 /** 종단 그래프에서 구조물을 넣고 빼는 길 — 페이지가 물려 준다. 없으면 메뉴를 안 붙인다. */
 export interface SectionStructureEdit {
@@ -57,7 +58,7 @@ export function moveMarkById(
   if (!station) return;
   // 측점선 id 로 온 경우 — 그 측점 자리에 선 구조물을 찾는다(관 매칭과 같은 0.51m).
   const near = input.structures.find(
-    (entry) => Math.abs(structureAnchorM(entry) - station.chainage_m) < 0.51,
+    (entry) => Math.abs(structureAnchorM(entry) - station.chainage_m) < PIPE_MATCH_M,
   );
   if (near) moveStructureMark(input.structures, input.edit, String(near.structure_id), toChainageM);
 }
diff --git a/B06_Section/B06_Section_UI_Section_View_Profile.ts b/B06_Section/B06_Section_UI_Section_View_Profile.ts
index 0df0e0f12..3cac3c62d 100644
--- a/B06_Section/B06_Section_UI_Section_View_Profile.ts
+++ b/B06_Section/B06_Section_UI_Section_View_Profile.ts
@@ -15,7 +15,7 @@ import {
   type DesignPageShared,
 } from "../A00_Common/design/design_shared";
 import { readState } from "../A00_Common/b_page_state";
-import { coversChainage } from "../A00_Common/design/design_selection";
+import { coversChainage, PIPE_MATCH_M } from "../A00_Common/design/design_selection";
 import { fetchLatestRoute, type RouteLatestResponse } from "../B05_Profile/B05_Profile_Api_Fetch";
 import type {
   CrossSection,
@@ -40,7 +40,7 @@ import {
 } from "./B06_Section_UI_Section_View_Menu";
 
 /** 관 · 측점을 같은 자리로 보는 거리(m) — 계획서 24-1 `PIPE_MATCH_M` 과 같은 값. */
-const MATCH_M = 0.51;
+const MATCH_M = PIPE_MATCH_M;
 /** 종단 우클릭의 옛 자유 텍스트 구조물 → 레지스트리 타입(종단 보기와 같은 매핑). */
 const LEGACY_TYPE_IDS: Record<string, string> = {
   기성막이: "revetment",
diff --git a/common_util/common_util_drainage_detail.py b/common_util/common_util_drainage_detail.py
index 8e2a2f40b..7ae990503 100644
--- a/common_util/common_util_drainage_detail.py
+++ b/common_util/common_util_drainage_detail.py
@@ -47,6 +47,7 @@ from common_util.common_util_route_geometry import (
     interpolate_vertex,
     is_uphill_at,
 )
+from common_util.common_util_structure_station import snap_candidates
 from common_util.common_util_wamis_rainfall import idf_intensity
 from config.config_system import (
     DRAINAGE_BOX_THRESHOLD_MM,
@@ -198,7 +199,8 @@ def build_detail(
             )
             for pipe in routing.base_pipes
         ]
-        pipes = place_pipes(vertices, base, routing.strength_curve)
+        # 자동 관 자리 = 정수 m · 일반 측점 1 m 안이면 그 측점(234-1) — 확정본(위)은 단추로만
+        pipes = snap_candidates(place_pipes(vertices, base, routing.strength_curve), vertices)
 
     detail = DrainageDetail(
         route_lonlat=routing.route_lonlat,
diff --git a/common_util/common_util_drainage_pipes.py b/common_util/common_util_drainage_pipes.py
index 2a3c67f3e..1b8454b1c 100644
--- a/common_util/common_util_drainage_pipes.py
+++ b/common_util/common_util_drainage_pipes.py
@@ -35,6 +35,10 @@ from shapely.geometry import LineString, Point
 from B04_PreProcess.B04_PreProcess_Engine_Watershed_Export import drainage_dir
 from common_util.common_util_json import atomic_write_json
 from common_util.common_util_route_geometry import RouteVertex, interpolate_vertex
+from common_util.common_util_structure_station import (
+    route_general_stations,
+    snap_structure_station,
+)
 from common_util.common_util_summary_item import parse_group_items, parse_summary_item
 from config.config_system import (
     DRAINAGE_CACHE_DIRNAME,
@@ -216,10 +220,12 @@ def project_pipe_points(points: list[PipePoint], vertices: list[RouteVertex]) ->
     line = LineString([(vertex.x, vertex.y) for vertex in vertices])
     if line.length <= 0:
         return points
+    # 새 노선 위 자리도 정수 m · 일반 측점 1 m 안이면 그 측점(234-1) — 시설 속성은 관과 함께 옮겨 감
+    stations = route_general_stations(vertices[-1].chainage_m)
     for point in points:
         if point.x is None or point.y is None:
             continue
-        moved = float(line.project(Point(point.x, point.y)))
+        moved = snap_structure_station(float(line.project(Point(point.x, point.y))), stations)
         shift = moved - float(point.chainage_m)
         point.chainage_m = moved
         if point.start_m is not None:
diff --git a/common_util/common_util_structure_station.py b/common_util/common_util_structure_station.py
new file mode 100644
index 000000000..79eb2cdd3
--- /dev/null
+++ b/common_util/common_util_structure_station.py
@@ -0,0 +1,80 @@
+"""구조물 · 관 기준 측점 = 정수 m · 일반 측점 1 m 안이면 그 측점에 붙음(234-1).
+
+TS 짝 = `common_util/common_util_structure_station.ts`(화면 입력 · 끌기 · 방향키 · 정수 맞춤 단추).
+거울 시험 = `resources/tester/test_234_1_structure_station.py`.
+일반 측점 = 격자(간격) · 시종점 — 서버 자동 배치 · 노선 재투영이 쓴다.
+"""
+
+from __future__ import annotations
+
+import math
+from collections.abc import Sequence
+from dataclasses import replace
+from typing import TypeVar
+
+from common_util.common_util_route_geometry import RouteVertex, interpolate_vertex
+from config.config_system_design import SECTION_STATION_INTERVAL_M
+
+_Candidate = TypeVar("_Candidate")
+
+# 일반 측점에 붙는 폭(m) — 이 안이면 그 측점 값(끝 측점처럼 정수가 아니어도).
+GENERAL_SNAP_M = 1.0
+_EPS = 1e-6
+
+
+def general_stations(total_m: float, interval_m: float) -> list[float]:
+    """격자 측점 + 끝 측점(`Sections_Core._chainages` 와 같은 줄)."""
+    if not (total_m > 0 and interval_m > 0):
+        return [0.0]
+    values = [index * interval_m for index in range(int(total_m // interval_m) + 1)]
+    if total_m - values[-1] > _EPS:
+        values.append(float(total_m))
+    return values
+
+
+def _near_general(value: float, stations: Sequence[float]) -> float | None:
+    best: float | None = None
+    for station in stations:
+        gap = abs(station - value)
+        if gap < GENERAL_SNAP_M - _EPS and (best is None or gap < abs(best - value)):
+            best = float(station)
+    return best
+
+
+def snap_structure_station(chainage_m: float, stations: Sequence[float]) -> float:
+    """기준 측점 맞춤 — 일반 측점 1 m 안이면 그 측점 · 아니면 정수 m(.5 는 올림) · 정수가 일반
+    측점 1 m 안이면 그 측점. 두 번 맞춰도 같다."""
+    value = float(chainage_m)
+    if not math.isfinite(value):
+        return value
+    direct = _near_general(value, stations)
+    if direct is not None:
+        return direct
+    whole = float(math.floor(value + 0.5))
+    near = _near_general(whole, stations)
+    return whole if near is None else near
+
+
+def route_general_stations(total_m: float) -> list[float]:
+    """노선 길이의 일반 측점 — 서버 측점 간격(`SECTION_STATION_INTERVAL_M`)."""
+    return general_stations(total_m, SECTION_STATION_INTERVAL_M)
+
+
+def snap_candidates(
+    candidates: Sequence[_Candidate], vertices: Sequence[RouteVertex]
+) -> list[_Candidate]:
+    """자동 배치 관 자리 맞춤 — 좌표는 맞춘 자리로 다시 찍고, 같은 자리로 모이면 앞선 것만.
+
+    `candidates` 는 `chainage_m · x · y` 를 가진 dataclass(`StructureCandidate`)."""
+    total_m = float(vertices[-1].chainage_m)
+    stations = route_general_stations(total_m)
+    snapped: list[_Candidate] = []
+    taken: set[float] = set()
+    for candidate in candidates:
+        at = min(snap_structure_station(candidate.chainage_m, stations), total_m)
+        if at in taken:
+            continue
+        taken.add(at)
+        x, y, _ = interpolate_vertex(list(vertices), at)
+        snapped.append(replace(candidate, chainage_m=at, x=x, y=y))
+    return snapped
diff --git a/common_util/common_util_structure_station.ts b/common_util/common_util_structure_station.ts
new file mode 100644
index 000000000..4c5cc21d2
--- /dev/null
+++ b/common_util/common_util_structure_station.ts
@@ -0,0 +1,69 @@
+/* =============================================================================
+ * common_util/common_util_structure_station.ts
+ * 구조물 · 관 기준 측점 = 정수 m · 일반 측점 1 m 안이면 그 측점에 붙음(234-1).
+ *
+ * 파이썬 짝 = `common_util/common_util_structure_station.py`(서버 자동 배치 · 노선 재투영).
+ * 거울 시험 = `resources/tester/test_234_1_structure_station.py`.
+ * 일반 측점 = 격자 · 시종점(구조물 측점 kind "irregular" 은 뺌) — 상세를 읽을 때 한 번 둔다.
+ * ========================================================================== */
+
+/** 일반 측점에 붙는 폭(m) — 이 안이면 그 측점 값(끝 측점처럼 정수가 아니어도). */
+export const GENERAL_SNAP_M = 1;
+const EPS = 1e-6;
+
+let general: number[] = [];
+
+/** 일반 측점 목록을 둔다 — 횡단 상세를 읽을 때마다(B05 · B06 한 노선). */
+export function setGeneralStations(
+  stations: ReadonlyArray<{ chainage_m: number; kind?: string }> | null | undefined,
+): void {
+  general = (stations ?? [])
+    .filter((station) => station.kind !== "irregular")
+    .map((station) => station.chainage_m);
+}
+
+export const generalStations = (): readonly number[] => general;
+
+function nearGeneral(value: number, stations: readonly number[]): number | null {
+  let best: number | null = null;
+  for (const station of stations) {
+    const gap = Math.abs(station - value);
+    if (gap < GENERAL_SNAP_M - EPS && (best === null || gap < Math.abs(best - value)))
+      best = station;
+  }
+  return best;
+}
+
+/** 기준 측점 맞춤 — 일반 측점 1 m 안이면 그 측점 · 아니면 정수 m(.5 는 올림) · 정수가 일반 측점
+ *  1 m 안이면 그 측점(끝 119.8 옆 119 → 119.8). 두 번 맞춰도 같다. */
+export function snapStructureStation(
+  chainageM: number,
+  stations: readonly number[] = general,
+): number {
+  if (!Number.isFinite(chainageM)) return chainageM;
+  const direct = nearGeneral(chainageM, stations);
+  if (direct !== null) return direct;
+  const whole = Math.floor(chainageM + 0.5);
+  return nearGeneral(whole, stations) ?? whole;
+}
+
+/** 방향키 한 걸음(1 m) — 붙기가 제자리로 되돌리면 한 걸음 더(끝 119.8 → 118). 노선 밖이면 제자리. */
+export function stepStructureStation(
+  fromM: number,
+  direction: 1 | -1,
+  stations: readonly number[] = general,
+): number {
+  const end = stations.length ? Math.max(...stations) : Infinity;
+  for (let steps = 1; steps <= 3; steps += 1) {
+    const next = snapStructureStation(fromM + direction * steps, stations);
+    if (next < 0 || next > end + EPS) return fromM;
+    if ((next - fromM) * direction > EPS) return next;
+  }
+  return fromM;
+}
+
+/** 이미 맞춘 값인가(정수 맞춤 단추가 옮길 것을 가름). */
+export const isSnappedStation = (
+  chainageM: number,
+  stations: readonly number[] = general,
+): boolean => Math.abs(snapStructureStation(chainageM, stations) - chainageM) < EPS;
diff --git a/resources/tester/helper_165_pavement_flow.cjs b/resources/tester/helper_165_pavement_flow.cjs
index 209ea2d1f..f9fc900b3 100644
--- a/resources/tester/helper_165_pavement_flow.cjs
+++ b/resources/tester/helper_165_pavement_flow.cjs
@@ -148,6 +148,10 @@ const panelModule = loadTs(
     "../B05_Profile/B05_Profile_UI_Structure_Pick_Session": { readStructurePick: () => null },
     "../A00_Common/design/design_selection": selection,
     "@ui/ui_template_elements": { showToast() {} },
+    // 관 기준 측점 정수 맞춤(234-1) — 일반 측점 없으면 정수 m 만
+    "../common_util/common_util_structure_station": {
+      snapStructureStation: (value) => Math.floor(value + 0.5),
+    },
     "./B06_Section_UI_Adjust_Dock": {
       adjustDockRoot: () => ({}),
       refreshAdjustSlots() {},
diff --git a/resources/tester/helper_231_1_pave_reload.cjs b/resources/tester/helper_231_1_pave_reload.cjs
index 24d17d3e8..0f8153e01 100644
--- a/resources/tester/helper_231_1_pave_reload.cjs
+++ b/resources/tester/helper_231_1_pave_reload.cjs
@@ -167,6 +167,10 @@ const panelModule = loadTs(
     "../B05_Profile/B05_Profile_UI_Structure_Pick_Session": pickSession,
     "../A00_Common/design/design_selection": selection,
     "@ui/ui_template_elements": { showToast() {} },
+    // 관 기준 측점 정수 맞춤(234-1) — 일반 측점 없으면 정수 m 만
+    "../common_util/common_util_structure_station": {
+      snapStructureStation: (value) => Math.floor(value + 0.5),
+    },
     "./B06_Section_UI_Adjust_Dock": {
       adjustDockRoot: () => ({}),
       refreshAdjustSlots() {},
diff --git a/resources/tester/helper_234_1_structure_station.cjs b/resources/tester/helper_234_1_structure_station.cjs
new file mode 100644
index 000000000..e6717ba84
--- /dev/null
+++ b/resources/tester/helper_234_1_structure_station.cjs
@@ -0,0 +1,192 @@
+/* 234-1 구조물 기준 측점 = 정수 m · 일반 측점 붙기 · [정수 맞춤].
+ * 진짜 `common_util_structure_station` · `_Structures_Snap` · `_Structures_Fields` · `_Drainage_Pipes` ·
+ * `followedStation` 을 Node 로 돌림. 입력은 argv[2] JSON(파이썬과 같은 값) · 표준출력 JSON 한 벌.
+ */
+const fs = require("fs");
+const path = require("path");
+const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));
+
+const ROOT = path.join(__dirname, "..", "..");
+
+function loadTs(file, stubs = {}) {
+  const js = ts.transpileModule(fs.readFileSync(path.join(ROOT, file), "utf8"), {
+    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
+  }).outputText;
+  const box = { exports: {} };
+  const localRequire = (request) => {
+    if (stubs[request]) return stubs[request];
+    throw new Error(`stub 없음: ${request} (${file})`);
+  };
+  new Function("exports", "module", "require", js)(box.exports, box, localRequire);
+  return box.exports;
+}
+
+/* 가짜 DOM — 폼 칸(input · label · span)만. */
+function fakeElement(tag) {
+  const listeners = {};
+  const classes = new Set();
+  return {
+    tagName: tag,
+    value: "",
+    className: "",
+    style: {},
+    children: [],
+    classList: {
+      toggle: (name, on) => (on ? classes.add(name) : classes.delete(name)),
+      add: (name) => classes.add(name),
+      remove: (name) => classes.delete(name),
+      contains: (name) => classes.has(name),
+    },
+    append(...nodes) {
+      this.children.push(...nodes);
+    },
+    addEventListener(type, fn) {
+      (listeners[type] ??= []).push(fn);
+    },
+    fire(type) {
+      (listeners[type] ?? []).forEach((fn) => fn({ type }));
+    },
+    focus() {},
+  };
+}
+global.document = { createElement: fakeElement };
+
+const input = JSON.parse(fs.readFileSync(process.argv[2], "utf8"));
+const station = loadTs("common_util/common_util_structure_station.ts");
+const STATIONS = input.stations;
+const out = {};
+
+// ① 맞춤 · 걸음 — 파이썬과 같은 값(거울)
+out.snap = input.samples.map((value) => station.snapStructureStation(value, STATIONS));
+out.step = input.steps.map(([from, dir]) => station.stepStructureStation(from, dir, STATIONS));
+out.snapTwice = input.samples.every(
+  (value) =>
+    station.snapStructureStation(station.snapStructureStation(value, STATIONS), STATIONS) ===
+    station.snapStructureStation(value, STATIONS),
+);
+
+// 일반 측점 등록 — 구조물 측점(irregular)은 뺌 · 등록값이 기본으로 쓰임
+station.setGeneralStations(
+  STATIONS.map((value) => ({ chainage_m: value, kind: "regular" })).concat([
+    { chainage_m: 80.17, kind: "irregular" },
+  ]),
+);
+out.general = [...station.generalStations()];
+out.defaultSnap = station.snapStructureStation(80.4);
+
+// ② 좌측 폼 칸 — 친 값 80.17 → 80 · 안 고친 옛 값은 그대로
+const fields = loadTs("B05_Profile/B05_Profile_UI_Structures_Fields.ts", {
+  "./B05_Profile_Util_Station": loadTs("B05_Profile/B05_Profile_Util_Station.ts"),
+  "../B06_Section/B06_Section_UI_Cross_Culvert_Basin": { DEFAULT_BASIN_SHAPE: {} },
+  "../common_util/common_util_culvert_sets": { fillPipeHeights: () => {} },
+  "../common_util/common_util_structure_station": station,
+});
+const anchor = fields.stationFields("기준 측점", () => 20);
+out.remainderStep = anchor.remainder.step;
+anchor.station.value = "4";
+anchor.remainder.value = "0.17";
+out.typed = anchor.read(20, true);
+anchor.remainder.value = "0.6";
+out.typedNear = anchor.read(20, true);
+anchor.remainder.value = "1";
+out.typedOne = anchor.read(20, true);
+anchor.write(80.17, 20);
+out.untouched = anchor.read(20, true);
+
+// ③ 구조물 옮김 · [정수 맞춤] 셈 · 단추
+const toasts = [];
+let confirmText = null;
+const snap = loadTs("B05_Profile/B05_Profile_UI_Structures_Snap.ts", {
+  "@ui/ui_template_elements": {
+    showToast: (message, kind) => toasts.push({ message, kind }),
+    showConfirmDialog: async (message) => ((confirmText = message), true),
+  },
+  "../common_util/common_util_structure_station": station,
+  "../A00_Common/design/design_selection": { PIPE_MATCH_M: 0.51 },
+  "./B05_Profile_Api_Structures": {
+    structureAnchorM: (entry) => entry.chainage_m ?? entry.start_m ?? 0,
+  },
+});
+out.movedPoint = snap.movedStructure({ placement: "point", chainage_m: 127.86 }, 127.86);
+out.movedWall = snap.movedStructure(
+  { placement: "interval", chainage_m: 80.17, start_m: 75.17, end_m: 95.67 },
+  80.17,
+);
+out.movedDrag = snap.movedStructure(
+  { placement: "interval", chainage_m: 50, start_m: 50, end_m: 62 },
+  133.4,
+);
+
+const structures = input.structures.map((entry) => ({ ...entry }));
+const pipes = input.pipes.map((chainage_m) => ({
+  chainage_m,
+  facility: "pipe",
+  options: { pipe_kind: "흄관" },
+  summary_item: null,
+  group_items: null,
+}));
+const plan = snap.snapPlan(structures, pipes);
+out.plan = {
+  structures: plan.structures.map(({ index, next }) => ({ index, next })),
+  pipes: plan.pipes.map(({ from, to }) => [from, to]),
+  skipped: plan.skipped,
+};
+const moves = [];
+let emits = 0;
+let closed = 0;
+snap
+  .runSnap({
+    structures,
+    pipes: () => pipes,
+    emit: () => (emits += 1),
+    movePipe: (from, to, attributes) => moves.push({ from, to, attributes }),
+    closeForm: () => (closed += 1),
+  })
+  .then(async (count) => {
+    out.run = { count, emits, closed, moves, structures, confirmText, toasts: [...toasts] };
+    // 두 번째 누름 = 옮길 것 없음(관은 위 moves 로 옮겨졌다고 보고 목록을 맞춤)
+    moves.forEach(({ from, to }) => {
+      const hit = pipes.find((pipe) => pipe.chainage_m === from);
+      if (hit) hit.chainage_m = to;
+    });
+    toasts.length = 0;
+    const again = { structures, pipes: () => pipes, emit() {}, movePipe() {}, closeForm() {} };
+    out.second = { count: await snap.runSnap(again), toasts: [...toasts] };
+
+    // ④ 계획고 편집 따라감 — 한꺼번에 여럿 옮김(사라진 둘 · 새 둘)
+    const alignment = loadTs("B05_Profile/B05_Profile_UI_Profile_Alignment.ts");
+    const gone = [
+      { id: "pipe-80.17", chainage_m: 80.17 },
+      { id: "pipe-263.31", chainage_m: 263.31 },
+    ];
+    const born = [
+      { id: "pipe-80.00", chainage_m: 80 },
+      { id: "pipe-263.00", chainage_m: 263 },
+    ];
+    out.follow = gone.map((entry) => {
+      const old = alignment.followedStation(entry, gone, born);
+      const next = old ?? snap.followSnapped(entry, born);
+      return { old: old?.chainage_m ?? null, next: next?.chainage_m ?? null };
+    });
+
+    // ⑤ 배수유역도 관 지점 — 옮김 · 우클릭 추가 = 정수 m
+    const pipesEditor = loadTs("B05_Profile/B05_Profile_UI_Drainage_Pipes.ts", {
+      "@ui/ui_template_palette": { themeColor: () => "#000" },
+      "../common_util/common_util_structure_station": station,
+    });
+    const editor = pipesEditor.createPipeEditor(() => {});
+    editor.setContext(null, [
+      { x: 0, y: 0, chainage_m: 0 },
+      { x: 300, y: 0, chainage_m: 300 },
+    ]);
+    editor.setPipes([{ chainage_m: 80.17, reason: "stream" }]);
+    editor.moveTo(0, 141.37);
+    editor.addAtChainage(200.6);
+    out.editor = editor.pipes().map((pipe) => pipe.chainage_m);
+
+    process.stdout.write(JSON.stringify(out));
+  })
+  .catch((error) => {
+    process.stderr.write(String(error && error.stack ? error.stack : error));
+    process.exit(1);
+  });
diff --git a/resources/tester/helper_b05_drainage_report.cjs b/resources/tester/helper_b05_drainage_report.cjs
index 402b32bba..c8aac2cfa 100644
--- a/resources/tester/helper_b05_drainage_report.cjs
+++ b/resources/tester/helper_b05_drainage_report.cjs
@@ -8,23 +8,24 @@ const js = ts.transpileModule(fs.readFileSync(file, "utf8"), {
   compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
 }).outputText;
 const box = { exports: {} };
-new Function("exports", "module", "require", js)(box.exports, box, require);
+// 찾는 폭 한 값(234-1 · `PIPE_MATCH_M`) — 세션 저장소까지 끌고 오지 않게 값만 줌
+const localRequire = (request) =>
+  request === "../A00_Common/design/design_selection" ? { PIPE_MATCH_M: 0.51 } : require(request);
+new Function("exports", "module", "require", js)(box.exports, box, localRequire);
 const { buildPipeReports } = box.exports;
 
 const store = {
   get: (chainage) =>
-    chainage === 100.5 ? { facility: "box_culvert", start_m: 95, end_m: 106, options: { h: 2 } } : null,
+    chainage === 100.5
+      ? { facility: "box_culvert", start_m: 95, end_m: 106, options: { h: 2 } }
+      : null,
 };
 const basins = [
   { chainage_m: 40, pipe_diameter_mm: 800, design_flow_m3s: 1.2, bridge_required: false },
   { chainage_m: 100.5, pipe_diameter_mm: 1000, design_flow_m3s: 3.4, bridge_required: true },
 ];
 const out = buildPipeReports(
-  [
-    { chainage_m: 40.004, reason: "auto" },
-    { chainage_m: 100.499 },
-    { chainage_m: 200 },
-  ],
+  [{ chainage_m: 40.004, reason: "auto" }, { chainage_m: 100.499 }, { chainage_m: 200 }],
   basins,
   store,
 );
diff --git a/resources/tester/test_219_1_arrow_owner.py b/resources/tester/test_219_1_arrow_owner.py
index f9884020d..cd6ae78f9 100644
--- a/resources/tester/test_219_1_arrow_owner.py
+++ b/resources/tester/test_219_1_arrow_owner.py
@@ -63,9 +63,10 @@ def test_횡단_카드를_누른_뒤_좌우키는_관을_안_옮김(out) -> None
 
 @needs_node
 def test_종단도를_누른_뒤_좌우키는_지금처럼_이동(out) -> None:
-    assert out["profileThenArrows"]["move"] == [[263.21, 263.31]]
-    assert out["popoutThenArrows"]["move"] == [[263.21, 263.11]]  # 새 창 종단도도
-    assert out["chuteThenProfile"]["move"] == [[263.21, 263.31]]
+    # 좌우 한 걸음 = 1 m · 정수 m(234-1 · 옛 0.1 m)
+    assert out["profileThenArrows"]["move"] == [[263.21, 264]]
+    assert out["popoutThenArrows"]["move"] == [[263.21, 262]]  # 새 창 종단도도
+    assert out["chuteThenProfile"]["move"] == [[263.21, 264]]
 
 
 @needs_node
diff --git a/resources/tester/test_234_1_structure_station.py b/resources/tester/test_234_1_structure_station.py
new file mode 100644
index 000000000..885ec58af
--- /dev/null
+++ b/resources/tester/test_234_1_structure_station.py
@@ -0,0 +1,231 @@
+# -*- coding: utf-8 -*-
+"""234-1 구조물 · 관 기준 측점 = 정수 m · 일반 측점 1 m 안 붙기 · [정수 맞춤] 단추.
+
+9-29 「저장값 소수 · 표기만 정수」(20장)를 「저장값도 정수 m」로 바꿈
+(사용자 확정 10-10 · 조사 AF 7절 A+B+C).
+맞춤 규칙 한 벌 = 파이썬 `common_util_structure_station.py` ↔
+TS `common_util_structure_station.ts`(거울).
+화면 쪽 진짜 TS(폼 칸 · 구조물 옮김 · 단추 · 배수유역도 관 · 계획고 편집 따라감)는
+`helper_234_1_structure_station.cjs` 가 Node 로 돌린다. 서버 자동 배치 · 노선 재투영은 파이썬으로.
+"""
+
+from __future__ import annotations
+
+import json
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+HERE = Path(__file__).resolve().parent
+ROOT = HERE.parents[1]
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))
+
+from common_util.common_util_drainage_pipes import PipePoint, project_pipe_points  # noqa: E402
+from common_util.common_util_route_geometry import RouteVertex, StructureCandidate  # noqa: E402
+from common_util.common_util_structure_station import (  # noqa: E402
+    general_stations,
+    snap_candidates,
+    snap_structure_station,
+)
+
+TOTAL = 279.8
+STATIONS = general_stations(TOTAL, 20.0)
+# (입력, 기대) — 소수 → 정수 · 일반 측점 1 m 안 붙기 · 끝 측점(소수) 붙기
+CASES = [
+    (80.17, 80.0),  # 관 80.17 = 카드 80 한 자리
+    (80.6, 80.0),  # 1 m 안 → 일반 측점
+    (80.99, 80.0),
+    (81.0, 81.0),  # 꼭 1 m 는 밖 — 81 에 둘 수 있음(방향키가 갇히지 않음)
+    (50.5, 51.0),  # .5 는 올림(파이썬 · TS 같은 꼴)
+    (50.4, 50.0),
+    (263.31, 263.0),
+    (263.206, 263.0),
+    (127.86, 128.0),
+    (0.3, 0.0),
+    (279.3, 279.8),  # 끝 측점 1 m 안 → 끝 측점(정수가 아닌 일반 측점)
+    (278.6, 279.8),  # 반올림 279 가 끝 측점 1 m 안
+    (277.4, 277.0),
+]
+STEPS = [
+    ((80.0, 1), 81.0),
+    ((80.17, 1), 81.0),
+    ((80.17, -1), 80.0),  # 79.17 은 일반 측점 80 의 1 m 안
+    ((279.8, -1), 278.0),  # 279 는 끝 측점에 붙어 제자리 → 한 걸음 더
+    ((279.8, 1), 279.8),  # 노선 밖은 제자리
+    ((0.0, -1), 0.0),
+]
+STRUCTURES = [
+    {"structure_id": "sign", "placement": "point", "chainage_m": 127.86},
+    {
+        "structure_id": "wall",
+        "placement": "interval",
+        "chainage_m": 80.17,
+        "start_m": 75.17,
+        "end_m": 95.67,
+    },
+    {"structure_id": "ok", "placement": "point", "chainage_m": 40.0},
+    {"structure_id": "near", "placement": "point", "chainage_m": 20.4},
+]
+PIPES = [80.17, 120.0, 120.3, 263.31, 140.0]
+
+pytestmark = pytest.mark.skipif(
+    not (ROOT / "config" / "node_modules" / "typescript").is_dir(),
+    reason="프론트엔드 의존성 미설치",
+)
+
+
+@pytest.fixture(scope="module")
+def ts(tmp_path_factory) -> dict:
+    source = tmp_path_factory.mktemp("s234") / "in.json"
+    source.write_text(
+        json.dumps(
+            {
+                "stations": STATIONS,
+                "samples": [value for value, _ in CASES],
+                "steps": [list(args) for args, _ in STEPS],
+                "structures": STRUCTURES,
+                "pipes": PIPES,
+            }
+        ),
+        encoding="utf-8",
+    )
+    proc = subprocess.run(  # noqa: S603 — 고정 실행 파일
+        ["node", str(HERE / "helper_234_1_structure_station.cjs"), str(source)],
+        capture_output=True,
+        text=True,
+        encoding="utf-8",
+        cwd=str(ROOT),
+        check=False,
+    )
+    assert proc.returncode == 0, proc.stderr
+    return json.loads(proc.stdout)
+
+
+def test_general_stations() -> None:
+    assert STATIONS == [float(index * 20) for index in range(14)] + [279.8]
+
+
+@pytest.mark.parametrize(("value", "expected"), CASES)
+def test_snap_python(value: float, expected: float) -> None:
+    assert snap_structure_station(value, STATIONS) == expected
+    # 두 번 맞춰도 같음
+    assert snap_structure_station(expected, STATIONS) == expected
+
+
+def test_mirror_python_ts(ts) -> None:
+    assert ts["snap"] == [snap_structure_station(value, STATIONS) for value, _ in CASES]
+    assert ts["snapTwice"] is True
+
+
+def test_arrow_step_one_metre(ts) -> None:
+    assert ts["step"] == [expected for _, expected in STEPS]
+
+
+def test_general_registry_skips_irregular(ts) -> None:
+    assert ts["general"] == STATIONS  # 구조물 측점 80.17(irregular)은 일반 측점 아님
+    assert ts["defaultSnap"] == 80
+
+
+def test_form_input_integer(ts) -> None:
+    assert ts["remainderStep"] == "1"
+    assert ts["typed"] == 80  # 입력 4+0.17 = 80.17 → 80
+    assert ts["typedNear"] == 80  # 4+0.6 → 일반 측점 80 에 붙음
+    assert ts["typedOne"] == 81
+    assert ts["untouched"] == 80.17  # 안 고친 옛 값은 그대로(단추 몫)
+
+
+def test_moved_structure_range_ends_integer(ts) -> None:
+    assert ts["movedPoint"]["chainage_m"] == 128
+    wall = ts["movedWall"]
+    assert (wall["chainage_m"], wall["start_m"], wall["end_m"]) == (80, 75, 96)
+    drag = ts["movedDrag"]
+    assert (drag["chainage_m"], drag["start_m"], drag["end_m"]) == (133, 133, 145)
+
+
+def test_snap_button_plan_and_run(ts) -> None:
+    plan = ts["plan"]
+    assert [entry["index"] for entry in plan["structures"]] == [0, 1, 3]
+    assert plan["pipes"] == [[80.17, 80], [263.31, 263]]
+    assert plan["skipped"] == 1  # 120.3 → 120 자리에 관이 이미 있음
+    run = ts["run"]
+    assert run["count"] == 5 and run["emits"] == 1 and run["closed"] == 1
+    assert [s["chainage_m"] for s in run["structures"]] == [128, 80, 40, 20]
+    assert (run["structures"][1]["start_m"], run["structures"][1]["end_m"]) == (75, 96)
+    # 관은 하나씩 폼 [수정]과 같은 길 — 시설 속성이 그대로 실림
+    assert [(m["from"], m["to"]) for m in run["moves"]] == [(80.17, 80), (263.31, 263)]
+    assert run["moves"][0]["attributes"]["options"] == {"pipe_kind": "흄관"}
+    assert run["moves"][0]["attributes"]["facility"] == "pipe"
+    assert "5건" in run["confirmText"]
+    assert run["toasts"][-1]["message"].startswith("정수 맞춤 5건")
+    assert "1건은 그대로" in run["toasts"][-1]["message"]
+    # 두 번째 누름 — 옮길 것 없음(겹친 관만 알림)
+    assert ts["second"]["count"] == 0
+    assert "1건은 맞출 자리에 다른 관" in ts["second"]["toasts"][0]["message"]
+
+
+def test_plan_edit_follows_batch_move(ts) -> None:
+    # 213-2 규칙만으로는 여럿을 한꺼번에 옮기면 못 따라감(null) → 맞춘 자리로 따라감
+    assert ts["follow"] == [{"old": None, "next": 80}, {"old": None, "next": 263}]
+
+
+def test_drainage_map_pipe_integer(ts) -> None:
+    assert ts["editor"] == [141, 200]  # 옮김 141.37 → 141 · 추가 200.6 → 일반 측점 200
+
+
+def _vertices() -> list[RouteVertex]:
+    return [RouteVertex(x=0.0, y=0.0, z=0.0, chainage_m=0.0), RouteVertex(TOTAL, 0.0, 0.0, TOTAL)]
+
+
+def test_server_auto_placement_integer() -> None:
+    vertices = _vertices()
+    placed = [
+        StructureCandidate(chainage_m=80.374, x=80.374, y=0.0, reason="stream"),
+        StructureCandidate(chainage_m=150.6, x=150.6, y=0.0, reason="spacing"),
+        StructureCandidate(chainage_m=150.9, x=150.9, y=0.0, reason="spacing"),
+    ]
+    snapped = snap_candidates(placed, vertices)
+    assert [(p.chainage_m, p.x, p.reason) for p in snapped] == [
+        (80.0, 80.0, "stream"),
+        (151.0, 151.0, "spacing"),  # 같은 자리로 모인 둘째는 버림
+    ]
+
+
+def test_server_reprojection_integer() -> None:
+    points = [PipePoint(chainage_m=70.0, x=80.374, y=3.0, start_m=75.0, end_m=85.0)]
+    moved = project_pipe_points(points, _vertices())
+    assert moved[0].chainage_m == 80.0
+    assert (moved[0].start_m, moved[0].end_m) == (85.0, 95.0)  # 구간은 같은 만큼 밀림
+
+
+def test_wiring_source() -> None:
+    """받는 곳마다 맞춤이 걸렸는지(짝 머리 · 폼 · 끌기 · 방향키 · 관 · 단추)."""
+
+    def read(rel: str) -> str:
+        return (ROOT / rel).read_text(encoding="utf-8")
+
+    assert "common_util_structure_station.py" in read(
+        "common_util/common_util_structure_station.ts"
+    )
+    assert "common_util_structure_station.ts" in read(
+        "common_util/common_util_structure_station.py"
+    )
+    assert "movedStructure(structures[index], toChainageM)" in read(
+        "B05_Profile/B05_Profile_UI_Structures_Panel.ts"
+    )
+    assert "snapDock(list" in read("B05_Profile/B05_Profile_UI_Structures_Panel.ts")
+    assert "stepStructureStation(fromM" in read("B05_Profile/B05_Profile_UI_Profile_Panel_Tools.ts")
+    b06 = read("B06_Section/B06_Section_UI_Page_Structures_Panel.ts")
+    assert "const to = snapStructureStation(toChainageM)" in b06
+    assert "Math.abs(fromChainageM - toChainageM) > 0.005" in b06
+    assert "setGeneralStations" in read("B06_Section/B06_Section_Section_Store.ts")
+    assert "snap_candidates(" in read("common_util/common_util_drainage_detail.py")
+    for rel in (
+        "B05_Profile/B05_Profile_UI_Drainage_Panel.ts",
+        "B05_Profile/B05_Profile_UI_IrregularStations.ts",
+        "B05_Profile/B05_Profile_UI_Drainage_Parts.ts",
+        "B05_Profile/B05_Profile_UI_Structures_Panel_Commit.ts",
+    ):
+        assert "< 0.51" not in read(rel), rel  # 찾는 폭 = PIPE_MATCH_M 한 값
diff --git a/resources/tester/test_b05_station_roundtrip.py b/resources/tester/test_b05_station_roundtrip.py
index 22d113943..6c8ad7142 100644
--- a/resources/tester/test_b05_station_roundtrip.py
+++ b/resources/tester/test_b05_station_roundtrip.py
@@ -42,7 +42,8 @@ def test_화면_표기는_거리를_정수로(results):
 
 
 def test_칸을_고치면_친_값(results):
-    assert results["edited"] == pytest.approx(125.2)
+    # 친 값 125.2 → 정수 m 125(234-1 · 저장값도 정수 m — 9-29 「소수 그대로」를 바꿈)
+    assert results["edited"] == 125
     assert results["normalized"] == ["2", "10.0", 50]
     assert results["cleared"] is None