{
  "id": "city-bridge-expansion-joint",
  "type": "model",
  "title": "橋梁床版用フィンガー伸縮継手",
  "titleEn": "Bridge deck finger expansion joint",
  "description": "橋梁道路の継ぎ目に埋め込む静的なフィンガー型伸縮継手。互い違いの厚鋼板には実際の隙間があり、下面の支持アングル、補剛板、締結ボルト、埋込みアンカーと開いたゴム製受け樋を備えます。排水格子やケーブル保護スロープではありません。床版・舗装・車両は付属せず、設置時は上面を道路面に合わせて下部を沈めてください。移動・排水の機能、荷重や道路規格の適合性は未検証。 ゲーム・可視化向け。製造・構造設計・3Dプリント用途は未検証。 外接寸法（X×Y×Z）2.400 × 0.371 × 1.288 m、22,460三角形。単位m・Y-up、水平中央の接地用原点、最下点Y=0。部品ごとの重複UV0と単色PBR材質を収録し、画像テクスチャ・UV2・コライダー・LOD・リグ・動作は付属しません。静的表示用でUnity/VRChat実機検証は未実施。STLはm・Y-up座標の形状のみで色・材質・UV・階層を含みません。",
  "descriptionEn": "A static embedded finger expansion joint for bridge-road deck seams. Interleaved thick steel comb plates have actual clearance gaps, with underside support angles, gussets, fastening bolts, embed anchors and an open elastomer trough. This is not a storm-drain grate or cable ramp. Road deck, pavement and vehicles are omitted; lower the assembly into its host surface until the finger plate top aligns with the road plane. No movement, drainage function, traffic load rating or road-standard compliance is supplied. For games and visualization; not validated for manufacture, structural engineering or 3D printing. Bounding dimensions (X×Y×Z): 2.400 × 0.371 × 1.288 m; 22,460 triangles. Metres, Y-up, horizontally centered placement origin with minimum Y=0, not an articulation or wall-mount pivot. Includes overlapping component UV0 and constant-color PBR materials, with no image textures, unique UV2, colliders, LOD, rig or runtime behavior. Static visualization only; Unity/VRChat editor and runtime tests have not been performed. STL uses metre-valued Y-up coordinates and contains geometry only, without color, materials, UVs or hierarchy.",
  "category": "urban",
  "tags": [
    "city",
    "street",
    "original",
    "bridge",
    "expansion-joint",
    "infrastructure",
    "伸縮継手"
  ],
  "author": "Xenoah",
  "license": "CC-BY-4.0",
  "version": "1.0.0",
  "status": "public",
  "created": "2026-10-14",
  "updated": "2026-10-14",
  "thumbnail": "https://raw.githubusercontent.com/Xenoah/meshcopia/19c77f5d75f69599aabb6e306a2cf1beb230b1f5/content/assets/city-bridge-expansion-joint/preview.png",
  "preview": "city-bridge-expansion-joint.glb",
  "unit": "m",
  "upAxis": "Y",
  "triangles": 22460,
  "dimensions": [
    2.4,
    0.37094,
    1.288
  ],
  "uv": "Per-component primitive or automatically unwrapped UVs. Overlapping between components; not a packed unique lightmap atlas. Solid-color PBR materials; no external textures. STL has no colors or UVs.",
  "provenance": {
    "method": "Original AI-agent-authored procedural city geometry",
    "tool": "Blender 4.3.2; Meshcopia original city expansion generator 1.0",
    "rights": "Original geometry and material design created for Xenoah Meshcopia under the owner request for CC-BY-4.0 publication. No third-party meshes, scans, brands, logos or font files.",
    "generatorUrl": "https://github.com/Xenoah/meshcopia/blob/main/scripts/city_expansion/frozen/batch-009/scripts/city_expansion/transport_utilities.py",
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    "sourceHelpersSha256": "99ea76b4c3073b3ec2cfdf732e987c7977bfe5efc986b4a077df8db35a6f9d15",
    "alternateFormat": "STL triangulated from the exact reimported GLB, metre-valued Y-up coordinates. No printability or manufacture validation.",
    "stlSha256": "ad25a17f1b2b83eb755dced77811a50b2e87d9a417d11e543f1936f599c1d794"
  },
  "usages": [
    {
      "relationship": "original",
      "project": "Meshcopia",
      "sourceUrl": "https://github.com/Xenoah/meshcopia",
      "sourcePaths": [
        "scripts/city_expansion/frozen/batch-009/scripts/city_expansion/transport_utilities.py",
        "scripts/city_expansion/frozen/batch-009/scripts/city_expansion/common.py"
      ],
      "selectors": [
        "city-bridge-expansion-joint"
      ],
      "context": "Original city asset created for this library. No external deployment or reuse claimed."
    }
  ],
  "pageUrl": "https://xenoah.github.io/meshcopia/assets/city-bridge-expansion-joint/",
  "manifestUrl": "https://xenoah.github.io/meshcopia/api/assets/city-bridge-expansion-joint.json",
  "attribution": "Bridge deck finger expansion joint by Xenoah / Meshcopia\nhttps://xenoah.github.io/meshcopia/assets/city-bridge-expansion-joint/\nCC BY 4.0 — https://creativecommons.org/licenses/by/4.0/\nChanges: none. If modified, replace this line with a description of your changes.",
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        "filename": "LICENSE.txt",
        "sha256": "7679771788e9ba7aa1e2c5444a410ac09d2ad89238ee5539527e6e0d52780449",
        "text": "Bridge deck finger expansion joint by Xenoah / Meshcopia\nCopyright (c) 2026 Xenoah\nCC BY 4.0: https://creativecommons.org/licenses/by/4.0/\nSource: https://xenoah.github.io/meshcopia/assets/city-bridge-expansion-joint/\nProvided as-is, without warranties (license Section 5).\nChanges: none.\nAdditional changes: Converted unchanged source GLB geometry to FBX, with documented compatible material/texture derivatives.\n"
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}