Laying structure for bridge cable of municipal comprehensive pipe ditch
By installing inspection wells at both ends of the bridge and using Type A and Type B conduits to secure power and communication cables, the problem of cables scattering across bridge sections was solved, enabling smooth cable crossing and convenient construction, and reducing project costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-28
AI Technical Summary
In sections of municipal roads and bridges, power and communication cables cannot be easily laid through integrated utility trenches, are prone to scattering, causing inconvenience in construction and maintenance, and making it impossible to use integrated utility trench laying methods.
Integrated utility tunnel inspection wells are installed at both ends of the bridge. Power and communication cables are centrally routed out of the inspection wells and then laid to the pedestrian walkway on the bridge using type A pipes. They are then fixed in the space above and below the bridge using type A and type B pipes, and constrained and limited by pipe sleepers, pipe racks and pipe supports.
This enabled the smooth crossing of power and communication cables across bridge sections, ensuring straight and neat cables, simplifying construction, reducing project costs, and improving the convenience of operation and management.
Smart Images
Figure CN224177855U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of municipal integrated pipe trench engineering, specifically relating to a laying structure for bridge cables in municipal integrated pipe trenches. Background Technology
[0002] In recent years, the construction of urban underground utility tunnels has returned to rationality. With the aim of upgrading and transforming urban underground pipe networks, eliminating overhead wires and promoting the undergrounding of overhead lines, and centralizing the placement of power and communication cables in trenches, the construction of integrated utility tunnels with small and flexible cross-sections, shallow burial depths, few ancillary facilities, convenient construction, short construction periods, low costs, and low operation and maintenance costs has ushered in a golden period of development.
[0003] However, in municipal road bridge sections, integrated utility trenches cannot be used for cable laying. Power and communication cables within the trench require inspection wells at both ends of the bridge. After all cables exit from the inspection wells, they are laid across the bridge using ductwork. Due to limited space under the bridge pedestrian walkways, and the risk of cables scattering and twisting if not properly secured, construction and maintenance are inconvenient. Therefore, a cable laying structure for integrated utility trenches across bridge sections needs to be proposed to ensure the smooth passage of cables within the trenches through the bridge sections. Summary of the Invention
[0004] To overcome the shortcomings of existing technologies, this utility model provides a laying structure for cables crossing bridges in municipal integrated utility trenches, which enables cables in integrated utility trenches to smoothly cross bridge sections, facilitating construction and maintenance.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A cable laying structure for crossing bridges in municipal integrated utility trenches, characterized in that:
[0007] The municipal integrated pipe trenches on both sides of the road are laid to both ends of the bridge, and inspection wells for the integrated pipe trenches are installed at both ends of the bridge.
[0008] All power cables and communication cables in the municipal utility tunnel are centrally routed out from the inspection well of the utility tunnel, and then laid to the pedestrian walkway on the bridge using Type A power conduits and Type A communication conduits. The Type A power conduits are split into multiple Type B power conduits and laid under the pedestrian walkway slab on the bridge, and the Type A communication conduits are converted into Type B communication conduits and laid under the pedestrian walkway slab on the bridge.
[0009] The Type A power duct is equipped with a power duct support to fix the power cable, and the Type A communication duct is equipped with a communication duct frame to fix the communication cable.
[0010] Both the Type B power duct and the Type B communication duct are equipped with pipe support structures to constrain and limit the movement of the cables.
[0011] Furthermore, Type A power ducts and Type A communication ducts are buried under the roadbed and sidewalks. Type A power ducts are arranged in 4 rows × 5 columns, and Type A communication ducts are arranged in 3 rows × 4 columns.
[0012] Furthermore, the Type A power duct and the Type A communication duct are provided with an outer sheath.
[0013] Furthermore, power protection pipes are installed outside the power cables inside the power ducts, and communication protection pipes are installed outside the communication cables inside the communication ducts.
[0014] Furthermore, the Type A power conduit is laid to a position 1m outside the pedestrian walkway on the bridge, and the 4×5 Type A power conduit is split into two 2×5 Type B power conduits. The Type A communication conduit is changed from a 3×4 buried conduit to a 3×4 installed Type B communication conduit.
[0015] Furthermore, the tube support structure is provided in sets every 3m, with each set being 300mm in length.
[0016] Furthermore, the pipe support structure includes two vertical supports, the bottom of which is close to the bridge deck pavement and the top of which reaches the bottom of the sidewalk slab; a horizontal cross brace is provided between the two vertical supports.
[0017] The beneficial effects of this utility model are:
[0018] 1) This utility model is implemented simultaneously with the bridge. The A-type power duct of the bridge section is split into B-type power ducts and laid under the pedestrian walkway on the bridge. The A-type communication duct is changed into B-type communication ducts and laid under the pedestrian walkway on the bridge. This allows the power and communication cables in the municipal integrated pipe trench to pass through the bridge section.
[0019] 2) This utility model effectively constrains and limits the protective pipes for power and communication cables under the pedestrian walkway on the bridge, ensuring that the power and communication protective pipes are straight and neatly arranged, which is convenient for subsequent wiring construction and operation management.
[0020] 3) This utility model has a simple structure, is easy to construct, uses widely available materials, and has a low cost;
[0021] 4) This utility model avoids crossing railways, highways, rivers or other important structures under the bridge separately, which greatly saves on project costs. Attached Figure Description
[0022] Figure 1 This is a plan view of the present utility model;
[0023] Figure 2 This is a structural diagram of a type A power duct.
[0024] Figure 3 This is a structural diagram of a type A communication duct.
[0025] Figure 4 This is a structural diagram of a type B power duct.
[0026] Figure 5 This is a structural diagram of a type B communication duct.
[0027] Figure 6 Cross-sectional layout of pipelines under the sidewalk slab:
[0028] In the diagram, 1—municipal integrated pipe trench; 2—inspection well of integrated pipe trench; 3—Type A power duct; 4—Type A communication duct; 5—Type B power duct; 6—Type B communication duct; 7—protective pipe for power duct; 8—protective pipe for communication duct; 9—pipe support; 10—pipe rack; 11—outer sheath of duct; 12—horizontal brace; 13—vertical brace. Detailed Implementation
[0029] The present invention will now be described in detail with reference to specific embodiments.
[0030] This utility model is implemented simultaneously with the bridge, enabling power and communication cables in municipal integrated pipe trenches to pass through the bridge. It also has strong adaptability to the spatial layout under the pedestrian walkway on the bridge. It can be reasonably disassembled and adjusted according to the bridge type, the cross-sectional layout under the pedestrian walkway, and spatial requirements. At the same time, it effectively constrains and limits the protective pipes for power and communication cables under the pedestrian walkway on the bridge, ensuring that the power and communication protective pipes are straight and neatly arranged, which facilitates subsequent cable laying construction and operation management.
[0031] In this embodiment, on normal sections of municipal roads, a single integrated utility trench is laid under each sidewalk on both sides, containing 20 10KV power cables and 12-hole communication cables. However, when the trench passes under a high-speed railway bridge (or possibly a bridge that crosses a highway, river, or important building), it is not possible to continue laying the cable in the integrated utility trench manner.
[0032] like Figure 1 As shown, the municipal integrated pipe trench 1 on both sides of the road is laid to a suitable position at both ends of the bridge, and the integrated pipe trench inspection well 2 is set at the ends of the bridge without affecting the bridge structure; the power cables and communication cables in the municipal integrated pipe trench 1 are all concentrated and exited in the integrated pipe trench inspection well 2, and then buried under the roadbed sidewalk with type A power pipe 3 and type A communication pipe 4, and laid to the sidewalk position on the bridge; in this embodiment, type A power pipe 3 adopts 4 rows × 5 columns, and type A communication pipe 4 adopts 3 rows × 4 columns.
[0033] In this embodiment, the A-type power conduit 3 in the bridge section is split into two rows of B-type power conduits 5 laid under the pedestrian walkway slab on the bridge. The A-type communication conduit 4 is transformed into a B-type communication conduit 6 after a series of practical and effective adjustments to its shape, size, and structure, and laid under the pedestrian walkway slab on the bridge. In this embodiment, the A-type power conduit 3 is laid to a position 1m outside the pedestrian walkway on the bridge, where a single 4×5 buried A-type power conduit 3 is split into two 2×5 installed B-type power conduits 5. The A-type communication conduit 4 is adjusted from a 3×4 buried conduit to a 3×4 installed B-type communication conduit 6. This utility model has strong adaptability to the spatial layout under the pedestrian walkway on the bridge. In this embodiment, the splitting of a large number of power conduits into two is only one approach. Depending on the bridge layout, the cross-sectional layout under the pedestrian walkway slab, and the space requirements, there can be various splitting schemes in actual engineering.
[0034] like Figure 6 As shown, type B power duct 5 and type B communication duct 6 are respectively laid in the spaces of the first, second and third holes under the pedestrian walkway slab on the bridge.
[0035] Power protection pipe 7 is installed outside the power cables in the power duct, and communication protection pipe 8 is installed outside the communication cables in the communication duct. Power protection pipe 7 has an outer diameter of DN160mm, is made of MPP pipe, and has a wall thickness of 8mm; communication protection pipe 8 has an outer diameter of DN110mm, is made of MPP pipe, and has a wall thickness of 5mm.
[0036] like Figure 2 , Figure 3 As shown, the A-type power duct 3 is equipped with a pipe support 9 inside to fix the power protection pipe 7, and the A-type communication duct 4 is equipped with a pipe rack 10 inside to fix the communication protection pipe 8. The pipe support 9 and the pipe rack 10 are both made of PE. The A-type power duct 3 and the A-type communication duct 4 are equipped with an outer pipe sheath 11. The outer pipe sheath 11 is made of C20 concrete, and the top surface of the sheath is covered with soil of not less than 0.6m.
[0037] like Figure 4 , Figure 5 As shown, both Type B power duct 5 and Type B communication duct 6 are equipped with pipe support structures to constrain and limit the movement of the protective pipes. Each set of pipe support structures is spaced 3 meters apart, with a length of 300 mm. The pipe support structure includes two vertical supports 13, with their bottoms flush against the bridge deck pavement and their tops reaching the bottom of the sidewalk slab. A horizontal cross brace 12 is installed between the two vertical supports 13, positioned between the upper and lower rows of cables. Type B power duct 5 has a width of 860 mm, and Type B communication duct 6 has a width of 500 mm. Both the cross brace 12 and the vertical support 13 are made of galvanized steel plate with a thickness δ = 12 mm. The connection between the cross brace 12 and the vertical support 13 is a double-sided fillet weld with a weld height K = 8 mm.
[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0039] The content of this utility model is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solution of this utility model after reading this utility model specification shall be covered by the claims of this utility model.
Claims
1. A laying structure for cable crossings in municipal integrated utility trenches, characterized in that: The municipal integrated pipe trench (1) on both sides of the road is laid to both ends of the bridge, and the integrated pipe trench inspection well (2) is set at both ends of the bridge; All power cables and communication cables in the municipal integrated pipe trench (1) are concentrated and exited in the inspection well (2) of the integrated pipe trench, and then laid to the pedestrian walkway on the bridge using type A power pipe (3) and type A communication pipe (4); type A power pipe (3) is split into multiple type B power pipes (5) and laid under the pedestrian walkway on the bridge, and type A communication pipe (4) is changed to type B communication pipe (6) and laid under the pedestrian walkway on the bridge; The A-type power duct (3) is equipped with a power duct pillow (9) to fix the power cable, and the A-type communication duct (4) is equipped with a communication duct frame (10) to fix the communication cable. Both the type B power duct (5) and the type B communication duct (6) are equipped with pipe support structures to constrain and limit the cables.
2. The laying structure for a municipal integrated pipe trench overpass cable according to claim 1, characterized in that: Type A power duct (3) and Type A communication duct (4) are buried under the roadbed and sidewalk. Type A power duct (3) adopts 4 rows × 5 columns, and Type A communication duct (4) adopts 3 rows × 4 columns.
3. The laying structure for a municipal integrated pipe trench overpass cable according to claim 2, characterized in that: The A-type power duct (3) and the A-type communication duct (4) are provided with an outer duct sheath (11).
4. The laying structure for a municipal integrated pipe trench overpass cable according to claim 3, characterized in that: Power protection pipes (7) are installed outside the power cables in the power duct, and communication protection pipes (8) are installed outside the communication cables in the communication duct.
5. The laying structure for a municipal integrated pipe trench overpass cable according to claim 4, characterized in that: The type A power duct (3) is laid to a position 1m outside the pedestrian walkway on the bridge. The 4×5 type A power duct (3) is split into two 2×5 type B power ducts (5). The type A communication duct (4) is changed from a 3×4 buried duct to a 3×4 installed type B communication duct (6).
6. The laying structure for a municipal integrated pipe trench overpass cable according to claim 5, characterized in that: The tube support structure is set at 3m intervals, and each set is 300mm long.
7. The laying structure for a municipal integrated pipe trench overpass cable according to claim 6, characterized in that: The pipe support structure includes two vertical supports (13), the bottom of which is close to the bridge deck pavement and the top reaches the bottom of the sidewalk slab; a horizontal cross brace (12) is provided between the two vertical supports (13).