Dry and wet separated steel bridge sidewalk structure
By using a steel bridge pedestrian structure with dry and wet separation, the problems of difficult pipeline layout and insufficient drainage in concrete pedestrian structures have been solved. This has achieved efficient drainage, prevented pipeline damage, improved the landscape effect, and enhanced the durability and safety of the bridge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 中国市政工程西北设计研究院有限公司
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-21
AI Technical Summary
Existing concrete sidewalk structures suffer from problems such as difficulties in pipeline layout, loose joints leading to leaks, insufficient drainage capacity, poor aesthetic appeal, and easy damage to pipelines, which affect the durability and safety of the bridge structure.
The steel bridge pedestrian structure adopts a dry and wet separation design, separating power and telecommunications lines from the bridge drainage pipes. Dry and wet sections are laid separately, eliminating socket connections and using longitudinal drainage pipes and overflow drainage pipes to improve drainage efficiency and keep the pipelines dry.
It achieves efficient drainage, prevents pipelines from being damaged by water immersion, enhances space utilization and landscape effect, simplifies the maintenance process, and improves the durability and safety of the bridge.
Smart Images
Figure CN224148515U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of bridge engineering, specifically relating to a steel bridge pedestrian walkway structure with dry and wet separation. Background Technology
[0002] In urban bridge construction, it is common to place pipelines, utility lines, and drainage systems on bridges to cross obstacles. This pipeline crossing scheme not only ensures the normal operation of pipelines, but also saves space and costs and improves project efficiency.
[0003] As an important ancillary structure of urban bridges, sidewalks are generally elevated, forming a clear physical separation from the roadway. In addition to providing passage for pedestrians and ensuring their safety, the space created by the height difference between the sidewalk slab and the bridge deck is usually used as a channel for laying important pipelines and the bridge's own drainage system.
[0004] In previous projects, sidewalks were typically constructed of concrete. The sidewalk slabs were connected to the bridge cantilever by several vertical walls and curbs. Drainage from the bridge deck was achieved using prefabricated horizontal drainage pipes spaced at intervals, leading to the area under the sidewalk slabs. From there, the drainage flowed through vertical drain pipes running through the main beams and into longitudinal collection pipes suspended under the cantilever. Underpass pipelines were laid alongside or in the remaining space above the drainage pipes. While this type of sidewalk structure is simple, easy to construct, and relatively inexpensive, it still presents the following problems:
[0005] ① The concrete structure is large in size, while the sidewalk slabs have small spans and limited internal clearance, making pipeline layout difficult. The bridge's drainage pipes are embedded under the sidewalk slabs, occupying valuable space and resulting in low space utilization.
[0006] ② The bridge's drainage outlets, drainage pipes, and longitudinal collection pipes are connected by spigot and socket joints, resulting in numerous interfaces, poor overall integrity, and a tendency for problems such as loose interfaces leading to leaks, pipe tilting and displacement. Due to the large number of components, these issues are difficult to detect and repair.
[0007] ③ The number of drainage outlets is limited, the diameter of the drainage pipes is small, and the pipes are easily blocked by mud and debris, resulting in insufficient drainage capacity. In the event of extremely heavy rain, water accumulation and overflow on the bridge can easily occur, affecting the durability of the bridge structure.
[0008] ④ The exposed longitudinal rainwater collection pipes under the bridge cantilever obstruct the structural lines of the bridge and result in a poor landscape effect; at the same time, the suspension position is inconvenient for daily operation and maintenance, and if damage occurs, a basket-type inspection vehicle will be required for repair.
[0009] ⑤ When power and telecommunications lines are laid in the same compartment as bridge drainage pipes, these lines are highly sensitive to water and require moisture-proof and waterproof protection. Prolonged exposure to rainwater will inevitably damage the lines, potentially causing power outages, disrupting normal production and daily life, and even posing a danger to pedestrians. Furthermore, the drainage pipes are prone to loosening and leaking, and their low drainage efficiency makes it difficult to maintain a dry environment on sidewalks, posing a significant safety hazard.
[0010] In summary, there is an urgent need for a compact and efficient pedestrian walkway structure that is simple in structure, easy to implement and maintain, facilitates rainwater drainage from the bridge deck, and ensures a dry environment for pipeline installation. Utility Model Content
[0011] The purpose of this utility model is to provide a dry and wet separation steel bridge pedestrian structure to solve the problems of easy blockage of drainage pipe openings and the easy damage to power and telecommunications pipelines caused by water immersion when laid in the same compartment as the bridge drainage pipe.
[0012] The technical solution of this utility model is: a dry and wet separation steel bridge pedestrian structure, including a bridge box girder, with cantilevered box girder arms on both sides of the bridge box girder. Each cantilevered box girder arm is formed by an upper flange plate, an outer flange plate, a lower flange plate, and the sidewalls of the bridge box girder. An outer flange plate is provided on the outer side of the top of the upper flange plate along the longitudinal direction of the bridge, and an inner flange plate is provided on the inner side of the top of the upper flange plate along the longitudinal direction of the bridge. A central partition plate is provided on the top of the upper flange plate along the longitudinal direction of the bridge, located between the outer flange plate and the inner flange plate. An outer longitudinal plate is provided on the outer flange plate along the longitudinal direction of the bridge, and the outer longitudinal plate... A dry compartment cover is provided between the partition plates along the longitudinal bridge direction. The area enclosed by the outer side plate, outer longitudinal plate, dry compartment cover, partition plate and upper flange plate forms the dry compartment. An inner longitudinal plate along the longitudinal bridge direction is provided on the inner side plate. A wet compartment cover is provided between the inner longitudinal plate and the partition plate along the longitudinal bridge direction. Multiple water-passing screen holes are opened on the inner side plate along the longitudinal bridge direction. The area enclosed by the inner side plate, inner longitudinal plate, wet compartment cover, partition plate and upper flange plate forms the wet compartment. A longitudinal drainage pipe is provided in the wet compartment. The outer longitudinal plate, dry compartment cover, wet compartment cover and inner longitudinal plate constitute the walkway slab.
[0013] As a further improvement of this utility model, an overflow pipe is provided between the upper flange plate and the lower flange plate at the wet chamber. The top of the overflow pipe is connected to the wet chamber, and the bottom of the overflow pipe extends out of the lower flange plate.
[0014] As a further improvement of this utility model, a drain pipe is provided on the lower flange plate of the wet chamber. The top of the drain pipe is connected to the space above the lower flange plate, and the bottom of the drain pipe extends out of the lower flange plate.
[0015] As a further improvement of this utility model, the upper flange plate at the wet chamber is bent to form a water drop step, which is close to the water passage screen hole.
[0016] As a further improvement of this utility model, longitudinal stiffening ribs are provided on the lower surfaces of the outer longitudinal plate, the dry silo cover plate, the wet silo cover plate, and the inner longitudinal plate.
[0017] As a further improvement of this utility model, a lighting pipeline compartment is provided inside the wet chamber.
[0018] As a further improvement of this utility model, side pads are provided at the bottom of the connection between the outer longitudinal plate and the dry silo cover plate, and at the bottom of the connection between the inner longitudinal plate and the wet silo cover plate, and are fixed by fastening bolts.
[0019] As a further improvement of this utility model, a central pad is provided on both sides of the upper end of the partition plate, and the dry compartment cover plate and the wet compartment cover plate are respectively fixed to the central pad plate by fastening bolts.
[0020] The beneficial effects of this utility model are:
[0021] 1. This utility model is designed with a single-box double-compartment structure that separates wet and dry areas, laying power and telecommunications pipelines and bridge drainage pipes in separate compartments, thus avoiding damage to the pipelines caused by long-term contact with rainwater.
[0022] 2. This utility model eliminates the drain outlet, drain pipe, and longitudinal collection pipe of the socket connection, and uses a wet chamber for rainwater collection and discharge, which solves the problem of pipe blockage, improves the drainage efficiency of the bridge deck, and avoids bridge deck overflow caused by heavy rain.
[0023] 3. This utility model replaces the traditional concrete sidewalk with a lightweight steel structure, which reduces the structural weight, increases the internal space, and improves its space utilization.
[0024] 4. This utility model has a simple structure and ample space, avoiding the exposure of the longitudinal rainwater collection pipe, resulting in good landscape performance and convenient maintenance. Attached Figure Description
[0025] Figure 1 This is a cross-sectional layout diagram of this utility model;
[0026] Figure 2 yes Figure 1 AA view in the middle;
[0027] Figure 3 yes Figure 1 BB view in the middle;
[0028] Figure 4 yes Figure 1 CC cross-section;
[0029] Figure 5 yes Figure 1 DD cross-section;
[0030] Figure 6 yes Figure 1 EE cross-section.
[0031] In the diagram: 1. Sidewalk slab; 11. Outer longitudinal plate; 12. Side pad; 13. Dry compartment cover; 14. Wet compartment cover; 15. Fastening bolts; 16. Longitudinal stiffening ribs; 17. Inner longitudinal plate; 18. Central pad; 2. Outer side plate; 3. Inner side plate; 31. Water sieve holes; 4. Central partition plate; 5. Box girder cantilever; 51. Upper flange plate; 52. Longitudinal drainage pipe; 53. Water drop step; 54. Lower flange plate; 55. Outer flange plate; 56. Web plate; 6. Overflow pipe; 7. Drainage pipe; 8. Lighting pipeline compartment; 9. Bridge box girder; 100. Dry compartment; 200. Wet compartment. Detailed Implementation
[0032] The present invention will now be described in detail with reference to the accompanying drawings.
[0033] like Figure 1-6 As shown, a dry and wet separation steel bridge pedestrian structure includes a bridge box girder 9, with box girder cantilever 5 on both sides of the bridge box girder 9. The box girder cantilever 5 is formed by an upper flange plate 51, an outer flange plate 55, a lower flange plate 54 and the side wall of the bridge box girder 9, and a web plate 56 is provided in the middle.
[0034] An outer side plate 2 is provided on the outer side of the top of the upper flange plate 51 along the longitudinal bridge direction, an inner side plate 3 is provided on the inner side of the top of the upper flange plate 51 along the longitudinal bridge direction, and a middle partition plate 4 is provided on the top of the upper flange plate 51 along the longitudinal bridge direction. The middle partition plate 4 is located between the outer side plate 2 and the inner side plate 3.
[0035] An outer longitudinal plate 11 along the longitudinal bridge direction is provided on the outer side plate 2. A dry compartment cover 13 along the longitudinal bridge direction is provided between the outer longitudinal plate 11 and the middle partition plate 4. The area enclosed by the outer side plate 2, the outer longitudinal plate 11, the dry compartment cover 13, the middle partition plate 4 and the upper flange plate 51 forms a dry compartment 100. The dry compartment 100 is used for laying the bridge pipeline.
[0036] The inner side plate 3 is provided with an inner longitudinal plate 17 along the longitudinal direction of the bridge. Between the inner longitudinal plate 17 and the middle partition plate 4, there is a wet chamber cover 14 along the longitudinal direction of the bridge. Multiple water-passing screen holes 31 are opened on the inner side plate 3 along the longitudinal direction of the bridge. The area enclosed by the inner side plate 3, the inner longitudinal plate 17, the wet chamber cover 14, the middle partition plate 4 and the upper flange plate 51 forms a wet chamber 200. A sunken longitudinal drainage pipe 52 is provided at the upper flange plate 51 of the wet chamber 200. The wet chamber 200 is used for the discharge of rainwater from the bridge deck.
[0037] The outer longitudinal plate 11, the dry storage cover plate 13, the wet storage cover plate 14, and the inner longitudinal plate 17 constitute the pedestrian walkway slab 1.
[0038] An overflow pipe 6 is provided between the upper flange plate 51 and the lower flange plate 54 at the wet chamber 200. The top of the overflow pipe 6 is connected to the wet chamber 200, and the bottom of the overflow pipe 6 extends out of the lower flange plate 54.
[0039] A drain pipe 7 is provided on the lower flange plate 54 at the wet chamber 200. The top of the drain pipe 7 is connected to the space above the lower flange plate 54, and the bottom of the drain pipe 7 extends out of the lower flange plate 54.
[0040] The upper flange plate 51 at the wet chamber 200 is bent to form a water drop step 53, which is close to the water passage screen 31.
[0041] The lower surfaces of the outer longitudinal plate 11, the dry compartment cover plate 13, the wet compartment cover plate 14, and the inner longitudinal plate 17 are all provided with longitudinal stiffening ribs 16 to improve the overall rigidity of the sidewalk slab 1.
[0042] The wet chamber 200 contains a lighting pipeline compartment 8 for laying the bridge's own lighting pipelines. The lighting pipeline compartment 8 is located at the corner of the inner side plate 3 and the inner longitudinal plate 17.
[0043] Side pads 12 are provided at the bottom of the connection between the outer longitudinal plate 11 and the dry silo cover plate 13, and at the bottom of the connection between the inner longitudinal plate 17 and the wet silo cover plate 14, and are fixed by fastening bolts 15.
[0044] The upper sides of the partition plate 4 are respectively provided with a central pad plate 18, and the dry silo cover plate 13 and the wet silo cover plate 14 are respectively fixed to the central pad plate 18 by fastening bolts 15.
[0045] The sidewalk slab 1, outer side slab 2, inner side slab 3, central partition 4, cantilevered box girder 5, overflow pipe 6, and drainage pipe 7 all require anti-corrosion treatment to improve the durability of the structure.
[0046] The lower ends of the outer side plate 2, inner side plate 3, and central diaphragm 4 are welded to the upper flange plate 51. The pedestrian walkway slab 1 is supported on the cantilever 5 of the box girder by the outer side plate 2, inner side plate 3, and central diaphragm 4. The centerline of the outer side plate 2 coincides with that of the outer flange plate 55, and the centerline of the central diaphragm coincides with that of the cantilever web plate 56. A closed box-shaped section is formed between the pedestrian walkway slab 1 and the upper flange plate 51, with the central diaphragm 4 centrally located, forming the main frame structure of the "dry on the left and wet on the right" double-compartment pedestrian walkway. The inner side plate 3 has water-passing screen holes 31 evenly arranged along the longitudinal direction of the bridge. Rainwater from the bridge deck flows through the water-passing screen holes 31 into the longitudinal drainage pipe 5, improving the drainage efficiency of the bridge deck.
[0047] The sidewalk slab 1 is the component that directly bears the pedestrian load, and it consists of an outer longitudinal plate 11, a dry compartment cover 13, a wet compartment cover 14, and an inner longitudinal plate 17. The outer longitudinal plate 11 and the inner longitudinal plate 17 are respectively arranged on both sides of the sidewalk, running the entire length of the bridge, and are welded to the outer side plate 2 and the inner side plate 3, respectively. Two side pads 12 are provided, one on the left and one on the right. Half of the left side pad 12 is arranged under the outer longitudinal plate 11 and fixed with fastening bolts 15, while the other half extends outward to fix the dry compartment cover 13. Similarly, half of the right side pad 12 is arranged under the inner longitudinal plate 17 and fixed with fastening bolts 15, while the other half extends outward to fix the wet compartment cover 14. The central pad 18 is welded to the central partition plate 4. The dry compartment cover 13 and wet compartment cover 14 are prefabricated in longitudinal sections. Their lengths can be adjusted according to on-site installation and maintenance needs. The dry compartment cover 13 and wet compartment cover 14 rest on the side pad 12 and the central pad 18, and are fixed with fastening bolts 15. During the installation and maintenance of the bridge-crossing pipelines and longitudinal drainage pipes 52, the dry compartment cover 13 and wet compartment cover 14 can be opened by loosening the fastening bolts 15. After construction is completed, the dry compartment cover 13 and wet compartment cover 14 are fixed again with the fastening bolts 15. The completed pedestrian walkway slab 1 has a 2% transverse slope along the transverse direction of the bridge, with the downslope direction facing the bridge box girder 9.
[0048] The upper flange plate 51 at the wet chamber 200 is partially cut and welded to a semi-circular arc plate to form a longitudinal drainage pipe 52. The upper flange plate 51 on the side near the bridge box girder 9 is folded to form a zigzag-shaped drop step 53, ensuring that the step has a height difference of not less than 10cm, improving drainage efficiency while preventing rainwater backflow from the bridge deck. The inner side plate 3, the central partition plate 4, the longitudinal drainage pipe 52, the drop step 53, and the pedestrian walkway slab 1 together form an open wet chamber for rainwater drainage from the bridge deck.
[0049] Near the central partition 4, a vertical opening is made in the cantilever 5 of the box girder in the wet compartment 200. The opening penetrates the upper flange plate 51 and the lower flange plate 54 to install the overflow pipe 6, ensuring safe drainage during heavy rainstorms. At the root of the cantilever 5, a hole is made in the lower flange plate 54 to install the drain pipe 7, used to drain seepage water from the cantilever 5. Both the overflow pipe 6 and the drain pipe 7 are made of steel round pipes, welded to the cantilever 5, with the bottom extending at least 10cm beyond the lower flange plate 54, and the ends are beveled to form an acute angle to prevent rainwater from flowing back along the pipe wall and wetting the bridge box girder 9. The overflow pipe 6 and the drain pipe 7 are arranged at intervals of 1-5m along the longitudinal direction of the bridge, serving both drainage and ventilation functions to ensure the compartment remains dry and reduce the risk of corrosion.
[0050] Rubber strips can be placed between the side pad 12 and the outer longitudinal plate 11, the dry compartment cover 13, the wet compartment cover 14, and the inner longitudinal plate 17, as well as between the middle pad 18 and the dry compartment cover 13 and the wet compartment cover 14, to fill the gaps between the plates and further improve the waterproof performance of the structure.
[0051] Finally, a paving layer is constructed on top of the sidewalk slab 1. The thickness of the paving layer must ensure that the top of the fastening bolts 15 are not exposed.
[0052] This utility model can be implemented through the following steps: ① The cantilever 5 of the box girder and the box girder 9 of the bridge body are processed in the factory, and the overflow pipe 6 and the drain pipe 7 are also welded and assembled simultaneously. ② If the lifting conditions of the box girder 9 of the bridge body are good, the outer side plate 2, the inner side plate 3, and the middle partition plate 4 are welded in the factory, and the side pad plate 12 and the middle pad plate 18 are fixed to prevent the steel plates from warping and deforming during the lifting process; otherwise, after the lifting of the box girder 9 of the bridge body is completed, the component welding construction is carried out on site. ③ After the beam body is lifted and spliced, the pipelines crossing the bridge are installed and laid. ④ The remaining dry compartment cover plate 13 and wet compartment cover plate 14 are installed, and finally the sidewalk paving construction is carried out.
[0053] This utility model is a simple, convenient, and efficient pedestrian walkway structure that is easy to implement and maintain. While achieving efficient drainage and flood discharge on the bridge deck, it can also provide a dry laying environment for pipelines crossing the bridge.
Claims
1. A dry-wet separated steel bridge sidewalk structure comprising a bridge body box girder, characterized in that: Box girder cantilever (5) is provided on both sides of the bridge box girder (9). The box girder cantilever (5) is formed by the upper flange plate (51), the outer flange plate (55), the lower flange plate (54) and the side wall of the bridge box girder (9). An outer side plate (2) is provided on the outer side of the top of the upper flange plate (51) along the longitudinal bridge direction, an inner side plate (3) is provided on the inner side of the top of the upper flange plate (51) along the longitudinal bridge direction, and a middle partition plate (4) is provided on the top of the upper flange plate (51) along the longitudinal bridge direction. The middle partition plate (4) is located between the outer side plate (2) and the inner side plate (3). An outer longitudinal plate (11) along the longitudinal bridge direction is provided on the outer side plate (2), and a dry silo cover plate (13) along the longitudinal bridge direction is provided between the outer longitudinal plate (11) and the middle partition plate (4). The area enclosed by the outer side plate (2), the outer longitudinal plate (11), the dry silo cover plate (13), the middle partition plate (4) and the upper flange plate (51) forms a dry silo (100). An inner longitudinal plate (17) is provided on the inner side plate (3) along the longitudinal bridge direction. A wet chamber cover plate (14) along the longitudinal bridge direction is provided between the inner longitudinal plate (17) and the middle partition plate (4). Multiple water-passing screen holes (31) are opened on the inner side plate (3) along the longitudinal bridge direction. The area enclosed by the inner side plate (3), the inner longitudinal plate (17), the wet chamber cover plate (14), the middle partition plate (4) and the upper flange plate (51) forms a wet chamber (200). A longitudinal drainage pipe (52) is provided in the wet chamber. The outer longitudinal plate (11), the dry storage cover plate (13), the wet storage cover plate (14), and the inner longitudinal plate (17) constitute the pedestrian walkway slab (1).
2. A dry separation steel bridge walkway structure according to claim 1, characterized in that: An overflow pipe (6) is provided between the upper flange plate (51) and the lower flange plate (54) at the wet chamber (200). The top of the overflow pipe (6) is connected to the wet chamber (200), and the bottom of the overflow pipe (6) extends out of the lower flange plate (54).
3. A dry separation steel bridge walkway structure according to claim 1 or 2, characterized in that: A drain pipe (7) is provided on the lower flange plate (54) at the wet chamber (200). The top of the drain pipe (7) is connected to the space above the lower flange plate (54), and the bottom of the drain pipe (7) extends out of the lower flange plate (54).
4. A dry separation steel bridge walkway structure according to claim 3, characterized in that: The upper flange plate (51) at the wet chamber (200) is bent to form a water drop step (53), which is close to the water passage screen (31).
5. A dry separation steel bridge walkway structure as claimed in claim 4, wherein: The lower surfaces of the outer longitudinal plate (11), dry silo cover plate (13), wet silo cover plate (14) and inner longitudinal plate (17) are all provided with longitudinal stiffening ribs (16).
6. A dry-wet separation steel bridge pedestrian structure according to claim 5, characterized in that: The wet chamber (200) is equipped with a lighting pipeline compartment (8).
7. A dry separation steel bridge walkway structure as claimed in claim 6, wherein: The bottom of the connection between the outer longitudinal plate (11) and the dry silo cover plate (13) and the bottom of the connection between the inner longitudinal plate (17) and the wet silo cover plate (14) are respectively provided with side pads (12) and fixed by fastening bolts (15).
8. A dry separation steel bridge walkway structure as claimed in claim 6, wherein: The upper sides of the partition plate (4) are respectively provided with a central pad plate (18), and the dry silo cover plate (13) and the wet silo cover plate (14) are respectively fixed on the central pad plate (18) by fastening bolts (15).