Bridge expansion joint drainage structure and drainage system thereof
By installing water collection channels and drainage pipes inside the bridge expansion joints, the problem of water accumulation at the bridge expansion joints that cannot be drained has been solved, enabling timely drainage of accumulated water, avoiding damage to asphalt pavement and bridge corrosion, extending service life and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN NO 4 ENG CO
- Filing Date
- 2025-04-23
- Publication Date
- 2026-04-21
AI Technical Summary
Water accumulation at bridge expansion joints cannot be drained in time, leading to damage to the asphalt surface and corrosion of the bearing steel plates, affecting the structural safety and appearance quality of the bridge.
Water collection troughs and drainage pipes are installed inside the expansion joints. The water collection troughs are filled with materials to enhance compressive strength, and the accumulated water is drained into the bridge beam connection joints through the drainage pipes. Water-swellable sealing strips and filter layers are combined to prevent clogging.
It effectively drains water from expansion joints, preventing damage to asphalt pavement, extending service life, preventing rainwater and sewage from corroding bridge structures, reducing maintenance costs, and ensuring bridge safety and appearance quality.
Smart Images
Figure CN224148540U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of bridge construction technology, specifically relating to a bridge expansion joint drainage structure and its drainage system. Background Technology
[0002] Currently, most municipal bridge decks use asphalt pavement, and expansion joints are typically modular or comb-shaped. Expansion joints are located between the asphalt pavement layers at the top of adjacent bridge sections, with the connecting joint between the two sections located below the expansion joint. Bridge asphalt pavements generally rely solely on drainage ditches on both sides of the bridge deck for drainage. Because the asphalt pavement is permeable and the bridge deck has a certain longitudinal slope, rainwater seeps from higher elevations to the expansion joints. The concrete at the expansion joints acts as a retaining wall, preventing the seepage. Since the cross slope of bridges is generally very small, water cannot drain from the expansion joints in a timely manner. Over time, the accumulated water at the expansion joints, repeatedly squeezed by passing vehicles, leads to cracking, peeling, and potholes in the asphalt surface layer. Finally, due to aging and vehicle traffic, the bridge expansion joints themselves can become damaged, resulting in leaks. Rainwater and sewage on the bridge deck can seep through expansion joints and pollute the bridge beams, piers, and cap beams, affecting the overall appearance of the bridge. In severe cases, it can corrode the bearing steel plates, accelerate the aging of the bearings, and thus endanger the structural safety of the bridge. Utility Model Content
[0003] In view of the existing technical problems, this utility model aims to provide a drainage structure and drainage system for bridge expansion joints, which can solve the technical problem of water accumulation at expansion joints in the prior art.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A bridge expansion joint drainage structure includes a bridge beam, an asphalt pavement layer on top of the bridge beam, and an expansion joint connecting two adjacent bridge beam sections. Its structural features include: a water collection trough extending into the width direction of the bridge beam and filled with a filler material; the opening side of the water collection trough is adjacent to the asphalt pavement layer, and the bottom of the trough is located below the bottom of the asphalt pavement layer; the bottom of the water collection trough is fixedly connected to the bridge beam, and the top of the water collection trough is fixedly connected to the asphalt pavement layer; a first drainage pipe is provided on the water collection trough, extending into the connecting joint between the two adjacent bridge beam sections.
[0006] Since the water collection trough is located within the expansion joint, a filler is placed inside to enhance its compressive strength and prevent the expansion joint concrete from affecting its structure. The water collection trough collects seepage water from the asphalt pavement layer and between the asphalt pavement layer and the expansion joint, and then discharges it through a first drainage pipe to the connection joint of the bridge beam. This timely and effective drainage of water accumulated between the expansion joint and the bridge deck pavement layer effectively prevents damage to the asphalt pavement at the expansion joint, extends driving comfort and the service life of the expansion joint, and significantly reduces later maintenance costs.
[0007] Specifically, a first connector is provided at the bottom of the opening side of the water collection trough, and the first connector extends downward into the water collection trough; the first connector is fixedly connected to the bridge beam by a first expansion bolt, and a first gasket is provided between the end of the first connector and the first expansion bolt.
[0008] Preferably, the first connector is provided with a first waterstop strip, which is disposed between the first connector and the bridge beam and fixed by a first expansion bolt. Structural adhesive is applied to the contact surface between the first waterstop strip and the bridge beam. The first waterstop strip can be a water-swellable waterstop strip, and the structural adhesive can be polyurethane adhesive. Applying structural adhesive between the first waterstop strip and the bridge beam increases the connection strength between them. The first waterstop strip between the first connector and the bridge beam further collects seepage water along the first connector, thereby further reducing water infiltration.
[0009] Specifically, the first drain pipe is installed at the bottom of the water collection tank, and the first drain pipe slopes towards the connecting seam.
[0010] Preferably, the drainage pipes are provided in multiple parts, which are evenly arranged along the length of the water collection tank. By providing multiple drainage pipes, the accumulated water in the water collection tank can be smoothly drained away.
[0011] Preferably, the open side of the water collection trough is sealed by a first filter layer, and the end of the drain pipe connected to the water collection trough is sealed by a second filter layer. The first and second filter layers can be made of permeable geotextile. The first and second filter layers can filter impurities in the accumulated water and prevent the water collection trough and the first drain pipe from becoming clogged.
[0012] Preferably, a second connector is provided at the top of the opening side of the water collection trough, the second connector extends upward into the water collection trough, and the second connector is fixed to the asphalt pavement layer by steel nails.
[0013] Preferably, the filler is graded crushed stone with a particle size not exceeding 2 cm.
[0014] Based on the same inventive concept, this application also provides a bridge expansion joint drainage system, including the bridge expansion joint drainage structure as described above, wherein a second waterstop strip is provided at the bottom of the joint, the second waterstop strip being arranged along the width direction of the bridge beam; at least one water collection funnel is provided at the bottom of the second waterstop strip, and a second drainage pipe is provided at the bottom of the water collection funnel, the second drainage pipe being laid downward along the pier below the bridge beam and connected to the bridge deck drainage system.
[0015] The second waterstop strip can be a water-swellable waterstop strip. The seepage water collected in the water collection tank is discharged into the second waterstop strip through the first drainage pipe, and then discharged downwards into the bridge deck drainage system through the water collection funnel and the second drainage pipe. This avoids the corrosion of the bridge's overall appearance and bearing steel plates by rainwater and sewage, ensuring the overall appearance quality of the bridge, protecting the safety of the bridge structure, and extending the service life of the asphalt pavement layer, expansion joints, bearings, and the exterior decoration of the bridge, which can greatly save on bridge maintenance costs.
[0016] Preferably, the second waterstop strip has a zigzag cross-sectional shape, extending to the bottom of the bridge beam on both sides along its width. The second waterstop strip is connected to the bridge beam via second expansion bolts. A second gasket and a metal pressure strip are provided between the ends of the second waterstop strip and the second expansion bolts, with the metal pressure strip positioned adjacent to the second waterstop strip. Structural adhesive is applied to the contact surface between the second waterstop strip and the bridge beam. The structural adhesive can be polyurethane. The zigzag cross-sectional shape of the second waterstop strip allows it to expand and contract along its width, effectively meeting the stress requirements of thermal expansion and contraction of the bridge beam and effectively collecting seepage.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] 1. The bridge expansion joint drainage structure of this utility model, by setting up a water collection trough and a first drainage pipe, can effectively and timely drain the water accumulated between the expansion joint and the bridge deck pavement layer, effectively avoid damage to the asphalt pavement at the expansion joint, extend driving comfort and the service life of the expansion joint, and greatly reduce the later maintenance costs.
[0019] 2. The bridge expansion joint drainage system of this utility model avoids the corrosion of the overall appearance of the bridge and the steel bearing plate by rainwater and sewage, ensuring the overall appearance quality of the bridge, ensuring the safety of the bridge structure, and extending the service life of the asphalt pavement, expansion joint, bearing and the exterior decoration of the bridge, thus greatly saving bridge maintenance costs.
[0020] 3. The bridge expansion joint drainage system of this utility model effectively meets the stress requirements of thermal expansion and contraction of the bridge beam by adopting a second waterstop strip that can expand and contract along the width direction, and effectively collects seepage water. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the drainage structure of the bridge expansion joint of this utility model;
[0022] Figure 2 for Figure 1 A top-view structural diagram;
[0023] Figure 3 for Figure 1 Schematic diagram of the connection structure of the central water tank;
[0024] Figure 4 This is a schematic diagram of the bridge expansion joint drainage system of this utility model;
[0025] Figure 5 for Figure 4 Schematic diagram of the connection structure between the second waterstop strip and the bridge beam;
[0026] Figure 6 for Figure 4 Schematic diagram of the bridge beam structure in the width direction;
[0027] Figure 7 for Figure 6 A schematic diagram of the structure viewed from below.
[0028] In the figure
[0029] 1-Bridge beam; 2-Asphalt pavement layer; 3-Expansion joint; 4-Water collection trough; 5-First drainage pipe; 6-First filter layer; 7-Second filter layer; 8-First connector; 9-First expansion bolt; 10-First waterstop strip; 11-Second connector; 12-Steel nail; 13-Second waterstop strip; 14-Second drainage pipe; 15-Pier column; 16-Second expansion bolt; 17-First gasket; 18-Second gasket; 19-Metal strip; 20-Connection joint; 21-Water collection funnel; 22-Filling material. Detailed Implementation
[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.
[0031] like Figure 1As shown, this embodiment provides a bridge expansion joint drainage structure including a bridge beam 1, an asphalt pavement layer 2 disposed on top of the bridge beam 1, an expansion joint 3 connecting two adjacent sections of the bridge beam 1's top asphalt pavement layer 2, and a water collection trough 4 disposed within the expansion joint 3, the water collection trough 4 extending in the width direction of the bridge beam 1. The water collection trough 4 is a rectangular structure made of stainless steel, 5cm wide, 7cm high, and its length is determined according to the actual site conditions. Figure 3 As shown, the water collection trough 4 is filled with filler 22, which is graded crushed stone with a particle size of 2cm. The open side of the water collection trough 4 is adjacent to the asphalt pavement layer 2, and the bottom of the water collection trough 4 is located below the bottom of the asphalt pavement layer 2. The open side of the water collection trough 4 is sealed with a first filter layer 6, which is made of permeable geotextile. Figure 1 and Figure 3 As shown, a first connector 8 is provided at the bottom of the opening side of the water collection trough 4. The first connector 8 extends downwards from the water collection trough 4 and has a length of 3cm. A first waterstop strip 10 is provided between the first connector 8 and the bridge beam 1. The first connector 8 and the bridge beam 1 are fixedly connected by a first expansion bolt 9, and a first washer 17 is provided between the end of the first connector 8 and the first expansion bolt 9. The first expansion bolt 9 is an M6 type expansion bolt. The first waterstop strip 10 is a water-swellable waterstop strip with a width of 20mm and a thickness of 5mm. Structural adhesive, which is polyurethane adhesive, is applied to the contact surface between the first waterstop strip 10 and the bridge beam 1. A second connector 11 is provided at the top of the opening side of the water collection trough 1. The second connector 11 extends upwards from the water collection trough 4 and has a length of 3cm. The second connector 11 is fixed to the asphalt pavement layer 2 by steel nails 12. Figure 1 and Figure 2 As shown, four first drain pipes 5 are provided on the bottom outer side of the water collection tank 4, and the four first drain pipes 5 are evenly arranged along the length of the water collection tank 4. The first drain pipes 5 are made of PVC pipes with a diameter of 2cm, and the distance between two adjacent first drain pipes 5 is 100cm. Figure 3 As shown, one end of the first drainage pipe 5 connected to the water collection tank 4 is sealed by the second filter layer 7, which is made of permeable geotextile. The first drainage pipe 5 and the permeable geotextile are bonded together with polyurethane adhesive. The first drainage pipe 5 extends into the joint 20 between the adjacent two ends of the bridge beam 1, and the first drainage pipe 5 slopes towards the joint 20.
[0032] like Figure 4 and Figure 6 As shown, this embodiment also provides a bridge expansion joint drainage system including the bridge expansion joint drainage structure described above, wherein a second waterstop strip 13 is provided at the bottom of the connecting joint 20, and the second waterstop strip 13 is arranged along the width direction of the bridge beam 1. Figure 6 and Figure 7 As shown, the bottom of the second waterstop strip 13 is provided with two water collection funnels 21. A second drainage pipe 14 is located at the bottom of each water collection funnel 21. The second drainage pipe 14 is laid downwards along the pier column 15 below the bridge beam 1 and connects to the bridge deck drainage system. The water collection funnels 21 are φ160 PVC rainwater funnels 10 with a top-bottom circular shape, and the second drainage pipe 14 is a DN160 PVC drainage pipe. Figure 4 and Figure 5 As shown, the second waterstop strip 13 has a broken-line cross-sectional shape, extending to the bottom of the bridge beam 1 on both sides along its width. The second waterstop strip 13 is connected to the bridge beam 1 via second expansion bolts 16, which are M6 type expansion bolts. A second washer 18 and a metal pressure strip 19 are provided between the ends of the second waterstop strip 13 and the second expansion bolts 16. The metal pressure strip 19 is made of stainless steel and is 3cm wide. The metal pressure strip 19 is positioned adjacent to the second waterstop strip 13. Structural adhesive, made of polyurethane, is applied to the contact surface between the second waterstop strip 13 and the bridge beam 1. The second waterstop strip 13 is a 5mm thick, expandable, water-swellable waterstop strip with an expandable width of 10cm. Both sides of the second waterstop strip 13 extend outwards by 5cm for connection to the bridge beam 1.
[0033] The installation and use method of the bridge expansion joint drainage system of this utility model is as follows: The water collection trough 4 is filled with graded crushed stone, and the openings on the sides of the water collection trough 4 are sealed with permeable geotextile. The upper end of the water collection trough 4 is fixed to the asphalt pavement layer 2 with steel nails 12. First, polyurethane adhesive is applied to the bridge beam 1, and the water-swellable sealing strip is then adhered to the bridge beam 1. The lower end of the water collection trough 4 is tightly attached to the water-swellable sealing strip, and then fixed to the bridge beam 1 with expansion bolts. A first drainage pipe 5 is inserted into the hole at the bottom of the water collection trough 4, and the end of the first drainage pipe 5 is sealed with permeable geotextile. Polyurethane adhesive is applied to the bottom of the bridge beam 1 on both sides of the bottom of the joint 20 to bond the expansion-type water-swellable sealing strip. Then, a stainless steel pressure strip is used to tightly press the expansion-type water-swellable sealing strip, and finally, the stainless steel pressure strip and the expansion-type water-swellable sealing strip are fixed to the bridge beam 1 with expansion bolts. After installing the water collection funnel 21, collect the water accumulated at the telescopic water-swellable waterstop strip, and then connect the second drain pipe 14 under the water collection funnel 21 to discharge the accumulated water to the bridge deck drainage system.
[0034] By setting up a water collection trough 4 to collect seepage water in the asphalt pavement layer 2 and seepage water between the asphalt pavement layer 2 and the expansion joint 3, and draining it into the connection joint 20 of the bridge beam 1 through the first drainage pipe 5, the accumulated water in the connection joint 20 is discharged downward into the bridge deck drainage system through the second waterstop strip 13, the water collection funnel 21 and the second drainage pipe 14, thereby avoiding the corrosion of the overall appearance of the bridge and the bearing steel plate by rainwater and sewage, ensuring the overall appearance quality of the bridge, ensuring the safety of the bridge structure, and extending the service life of the asphalt pavement layer, expansion joint, bearing and the exterior surface decoration of the bridge, which can greatly save bridge maintenance costs.
[0035] The above embodiments should be understood as being used only to illustrate the utility model more clearly, and not to limit the scope of the utility model. After reading this utility model, any modifications of the embodiments by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.
Claims
1. A bridge expansion joint drainage structure, comprising a bridge girder (1), an asphalt pavement (2) arranged on the top of the bridge girder (1), and an expansion joint (3) connecting the asphalt pavements (2) on the top of the two adjacent bridge girders (1), characterized in that: It also includes a water collection trough (4) installed in the expansion joint (3), which extends in the width direction of the bridge beam (1), and the water collection trough (4) is filled with filler (22); The opening side of the water collection trough (4) is located close to the asphalt pavement layer (2), and the bottom of the water collection trough (4) is located below the bottom of the asphalt pavement layer (2). The bottom of the water collection trough (4) is fixedly connected to the bridge beam (1), and the top of the water collection trough (4) is fixedly connected to the asphalt pavement layer (2); The water collection trough (4) is provided with a first drain pipe (5), which extends into the joint (20) between two adjacent bridge beams (1).
2. The bridge joint drainage structure according to claim 1, characterized in that: The bottom of the opening side of the water collection tank (4) is provided with a first connector (8), which extends downward into the water collection tank (4); the first connector (8) is fixedly connected to the bridge beam (1) by a first expansion bolt (9), and a first gasket (17) is provided between the end of the first connector (8) and the first expansion bolt (9).
3. The bridge joint drainage structure according to claim 2, characterized in that: The first connector (8) is provided with a first waterstop strip (10), which is located between the first connector (8) and the bridge beam (1) and is fixed by a first expansion bolt (9). Structural adhesive is provided on the contact surface between the first waterstop strip (10) and the bridge beam (1).
4. The bridge joint drainage structure according to claim 1, characterized by: The first drain pipe (5) is located at the bottom of the water collection tank (4), and the first drain pipe (5) slopes towards the connecting seam (20).
5. The bridge joint drainage structure according to claim 4, characterized in that: The drainage pipe (5) is provided in multiple parts, and the multiple drainage pipes (5) are evenly arranged along the length of the water collection tank (4).
6. The bridge joint drainage structure according to claim 1, characterized in that: The opening side of the water collection tank (4) is sealed by the first filter layer (6), and the end of the drain pipe (5) connected to the water collection tank (4) is sealed by the second filter layer (7).
7. The bridge joint drainage structure according to claim 1, characterized by: The top of the opening side of the water collection trough (4) is provided with a second connector (11), which extends upwards from the water collection trough (4). The second connector (11) is fixed to the asphalt pavement layer (2) by steel nails (12).
8. The bridge expansion joint drainage structure according to claim 1, characterized in that: The filler (22) is graded crushed stone with a particle size not exceeding 2 cm.
9. A bridge joint drainage system characterized by: The bridge expansion joint drainage structure includes any one of claims 1 to 8, wherein the bottom of the connecting joint (20) is provided with a second waterstop strip (13), which is provided along the width direction of the bridge beam (1); at least one water collection funnel (21) is provided at the bottom of the second waterstop strip (13), and a second drainage pipe (14) is provided at the bottom of the water collection funnel (21), which is laid down along the pier (15) below the bridge beam (1) and connected to the bridge deck drainage system.
10. The bridge joint drainage system of claim 9, wherein: The second waterstop strip (13) has a broken cross-sectional shape. The second waterstop strip (13) extends to the bottom of the bridge beam (1) on both sides along the width direction. The second waterstop strip (13) is connected to the bridge beam (1) by the second expansion bolt (16). A second gasket (18) and a metal pressure strip (19) are provided between the ends of the second waterstop strip (13) and the second expansion bolt (16). The metal pressure strip (19) is set close to the second waterstop strip (13). Structural adhesive is provided on the contact surface between the second waterstop strip (13) and the bridge beam (1).