Viaduct drainage system and viaduct suitable for areas with frequent short-time rapid rainfall
By connecting the longitudinal drainage ditch on the elevated bridge deck with the water collection well on the pier, the problem of untimely rainwater drainage on the bridge deck in areas with short-term heavy rainfall is solved, achieving efficient rainwater drainage and traffic safety, convenient maintenance, and no impact on the landscape.
Patent Information
- Application Number
- CN202511172848.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-21
- Publication Date
- 2025-11-18
AI Technical Summary
Existing urban elevated bridges in areas with short-term heavy rainfall have rainwater drainage systems that cannot drain water in time, which can easily lead to traffic accidents and reduced traffic efficiency due to blockage by debris.
Longitudinal drainage ditches are set up on both sides of the viaduct and water collection wells are set up at the piers. The water collection wells are connected to the downpipes to increase the redundancy of the drainage system. Non-linear drainage ditches are used to block debris. The water collection wells are embedded in the reinforced concrete layer. The drainage ditches are flush with the bridge deck and the downpipes are connected to the ground.
It can temporarily store rainwater during short-term heavy rainfall, reduce drainage pressure at the bridge piers, improve drainage efficiency, prevent blockages, facilitate maintenance, and not affect the landscape effect.
Smart Images
Figure CN120967800A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of bridge design and construction, and is suitable for urban viaducts, especially for the drainage system of viaducts in short-time heavy rainfall areas. BACKGROUND
[0002] In the construction of urban bridges, bridge deck drainage is a key problem in bridge auxiliary engineering, especially for viaducts in rainy areas and short-time heavy rainfall areas. The bridge deck rainwater cannot be discharged in time, which reduces the traffic efficiency of the expressway, increases the probability of traffic accidents, and causes adverse social impacts.
[0003] The current bridge deck drainage method commonly used in urban viaducts is to set a water collecting well at the position of the bridge pier, to collect the rainwater on the bridge deck through the longitudinal and transverse slopes, and to discharge the rainwater into the ground drainage system through the downspout connected to the lower part of the water collecting well. This drainage system can meet the drainage needs of the bridge deck rainwater in most cases, but in short-time heavy rainfall areas, the rainfall is heavy in a short time, and the water collecting well at the position of the bridge pier cannot meet the drainage needs of the bridge deck rainwater. If the water collecting well is blocked by road garbage and other debris, the bridge deck rainwater cannot be discharged for a long time. SUMMARY
[0004] The purpose of the present application is to provide a viaduct drainage system suitable for short-time heavy rainfall areas, which uses a longitudinally arranged drainage ditch as a temporary water storage buffer measure for the bridge deck and adds a water collecting well to ensure the smooth discharge of rainwater, further meets the drainage needs of the bridge deck rainwater in short-time heavy rainfall, and is convenient for later maintenance and can be applied to viaduct engineering in short-time heavy rainfall areas.
[0005] Technical scheme of the present application
[0006] In the first aspect, the present application provides a viaduct drainage system suitable for short-time heavy rainfall areas, which uses the following technical scheme:
[0007] A viaduct drainage system suitable for short-time heavy rainfall areas, comprising a drainage ditch, a water collecting well and a downspout, the drainage ditch is arranged along the length direction of the viaduct deck, the height of the drainage ditch is consistent with the height of the asphalt concrete layer of the bridge deck, the drainage ditch can collect the rainwater on the viaduct deck and temporarily store water; the water collecting well is pre-buried in the reinforced concrete layer of the bridge pier, the water outlet of the drainage ditch is connected with the water collecting well, and at the same time, the water collecting well can collect part of the rainwater on the viaduct deck; the downspout is connected below the water collecting well, and the end of the downspout away from the water collecting well is arranged on the ground and used for the discharge of rainwater.
[0008] Optionally, two water collecting wells are respectively arranged at each pier, and the two water collecting wells are connected to the same downpipe.
[0009] Optionally, the two water collecting wells are respectively arranged at the front and back sides of the pier.
[0010] Optionally, the top ends of the drainage ditch and the water collecting well are flush with the elevated bridge deck.
[0011] Optionally, the drainage ditch is a non-linear drainage ditch.
[0012] Optionally, the side wall of the drainage ditch is provided with water-permeable openings for draining the water accumulated in the asphalt concrete layer.
[0013] In a second aspect, the application provides an elevated bridge adopting the following technical solution.
[0014] An elevated bridge comprises a bridge body, and a crash barrier is arranged on each side of the bridge body along the length direction of the elevated bridge deck. The elevated bridge further comprises the elevated bridge drainage system for short-time heavy rain areas as described above, and the drainage ditch is arranged in parallel below the inner side of the crash barrier.
[0015] Beneficial technical effects of the application
[0016] 1. By arranging the drainage ditch along the length of the elevated bridge deck, the drainage ditch can temporarily store part of the rainwater on the bridge deck during short-time heavy rain, thereby reducing the water collecting and drainage pressure of the water collecting well at the pier position.
[0017] 2. By arranging two water collecting wells at each pier position in the longitudinal direction of the bridge, the two water collecting wells can increase the redundancy of the elevated bridge deck drainage system, and the drainage system can still operate normally even if one of the water collecting wells is blocked by garbage on the bridge deck.
[0018] 3. By connecting the two water collecting wells below to one vertical downpipe, the downpipe does not need to be additionally increased, and the landscape effect under the bridge is not affected.
[0019] 4. The side wall of the drainage ditch is provided with water-permeable openings, which facilitates the drainage of the water accumulated in the asphalt concrete layer.
[0020] 5. The drainage ditch and the water collecting well are both conventional products, and the maintenance and repair are convenient. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 FIG. 1 is a cross-sectional view of the elevated bridge drainage system and the elevated bridge according to the application;
[0022] Figure 2 FIG. 2 is a front view of the drainage ditch according to the application;
[0023] Figure 3This is a top view of the drainage ditch in an embodiment of this application;
[0024] Figure 4 This is a side view of the drainage ditch in an embodiment of this application;
[0025] Figure 5 This is a cross-sectional view of the drainage system of the elevated bridge in an embodiment of this application;
[0026] Figure 6 This is a plan view of the drainage system of the elevated bridge in the embodiments of this application;
[0027] Figure 7 This is an elevation view of the drainage system of the elevated bridge located at the middle pier in an embodiment of this application;
[0028] Figure 8 This is an elevation view of the drainage system of the elevated bridge located at the side pier in an embodiment of this application.
[0029] Attached reference numerals: 1. Drainage ditch; 11. Cover plate; 12. Partition plate; 13. Grille; 2. Sump; 3. Downpipe; 4. Ground municipal drainage system; 5. Elevated bridge deck; 51. Asphalt concrete layer; 52. Reinforced concrete layer; 6. Pier; 7. Crash barrier. Detailed Implementation
[0030] The following is in conjunction with the appendix Figures 1-8 The present invention will be further described in detail with reference to specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention.
[0031] This embodiment discloses a drainage system for elevated bridges suitable for areas prone to short-term, rapid rainfall, referring to... Figure 1 The system includes a drainage ditch 1, a collection well 2, and a downpipe 3. The drainage ditch 1 is set along the length of the viaduct surface 5. The drainage ditch 1 can not only collect rainwater from the viaduct surface 5, but also has the function of temporary water storage. The collection well 2 is located at the pier 6. The outlet of the drainage ditch 1 is connected to the collection well 2, and the rainwater collected by the drainage ditch 1 flows into the collection well 2. At the same time, the collection well 2 can collect some of the rainwater from the viaduct surface 5. The downpipe 3 is connected to the bottom of the collection well 2. The end of the downpipe 3 away from the collection well 2 is set on the ground for rainwater discharge.
[0032] During periods of heavy rainfall, some rainwater from the elevated bridge deck 5 flows into the collection well 2 through the drainage ditch 1, while some flows directly into the collection well 2. The rainwater then collects in the downpipe 3 through the collection well 2 and is eventually discharged into the municipal drainage system 4. The drainage ditch 1 can temporarily store rainwater from the elevated bridge deck 5 during heavy rainfall, reducing the pressure on the collection well 2 at the bridge pier 6 and the drainage from the downpipe 3, thus meeting the rainwater discharge needs of the bridge deck during periods of heavy rainfall.
[0033] Referring to Figure 2 and Figure 3 , the drainage ditch 1 adopts a nonlinear drainage ditch, and the drainage ditch 1 has a "N" shape structure including a cover plate 11 and two oppositely arranged baffle plates 12. The cover plate 11 is provided with wave-shaped gratings 13, and the distance between adjacent gratings 13 is 5 mm. The nonlinear drainage ditch 1 can effectively block debris, fallen leaves and other sundries from falling into the drainage ditch 1, effectively avoiding blockage, and at the same time has a certain pressure resistance.
[0034] Referring to Figure 4 and Figure 5 , the drainage ditch 1 is installed in the bridge deck asphalt concrete layer 51, the height of the drainage ditch 1 is consistent with the height of the asphalt concrete layer 51, and the top end of the cover plate 11 is flush with the elevated bridge deck 5. The baffle plate 12 has an opening for water permeability, and the accumulated water in the asphalt concrete layer 51 can be directly drained into the drainage ditch 1.
[0035] Referring to Figure 5 and Figure 6 , the water collecting well 2 is pre-buried in the reinforced concrete layer 52 during the construction of the bridge deck, and a connecting port is reserved for connection with the drainage ditch 1. Referring to Figure 7 and Figure 8 , the water collecting well 2 is provided with two, and the two water collecting wells 2 are respectively located on the front and rear sides of the bridge pier 6 along the length direction of the bridge deck; the top end of the water collecting well 2 is flush with the elevated bridge deck 5, and the water outlets of the two water collecting wells 2 are connected to the same vertically arranged downpipe 3. The two water collecting wells 2 can increase the redundancy of the bridge deck drainage system, and if one of the water collecting wells 2 is blocked by the bridge deck garbage, it can also operate normally; and the two water collecting wells 2 are connected to the same vertical downpipe 3, without the need to additionally increase the downpipe 3, without affecting the landscape effect under the bridge.
[0036] In this embodiment, the water collecting well 2 adopts a cast iron water collecting well 2, the downpipe 3 adopts a PVC-U drainage pipe, and is fixed by a self-anchored pipe clamp; the structure of the nonlinear drainage ditch 1 is only a finished product display, and in the actual use process, the drainage ditch 1 and the water collecting well 2 can be purchased according to the actual situation. The applicable market finished product is convenient for maintenance and replacement.
[0037] The present application is applicable to the construction of the elevated bridge drainage system and the bridge deck auxiliary engineering in the short-time heavy rainfall area, and the specific implementation method is as follows:
[0038] First step: when the bridge deck reinforced concrete layer 52 is paved, cast iron water collecting wells 2 are pre-buried on the front and rear sides of the bridge pier 6, and the direction of the drainage ditch 1 is marked and positioned;
[0039] Second step: after the bridge deck reinforced concrete layer 52 is paved, the asphalt concrete layer 51 and the crash barrier 7 are constructed, and the interface for butt joint with the drainage ditch 1 is reserved;
[0040] Third step: cutting the asphalt concrete layer 51 along the crash barrier 7 for a certain distance, installing the drainage ditch 1, and connecting the drainage ditch 1 with the cast iron water collecting well 2 through a component;
[0041] Fourth step: connecting the water outlet below the water collecting well 2 with the downspout 3;
[0042] Fifth step: completing the construction of other elevated bridge deck 5 auxiliary projects.
[0043] The implementation principle of the elevated bridge drainage system suitable for short-time heavy rain-prone areas disclosed by the embodiment of the application is as follows: when short-time heavy rain occurs, part of the rainwater on the elevated bridge deck 5 flows into the water collecting well 2 through the nonlinear drainage ditch 1, and the other part of the rainwater directly flows into the water collecting well 2, the rainwater is collected in the downspout 3 through the water collecting well 2, and finally is discharged into the ground municipal drainage system 4; the application only occupies a small part of the space of the elevated bridge deck 5 to complete the layout of the urban elevated bridge drainage system, and has a good improvement effect on the problem of untimely drainage of the elevated bridge deck 5 caused by short-time heavy rain.
[0044] The embodiment of the application further discloses an elevated bridge, which comprises a bridge body and the above-mentioned elevated bridge drainage system suitable for short-time heavy rain-prone areas, and the crash barrier 7 is arranged on both sides of the bridge body along the length direction of the elevated bridge deck 5, and the drainage ditch 1 is arranged in parallel below the inner side of the crash barrier 7.
[0045] Taking an elevated bridge in a southern city as an example, the bridge deck is 25.5 m wide, has a six-lane scale in both directions, the upper structure mainly adopts cast-in-place prestressed concrete large box girder, and the lower structure is a double-column vase pier. The elevated bridge adopts the scheme of the application, the drainage ditch 1 is arranged along the inner side of the crash barrier 7, the drainage ditch 1 with a width of 120 mm and a height of 90 mm is connected to the cast iron water collecting well 2, and the cast iron water collecting well 2 is arranged on the longitudinal two sides of each pier 6, respectively, a PVC downspout 3 with a diameter of 200 mm is arranged below the cast iron water collecting well 2 and connected to the ground municipal drainage system 4. When facing short-time heavy rain, the water accumulation elimination time of the elevated bridge deck 5 is shortened, and the drainage efficiency is significantly improved.
[0046] Although the content of the application has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the application. After reading the above content, various modifications and substitutions of the application will be obvious to those skilled in the art. Therefore, the protection scope of the application should be defined by the appended claims.
Claims
1. A drainage system for viaducts suitable for use in areas where short, intense and frequent rainfalls occur, characterized in that, The system comprises a drainage ditch (1), a water collecting well (2) and a downspout (3), the drainage ditch (1) is arranged along the length direction of the viaduct deck (5), the height of the drainage ditch (1) is consistent with the height of the asphalt concrete layer (51) of the deck, the drainage ditch (1) can collect the rainwater of the viaduct deck (5) and temporarily store water; the water collecting well (2) is embedded in the reinforced concrete layer (52) of the pier (6), the water outlet of the drainage ditch (1) is connected with the water collecting well (2), and meanwhile the water collecting well (2) can collect part of the rainwater of the viaduct deck (5); the downspout (3) is connected below the water collecting well (2), and the end of the downspout (3) away from the water collecting well (2) is arranged on the ground and used for discharging rainwater.
2. The elevated bridge drainage system according to claim 1, wherein Two water collecting wells (2) are arranged at each pier (6) respectively, and the two water collecting wells (2) are connected to the same downspout (3).
3. The bridge drainage system according to claim 2, wherein, The two water collecting wells (2) are respectively located on the front and back sides of the pier (6).
4. The elevated bridge drainage system according to claim 1, wherein, The top end of the drainage ditch (1) and the top end of the water collecting well (2) are flush with the viaduct deck (5).
5. The elevated bridge drainage system according to claim 1, wherein The drainage ditch (1) is a non-linear drainage ditch (1).
6. The bridge drainage system according to claim 5, wherein The side wall of the drainage ditch (1) is provided with water-permeable openings, and the openings are used for draining the accumulated water of the asphalt concrete layer (51).
7. A viaduct comprising a bridge body, both sides of the bridge body are respectively provided with a crash barrier (7) along the length direction of a viaduct deck (5), characterized in that, The system further comprises the drainage system for viaduct bridge in short-time heavy rain area according to any one of claims 1-6, and the drainage ditch (1) is arranged in parallel below the inner side of the crash barrier (7).