A drainage system for elevated bridges and elevated bridges suitable for areas prone to short-term heavy rainfall.

Abstract

This application relates to the technical field of bridge design and construction, specifically disclosing a drainage system and viaduct applicable to areas prone to short-duration, rapid rainfall. The system includes drainage ditches, collection wells, and downpipes. The drainage ditches are installed along the length of the viaduct deck, with their height matching the height of the asphalt concrete layer. The drainage ditches collect rainwater from the viaduct deck and provide temporary storage. The collection wells are embedded in the reinforced concrete layer of the bridge piers, and the outlets of the drainage ditches are connected to the collection wells, which also collect a portion of the rainwater from the viaduct deck. Downpipes are connected below the collection wells, with one end of the downpipe furthest from the collection well positioned on the ground for rainwater discharge. This application features a simple overall structure, occupying only a small portion of the viaduct deck space to complete the urban viaduct drainage system. Furthermore, the drainage ditches can temporarily store some rainwater from the viaduct deck, improving drainage efficiency during short-duration, rapid rainfall and meeting the rainwater discharge needs of the bridge deck during such events.

Description

Technical Field

[0001] This application belongs to the technical field of bridge design and construction, and is applicable to urban elevated bridges, especially drainage systems and viaducts in areas with frequent short-term heavy rainfall. Background Technology

[0002] In the construction of urban bridges, bridge deck drainage is a key issue in bridge ancillary works. Especially for elevated bridges in rainy areas and areas with frequent short-term heavy rainfall, rainwater often cannot be drained from the bridge deck in time, which leads to reduced expressway traffic efficiency, increased probability of traffic accidents, and adverse social impacts.

[0003] Currently, the common method for drainage on urban elevated bridges is to install collection wells at the bridge piers. Rainwater is collected into these wells via longitudinal and transverse slopes on the bridge deck, and then discharged into the ground drainage system through downpipes connected to the bottom of the wells. This type of drainage system can meet the rainwater discharge needs of elevated bridge decks in most cases. However, in areas with frequent short-term heavy rainfall, the large amount of rainfall in a short period of time cannot be met by relying solely on the collection wells at the bridge piers. If the collection wells are blocked by road debris or other garbage, rainwater may be unable to drain from the bridge deck for an extended period of time. Utility Model Content

[0004] The purpose of this application is to provide a drainage system and viaduct suitable for areas with frequent short-term heavy rainfall. While ensuring that the traffic function and landscape effect of urban bridges are not affected, the system adopts longitudinally arranged drainage ditches as temporary water storage and buffer measures for the bridge surface, and adds water collection wells to ensure unobstructed rainwater discharge. This further meets the needs of rainwater discharge from the bridge surface under short-term heavy rainfall, and facilitates later inspection and maintenance. It is applicable to viaduct projects in areas with frequent short-term heavy rainfall.

[0005] The technical solution of this application

[0006] Firstly, this application provides a drainage system for elevated bridges suitable for areas prone to short-term, rapid rainfall, employing the following technical solution:

[0007] A drainage system for elevated bridges in areas prone to short-term, rapid rainfall includes a drainage ditch, a collection well, and a downpipe. The drainage ditch is installed along the length of the elevated bridge deck, and its height is the same as the height of the asphalt concrete layer of the bridge deck. The drainage ditch can collect rainwater from the elevated bridge deck and provide temporary water storage. The collection well is embedded in the reinforced concrete layer of the bridge piers, and the outlet of the drainage ditch is connected to the collection well. The collection well can also collect a portion of the rainwater from the elevated bridge deck. The downpipe is connected below the collection well, and its end away from the collection well is located on the ground for rainwater discharge.

[0008] Optionally, each pier is provided with two water collection wells, and the two water collection wells are connected to the same downpipe.

[0009] Optionally, the two water collection wells are located on the front and rear sides of the bridge pier, respectively.

[0010] Optionally, the top of the drainage ditch and the top of the water collection well are flush with the surface of the viaduct.

[0011] Optionally, the drainage ditch may be a non-linear drainage ditch.

[0012] Optionally, the sidewall of the drainage ditch has permeable openings for draining water from the asphalt concrete layer.

[0013] Secondly, this application provides an elevated bridge, which adopts the following technical solution:

[0014] An elevated bridge includes a bridge body, with crash barriers installed on both sides of the bridge body along the length of the elevated bridge deck, and also includes the aforementioned drainage system for elevated bridges in areas prone to short-term heavy rainfall, wherein the drainage ditch is arranged parallel to the inner side below the crash barriers.

[0015] Beneficial technical effects of this application

[0016] 1. By setting up continuous drainage ditches on both sides of the viaduct, the drainage ditches can temporarily store some of the rainwater on the bridge surface during short-term heavy rainfall, reducing the pressure on the water collection and drainage wells at the bridge piers;

[0017] 2. By setting two water collection wells in the longitudinal direction at each pier location, the redundancy of the elevated bridge deck drainage system can be increased. Even if one of the water collection wells is blocked by debris on the bridge deck, it can still operate normally.

[0018] 3. By connecting the two water collection wells to a vertical downpipe, no additional downpipe is needed, and the landscape effect under the bridge is not affected;

[0019] 4. The sidewalls of the drainage ditch have permeable openings to facilitate the drainage of water accumulated in the asphalt concrete layer.

[0020] 5. Drainage ditches and water collection wells are all standard products, which are easy to maintain and repair. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the drainage system for the elevated bridge and the cross-section of the elevated bridge according to an embodiment of this application;

[0022] Figure 2 This is a front view of the drainage ditch in an embodiment of this 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 Figure 1-8 The present application 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 illustration of the embodiments of the present application.

[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] Reference Figure 2 and Figure 3 The drainage ditch 1 is a non-linear drainage ditch with a "U"-shaped structure, including a cover plate 11 and two opposing partitions 12; the cover plate 11 is provided with a wavy grid 13, with a spacing of 5mm between adjacent grids 13. The non-linear drainage ditch 1 can effectively prevent debris such as gravel and fallen leaves from falling into the drainage ditch 1, effectively avoiding blockage, and also has a certain pressure resistance.

[0034] Reference Figure 4 and Figure 5 The drainage ditch 1 is installed in the asphalt concrete layer 51 of the bridge deck. The height of the drainage ditch 1 is the same as the height of the asphalt concrete layer 51, and the top of the cover plate 11 is flush with the viaduct deck 5. The partition plate 12 has openings to allow water to pass through, so that the water accumulated in the asphalt concrete layer 51 can be directly discharged into the drainage ditch 1.

[0035] Reference Figure 5 and Figure 6 The water collection well 2 is pre-embedded in the reinforced concrete layer 52 during bridge deck construction, and a connection port is reserved for connection with the drainage ditch 1. (Refer to...) Figure 7 and Figure 8 Two water collection wells 2 are provided, located on the front and rear sides of the pier 6 along the length of the bridge deck, respectively. The top of the water collection wells 2 is flush with the viaduct deck 5, and the outlets of the two water collection wells 2 are connected to the same vertical downpipe 3. The two water collection wells 2 increase the redundancy of the bridge deck drainage system, and can still operate normally even if one of the water collection wells 2 is blocked by debris on the bridge deck. Furthermore, the two water collection wells 2 are connected to the same vertical downpipe 3, eliminating the need for additional downpipe 3 and not affecting the landscape effect under the bridge.

[0036] In this embodiment, the water collection well 2 is made of cast iron, and the downpipe 3 is made of PVC-U drainage pipe and is fixed by self-anchoring pipe clamps; the structure of the nonlinear drainage ditch 1 is only a finished product for display. In actual use, both drainage ditch 1 and water collection well 2 can be purchased from commercially available finished products according to the actual situation, which is convenient for maintenance and replacement.

[0037] This application applies to the simultaneous construction of drainage systems for elevated bridges and bridge deck ancillary works in areas prone to short-term, rapid rainfall. The specific implementation method is as follows:

[0038] Step 1: During the construction of the reinforced concrete layer 52 of the bridge deck, cast iron water collection wells 2 are pre-embedded on both the front and rear sides of the bridge pier 6, and the direction of the positioning drainage ditch 1 is marked.

[0039] Step 2: After the reinforced concrete layer 52 of the bridge deck is paved, the asphalt concrete layer 51 and the crash barrier 7 will be constructed, and an interface for connecting to the drainage ditch 1 will be reserved.

[0040] Step 3: Cut the asphalt concrete layer 51 at a certain distance inward along the crash barrier 7, install the drainage ditch 1, and connect the drainage ditch 1 to the cast iron water collection well 2 through the components;

[0041] Step 4: Connect the water outlet at the bottom of the water collection well 2 to the downpipe 3;

[0042] Step 5: Complete the construction of other ancillary works for the elevated bridge deck.

[0043] The implementation principle of the elevated bridge drainage system disclosed in this application, applicable to areas with frequent short-term heavy rainfall, is as follows: When short-term heavy rainfall occurs, part of the rainwater on the elevated bridge surface 5 flows into the collection well 2 through the nonlinear drainage ditch 1, and the other part flows directly into the collection well 2. The rainwater is collected in the downpipe 3 through the collection well 2 and finally discharged into the ground municipal drainage system 4. This application occupies only a small portion of the space on the elevated bridge surface 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 surface 5 due to short-term heavy rainfall.

[0044] This application also discloses an elevated bridge, including a bridge body and the above-mentioned drainage system for elevated bridges in areas with frequent short-term heavy rainfall. Anti-collision walls 7 are installed on both sides of the bridge body along the length of the elevated bridge surface 5, and drainage ditch 1 is arranged parallel to the inner side below the anti-collision walls 7.

[0045] Taking an elevated bridge in a southern city as an example, the bridge deck is 25.5m wide, with six lanes in both directions. The superstructure mainly adopts cast-in-place prestressed concrete box girders, and the substructure consists of double-column vase piers. The elevated bridge adopts the scheme described in this application, with drainage ditches 1 set along the inner side of the crash barrier 7. These 120mm (width) × 90mm (height) drainage ditches 1 connect to cast iron collection wells 2. Cast iron collection wells 2 are also arranged on both sides of each pier 6 longitudinally. PVC downpipes 3 with a diameter of 200mm are installed under the cast iron collection wells 2, connecting to the ground municipal drainage system 4. When facing short-term heavy rainfall, the time for water to dissipate on the elevated bridge deck 5 is shortened, and drainage efficiency is significantly improved.

[0046] Although the content of this application has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of this application. Various modifications and substitutions to this application will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of this 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 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 (5), and the height of the drainage ditch (1) is the same as the height of the asphalt concrete layer (51) of the bridge deck. The drainage ditch (1) can collect rainwater from the viaduct (5) and store it temporarily. The collection well (2) is embedded in the reinforced concrete layer (52) of the pier (6). The outlet of the drainage ditch (1) is connected to the collection well (2), and the collection well (2) can collect some of the rainwater from the viaduct (5). The downpipe (3) is connected below the collection well (2), and the end of the downpipe (3) away from the collection well (2) is set on the ground and used for rainwater discharge.

2. The elevated bridge drainage system according to claim 1, wherein Two water collection wells (2) are provided at each pier (6), and the two water collection wells (2) are connected to the same downpipe (3).

3. The elevated bridge drainage system according to claim 2, wherein, The two water collection wells (2) are located on the front and rear sides of the bridge pier (6), respectively.

4. The elevated bridge drainage system according to claim 1, wherein, The top of the drainage ditch (1) and the top of the water collection well (2) are flush with the viaduct surface (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 drainage ditch (1) has permeable openings on its sidewalls for draining water from 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, It also includes a drainage system for elevated bridges in areas with frequent short-term heavy rainfall as described in any one of claims 1-6, wherein the drainage ditch (1) is arranged parallel to the inner side below the crash barrier (7).

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