Drainage structure for highway superhigh section

Abstract

The application relates to the technical field of road drainage, and discloses a highway superhigh section drainage structure, which comprises a highway superhigh section and a roadbed drainage ditch, the roadbed drainage ditch is located on the side with lower slope of the highway superhigh section, and the highway superhigh section is provided with a middle separation belt; a plurality of water collecting wells are embedded in the highway superhigh section, the water collecting wells are located outside the middle separation belt, adjacent water collecting wells are connected through drainage open ditches, the water collecting wells and the drainage open ditches are arranged below the road surface of the highway superhigh section, and the water collecting wells are all connected with transverse drainage pipes, the transverse drainage pipes are embedded in the highway superhigh section, and the transverse drainage pipes are connected with the roadbed drainage ditch. The application has the effect of facilitating drainage outside the middle separation belt of the highway superhigh section.

Description

Technical Field

[0001] This application relates to the technical field of road drainage, and in particular to a drainage structure for superelevated highway sections. Background Technology

[0002] like Figure 1 Superelevation sections 1 on highways are typically unidirectional transverse slopes, with the entire cross-section tilted to one side to facilitate the drainage of water accumulated on the road surface into the roadbed drainage ditch 2 using the road surface slope.

[0003] In related technologies, a median strip is typically installed in the middle of superelevation sections of highways as part of the design. Due to the presence of the median strip, transverse drainage pipes are usually installed at the median strip to facilitate the drainage of rainwater from the outer side (the side with the steeper slope of the superelevation section). During rainy weather, rainwater located outside the median strip is discharged through these transverse drainage pipes.

[0004] Regarding the aforementioned technologies, rainwater often carries debris, causing blockages in the transverse drainage pipes of the median strip. This leads to drainage compensation, resulting in rainwater easily accumulating on the asphalt pavement outside the median strip. This significantly reduces the service life of the asphalt pavement and increases unnecessary repair and maintenance costs throughout the pavement's lifespan. Therefore, there is room for improvement. Utility Model Content

[0005] To facilitate the smooth discharge of rainwater outside the median strip in superelevated road sections, this application provides a drainage structure for superelevated road sections.

[0006] This application provides a drainage structure for superelevated highway sections, employing the following technical solution: A drainage structure for a superelevated highway section includes the superelevated section and a roadbed drainage ditch. The roadbed drainage ditch is located on the side of the superelevated section with a lower slope. The superelevated section has a median strip. Several collection wells are buried in the superelevated section, located outside the median strip. Adjacent collection wells are connected by an open drainage ditch. Both the collection wells and the open drainage ditch are set below the road surface of the superelevated section. Each collection well is connected to a transverse drainage pipe, which is buried within the superelevated section and connected to the roadbed drainage ditch.

[0007] By adopting the above technical solution, rainwater outside the median strip can be collected in the sump through the drainage ditch, and then flow to the roadbed drainage ditch through the transverse drainage pipe. This effectively reduces the water accumulation on the road surface outside the median strip, reduces the asphalt pavement from being soaked in rainwater for a long time, helps to extend the service life of the asphalt pavement, and reduces the cost of road repair and maintenance.

[0008] Preferably, both the water collection well and the drainage ditch are covered with a cover plate, and the top of the cover plate has several drainage holes.

[0009] By adopting the above technical solution, rainwater can enter the collection well and drainage ditch through the drainage holes on the top of the cover plate. At the same time, the cover plate can intercept debris, preventing debris from directly entering the collection well and drainage ditch and causing blockage of the drainage ditch.

[0010] Preferably, auxiliary drainage notches are provided at both ends of the cover plate, and the auxiliary drainage notches at the adjacent ends of the cover plates are spliced ​​together to form an auxiliary drainage hole.

[0011] By adopting the above technical solution, auxiliary drainage holes are formed by splicing the adjacent ends of the cover plates, which helps to increase the drainage channels of the cover plates and facilitates rainwater to flow better into the drainage ditch through the cover plates.

[0012] Preferably, a drainage blind ditch is also provided within the asphalt layer of the superelevation section of the highway. The drainage blind ditch is located on the side of the drainage open ditch away from the median strip, and is connected to the drainage open ditch.

[0013] By adopting the above technical solution, rainwater in the asphalt layer on the road surface can be discharged into the open drainage ditch through the drainage blind ditch, further reducing the occurrence of water accumulation on the road surface.

[0014] Preferably, a perforated PVC pipe is buried in the drainage ditch, and the perforated PVC pipe is surrounded by a layer of gravel.

[0015] By adopting the above technical solution, the perforated PVC pipe is used to form a water storage and drainage channel in the drainage blind ditch, which is conducive to the more concentrated and smooth drainage of water accumulated in the asphalt layer of the highway into the drainage open ditch through the drainage blind ditch; the setting of the crushed stone layer is conducive to intercepting sand and gravel debris carried by rainwater, reducing the situation where sand and gravel debris block the permeable holes on the outer periphery of the perforated PVC pipe.

[0016] Preferably, a drainage groove is provided at the top end of the drainage ditch, and the two ends of the drainage groove are respectively connected to the inner cavity of the drainage ditch and the inner cavity of the drainage blind ditch.

[0017] By adopting the above technical solution, the drainage channel connects the open drainage ditch and the blind drainage ditch, making it easier for rainwater in the blind drainage ditch to flow into the open drainage ditch through the drainage channel.

[0018] Preferably, a reverse filter geotextile is laid inside the drainage blind ditch, and the reverse filter geotextile wraps around the crushed stone layer.

[0019] By adopting the above technical solution, the reverse filter geotextile can be used to isolate the crushed stone cushion layer from the asphalt concrete layer. During highway asphalt elevation measurement construction, the reverse filter geotextile can be used to limit the asphalt from blocking the crushed stone cushion layer.

[0020] Preferably, the transverse drainage pipe extends downward at an angle from the water collection well to the roadbed drainage ditch.

[0021] By adopting the above technical solution, the water in the collection well can flow more smoothly to the roadbed drainage ditch by gravity when it flows through the transverse drainage pipe, thus avoiding the accumulation of water in the collection well or transverse drainage pipe.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Water accumulated outside the median strip can be collected in the sump through the drainage ditch, and then discharged into the roadbed drainage ditch through the transverse drainage pipe, which helps to reduce the problem of poor drainage in the area outside the median strip of superelevation sections of highways.

[0023] 2. By installing cover plates, the top of the drainage ditch and the collection well are sealed to intercept debris carried by rainwater.

[0024] 3. By setting up drainage blind ditches, water accumulated in the asphalt layer of the highway can flow into the drainage open ditch, further reducing water accumulation on the outer side of the median strip. Attached Figure Description

[0025] Figure 1 This is a cross-sectional schematic diagram used in this application to illustrate a superelevation section of a highway.

[0026] Figure 2 This is a schematic diagram used in this application to illustrate the drainage structure.

[0027] Figure 3 This is a schematic diagram of the internal structure of the drainage structure used in this application.

[0028] Figure 4 This is a schematic diagram used in this application to illustrate the cover plate.

[0029] Figure 5 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0030] Figure 6 This is a schematic diagram of the structure used in this application for drainage ditches.

[0031] Explanation of reference numerals in the attached figures: 1. Superelevation section of highway; 2. Roadbed drainage ditch; 3. Median strip; 4. Water collection well; 41. Open drainage ditch; 411. Drainage channel; 42. Transverse drainage pipe; 5. Cover plate; 50. Drainage through hole; 51. Auxiliary drainage gap; 6. Drainage blind ditch; 61. PVC pipe; 62. Crushed stone layer. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6This application will be described in further detail.

[0033] Reference Figure 1 The superelevation section 1 of the highway is usually a one-way cross slope, with the overall cross section tilting towards the roadbed drainage ditch 2. The interior of the superelevation section 1 is an asphalt layer structure.

[0034] This application discloses a drainage structure for superelevation sections of highways, referring to... Figure 2 and Figure 3 The system includes a superelevation section 1 and a roadbed drainage ditch 2. The roadbed drainage ditch 2 is located on the side of the superelevation section 1 with a lower slope. The superelevation section 1 is equipped with a median strip 3. Several water collection wells 4 are buried in the area of ​​the superelevation section 1 near the outside of the median strip 3. Adjacent water collection wells 4 are connected to each other by drainage ditches 41. Both the water collection wells 4 and the drainage ditches 41 are set below the surface of the superelevation section 1. Several transverse drainage pipes 42 are also connected to the bottom of the water collection wells 4. The transverse drainage pipes 42 are buried inside the asphalt layer of the highway and are connected to the roadbed drainage ditch 2.

[0035] During rainy weather, rainwater outside the median strip 3 can flow into the collection well 4 and the drainage ditch 41, and then be discharged into the roadbed drainage ditch 2 through the transverse drainage pipe 42, reducing the occurrence of poor drainage and road surface water on the outside of the median strip 3.

[0036] Several water collection wells 4 are evenly distributed along the central divider 3. In this embodiment, the water collection wells 4 and the drainage ditch 41 are integrally cast; in actual construction, the water collection wells 4 and the drainage ditch 41 can also be prefabricated. The transverse drainage pipes 42 are usually concrete or plastic pipes. The transverse drainage pipes 42 are inclined downwards towards the roadbed drainage ditch 2, so that the rainwater discharged from the subsequent water collection wells 4 through the transverse drainage pipes 42 can better flow to the roadbed drainage ditch 2 by gravity, reducing the possibility of water accumulation in the water collection wells 4 and the transverse drainage pipes 42.

[0037] Reference Figure 3 and Figure 4 Specifically, both the collection well 4 and the drainage ditch 41 are covered with cover plates 5. The cover plates 5 are made of reinforced concrete. Several drainage holes 50 are opened on the top of the cover plates 5. During rainy weather, rainwater can flow into the collection well 4 and the drainage ditch 41 through the drainage holes 50. At the same time, the cover plates 5 can intercept larger debris carried by rainwater, preventing larger debris from entering the collection well 4 and the drainage ditch 41 and causing blockage. Auxiliary drainage notches 51 are opened at both ends of the cover plates 5. The auxiliary drainage notches 51 of adjacent cover plates 5 are spliced ​​together to form auxiliary drainage holes. The auxiliary drainage holes can increase the overall drainage area of ​​the cover plates 5, thereby improving the drainage efficiency of the cover plates 5.

[0038] Reference Figure 3 , Figure 5 and Figure 6 A drainage ditch 6 is also constructed within the asphalt layer of the superelevation section 1 of the highway. The drainage ditch 6 is located on the side of the open drainage ditch 41 away from the median strip 3. The drainage ditch 6 is higher than the open drainage ditch 41. Several drainage channels 411 are evenly distributed along the length of the open drainage ditch 41 at each end. The two ends of the drainage channels 411 are connected to the inner cavity of the open drainage ditch 41 and the inner cavity of the drainage ditch 6, respectively. The drainage ditch 6 allows water accumulated in the asphalt layer of the superelevation section 1 to flow into the open drainage ditch 41, which helps to further improve the drainage effect outside the median strip 3.

[0039] Reference Figure 5 and Figure 6 A PVC pipe 61 is laid inside the drainage ditch 6, with several permeable holes on its outer perimeter. The drainage ditch 6 is filled with a layer of crushed stone 62, which wraps around the PVC pipe 61. Rainwater entering the drainage ditch 6 from the subsequent asphalt layer of the road can first enter the PVC pipe 61 and then flow through it to the open drainage ditch 41. The perforated PVC pipe 61 creates a water storage and drainage space within the drainage ditch 6, facilitating a more concentrated and stable flow of rainwater into the open drainage ditch 41. The crushed stone layer 62 serves two purposes: firstly, it provides auxiliary support and reinforcement to the PVC pipe 61; secondly, it filters impurities carried by rainwater, reducing the likelihood of impurities clogging the permeable holes on the outer perimeter of the PVC pipe 61.

[0040] The drainage ditch 6 is also lined with a reverse filter geotextile, which wraps around the perimeter of the crushed stone layer 62. The reverse filter geotextile is used to help filter out impurities carried by rainwater. At the same time, when the asphalt layer is poured on the road surface, the reverse filter geotextile is used to restrict the asphalt from directly contacting the crushed stone layer 62.

[0041] The construction of the drainage structure in this application includes the following steps: S1: After the roadbed is formed, excavate the foundation pit for water collection well 4 and drainage ditch 41; S2: The water collection well 4 and the drainage ditch 41 are cast together and the horizontal drainage pipe 42 is assembled after the design strength meets the requirements. S3: After the water collection well 4, drainage ditch 41 and horizontal drainage pipe 42 have passed the acceptance, the asphalt layer structure is laid from bottom to top. When laying the middle and lower asphalt layers, the position of the drainage blind ditch 6 is reserved. S4: Cut the drainage groove 411 on the top of the side where the open drainage ditch 41 contacts the blind drainage ditch 6. The groove is 2mm wide and is cut every 5m. S5: Lay reverse filter geotextile and PVC pipe 61 at the reserved location of the drainage blind ditch 6; S6: Install cover plate 5 on the top of water collection well 4 and drainage ditch 41; S7: After backfilling crushed stone at the drainage blind ditch 6 (0.5-2cm of crushed stone filling), wrap the top of the crushed stone layer 62 with the reserved geotextile. S8: Lay the asphalt surface layer according to construction requirements.

[0042] The implementation principle of this embodiment is as follows: During rainy weather, rainwater outside the median strip 3 flows into the collection well 4 through the drainage pipe and is discharged into the roadbed drainage ditch 2 through the transverse drainage pipe 42, effectively solving the problems of poor drainage and road surface water accumulation outside the superelevation section 1 of the highway.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drainage structure for a superelevated highway section, comprising a superelevated highway section (1) and a roadbed drainage ditch (2), wherein the roadbed drainage ditch (2) is located on the side of the superelevated highway section (1) with a lower slope, and the superelevated highway section (1) is provided with a median strip (3); characterized in that: The superelevation section (1) of the highway is equipped with several water collection wells (4). The water collection wells (4) are located outside the median strip (3). Adjacent water collection wells (4) are connected by drainage ditches (41). The water collection wells (4) and the drainage ditches (41) are both set lower than the road surface of the superelevation section (1). Each water collection well (4) is connected to a transverse drainage pipe (42). The transverse drainage pipe (42) is buried in the superelevation section (1) of the highway and is connected to the roadbed drainage ditch (2). The superelevation section (1) of the highway is also provided with a drainage blind ditch (6) in the asphalt layer. The drainage blind ditch (6) is located on the side of the drainage open ditch (41) away from the intermediate divider (3). The drainage blind ditch (6) is connected to the drainage open ditch (41). The drainage blind ditch (6) is provided with a perforated PVC pipe (61), and the perforated PVC pipe (61) is wrapped with a layer of gravel (62) on its outer periphery; The top end of the drainage ditch (41) is provided with a drainage groove (411), and the two ends of the drainage groove (411) are respectively connected to the inner cavity of the drainage ditch (41) and the inner cavity of the drainage blind ditch (6); The drainage blind ditch (6) is lined with a reverse filter geotextile, which wraps around the crushed stone layer (62).

2. A highway super-high section drainage structure according to claim 1, characterized in that: Both the water collection well (4) and the drainage ditch (41) are covered with cover plates (5), and the top of the cover plate (5) has several drainage holes (50).

3. A highway super-elevation section drainage structure according to claim 2, characterized in that: Both ends of the cover plate (5) are provided with auxiliary drainage gaps (51), and the auxiliary drainage gaps (51) at the adjacent ends of the cover plates (5) are spliced ​​together to form an auxiliary drainage hole.

4. The highway super-high section drainage structure according to claim 1, characterized in that: The transverse drainage pipe (42) extends downward at an angle from the water collection well (4) to the roadbed drainage ditch (2).

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