Street expansion drainage system

Abstract

The invention relates to the technical field of street drainage, in particular to a street expansion drainage system, drainage ditches are distributed on the two sides of a street, the street expansion drainage system further comprises a plurality of inclined water storage pipes connected with the drainage ditches, the water storage pipes extend outwards, then the water storage pipes are distributed on a sidewalk, the inner diameter of each water storage pipe is 40-60 cm, the wall thickness of each water storage pipe is 25-30 mm, and the length value of each water storage pipe is 50-60 cm smaller than the width value of the sidewalk. A high-position drainage ditch is further arranged, the high-position drainage ditch is located on the edge of a street or close to a building or a side slope, the water storage space is increased, meanwhile, the drainage ditch and the high-position drainage ditch form two ditches, and water can be drained more quickly. When the amount of water in the drainage ditch is large, the water crosses the permeable baffle to enter the water storage pipe and is temporarily stored in the water storage pipe or enters the high-level drainage ditch, when the amount of water in the drainage ditch is reduced, water in the water storage pipe flows back into the drainage ditch through the permeable baffle, and then the purpose of buffering water flow is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of street drainage, and particularly to a street expansion drainage system. Background Art

[0002] Stormwater management mainly includes large-scale planning and construction such as rain gardens, as well as widely distributed green roofs and bioretention ponds, which can store water during rainfall to relieve the pressure on the urban drainage system. In particular, bioretention areas can intercept solid waste and thus prevent it from entering the drainage pipes, and can clean solid waste during the process of dealing with rainstorms. The drainage system mainly includes drainage ditches around roads and buildings, and the drainage ditches are connected to underground drain pipes to quickly drain water.

[0003] In urban construction, streets have low load-bearing capacity and wide distribution. Therefore, streets are the main components of the urban drainage system. To improve the water storage and drainage effects of streets, technicians in this field have continuously improved streets, mainly including forming water storage cavities underground in streets, installing water storage towers in streets, planning water storage planting ponds in streets, and laying water storage layers on streets, etc. Due to the wide distribution and long mileage of streets, forming water storage cavities underground in streets can provide a large water storage space, but the construction cost is high. Installing water storage towers in streets can pump water into the water storage towers during the wet season for watering green plants, etc. The water storage capacity is small, and the effect is small during heavy rain and rainstorm weather, and it occupies a large space and has a high cost. Laying a water storage layer on the street is usually a permeable brick layer, which allows water to infiltrate, thereby slowing down surface water accumulation. However, the permeable bricks have a small water storage capacity. Technicians in this field pursue technical solutions with less construction work and large water storage capacity. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a street expansion drainage system that is implemented during the maintenance of streets and avoids large-scale construction.

[0005] The present invention is achieved through the following technical solutions: A street expansion drainage system includes drainage ditches arranged on both sides of the street, and also includes a plurality of inclined water storage pipes connected to the drainage ditches. The water storage pipes extend outwards, and the ends of the water storage pipes are connected to a high-level drainage ditch. The high-level drainage ditch extends in the same direction as the drainage ditch, and the upper end of the high-level drainage ditch is higher than the street surface. A permeable baffle is arranged at the lower end of the water storage pipe.

[0006] Further, the distance between adjacent two water storage pipes is 1.5 - 2.5 m. A hardened support layer is arranged on the lower side of the water storage pipe, an extended support layer is arranged on the upper side of the water storage pipe, a backfill support layer is arranged between adjacent two water storage pipes, a sand layer is arranged at the upper ends of the backfill support layer and the extended support layer, and a permeable brick layer is arranged at the upper end of the sand layer.

[0007] Further, a connecting pipe is also provided between the high-level drainage ditch and the drainage ditch. The ratio of the numerical value of the number of the connecting pipes to the numerical value of the number of the water storage pipes is 1:10 - 15. The connecting pipes and the water storage pipes are distributed at intervals. The connecting pipes communicate with the bottom of the high-level drainage ditch, and the water storage pipes communicate with the middle position of the high-level drainage ditch.

[0008] Further, the drainage ditch includes a precast bottom ditch. The cross-section of the precast bottom ditch is an arc opening upward. Anti-settlement piles are arranged at the lower end of the precast bottom ditch, side walls extending upward are arranged at the upper end of the precast bottom ditch, and support grooves matching with the connecting pipes and the water storage pipes are arranged on the precast bottom ditch.

[0009] Further, the permeable baffle includes a precast bottom support. The outer wall of the precast bottom support cooperates with the water storage pipe. A permeable filling layer is arranged inside the precast bottom support. The permeable baffle accounts for 3 / 4 of the cross-sectional area of the water storage pipe.

[0010] Further, a return port is arranged at the lower end of the permeable baffle.

[0011] Further, a precast slab layer is also arranged between the permeable brick layer and the high-level drainage ditch.

[0012] The inclination angle of the water storage pipe is 6°. The distance between the permeable baffle and the lower end of the water storage pipe is 15 - 20 cm. A swirling area is formed between the permeable baffle and the lower end of the water storage pipe.

[0013] Further, a settlement tank is connected to the high-level drainage ditch. The settlement tank is connected to the side of the high-level drainage ditch. The bottom of the settlement tank is an inclined plane. The water flow in the high-level drainage ditch continues to be conveyed to the water storage lake after swirling in the settlement tank.

[0014] The beneficial effects of the present invention are as follows: 1. Drainage ditches are distributed on both sides of the street, and also include a plurality of inclined water storage pipes connected to the drainage ditches. The water storage pipes extend outward, so that the water storage pipes are distributed on the sidewalk. The width of the sidewalk is 2 - 4 m, and generally no hardening is done. A gravel layer, a sand cushion layer and a permeable brick layer are laid, which is easier to construct. The inner diameter of the water storage pipe is 40 - 60 cm, the wall thickness is 25 - 30 mm, and the length value is 50 - 60 cm less than the width of the sidewalk. Thus, the purpose of rapid construction can be achieved, and a water storage space can be quickly formed. A high-level drainage ditch is also provided. The high-level drainage ditch is located at the edge of the street, close to the building or the slope, increasing the water storage space. At the same time, the drainage ditch and the high-level drainage ditch form two ditches, which can drain water faster. A permeable baffle is arranged at the lower end of the water storage pipe. When the water volume in the drainage ditch is large, it crosses the permeable baffle and enters the water storage pipe, and is temporarily stored in the water storage pipe or enters the high-level drainage ditch. When the water volume in the drainage ditch decreases, the water in the water storage pipe flows back to the drainage ditch through the permeable baffle, thus achieving the purpose of buffering the water flow; 2. The distance between adjacent water storage pipes is 1.5 - 2.5 m, with a relatively high density. During construction, more soil and gravel will be excavated and used to raise the sidewalk and control the inclination of the sidewalk so that water cannot overflow the sidewalk. A hardened support layer is provided on the lower side of the water storage pipe, which can prevent the settlement or fracture of the water storage pipe. An extended support layer is provided on the upper side of the water storage pipe to disperse the stress on the upper side of the water storage pipe, protect the water storage pipe, and strengthen the support for the permeable brick layer at the same time. 3. It is implemented during the maintenance of the street and does not require excavation of the main road surface. Therefore, it can be gradually implemented according to the plan. After implementation, it is integrally connected by a high-level drainage ditch to improve the water storage and drainage capacity of the urban street and cooperate with the planning and design of the sponge city. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of Embodiment 1; Figure 2 It is a schematic layout diagram of the water storage pipes; Figure 3 It is a schematic cross-sectional diagram of the water storage pipe; Figure 4 It is a schematic structural diagram of the permeable baffle; Figure 5 It is a schematic cross-sectional diagram of the water storage pipe; Figure 6 It is a schematic cross-sectional diagram of the connecting pipe; Figure 7 It is a schematic structural diagram of the precast bottom ditch; Figure 8 It is a schematic connection diagram of the precast bottom ditch and the anti-settlement pile; Figure 9 It is a schematic connection diagram of the settlement tank and the high-level drainage ditch; Figure 10 It is a schematic cross-sectional diagram of the settlement tank.

[0016] Wherein: 1. Street pavement; 2. Drainage ditch; 201. Precast bottom ditch; 202. Anti-settlement pile; 203. Side wall; 204. Grid plate; 205. Support groove; 3. Sidewalk; 301. Step; 302. Backfill support layer; 303. Sand layer; 304. Permeable brick layer; 305. Prefabricated plate layer; 306. Hardened support layer; 307. Rammed plain soil layer; 308. Plain soil layer; 309. Extended support layer; 4. High-level drainage ditch; 401. Buffer cavity; 402. Cover plate; 403. Settlement tank; 5. Connecting pipe; 6. Water storage pipe; 601. Pipe body; 6021. Prefabricated bottom support; 6022. Permeable filling layer; 6023. Return port. DETAILED DESCRIPTION OF THE INVENTION

[0017] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1 As Figures 1-10As shown in the figure, a street expansion drainage system includes drainage ditches 2 distributed on both sides of the street, and also includes a plurality of inclined water storage pipes 6 connected to the drainage ditches 2. The water storage pipes 6 extend outwards, so that the water storage pipes 6 are distributed on the sidewalk 3. The width of the sidewalk 3 is 2 - 4m, and generally it is not hardened. A gravel layer, a sand cushion layer and a permeable brick layer 304 are laid, which is easier to construct. The water storage pipe 6 includes a pipe body 601. The inner diameter of the pipe body 601 is 40 - 60cm, and the wall thickness is 25 - 30mm. An embedded tensile steel bar mesh is provided to improve the crack resistance. During the test, a pipe body 601 with a larger inner diameter was tried, such as an inner diameter of 80cm. It was necessary to increase the wall thickness to 40mm to ensure the structural strength, and the excavation trench depth was deeper to provide stable support for the water storage pipe 6, and the construction cost was higher. It is applicable to streets with lower terrain. The length value of the pipe body 601 is less than 50 - 60cm of the width of the sidewalk 3, so as to achieve the purpose of rapid construction and quickly form a water storage space. The distance between two adjacent water storage pipes 6 is 1.5 - 2.5m, with a relatively high density. During the construction process, the excavated soil and gravel are used to raise the sidewalk 3 and control the inclination angle of the sidewalk 3 so that water cannot overflow the sidewalk 3. The inclination angle of the sidewalk 3 is 2 - 3°. A green plant planting groove is constructed between two adjacent water storage pipes 6, and then green plants are planted. Through the water storage pipe 6 and the corresponding support layer, the roots of the green plants can be isolated. A hardened support layer 306 is laid on the lower side of the water storage pipe 6. The hardened support layer 306 is a mortar layer with a thickness of 20mm and a width of 25 - 30cm. It is tamped on the plain soil layer 308 to obtain a tamped plain soil layer 307. The hardened support layer 306 is laid on the tamped plain soil layer 307 to provide stable support for the water storage pipe 6. The lower end of the water storage pipe 6 is embedded in the hardened support layer 306, so as to position the water storage pipe 6 and avoid slipping. An extended support layer 309 is laid on the upper side of the water storage pipe 6. The extended support layer 309 is made of reinforced precast slabs with a thickness of 20mm and a width of 100cm, which disperses the stress on the upper side of the water storage pipe 6, protects the water storage pipe 6, and at the same time strengthens the support for the permeable brick layer 304. During the test, it was found that due to the shallow burial depth of the water storage pipe 6, the backfill support layer 302 was unevenly distributed, and the water infiltrating from the permeable brick layer 304 would affect the stability of the backfill support layer 302 near the water storage pipe 6, resulting in a poor flatness of the permeable brick layer 304 and even holes and collapses. Through the extended support layer, the infiltrating water of the permeable brick layer 304 is extended outwards to protect the backfill support layer 302 near the water storage pipe 6. A backfill support layer 302 is constructed between two adjacent water storage pipes 6. The backfill support layer 302 is a soil and stone layer excavated from the original sidewalk 3. Then a sand layer 303 is laid on the upper ends of the backfill support layer 302 and the extended support layer 309, and a permeable brick layer 304 is laid on the upper end of the sand layer 303. Due to the inclination of the sidewalk 3, the water flows quickly into the drainage ditch 2, and a small amount of accumulated water infiltrates through the permeable bricks.

[0020] The inclination angle of the water storage pipe 6 is 5°. A water permeable baffle is installed at the lower end of the water storage pipe 6. Specifically, the water permeable baffle includes a precast bottom support 6021. The precast bottom support 6021 is a reinforced precast plate in the shape of a major arc. The outer wall of the precast bottom support 6021 is matched with the water storage pipe 6. There is a water permeable filling layer 6022 in the precast bottom support 6021. The water permeable filling layer 6022 can be made of precast water permeable plates or water permeable bricks. The thickness value of the water permeable filling layer 6022 is 1 / 2 of the width value of the precast bottom support 6021. After prefabricating the water permeable baffle, it is pushed into the water storage pipe 6, and then mortar is applied for fixation, which is convenient for positioning and construction. In particular, the angle of the water permeable filling layer 6022 can be controlled through the precast bottom support 6021, avoiding the angle deviation and connection gap caused by directly installing the water permeable filling layer 6022. The precast bottom support 6021 can also increase the connection stability between the water permeable baffle and the water storage pipe 6, preventing the water permeable baffle from detaching due to water impact. The water permeable baffle occupies 3 / 4 of the cross-sectional area of the water storage pipe 6. When the water volume in the drainage ditch 2 is large, it passes over the water permeable baffle and enters the water storage pipe 6, where it is temporarily stored or enters the high-level drainage ditch 4. When the water volume in the drainage ditch 2 decreases, the water in the water storage pipe 6 flows back to the drainage ditch 2 through the water permeable baffle, thereby achieving the purpose of buffering the water flow. A return port 6023 is reserved at the lower end of the water permeable baffle. During the test, it was found that after the water flow in the water storage pipe 6 was buffered multiple times, silt would accumulate at the water permeable baffle, causing the water permeable baffle to lose the ability to return water. Through the return port 6023, silt residue can be avoided. The area value of the return port 6023 is 1 / 6 - 1 / 8 of the area value of the water permeable baffle.

[0021] The end of the water storage pipe 6 is connected to the high-level drainage ditch 4. The high-level drainage ditch 4 extends in the same direction as the drainage ditch 2. The upper end of the high-level drainage ditch 4 is higher than the street surface 1. The high-level drainage ditch 4 is located at the street edge, close to the building or the slope, increasing the water storage space. At the same time, the drainage ditch 2 and the high-level drainage ditch 4 form two ditches, which can drain water faster. A connecting pipe 5 is also installed between the high-level drainage ditch 4 and the drainage ditch 2. The ratio of the numerical value of the connecting pipe 5 to the numerical value of the water storage pipe 6 is 1:10 - 15. The connecting pipes 5 and the water storage pipes 6 are distributed at intervals. The connecting pipe 5 is connected to the bottom of the high-level drainage ditch 4, and the water storage pipe 6 is connected to the middle position of the high-level drainage ditch 4. Thus, a buffer cavity 401 is formed at the lower end of the high-level drainage ditch 4. Through the connecting pipe 5, the water stored in the buffer cavity 401 can flow back into the drainage ditch 2, thereby preventing the water stored in the drainage ditch 2 from deteriorating. When the high-level drainage ditch 4 is close to the building, waterproof treatment is carried out on the high-level drainage ditch 4 to prevent the building foundation from being eroded by water flow. When the high-level drainage ditch 4 is close to the ramp, the high-level drainage ditch 4 is built with permeable bricks, which can seep water outward. The high-level drainage ditch 4 is connected to the water storage lake, and a gate is installed at the end of the high-level drainage ditch 4. The drainage ditch 2 is connected to the municipal underground drainage system. A cover plate 402 is installed on the high-level drainage ditch 4. The high-level drainage ditch 4 is relatively high, and the water flow on the street will not flow outward over the high-level drainage ditch 4. In rainy weather, the rainwater first flows along the street into the drainage ditch 2 and is drained through the municipal drainage system, and there is no water accumulation on the road surface. When the water flow continues to increase, part of it enters the water storage pipe 6 for temporary storage, and there is no water accumulation on the road surface. When the water flow further increases, part of it enters the high-level drainage ditch 4 through the water storage pipe 6 and then flows into the water storage lake. At this time, there is water accumulation on the road surface. Through the water storage pipe 6 and the high-level drainage ditch 4, the road surface water accumulation can be alleviated, and the construction is only carried out on the sidewalk 3 with a relatively weak hardening degree, with low construction difficulty and low cost. During the testing process, it was also found that the water storage pipe 6 and the permeable baffle itself also formed a filtering structure. The water flow flowing into the high-level drainage ditch 4 through the water storage pipe 6 does not contain pollutants with a relatively large volume such as gravel, but only contains small-particle suspended substances. When the flow rate is relatively large, it enters the high-level drainage ditch 4, resulting in no sediment layer in the high-level drainage ditch 4 after long-term use. In addition, a swirl is formed at the inlet of the water storage pipe 6. There are many water storage pipes 6, forming many swirl areas. Part of the solid waste with a large particle size is buffered and retained in the swirl areas and is carried into the drainage ditch 2 during the backflow process of the water flow in the water storage pipe 6. To improve the effect of the swirl area, the distance between the permeable baffle and the lower end of the water storage pipe 6 is 15 - 20 cm.

[0022] The high-level drainage ditch 4 extends to an open area and is connected to a sedimentation tank 403. The sedimentation tank 403 is connected to the side of the high-level drainage ditch. The bottom of the sedimentation tank 403 is inclined. The water flow in the high-level drainage ditch 4 passes through the sedimentation tank 403 in a swirling manner and then continues to be conveyed to the water storage lake. Some suspended small particles are precipitated in the sedimentation tank 403 to purify the water entering the water storage lake. Green plants can be planted in the sedimentation tank 403 to improve the purification effect. Multiple sedimentation tanks 403 are distributed. The surplus water in the high-level drainage ditch 4 can also be discharged through the sedimentation tank 403. In addition, a ditch is led out from the sedimentation tank 403 and connected to the water storage lake.

[0023] The drainage ditch 2 includes a precast bottom ditch 201. The cross-section of the precast bottom ditch 201 is an arc with an upward opening and is obtained by splicing multiple precast arc plates. Waterproof treatment is carried out at the joints. Anti-settlement piles 202 are installed at the lower end of the precast bottom ditch 201. The anti-settlement piles 202 are at least distributed at the joints of the precast arc plates, thereby improving the stability of the precast bottom ditch 201. A support groove 205 that cooperates with the communication pipe 5 and the water storage pipe 6 is integrally formed on the precast bottom ditch 201, thereby supporting the lower ends of the water storage pipe 6 and the communication pipe 5. Since the water storage pipe 6 is inclined, there will be a tendency to slide during long-term use. The support groove 205 blocks the sliding of the water storage pipe 6, and the support stability is improved through the anti-settlement piles 202. In some embodiments, the anti-settlement piles 202 can be vertical precast water retaining plates, thereby preventing water from seeping into the roadbed. A side wall 203 that extends upward is constructed at the upper end of the precast bottom ditch 201. The side wall 203 is a concrete mortar layer or a bricklaying layer, and waterproof treatment is carried out by means of waterproof mortar, etc., to reduce the seepage of water. A grating 204 is laid at the upper end of the drainage ditch 2. The side wall 203 close to the sidewalk 3 extends upward to form a step 301.

[0024] A precast slab layer 305 is also installed between the permeable brick layer 304 and the high-level drainage ditch 4. The buried depth of the water storage pipe 6 close to the high-level drainage ditch 4 is shallower. The precast slab layer 305 can disperse and expand the stress on the upper side of the support layer 309 and can prevent water from seeping near the high-level drainage ditch 4.

[0025] During the design process, An attempt was made to construct a water storage cavity in the roadbed, which was achieved by excavation or pipe jacking. After calculation, the construction volume was huge and it posed a road safety hazard. It was only suitable for a small amount of local water storage and did not meet the current design requirements; An attempt was made to widely distribute exposed water storage ponds or water storage towers on the street, which occupied ground space and the water demand could not meet the expected requirements.

[0026] Therefore, in the process of designing a sponge city, large water storage units such as water storage lakes and rainwater parks are designed for off-peak drainage and water storage; small and widespread water storage units such as bioretention areas, green roofs, and green belts are used for buffering; and widespread drainage ditches and municipal underground drainage systems are used for rapid drainage. The street expansion drainage system provided in this embodiment realizes short-term buffering and water storage while using widespread drainage ditches for rapid drainage, with a small construction volume.

[0027] The street expansion drainage system provided in this application is implemented during the renovation and maintenance of the sidewalk. Taking a single water storage pipe 6 with a length of 1.5 m as an example, the inner diameter is 50 cm, the volume of a single pipe is close to 0.3 m³, the distance between adjacent two water storage pipes 6 is 2 m, the number of single-sided water storage pipes 6 per kilometer of the street is 500, and the number of double-sided water storage pipes 6 is 1000, obtaining a water storage volume of 300 m³. It can temporarily store water during the precipitation peak, and the sidewalk is made of water storage pipes, so the anti-settlement ability is improved, and thus the maintenance period is increased.

[0028] Since there is usually no water in the water storage pipe 6 under normal circumstances, but the water storage pipe 6 is a straight pipe with both ends connected, it will not form nests for small animals such as rats, reducing the risk of blockage. Combining its high structural strength and the ability to be automatically flushed, it does not require maintenance and has a long service life.

[0029] The street expansion drainage system provided in this embodiment utilizes the basic advantage that the two sides of the urban street are high and the middle is low. During the implementation process, the excavated soil layer is used in place to pad the two sides of the sidewalk, making the inclination angle of the sidewalk 3 2 - 3°, so that the sidewalk can drain water quickly, and it can also prevent water from overflowing outside the street. At the same time, it can also wash the permeable brick layer 6022 during rainfall, thereby reducing the blockage of the permeable brick layer 6022.

[0030] In summary, the street expansion drainage system provided in this embodiment is implemented during the maintenance of the street, without the need to excavate the main road surface. Therefore, it can be gradually implemented according to the plan. After implementation, it is integrally connected in series through high-position drainage ditches, improving the water storage and drainage capacity of urban streets and cooperating with the planning and design of sponge cities.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A street expansion drainage system, comprising drainage ditches arranged on both sides of the street, characterized in that: It also includes a plurality of inclined water storage pipes connected to the drainage ditch, the water storage pipes extend outward, the ends of the water storage pipes are connected to the high-level drainage ditch, the high-level drainage ditch extends in the same direction as the drainage ditch, the upper end of the high-level drainage ditch is higher than the street surface, and a permeable baffle is arranged at the lower end of the water storage pipe.

2. The street expansion drainage system according to claim 1, characterized in that: The spacing between two adjacent water storage pipes is 1.5-2.5m. A hardened support layer is arranged on the lower side of the water storage pipe, an expanded support layer is arranged on the upper side of the water storage pipe, a backfill support layer is arranged between two adjacent water storage pipes, a sand layer is arranged on the upper end of the backfill support layer and the expanded support layer, and a permeable brick layer is arranged on the upper end of the sand layer.

3. The street expansion drainage system according to claim 2, characterized in that: A connecting pipe is also arranged between the high-level drainage ditch and the drainage ditch. The ratio of the number of the connecting pipes to the number of the water storage pipes is 1:10-15. The connecting pipes and the water storage pipes are distributed at intervals. The connecting pipe is connected to the bottom of the high-level drainage ditch, and the water storage pipe is connected to the middle position of the high-level drainage ditch.

4. The street expansion drainage system according to claim 3, characterized in that: The drainage ditch includes a prefabricated bottom ditch, the cross-section of the prefabricated bottom ditch is an arc-shaped opening upward, the lower end of the prefabricated bottom ditch is provided with anti-sinking piles, the upper end of the prefabricated bottom ditch is provided with side walls extending upward, and the prefabricated bottom ditch is provided with a supporting groove that cooperates with a connecting pipe and a water storage pipe.

5. The street expansion drainage system according to claim 4, characterized in that: The permeable baffle comprises a prefabricated base, the outer wall of the prefabricated base cooperates with the water storage pipe, a permeable filling layer is arranged inside the prefabricated base, and the permeable baffle occupies 3 / 4 of the cross-sectional area of ​​the water storage pipe.

6. The street expansion drainage system according to claim 5, characterized in that: A reflux port is provided at the lower end of the water-permeable baffle, and the area value of the reflux port is 1 / 6-1 / 8 of the area value of the water-permeable baffle.

7. The street expansion drainage system according to claim 6, characterized in that: A prefabricated board layer is also arranged between the permeable brick layer and the high-position drainage ditch.

8. The street expansion drainage system according to claim 7, characterized in that: The water storage pipe has an inclination angle of 6°, the water permeable baffle is 15-20 cm away from the lower end of the water storage pipe, and the water permeable baffle and the lower end of the water storage pipe form a vortex area.

9. The street expansion drainage system according to claim 8, characterized in that: The high-level drainage ditch is connected to a sedimentation tank, which is connected to the side of the high-level drainage ditch. The bottom of the sedimentation tank is an inclined surface. The water flow in the high-level drainage ditch is continuously transported to the water storage lake after swirling through the sedimentation tank.

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