A sponge city rainwater diversion system

Abstract

This application relates to the field of municipal drainage technology, and particularly to a rainwater diversion system for sponge cities, which includes a rainwater diversion box arranged between adjacent expansion joints of an old road and a permeable pavement arranged on the top of the rainwater diversion box. Both the permeable pavement and the rainwater diversion box adopt a permeable structure and are located in the depressed part of the old road. The middle or top of the rainwater diversion box is connected to the municipal drainage pipeline. The permeable pavement is smoothly transitioned with the old road, and a permeation and drainage component for dispersing and permeating the rainwater that is not discharged in time into the ground is arranged in the rainwater diversion box. This application can optimize the permeation and drainage performance of the old road while reducing the impact on the old road.

Description

Technical Field

[0001] The present application relates to the field of municipal drainage technology, and in particular to a sponge city rainwater diversion system. Background Art

[0002] With the development of cities, the problem of waterlogging caused by rainwater is becoming more and more serious. The core reason for waterlogging is that the infiltration and drainage capacity of hardened roads is extremely low, which causes most of the rainwater on the ground to be converted into ground runoff when it rains, and cannot be discharged through the drainage system in time, causing rainwater to accumulate on the urban road surface, resulting in waterlogging.

[0003] Therefore, in order to solve the problems of urban waterlogging and infiltration and drainage, the concept of rainwater management of "sponge city" came into being. It is expected that the city can absorb, store, infiltrate and purify water like a sponge when it rains, and "release" and utilize the stored water when needed. Therefore, in the current urban development, when municipal construction is carried out, the number of parks and scenic spots and the construction of roads will all take into account the infiltration and drainage performance. For example, the road adopts permeable roads, so that rainwater can be infiltrated and drained into the ground in time, and the remaining rainwater that does not have time to infiltrate is discharged through the municipal drainage system, thereby achieving the effect of diverting urban rainwater. It can also replenish groundwater and reduce the pressure on the urban drainage system.

[0004] However, in the actual development process, some cities have a large number of hardened pavements with extremely poor water permeability before the application of sponge cities. Urban waterlogging is mainly caused by the inability of rainwater from hardened pavements to be drained in time, which not only leads to waterlogging, but also causes local areas to have groundwater that cannot be replenished in time, resulting in drought and water shortage. Therefore, how to solve the problem of water seepage and drainage in pavement areas with relatively poor water permeability is an urgent problem to be solved in the development of sponge cities. Summary of the invention

[0005] In order to optimize the infiltration and drainage performance of old roads, the present application provides a sponge city rainwater diversion system.

[0006] This application provides a sponge city rainwater diversion system, which adopts the following technical solutions:

[0007] A sponge city rainwater diversion system comprises a rainwater diversion box arranged between adjacent expansion joints of an old road and a permeable pavement arranged on the top of the rainwater diversion box. Both the permeable pavement and the rainwater diversion box adopt a permeable structure and are located in a concave part of the old road. The middle or top of the rainwater diversion box is connected to a municipal drainage pipe. The permeable pavement and the old road have a smooth transition. In addition, a drainage component for dispersing rainwater that is not discharged in time into the underground is arranged in the rainwater diversion box.

[0008] By adopting the above technical solution, when optimizing the seepage and drainage performance of old roads, it is only necessary to remove the old road between two adjacent expansion joints in the sunken part of the old road, and then sequentially construct the rainwater diversion box, the seepage and drainage component, and the permeable pavement; and during rainfall, the rainwater in the sunken part can be promptly drained into the rainwater diversion box through the permeable pavement, and the rainwater is dispersed and drained into the ground through the seepage and drainage component, which is used to supplement groundwater while reducing the drainage pressure on the municipal drainage pipeline.

[0009] Optionally, the permeable pavement includes a support layer and a filling layer made of permeable asphalt concrete. The support layer is laid on the top of the rainwater diversion box and is formed with a plurality of permeable openings. The support layer is embedded in the bottom of the filling layer. The inner wall of the permeable opening is in a frustum shape with the large end facing away from the opening of the rainwater diversion box.

[0010] By adopting the above technical solution, during rainfall, rainwater can pass through the filling layer and the permeable openings to drain the rainwater into the rainwater diversion box. At the same time, when the filling layer bears the load, the deformation of the filling layer is restricted through the permeable openings, optimizing the load-bearing capacity of the filling layer and reducing the normal use of the old road.

[0011] Optionally, the support layer is made of reinforced concrete and steel bars pass through the permeable openings. A waterproof pipe is sleeved on the part of the steel bars in the permeable openings in the support layer, and both ends of the waterproof pipe are preset in the support layer respectively.

[0012] By adopting the above technical solution, the waterproof pipe can reduce the erosion of the rainwater seeping in the permeable opening to the steel bars, and at the same time is used to further support the filling layer.

[0013] Optionally, a support column penetrates through the rainwater diversion box. The bottom of the support column is used to connect to the rock and soil under the old road. The top of the support column is connected to the support layer, and the support column is formed with a support platform. The rainwater diversion box is laid on the support platform.

[0014] By adopting the above technical solution, during installation, since there is only a rainwater diversion box under the road, at this time, after connecting to the stable rock layer through the support column, the rainwater diversion box is further supported through the support platform, so as to support the rainwater diversion box and at the same time support the permeable pavement synchronously, reducing the impact on the load of the old road.

[0015] Optionally, a plurality of connection holes penetrating to the support platform are formed at the part of the rainwater diversion box corresponding to the support column. The support platform is made of reinforced concrete and part of the steel bars penetrate through the connection holes. The support column is formed with a fixed ring platform. The bottom wall of the rainwater diversion box is clamped between the support platform and the fixed ring platform, and the fixed ring platform fills the connection holes.

[0016] By adopting the above technical solution, the fixed ring platform cooperates with the steel bars preset inside the support platform, effectively fixing and connecting the rainwater diversion box to the support column. At the same time, it can also reduce the possibility of the rainwater in the rainwater diversion box eroding the support platform and the steel bars inside the support column through the support ring platform.

[0017] Optionally, the infiltration and drainage component includes an infiltration and drainage outer pipe and an infiltration and drainage inner rod arranged inside the infiltration and drainage outer pipe. The strength of the infiltration and drainage outer pipe is greater than that of the infiltration and drainage inner rod, and the infiltration and drainage outer pipe is provided with a plurality of drainage holes. The infiltration and drainage inner rod is a multi-porous structure rod formed by hot melting the contact points of fiber filaments with each other. One end of the infiltration and drainage outer pipe communicates with the bottom of the rainwater diversion box, and the other end of the infiltration and drainage outer pipe extends into the soil on the periphery of the rainwater diversion box; the multi-porous structure rod formed by hot melting the contact points of fiber filaments with each other can also have a certain strength and the performance of elastic bending, providing a certain support for the infiltration and drainage outer pipe while filtering the rainwater inside the rainwater diversion box.

[0018] By adopting the above technical solution, during installation, first insert the infiltration and drainage outer pipe through the rainwater diversion box and then insert it into the soil on the periphery of the rainwater diversion box, and then fill the inside of the infiltration and drainage outer pipe with the infiltration and drainage inner rod while covering the drainage holes to reduce the possibility of the soil on the periphery of the rainwater diversion box entering the inside of the infiltration and drainage outer pipe and the rainwater diversion box.

[0019] Optionally, the infiltration and drainage outer pipe includes a plurality of sequentially spliced infiltration and drainage pipe sections. The infiltration and drainage pipe sections are sequentially inserted through the rainwater diversion box and pushed into the soil on the periphery of the rainwater diversion box, and the drainage holes are opened in the infiltration and drainage pipe section located at a position far from the rainwater diversion box among the plurality of infiltration and drainage pipe sections.

[0020] By adopting the above technical solution, when installing the infiltration and drainage outer pipe, only need to sequentially insert the infiltration and drainage pipe sections into the soil on the periphery of the rainwater diversion box, then discharge the soil inside the infiltration and drainage pipe sections, and then fill the inside of the plurality of infiltration and drainage pipe sections with the infiltration and drainage inner rod.

[0021] Optionally, the end of the infiltration and drainage outer pipe facing the rainwater diversion box is bent and formed with an infiltration and drainage flange. An elastic cushion plate is provided between the infiltration and drainage flange and the inner wall of the rainwater diversion box, and the infiltration and drainage flange is fixedly connected to the inner wall of the rainwater diversion box through anchor bolts.

[0022] By adopting the above technical solution, the infiltration and drainage pipe sections can be relatively tightly combined with the rainwater diversion box, reducing the possibility of external rock and soil directly entering the inside of the rainwater diversion box.

[0023] Optionally, the outer wall of the rainwater diversion box is coated with permeable geotextile, and the outer infiltration and drainage pipe is provided with an anti-infiltration component. The anti-infiltration component includes an anti-infiltration ring and an anti-infiltration plate for covering the anti-infiltration ring. The anti-infiltration ring is coaxially and fixedly connected to the inlet edge of the outer infiltration and drainage pipe. The anti-infiltration plate is hinged to the anti-infiltration ring and overlaps at one end of the anti-infiltration ring away from the center of the rainwater diversion box. The outer infiltration and drainage pipe is provided with a restricting member that elastically abuts the anti-infiltration plate against the anti-infiltration ring by water absorption and expansion, and the water absorption end of the restricting member is arranged on the side of the anti-infiltration plate away from the anti-infiltration ring.

[0024] By adopting the above technical solution, when the water content outside the rainwater diversion box is relatively large, the anti-infiltration plate can be abutted against the anti-infiltration ring by the water absorption and expansion of the restricting member, so as to further reduce the possibility of external fine rock and soil following the water into the rainwater diversion box; at the same time, when the rainwater inside the rainwater diversion box is relatively large, the anti-infiltration plate will be opened earlier relative to the anti-infiltration ring at this time, so that the rainwater in the rainwater diversion box can be normally infiltrated and drained.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] When optimizing the infiltration and drainage performance of old roads, it is only necessary to remove the old road between two adjacent expansion joints in the sunken part of the old road, and then successively construct the support columns, rainwater diversion boxes, infiltration and drainage components, and permeable pavements, so as to effectively reduce the impact on the old road; and during rainfall, the rainwater in the sunken part can be timely infiltrated and drained into the rainwater diversion box through the permeable pavement, and the rainwater is dispersed and infiltrated and drained into the ground through the outer infiltration and drainage pipe and the inner infiltration and drainage rod, which is used to supplement groundwater while reducing the drainage pressure of the municipal drainage pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic cross-sectional structure view of the embodiment of the present application along the length direction of the old road.

[0028] Figure 2 is Figure 1 an enlarged schematic structure view of part A in

[0029] Figure 3 is Figure 1 an enlarged schematic structure view of part B in

[0030] Figure 4 is Figure 1 a schematic cross-sectional structure view taken along line C-C in

[0031] Figure 5 is Figure 4 an enlarged schematic structure view of part D in

[0032] Figure 6 is a schematic cross-sectional structure view of the anti-infiltration component, restricting member and infiltration and drainage pipe joint in the embodiment of the present application.

[0033] Description of reference numerals: 1. Old road; 11. Expansion joint; 2. Rainwater diversion box; 21. Support column; 211. Support platform; 213. Fixed ring platform; 23. Connecting hole; 24. Permeable geotextile; 3. Permeable pavement; 31. Support layer; 311. Water permeable port; 312. Waterproof pipe; 32. Filling layer; 4. Municipal drainage pipe; 5. Infiltration and drainage component; 51. Infiltration and drainage outer pipe; 511. Drainage hole; 512. Infiltration and drainage pipe section; 513. Infiltration and drainage flange; 52. Infiltration and drainage inner rod; 53. Elastic cushion plate; 54. Anti-seepage component; 541. Anti-seepage ring; 542. Anti-seepage plate; 543. Anti-seepage ring groove; 544. Water-absorbing expansion ring; 545. Abuttment pin; 55. Limiting part; 551. Limiting pipe; 552. Limiting strip; 553. Limiting pin; 554. Elastic cushion layer. Specific embodiments

[0034] The following will further describe the present application in detail with reference to the Figure 1-6 accompanying drawings.

[0035] An embodiment of the present application discloses a rainwater diversion system for a sponge city. Referring to Figure 1 , the rainwater diversion system for a sponge city includes a rainwater diversion box 2 disposed between adjacent expansion joints 11 of the old road 1 and a permeable pavement 3 disposed on the top of the rainwater diversion box 2. Among them, the old road 1 is an existing road with poor water permeability, and the expansion joint 11 is a deformation joint provided to adapt to the thermal expansion and contraction of the road during road construction. The permeable pavement 3 smoothly transitions with the old road 1.

[0036] Specifically, the rainwater diversion box 2 is integrally embedded in the inner side of the soil between two adjacent expansion joints 11, and the rainwater diversion box 2 is located in the concave part of the old road 1, such as urban low-lying areas, parts of the road that are concave under overpasses, etc. The permeable pavement 3 is used to infiltrate and drain the runoff on the surface of the old road 1 into the rainwater diversion box 2 and the ground. That is, both the rainwater diversion box 2 and the permeable pavement 3 adopt a permeable structure that can infiltrate and drain water, such as permeable concrete, microporous permeable concrete, and concrete pavement with drainage blind pipes. The rainwater diversion box 2 is preferably formed by casting microporous permeable concrete, and the outer wall of the rainwater diversion box 2 is coated with a permeable geotextile 24 to reduce the possibility of the pores of the rainwater diversion box 2 being blocked. Part of the permeable pavement 3 is formed by casting microporous permeable concrete.

[0037] At the same time, the middle or top of the rainwater diversion box 2 is connected to the municipal drainage pipe 4. In the embodiment of the present application, both opposite ends of the rainwater diversion box 2 in the horizontal direction are connected to the municipal drainage pipe 4. And a device is provided at the bottom of the rainwater diversion box 2 for dispersing and infiltrating and draining the rainwater that has not been timely infiltrated and drained to the underground soil on the periphery of the rainwater diversion box 2.

[0038] In actual application, the permeability of old roads 1 is poor. If you want to drain the rainwater in time, you need to drain the accumulated rainwater to the underground covered by the impermeable ground in time. While replenishing the groundwater through the underground storage and drainage capacity, the infiltration and drainage performance of the old road 1 is increased by increasing the contact area with the soil covered by the ground with poor permeability. Specifically, when it rains, since the permeable pavement 3 and the rainwater diversion box 2 are set in a concave position, the runoff generated by the old road 1 during rain can flow to the permeable pavement 3 and discharge the water into the underground at the same time, so that the rainwater filtered by the permeable pavement 3 and the rainwater diversion box 2 can be drained in time and used to replenish the groundwater; when the rainwater is relatively large and there is no time to drain it, the rainwater will accumulate in the rainwater diversion box 2 until it can flow into the municipal drainage pipe 4.

[0039] At the same time, the rainwater is infiltrated and drained into the soil around the rainwater diversion box 2 through the infiltration and drainage component 5, so as to replenish groundwater when the rainfall is relatively small. When the rainfall is relatively large, not only the groundwater is replenished, but also the drainage pressure can be relieved through the municipal drainage pipe 4, rather than using the municipal drainage pipe 4 as the main drainage method. And compared with the comprehensive infiltration and drainage transformation of the old road 1, which affects the regional road circulation and is relatively expensive, the use of the rainwater diversion box 2 with the infiltration and drainage component 5 only requires adjustments to be made to the local sections of the corresponding area of ​​the old road 1, which can not only reduce costs, but also reduce the impact on existing traffic while achieving the effect of water storage and drainage.

[0040] Reference Figure 1 and Figure 2 In addition, in order to enable the permeable pavement 3 to bear the load of the old road 1 while maintaining the performance of seepage and drainage, the permeable pavement 3 includes a support layer 31 and a filling layer 32. The support layer 31 is cast and formed by reinforced concrete and has a plurality of evenly distributed arrays of permeable openings 311. The permeable openings 311 penetrate the support layer 31 along the thickness direction. The circumferential side walls of the permeable openings 311 are in a frustum-shaped structure and are arranged with the small end opening toward the rainwater diversion box 2. The filling layer 32 is cast and formed by permeable asphalt concrete, and the filling layer 32 covers the outer wall of the support layer 31 away from the rainwater diversion box 2 and the inner side of the permeable opening 311. At this time, the filling layer 32 is used to bear the load, and in this process, the pressure generated by the load of the filling layer 32 is applied to the side wall of the permeable opening 311, thereby limiting the deformation of the filling layer 32 while meeting the permeability performance.

[0041] In order to further reduce the possibility of deformation, part of the steel bars in the support layer 31 penetrate through the water permeable openings 311 to form a support grid, and a waterproof pipe 312, preferably a rubber pipe or a plastic pipe, is sleeved outside the steel bars of the support grid. Moreover, both ends of the waterproof pipe 312 are preset in the support layer 31, so as to support the filling layer 32 in the water permeable opening 311 while reducing the possibility of the rainwater seeping and draining from the filling layer 32 eroding the steel bars in the support layer 31.

[0042] Of course, in other embodiments, the support layer 31 can also be provided with a steel truss coated with a waterproof layer; or the permeable road surface 3 includes a load-bearing road surface formed by pouring impermeable asphalt concrete, a plurality of support seats, and a cushion layer formed by pouring permeable concrete. The load-bearing road surface is formed above the cushion layer. The support seats penetrate through the cushion layer and abut against the top of the rainwater diversion box 2. The cushion layer communicates with both sides of the road, so as to drain the rainwater from below the load-bearing road surface while supporting the load-bearing road surface through the support seats.

[0043] Refer to Figure 1 and Figure 3 Meanwhile, in order to further support the part of the support layer 31 located at the top of the rainwater diversion box 2, support columns 21 penetrate through the rainwater diversion box 2, and a plurality of support columns 21 are provided and are evenly arranged in an array below the permeable road surface 3. The bottom of the support column 21 is used to connect to the rock and soil below the old road 1, that is, the bottom end of the support column 21 is fixedly connected to the stable rock stratum, and the top of the support column 21 abuts against the support layer 31 to support the support layer 31.

[0044] Meanwhile, in order to facilitate the installation of the rainwater diversion box 2 and support the rainwater diversion box 2, through holes corresponding to the support columns 21 are formed at the bottom of the rainwater diversion box 2. A support platform 211 is formed at the part of the support column 21 located below the rainwater diversion box 2. The rainwater diversion box 2 is lapped on the support platform 211, and both the support platform 211 and the support column 21 are made of reinforced concrete. A plurality of connection holes 23 are formed around the support column 21 on the bottom wall of the rainwater diversion box 2, and the connection holes 23 penetrate through and are formed to the support platform 211.

[0045] Part of the steel bars on the support platform 211 penetrate through the connection holes 23 and are fixedly connected to the support column 21, and a fixed ring platform 213 is formed by post-cast concrete of the support column 21. The fixed ring platform 213 fills the connection holes 23, and the bottom wall of the rainwater diversion box 2 is clamped between the fixed ring platform 213 and the support platform 211.

[0046] During construction, first, the road surface corresponding to the concave part of the old road 1 is opened, so that the soil between two adjacent expansion joints 11 of the concave part and the old road 1 are removed. Then, the support columns 21 are formed in the foundation pit excavated in the concave part of the old road 1. Then, the rainwater diversion box 2 is placed on multiple support platforms 211, and the support columns 21 pass through the through holes. Then, at the position corresponding to the connection holes 23 at the bottom of the rainwater diversion box 2, a concrete fixed ring platform 213 is poured to stably fix the rainwater diversion box 2 under the old road 1. After that, the support layer 31 and the filling layer 32 are successively poured and formed, thereby reducing the possibility of the rainwater diversion box 2 settling due to excessive load and reducing the impact on the normal use of the old road 1.

[0047] Refer to Figure 4 and Figure 5 In addition, in order to disperse and drain the rainwater accumulated at the bottom of the rainwater diversion box 2 into the ground, optimize the seepage and drainage performance on the periphery of the old road 1, and reduce the situation where the rainwater on the road surface cannot be drained and the groundwater cannot be replenished in time, multiple drainage components 5 are provided on the rainwater diversion box 2, and the multiple drainage components 5 are arranged around the rainwater diversion box 2.

[0048] Specifically, the drainage component 5 includes a drainage outer pipe 51 and a drainage inner rod 52 arranged inside the drainage outer pipe 51. The drainage outer pipe 51 includes multiple successively spliced drainage pipe sections 512. The drainage pipe sections 512 are inclined and the high ends face the rainwater diversion box 2, and the drainage pipe sections 512 on the side facing the rainwater diversion box 2 in the same drainage outer pipe 51 penetrate through the rainwater diversion box 2. The drainage pipe section 512 penetrating through the rainwater diversion box 2 is bent to form a drainage flange 513. The drainage flange 513 is located inside the rainwater diversion box 2, and an elastic cushion plate 53 is provided between the drainage flange 513 and the inner wall of the rainwater diversion box 2 through which the drainage pipe section 512 penetrates. The drainage pipe section 512 penetrating through the rainwater diversion box 2 penetrates through the elastic cushion plate 53, and the drainage flange 513 is fixedly connected to the inner wall of the rainwater diversion box 2 through anchor bolts to fasten the drainage pipe section 512.

[0049] When installing the drainage pipe section 512, it is only necessary to successively push the drainage pipe section 512 into the soil on the periphery of the rainwater diversion box 2 to reduce the interference of the rainwater diversion box 2 on the installation of the drainage outer pipe 51. Among them, several drainage holes 511 are provided in the drainage pipe sections 512 located outside the drainage pipe section 512 penetrating through the rainwater diversion box 2 to drain the rainwater into the soil on the periphery of the rainwater diversion box 2; the drainage pipe section 512 is a steel pipe section or a precast concrete pipe section.

[0050] Refer to Figure 4 and Figure 5At the same time, the infiltration and drainage inner rod 52 is filled in a plurality of infiltration and drainage pipe segments 512 located outside the infiltration and drainage pipe segments 512 that penetrate the rainwater diversion box 2. The infiltration and drainage inner rod 52 is a porous structure rod formed by hot-melt forming of the contact points of fiber filaments, so that the infiltration and drainage inner rod 52 can connect a plurality of infiltration and drainage pipe segments 512 that are spliced ​​with each other, and also has the function of infiltration and drainage, so that the rainwater inside the rainwater diversion box 2 can be discharged in time, and the groundwater in the soil outside the rainwater diversion box 2 can be filtered, thereby reducing the possibility of sand and soil flowing back into the rainwater diversion box 2.

[0051] Of course, in other embodiments, the drainage assembly 5 includes a drainage pipe with a drainage hole 511 and a guide portion formed at the bottom of the drainage pipe, and the width of the guide portion gradually decreases from the part connected to the rainwater diversion box 2 toward the part away from the rainwater diversion box 2, so as to guide rainwater to a position away from the rainwater diversion box 2 and then discharge it into the ground.

[0052] Reference Figure 5 and Figure 6 In addition, in order to further reduce the possibility of external rock and soil flowing back into the rainwater diversion box 2 during use and causing blockage of the municipal drainage pipe 4, the infiltration and drainage pipe section 512 passing through the rainwater diversion box 2 is provided with a reverse osmosis component 54.

[0053] The reverse osmosis assembly 54 includes a reverse osmosis ring 541 and a reverse osmosis plate 542 for covering the reverse osmosis ring 541. The reverse osmosis ring 541 is coaxially fixedly connected to the seepage pipe section 512 penetrating the rainwater diversion box 2. The reverse osmosis plate 542 is located on the side of the reverse osmosis ring 541 away from the center of the rainwater diversion box 2, and the upper edge of the reverse osmosis plate 542 is hinged to the reverse osmosis ring 541. At the same time, the seepage pipe section 512 penetrating the rainwater diversion box 2 is provided with a limiting member 55, which is used to elastically abut the reverse osmosis plate 542 against the reverse osmosis ring 541 after absorbing water, and the water absorbing end of the limiting member 55 is located on the side of the reverse osmosis plate 542 away from the reverse osmosis ring 541.

[0054] During use, if the external rainwater is relatively large, resulting in a relatively high water content on the sides of the rainwater diversion box 2, and the rainwater inside the rainwater diversion box 2 is relatively small at this time, the limiting member 55 will absorb the moisture extending from the outside of the rainwater diversion box 2 into the infiltration and drainage pipe section 512 and bring the reverse osmosis plate 542 into contact with the reverse osmosis ring 541, so as to limit the external muddy water containing rock and soil from entering the rainwater diversion box 2; and when the rainwater inside the rainwater diversion box 2 is relatively large, the reverse osmosis plate 542 will be pushed to separate from the reverse osmosis ring 541, thereby realizing the infiltration and drainage of rainwater.

[0055] Reference Figure 5 and Figure 6, specifically, the limiting member 55 includes a limiting tube 551, a water-absorbing and swelling limiting strip 552, and a limiting pin 553. The limiting tube 551 is fixedly connected to the bottom wall of the infiltration and drainage pipe section 512 passing through the rainwater diversion box 2, and the limiting tube 551 is located on the side of the anti-seepage plate 542 away from the center of the rainwater diversion box 2. The limiting tube 551 is parallel to the infiltration and drainage pipe section 512, and the end of the limiting tube 551 away from the center of the rainwater diversion box 2 is of a closed structure. The tube wall of the limiting tube 551 is a porous structure so that the external rainwater can infiltrate into the limiting tube 551. The limiting strip 552 is made of water-absorbing and swelling rubber and is filled in the limiting tube 551. One end of the limiting pin 553 is inserted and slidably connected to the end of the limiting tube 551 facing the center of the rainwater diversion box 2, and the end of the limiting pin 553 inserted into the limiting tube 551 is fixedly connected to the limiting strip 552. The end of the limiting strip 552 away from the limiting pin 553 is fixedly connected to the limiting tube 551. Among them, the sliding path of the limiting pin 553 intersects with the rotation path of the lower edge of the anti-seepage plate 542.

[0056] During use, when the water content of the soil outside the rainwater diversion box 2 is relatively high, part of the water will infiltrate into the limiting tube 551 and cause the limiting strip 552 to expand, and push the limiting pin 553 to extend relative to the limiting tube 551 and abut against the anti-seepage plate 542, so as to achieve the anti-seepage effect. At the same time, when the rainwater in the rainwater diversion box 2 is relatively high, a certain pressure will be applied to the anti-seepage plate 542 and the limiting strip 552 will be compressed, so as to open the anti-seepage plate 542 and enable the rainwater to be infiltrated and drained. When the water content of the soil outside the rainwater diversion box 2 is relatively low, the limiting strip 552 will remain contracted and pull the limiting pin 553 away from the anti-seepage plate 542. At this time, the anti-seepage plate 542 can rotate freely relative to the anti-seepage ring 541. When the rainwater in the rainwater diversion box 2 is relatively high subsequently, the anti-seepage plate 542 can be opened in time for infiltration and drainage.

[0057] Refer to Figure 5 and Figure 6 , at the same time, in order to enable the anti-seepage plate 542 to be opened in time, an elastic cushion layer 554 is provided at the end of the limiting pin 553 facing the anti-seepage plate 542 to reduce the resistance to the reverse rotation of the anti-seepage plate 542.

[0058] In addition, in order to reduce the possibility that the backflow prevention plate 542 cannot be drained in time due to excessive rotation resistance when the rainwater in the rainwater diversion box 2 submerges the infiltration and drainage pipe section 512, a backflow prevention ring groove 543 is formed in the backflow prevention ring 541, a water-absorbing expansion ring 544 is arranged in the backflow prevention ring groove 543, and the backflow prevention ring groove 543 is communicated with the inside of the rainwater diversion box 2 through a hole structure penetrating the inner wall of the backflow prevention ring groove 543. A number of abutting pins 545 are inserted and slidably connected to the backflow prevention ring 541. The abutting pins 545 are located on the side of the water-absorbing expansion ring 544 facing the backflow prevention plate 542, the abutting pins 545 are parallel to the central axis of the backflow prevention ring 541, and one end of the abutting pins 545 located in the backflow prevention ring 541 penetrates into the backflow prevention ring groove 543 and is fixedly connected to the water-absorbing expansion ring 544, so that when the water-absorbing expansion ring 544 absorbs the water in the rainwater diversion box 2, it can push the abutting pins 545 to push the backflow prevention plate 542 away from the backflow prevention ring 541. Among them, the abutting pins 545 are located at the bottom of the backflow prevention ring 541.

[0059] The implementation principle of the embodiment of the present application is as follows: during rainfall, the rainwater can penetrate into the rainwater diversion box 2 through the filling layer 32 in time and first drain the rainwater into the soil under the old road 1 through the rainwater diversion box 2. When the rainwater is relatively large, the backflow prevention plate 542 will open and disperse the rainwater through a plurality of infiltration and drainage pipe sections 512 to the soil under and around the old road 1, so that the rock and soil under the relatively poor permeable road surface around the old road 1 can still play the role of draining rainwater; and when the rainwater is too large, the rainwater is discharged through the municipal drainage pipe 4, thereby effectively reducing the possibility of waterlogging while reducing the drainage pressure of the municipal drainage pipe 4.

[0060] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sponge city rainwater diversion system, characterized in that: it includes a rainwater diversion box (2) arranged between adjacent expansion joints (11) of an old road (1) and a permeable road surface (3) arranged on the top of the rainwater diversion box (2). Both the permeable road surface (3) and the rainwater diversion box (2) adopt a permeable structure and are located in the concave part of the old road (1). The middle or top of the rainwater diversion box (2) is connected to a municipal drainage pipe (4). The permeable road surface (3) is smoothly transitioned with the old road (1), and a drainage and infiltration component (5) for dispersing and infiltrating the rainwater that is not discharged in time into the ground is arranged in the rainwater diversion box (2); the drainage and infiltration component (5) includes a drainage and infiltration outer pipe (51) and a drainage and infiltration inner rod (52) arranged inside the drainage and infiltration outer pipe (51). The strength of the drainage and infiltration outer pipe (51) is greater than that of the drainage and infiltration inner rod (52), and a number of drainage holes (511) are opened in the drainage and infiltration outer pipe (51). The drainage and infiltration inner rod (52) is a multi-porous structure rod formed by hot melting the contact points of fiber filaments with each other. One end of the drainage and infiltration outer pipe (51) is connected to the bottom of the rainwater diversion box (2), and the other end of the drainage and infiltration outer pipe (51) extends into the soil on the periphery of the rainwater diversion box (2); the drainage and infiltration outer pipe (51) includes multiple drainage and infiltration pipe sections (512) spliced successively. The drainage and infiltration pipe sections (512) successively penetrate the rainwater diversion box (2) and are pushed into the soil on the periphery of the rainwater diversion box (2). The drainage holes (511) are opened in the drainage and infiltration pipe section (512) located at the part of the multiple drainage and infiltration pipe sections (512) far from the rainwater diversion box (2); the end of the drainage and infiltration outer pipe (51) facing the rainwater diversion box (2) is bent to form a drainage and infiltration flange (513). An elastic cushion plate (53) is arranged between the drainage and infiltration flange (513) and the inner wall of the rainwater diversion box (2), and the drainage and infiltration flange (513) is fixedly connected to the inner wall of the rainwater diversion box (2) through anchor bolts; the outer wall of the rainwater diversion box (2) is coated with a permeable geotextile (24), and an anti-seepage component (54) is arranged on the drainage and infiltration outer pipe (51). The anti-seepage component (54) includes an anti-seepage ring (541) and an anti-seepage plate (542) for covering the anti-seepage ring (541). The anti-seepage ring (541) is coaxially and fixedly connected to the edge of the inlet of the drainage and infiltration outer pipe (51). The anti-seepage plate (542) is hinged to the anti-seepage ring (541) and overlaps at one end of the anti-seepage ring (541) far from the center of the rainwater diversion box (2). A limiting component (55) for elastically abutting the anti-seepage plate (542) against the anti-seepage ring (541) by water absorption and expansion is arranged on the drainage and infiltration outer pipe (51), and the water absorption end of the limiting component (55) is arranged on the side of the anti-seepage plate (542) far from the anti-seepage ring (541).

2. The sponge city rainwater diversion system according to claim 1, characterized in that: The permeable pavement (3) includes a support layer (31) and a filling layer (32) made of permeable asphalt concrete. The support layer (31) is arranged on the top of the rainwater diversion box (2) and is formed with a number of permeable openings (311). The support layer (31) is embedded in the bottom of the filling layer (32). The inner wall of the permeable opening (311) is frustum-shaped with the large end facing away from the opening of the rainwater diversion box (2).

3. A rainwater diversion system for a sponge city according to claim 2, wherein: The support layer (31) is made of reinforced concrete and the steel bars penetrate through the permeable openings (311). A waterproof pipe (312) is sleeved on the part of the steel bars in the support layer (31) located in the permeable openings (311), and both ends of the waterproof pipe (312) are preset in the support layer (31).

4. A rainwater diversion system for a sponge city according to claim 2, wherein: The rainwater diversion box (2) is penetrated by a support column (21). The bottom of the support column (21) is used to connect to the rock and soil under the old road (1). The top of the support column (21) is connected to the support layer (31), and the support column (21) is formed with a support platform (211). The rainwater diversion box (2) is arranged on the support platform (211).

5. A rainwater diversion system for a sponge city according to claim 4, wherein: The part of the rainwater diversion box (2) corresponding to the support column (21) is formed with a number of connection holes (23) penetrating through to the support platform (211). The support platform (211) is made of reinforced concrete and part of the steel bars penetrate through the connection holes (23). The support column (21) is formed with a fixed ring platform (213). The bottom wall of the rainwater diversion box (2) is clamped between the support platform (211) and the fixed ring platform (213), and the fixed ring platform (213) fills the connection holes (23).

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