Anti-blocking water seepage and drainage structure for sponge city

Abstract

The invention relates to the field of seepage and drainage engineering, in particular to a sponge city anti-blocking seepage and drainage structure which comprises a porous water collecting pipe buried underground, filter cloth used for filtering silt is arranged in the porous water collecting pipe, and the side, opposite to the downstream face of the filter cloth, of the bottom of the porous water collecting pipe communicates with a water collecting barrel. The porous water collecting pipe is provided with a backflushing assembly used for pumping out clear water in the water collecting cylinder and impacting the downstream face side of the filter cloth, the side, opposite to the upstream face of the filter cloth, of the bottom of the porous water collecting pipe is communicated with a sludge discharging pipe, and the sludge discharging pipe is provided with a sludge discharging valve electrically connected to the control system. The anti-blocking pipeline has the advantage of improving the anti-blocking performance of the pipeline.

Description

Technical Field

[0001] The present application relates to the field of infiltration and drainage engineering, and in particular to an anti-blocking infiltration and drainage structure for a sponge city. Background Art

[0002] Seepage drainage utilizes porous pipes buried underground to collect underground seepage water and discharge it to a designated location. It is commonly used in drainage systems for underground projects. Its advantage is that it can effectively lower the groundwater level and prevent groundwater from damaging the project structure.

[0003] In the process of collecting groundwater with porous pipes, the groundwater may bring fine particles of sediment into the pipes. After a long period of accumulation, the sediment may cause blockage of the pipes, which is an obvious drawback. Summary of the invention

[0004] In order to improve the problem that sediment accumulation may clog pipes, the present application provides a sponge city anti-blocking seepage and drainage structure.

[0005] The present application provides a sponge city anti-blocking seepage and drainage structure adopts the following technical solution: A sponge city anti-blocking seepage and drainage structure comprises a porous water collecting pipe buried underground, a filter cloth for filtering mud and sand is arranged in the porous water collecting pipe, a water collecting cylinder is connected to the side of the bottom of the porous water collecting pipe opposite to the back water surface of the filter cloth, a recoil component is arranged on the porous water collecting pipe for pumping out clean water in the water collecting cylinder and impacting the back water surface of the filter cloth, a mud discharge pipe is connected to the side of the bottom of the porous water collecting pipe opposite to the water front surface of the filter cloth, and a mud discharge pipe is arranged on the mud discharge pipe.

[0006] By adopting the above technical solution, groundwater enters the porous water collection pipe and is intercepted by the filter cloth. When the filter cloth is blocked, the mud discharge valve is opened, and the backwash component extracts the clean groundwater in the water collection cylinder and impacts the back water surface of the filter cloth, so that the mud and sand blocking the front water surface of the filter cloth can be washed down and discharged through the mud discharge valve. The filter cloth is backwashed and dredged regularly to reduce the possibility of the water collection pipe being blocked.

[0007] Optionally, the recoil assembly includes a recoil valve tube arranged on a porous water collecting pipe and having a hollow interior, the bottom end of the recoil valve tube extends into the porous water collecting pipe and faces the back water surface of the filter cloth, a water suction pipe fixedly extending into the water collecting cylinder is arranged in the recoil valve tube, a lifting valve block is vertically slidable in the water suction pipe, a first one-way valve is arranged at the bottom of the water suction pipe, a motor electrically connected to a control system is arranged outside the recoil valve tube, the output shaft of the motor extends into the recoil valve tube and a turntable is coaxially arranged, and a hinge is provided between the turntable and the lifting valve block A connecting rod is connected, and the hinge between the connecting rod and the turntable is far away from the rotation center of the turntable. A bracket from which a water pumping pipe is extended is also arranged on the lifting valve block. A fixing ring is fixedly sleeved on the outer wall of the water pumping pipe, and a water outlet is opened at a position above the fixing ring between the inner and outer walls of the water pumping pipe. A sealing ring is slidingly sleeved on the water pumping pipe through a pull wire on the bracket, and the sealing ring is located above the fixing ring and is used to seal the water outlet. The fixing ring and the sealing ring are magnetically attracted to each other, and a second one-way valve is connected to a position on the outer wall of the water pumping pipe below the water outlet.

[0008] By adopting the above technical solution, the control system starts the motor, the output shaft of the motor drives the turntable to rotate, and the turntable drives the lifting valve block to move back and forth in the pumping pipe through the connecting rod. When the lifting valve block drives the bracket to move upward, the clean groundwater in the water collection tube is pumped into the pumping pipe, and the bracket stretches the pull wire. Until the lifting valve block moves to near the highest point, the pulling force of the pull wire on the blocking ring is greater than the magnetic attraction between the blocking ring and the fixed ring, the blocking block is separated from the fixed block and pulled upward, and the blocking block releases the blocking effect on the water outlet. At this time, the groundwater in the pumping pipe that is higher than the water outlet flows out of the water outlet into the recoil valve pipe, and is discharged from the bottom of the recoil valve pipe to realize the recoil of the filter cloth. When the lifting valve block descends, the blocking ring moves downward, magnetically attracts the fixed block again and restores the blocking effect on the water outlet. Thereafter, when the lifting valve block continues to descend, the air in the pumping pipe is discharged into the recoil pipe valve pipe through the second one-way valve.

[0009] Optionally, a sealing plate is arranged between the drain pipe and the backflush valve pipe, and the sealing plate is higher than the second one-way valve.

[0010] By adopting the above technical solution, the sealing plate is set so that during the descent of the lifting valve block, the air discharged from the pumping pipe into the recoil valve pipe through the second one-way valve can exert a certain pressure on the outflow of groundwater in the recoil valve pipe, thereby increasing the strength of the groundwater when it is sprayed from the bottom end of the recoil valve pipe onto the filter cloth, which is beneficial to improving the dredging effect of the filter cloth.

[0011] Optionally, the bottom end of the recoil valve tube is plug-fitted and gap-fitted with a fixing column, a rotating sleeve is provided on the fixing column, a spiral channel is opened between the two sides of the rotating block relative to its axial direction, a plurality of elastic sheets are circumferentially arranged on the outer wall of the rotating block, two circumferentially adjacent elastic sheets are tightly attached, the elastic sheets are inclined along the water outlet direction of the bottom end of the recoil valve tube to contact the circumferential outer wall of the fixing column, and a screw cap is provided on the outer wall of the rotating block which is threadedly connected to the outer wall of the bottom end of the recoil valve tube and slides on the rotating sleeve.

[0012] By adopting the above technical solution, when groundwater flows out from the bottom of the recoil valve pipe, the groundwater pushes the elastic sheet to deform slightly, so that the groundwater sprays out from the gap between the elastic sheet and the fixed column. Since the diameter of the gap is small, the strength of the groundwater spraying is enhanced, which improves the recoil effect on the filter cloth. When the groundwater flows through the spiral channel, it will push the rotating block to rotate, thereby changing the recoil position of the groundwater on the filter cloth, thereby improving the comprehensiveness of the recoil dredging of the filter cloth.

[0013] Optionally, the diameter of the spiral channel gradually decreases along the water outlet direction of the bottom end of the recoil valve pipe.

[0014] By adopting the above technical solution, the strength of groundwater spraying onto the filter cloth is further enhanced.

[0015] Optionally, the water collecting cylinder is connected to a ventilation pipe extending to the outside.

[0016] By adopting the above technical solution, when there is no groundwater in the water collecting barrel, the pumping pipe draws air from the outside through the ventilation pipe, and can also backflush the filter cloth. The airflow ejected from the bottom of the recoil valve pipe will blow off the mud and sand blocking the filter cloth, and it has strong applicability.

[0017] Optionally, one end of the ventilation pipe facing the outside is covered with a dust cover.

[0018] By adopting the above technical solution, the dust cover reduces the possibility of external impurities contaminating the clean groundwater in the water collection tube.

[0019] Optionally, the lifting valve block is coated with polytetrafluoroethylene.

[0020] By adopting the above technical solution, the friction coefficient of polytetrafluoroethylene is relatively small, which is beneficial to improving the smoothness of the lifting and lowering movement of the lifting valve block in the water pumping pipe.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the groundwater enters the porous water collection pipe, it is intercepted by the filter cloth. When the filter cloth is blocked, open the mud discharge valve, and the backwash component will pump out the clean groundwater in the water collection cylinder and impact the back water surface of the filter cloth, so that the mud and sand blocking the front water surface of the filter cloth can be washed down and discharged through the mud discharge valve. Regularly backwash and dredge the filter cloth to reduce the possibility of the water collection pipe being blocked; 2. The control system starts the motor, and the output shaft of the motor drives the turntable to rotate. The turntable drives the lifting valve block to move back and forth in the pumping pipe through the connecting rod. When the lifting valve block drives the bracket to move upward, the clean groundwater in the water collecting cylinder is pumped into the pumping pipe, and the bracket stretches the pull wire. Until the lifting valve block moves to near the highest point, the pulling force of the pull wire on the sealing ring is greater than the magnetic attraction between the sealing ring and the fixed ring, and the sealing block is separated from the fixed block and pulled upward. The sealing block releases the blocking effect on the water outlet. At this time, the groundwater in the pumping pipe that is higher than the water outlet flows out of the water outlet into the recoil valve pipe, and is discharged from the bottom of the recoil valve pipe to realize the recoil of the filter cloth. When the lifting valve block descends, the sealing ring moves downward, magnetically attracts the fixed block again and restores the blocking effect on the water outlet. Thereafter, as the lifting valve block continues to descend, the air in the pumping pipe is discharged into the recoil pipe valve tube through the second one-way valve; 3. The sealing plate is set so that when the lifting valve block descends, the air discharged from the water pumping pipe into the recoil valve pipe through the second one-way valve can exert a certain pressure on the outflow of groundwater in the recoil valve pipe, thereby increasing the strength of the groundwater when it is sprayed from the bottom of the recoil valve pipe to the filter cloth, which is beneficial to improving the dredging effect of the filter cloth; 4. When groundwater flows out from the bottom of the recoil valve pipe, the groundwater pushes the elastic sheet to slightly deform, so that the groundwater sprays out from the gap between the elastic sheet and the fixed column. Since the diameter of the gap is small, the strength of the groundwater spraying out is enhanced, which improves the recoil effect on the filter cloth. And when the groundwater flows through the spiral channel, it will push the rotating block to rotate, thereby changing the recoil position of the groundwater on the filter cloth, thereby improving the comprehensiveness of the recoil dredging of the filter cloth; 5. When there is no groundwater in the water collecting cylinder, the pumping pipe draws air from the outside through the ventilation pipe, and can also backflush the filter cloth. The airflow ejected from the bottom of the recoil valve pipe will blow off the mud and sand blocking the filter cloth, which has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application.

[0023] Figure 2 It is a cross-sectional view of an embodiment of the present application.

[0024] Figure 3 yes Figure 2 Enlarged view of part A.

[0025] Figure 4 yes Figure 2 Enlarged view of part B.

[0026] Explanation of the reference numerals in the accompanying drawings: 1. porous water collecting pipe; 2. filter cloth; 3. water collecting cylinder; 4. mud discharge pipe; 5. mud discharge valve; 610. recoil valve pipe; 611. suction pipe; 6111. water outlet hole; 612. lifting valve block; 613. first one-way valve; 614. motor; 615. turntable; 616. connecting rod; 617. bracket; 618. fixing ring; 619. pull wire; 620. sealing ring; 621. second one-way valve; 7. sealing plate; 8. fixing column; 9. rotating block; 91. spiral channel; 10. elastic sheet; 11. screw cap; 12. ventilation pipe; 13. dust cover. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-4 This application is described in further detail.

[0028] The embodiment of the present application discloses a sponge city anti-blocking seepage and drainage structure.

[0029] Reference Figure 1 and Figure 2 The sponge city anti-blocking seepage and drainage structure includes a porous water collecting pipe 1 buried horizontally underground, a filter cloth 2 for filtering sediment is arranged in the porous water collecting pipe 1, a mud discharge pipe 4 is connected to the side of the bottom of the porous water collecting pipe 1 opposite to the water-facing surface of the filter cloth 2, and a mud discharge valve 5 electrically connected to the control system is arranged on the mud discharge pipe 4.

[0030] Reference Figure 2 The bottom of the porous water collecting pipe 1 is connected to a water collecting cylinder 3 on the side opposite to the water back surface of the filter cloth 2, and a backwash component is arranged on the porous water collecting pipe 1. Groundwater flows into the porous water collecting pipe 1, and after the sediment is filtered by the filter cloth 2, part of the clean groundwater is stored in the water collecting cylinder 3.

[0031] When the water-facing surface of the filter cloth 2 is clogged with mud, the backwash component extracts the clean groundwater in the water collecting tube 3 and backwashes the back water surface of the filter cloth 2, so that the mud clogged in the filter cloth 2 can be washed down and discharged from the porous water collecting pipe 1 through the mud discharge valve 5.

[0032] Reference Figure 2 and Figure 3 The recoil assembly includes a recoil valve tube 610 which is welded on the porous water collecting pipe 1 and is hollow inside. The top end of the recoil valve tube 610 is closed, and the bottom end extends into the porous water collecting pipe 1 and faces the back water surface of the filter cloth 2.

[0033] A water suction pipe 611 fixedly transmitted to the water collecting cylinder 3 is arranged in the recoil valve pipe 610, a lifting valve block 612 is vertically slidable in the water suction pipe 611, the lifting valve block 612 is coated with polytetrafluoroethylene, and the bottom end of the water suction pipe 611 is threadedly connected to a first one-way valve 613 near the bottom of the water collecting cylinder 3.

[0034] A motor 614 electrically connected to the control system is bolted to the outside of the recoil valve tube 610. The output shaft of the motor 614 extends into the recoil valve tube 610 and is coaxially arranged with a turntable 615. A connecting rod 616 is hinged between the turntable 615 and the lifting valve block 612. The hinge between the connecting rod 616 and the turntable 615 is far away from the rotation center of the turntable 615.

[0035] Reference Figure 2 and Figure 3 A fixing ring 618 is fixedly sleeved on the pipe body of the water pumping pipe 611 relative to the recoil valve pipe 610 , and a plurality of water outlet holes 6111 are circumferentially opened at a position slightly higher than the fixing ring 618 between the inner and outer walls of the water pumping pipe 611 .

[0036] The top of the lifting valve block 612 is threadedly connected to a T-shaped bracket 617, the top of the bracket 617 is higher than the top of the water pumping pipe 611, and a sliding sleeve is provided on the outer wall of the water pumping pipe 611 with a sealing ring 620 that is higher than the fixed ring 618. A pull wire 619 is tied between the sealing ring 620 and the top of the bracket 617. The sealing ring 620 is used to seal the water outlet 6111, and the sealing ring 620 and the fixed ring 618 are magnetically attracted to each other.

[0037] Reference Figure 2 and Figure 3 The outer wall of the water pumping pipe 611 is also connected with a second one-way valve 621, and the communication position between the second one-way valve 621 and the water pumping pipe 611 is located at the lowest position of the lifting valve block 612. A sealing plate 7 is also welded between the drain pipe and the recoil valve pipe 610, and the sealing plate 7 is higher than the blocking ring 620.

[0038] Reference Figure 2 and Figure 3 The control system starts the motor 614 , the output shaft of the motor 614 drives the turntable 615 to rotate, and the turntable 615 drives the lifting valve block 612 to move back and forth in the water pumping pipe 611 through the connecting rod 616 .

[0039] When the lifting valve block 612 drives the bracket 617 to move upward, the clean groundwater in the water collecting tube 3 is pumped into the pumping pipe 611. At this time, the bracket 617 stretches the pull wire 619, but the fixing ring 618 and the sealing ring 620 are still in a state of attraction.

[0040] Until the lifting valve block 612 moves to near the highest point, the pulling force of the pull wire 619 on the sealing ring 620 is greater than the magnetic attraction between the sealing ring 620 and the fixed ring 618, the sealing block separates from the fixed block and is pulled upward, and the sealing block releases the sealing effect on the water outlet 6111.

[0041] At this time, the groundwater in the water pumping pipe 611 that is higher than the water outlet hole 6111 flows out from the water outlet hole 6111 into the recoil valve pipe 610 , and the air between the recoil valve pipe 610 and the water pumping pipe 611 enters the water pumping pipe 611 .

[0042] When the lifting valve block 612 descends, the sealing ring 620 moves downward, is magnetically attracted to the fixed block again and resumes the sealing effect on the water outlet 6111. Thereafter, as the lifting valve block 612 continues to descend, the air and part of the groundwater in the pumping pipe 611 are discharged into the recoil pipe valve tube through the second one-way valve 621.

[0043] Reference Figure 2 , Figure 3 and Figure 4 The groundwater flowing between the recoil valve pipe 610 and the pumping pipe 611 is ejected from the bottom end of the recoil valve pipe 610 to impact the filter cloth 2, thereby achieving mud removal and dredging of the filter cloth 2.

[0044] Reference Figure 2 , Figure 3 and Figure 4 The bottom end of the recoil valve tube 610 is plugged with a fixed column 8 with clearance, and a rotating block 9 is rotatably sleeved on the fixed column 8. A spiral channel 91 is opened between the two sides of the rotating block 9 relative to its axial direction. A plurality of elastic sheets 10 are circumferentially bolted on the outer wall of the rotating block 9. Two circumferentially adjacent elastic sheets 10 are tightly attached, and the elastic sheets 10 are inclined along the water outlet direction of the bottom end of the recoil valve tube 610 to abut against the circumferential outer wall of the fixed column 8. The outer wall of the rotating block 9 slides and rotates, and a rotating cover 11 is threadedly connected to the outer wall of the bottom end of the recoil valve tube 610.

[0045] Reference Figure 2 , Figure 3 and Figure 4 During the descent of the lifting valve block 612, the groundwater and air flowing out of the second one-way valve 621 exert a certain pressure on the outflow of the original groundwater at the bottom of the recoil valve tube 610. The groundwater pushes the elastic sheet 10 to deform slightly, so that the groundwater is ejected from the gap between the elastic sheet 10 and the fixed column 8. Since the diameter of the gap is small, the strength of the groundwater is enhanced when it is ejected, thereby improving the recoil effect on the filter cloth 2.

[0046] Moreover, when groundwater flows through the spiral channel 91 , it will push the rotating block 9 to rotate, thereby changing the recoil position of the groundwater on the filter cloth 2 , thereby improving the comprehensiveness of the recoil dredging of the filter cloth 2 .

[0047] Reference Figure 4 The diameter of the spiral channel 91 gradually decreases along the water outlet direction of the bottom end of the recoil valve pipe 610, further enhancing the strength of the groundwater spraying onto the filter cloth 2.

[0048] Reference Figure 1 A vent pipe 12 extending to the outside is connected to the water collecting cylinder 3 near its top, and a dust cover 13 is covered on one end of the vent pipe 12 located outside.

[0049] When there is no groundwater in the water collecting barrel 3, the pumping pipe 611 draws air from the outside through the ventilation pipe 12, and can also backflush the filter cloth 2. The airflow ejected from the bottom of the recoil valve pipe 610 will blow down the mud and sand blocking the filter cloth 2, which has strong applicability.

[0050] The implementation principle of the sponge city anti-blocking seepage and drainage structure in the embodiment of the present application is: The control system starts the motor 614 , and the output shaft of the motor 614 drives the turntable 615 to rotate. The turntable 615 drives the lifting valve block 612 to move up and down in the water pumping pipe 611 through the connecting rod 616 .

[0051] When the lifting valve block 612 drives the bracket 617 to move upward, the clean groundwater in the water collection tube 3 is pumped into the pumping pipe 611. At this time, the bracket 617 stretches the pull wire 619, but the fixed ring 618 and the blocking ring 620 are still in an attractive state. When the lifting valve block 612 moves to near the highest point, the pulling force of the pull wire 619 on the blocking ring 620 is greater than the magnetic attraction between the blocking ring 620 and the fixed ring 618, and the blocking block is separated from the fixed block and pulled upward, and the blocking block releases the blocking effect on the water outlet 6111. At this time, the groundwater in the pumping pipe 611 that is higher than the water outlet 6111 flows out from the water outlet 6111 to the recoil valve pipe 610, and the air between the recoil valve pipe 610 and the pumping pipe 611 enters the pumping pipe 611.

[0052] When the lifting valve block 612 descends, the blocking ring 620 moves downward, magnetically attracts the fixed block again and resumes the blocking effect on the water outlet 6111. After that, as the lifting valve block 612 continues to descend, the air in the pumping pipe 611 and part of the groundwater are discharged into the valve pipe of the recoil pipe through the second one-way valve 621. The groundwater flows through the spiral channel 91, pushing the rotating block 9 to drive the elastic sheet 10 to rotate, and the groundwater also pushes the elastic sheet 10 to undergo a slight deformation, so that the groundwater is sprayed from the gap between the elastic sheet 10 and the fixed column 8 onto the filter cloth 2 to realize recoil mud removal.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sponge city anti-blocking seepage and drainage structure, characterized by: The invention comprises a porous water collecting pipe (1) buried underground, wherein a filter cloth (2) for filtering mud and sand is arranged in the porous water collecting pipe (1), a water collecting cylinder (3) is connected to the bottom of the porous water collecting pipe (1) on the side opposite to the water surface of the filter cloth (2), a backwash component is arranged on the porous water collecting pipe (1) for extracting clean water in the water collecting cylinder (3) and impacting the water surface of the filter cloth (2), a mud discharge pipe (4) is connected to the bottom of the porous water collecting pipe (1) on the side opposite to the water surface of the filter cloth (2), and a mud discharge valve (5) electrically connected to the control system is arranged on the mud discharge pipe (4).

2. The anti-blocking seepage and drainage structure of sponge city according to claim 1 is characterized by: The backflush assembly comprises a backflush valve pipe (610) which is arranged on a porous water collecting pipe (1) and is hollow inside. The bottom end of the backflush valve pipe (610) extends into the porous water collecting pipe (1) and faces the back water surface of the filter cloth (2). A water suction pipe (611) which is fixed and passes through the water collecting cylinder (3) is arranged inside the backflush valve pipe (610). A lifting valve block (612) is vertically slidable inside the water suction pipe (611). A first non-return valve (613) is arranged at the bottom of the water suction pipe (611). A motor (614) which is electrically connected to a control system is arranged outside the backflush valve pipe (610). The output shaft of the motor (614) extends into the backflush valve pipe (610) and is coaxially arranged with a rotating disk (615). A connecting rod (616) is hinged between the rotating disk (615) and the lifting valve block (612). The connecting rod (616) is connected to the backflush valve pipe (610). The hinge of the rotating disk (615) is far away from the rotation center of the rotating disk (615). The lifting valve block (612) is also provided with a bracket (617) from which a water pumping pipe (611) is extended. A fixing ring (618) is fixedly sleeved on the outer wall of the water pumping pipe (611). A water outlet (6111) is opened between the inner and outer walls of the water pumping pipe (611) at a position above the fixing ring (618). A blocking ring (620) is slidably sleeved on the water pumping pipe (611) via a pull line (619) on the bracket (617). The blocking ring (620) is located above the fixing ring (618) and is used to block the water outlet (6111). The fixing ring (618) and the blocking ring (620) are magnetically attracted to each other. A second one-way valve (621) is connected to a position of the outer wall of the water pumping pipe (611) below the water outlet (6111).

3. The anti-blocking seepage and drainage structure of sponge city according to claim 2 is characterized by: A sealing plate (7) is arranged between the drain pipe and the backflush valve pipe (610), and the sealing plate (7) is higher than the second one-way valve (621).

4. The anti-blocking seepage and drainage structure of sponge city according to claim 2 is characterized by: The bottom end of the recoil valve tube (610) is plug-fitted with a fixing column (8) and is clearance-fitted therewith. A rotating block (9) is rotatably sleeved on the fixing column (8). A spiral channel (91) is opened between the two sides of the rotating block (9) relative to its axial direction. A plurality of elastic sheets (10) are circumferentially arranged on the outer wall of the rotating block (9). Two circumferentially adjacent elastic sheets (10) are tightly attached. The elastic sheets (10) are inclined along the water outlet direction of the bottom end of the recoil valve tube (610) to abut against the circumferential outer wall of the fixing column (8). A screw cap (11) is slidably and rotatably sleeved on the outer wall of the rotating block (9) and is threadedly connected to the outer wall of the bottom end of the recoil valve tube (610).

5. The anti-blocking seepage and drainage structure of sponge city according to claim 4 is characterized by: The diameter of the spiral channel (91) gradually decreases along the water outlet direction of the bottom end of the recoil valve pipe (610).

6. The anti-blocking seepage and drainage structure of sponge city according to claim 1 is characterized by: The water collecting cylinder (3) is connected to a ventilation pipe (12) extending to the outside.

7. The anti-blocking seepage and drainage structure of sponge city according to claim 6 is characterized by: One end of the ventilation pipe (12) located outside is covered with a dust cover (13).

8. The anti-blocking seepage and drainage structure of sponge city according to claim 2 is characterized by: The lifting valve block (612) is coated with polytetrafluoroethylene.

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