CN112160401A

CN112160401A - Municipal administration rainwater drainage system

Info

Publication number: CN112160401A
Application number: CN202011028018.4A
Authority: CN
Inventors: 陈晓彬
Original assignee: Shenzhen Longjinda Industrial Co ltd
Current assignee: Shenzhen Longjinda Industrial Co ltd
Priority date: 2020-09-26
Filing date: 2020-09-26
Publication date: 2021-01-01
Anticipated expiration: 2040-09-26
Also published as: CN112160401B

Abstract

The invention relates to a municipal rainwater drainage system, which comprises a water collecting port on a road, a water collecting pipe communicated with the water collecting port, and a primary filtering device which is arranged at the water collecting port and can filter large-volume sundry garbage to a certain extent, wherein one end of the water collecting pipe, which is far away from the water collecting port, is fixedly connected with a branch pipe box, the bottom surface of the branch pipe box is communicated with a sewage pipe, the side surface of the branch pipe box, which is far away from the sewage pipe, is communicated with a purified water pipe, the purified water pipe is closely and slidably connected with a purified water pipe gate capable of sealing the purified water pipe, the sewage pipe is provided with a gate control device capable of controlling the purified water pipe gate to move, and after rainwater enters the branch pipe box and is relatively clean, the gate of a water inlet pipe can be opened, so that relatively clean rainwater can directly enter the purified water pipe, the.

Description

Municipal administration rainwater drainage system

Technical Field

The invention relates to the technical field of rainwater treatment, in particular to a municipal rainwater drainage system.

Background

Urban rainwater is a precious water resource, but simultaneously the rainwater that falls to the earth's surface also can sneak into subaerial various rubbish debris and germ bacterium for the rainwater becomes sewage, and when the rainfall is great, makes urban underground rainwater pipeline take place to bear great load easily, needs practical and reliable to urban municipal rainwater drainage system for this reason, can deal with the multiple condition simultaneously.

Rainwater generally can all enter into in the municipal pipeline through the inspection shaft lid on roadside or the rainwater grate on roadside among the current municipal rainwater processing procedure and concentrate the collection and handle, then in unified emission to near water.

Aiming at the related technologies, the inventor thinks that the rainwater in the whole rainfall process can be discharged into the municipal pipeline together, but a large amount of rainwater in the middle and later periods of rainfall is clean and can be directly discharged into a water body without treatment, and if the rainwater is directly discharged into the municipal pipeline, the defect that the load of rainwater treatment is only increased is overcome.

Disclosure of Invention

In order to reduce the burden that rainfall in-process rainwater was handled, this application provides a municipal rainwater drainage system.

The application provides a municipal administration rainwater drainage system adopts following technical scheme:

the utility model provides a municipal administration rainwater discharge system, includes the water catch bowl, feeds through in the collector pipe of water catch bowl, locates water catch bowl department and can carry out the filterable preliminary filter equipment of certain degree with bulky debris rubbish, the collector pipe is kept away from water catch bowl one end fixedly connected with and is divided the pipe case, and branch bottom of the case face intercommunication has the sewage pipe, and the side intercommunication that the sewage pipe was kept away from to the branch pipe case has the water purification pipe, and the inseparable sliding connection of water purification pipe has can carry out confined water purification pipe gate with the water purification pipe, and the sewage pipe is equipped with the gate control device that can control the water purification pipe gate after the rainfall certain time and.

Through adopting above-mentioned technical scheme, the rainfall just begins, the rainwater carries more dust impurity to get into to the branch pipe box, convey and discharge after handling through sewage treatment system by the sewage pipe, after the rainfall certain time, it is comparatively clean to get into the rainwater in the collector pipe, inlet tube gate opens this moment, make in the water that relatively clean a large amount of rainwater directly discharges to near through the water purification pipe, make sewage treatment system's treatment pressure obtain reducing, avoid sewage treatment system need bear great load, sewage treatment system also need not select a great sewage treatment design value when building the design simultaneously, and make the throughput at sewage treatment system at ordinary times surplus greatly.

Preferably, gate control device is including the sewage case that communicates in sewage pipe far away from header box one end, the ball arm that removes along vertical direction, locate the ball arm and can drive the floater that the ball arm removed, fixed connection is in the ball arm and along the montant of vertical direction sliding connection in sewage incasement wall, fixed connection is in the vertical tapered wedge of montant, sliding connection in the inside top surface of sewage case and with the horizontal tapered wedge of the inclined plane looks butt of vertical tapered wedge, fixed connection is close to the closing plate of sewage pipe one end in horizontal tapered wedge, locate the montant and drive the gate moving mechanism that the water purification pipe gate removed.

Through adopting above-mentioned technical scheme, along with rainfall time's lapse in the sewage case, thereby make the sewage case rainwater gather and lead to the liquid level to rise then and make the floater come-up, the floater can drive the montant and shift up, the montant drives vertical tapered wedge and shifts up, vertical tapered wedge promotes the horizontal tapered wedge of corresponding complex and removes, horizontal tapered wedge drives the closing plate and moves, reduce the inflow in the sewage case, make inflow and the water yield in the sewage case maintain balanced so that the floater no longer removes slowly, the moving direction of closing plate can not cause great pressure for the come-up of floater because of rivers get into the sewage case simultaneously for the level.

Preferably, the position, on the top surface of the inside of the sewage tank, of the sewage pipe is slidably connected with a driven closing plate arranged opposite to the closing plate, the driven closing plate and the closing plate are both fixedly connected with driving racks on the near sides, and the two driving racks are meshed with driving gears rotatably connected to the top surface of the inside of the sewage tank.

Through adopting above-mentioned technical scheme for the removal of montant can drive the closing plate and move in opposite directions with driven closing plate, makes the inflow of sewage case to receive to make corresponding comparatively obvious change better at the in-process that the montant removed then.

Preferably, two guide rods of sewage incasement wall fixedly connected with, the guide rod groove has all been seted up to the close vertical side of two guide rods, and two relative vertical sides of montant all rotate and are connected with a set of pulley, and two sets of pulleys are respectively along vertical direction roll connection in two guide rod grooves.

Through adopting above-mentioned technical scheme for the montant carries out the in-process that removes under the drive of floater can more smoothly drive the montant and remove, also can reduce simultaneously in the sewage case long-term intake and probably move the influence that causes to the montant, makes the montant can keep a comparatively smooth and easy removal for a long time as far as possible.

Preferably, gate moving mechanism includes that fixed connection exposes sewage case upper portion one end and can change the perpendicular telescopic link of self length in the montant, fixed connection in the pipe pole of water purification socle portion, fixed connection in the water purification pipe gate expose the gate pole of water purification pipe partial, both ends articulate respectively in the rotation telescopic link of pipe pole and gate pole, cup joint in rotation telescopic link and both ends respectively fixed connection in the promotion spring at rotation telescopic link both ends, erect telescopic link upper end fixed connection in gate pole.

By adopting the technical scheme, when the vertical rod is driven by the floating ball to move upwards, the length of the vertical telescopic rod is firstly shortened, the purified water pipe gate cannot be directly moved, the rainwater is prevented from possibly entering the purified water pipe when the rainwater entering the branch pipe box is still dirty in the early rainfall stage, when the floating ball continues to move upwards to drive the rotating telescopic rod to rotate, the rotating telescopic rod is shortened, when one end of the rotating telescopic rod hinged to the gate rod is higher than one end of the rotating telescopic rod hinged to the pipe rod, the rotating telescopic rod is forced to extend by the pushing spring, the purified water pipe gate moves upwards, then a large amount of clean rainwater entering the branch pipe box can be discharged through the fully-opened purified water pipe, and at the moment, the vertical telescopic rod extends, so that the pushing spring can push the purified water pipe gate to move upwards without driving the balancing weight, and when one end of the rotating telescopic, the pushing spring can prevent the water purifying pipe gate from moving upwards easily, and the water purifying pipe can obtain a better closing function of the water purifying pipe gate.

Preferably, the bottom of the water purification pipe is provided with a lower seepage hole communicated with the inside of the water purification pipe, and the lower part of the water purification pipe is provided with a geotextile which is attached to the geotextile.

Through adopting above-mentioned technical scheme, can carry out the soil layer of downflow below to the water purification pipe through infiltration hole down when comparatively clean rainwater passes through the water purification pipe, then supply groundwater, geotechnological cloth makes the difficult entering of soil outside the water purification pipe to the water purification pipe in simultaneously.

Preferably, preliminary filtering device including can dismantle connect in the grid lid of catchmenting the mouth opening part, fixed connection in the pipe, fixed connection of permeating water of grid lid bottom surface just are the porous disk of slope in permeating water tub end.

Through adopting above-mentioned technical scheme, pipe and porous disk of permeating water make great debris rubbish can not enter into to the branch pipe box through the collector pipe in, avoid leading to water purification pipe or sewer pipe easily and take place the condition of blockking up, take out the grid lid simultaneously, can take the pipe and the porous disk of permeating water together to clear up or change in the lump the porous disk.

Preferably, the collector pipe intercommunication has the collecting pipe, and the collecting pipe is arranged in the collector pipe one end fixedly connected with and decides the board, decides the board upper surface and has seted up and decides the board groove, and the pipe that the vertical side minimum point department fixedly connected with of pipe that permeates water was linked together moves the pipe, moves the pipe and keeps away from the pipe one end fixedly connected with that permeates water and can peg graft in the picture peg of deciding the board groove, decides the board orientation permeate water and manages the vertical side of one end and set up the pipe chase that communicates in deciding the board groove, moves the pipe and can get.

Through adopting above-mentioned technical scheme, correspond the picture peg and peg graft in deciding the board groove, make simultaneously move the pipe and correspond and get into to the tube seat in, can make move the pipe and decide corresponding intercommunication between the pipe for can be under the impact of rivers in the accumulational rubbish debris of porous disk upper surface can move the pipe and decide the pipe and get into the collecting pipe, carry out centralized processing, it is comparatively convenient.

Preferably, the water collecting pipe is communicated with a sharing pipe which is inclined, one end of the sharing pipe communicated with the water collecting pipe is a low point, one end of the sharing pipe, which is far away from the water collecting pipe, is communicated with a water storage tank, the water storage tank is communicated with a water pump, and a water outlet of the water pump is communicated with the water purifying pipe.

Through adopting above-mentioned technical scheme, when rainfall is great, when clean water pipe and sewage pipe all are not enough to carry the rainwater in time, the rainwater gathers in the branch pipe box for the rainwater sneaks into to the collector pipe, get into to sharing in the pipe until the rainwater, make too much rainwater can get into to the water storage tank in, the water pump can carry out a timely taking away with the rainwater in the water storage tank, so that the rainwater is gone out from catchment mouth department, the sharing pipe of slope makes the rainwater under the normal condition difficult to get into to the water storage tank through sharing the pipe simultaneously.

Preferably, the bottom of the branch pipe box is inclined and the bottom surface of the branch pipe box is close to one side of the purified water pipe and is the lowest point, the sewage pipe is inclined and one end of the low point of the sewage pipe is far away from the purified water pipe, the sewage pipe is communicated with one side of the low point of the bottom surface of the branch pipe box, and one end of the purified water pipe communicated with the branch pipe box is inclined and the inclined direction of the inclined end of the purified water pipe is consistent with the inclined direction of the bottom surface of the branch pipe box.

Through adopting above-mentioned technical scheme for rainwater at the rainfall initial stage can comparatively fully enter into to the sewage pipe in, when later stage water purification pipe gate was opened in the rainfall simultaneously, comparatively clean rainwater can be complied with and is the slope and divide the bottom of the case face of the case direct flow to be the slope in the lump in the water purification pipe, also can have certain rainwater to get into the sewage pipe simultaneously and maintain the liquid level height in the sewage case.

In summary, the invention includes at least one of the following beneficial technical effects:

when the rain falls for a certain time, the rainwater entering the water collecting pipe is relatively clean, and at the moment, a gate of the water inlet pipe is opened, so that a large amount of clean rainwater is directly discharged to a nearby water body through the water purifying pipe, the treatment pressure of the sewage treatment system is reduced, the sewage treatment system is prevented from bearing a large load, and meanwhile, the sewage treatment system does not need to select a large sewage treatment design value during construction design, so that the treatment capacity of the sewage treatment system is greatly surplus at ordinary times;

rainwater at the early stage of rainfall can relatively fully enter into the sewage pipe, and when the purified water pipe gate is opened at the middle and later stages of rainfall, relatively clean rainwater can directly flow to the purified water pipe which is inclined together along with the bottom surface of the inclined branch pipe box in a compliant manner, and meanwhile certain rainwater can enter into the sewage pipe to maintain the liquid level in the sewage pipe.

Drawings

FIG. 1 is a schematic diagram of the main structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the upper end of the water collecting pipe, partially cut away from the bottom of the fixed plate, and partially cut away from the side of the sewage tank;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a side sectional view of the waste water tank with an adjusted view compared to FIG. 2;

FIG. 5 is an enlarged view at B in FIG. 4;

FIG. 6 is an enlarged view at C of FIG. 4;

fig. 7 is an enlarged view at D in fig. 1.

In the figure, 1, a water collecting port; 2. a water collection pipe; 21. a plate fixing groove; 22. a moving pipe; 23. inserting plates; 24. a pipe groove; 25. sharing the pipe; 26. a water storage tank; 27. a water pump; 28. a guide bar groove; 29. a balancing weight; 3. a preliminary filtering device; 31. a gate rod; 32. a push spring; 33. downward seeping holes; 34. geotextile; 35. a grid cover; 36. a water permeable pipe; 37. a water permeable plate; 38. a collection pipe; 39. fixing a plate; 4. a tube separating box; 41. a closing plate; 42. a driven closing plate; 43. driving the rack; 44. driving the gear; 45. a guide bar; 46. a pulley; 47. erecting a telescopic rod; 48. a pipe rod; 49. rotating the telescopic rod; 5. a sewage pipe; 51. a water purifying pipe; 52. a water purification pipe gate; 53. a sewage tank; 54. a cue stick; 55. a floating ball; 56. a vertical rod; 57. a vertical tapered wedge; 59. a horizontal wedge block.

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings.

The embodiment of the application discloses a municipal rainwater drainage system, referring to fig. 1, comprising a water collecting opening 1 which is flush with the ground, a primary filtering device 3 which can filter large-volume debris rubbish to a certain degree is arranged at the water collecting opening 1, a vertical water collecting pipe 2 is communicated with the lower part of the water collecting opening 1, a branch pipe box 4 which is communicated with the bottom end of the water collecting pipe 2 is fixedly connected with the bottom surface of the branch pipe box 4, a sewage pipe 5 which is communicated with the bottom surface of the branch pipe box 4 is fixedly connected with the bottom surface of the branch pipe box 4, a purified water pipe gate 52 which can seal the purified water pipe 51 is tightly and slidably connected with the purified water pipe 51 in the vertical direction close to one end of the branch pipe box 4, a gate control device which can control the purified water pipe gate 52 to move after rainfall for a certain time is arranged on the sewage pipe 5, the bottom surface of the branch pipe box 4 is inclined, one side of the bottom surface of the branch pipe 4 close, the foul water pipe 5 is connected to the lower side of the bottom of the branched box 4, and the clean water pipe 51 is connected to one end of the branched box 4 in an inclined manner, and the inclined direction of the inclined end of the clean water pipe 51 is consistent with the inclined direction of the bottom of the branched box 4.

Referring to fig. 2 and 3, the preliminary filtering device 3 includes a grid cover 35 detachably connected to the water collecting port 1 in a vertical direction by means of embedding, the ground of the grid cover 35 is fixedly connected with a vertical permeable pipe 36 which is communicated with the ground, the bottom end of the permeable pipe 36 is fixedly connected with an inclined permeable plate 37, the permeable pipe 36 and the permeable plate 37 are uniformly perforated with a plurality of holes so that rainwater can pass through the permeable pipe 36 and the permeable plate 37, the water collecting pipe 2 is fixedly connected with a communicated and inclined collecting pipe 38, the collecting pipe 38 can concentrate large garbage impurities entering the collecting pipe for treatment, one end of the collecting pipe 38 close to the water collecting pipe 2 is a low point, one end of the collecting pipe 38 at the low point is located in the water collecting pipe 2, one end of the collecting pipe 38 at the low point is fixedly connected with a vertical fixing plate 39, the upper surface of the fixing plate 39 is provided with a vertical fixing plate groove 21, the fixing plate 39 close to the vertical side surface of the permeable, the upper surface in fixed plate 39 is run through to pipe chase 24, and the pipe 22 that leads to water 36 and be located the quick-witted movable pipe 22 that is linked together of porous disk 37 low point one side fixedly connected with that leads to, and quick-witted movable pipe 22 is close to fixed plate 39 one end fixedly connected with and can follows the picture peg 23 of vertical direction grafting in fixed plate groove 21, and quick-witted movable pipe 22 follows vertical direction and pegs graft in pipe chase 24, and the one end that moves pipe 22 and collecting pipe 38 and connect collector pipe 2 all is the slope and the incline direction of incline direction and porous disk 37 is unan.

Referring to fig. 1, the position department fixedly connected with that the outer wall of collector pipe 2 is located the collecting pipe 38 below is linked together and is the sharing pipe 25 of slope, sharing pipe 25 is the slope and shares pipe 25 and connects collector pipe 2 one end and be the low point, sharing pipe 25 keeps away from storage water tank 26 that collector pipe 2 one end fixedly connected with is linked together, storage water tank 26 intercommunication has water pump 27, the delivery port of water pump 27 can communicate in water purification pipe 51, the rainwater in storage water tank 26 also can directly be carried to near water and discharge to the delivery port of water pump 27, water purification pipe 51 inner wall bottom has run through along vertical direction and has seted up infiltration hole 33 down, infiltration hole 33 evenly sets up the several along water purification pipe 51's length direction down, the cladding of water purification pipe 51 outer wall lower part has geotech.

Referring to fig. 2 and 4, the gate control device comprises a sewage tank 53 fixedly connected to one end of the sewage pipe 5 far from the header tank 4, the capability of the sewage pipe 5 to feed water into the sewage tank 53 is greater than the capability of the sewage tank 53 to convey sewage to the municipal sewage treatment system, as shown in fig. 5, two vertical guide rods 45 are fixedly connected to the vertical inner wall of the sewage tank 53, guide rod grooves 28 are formed in the vertical direction of the two adjacent vertical side surfaces of the two guide rods 45, a vertical rod 56 moving in the vertical direction is installed between the two guide rods 45, a group of two pulleys 46 in each group are rotatably connected to the two opposite vertical side surfaces of the vertical rod 56, the two groups of pulleys 46 are respectively connected to the two guide rod grooves 28 in a rolling manner, the vertical rod 56 is fixedly connected to a horizontal floating rod 54, one end of the floating rod 54 far from the vertical rod 56 is fixedly connected to a floating ball 55, the vertical rod 56 is fixedly connected to a vertical wedge block 57, and a horizontal wedge 59 The inclined planes of the horizontal wedge block 59 and the vertical wedge block 57 are abutted, so that the vertical wedge block 57 moves in the vertical direction when abutted against the horizontal wedge block 59 and can drive the horizontal wedge block 59 to move horizontally, one end of the horizontal wedge block 59, which is far away from the vertical wedge block 57, is fixedly connected with the sealing plate 41, the top surface inside the sewage tank 53 is slidably connected with the driven sealing plate 42 along the radial direction of the communication port between the sewage pipe 5 and the sewage tank 53, as shown in the combination of fig. 6, one side, close to the driven sealing plate 42 and the sealing plate 41, of the driven sealing plate 42 is fixedly connected with the driving rack 43, and the two driving racks 43 are engaged with the same driving gear 44 which is rotatably connected to the top surface inside the sewage tank 53, so that the driven sealing plate.

Referring to fig. 1 and 7, a gate moving mechanism for driving the purified water pipe gate 52 to move is installed at one end of the vertical rod 56 penetrating through the sewage tank 53 along the vertical direction, the gate moving mechanism includes a vertical telescopic rod 47 fixedly connected to the upper end of the vertical rod 56 and capable of changing its length, a portion of the purified water pipe gate 52 exposed out of the purified water pipe 51 is fixedly connected with a vertical gate rod 31, the bottom end of the gate rod 31 is fixedly connected to the upper end of the vertical telescopic rod 47, a vertical pipe rod 48 is fixedly connected to the bottom of the outer wall of the purified water pipe 51, a rotary telescopic rod 49 with a vertical rotation plane is hinged to the bottom end of the pipe rod 48, one end of the rotary telescopic rod 49 away from the pipe rod 48 is hinged to the gate rod 31, the rotary telescopic rod 49 is sleeved with a push spring 32, two ends of the push spring 32 are respectively fixedly connected to, the part of the vertical rod 56 in the waste water tank 53 is fixedly connected with a counterweight 29 (shown in combination with fig. 5), and the counterweight 29 enables the purified water pipe 51 to be closed by the purified water pipe gate 52.

The municipal rainwater drainage system of the embodiment of the application implements the principle as follows: during rainfall, rainwater carrying more impurities and impurities enters the permeable pipe 36 through the grid cover 35, then impurities enter the movable pipe 22 along the inclined surface of the permeable plate 37, then concentrated collection and treatment are carried out through the collecting pipe 38, dirty rainwater enters the branch pipe box 4 through the water collecting pipe 2 and then enters the sewage box 53 through the sewage pipe 5, the liquid level in the sewage box 53 continuously rises along with the continuous rainfall or the increase of rainfall, so that the floating ball 55 can drive the vertical rod 56 to rise along the vertical direction, then the vertical rod 56 drives the vertical wedge 57 to be close to the horizontal wedge 59, when the horizontal wedge 59 is abutted with the vertical wedge 57, the horizontal wedge 59 drives the sealing plate 41 and the driven sealing plate 42 to move towards each other, the water inflow of the sewage box 53 is slowly reduced until the water inflow and the water outflow of the sewage box 53 are level, and in the process that the vertical rod 56 just starts to move, the vertical rod 56 drives the vertical telescopic rod 47 to shorten, when the vertical wedge 57 abuts against the horizontal wedge 59, the vertical telescopic rod 47 can not be shortened, at this time, the gate rod 31 is driven by the vertical telescopic rod 47 to move upwards, so that the purified water pipe gate 52 moves upwards along the vertical direction, at this time, part of rainwater can enter the purified water pipe 51, when the water inlet and outlet of the sewage tank 53 are level, the height of one end of the rotating telescopic rod 49 hinged with the gate rod 31 is just higher than that of one end of the rotating telescopic rod 49 hinged with the pipe rod 48, at this time, the push spring 32 forces the rotating telescopic rod 49 to extend, so that the gate rod 31 moves upwards, the gate rod 31 drives the purified water pipe gate 52 to move upwards, so that the purified water pipe 51 is completely opened, when the gate rod 31 moves upwards, the vertical telescopic rod 47 extends, so that the gate rod 31 does not drive the vertical rod 56 to move upwards together, when the amount of precipitation is reduced, the rainwater entering, the liquid level in the sewage tank 53 is lowered, and the counterweight 29 drives the vertical rod 56 to move downwards, so that the purified water pipe 51 can be closed by the purified water pipe gate 52.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a municipal administration rainwater drainage system, includes catchment mouth (1), communicates in collector pipe (2) of catchment mouth (1), locates catchment mouth (1) and can carry out filterable prefilter unit (3) of certain degree with bulky debris rubbish, its characterized in that: the utility model discloses a rain water pipe, including water collection mouth (1), water collection pipe (2), water purification pipe (51), clear water pipe gate (52), the side intercommunication that water collection mouth (1) one end fixedly connected with was kept away from in water collection pipe (2) has water distribution box (4), water distribution box (4) bottom surface intercommunication has sewage pipe (5), water distribution box (4) are kept away from sewage pipe (5) has clear water pipe (51), clear water pipe (51) inseparable sliding connection has can carry out confined clear water pipe gate (52) with clear water pipe (51), sewage pipe (5) are equipped with the gate controlling means that can control clear water pipe.

2. The municipal rainwater drainage system of claim 1, wherein: the gate control device comprises a sewage tank (53) communicated with one end of the sewage pipe (5) far away from the header box (4), a floating ball rod (54) moving along the vertical direction, a floating ball (55) arranged on the floating ball rod (54) and capable of driving the floating ball rod (54) to move, a vertical rod (56) fixedly connected to the floating ball rod (54) and slidably connected to the inner wall of the sewage tank (53) along the vertical direction, a vertical wedge block (57) fixedly connected to the vertical rod (56), a horizontal wedge block (59) slidably connected to the inner top surface of the sewage tank (53) and abutted to the inclined surface of the vertical wedge block (57), a sealing plate (41) fixedly connected to the horizontal wedge block (59) and close to one end of the sewage pipe (5), and a gate moving mechanism arranged on the vertical rod (56) and driving a water purifying pipe gate (52) to move.

3. A municipal rainwater drainage system according to claim 2, wherein: the sewage tank is characterized in that a driven closing plate (42) arranged opposite to the closing plate (41) is slidably connected to the inner top surface of the sewage tank (53) at the position of the sewage pipe (5), the driven closing plate (42) and the closing plate (41) are fixedly connected with driving racks (43) on the same side, and the two driving racks (43) are meshed with driving gears (44) rotatably connected to the inner top surface of the sewage tank (53).

4. A municipal rainwater drainage system according to claim 3, wherein: two guide rods (45) are fixedly connected to the inner wall of the sewage tank (53), guide rod grooves (28) are formed in the close vertical side faces of the two guide rods (45), a group of pulleys (46) are rotatably connected to the two opposite vertical side faces of the vertical rod (56), and the two groups of pulleys (46) are respectively connected to the two guide rod grooves (28) in a rolling mode along the vertical direction.

5. A municipal rainwater drainage system according to claim 4, wherein: the gate moving mechanism comprises a vertical telescopic rod (47) which is fixedly connected to one end of the upper portion of the vertical rod (56) exposed outside the sewage tank (53) and can change the length of the vertical telescopic rod, a pipe rod (48) which is fixedly connected to the bottom of the purified water pipe (51), a gate rod (31) which is fixedly connected to the part of the purified water pipe (52) exposed outside the purified water pipe (51), a rotating telescopic rod (49) with two ends respectively hinged to the pipe rod (48) and the gate rod (31), a pushing spring (32) which is sleeved on the rotating telescopic rod (49) and two ends respectively fixedly connected to the two ends of the rotating telescopic rod (49), a balancing weight (29) which is fixedly connected to the vertical rod (56), and the upper end of the vertical telescopic.

6. A municipal rainwater drainage system according to claim 5, wherein: the bottom of the water purifying pipe (51) is provided with a lower seepage hole (33) communicated to the inside of the water purifying pipe (51), and the lower part of the water purifying pipe (51) is provided with a geotextile (34) which is attached to the geotextile.

7. The municipal rainwater drainage system of claim 6, wherein: preliminary filtering device (3) including can dismantle grid lid (35) of connecting in the mouth opening part that catchments, fixed connection in the pipe (36) of permeating water of grid lid (35) bottom surface, fixed connection in the pipe (36) bottom of permeating water and be pervious to water board (37) of slope.

8. The municipal rainwater drainage system of claim 7, wherein: collector pipe (2) intercommunication has collecting pipe (38), and collecting pipe (38) are arranged in collector pipe (2) one end fixedly connected with and decide board (39), decide board groove (21) have been seted up to board (39) upper surface, tub (36) of permeating water the pipe that the minimum point department fixedly connected with in vertical side of pipe (36) is linked together moves pipe (22), move pipe (22) and keep away from tub (36) one end fixedly connected with of permeating water and can peg graft in picture peg (23) of deciding board groove (21), decide board (39) orientation permeate water and set up pipe groove (24) that communicate in deciding board groove (21) to tub (22) can get into in pipe groove (24).

9. The municipal rainwater drainage system of claim 8, wherein: the water collecting pipe (2) is communicated with a sharing pipe (25) which is inclined, one end of the sharing pipe (25) communicated with the water collecting pipe (2) is a low point, one end of the sharing pipe (25) far away from the water collecting pipe (2) is communicated with a water storage tank (26), the water storage tank (26) is communicated with a water pump (27), and a water outlet of the water pump (27) is communicated with a water purifying pipe (51).

10. A municipal rainwater drainage system according to claim 9, wherein: divide pipe box (4) bottom surface to be the slope and divide pipe box (4) bottom surface to be close to water purification pipe (51) one side and be the minimum, and sewer pipe (5) are slope and sewer pipe (5) low point one end and keep away from water purification pipe (51), and sewer pipe (5) communicate in branch pipe box (4) bottom surface low point one side department, and water purification pipe (51) communicate branch pipe box (4) one end is the slope direction of slope and water purification pipe (51) slope one end and the slope direction of branch pipe box (4) bottom surface unanimous mutually.