CN210975851U

CN210975851U - Foundation pit drainage system

Info

Publication number: CN210975851U
Application number: CN201921356600.6U
Authority: CN
Inventors: 杨峰; 陈凤; 李文鹏
Original assignee: Zhejiang Chemical Engineering Geological Survey Institute Co ltd
Current assignee: Zhejiang Chemical Engineering Geological Survey Institute Co ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-07-10
Anticipated expiration: 2029-08-20

Abstract

The utility model belongs to the technical field of drainage system technique and specifically relates to a foundation ditch drainage system is related to. The prior art has that a large amount of silt and impurity can block up the not enough of drain pump in the sump pit, this scheme includes the foundation ditch, a plurality of escape canals have been seted up to the foundation ditch bottom, the escape canal is connected with a plurality of sump pits of seting up in the foundation ditch bottom, be equipped with the drain pump that is used for the drainage in the sump pit, each entry that the escape canal got into the sump pit all is fixed with the frame, the width of frame is the same with the width in escape canal, frame bottom and escape canal bottom butt, the filter equipment who is used for filtering silt has been placed in the frame, filter equipment includes first filter mechanism, first filter mechanism includes the bottom plate, fix coarse filter net and the thin filter screen on the bottom plate, coarse filter net and. This scheme can filter the silt and the impurity in escape canal, and the condition that reduces the drain pump and blockked up takes place.

Description

Foundation pit drainage system

Technical Field

The utility model belongs to the technical field of drainage system technique and specifically relates to a foundation ditch drainage system is related to.

Background

During excavation of a foundation pit, when the foundation is lower than the ground water level, the ground water continuously infiltrates into the pit due to the cutting-off of the aquifer of the soil. During construction in rainy period, underground water can continuously flow into the pit. If drainage measures are not taken, water flowing into the foundation pit is drained in time or the underground water level is lowered, so that the construction conditions are deteriorated, and after the foundation soil is softened by water, side slope collapse is easily caused and the bearing capacity of the foundation is lowered, so that drainage needs to be carried out on the foundation pit, and the situations are reduced.

The existing Chinese patent with the publication number of CN203429651U discloses an ultra-large deep foundation pit drainage system for coastal geological zone areas, which comprises a foundation pit top, a slope surface and a foundation pit bottom drainage structure, wherein the foundation pit top drainage structure comprises a foundation pit top drainage ditch arranged at the top of the foundation pit, and the periphery of the foundation pit top drainage ditch is provided with a flood prevention wall; the slope drainage structure comprises a slope step drainage ditch and a plurality of slope drainage pipes arranged on the slope protection surface; the foundation pit bottom drainage structure comprises a plurality of blind ditch pipes and a plurality of basement drainage ditches which are arranged at the bottom of a foundation pit, and a plurality of inspection wells which are respectively communicated with a plurality of slope drainage pipes and the basement drainage ditches, wherein the blind ditch pipes are composed of a plurality of sections of connected cast iron pipes with the diameter of 110mm, the plurality of sections of cast iron pipes are connected by adopting socket joints, the cast iron pipes are provided with mesh holes with the diameter of 1050mm, the outer surfaces of the cast iron pipes are coated with non-woven geotextile, and four water collecting wells which are communicated with the basement drainage ditches are arranged at four corners at the. The utility model discloses a groundwater circulation is smooth, reduces the destroyed possibility of foundation ditch.

But silt and some impurity in the foundation ditch can follow the water that flows and get into the escape canal and finally arrange the sump pit in, and a large amount of silt and impurity can reduce the efficiency of drainage pump and block up the drain pump even in the sump pit, influence the normal drainage of sump pit, so design a foundation ditch drainage, can filter the silt and the impurity of escape canal, reduce the condition that the drain pump blockked up and take place.

Disclosure of Invention

The utility model aims at providing a foundation ditch drainage system can filter silt and impurity in the escape canal, reduces the condition that the drain pump is blockked up and takes place.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a foundation ditch drainage system, includes the foundation ditch, a plurality of escape canals have been seted up to the foundation ditch bottom, the escape canal is connected with a plurality of sump pits of seting up in the foundation ditch bottom, be equipped with the drain pump that is used for the drainage in the sump pit, each entry that the escape canal got into the sump pit all is fixed with the frame, the width of frame is the same with the width in escape canal, frame bottom and escape canal bottom butt, place the filter equipment who is used for filtering silt in the frame, filter equipment includes first filter mechanism, first filter mechanism includes the bottom plate, fixes the coarse filtration net that is used for filtering large granule impurity on the bottom plate and the thin filter screen that is used for filtering small granule impurity, coarse filtration net and thin filter screen set up along escape canal length direction interval.

By adopting the technical scheme, the frame is fixed in the drainage ditch, the width of the frame is the same as that of the drainage ditch, the bottom end of the frame is abutted against the bottom of the drainage ditch, and the filtering device placed in the frame can filter most of water entering the water collecting pit through the drainage ditch, so that sludge and impurities in the drainage ditch are filtered, and the situation that the drainage ditch is blocked is reduced; be fixed with coarse filtration net and thin filter screen on the bottom plate, can carry out secondary filter to the drainage, reduce the impurity that gets into the sump, compare with only setting up the one deck filter screen, two-layer filter screen can mutually support and alleviate the damage that the individual layer filter screen received, the working life of extension filter screen.

The utility model discloses further set up to: the filter device further comprises a second filter mechanism, the first filter mechanism and the second filter mechanism are identical in structure, the first filter mechanism and the second filter mechanism are sequentially arranged at intervals along the length direction of the drainage ditch and distributed at the level in a staggered manner, a driving device used for driving the first filter mechanism and the second filter mechanism to move along the vertical direction is arranged on the frame, and the first filter mechanism and the second filter mechanism are opposite in movement direction.

By adopting the technical scheme, the first filtering mechanism and the second filtering mechanism have the same structure and are sequentially arranged at intervals along the length direction of the drainage ditch, so that the first filtering mechanism and the second filtering mechanism are mutually standby; when the first filtering mechanism needs to be cleaned, the first filtering mechanism is taken out, and the second filtering mechanism can continue to filter the drained water; when the second filtering mechanism needs to be cleaned, the second filtering mechanism is taken out, and the first filtering mechanism can continue to filter the drained water; the first filtering mechanism and the second filtering mechanism are distributed in a staggered manner on the horizontal height, the driving device can simultaneously drive the first filtering mechanism and the second filtering mechanism to move in the vertical direction, the moving directions are opposite, and when the first filtering mechanism performs filtering work in the frame, the initial position of the second filtering mechanism is positioned at the top end of the frame, so that workers can conveniently clean the second filtering mechanism; the operation driving device drives the second filtering mechanism to be placed in the frame to work, and the first filtering mechanism is driven to the top end of the frame, so that workers can wash the first filtering mechanism conveniently, the filtering mechanism is placed in the frame all the time, the possibility that sludge enters the water collecting pit is reduced, and the situation that the drainage pump is blocked is reduced.

The utility model discloses further set up to: the inner wall of the frame is provided with a first sliding chute and a second sliding chute along the vertical direction, the first sliding chute is connected with a first lifting plate in a sliding manner, the second sliding chute is connected with a second lifting plate in a sliding manner, the first filtering mechanism is placed on the first lifting plate, the second filtering mechanism is placed on the second lifting plate, the driving device comprises an extension plate fixed at the top end of the frame, a first wire collecting disc and a second wire collecting disc which are rotatably connected on the extension plate, the first wire collecting disc and the second wire collecting disc are coaxially arranged and are positioned at one end of the extension plate far away from the frame, a first steel wire is wound on the first wire collecting disc, one end of the first steel wire is fixed on the first wire collecting disc, the other end of the first steel wire is fixed on the first lifting plate, a second steel wire is wound on the second wire collecting disc, one end of the second steel wire is fixed on the second wire collecting disc, the other end of the second steel wire is fixed on the second lifting plate, and the first steel wire and the second steel wire are the same in length and opposite in winding direction.

By adopting the technical scheme, the first filtering mechanism is placed on the first lifting plate, the second filtering mechanism is placed on the second lifting plate, the first lifting plate and the second lifting plate are respectively connected on the first sliding groove and the second sliding groove which are arranged on the inner wall of the frame in a sliding manner, the lengths of the first sliding groove and the second sliding groove are the same as the height of the frame, the first wire collecting disc and the second wire collecting disc share a rotating shaft, the rotating shaft is rotationally connected on the extension plate, the first steel wire and the second steel wire are the same in length and opposite in winding direction, when the first filtering mechanism carries out filtering work in the frame, the initial position of the second filtering mechanism is arranged at the top end of the frame, the first wire collecting disc and the second wire collecting disc are driven to simultaneously rotate in one direction by rotating the rotating shaft, the first wire collecting disc carries out winding of the first steel wire, the second wire collecting disc carries out unwinding of the second steel wire, the first lifting plate slides to the top end of the frame, sliding the second lifting plate to the bottom end of the frame, so that the first lifting plate and the second lifting plate can be driven to move in vertical opposite directions; the rotating shaft is rotated in the opposite direction, the first wire collecting disc conducts unreeling of the first steel wire, the second wire collecting disc conducts reeling of the second steel wire, the first lifting plate slides to the top end of the frame, the second lifting plate slides to the bottom end of the frame, and the functions that the first filtering mechanism and the second filtering mechanism are driven simultaneously and are mutually standby are achieved.

The utility model discloses further set up to: the first sliding groove and the second sliding groove are both T-shaped grooves.

Through adopting above-mentioned technical scheme, the setting up in T type groove reduces the possibility that upset appears when first lifter plate and second lifter plate slide in vertical direction, improves first, the gliding stability of second lifter plate.

The utility model discloses further set up to: the first sliding groove and the second sliding groove are both arranged on the inner wall of the frame on the backwater side.

Through adopting above-mentioned technical scheme, first spout and second spout are all seted up on the backwater side inner wall of frame, and the condition that reduces stone and foreign particles and get into in first, the second spout along with the rivers direction takes place, reduces the possibility that stone and foreign particles fill first, the second spout.

The utility model discloses further set up to: an extension plate is fixed on one side of the base plate on the coarse filter screen.

By adopting the technical scheme, when the impurities on the coarse filter screen are excessively accumulated and the filter device needs to be taken out of water, the extension plate can provide a bearing surface for the impurities attached to the coarse filter screen, so that the situation that the impurities fall into the drainage ditch again is reduced; the bottom plate can also provide a bearing surface for impurities attached to the fine filter screen, so that the situation that the impurities fall into the drainage ditch again is reduced.

The utility model discloses further set up to: the extension plate is equipped with the baffle that is used for collecting silt in the one end of keeping away from coarse filter screen, the both ends difference fixedly connected with curb plate of vertical drainage ditch length is followed to the bottom plate, curb plate and baffle butt, baffle, curb plate, thin filter screen, bottom plate and extension plate enclose into a space that is used for collecting silt.

Through adopting above-mentioned technical scheme, baffle, curb plate, fine filter screen, bottom plate and extension plate enclose synthetic space and can be used for collecting silt and some impurity, and the setting up of curb plate and baffle all improves the leakproofness of enclosing synthetic space, and the condition that reduces silt and impurity and drop from bottom plate and extension plate takes place, improves the efficiency of collecting impurity and silt, and better realization is to the collection of impurity and silt.

The utility model discloses further set up to: the baffle plate is rotatably connected with the extension plate, and the side plate is provided with a locking piece for locking the baffle plate at a vertical position.

Through adopting above-mentioned technical scheme, when pouring impurity and silt from bottom plate and extension plate, rotate the baffle and make the baffle break away from the shutoff to silt and impurity, make things convenient for pouring of silt and impurity, easy operation is convenient.

The utility model discloses further set up to: the bottom plate is fixed with the universal wheel that is used for removing, all offer the chamber of placing that is used for placing the universal wheel on first lifter plate and the second lifter plate.

By adopting the technical scheme, when impurities and sludge are required to be dumped or the filtering device is required to be cleaned, the universal wheels on the bottom plate facilitate workers to move the filtering device, and physical loss of the workers is reduced; because of there is the clearance between the setting messenger bottom plate and first, the second lifter plate of universal wheel, there is impurity and silt to pass the condition that gets into the sump pit from the clearance and appear, and the setting of placing the chamber makes the universal wheel can place completely in placing the chamber to make bottom plate and first, the second lifter plate laminate completely, reduce impurity and silt and pass the condition that gets into the sump pit from the clearance and appear.

To sum up, the utility model discloses a beneficial technological effect does:

1. the filter device placed in the frame can filter most of water entering the water collecting pit through the drainage ditch, so that sludge and impurities in the drainage ditch are filtered, and the situation that the drainage pump is blocked is reduced;

2. the first filtering mechanism and the second filtering mechanism have the same structure and are sequentially arranged at intervals along the length direction of the drainage ditch, so that the first filtering mechanism and the second filtering mechanism are mutually standby;

3. be fixed with coarse filtration net and thin filter screen on the bottom plate, can carry out secondary filter to the drainage, reduce the impurity that gets into the sump, compare with only setting up the one deck filter screen, two-layer filter screen can mutually support and alleviate the damage that the individual layer filter screen received, the working life of extension filter screen.

Drawings

FIG. 1 is a schematic view of the position of the present invention in a foundation pit drain;

FIG. 2 is a schematic view of the structure of the filter device;

FIG. 3 is a left side view of the filter apparatus;

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

fig. 5 is a top view of the filter device.

In the figure, 1, a foundation pit; 2. a drainage ditch; 3. a sump; 4. draining pump; 5. a frame; 6. a filtration device; 7. a first filter mechanism; 8. a second filter mechanism; 9. a base plate; 10. a coarse filter screen; 11. a fine filter screen; 12. an extension plate; 13. a baffle plate; 14. a side plate; 15. a locking member; 16. a drive device; 17. a first chute; 18. a first lifter plate; 19. a second chute; 20. a second lifter plate; 21. an extension plate; 22. a first take-up spool; 23. a second take-up spool; 24. a rotating shaft; 25. a first steel wire; 26. a second steel wire; 27. a universal wheel; 28. a placement chamber; 29. a handle.

Detailed Description

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

As shown in fig. 1, a foundation pit drainage system, including foundation pit 1, a plurality of escape canal 2 have been seted up to 1 bottom of foundation pit, and a plurality of sump pit 3 have still been seted up to 1 bottom of foundation pit, and escape canal 2 is connected with sump pit 3 to all flow the water of 2 collections in the sump pit 3 with the escape canal and keep in. A drain pump 4 is placed in the sump 3 for draining the water stored in the sump 3 out of the foundation pit 1. Each inlet of the drainage ditch 2 into the sump 3 is fixed with a frame 5.

As shown in fig. 1 and 2, the frame 5 has the same width as the drainage ditch 2, the bottom end of the frame 5 abuts against the bottom of the drainage ditch 2, the top end of the frame 5 is higher than the drainage ditch 2, and a filter device 6 for filtering sludge is placed in the frame 5, so that most of the water entering the water collection pit 3 through the drainage ditch 2 can be filtered.

As shown in fig. 2, the filtering device 6 includes a first filtering mechanism 7 and a second filtering mechanism 8, the first filtering mechanism 7 and the second filtering mechanism 8 have the same structure, and the first filtering mechanism 7 and the second filtering mechanism 8 are sequentially arranged at intervals along the length direction of the drainage ditch 2, so as to realize mutual backup.

As shown in fig. 2 and 4, the first filter mechanism 7 includes a bottom plate 9, a coarse filter screen 10 and a fine filter screen 11 are fixed on the upper end surface of the bottom plate 9, the coarse filter screen 10 and the fine filter screen 11 are arranged at intervals along the length direction of the drainage ditch 2, the coarse filter screen 10 is used for filtering large-particle impurities, and the fine filter screen 11 is used for filtering small-particle impurities.

Extension plate 12 is fixed with on one side of coarse filter screen 10 at bottom plate 9, and extension plate 12 can provide one and be stained with and accept face of attaching impurity on coarse filter screen 10, reduces the condition emergence that impurity falls into escape canal 2 again, and bottom plate 9 can provide one and be stained with and accept face of attaching impurity on fine filter screen 11 equally, reduces the condition emergence that impurity falls into escape canal 2 again.

Extension plate 12 rotates in the one end of keeping away from coarse filter screen 10 and is connected with baffle 13, and bottom plate 9 is along the both ends of perpendicular gutter 2 length all fixedly connected with curb plate 14, and two curb plates 14 all with baffle 13 butt, rotate on the curb plate 14 and be connected with locking piece 15, and locking piece 15 is used for locking baffle 13 at vertical position.

As shown in fig. 1 and 2, the frame 5 is provided with a driving device 16, and the driving device 16 is used for driving the first filtering mechanism 7 and the second filtering mechanism 8 to move simultaneously along the vertical direction and in opposite moving directions, so that the filtering mechanism is always arranged in the frame 5 for filtering, and the possibility of sludge entering the sump 3 is reduced.

As shown in fig. 2 and 4, two first sliding grooves 17 are formed in the inner wall of the frame 5, which is close to the coarse filter screen 10 in the first filter mechanism 7, along the length direction of the drainage ditch 2, and the length of the first sliding grooves 17 is the same as the height of the frame 5, so that the situation that stones and impurity particles enter the first sliding grooves 17 along the water flow direction can be reduced; the first sliding groove 17 is a T-shaped groove, the first lifting plate 18 is connected in the first sliding groove 17 in a sliding mode, the first filtering mechanism 7 is placed on the first lifting plate 18, so that the first lifting plate 18 can be driven to drive the first filtering mechanism 7 to move in the vertical direction, and the possibility of overturning of the first lifting plate 18 when sliding in the vertical direction is reduced due to the design of the T-shaped groove; frame 5 has seted up two second spouts 19 along vertical direction on being close to the inner wall of coarse filter screen 10 among the second filter mechanism 8 along 2 length direction in escape canal, and the length of second spout 19 also is the same with frame 5's height, and second spout 19 also is T type groove, and sliding connection has second lifter plate 20 in the second spout 19, and second filter mechanism 8 places on second lifter plate 20.

The driving device 16 comprises an extension plate 21 fixed at the top end of the frame 5, one end of the extension plate 21 far away from the frame 5 is rotatably connected with a first wire take-up disc 22 and a second wire take-up disc 23, the first wire take-up disc 22 and the second wire take-up disc 23 share a same rotating shaft 24, and a handle 29 is fixedly connected on the rotating shaft 24. A first steel wire 25 is wound on the first wire take-up disc 22, one end of the first steel wire 25 is fixed on the first wire take-up disc 22, and the other end of the first steel wire 25 is fixed on the first lifting plate 18; a second steel wire 26 is wound on the second wire take-up disc 23, one end of the second steel wire 26 is fixed on the second wire take-up disc 23, and the other end of the second steel wire 26 is fixed on the second lifting plate 20. The first steel wire 25 and the second steel wire 26 have the same length and opposite winding directions. The rotating shaft 24 is rotated through the handle 29 to drive the first wire winding disc 22 and the second wire winding disc 23 to rotate in one direction simultaneously, when the first wire winding disc 22 winds the first steel wire 25, the second wire winding disc 23 unwinds the second steel wire 26, the first steel wire 25 winds and drives the first lifting plate 18 to rise, the second steel wire 26 unwinds and drives the second lifting plate 20 to fall, and the first filtering mechanism 7 and the second filtering mechanism 8 are driven to run in the vertical direction in an opposite mode. The second wire 26 positions the second lifter plate 20 at the top end of the frame 5 when the first lifter plate 18 is positioned at the bottom end of the frame 5; the second wire 26 positions the second lifter plate 20 at the bottom end of the frame 5 when the first lifter plate 18 is positioned at the top end of the frame 5. The first filtering mechanism 7 and the second filtering mechanism 8 are driven simultaneously and mutually standby by driving the rotating shaft 24 to rotate.

As shown in fig. 2 and 4, four universal wheels 27 are rotatably arranged on the end surface of the bottom plate 9 far away from the fine filter screen 11, and the universal wheels 27 facilitate the movement of the filter device 6 by workers. The upper end surfaces of the first lifting plate 18 and the second lifting plate 20 are provided with a placing cavity 28, the placing cavity 28 is used for completely placing the universal wheel 27 in the placing cavity 28, so that the bottom plates 9 in the first filtering mechanism 7 and the second filtering mechanism 8 are completely attached to the first lifting plate 18 and the second lifting plate 20 respectively, and the situation that impurities and sludge pass through the gap and enter the water collecting pit 3 (shown in fig. 1) is reduced.

The working process is as follows:

initial position: when the first filtering mechanism 7 filters in the frame 5, the second filtering mechanism 8 is positioned at the top end of the frame 5 for standby;

when sludge and impurities in the first filtering mechanism 7 need to be treated, the operating handle 29 rotates the rotating shaft 24 clockwise to lift the first filtering mechanism 7 to the top of the frame 5 through the first lifting plate 18, the second filtering mechanism 8 is placed in the frame 5 through the second lifting plate 20 to filter the impurities, then the first filtering mechanism 7 is taken out of the frame 5, the first filtering mechanism 7 is pushed to a proper position, the locking piece 15 is rotated to rotate the baffle 13 to put down, the sludge and the impurities are poured out of the first filtering mechanism 7, then the baffle 13 is restored to a vertical position and locked through the locking piece 15, and the first filtering mechanism 7 is placed on the first lifting plate 18 again for standby;

when the sludge and impurities in the second filtering mechanism 8 need to be treated, the process is the same as that of the first filtering mechanism described above.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a foundation ditch drainage system, includes foundation ditch (1), a plurality of escape canals (2) have been seted up to foundation ditch (1) bottom, escape canal (2) are connected with a plurality of sump pit (3) of seting up in foundation ditch (1) bottom, be equipped with in sump pit (3) and be used for drainage pump (4), its characterized in that: each entry that escape canal (2) got into sump pit (3) all is fixed with frame (5), the width of frame (5) is the same with the width of escape canal (2), frame (5) bottom and escape canal (2) bottom butt, placed in frame (5) and be used for filtering filter equipment (6) of silt, filter equipment (6) are including first filter mechanism (7), first filter mechanism (7) include bottom plate (9), fix on bottom plate (9) and be used for filtering coarse granule impurity's coarse filtration net (10) and be used for filtering fine particle impurity's fine filtration net (11), coarse filtration net (10) and fine filtration net (11) are along escape canal (2) length direction interval setting.

2. A foundation pit drainage system according to claim 1, wherein: filter equipment (6) still includes second filter mechanism (8), first filter mechanism (7) and second filter mechanism (8) structure are the same, and first filter mechanism (7) and second filter mechanism (8) set up and distribute on the level at the interval in proper order along escape canal (2) length direction, be equipped with on frame (5) and be used for driving drive arrangement (16) that first filter mechanism (7) and second filter mechanism (8) moved along vertical direction simultaneously, the direction of motion of first filter mechanism (7) and second filter mechanism (8) is opposite.

3. A foundation pit drainage system according to claim 2, wherein: the inner wall of the frame (5) is provided with a first sliding groove (17) and a second sliding groove (19) along the vertical direction, the first sliding groove (17) is connected with a first lifting plate (18) in a sliding manner, the second sliding groove (19) is connected with a second lifting plate (20) in a sliding manner, the first filtering mechanism (7) is placed on the first lifting plate (18), the second filtering mechanism (8) is placed on the second lifting plate (20), the driving device (16) comprises an extension plate (21) fixed at the top end of the frame (5), a first wire collecting disc (22) and a second wire collecting disc (23) which are rotatably connected on the extension plate (21), the first wire collecting disc (22) and the second wire collecting disc (23) are coaxially arranged and are positioned at one end, far away from the frame (5), of the extension plate (21), a first steel wire (25) is wound on the first wire collecting disc (22), one end of the first steel wire (25) is fixed on the first wire collecting disc (22), the other end of first steel wire (25) is fixed on first lifter plate (18), the winding has second steel wire (26) on second receipts silk dish (23), the one end of second steel wire (26) is fixed on second receipts silk dish (23), the other end of second steel wire (26) is fixed on second lifter plate (20), first steel wire (25) is the same and winding opposite direction with second steel wire (26) length.

4. A foundation pit drainage system according to claim 3, wherein: the first sliding groove (17) and the second sliding groove (19) are both T-shaped grooves.

5. A foundation pit drainage system according to claim 4, wherein: the first sliding groove (17) and the second sliding groove (19) are both arranged on the inner wall of the frame (5) on the backwater side.

6. A foundation pit drainage system according to claim 1, wherein: an extension plate (12) is fixed on one side of the coarse filter screen (10) of the bottom plate (9).

7. A foundation pit drainage system according to claim 6, wherein: extension plate (12) are equipped with baffle (13) that are used for collecting silt keeping away from the one end of coarse filtration net (10), bottom plate (9) are along both ends fixedly connected with curb plate (14) respectively of vertical drainage ditch (2) length, curb plate (14) and baffle (13) butt, baffle (13), curb plate (14), fine filtration net (11), bottom plate (9) and extension plate (12) enclose synthetic space that is used for collecting silt.

8. A foundation pit drainage system according to claim 7, wherein: the baffle plate (13) is rotatably connected with the extension plate (12), and a locking piece (15) used for locking the baffle plate (13) at a vertical position is arranged on the side plate (14).

9. A foundation pit drainage system according to claim 3, wherein: the bottom plate (9) is fixedly provided with a universal wheel (27) used for moving, and the first lifting plate (18) and the second lifting plate (20) are provided with placing cavities (28) used for placing the universal wheel (27).