Foundation pit drainage circulating device

Abstract

The utility model discloses a kind of foundation pit drainage circulating devices, it is related to foundation pit drainage technical field, including mounting bracket, the top surface of mounting bracket is fixedly connected with four lifting lugs, the middle segment of mounting bracket is fixedly connected with support plate, the bottom surface of mounting bracket is provided with one storage mechanism at both ends, two storage mechanisms are provided with the filter mechanism for filtering sewage between, filter mechanism is fixedly connected with support plate, the top of one of storage mechanism is provided with control mechanism, the top of another storage mechanism is provided with pumping mechanism, first water pump cooperates pumping pipe and carries out extraction to the silt inside foundation pit to water tank inside by guide head, sewage is fixed by filter mechanism, water in water tank inside is deposited and filtered twice at this time, with higher cleanliness, can be used by worker daily, only need to place bucket to drain pipe bottom to receive water, solve the problem of waste water resource of existing foundation pit drainage device.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit drainage technology, and in particular to a foundation pit drainage circulation device. Background Technology

[0002] In the field of building construction, the drainage of foundation pits is a crucial step in ensuring project quality and construction safety. With the acceleration of urbanization, high-rise and super high-rise buildings and underground space projects are constantly emerging, leading to a continuous increase in the depth and scale of foundation pits, which places higher demands on drainage operations.

[0003] Currently, most existing foundation pit drainage devices achieve their effects using the following technologies; Open ditch and sump drainage technology is a relatively traditional and basic drainage method. During the construction of the foundation pit, a drainage ditch with a certain slope is excavated at the edge or inside of the pit, and water is pumped out. Wellpoint dewatering technology, based on different dewatering principles and applicable conditions, can be subdivided into various types such as light wellpoint, jet wellpoint, electroosmotic wellpoint, and tubular wellpoint. The water pump pipe is placed into the wellpoint to extract water. Blind drain drainage technology involves setting up blind drains at the bottom or slope of the foundation pit. The blind drains are filled with permeable materials such as crushed stone and gravel of different particle sizes to form a concealed drainage channel. A water-resistant curtain combined with drainage technology is used to block groundwater seepage into the foundation pit by setting up a water-resistant curtain around the perimeter of the pit, such as a diaphragm wall, high-pressure jet grouting pile, or cement-soil mixing pile. At the same time, drainage facilities (water pump pipelines) are installed inside the pit to drain any small amount of water accumulated within the curtain.

[0004] Currently, existing foundation pit drainage devices have been found to have at least the following technical problems in actual use; Existing drainage systems, in order to avoid affecting drainage efficiency and construction accuracy, mostly pump water directly out of the foundation pit through pipes and pumps. Due to the limitation of pipe length, the water needs to be discharged to the nearest location near the foundation pit. If a large amount of water is discharged, it may erode the land near the foundation pit and affect the foundation of the project. Furthermore, directly discharging groundwater from inside the foundation pit will cause a waste of water resources. In construction sites without water and electricity, the water inside the foundation pit also has high utilization value. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a foundation pit drainage and circulation device, which solves the problems of existing foundation pit drainage devices easily causing erosion of the land near the foundation pit and wasting water resources.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A foundation pit drainage and circulation device includes a mounting frame, which is welded from two metal plates with reinforcing ribs and ten hollow metal tubes. Four lifting rings are fixedly connected to the top surface of the mounting frame, and a support plate is fixedly connected to the middle section of the mounting frame. A storage mechanism is provided at both ends of the bottom surface of the mounting frame, one for sedimentation and the other for storage. A filter mechanism for filtering wastewater is provided between the two storage mechanisms and is fixedly connected to the support plate. A control mechanism is located at the top of one storage mechanism, and a pumping mechanism is located at the top of the other storage mechanism. The control mechanism includes a battery, a distribution box, and a PLC controller. Each storage mechanism includes a water tank with an observation window at one end. Two drain pipes are fixedly connected to the side of one water tank away from the filter mechanism, and the middle section of the two drain pipes... Both tanks are fixedly equipped with solenoid valves. Another tank is fixedly connected to a drain pipe on the side away from the observation window. A solenoid valve is fixedly installed in the middle section of the drain pipe. Both tanks are fixedly connected to the inner bottom surface of the mounting frame by a preset limit bolt. Bolts are installed at the bottom of the tanks. Holes are started at the bottom of the mounting frame. The bolts pass through the holes and are tightened with nuts. The filtration mechanism includes a second water pump, a third water pump, and a fourth water pump. Two sets of filters are installed between the second, third, and fourth water pumps. Each set of filters contains three filters. Both sets of filters are fixedly connected to the support plate. The two sets of filters are connected to the second, third, and fourth water pumps through a pipe assembly. The pipe assembly includes a first inlet pipe, a first outlet pipe, a second inlet pipe, and a second outlet pipe. The pumping mechanism includes a first water pump, a pumping pipe, a guide head, and a barrier net.

[0007] Preferably, the first water pump is fixedly connected to the top surface of the water tank. A radar level sensor is installed on the top surface of the water tank where the first water pump is installed to detect the height of the sediment. When the height reaches a preset value, the solenoid valve is automatically opened to discharge the sediment at the bottom through the drain pipe. The opening and closing of the radar level sensor is controlled by a PLC controller. The outlet of the first water pump passes through the top of the water tank and faces the inside of the water tank. The outlet of the first water pump is fixedly connected to the pumping pipe.

[0008] Preferably, the end of the pumping pipe furthest from the first pump is fixedly connected to the guide head, and the end of the guide head furthest from the pumping pipe is fixedly connected to the barrier net.

[0009] Preferably, a support shaft is fixedly connected to the side of the water tank where the first water pump is installed, away from the observation window. The support shaft is rotatably connected to a winding wheel. Six handles are provided on the side of the winding wheel away from the water tank. A braking assembly is provided between the winding wheel and the support shaft. The braking assembly includes a threaded sleeve installed on the winding wheel, a bolt threadedly connected to the threaded sleeve, and a circular groove on the surface of the support shaft. The bolt is inserted into the circular groove to limit rotation.

[0010] Preferably, the battery, distribution box, and PLC controller are all fixedly connected to the top surface of the water tank. The battery is provided with a waterproof shell, and a cooling fan is provided on one side of the shell. The shell is also provided with a charging interface. The distribution box includes a signal input unit, an execution output unit (relay module, analog output module), and an electrical control unit. The distribution box is electrically connected to each electrical structure through waterproof flexible circuits.

[0011] Preferably: the second water pump is fixedly connected to the top surface of the water tank where the first water pump is installed; the inlet of the second water pump penetrates through the top of the water tank; a drain pipe is fixedly connected to the inlet of the second water pump, extending into the middle of the water tank; the outlet of the second water pump is fixedly connected to the first inlet pipe; the end of the first inlet pipe away from the second water pump is fixedly connected to the inlet of the first filter group; the outlet of the first filter group is fixedly connected to the first outlet pipe; the end of the first outlet pipe away from the filter is fixedly connected to the inlet of the third water pump; the outlet of the third water pump is fixedly connected to the second inlet pipe; the end of the second inlet pipe away from the third water pump is fixedly connected to the inlet of the second filter group; the outlet of the second filter group is fixedly connected to the second outlet pipe; the end of the second outlet pipe away from the filter is fixedly connected to the inlet of the fourth water pump; and the outlet of the fourth water pump penetrates through the top of another water tank and faces inwards.

[0012] Preferred: The filter includes a filter cartridge, the top of which is connected to a cover plate via a bolt assembly flange, an inlet is provided on the surface of the cover plate, an outlet is provided at the bottom of the filter cartridge, a support ring is fixedly connected to the inner wall of the filter cartridge, a composite filter element is provided on the inner side of the filter cartridge, the composite filter element is made of activated carbon and filter cotton, the composite filter element is in contact with the support ring, a sealing ring is provided between the composite filter element and the support ring, and an abutment is provided at the bottom of the cover plate to press against the top surface of the composite filter element.

[0013] Compared with the prior art, the present invention has the following beneficial effects: First, the first water pump, in conjunction with the pumping pipe, draws the muddy water from inside the foundation pit into a water tank via a guide head. The second water pump then pumps the water from the tank to the first set of filters. After one filtration, the water is directed to the second set of filters via the first outlet pipe, the third water pump, and the second inlet pipe. After filtration by the second set of filters, the water is then directed to another water tank for storage via the second outlet pipe and the fourth water pump. At this point, the water in the tank has undergone sedimentation and two filtrations, resulting in a high level of cleanliness, suitable for daily use by workers. Only a bucket needs to be placed at the bottom of the drain pipe to collect the water, thus solving the problem of wasted water resources in existing foundation pit drainage devices.

[0014] Second, this application allows water inside the foundation pit to be stored in a water tank, and then transported away from the foundation pit by a flatbed truck to a designated location where it is converted into purified water and unloaded. This avoids erosion of the soil near the foundation pit and solves the problem that existing foundation pit drainage devices are prone to eroding the soil near the foundation pit, thus affecting the quality of the project. Attached Figure Description

[0015] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a structural diagram of the storage and filtration mechanisms of this utility model; Figure 3 This is a side view of the filter mechanism of this utility model; Figure 4 This is a half-sectional view of the filter element of this utility model.

[0017] Legend: 1. Mounting frame; 2. Water tank; 3. First water pump; 4. Rewind reel; 5. Battery; 6. Filtration mechanism; 7. Filter; 101. Lifting ring; 102. Support plate; 201. Drain pipe; 202. Solenoid valve; 203. Observation window; 301. Pumping pipe; 302. Guide head; 303. Barrier net; 401. Handle; 501. Distribution box; 502. PLC controller; 601. Second water pump; 602. First inlet pipe; 603. First outlet pipe; 604. Third water pump; 605. Second inlet pipe; 606. Second outlet pipe; 607. Fourth water pump; 701. Filter cartridge; 702. Cover plate; 703. Support ring; 704. Composite filter element. Detailed Implementation

[0018] This application provides a foundation pit drainage and circulation device, which effectively solves the problems of existing foundation pit drainage devices causing erosion of the land near the foundation pit and wasting water resources. Example

[0019] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the technical solution in this application embodiment effectively solves the technical problems of existing foundation pit drainage devices easily causing erosion of the soil near the foundation pit and wasting water resources. The overall idea is as follows: To address the problems existing in the prior art, this utility model provides a foundation pit drainage and circulation device, including a mounting frame 1. The mounting frame 1 is welded from two metal plates with reinforcing ribs and ten hollow metal pipes. Four lifting rings 101 are fixedly connected to the top surface of the mounting frame 1, and a support plate 102 is fixedly connected to the middle section of the mounting frame 1. A storage mechanism is provided at both ends of the bottom surface of the mounting frame 1, one for sedimentation and the other for storage. A filter mechanism 6 for filtering sewage is provided between the two storage mechanisms. The filter mechanism 6 is fixedly connected to the support plate 102. A control mechanism is provided at the top of one of the storage mechanisms, and a pumping mechanism is provided at the top of the other storage mechanism. The control mechanism includes a battery 5, a distribution box 501, and a PLC controller 502. The storage mechanism includes a water tank 2. An observation window 203 is provided at one end of the water tank 2. Two drain pipes 201 are fixedly connected to the side of one of the water tanks 2 away from the filter mechanism 6. Solenoid valves 2 are fixedly installed in the middle section of each of the two drain pipes 201. 02. A drain pipe 201 is fixedly connected to the side of another water tank 2 away from the observation window 203. A solenoid valve 202 is fixedly installed in the middle section of the drain pipe 201. Both water tanks 2 are fixedly connected to the inner bottom surface of the mounting bracket 1 by a preset limit bolt. Bolts are set at the bottom of the water tanks 2. Holes are started at the bottom of the mounting bracket 1, and the bolts pass through the holes and are tightened with nuts. The filter mechanism 6 includes a second water pump 601, a third water pump 604, and a fourth water pump 607. The second water pump 601, the third water pump 604, and the fourth water pump 607... Two sets of filters 7 are installed between the water pumps 607, with three filters in each set. Both sets of filters 7 are fixedly connected to the support plate 102. The two sets of filters 7 are connected to the second water pump 601, the third water pump 604 and the fourth water pump 607 through a pipe assembly. The pipe assembly includes a first inlet pipe 602, a first outlet pipe 603, a second inlet pipe 605 and a second outlet pipe 606. The pumping mechanism includes a first water pump 3, a pumping pipe 301, a guide head 302 and a barrier net 303.

[0020] The first water pump 3 is fixedly connected to the top surface of the water tank 2. A radar level sensor is installed on the top surface of the water tank 2 where the first water pump 3 is installed to detect the height of the sediment. When the height reaches the preset value, the solenoid valve 202 is automatically opened to discharge the sediment at the bottom through the drain pipe 201. The opening and closing of the radar level sensor is controlled by the PLC controller 502. The outlet of the first water pump 3 passes through the top of the water tank 2 and faces the inside of the water tank 2. The outlet of the first water pump 3 is fixedly connected to the pumping pipe 301.

[0021] The end of the pumping pipe 301 away from the first water pump 3 is fixedly connected to the guide head 302, and the end of the guide head 302 away from the pumping pipe 301 is fixedly connected to the barrier net 303.

[0022] A support shaft is fixedly connected to the side of the water tank 2 where the first water pump 3 is installed, away from the observation window 203. The support shaft is rotatably connected to a winding wheel 4. Six handles 401 are provided on the side of the winding wheel 4 away from the water tank 2. A braking assembly is provided between the winding wheel 4 and the support shaft. The braking assembly includes a threaded sleeve installed on the winding wheel 4, a bolt threadedly connected to the threaded sleeve, and a circular groove on the surface of the support shaft. The bolt is inserted into the circular groove to limit rotation.

[0023] The battery 5, the distribution box 501, and the PLC controller 502 are all fixedly connected to the top surface of the water tank 2. The battery 5 is provided with a waterproof shell, and a cooling fan is provided on one side of the shell. The shell is also provided with a charging interface. The distribution box 501 includes a signal input unit, an execution output unit (relay module, analog output module), and an electrical control unit. The distribution box 501 is electrically connected to each electrical structure through waterproof flexible circuits.

[0024] The second water pump 601 is fixedly connected to the top surface of the water tank 2 where the first water pump 3 is installed. The inlet of the second water pump 601 penetrates the top of the water tank 2. A drain pipe is fixedly connected to the inlet of the second water pump 601, extending into the middle of the water tank 2. The outlet of the second water pump 601 is fixedly connected to the first inlet pipe 602. The end of the first inlet pipe 602 away from the second water pump 601 is fixedly connected to the inlet of the first set of filters 7. The outlet of the first set of filters 7 is fixedly connected to the first outlet pipe 603. The end of the third water pump 604 away from the filter 7 is fixedly connected to the inlet of the third water pump 604. The outlet of the third water pump 604 is fixedly connected to the second inlet pipe 605. The end of the second inlet pipe 605 away from the third water pump 604 is fixedly connected to the inlet of the second set of filters 7. The outlet of the second set of filters 7 is fixedly connected to the second outlet pipe 606. The end of the second outlet pipe 606 away from the filter 7 is fixedly connected to the inlet of the fourth water pump 607. The outlet of the fourth water pump 607 passes through the top of another water tank 2 and faces inward.

[0025] The filter 7 includes a filter cartridge 701. The top of the filter cartridge 701 is connected to a cover plate 702 via a bolt assembly flange. An inlet is provided on the surface of the cover plate 702, and an outlet is provided at the bottom of the filter cartridge 701. A support ring 703 is fixedly connected to the inner wall of the filter cartridge 701. A composite filter element 704 is provided inside the filter cartridge 701. The composite filter element 704 is made of activated carbon and filter cotton. The composite filter element 704 is in contact with the support ring 703. A sealing ring is provided between the composite filter element 704 and the support ring 703. An abutment is provided at the bottom of the cover plate 702 and is pressed against the top surface of the composite filter element 704.

[0026] Mounting bracket 1: Made of welded metal sheet and hollow metal tube, used to support and fix other components. The top surface has a lifting ring 101 for hoisting, and the middle section has a support plate 102 to fix the filter mechanism 6.

[0027] Water tank 2: The core of the storage mechanism, which is divided into two uses: sedimentation and storage. The bottom is fixed to the mounting bracket 1 by bolts. There is an observation window 203 at one end, and a drain pipe 201 and a solenoid valve 202 on the side.

[0028] First water pump 3: Part of the water pumping mechanism, fixed on the top surface of water tank 2, and pumps mud and water from the foundation pit through water pumping pipe 301.

[0029] Winding roller 4: Rotatably connected to water tank 2 via support shaft, used to wind up water pumping pipe 301, handle 401 can drive it to rotate, and braking component can limit its rotation.

[0030] Battery 5: Part of the control mechanism, it provides power to the system and has a waterproof casing, cooling fan and charging interface on the outside.

[0031] Filtration mechanism 6: Composed of a second water pump 601, a third water pump 604, a fourth water pump 607, and two sets of filters 7, used for filtering sewage.

[0032] Filter 7: Includes filter cartridge 701, cover plate 702, support ring 703 and composite filter element 704, which filters sewage twice to improve cleanliness.

[0033] Lifting ring 101: Located on the top surface of mounting frame 1, used for lifting equipment.

[0034] Support plate 102: Fixed in the middle section of mounting frame 1, supporting filter mechanism 6.

[0035] Drain pipe 201: Connected to water tank 2, used to drain sediment or clean water, with a solenoid valve 202 in the middle section for control.

[0036] Solenoid valve 202: controls the opening and closing of drain pipe 201, and is controlled by PLC controller 502.

[0037] Observation window 203: Located at one end of water tank 2, used to observe the internal condition of water tank 2.

[0038] Pumping pipe 301: Connects the first water pump 3 and the guide head 302, and is used to pump out mud and water.

[0039] Guide head 302: Located at the end of the water pumping pipe 301, it guides the direction of water pumping.

[0040] Barrier net 303: Located at the end of the guide head 302, it blocks debris from entering the pumping pipe 301.

[0041] Handle 401: Located on the side of the take-up reel 4, used for manually rotating the take-up reel 4.

[0042] Distribution box 501: Part of the control mechanism, including signal input unit, execution output unit and electrical control unit, which are electrically connected to various electrical structures through waterproof flexible circuits.

[0043] PLC controller 502: The core of the control mechanism, controlling the operation of equipment such as radar level sensor and solenoid valve 202.

[0044] Second water pump 601: Part of the filter mechanism 6, pumps water from the sedimentation tank 2 to the first filter 7.

[0045] First inlet pipe 602: connects the second water pump 601 and the first set of filters 7 to transport sewage.

[0046] First outlet pipe 603: connects the first set of filters 7 and the third water pump 604 to deliver water after one filtration.

[0047] The third water pump 604 is part of the filtration mechanism 6, which pumps the water after primary filtration to the second set of filters 7.

[0048] Second inlet pipe 605: Connects to the third water pump 604 and the second set of filters 7, and delivers water after primary filtration.

[0049] Second outlet pipe 606: Connects the second set of filters 7 and the fourth water pump 607 to deliver water after secondary filtration.

[0050] Fourth water pump 607: Part of the filter mechanism 6, which pumps the water after secondary filtration to the storage tank 2.

[0051] Filter cartridge 701: The main body of filter 7, with composite filter element 704 installed inside.

[0052] Cover plate 702: It is connected to the top of filter cartridge 701 by a bolt assembly flange and has a water inlet on its surface.

[0053] Support ring 703: Fixed to the inner wall of filter cartridge 701, supporting composite filter element 704.

[0054] Composite filter element 704: Made of activated carbon and filter cotton, it filters sewage. There is a sealing ring between it and the support ring 703. The top is pressed and connected to the cover plate 702.

[0055] Working principle: This application can be transported by a flatbed truck, simply by being secured to the vehicle with nylon straps. Lifting ring 101 is used for hoisting. The water pipe 301 is wound up by a winding wheel 4. The water pipe 301 can be released by rotating the winding wheel 4 using the handle 401. The first water pump 3, in conjunction with the water pipe 301, pumps mud and water from the pit through the guide head 302. The barrier net 303 blocks debris. The water discharged into the water tank 2 will settle for ten minutes. After ten minutes, the PLC controller 502 detects the water level and sediment height using a radar level sensor. When the preset value is reached, the solenoid valve 202 automatically opens. A certain volume of sediment is discharged (which can be collected by placing a bucket under the drain pipe 201). Then, the water inside the water tank 2 is pumped to the first set of filters 7 by the second water pump 601. After one filtration, the water is directed to the second set of filters 7 through the first outlet pipe 603, the third water pump 604, and the second inlet pipe 605. After filtration by the second set of filters 7, the water is directed to another water tank 2 for storage through the second outlet pipe 606 and the fourth water pump 607. At this time, the water inside the water tank 2 has a high degree of cleanliness after sedimentation and two filtrations, and can be used by workers for daily use. It is only necessary to place a bucket at the bottom of the drain pipe 201 to collect the water.

[0056] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A foundation pit drainage and circulation device, characterized in that, The system includes a mounting frame (1), with four lifting rings (101) fixedly connected to the top surface of the mounting frame (1), a support plate (102) fixedly connected to the middle section of the mounting frame (1), and a storage mechanism at each end of the bottom surface of the mounting frame (1). A filter mechanism (6) for filtering sewage is provided between the two storage mechanisms. The filter mechanism (6) is fixedly connected to the support plate (102). A control mechanism is provided at the top of one storage mechanism, and a pumping mechanism is provided at the top of the other storage mechanism. The control mechanism includes a storage battery (5), a distribution box (501), and a PLC controller (502). The storage mechanism includes a water tank (2), one end of which is provided with an observation window (203). Two drain pipes (201) are fixedly connected to the side of one of the water tanks (2) away from the filter mechanism (6). Solenoid valves (202) are fixedly installed in the middle section of each of the two drain pipes (201). A drain pipe (201) is fixedly connected to the side of the other water tank (2) away from the observation window (203). Solenoid valves (202) are fixedly installed in the middle section of the drain pipe (201). The filtration mechanism (6) includes a second water pump (601), a third water pump (604), and a fourth water pump (607). Two sets of filters (7) are provided between the second water pump (601), the third water pump (604), and the fourth water pump (607). Each set of filters (7) has three filters. Both sets of filters (7) are fixedly connected to the support plate (102). The two sets of filters (7) are connected to the second water pump (601), the third water pump (604), and the fourth water pump (607) through a pipe assembly. The pipe assembly includes a first inlet pipe (602), a first outlet pipe (603), a second inlet pipe (605), and a second outlet pipe (606). The pumping mechanism includes a first water pump (3), a pumping pipe (301), a guide head (302), and a barrier net (303).

2. The foundation pit drainage and circulation device as described in claim 1, characterized in that: The first water pump (3) is fixedly connected to the top surface of the water tank (2). The outlet of the first water pump (3) passes through the top of the water tank (2) and faces the inside of the water tank (2). The outlet of the first water pump (3) is fixedly connected to the water pumping pipe (301).

3. The foundation pit drainage and circulation device as described in claim 2, characterized in that: The end of the pumping pipe (301) away from the first water pump (3) is fixedly connected to the guide head (302), and the end of the guide head (302) away from the pumping pipe (301) is fixedly connected to the barrier net (303).

4. A foundation pit drainage and circulation device as described in claim 3, characterized in that: The water tank (2) equipped with the first water pump (3) has a support shaft fixedly connected to the side away from the observation window (203). The support shaft is rotatably connected to a winding wheel (4). The winding wheel (4) has six handles (401) on the side away from the water tank (2).

5. A foundation pit drainage and circulation device as described in claim 4, characterized in that: The battery (5), the distribution box (501) and the PLC controller (502) are all fixedly connected to the top surface of the water tank (2).

6. A foundation pit drainage and circulation device as described in claim 5, characterized in that: The second water pump (601) is fixedly connected to the top surface of the water tank (2). The outlet of the second water pump (601) is fixedly connected to the first inlet pipe (602). The end of the first inlet pipe (602) away from the second water pump (601) is fixedly connected to the inlet of the first set of filters (7). The outlet of the first set of filters (7) is fixedly connected to the first outlet pipe (603). The end of the first outlet pipe (603) away from the filter (7) is connected to the third water pump. The inlet of (604) is fixedly connected, the outlet of the third water pump (604) is fixedly connected to the second inlet pipe (605), the end of the second inlet pipe (605) away from the third water pump (604) is fixedly connected to the inlet of the second set of filters (7), the outlet of the second set of filters (7) is fixedly connected to the second outlet pipe (606), and the end of the second outlet pipe (606) away from the filter (7) is fixedly connected to the inlet of the fourth water pump (607).

7. A foundation pit drainage and circulation device as described in claim 6, characterized in that: The filter (7) includes a filter cylinder (701), a cover plate (702) is connected to the top flange of the filter cylinder (701), an inlet is opened on the surface of the cover plate (702), an outlet is opened at the bottom of the filter cylinder (701), a support ring (703) is fixedly connected to the inner wall of the filter cylinder (701), and a composite filter element (704) is provided on the inner side of the filter cylinder (701).

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