Foundation pit dewatering device and construction method

Abstract

The present application relates to a foundation pit dewatering device and a construction method, and relates to the field of building construction technology. A foundation pit dewatering device includes a cylinder, a water suction component, and an extrusion component: the water suction component is arranged in the cylinder, and includes water-absorbing cotton and a water-absorbing pipe. The water-absorbing cotton is placed on the bottom side of the cylinder and connected to the cylinder. A through hole is provided on the water-absorbing cotton, and one end of the water-absorbing pipe extends into the through hole. The other end of the water-absorbing pipe is connected to a water-pumping member; the extrusion component includes an extrusion plate, a movable disk, and a driving rod. The center of the extrusion plate is provided with an avoidance hole for the water-absorbing pipe to pass through, and is slidably connected to the cylinder. The movable disk is rotatably connected to the cylinder; one end of the driving rod is rotatably connected to the edge of the movable disk, and the other end of the driving rod is rotatably connected to the extrusion plate. One side of the movable disk is connected to a driving member for driving the movable disk to rotate, driving the extrusion plate to slide along the length direction of the cylinder, and squeezing the water-absorbing cotton. The present application can prevent mud and sand from entering the water-absorbing pipe and ensure the normal operation of the device.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a foundation pit dewatering device and a construction method. Background Art

[0002] Foundation pit dewatering refers to the dewatering work done when the groundwater level is higher than the excavation bottom surface during foundation pit excavation, and the groundwater will continue to seep into the pit to ensure that the foundation pit can be constructed under dry conditions, to prevent slope instability, foundation sand flow, pit bottom uplift, pit bottom pipe burst and reduced foundation bearing capacity.

[0003] When dewatering the foundation pit, multiple seepage wells are usually opened around the foundation pit. The depth of the seepage well is greater than the foundation pit, so that the seepage water enters the seepage well first. A water pump and a suction pipe are set at the seepage well. One end of the suction pipe is connected to the water pump, and the other end of the suction pipe is located in the seepage well. When the water pump is started, the water pump will pump out the water in the seepage well through the suction pipe, thereby preventing the seepage water from entering the foundation pit and reducing the seepage water in the foundation pit.

[0004] However, the seepage water entering the seepage well often carries a lot of sediment. When the water pump extracts the seepage water, the sediment will enter the pumping pipe and block the pumping pipe and the water pump, affecting the normal operation of the seepage device. Summary of the Invention

[0005] The purpose of this application is to provide a foundation pit dewatering device and a construction method that can effectively treat seepage and prevent the device from being blocked.

[0006] In the first aspect, the present application provides a foundation pit dewatering device that adopts the following technical solutions:

[0007] A foundation pit dewatering device and construction method, comprising:

[0008] Cylinder;

[0009] A water suction assembly is provided in the cylinder body and includes a water-absorbing cotton and a water-absorbing pipe. The water-absorbing cotton is placed on the bottom side of the cylinder body and is connected to the cylinder body. A through hole is opened on the water-absorbing cotton. One end of the water-absorbing pipe extends into the through hole. The other end of the water-absorbing pipe is connected to a water pumping member.

[0010] The extrusion assembly includes an extrusion plate, a movable disk and a driving rod. The center of the extrusion plate is provided with an avoidance hole for the water suction pipe to pass through and is slidably connected to the cylinder. The movable disk is rotatably connected to the cylinder.

[0011] One end of the driving rod is rotatably connected to the edge of the movable disk, and the other end of the driving rod is rotatably connected to the extrusion plate. A driving member is connected to one side of the movable disk for driving the movable disk to rotate, thereby driving the extrusion plate to slide along the length direction of the cylinder and squeeze the absorbent cotton.

[0012] By adopting the above technical solution, the precipitation device is installed in the seepage well, and the absorbent cotton can absorb the seepage water, while the mud and sand carried by the seepage water are intercepted by the absorbent cotton. When the driving part drives the movable disk to rotate, the driving rod will drive the extrusion plate to reciprocate along the length direction of the cylinder itself, thereby squeezing the absorbent cotton. The gap between the squeezed absorbent cotton and the water suction pipe is matched, and the squeezed water is extracted from the water suction pipe, thereby preventing mud and sand from entering the water suction pipe and clogging the water suction pipe.

[0013] Optionally, a filter plate is provided on the bottom side of the absorbent cotton, the filter plate is detachably connected to the cylinder and is provided with a plurality of sieve holes.

[0014] By adopting the above technical solution and setting up a filter plate, the sediment carried by the seepage water can be further intercepted.

[0015] Optionally, the water suction pipe includes a first connecting pipe and a second connecting pipe, the second connecting pipe is inserted into the first connecting pipe and rotatably connected to the first connecting pipe; the other end of the second connecting pipe is threadedly connected to a driving sleeve, the driving sleeve is sleeved on the second connecting pipe, and a connecting rod is provided between the driving sleeve and the extrusion plate, one end of the connecting rod is connected to the driving sleeve, and the other end of the connecting rod is connected to the extrusion plate;

[0016] When the second connecting tube rotates, the driving sleeve climbs along the length direction of the second connecting tube, and a sliding groove is opened on the cylinder along its length direction, and the top wall of the sliding groove can abut against the extrusion plate;

[0017] A plurality of limit blocks are arranged around the circumference of the extrusion plate, and a limit groove corresponding to the plurality of limit blocks is provided on the side wall of the slide groove. The limit groove is provided along the length direction of the cylinder, and the limit block is slidably connected in the limit groove.

[0018] By adopting the above technical solution, when the second connecting pipe rotates, since the limiting block is limited by the limiting groove, the driving sleeve will move along the length direction of the second connecting pipe toward the top plate, and then drive the extrusion plate to slide until it abuts against the bottom wall of the slide groove. At this time, if the driving sleeve continues to slide, it will drive the entire cylinder to climb along the second connecting pipe, thereby facilitating the recovery of the precipitation device.

[0019] Optionally, there are multiple connecting rods, and the multiple connecting rods are arranged around the driving sleeve.

[0020] By adopting the above technical solution, multiple connecting rods drive the extrusion plate to move up. After the extrusion plate abuts against the top wall of the slide groove, the driving sleeve drives the extrusion plate and the cylinder to climb along the second connecting rod. By setting multiple connecting rods, the stability of the extrusion plate and the cylinder climbing is improved.

[0021] Optionally, it further includes a cover plate arranged on the seepage well, wherein the cover plate is provided with a fixing sleeve, the fixing sleeve is arranged on the second connecting pipe and is detachably connected to the cover plate.

[0022] By adopting the above technical solution, the setting of the cover plate can seal the seepage well, thereby preventing rainwater from flowing into the seepage well during rainy weather, causing damage to the equipment and increasing the workload of the equipment.

[0023] Optionally, the cylinder includes a cylinder body and a top plate, the top plate is detachably connected to the cylinder body and is provided with a through hole for the water suction pipe to pass through.

[0024] By adopting the above technical solution, the top plate is disassembled to facilitate the installation of the extrusion component and the replacement of the absorbent cotton.

[0025] Optionally, an auxiliary climbing assembly is also included, which includes a walking wheel and an auxiliary rod. An insertion hole is opened on the peripheral side wall of the top plate, one end of the auxiliary rod is inserted into the insertion hole, and the other end of the auxiliary rod is connected to the walking wheel.

[0026] By adopting the above technical solution, when the dewatering device is installed in the seepage well or when the dewatering device is taken out from the seepage well, the walking wheels can provide guidance for the movement of the cylinder, making it more convenient to disassemble and assemble the dewatering device.

[0027] Optionally, an elastic element is further provided in the insertion hole, one end of the elastic element abuts against the bottom wall of the insertion hole, and the other end of the elastic element abuts against the auxiliary rod.

[0028] By adopting the above technical solution, the elastic element can shrink according to the actual size of the seepage well, thereby adjusting the length of the auxiliary rod extending out of the insertion hole, and the versatility is further improved.

[0029] In a second aspect, the present application provides a construction method according to the above-mentioned foundation pit dewatering device, comprising the following steps:

[0030] S1. Open multiple seepage wells around the foundation pit and install multiple foundation pit dewatering devices in the seepage wells one by one, so that the absorbent cotton fits the bottom wall of the seepage well to absorb the seepage water;

[0031] S2, rotating the movable disk to drive the extrusion plate to reciprocate along the length direction of the cylinder, squeezing the absorbent cotton, causing water to seep out of the absorbent cotton, and forming a gap between the squeezed absorbent cotton and the water absorption pipe;

[0032] S3. During the squeezing process, the water extraction component is opened to extract the seeping water, and the extracted water is collected and transferred.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. Install the precipitation device in the seepage well. The absorbent cotton can absorb the seepage water, and the mud and sand carried by the seepage water will be intercepted by the absorbent cotton. When the driving part drives the movable disk to rotate, the driving rod will drive the extrusion plate to reciprocate along the length direction of the cylinder itself, thereby squeezing the absorbent cotton. The gap between the squeezed absorbent cotton and the water suction pipe is matched, and the squeezed water is extracted from the water suction pipe, thereby preventing mud and sand from entering the water suction pipe and clogging the water suction pipe.

[0035] 2. When the second connecting tube rotates, since the limiting block is limited by the limiting groove, the driving sleeve will move along the length direction of the second connecting tube toward the top plate, thereby driving the extrusion plate to slide until it abuts against the bottom wall of the slide groove. At this time, if the driving sleeve continues to slide, it will drive the entire cylinder to climb along the second connecting tube, thereby facilitating the recovery of the precipitation device.

[0036] 3. When installing the dewatering device in the seepage well or removing the dewatering device from the seepage well, the walking wheel can provide guidance for the movement of the cylinder, making it more convenient to disassemble and assemble the dewatering device. The elastic element can shrink according to the actual size of the seepage well, thereby adjusting the length of the auxiliary rod extending out of the insertion hole, and the versatility is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the cross-sectional structure of the foundation pit dewatering device in this application installed in the seepage well;

[0038] Figure 2 It is a schematic cross-sectional view of the foundation pit dewatering device in this application;

[0039] Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A;

[0040] Figure 4 This is a schematic diagram of the cross-sectional structure of the foundation pit dewatering device in this application after the cylinder is removed;

[0041] Figure 5 is a schematic cross-sectional view of the auxiliary climbing assembly and the top plate in this application;

[0042] Figure 6 It is a schematic diagram of the cross-sectional structure when the foundation pit dewatering device is taken out from the seepage well in this application.

[0043] In the figure, 1. cylinder; 11. slide groove; 111. limit groove; 12. cylinder body; 13. top plate; 131. through hole; 132. insertion hole; 2. water suction assembly; 21. absorbent cotton; 211. through hole; 22. water suction pipe; 221. first connecting pipe; 222. second connecting pipe; 23. drive sleeve; 24. connecting rod; 241. first connecting rod; 242. second connecting rod; 3. extrusion assembly; 31. extrusion plate; 32. movable disk; 33. drive rod; 34. mounting plate; 4. water pumping part; 5. drive part; 6. filter plate; 7. cover plate; 8. auxiliary climbing assembly; 81. walking wheel; 82. auxiliary rod; 83. elastic element; 9. fixing sleeve; 10. seepage well; 20. foundation pit. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0045] A foundation pit dewatering device and construction method, referring to Figure 1 and Figure 2 , including a cylinder 1, a water suction component 2 and an extrusion component 3, the water suction component 2 and the extrusion component 3 are both placed in the cylinder 1, combined Figure 3 The water suction component 2 includes absorbent cotton 21 and a water suction pipe 22. The absorbent cotton 21 is placed on the bottom side of the cylinder 1 and is provided with a through hole 211. One end of the water suction pipe 22 extends into the through hole 211, and the other end of the water suction pipe 22 is connected to a water pumping part 4. In this embodiment, the water pumping part 4 is preferably a water pump.

[0046] The absorbent cotton 21 continuously absorbs the seepage water in the seepage well 10. When the absorbent cotton 21 is squeezed, the water absorption pipe 22 extends out of the through hole 211 and fits in the gap with the absorbent cotton 21. The squeezed out water is located on the surface of the absorbent cotton 21, sucked by the water pump, and transferred out of the seepage well 10 through the water absorption pipe 22.

[0047] Correspondingly, refer to Figure 3 and Figure 4 The water suction assembly 2 includes a squeeze plate 31, a movable disc 32 and a drive rod 33. The squeeze plate 31 is provided with a avoidance hole for the water suction pipe 22 to pass through in the center, and is slidably connected to the cylinder 1. Specifically, the squeeze plate 31 is in the shape of a circular plate, and the diameter of the squeeze plate 31 is larger than the inner diameter of the cylinder 1 and smaller than the outer diameter of the cylinder 1. The bottom side of the cylinder 1 is provided with a chute 11 along its length direction. The edge of the squeeze plate 31 extends into the chute 11 and slides along the opening direction of the chute 11.

[0048] The movable disk 32 is rotatably connected in the cylinder 1, one end of the driving rod 33 is rotatably connected to the edge of the movable disk 32, and the other end of the driving rod 33 is rotatably connected to the extrusion plate 31. A driving member 5 is connected to one side of the movable disk 32 for driving the movable disk 32 to rotate. In this embodiment, the driving member 5 is a driving motor.

[0049] In addition, a mounting plate 34 is provided in the cylinder 1, and two mounting plates 34 are provided. The two mounting plates 34 are arranged opposite to each other in the cylinder 1 and are detachably connected to the cylinder 1 for installing the extrusion assembly 3. Specifically, there are two movable disks 32 and two drive rods 33, with one movable disk 32 and one drive rod 33 as a group, which are arranged in a one-to-one correspondence with the two mounting plates 34. The movable disk 32 is rotatably connected to the bottom side of the mounting plate 34, and the driving member 5 is detachably connected to the mounting plate 34 and drives the movable disk 32 to rotate.

[0050] When the driving member 5 drives the movable disk 32 to rotate, the driving rod 33 drives the extrusion plate 31 to reciprocate along the length direction of the cylinder 1, thereby squeezing the absorbent cotton 21. The squeezed absorbent cotton 21 is fitted with the gap between the water absorption pipe 22, and the squeezed water is extracted from the water absorption pipe 22.

[0051] It should be noted that a plurality of water holes are formed on the extrusion plate 31 , and the water holes are evenly distributed on the extrusion plate 31 . When the water in the absorbent cotton 21 is squeezed out, it will pass through the extrusion plate 31 through the water holes.

[0052] Reference Figure 3 and Figure 4 A filter plate 6 is provided on the bottom side of the absorbent cotton 21. The filter plate 6 is detachably connected to the cylinder 1 and is provided with a plurality of sieve holes to preliminarily intercept the silt carried by the seepage water, preventing excessive silt from entering the absorbent cotton 21 and interfering with the water absorption performance of the absorbent cotton 21, thereby increasing the service life of the absorbent cotton 21 and reducing the number of times the absorbent cotton 21 needs to be replaced.

[0053] Reference Figure 2 and Figure 4 The cylinder 1 includes a cylinder body 12 and a top plate 13. The top plate 13 is detachably connected to the cylinder body 12 and is provided with a through hole 131 for the suction pipe 22 to pass through. When the extrusion assembly 3 is installed in the cylinder 1, the top plate 13 or the filter plate 6 on the bottom side of the cylinder 1 can be removed. In addition, the cylinder 1 is formed by splicing multiple arc-shaped plates to facilitate the production and installation of the cylinder 1.

[0054] Reference Figure 1 The water suction pipe 22 includes a first connecting pipe 221 and a second connecting pipe 222. The second connecting pipe 222 is inserted into the first connecting pipe 221 and is rotatably connected to the second connecting pipe 222. The other end of the second connecting pipe 222 is threadedly connected to the drive sleeve 23. Figure 2 and Figure 3 The driving sleeve 23 is sleeved on the second connecting tube 222, and a plurality of limit blocks are arranged around the circumference of the extrusion plate 31. The side wall of the slide 11 is provided with a limit groove 111 corresponding to the plurality of limit blocks. The limit groove 111 is opened along the length direction of the cylinder 1, and the limit block is slidably connected in the limit groove 111.

[0055] In this embodiment, there are multiple (preferably two) limit blocks. When the second connecting tube 222 rotates, the limit groove 111 constrains the limit blocks in the driving sleeve 23, causing the driving sleeve 23 to slide along the length direction of the second connecting tube 222.

[0056] Further, refer to Figure 3 and Figure 4 A connecting rod 24 is provided between the driving sleeve 23 and the extrusion plate 31. There are multiple connecting rods 24, which are arranged around the driving sleeve 23. One end of the connecting rod 24 is connected to the driving sleeve 23, and the other end of the connecting rod 24 is connected to the extrusion plate 31.

[0057] When the driving sleeve 23 moves toward the top plate 13 along the length direction of the second connecting rod 242, the connecting rod 24 drives the extrusion plate 31 to move upward in the slide groove 11 until it abuts against the top wall of the slide groove 11. At this time, if the driving sleeve 23 continues to move upward, it will drive the extrusion assembly 3 and the cylinder 1 to move upward synchronously, that is, the extrusion assembly 3 and the cylinder 1 climb along the second connecting rod 242.

[0058] It should be noted that, since the extrusion plate 31 will also drive the connecting rod 24 to move when squeezing the absorbent cotton 21, in this embodiment, the connecting rod 24 is retractable and mainly includes a first connecting rod 241 and a second connecting rod 242. One end of the first connecting rod 241 is connected to the extrusion plate 31, and the other end of the second connecting rod 242 is inserted into the second connecting rod 242 and is slidably connected to the second connecting rod 242.

[0059] When the extrusion plate 31 is in the upper position during the movement (at this time, the extrusion plate 31 is in contact with the top wall of the slide 11, the distance between the extrusion plate 31 and the absorbent cotton 21 is the largest, and the connecting rod 24 cannot be shortened any further), when the extrusion plate 31 is in the lower position during the movement (that is, the position where the absorbent cotton 21 is squeezed to the greatest extent, the connecting rod 24 is in a state where it cannot be extended any further).

[0060] Further, refer to Figure 1, and also includes a cover plate 7 arranged on the seepage well 10. When the extrusion assembly 3 and the pumping assembly are processing the seepage water, the cover plate 7 seals the seepage well 10 to prevent rainwater from entering the seepage well 10 on rainy days. In addition, a fixing sleeve 9 is provided on the cover plate 7. The fixing sleeve 9 is sleeved on the second connecting pipe 222 and is detachably connected to the cover plate 7. The fixing sleeve 9 fixes the position of the second connecting rod 242 to ensure that the extrusion assembly 3 and the cylinder 1 can stably climb along the second connecting rod 242. When the cylinder 1 is against the cover plate 7, the jacking setting is used to lift the cover plate 7, and the cylinder 1 and the extrusion assembly 3 can be removed from the second connecting rod 242.

[0061] Reference Figure 5 and Figure 6 A plurality of auxiliary climbing components 8 are provided on the top plate 13. The plurality of auxiliary climbing components 8 are arranged around the top plate 13, including walking wheels 81 and auxiliary rods 82. Correspondingly, a plurality of insertion holes 132 are opened on the peripheral side wall of the top plate 13, which are arranged one-to-one corresponding to the plurality of auxiliary rods 82. One end of the auxiliary rod 82 is inserted into the insertion hole 132, and the other end of the auxiliary rod 82 is connected to the corresponding walking wheel 81.

[0062] When the cylinder 1 and the extrusion assembly 3 climb along the second connecting rod 242, the walking wheel 81 provides guidance for the movement of the cylinder 1, so that the cylinder 1 can exit the seepage well 10 more smoothly. In addition, an elastic element 83 is also provided in the insertion hole 132. One end of the elastic element 83 abuts against the bottom wall of the insertion hole 132, and the other end of the elastic element 83 abuts against the auxiliary rod 82, so as to shrink according to the actual size of the seepage well 10 to match seepage wells 10 of different sizes.

[0063] It should be noted that, in this embodiment, a chute 11 is provided on the peripheral side wall of the seepage well 10, and the walking wheel 81 extends into the chute 11. In order to better demonstrate the connection relationship between the auxiliary climbing component 8 and the chute 11, Figure 6 In the figure, the cover plate 7 is not shown.

[0064] The implementation principle of the embodiment of the present application is as follows: the precipitation device is installed in the seepage well 10, the absorbent cotton 21 can absorb the seepage water, and the mud and sand carried by the seepage water are intercepted by the absorbent cotton 21. When the driving member 5 drives the movable disk 32 to rotate, the driving rod 33 drives the squeezing plate 31 to reciprocate along the length direction of the cylinder 1, thereby squeezing the absorbent cotton 21. The squeezed absorbent cotton 21 and the water suction pipe 22 have a clearance fit, and the squeezed water is extracted from the water suction pipe 22, thereby preventing mud and sand from entering the water suction pipe 22 and clogging the water suction pipe 22.

[0065] When the construction of the foundation pit 20 is completed, the dewatering device needs to be recovered. At this time, the second connecting rod 242 is rotated, and the driving sleeve 23 moves toward the top plate 13 along the length direction of the second connecting rod 242. This connecting rod 24 will drive the extrusion plate 31 to move up in the slide 11 until it abuts against the top wall of the slide 11. At this time, if the driving sleeve 23 continues to move up, it will drive the extrusion assembly 3 and the cylinder 1 to move up synchronously, that is, the extrusion assembly 3 and the cylinder 1 climb along the second connecting rod 242.

[0066] In addition, the present application also discloses a construction method of the above-mentioned foundation pit 20 dewatering device, which is characterized by comprising the following steps:

[0067] S1. Open multiple seepage wells 10 around the foundation pit 20, and install multiple foundation pit 20 dewatering devices in the seepage wells 10 one by one, so that the absorbent cotton 21 fits the bottom wall of the seepage well 10 to absorb the seepage water;

[0068] S2. The movable disc 32 is rotated to drive the squeezing plate 31 to reciprocate along the length direction of the cylinder 1, squeezing the absorbent cotton 21 so that water seeps out of the absorbent cotton 21, and a gap is formed between the squeezed absorbent cotton 21 and the water absorption pipe 22;

[0069] S3. During the squeezing process, the water extraction member 4 is opened to extract the seeping water, and the extracted water is collected and transferred.

[0070] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A foundation pit dewatering device, characterized in that: include: Cylinder (1); A water suction component (2) is arranged in the cylinder (1), comprising a water-absorbing cotton (21) and a water-absorbing pipe (22); the water-absorbing cotton (21) is placed on the bottom side of the cylinder (1) and connected to the cylinder (1); a through hole (211) is provided on the water-absorbing cotton (21); one end of the water-absorbing pipe (22) extends into the through hole (211); and the other end of the water-absorbing pipe (22) is connected to a water-pumping member (4); An extrusion assembly (3) comprises an extrusion plate (31), a movable disc (32) and a driving rod (33); a central portion of the extrusion plate (31) is provided with an escape hole for the water suction pipe (22) to pass through, and the extrusion plate (31) is slidably connected to the cylinder (1); and the movable disc (32) is rotatably connected within the cylinder (1); The water suction pipe (22) comprises a first connecting pipe (221) and a second connecting pipe (222), wherein the second connecting pipe (222) is inserted into the first connecting pipe (221) and is rotatably connected to the first connecting pipe (221), and the other end of the second connecting pipe (222) is threadedly connected to a drive sleeve (23); The driving sleeve (23) is sleeved on the second connecting tube (222) and is provided with a limit block therein. The second connecting tube (222) is provided with a limit groove (2221) along its length direction. A connecting rod (24) is provided between the driving sleeve (23) and the extrusion plate (31). One end of the connecting rod (24) is connected to the driving sleeve (23), and the other end of the connecting rod (24) is connected to the extrusion plate (31). When the second connecting tube (222) rotates, the driving sleeve (23) climbs along the length direction of the second connecting tube (222), and a sliding groove (11) is provided on the cylinder (1) along its own length direction, and the top wall of the sliding groove (11) can abut against the extrusion plate (31); One end of the driving rod (33) is rotatably connected to the edge of the movable disk (32), and the other end of the driving rod (33) is rotatably connected to the extrusion plate (31). A driving member (5) is connected to one side of the movable disk (32) for driving the movable disk (32) to rotate, thereby driving the extrusion plate (31) to slide along the length direction of the cylinder (1) and squeeze the absorbent cotton (21).

2. A foundation pit dewatering device according to claim 1, characterized in that: A filter plate (6) is provided on the bottom side of the absorbent cotton (21), and the filter plate (6) is detachably connected to the cylinder (1) and is provided with a plurality of sieve holes.

3. The foundation pit dewatering device according to claim 1, characterized in that: A plurality of connecting rods (24) are provided, and the plurality of connecting rods (24) are arranged around the drive sleeve (23).

4. The foundation pit dewatering device according to claim 1, characterized in that: It also includes a cover plate (7) provided on the seepage well (10), wherein a fixing sleeve (9) is provided on the cover plate (7), and the fixing sleeve (9) is sleeved on the second connecting pipe (222) and is detachably connected to the cover plate (7).

5. The foundation pit dewatering device according to claim 1, characterized in that: The cylinder (1) comprises a cylinder body (12) and a top plate (13); the top plate (13) is detachably connected to the cylinder body (12) and is provided with a through hole (131) for the water suction pipe (22) to pass through.

6. The foundation pit dewatering device according to claim 5, characterized in that: The auxiliary climbing assembly (8) further comprises a walking wheel (81) and an auxiliary rod (82); an insertion hole (132) is provided on the peripheral side wall of the top plate (13); one end of the auxiliary rod (82) is inserted into the insertion hole (132), and the other end of the auxiliary rod (82) is connected to the walking wheel (81).

7. The foundation pit dewatering device according to claim 6, characterized in that: An elastic element (83) is further provided in the insertion hole (132), one end of the elastic element (83) abuts against the bottom wall of the insertion hole (132), and the other end of the elastic element (83) abuts against the auxiliary rod (82).

8. The construction method of the foundation pit dewatering device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. A plurality of seepage wells (10) are opened around the foundation pit (20), and a plurality of foundation pit (20) dewatering devices are installed in the seepage wells (10) in a one-to-one correspondence, so that the absorbent cotton (21) fits in contact with the bottom wall of the seepage well (10) to absorb the seepage water; S2, rotating the movable disc (32) to drive the extrusion plate (31) to reciprocate along the length direction of the cylinder (1), squeezing the absorbent cotton (21) so that water seeps out of the absorbent cotton (21), and forming a gap between the squeezed absorbent cotton (21) and the water absorption pipe (22); S3. During the squeezing process, the water extraction member (4) is opened to extract the leaked water, and the extracted water is collected and transferred.

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