Foundation pit dewatering device and construction method

Abstract

The invention relates to a foundation pit dewatering device and a construction method, and relates to the technical field of building construction, the foundation pit dewatering device comprises a cylinder body, a water suction assembly and an extrusion assembly, the water suction assembly is arranged in the cylinder body and comprises absorbent cotton and a water suction pipe, the absorbent cotton is arranged on the bottom side of the cylinder body and connected with the cylinder body, a through hole is formed in the absorbent cotton, and the water suction pipe is arranged in the cylinder body; one end of the water suction pipe extends into the through hole, and the other end of the water suction pipe is connected with a water pumping piece; the extrusion assembly comprises an extrusion plate, a movable disc and a driving rod, an avoiding hole allowing the water suction pipe to penetrate through is formed in the center of the extrusion plate, the extrusion plate is slidably connected with the barrel, and the movable disc is rotationally connected into the barrel; one end of the driving rod is rotationally connected to the edge of the movable disc, the other end of the driving rod is rotationally connected with the squeezing plate, and a driving part is connected to one side of the movable disc and used for driving the movable disc to rotate, driving the squeezing plate to slide in the length direction of the barrel and squeezing the absorbent cotton. Sediment can be prevented from entering the water suction pipe, and normal operation of the device is guaranteed.

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 bottom of the excavation 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 and to prevent slope instability, foundation sand flow, pit bottom uplift, pit bottom pipe gushing and a decrease in foundation bearing capacity.

[0003] When dewatering the foundation pit, multiple infiltration wells are usually opened around the foundation pit. The excavation depth of the infiltration well is greater than the foundation pit, so that the seepage water enters the infiltration well first. A water pump and a suction pipe are provided at the infiltration 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 infiltration well. When the water pump is started, the water in the infiltration well is pumped away 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 the present application is to provide a foundation pit dewatering device and a construction method that can effectively treat water 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 solution: A foundation pit dewatering device and construction method, comprising: Cylinder; A water suction assembly is arranged in the cylinder body, comprising water-absorbing cotton and a water-absorbing pipe. The water-absorbing cotton is placed on the bottom side of the cylinder body and 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. The extrusion assembly comprises 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. 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.

[0007] By adopting the above technical solution, the precipitation device is installed in the seepage well, the absorbent cotton can absorb the seepage water, and the mud and sand carried by the seepage water are intercepted by the absorbent cotton. When the driving member 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 suction pipe is matched, and the squeezed water is extracted from the suction pipe, thereby preventing mud and sand from entering the suction pipe and clogging the suction pipe.

[0008] 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.

[0009] By adopting the above technical solution and setting a filter plate, the sediment carried by the seepage water can be further intercepted.

[0010] 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 is 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, 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; When the second connecting tube rotates, the driving sleeve climbs along the length direction of the second connecting tube, and a slide groove is provided on the cylinder along its length direction, and the top wall of the slide groove can abut against the extrusion plate; A plurality of limit blocks are arranged around the circumference of the extrusion plate, and limit grooves corresponding to the plurality of limit blocks are arranged on the side wall of the slide groove. The limit grooves are arranged along the length direction of the cylinder, and the limit blocks are slidably connected in the limit grooves.

[0011] By adopting the above technical solution, when the second connecting tube rotates, since the limiting block is limited by the limiting groove, the driving sleeve will move toward the top plate along the length direction of the second connecting tube, 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 tube, thereby facilitating the recovery of the precipitation device.

[0012] Optionally, a plurality of connecting rods are provided, and the plurality of connecting rods are arranged around the driving sleeve.

[0013] 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 climbing stability of the extrusion plate and the cylinder is improved.

[0014] Optionally, it also includes a cover plate arranged on the seepage well, wherein the cover plate is provided with a fixing sleeve, and the fixing sleeve is arranged on the second connecting pipe and is detachably connected to the cover plate.

[0015] By adopting the above technical solution, the setting of the cover plate can close 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.

[0016] Optionally, the cylinder body 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.

[0017] By adopting the above technical solution, the top plate can be disassembled to facilitate the installation of the extrusion component and the replacement of the absorbent cotton.

[0018] Optionally, it also includes an auxiliary climbing component, 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.

[0019] By adopting the above technical solution, when the precipitation device is installed in the seepage well, or when the precipitation device is taken out from the seepage well, the walking wheel can provide guidance for the movement of the cylinder, and the disassembly and assembly of the precipitation device is more convenient.

[0020] 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.

[0021] 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.

[0022] In a second aspect, the present application provides a construction method according to the above foundation pit dewatering device, comprising the following steps: S1. A plurality of seepage wells are opened around the foundation pit, and a plurality of foundation pit dewatering devices are installed 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; 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; S3. During the extrusion process, the water extraction component is opened to extract the seeping water, and the extracted water is collected and transferred.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Install the precipitation device in the seepage well. 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 member drives the movable disk to rotate, the driving rod will drive the extrusion plate to reciprocate along the length direction of the cylinder, thereby squeezing the absorbent cotton. The gap between the squeezed absorbent cotton and the suction pipe is matched, and the squeezed water is extracted from the suction pipe, thereby preventing mud and sand from entering the suction pipe and clogging the suction pipe.

[0024] 2. When the second connecting tube rotates, since the limiting block is limited by the limiting groove, the driving sleeve will move toward the top plate along the length direction of the second connecting tube, 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 tube, thereby facilitating the recovery of the precipitation device.

[0025] 3. When installing the precipitation device on the seepage well or taking the precipitation device out of the seepage well, the walking wheel can provide guidance for the movement of the cylinder, making it more convenient to disassemble and assemble the precipitation device, and 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

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of the foundation pit dewatering device in the present application installed in the seepage well; Figure 2 It is a schematic diagram of the cross-sectional structure of the foundation pit dewatering device in this application; Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A; Figure 4 It is a schematic diagram of the cross-sectional structure of the foundation pit dewatering device in this application after the cylinder body is removed; Figure 5 is a schematic cross-sectional view of the auxiliary climbing assembly and the top plate in the present application; 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 the present application.

[0027] 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, pumping member; 5, drive member; 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

[0028] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0029] 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, wherein the water suction component 2 and the extrusion component 3 are both placed in the cylinder 1, combined with 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 member 4. In this embodiment, the water pumping member 4 is preferably a water pump.

[0030] 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 with the gap of the absorbent cotton 21. The squeezed water is located on the surface of the absorbent cotton 21, and is sucked by the water pump and transferred out of the seepage well 10 from the water absorption pipe 22.

[0031] Correspondingly, refer to Figure 3 and Figure 4 The water suction assembly 2 includes a squeeze plate 31, a movable disc 32 and a driving rod 33. The squeeze plate 31 is provided with an avoidance hole for the water suction pipe 22 to pass through in the center, and is slidably connected with 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 slide groove 11 along its length direction. The edge of the squeeze plate 31 extends into the slide groove 11 and slides along the opening direction of the slide groove 11. 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.

[0032] 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 oppositely arranged in the cylinder 1 and are detachably connected to the cylinder 1 for installing the extrusion assembly 3. Specifically, two movable disks 32 and two driving rods 33 are provided, with one movable disk 32 and one driving rod 33 as a group, which are arranged one by one 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.

[0033] When the driving member 5 drives the movable disk 32 to rotate, the driving rod 33 will drive 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 and the water absorption pipe 22 have a clearance fit, and the squeezed water is extracted from the water absorption pipe 22.

[0034] 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.

[0035] Reference Figure 3 and Figure 4 A filter plate 6 is arranged 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, thereby preventing excessive silt from entering the absorbent cotton 21 and interfering with the water absorption performance of the absorbent cotton 21, so as to increase the service life of the absorbent cotton 21 and reduce the number of times the absorbent cotton 21 is replaced.

[0036] 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 a plurality of arc-shaped plates to facilitate the production and installation of the cylinder 1.

[0037] 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 driving sleeve 23. Figure 2 and Figure 3 The driving sleeve 23 is sleeved on the second connecting pipe 222, and a plurality of limit blocks are arranged around the circumference of the extrusion plate 31. A limit groove 111 corresponding to the plurality of limit blocks is provided on the side wall of the slide groove 11. The limit groove 111 is provided along the length direction of the cylinder 1, and the limit block is slidably connected in the limit groove 111.

[0038] In this embodiment, a plurality of limit blocks (preferably two) are provided. When the second connecting tube 222 rotates, the limit groove 111 constrains the limit block in the driving sleeve 23 to make the driving sleeve 23 slide along the length direction of the second connecting tube 222 .

[0039] Further, refer to Figure 3 and Figure 4 A connecting rod 24 is arranged between the driving sleeve 23 and the extrusion plate 31 . A plurality of connecting rods 24 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 .

[0040] 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.

[0041] It should be noted that, when the extrusion plate 31 squeezes the absorbent cotton 21, it also drives the connecting rod 24 to move. In the present 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.

[0042] 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 groove 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, when the absorbent cotton 21 is squeezed to the greatest extent, the connecting rod 24 cannot be extended any further).

[0043] Further, refer to Figure 1, and also includes a cover plate 7 covered on the seepage well 10. When the extrusion component 3 and the pumping component handle the seepage, 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 component 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 cover plate 7 is lifted using a lifting setting to remove the cylinder 1 and the extrusion component 3 from the second connecting rod 242.

[0044] Reference Figure 5 and Figure 6 A plurality of auxiliary climbing components 8 are arranged on the top plate 13, and 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 by 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.

[0045] 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, and 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.

[0046] 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 show the connection relationship between the auxiliary climbing assembly 8 and the chute 11, Figure 6 In the figure, the cover plate 7 is not shown.

[0047] 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 gap between the squeezed absorbent cotton 21 and the water absorption pipe 22 is matched, and the squeezed water is extracted from the water absorption pipe 22, thereby preventing mud and sand from entering the water absorption pipe 22 and blocking the water absorption pipe 22. 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 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 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.

[0048] In addition, the present application also discloses a construction method according to the above foundation pit 20 dewatering device, which is characterized by comprising the following steps: S1. A plurality of seepage wells 10 are opened around the foundation pit 20, and a plurality of dewatering devices of the foundation pit 20 are installed 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; S2, rotating the movable disk 32 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 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 seeping water, and the extracted water is collected and transferred.

[0049] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present 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 formed 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-drawing member (4); An extrusion assembly (3) comprises an extrusion plate (31), a movable disk (32) and a driving rod (33); the extrusion plate (31) is provided with an avoidance hole at the center thereof for the water suction pipe (22) to pass through, and is slidably connected to the cylinder (1); and the movable disk (32) is rotatably connected inside 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). One side of the movable disk (32) is connected to a driving member (5) 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 to 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); the filter plate (6) is detachably connected to the cylinder (1) and is provided with a plurality of sieve holes.

3. A foundation pit dewatering device according to claim 1, characterized in that: 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); The other end of the second connecting tube (222) is threadedly connected to a driving sleeve (23), the driving sleeve (23) being sleeved on the second connecting tube (222), a connecting rod (24) being provided between the driving sleeve (23) and the extrusion plate (31), one end of the connecting rod (24) being connected to the driving sleeve (23), and the other end of the connecting rod (24) being 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 slide groove (11) is provided on the cylinder (1) along its length direction, and the top wall of the slide groove (11) can abut against the extrusion plate (31); A plurality of limit blocks are arranged around the periphery of the extrusion plate (31), and a corresponding limit groove (111) is provided on the side wall of the slide groove (11) and is arranged one-to-one with the plurality of limit blocks. The limit groove (111) is provided along the length direction of the cylinder (1), and the limit block is slidably connected in the limit groove (111).

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

5. The foundation pit dewatering device according to claim 3, characterized in that: It also comprises a cover plate (7) arranged on the seepage well (10), wherein a fixing sleeve (9) is arranged 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).

6. 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.

7. A foundation pit dewatering device according to claim 6, characterized in that: The auxiliary climbing assembly (8) includes 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).

8. A foundation pit dewatering device according to claim 7, characterized in that: 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).

9. The construction method of the foundation pit dewatering device according to any one of claims 1 to 8, 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 dewatering devices of the foundation pit (20) are installed in the seepage wells (10) in a one-to-one correspondence, so that the absorbent cotton (21) fits the bottom wall of the seepage well (10) to absorb the seepage water; S2, rotating the movable disk (32) 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 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 seeping water, and the extracted water is collected and transferred.

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