Deep foundation pit in dewatering well plugging device and construction method

Abstract

The application discloses a deep foundation pit in-pit dewatering well plugging device and a construction method, belongs to the technical field of dewatering well plugging, and comprises a steel pipe sleeve arranged in the dewatering well, a moving block arranged in the steel pipe sleeve, an annular cavity formed in the moving block, a water outlet hole formed in the inner top surface of the annular cavity, a water inlet hole formed in the inner bottom surface of the annular cavity, a spring one fixed to the inner top surface of the annular cavity, a sealing ball fixed to the bottom end of the spring one and used for plugging the water inlet hole, a fixed plate fixed in the steel pipe sleeve and located below the moving block, a top rod fixed to the top surface of the fixed plate and penetrating through the water inlet hole, and a top end of the top rod in abutment with the outer circumferential surface of the sealing ball, wherein a driving mechanism for driving the moving block to move vertically is arranged on the steel pipe sleeve, and a fixing assembly for fixing the steel pipe sleeve in the dewatering well is arranged on the steel pipe sleeve. The application has the effect of fixing the steel pipe sleeve in the dewatering well conveniently and reducing the possibility that the steel pipe sleeve is washed out of the dewatering well by water flow.

Description

Technical Field

[0001] This invention relates to the technical field of dewatering well sealing, and in particular to a device and construction method for sealing dewatering wells in deep foundation pits. Background Technology

[0002] A dewatering well is a small well used to drain water accumulated in mine tunnels or mining areas. Typically, during mining operations, there is an underground tunnel drainage system that allows water in the mining area or tunnels to be directed along ditches into dewatering wells at regular intervals. The water then flows into a water tank through underground tunnels connected to the dewatering wells, and is pumped to the surface through dedicated drainage wells or flows directly out of the surface through drainage tunnels.

[0003] In related technologies, Chinese utility model patent CN210946856U discloses a dewatering well sealing device, including a platform, a water pump, a water pipe, and a steel pipe sleeve. The steel pipe sleeve is fitted inside an external dewatering well. A through hole is opened on the platform, and the upper end of the steel pipe sleeve is connected to the through hole. A second layer plate is provided inside the steel pipe sleeve, and a first layer plate with a central opening is provided above the second layer plate. The outer side of the first layer plate is slidably connected to the inner wall of the steel pipe sleeve. An inner ring plate and an outer ring plate are provided on the inner side of the lower surface of the first layer plate. A plate is fitted on the outer side of the inner ring plate and the second layer plate. The outer ring plate has a through hole. A locking block is hinged to the side surface of the second layer plate. The steel pipe sleeve has several annular grooves. The locking block passes through the through hole on the side surface of the outer ring plate and contacts the annular groove. A frustum is fixed on the upper surface of the second layer plate. The frustum is hollow inside. Two baffles are symmetrically arranged inside the frustum. A rectangular hole is opened on the upper surface of the frustum. The direction of the rectangular hole is perpendicular to the direction of the baffle. A flat rod is installed inside the frustum. A threaded rod is provided on the upper surface of the flat rod. The upper end of the threaded rod extends out of the steel pipe sleeve.

[0004] Regarding the aforementioned technologies, when the dewatering well is sealed, the connection between the steel pipe sleeve and the dewatering well is not strong enough because the steel pipe sleeve is inserted into the dewatering well. When the water pressure in the dewatering well is too high, the water flow will have an impact force on the second layer plate, which may cause the steel pipe sleeve to be washed out of the dewatering well. Summary of the Invention

[0005] To address the issue of excessive water pressure in dewatering wells causing water flow to impact the second-layer slab and potentially leading to the steel pipe sleeve being ejected from the dewatering well, this application provides a sealing device and construction method for dewatering wells in deep foundation pits.

[0006] The technical solution for the deep foundation pit dewatering well sealing device provided in this application is as follows:

[0007] A sealing device for dewatering wells in deep foundation pits includes a steel pipe sleeve installed inside the dewatering well. A movable block is installed inside the steel pipe sleeve, and an annular cavity is formed within the movable block. A water outlet is formed on the inner top surface of the annular cavity, and a water inlet is formed on the inner bottom surface of the annular cavity. A spring is fixed to the inner top surface of the annular cavity, and a sealing ball for sealing the water inlet is fixed to the bottom end of the spring. A fixing plate is fixed inside the steel pipe sleeve, located below the movable block. A top rod is fixed to the top surface of the fixing plate, with its top end passing through the water inlet and abutting against the outer circumferential surface of the sealing ball. A driving mechanism for driving the movable block to move vertically is provided on the steel pipe sleeve, and a fixing assembly for fixing the steel pipe sleeve inside the dewatering well is provided on the steel pipe sleeve.

[0008] By adopting the above technical solution, when it is necessary to seal the dewatering well in the deep foundation pit, the driving mechanism drives the moving block to move upward, causing the top rod to disengage from the water inlet. The sealing ball moves downward under the elastic force of the spring, blocking the water inlet. Then, the steel pipe sleeve is fixed in the dewatering well by the fixing component. Sand and gravel are then filled into the steel pipe sleeve to seal the dewatering well in the deep foundation pit. The fixing component also fixes the steel pipe sleeve in the dewatering well, thereby reducing the possibility that the water flow will impact the moving block and cause the steel pipe sleeve to be flushed out of the dewatering well when the water pressure in the dewatering well is too high.

[0009] Preferably, the inner circumferential surface of the steel pipe sleeve is provided with an annular groove, the outer circumferential surface of the movable block is in contact with the inner circumferential surface of the annular groove, a rubber ring is fixed on the inner top surface of the annular groove, and the bottom surface of the rubber ring can abut against the top surface of the movable block.

[0010] By adopting the above technical solution, when the drive mechanism drives the moving block to move upward, the top surface of the moving block abuts against the bottom surface of the rubber ring, thereby sealing the connection between the moving block and the steel pipe sleeve and reducing the possibility of water in the dewatering well seeping out along the gap between the moving block and the steel pipe sleeve.

[0011] Preferably, the inner circumferential surface of the annular groove is provided with a plurality of through holes, and the outer circumferential surface of the movable block is provided with a plurality of slots corresponding to the through holes. The fixing component includes a rod disposed in the slot, the end of the rod away from the movable block being inserted into the through hole. The side of the slot near the central axis of the movable block is an inclined surface, and the distance between the top of the inclined surface and the central axis of the movable block is less than the distance between the bottom of the inclined surface and the central axis of the movable block.

[0012] By adopting the above technical solution, when the moving block moves upward, the inclined plane pushes the insertion rod, causing the insertion rod to move in a direction away from the central axis of the moving block, so that the insertion rod passes through the through hole and is inserted into the inner wall of the dewatering well, thereby fixing the steel pipe sleeve inside the dewatering well. This reduces the possibility that when the dewatering well is blocked, the water flow inside the dewatering well is large and the steel pipe sleeve will be washed out of the dewatering well.

[0013] Preferably, a limiting block is provided on the outer peripheral surface of the insertion rod, and a second spring is provided on the periphery of the insertion rod. One end of the second spring is fixedly connected to the inner wall of the annular groove, and the other end of the second spring is fixedly connected to the side of the limiting block away from the central axis of the moving block.

[0014] By adopting the above technical solution, the limiting block moves towards the central axis of the moving block under the elastic force of the second spring. The limiting block drives the insertion rod to move towards the central axis of the moving block, so that the insertion rod moves into the through hole one, thereby reducing the possibility of the insertion rod moving out of the through hole one.

[0015] Preferably, the outer peripheral surface of the movable block is provided with a sliding groove, and a fixed block is slidably disposed in the sliding groove. A spring three is fixed to the side of the fixed block near the central axis of the movable block. The end of the spring three away from the fixed block is fixed to the inner side of the sliding groove near the central axis of the movable block. The inner peripheral surface of the annular groove one is provided with a mounting groove corresponding to the sliding groove. A plurality of positioning blocks are fixed in the mounting groove. The end of the fixed block away from the spring three can be inserted between two adjacent positioning blocks. The top surface of the positioning block is provided with an inclined surface two, and the top surface of the fixed block is provided with an inclined surface three. The inclined surface two can abut against the inclined surface three.

[0016] By adopting the above technical solution, when the moving block moves upward, inclined surface one abuts against inclined surface two. When the moving block moves upward, the top rod disengages from the water inlet hole, the top surface of the moving block abuts against the bottom surface of the rubber ring, inclined surface two disengages from inclined surface one, and the fixed block moves away from the central axis of the moving block under the elastic force of spring three, so that the fixed block is inserted between two adjacent positioning blocks, and the bottom surface of the fixed block abuts against the top surface of the positioning block, thereby reducing the possibility of the moving block moving downward when sand and gravel are filled into the steel pipe sleeve.

[0017] Preferably, the driving mechanism includes a stud fixed to the top surface of the movable block, a platform at the top of the steel pipe sleeve, the platform being fixed to the ground, a circular hole on the top surface of the platform, a support frame fixed on the platform, a support plate fixed on the support frame, a second through hole on the top surface of the support plate, a screw threaded through the second through hole, the screw being slidably connected to the support plate in a vertical direction, a connecting pipe sleeved at the bottom end of the screw, the connecting pipe being rotatably connected to the screw, the top end of the stud being inserted into the connecting pipe, the stud being threadedly connected to the connecting pipe, and a driving assembly for driving the screw to move vertically on the support plate.

[0018] By adopting the above technical solution, the platform is fixed at the wellhead of the dewatering well, the top of the stud is inserted into the connecting pipe, the connecting pipe is rotated so that the top of the stud is screwed into the connecting pipe, and then the drive assembly drives the screw to move upward. The screw drives the stud to move upward through the connecting pipe, thereby causing the stud to drive the moving block to move upward.

[0019] Preferably, the driving assembly includes a rotating sleeve sleeved on the screw, the rotating sleeve being threadedly connected to the screw, the bottom end of the rotating sleeve being rotatably connected to the top surface of the support plate, a motor being fixed on the top surface of the support plate, a first gear being provided on the output shaft of the motor, a second gear being provided on the rotating sleeve, and the first gear meshing with the second gear.

[0020] By adopting the above technical solution, the motor is started, the output shaft of the motor drives gear one to rotate, gear one drives gear two to rotate, gear two drives the rotating sleeve to rotate, thereby causing the rotating sleeve to drive the screw to move upward.

[0021] Preferably, a ring is fixed on the inner circumferential surface of the connecting pipe, and an annular groove is formed on the outer circumferential surface of the screw, with the ring disposed within the annular groove.

[0022] By adopting the above technical solution, when it is necessary to remove the connecting tube from the stud, the rotating tube is rotated and moves upward. The rotating tube drives the ring to move upward in the annular groove, thereby facilitating the connection tube to detach from the stud.

[0023] Preferably, the outer peripheral surface of the screw is provided with a sliding groove, and the inner peripheral surface of the second through hole is provided with a slider, which is slidably disposed in the sliding groove along the vertical direction.

[0024] By adopting the above technical solution, when the rotating sleeve drives the screw to move vertically, the slider moves within the groove, thereby reducing the possibility of the screw following the rotation of the rotating sleeve.

[0025] A method for sealing dewatering wells inside deep foundation pits includes the following steps:

[0026] S1: When it is necessary to seal the dewatering well, fix the platform at the wellhead, insert the top of the stud into the connecting pipe, rotate the connecting pipe to screw the stud into the connecting pipe, and connect the stud and the screw rod through the connecting pipe.

[0027] S2: Start the motor, the motor drives gear one to rotate, gear one drives gear two to rotate, gear two drives the rotating sleeve to rotate, the rotating sleeve drives the screw to move upward, the screw drives the stud to move upward through the connecting pipe, so that the stud drives the moving block to move upward, so that the push rod disengages from the water inlet hole, and the sealing ball moves downward under the elastic force of spring one, blocking the water inlet hole;

[0028] S3: When the moving block moves upward, the inclined plane pushes the insertion rod to move away from the central axis of the moving block, so that the insertion rod passes through the through hole and is inserted into the wall of the dewatering well, thereby fixing the steel pipe sleeve inside the dewatering well;

[0029] S4: Finally, rotate the connecting pipe to detach it from the stud, remove the platform, and fill the steel pipe sleeve with sand and gravel to complete the sealing of the dewatering well in the deep foundation pit.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. When it is necessary to seal the dewatering well in the deep foundation pit, the moving block is driven upward by the drive mechanism, so that the top rod is disengaged from the water inlet. The sealing ball moves downward under the elastic force of the spring, and the water inlet is blocked by the sealing ball. Then, the steel pipe sleeve is fixed in the dewatering well by the fixing component. Then, sand and gravel are filled in the steel pipe sleeve to seal the dewatering well in the deep foundation pit. The fixing component is used to fix the steel pipe sleeve in the dewatering well, thereby reducing the possibility that the water flow will impact the moving block and cause the steel pipe sleeve to be washed out of the dewatering well when the water pressure in the dewatering well is too high.

[0032] 2. When the moving block moves upward, the inclined plane pushes the insert rod, causing the insert rod to move away from the central axis of the moving block, so that the insert rod passes through the through hole and is inserted into the inner wall of the dewatering well, thereby fixing the steel pipe sleeve inside the dewatering well, reducing the possibility that the steel pipe sleeve will be washed out of the dewatering well when the water flow inside the dewatering well is large when the dewatering well is blocked.

[0033] 3. When the moving block moves upward, inclined plane one abuts against inclined plane two. As the moving block moves upward, the top rod disengages from the water inlet, and the top surface of the moving block abuts against the bottom surface of the rubber ring. Inclined plane two disengages from inclined plane one. Under the elastic force of spring three, the fixed block moves away from the central axis of the moving block, so that the fixed block is inserted between two adjacent positioning blocks. The bottom surface of the fixed block abuts against the top surface of the positioning block, thereby reducing the possibility of the moving block moving downward when sand and gravel are filled into the steel pipe sleeve. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the deep foundation pit dewatering well sealing device according to an embodiment of this application.

[0035] Figure 2 This is a cross-sectional view of the steel pipe sleeve in an embodiment of this application.

[0036] Figure 3 This is a cross-sectional view of the movable block in an embodiment of this application.

[0037] Figure 4 yes Figure 3 Enlarged diagram of point A in the middle.

[0038] Reference numerals: 1. Steel pipe sleeve; 11. Annular groove one; 12. Rubber ring; 13. Fixing plate; 14. Top rod; 2. Moving block; 21. Annular cavity; 22. Water inlet hole; 23. Water outlet hole; 24. Spring one; 25. Sealing ball; 26. Guide block; 27. Guide groove; 28. Stud; 3. Embedded groove; 31. Through hole one; 32. Inclined surface one; 33. Insert rod; 34. Limiting block; 35. Spring two; 4. Sliding groove; 41. Fixing block; 42. Spring 3; 43. Mounting slot; 44. Positioning block; 45. Inclined surface 2; 46. Inclined surface 3; 5. Platform; 51. Circular hole; 52. Support frame; 521. Support plate; 53. Through hole 2; 54. Screw; 55. Slider; 56. Slide groove; 57. Connecting pipe; 58. Annular groove 2; 59. Circular ring; 6. Water pump; 61. Pumping pipe; 62. Discharge pipe; 7. Motor; 71. Gear 1; 72. Rotating sleeve; 73. Gear 2. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0040] This application discloses a device for sealing dewatering wells in deep foundation pits.

[0041] Reference Figure 1 and Figure 2 A sealing device for dewatering wells in deep foundation pits includes a steel pipe sleeve 1 installed inside the dewatering wells in the deep foundation pits. An annular groove 11 is provided on the inner circumferential surface of the steel pipe sleeve 1. A movable block 2 is installed inside the steel pipe sleeve 1. The outer circumferential surface of the movable block 2 is in contact with the inner circumferential surface of the annular groove 11. A rubber ring 12 is fixed on the inner top surface of the annular groove 11. The top panel of the movable block 2 can abut against the bottom surface of the rubber ring 12.

[0042] Reference Figure 1 and Figure 2The movable block 2 has two annular cavities 21, which are symmetrically arranged along the central axis of the movable block 2. Each annular cavity 21 has a water inlet hole 22 on its inner bottom surface and a water outlet hole 23 on its inner top surface. A spring 24 is fixed to the inner top surface of the annular cavity 21, and a sealing ball 25 for sealing the water inlet hole 22 is fixed to the bottom end of the spring 24. Two guide blocks 26 are fixed to the outer circumferential surface of the sealing ball 25, which are symmetrically arranged along the central axis of the sealing ball 25. Two guide grooves 27 are formed on the inner circumferential surface of the annular cavity 21, and the two guide blocks 26 are slidably disposed vertically within the two guide grooves 27. A horizontally fixed plate 13 is fixed inside the steel pipe sleeve 1. The fixed plate 13 is located below the movable block 2. Two push rods 14 are fixed on the top surface of the fixed plate 13. The top ends of the two push rods 14 are respectively inserted into the two water inlet holes 22. The outer peripheral surface of the push rod 14 and the inner peripheral surface of the water inlet hole 22 are spaced apart. The top end of the push rod 14 abuts against the outer peripheral surface of the sealing ball 25.

[0043] Reference Figure 1 and Figure 2 A platform 5 is provided at the top of the steel pipe sleeve 1. A circular hole 51 is opened on the top surface of the platform 5, which penetrates the platform 5 vertically. The central axis of the circular hole 51 is collinear with the central axis of the steel pipe sleeve 1. The platform 5 is fixed to the ground at the top of the dewatering well. A water pump 6 is fixed to the top surface of the platform 5. A water pump pipe 61 is fixedly connected to the inlet of the water pump 6. The end of the water pump pipe 61 away from the water pump 6 is inserted into the steel pipe sleeve 1. A water outlet pipe 62 is fixedly connected to the outlet of the water pump 6.

[0044] The top of the push rod 14 passes through the water inlet hole 22, causing the push rod 14 to push the sealing ball 25 upward, causing the sealing ball 25 to disengage from the water inlet hole 22, thereby allowing the water in the dewatering well to flow out through the water inlet hole 22, the annular cavity 21 and the water outlet hole 23. When it is necessary to extract water from the dewatering well for use, the water pump 6 is started. The water pump 6 extracts the water from the steel pipe sleeve 1 through the water pumping pipe, and then discharges it through the water outlet pipe 62, thereby extracting the water from the dewatering well for use.

[0045] Reference Figure 3Two through holes 31 are formed on the inner circumferential surface of the annular groove 11. The two through holes 31 are symmetrically arranged along the central axis of the steel pipe sleeve 1. Two grooves 3 are formed on the outer circumferential surface of the movable block 2, corresponding to the two through holes 31. The inner surface of the groove 3 near the central axis of the movable block 2 is a slope 32. The distance from the top of the slope 32 to the central axis of the movable block 2 is less than the distance from the bottom of the slope 32 to the central axis of the movable block 2. A rod 33 is slidably arranged in the groove 3. The end of the rod 33 away from the central axis of the movable block 2 is inserted into the through hole 31. The end of the rod 33 away from the central axis of the movable block 2 is a pointed tip. The end face of the rod 33 near the central axis of the movable block 2 is a spherical surface. A limiting block 34 is fixedly fitted on the outer circumferential surface of the rod 33. The two end faces of the limiting block 34 are in contact with the opposite inner surfaces of the groove 3. A second spring 35 is fitted on the outer circumferential surface of the insertion rod 33. One end of the second spring 35 is fixedly connected to the inner circumferential surface of the annular groove 11, and the other end of the second spring 35 is fixedly connected to the side of the limiting block 34 away from the central axis of the moving block 2.

[0046] Reference Figure 2 and Figure 3 A support frame 52 is fixed to the top surface of platform 5, and a support plate 521 is fixed to the top of the support frame 52. The support plate 521 is parallel to platform 5. A through hole 53 is opened on the top surface of the support plate 521, and a screw 54 passes through the through hole 53. Two sliders 55 are fixed to the inner circumferential surface of the through hole 53. The two sliders 55 are symmetrically arranged along the central axis of the through hole 53. Two grooves 56 are opened on the outer circumferential surface of the screw 54, and the sliders 55 slide vertically in the grooves 56. A connecting pipe 57 is sleeved on the bottom end of the screw 54. The connecting pipe 57 is rotatably connected to the screw 54. A ring 59 is fixed to the inner circumferential surface of the connecting pipe 57, and the top surface of the ring 59 is coplanar with the top surface of the connecting pipe 57. An annular groove 58 is opened on the outer circumferential surface of the screw 54, and the ring 59 is disposed in the annular groove 58, with the inner circumferential surface of the ring 59 fitting against the inner circumferential surface of the annular groove 58. A stud 28 is fixed to the top surface of the movable block 2. The top end of the stud 28 is inserted into the connecting pipe 57, and the stud 28 is threadedly connected to the connecting pipe 57. A rotating sleeve 72 is fitted on the outer circumferential surface of the screw 54. The rotating sleeve 72 is threadedly connected to the screw 54. The bottom end of the rotating sleeve 72 is rotatably connected to the top surface of the support plate 521. A motor 7 is fixed to the top surface of the support plate 521. A gear 1 71 is fitted and fixed on the output shaft of the motor 7, and a gear 2 73 is fitted and fixed on the rotating sleeve 72. Gear 1 71 and gear 2 73 mesh with each other.

[0047] When it is necessary to seal the dewatering wells inside the deep foundation pit, motor 7 is started. The output shaft of motor 7 drives gear 1 71 to rotate, gear 1 71 drives gear 2 73 to rotate, gear 2 73 drives rotating sleeve 72 to rotate, rotating sleeve 72 drives screw 54 to move upward, screw 54 drives stud 28 to move upward through connecting pipe 57, stud 28 drives moving block 2 to move upward. When moving block 2 moves upward, inclined plane 32 pushes the insertion rod 33 to move away from the central axis of moving block 2, so that the insertion rod 33 passes through... The through hole 31 is inserted into the inner wall of the dewatering well in the deep foundation pit, thereby fixing the steel pipe sleeve 1 inside the dewatering well in the deep foundation pit. At the same time, the top surface of the moving block 2 abuts against the bottom surface of the rubber ring 12, and the top of the top rod 14 disengages from the sealing ball 25. Under the elastic force of the spring 24, the sealing ball 25 moves downward, causing the sealing ball 25 to block the water inlet 22. Then, the connecting pipe 57 is rotated to disengage from the stud 28, the platform 5 is removed, and sand and gravel are filled into the steel pipe sleeve 1, thereby sealing the dewatering well.

[0048] Reference Figure 2 and Figure 4 Two sliding grooves 4 are formed on the inner circumferential surface of the movable block 2, and the two sliding grooves 4 are symmetrically arranged along the central axis of the movable block 2. A fixing block 41 is slidably arranged in the sliding groove 4, and a spring 3 42 is fixed to the side of the fixing block 41 near the central axis of the movable block 2. One end of the spring 3 42 near the central axis of the movable block 2 is fixed to the inner side of the sliding groove 4 near the central axis of the movable block 2. Two mounting grooves 43 are formed on the inner side of the annular groove 11, and the two mounting grooves 43 correspond to the two sliding grooves 4. Multiple positioning blocks 44 are fixed in the mounting grooves 43, and the multiple positioning blocks 44 are arranged at equal intervals along the vertical direction. The end of the fixing block 41 away from the spring 3 42 can be inserted between two adjacent positioning blocks 44. An inclined surface 2 45 is formed on the bottom surface of the positioning block 44, and an inclined surface 3 46 is formed on the top surface of the fixing block 41. The inclined surface 2 45 can abut against the inclined surface 3 46.

[0049] When the moving block 2 moves upward, the inclined plane 3 46 abuts against the inclined plane 2 45. The inclined plane 2 45 pushes the inclined plane 3 46, causing the fixed block 41 to move into the sliding groove 4. The spring 3 42 is in a compressed state. When the top surface of the moving block 2 abuts against the bottom surface of the rubber ring 12, the fixed block 41 moves towards the positioning block 44 under the elastic force of the spring 3 42, so that the fixed block 41 is inserted between two adjacent positioning blocks 44. The bottom surface of the fixed block 41 abuts against the top surface of the positioning block 44, thereby reducing the possibility that the mortar will press the moving block 2 downward when filling the steel pipe sleeve 1 with sand and gravel.

[0050] The implementation principle of the deep foundation pit dewatering well sealing device in this application embodiment is as follows: When it is necessary to seal the dewatering well in the deep foundation pit, the motor 7 is started. The motor 7 drives gear 1 71 to rotate, gear 1 71 drives gear 2 73 to rotate, gear 2 73 drives rotating sleeve 72 to rotate, rotating sleeve 72 drives screw 54 to move upward, screw 54 drives stud 28 to move upward through connecting pipe 57, stud 28 drives moving block 2 to move upward, so that top rod 14 disengages from sealing ball 25, sealing ball 2... 5. Under the elastic force of spring 24, it moves downward, so that the sealing ball 25 seals the water inlet 22. At the same time, the moving block 2 moves upward, and the inclined surface 32 also pushes the insertion rod 33 to move away from the central axis of the moving block 2, so that the insertion rod 33 passes through the through hole 31 and is inserted into the inner wall of the dewatering well in the deep foundation pit, thereby fixing the steel pipe sleeve 1 in the dewatering well. This reduces the possibility that when the dewatering well is blocked, the water pressure in the dewatering well is too high and the water flow impacts the moving block 2, causing the steel pipe sleeve 1 to be flushed out of the dewatering well.

[0051] As the movable block 2 moves upward, the second inclined plane 45 pushes the third inclined plane 46, causing the fixed block 41 to move towards the sliding groove 4. The third spring 42 is in a compressed state. When the top surface of the movable block 2 abuts against the bottom surface of the rubber ring 12, the third inclined plane 46 disengages from the second inclined plane 45. Under the elastic force of the third spring 42, the fixed block 41 moves between the two adjacent positioning blocks 44, and the bottom surface of the fixed block 41 abuts against the top surface of the positioning block 44, thereby fixing the movable block 2 inside the steel pipe sleeve 1. Then, the connecting pipe 57 is rotated to disengage from the stud 28, the platform 5 is removed, and sand and gravel are filled into the steel pipe sleeve 1, thereby sealing the dewatering well in the deep foundation pit.

[0052] This application also discloses a method for sealing dewatering wells in deep foundation pits, including the following steps:

[0053] S1: When it is necessary to seal the dewatering well, fix the platform 5 at the wellhead of the dewatering well, insert the top of the stud 28 into the connecting pipe 57, rotate the connecting pipe 57 to screw the stud 28 into the connecting pipe 57, and connect the stud 28 and the screw 54 through the connecting pipe 57.

[0054] S2: Start motor 7. Motor 7 drives gear 1 71 to rotate. Gear 1 71 drives gear 2 73 to rotate. Gear 2 73 drives rotating sleeve 72 to rotate. Rotating sleeve 72 drives screw 54 to move upward. Screw 54 drives stud 28 to move upward through connecting pipe 57. Stud 28 drives moving block 2 to move upward. This causes push rod 14 to disengage from water inlet hole 22. Sealing ball 25 moves downward under the elastic force of spring 1 24, blocking water inlet hole 22.

[0055] S3: When the moving block 2 moves upward, the inclined plane 32 pushes the insertion rod 33 to move away from the central axis of the moving block 2, so that the insertion rod 33 passes through the through hole 31 and is inserted into the wall of the dewatering well, thereby fixing the steel pipe sleeve 1 into the dewatering well.

[0056] S4: Finally, rotate the connecting pipe 57 to disengage it from the stud 28, remove the platform 5, and fill the steel pipe sleeve 1 with sand and gravel to complete the sealing of the dewatering well in the deep foundation pit.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing device for dewatering wells in deep foundation pits, comprising a steel pipe sleeve (1) installed inside the dewatering well, characterized in that: A movable block (2) is provided inside the steel pipe sleeve (1). An annular cavity (21) is formed inside the movable block (2). A water outlet (23) is formed on the inner top surface of the annular cavity (21). A water inlet (22) is formed on the inner bottom surface of the annular cavity (21). A spring (24) is fixed on the inner top surface of the annular cavity (21). A sealing ball (25) for sealing the water inlet (22) is fixed at the bottom end of the spring (24). A fixing plate (13) is fixed inside the steel pipe sleeve (1). The fixed plate (13) is located below the movable block (2). A top rod (14) is fixed on the top surface of the fixed plate (13). The top end of the top rod (14) passes through the water inlet (22) and abuts against the outer circumferential surface of the sealing ball (25). A driving mechanism for driving the movable block (2) to move vertically is provided on the steel pipe sleeve (1). A fixing mechanism for fixing the steel pipe sleeve (1) in the dewatering well is provided on the steel pipe sleeve (1). The steel pipe sleeve (1) has an annular groove (11) on its inner circumferential surface. The outer circumferential surface of the moving block (2) is in contact with the inner circumferential surface of the annular groove (11). A rubber ring (12) is fixed to the inner top surface of the annular groove (11). The bottom surface of the rubber ring (12) can abut against the top surface of the moving block (2). The inner circumferential surface of the annular groove (11) has multiple through holes (31). The outer circumferential surface of the moving block (2) has multiple through holes (31) that intersect with the through holes (31). The corresponding groove (3) includes a rod (33) disposed in the groove (3). The end of the rod (33) away from the moving block (2) is inserted into the through hole (31). The side of the groove (3) near the central axis of the moving block (2) is a slope (32). The distance between the top of the slope (32) and the central axis of the moving block (2) is less than the distance between the bottom of the slope (32) and the central axis of the moving block (2).

2. The device for sealing dewatering wells in deep foundation pits according to claim 1, characterized in that: A limiting block (34) is provided on the outer peripheral surface of the insertion rod (33), and a second spring (35) is provided on the periphery of the insertion rod (33). One end of the second spring (35) is fixedly connected to the inner wall of the annular groove (11), and the other end of the second spring (35) is fixedly connected to the side of the limiting block (34) away from the central axis of the moving block (2).

3. The device for sealing dewatering wells in deep foundation pits according to claim 1, characterized in that: The outer peripheral surface of the movable block (2) is provided with a sliding groove (4), and a fixed block (41) is slidably disposed in the sliding groove (4). A spring (42) is fixed on the side of the fixed block (41) near the central axis of the movable block (2). One end of the spring (42) away from the fixed block (41) is fixed to the inner side of the sliding groove (4) near the central axis of the movable block (2). The inner peripheral surface of the annular groove (11) is provided with an installation groove (43) corresponding to the sliding groove (4). A plurality of positioning blocks (44) are fixed in the installation groove (43). One end of the fixed block (41) away from the spring (42) can be inserted between two adjacent positioning blocks (44). The bottom surface of the positioning block (44) is provided with a slope (45), and the top surface of the fixed block (41) is provided with a slope (46). The slope (45) can abut against the slope (46).

4. The device for sealing dewatering wells in deep foundation pits according to claim 1, characterized in that: The driving mechanism includes a stud (28) fixed to the top surface of the movable block (2). A platform (5) is provided at the top of the steel pipe sleeve (1). The platform (5) is fixed to the ground. A circular hole (51) is opened on the top surface of the platform (5). A support frame (52) is fixed on the platform (5). A support plate (521) is fixed on the support frame (52). A through hole (53) is opened on the top surface of the support plate (521). A screw rod passes through the through hole (53). (54) The screw (54) is slidably connected to the support plate (521) in the vertical direction. A connecting tube (57) is sleeved on the bottom end of the screw (54). The connecting tube (57) is rotatably connected to the screw (54). The top end of the stud (28) is inserted into the connecting tube (57). The stud (28) is threadedly connected to the connecting tube (57). A driving assembly for driving the screw (54) to move vertically is provided on the support plate (521).

5. The device for sealing dewatering wells in deep foundation pits according to claim 4, characterized in that: The drive assembly includes a rotating sleeve (72) sleeved on the screw (54), the rotating sleeve (72) being threadedly connected to the screw (54), the bottom end of the rotating sleeve (72) being rotatably connected to the top surface of the support plate (521), a motor (7) being fixed on the top surface of the support plate (521), a gear one (71) being provided on the output shaft of the motor (7), a gear two (73) being provided on the rotating sleeve (72), and the gear one (71) meshing with the gear two (73).

6. The sealing device for dewatering wells in deep foundation pits according to claim 4, characterized in that: The inner circumferential surface of the connecting pipe (57) is fixed with a ring (59), and the outer circumferential surface of the screw (54) is provided with an annular groove (58), and the ring (59) is disposed in the annular groove (58).

7. The device for sealing dewatering wells in deep foundation pits according to claim 4, characterized in that: The outer peripheral surface of the screw (54) is provided with a groove (56), and the inner peripheral surface of the through hole (53) is provided with a slider (55). The slider (55) is slidably disposed in the groove (56) in the vertical direction.

8. A method for sealing dewatering wells inside deep foundation pits, comprising a sealing device for dewatering wells inside deep foundation pits according to claim 5, characterized in that... Includes the following steps: S1: When it is necessary to seal the dewatering well, fix the platform (5) at the wellhead of the dewatering well, insert the top of the stud (28) into the connecting pipe (57), rotate the connecting pipe (57) to screw the stud (28) into the connecting pipe (57), and connect the stud (28) and the screw (54) through the connecting pipe (57); S2: Start the motor (7), the motor (7) drives gear one (71) to rotate, gear one (71) drives gear two (73) to rotate, gear two (73) drives the rotating sleeve (72) to rotate, the rotating sleeve (72) drives the screw (54) to move upward, the screw (54) drives the stud (28) to move upward through the connecting pipe (57), so that the stud (28) drives the moving block (2) to move upward, so that the top rod (14) disengages from the water inlet hole (22), and the sealing ball (25) moves downward under the elastic force of spring one (24) to block the water inlet hole (22); S3: When the moving block (2) moves upward, the inclined plane (32) pushes the insert rod (33) to move away from the central axis of the moving block (2), so that the insert rod (33) passes through the through hole (31) and is inserted into the wall of the dewatering well, thereby fixing the steel pipe sleeve (1) in the dewatering well; S4: Finally, rotate the connecting pipe (57) to disengage the connecting pipe (57) from the stud (28), remove the platform (5), and fill the steel pipe sleeve (1) with sand and gravel to complete the sealing of the dewatering well in the deep foundation pit.

Images