River and sea facies oversized foundation pit pressure reduction well plugging device and construction method

Abstract

The invention discloses a river-sea facies oversized foundation pit depressurization well plugging device and a construction method, and relates to the technical field of dewatering well construction, the river-sea facies oversized foundation pit depressurization well plugging device comprises a foundation pit, a concrete stratum covering the surface of the foundation pit, a dewatering well installed below the foundation pit and a plugging block capable of being inserted into the dewatering well, and a connecting rod is arranged on one side of the plugging block; a fixing frame is arranged outside the dewatering well, a transmission hole is formed in the fixing frame, a transmission device is arranged on the side, away from the dewatering well, of the transmission hole, a transmission rod is arranged on the transmission device, and the transmission rod penetrates through the transmission hole to be connected with a connecting rod; a plurality of sliding grooves are formed in the inner side wall of the dewatering well, positioning grooves are formed in the ends, away from the outer side of the dewatering pipe, of the sliding grooves, the plugging block is provided with a plurality of positioning mechanisms, the plugging block is pushed through the transmission device to conduct preliminary plugging, underground water is prevented from gushing outwards, and then concrete is used for plugging.

Description

Technical Field

[0001] The present application relates to the technical field of dewatering well construction, and in particular to a plugging device and construction method for a dewatering well in a river-sea super-large foundation pit. Background Art

[0002] When underground construction is carried out in river-sea areas, the foundation pit under construction needs to be dewatered, usually using multiple dewatering wells and pumps to lower the water level; after the bottom floor of the building is completed, the dewatering wells must be sealed, usually by directly filling them with concrete to prevent water from overflowing from the dewatering wells.

[0003] Regarding the above-mentioned related technologies, when the precipitation wells are blocked one by one, due to the high water level in the river-sea area, the water pressure in the last few precipitation wells will be concentrated, causing a large amount of groundwater to gush out. The groundwater with a water level that is too high will affect the solidification of concrete, making it difficult to directly use concrete to block it. Summary of the invention

[0004] The first purpose of the present application is to provide a sealing device for a depressurization well in a river-sea super-large foundation pit, so as to improve the problem that dewatering wells with relatively high pressure groundwater are difficult to seal.

[0005] The present application provides a plugging device and construction method for a super-large river-sea foundation pit pressure-reducing well, which adopts the following technical solutions: A pressure-reducing well sealing device for a river-sea super-large foundation pit comprises a foundation pit, a concrete stratum covering the surface of the foundation pit, a dewatering well installed below the foundation pit, and a sealing block that can be inserted into the dewatering well, wherein a connecting rod is arranged above the sealing block; a fixing frame is arranged outside the dewatering well, wherein the fixing frame is provided with a transmission hole, a transmission device is arranged on a side of the transmission hole away from the dewatering well, wherein the transmission device is provided with a transmission rod, and the transmission rod passes through the transmission hole and is connected with the connecting rod; a plurality of sliding grooves are arranged on an inner side wall of the dewatering well, a positioning groove is arranged on the bottom wall of the sliding groove, and a plurality of positioning mechanisms are arranged on the sealing block.

[0006] By adopting the above technical scheme, since the water pressure in the precipitation well is high and concrete cannot be directly filled for sealing, a sealing block is used to prevent groundwater from overflowing, and a connecting rod is arranged on the sealing block, so that the sealing block can be pressed into the precipitation well through the connecting rod; a fixing frame is arranged on the outside of the precipitation well, and a transmission hole is arranged on the fixing frame. At the same time, a transmission device is arranged on the side of the transmission hole away from the precipitation well, and a transmission rod is arranged on the transmission device, and the transmission rod passes through the transmission hole and is connected and fixed with the connecting rod. At this time, the transmission device can be used to push the sealing block into the precipitation well; a plurality of sliding grooves are arranged on the inner wall of the precipitation well, and a positioning groove is arranged at the end of the sliding groove away from the outside of the precipitation well. At the same time, a plurality of positioning mechanisms are arranged in the sealing block corresponding to the sliding groove. When the sealing block is placed in the precipitation well, the positioning mechanism is pushed into the precipitation well corresponding to the sliding groove and positioned at the positioning groove, so that the sealing block can prevent groundwater from overflowing, and then concrete is filled into the precipitation well for thorough sealing. The sealing block can prevent the overflowed groundwater from affecting the solidification of the concrete.

[0007] Preferably, the positioning mechanism includes a positioning pin and an elastic member, the outer wall of the blocking block is provided with a mounting hole, the positioning pin can be inserted into the mounting hole, a movable groove is provided on the surface of the blocking block, the movable groove is communicated with the mounting hole, a lever is provided on the side of the positioning pin close to the movable groove, the lever passes through the movable groove and extends to the outside of the blocking block; one end of the elastic member abuts against the positioning pin, and the other end abuts against the side wall of the mounting hole.

[0008] By adopting the above technical scheme, the positioning mechanism includes a positioning pin and an elastic member. An installation hole for inserting the positioning pin is provided on the outer wall of the blocking block, and a movable groove is provided on the surface of the blocking block, and the movable groove is communicated with the installation hole; a lever is provided on the positioning pin, and the lever extends to the outside of the blocking block through the movable groove. At this time, the movement of the positioning pin can be controlled by toggling the lever; one end of the elastic member is against the positioning pin, and the other end is against the inner wall of the installation groove. The elastic force of the elastic member is used to push the positioning pin toward the outside of the installation groove, so that the positioning pin can be pressed against the sliding groove, and when moved to the positioning groove, the positioning pin can be inserted into the positioning groove, thereby fixing the blocking block.

[0009] Preferably, a connecting tube is sleeved on the connecting rod, and a plurality of connecting ropes are arranged on the outer side wall of the connecting tube corresponding to the shifting rod, and one end of the connecting rope is connected to the shifting rod.

[0010] By adopting the above technical solution, a connecting tube is installed on the connecting rod, and a plurality of connecting ropes are provided on the outer wall of the connecting tube corresponding to the lever. At the same time, the other end of the connecting rope is connected to the lever. At this time, moving the connecting tube will drive the connecting rope to pull the lever to move, so that multiple levers can be moved synchronously, and then the positioning pins can be synchronously retracted into the installation groove, which facilitates the installation of the blocking block into the precipitation well and improves the installation efficiency of the blocking block.

[0011] Preferably, a magnetic member that is magnetically attracted to the positioning pin is provided in the positioning groove.

[0012] By adopting the above technical solution, a magnetic member is installed in the positioning groove, and the positioning pin can be adsorbed by the magnetic member, thereby improving the installation efficiency of the positioning pin and making the positioning pin more firmly inserted into the positioning groove.

[0013] Preferably, a pumping device is provided outside the precipitation well, the pumping device is provided with a pumping pipe, the blocking block is provided with a pumping hole for the pumping pipe to pass through, and a submersible pump is provided at one end of the pumping pipe located in the precipitation well.

[0014] By adopting the above technical solution, a pumping device is installed outside the precipitation well, a pumping pipe is installed on the pumping device, and a pumping hole for the pumping pipe to pass through is provided on the blocking block, and a submersible pump is provided at one end of the pumping pipe located in the precipitation well. At this time, the pumping device is used in conjunction with the submersible pump to pump out the groundwater in the precipitation well, thereby reducing the water pressure in the precipitation well, and thus facilitating the insertion of the blocking block in the precipitation well; at the same time, pumping can continue after the blocking is completed to lower the water level.

[0015] Preferably, the inner wall of the water pumping hole is provided with fixing grooves at both upper and lower ends, and the fixing grooves are provided with sealing soft rings.

[0016] By adopting the above technical solution, sealing soft rings are installed at the upper and lower ends of the inner wall of the pumping hole through fixed grooves, and the sealing soft rings are used to fit the pumping pipe, thereby reducing groundwater overflowing from the pumping hole and reducing the impact of groundwater on concrete.

[0017] Preferably, a connecting threaded hole is provided at the location where the blocking block is in contact with the connecting rod, and a threaded end is provided at one end of the connecting rod close to the blocking block, and the threaded end of the connecting rod can be threadedly connected to the connecting threaded hole.

[0018] By adopting the above technical solution, a threaded connection is used between the blocking block and the connecting rod. After the blocking block is fixed in the positioning groove, the connecting rod can be taken out by rotating the connecting rod. There is no need to seal the connecting rod in the precipitation well. At the same time, the connecting rod can be recycled and reused, saving materials.

[0019] Preferably, a connecting pipe is provided on a side of the fixing frame away from the transmission device, the connecting pipe is communicated with the transmission hole, and the connecting rod can be inserted into the connecting pipe.

[0020] By adopting the above technical solution, a connecting pipe is provided on the side of the fixing frame away from the transmission device, and the connecting rod is inserted into the connecting pipe. When the blocking block is installed, the connecting rod is moved along the connecting pipe, thereby making the movement of the connecting rod more stable.

[0021] The second purpose of the present application is to provide a construction method for a river-sea super-large foundation pit depressurization well plugging device to improve the problem that dewatering wells with relatively high pressure groundwater are difficult to plug.

[0022] A construction method for a plugging device for a river-sea super-large foundation pit pressure-reducing well: Preferably, S100, a fixing frame is provided outside the precipitation well, a transmission hole is provided on the fixing frame, and a transmission device is provided on a side of the transmission hole away from the precipitation well; S200, a transmission rod is provided on the transmission device, a connecting rod is connected to the end of the transmission rod away from the transmission device, and a blocking block is installed on the end of the connecting rod away from the transmission rod; a plurality of sliding grooves are provided on the inner side wall of the precipitation well, a positioning groove is provided at the end of the sliding groove away from the outer side of the precipitation well, and a plurality of positioning mechanisms are provided on the blocking block corresponding to the sliding grooves; a connecting pipe is provided on the side of the transmission hole away from the transmission device, and the connecting rod can be inserted into the connecting pipe and connected with the transmission rod; S300, a pumping device is arranged outside the precipitation well, a pumping pipe is installed on the pumping device, a pumping hole for the pumping pipe to pass through is arranged on the blocking block, and a submersible pump is installed at one end of the pumping pipe located at the precipitation well; S400, insert the blocking block into the dewatering well along the sliding groove using the blocking block positioning mechanism, and start the pumping device at the same time; after the blocking block is fixed at the positioning groove, fill the dewatering well with concrete for blocking.

[0023] By adopting the above technical scheme, a blocking block is placed in a precipitation well to block the outflow of groundwater. A fixed frame is installed on the outside of the precipitation well, and a transmission device is installed on the fixed frame, and a transmission rod is installed on the transmission device. A connecting rod is installed on the blocking block, and the transmission rod is connected to the connecting rod. The blocking block is inserted into the precipitation well through the transmission device. A connecting pipe is provided on the fixed frame, and the connecting pipe can be used for the connecting rod to be inserted. The connecting rod can move along the connecting pipe, thereby improving the stability of the installation of the blocking block; a sliding groove is provided on the inner wall of the precipitation well, and a positioning groove is provided in the sliding groove. A positioning mechanism is provided in the blocking block, and the blocking block is fixed in the precipitation well by the positioning mechanism and the positioning groove; a pumping device is installed outside the precipitation well, a pumping pipe is installed on the pumping device, a pumping hole for the pumping pipe to pass through is provided on the blocking block, a submersible pump is provided at one end of the pumping pipe located in the precipitation well, and the pumping device and the submersible pump are used to pump out the groundwater in the precipitation well, thereby reducing the resistance when installing the blocking block and improving the installation efficiency and stability; after the blocking block is installed to block the groundwater, concrete is filled for sealing to prevent the concrete from being affected by the groundwater and unable to solidify.

[0024] Preferably, S210, the positioning mechanism includes a positioning pin and an elastic member, an outer wall of the blocking block is provided with a mounting hole for inserting the positioning pin, and a movable groove is provided on the surface of the blocking block, the movable groove is communicated with the mounting hole; a lever is provided on the side of the positioning pin close to the movable groove, the lever passes through the movable groove and extends to the outside of the blocking block; one end of the elastic member abuts against the positioning pin, and the other end abuts against the inner wall of the mounting groove; S211, a connecting tube is provided on the connecting rod, and a plurality of connecting ropes are provided on the outer wall of the connecting tube corresponding to the shifting rod, and one end of the connecting rope is connected to the shifting rod; S220, a magnetic member magnetically attracted to the positioning pin is installed in the positioning groove; S230, a connecting threaded hole is provided on one side of the blocking block that is in contact with the connecting rod, a threaded end is provided on one end of the connecting rod that is close to the blocking block, and the blocking block and the connecting rod are connected through the connecting threaded hole and the threaded end; S310, fixing grooves are provided at both upper and lower ends of the inner wall of the water pumping hole, and sealing soft rings are installed in the fixing grooves.

[0025] By adopting the above technical scheme, the positioning mechanism includes a positioning pin and an elastic member. When installing the blocking block, the positioning pin is aligned with the sliding groove, and the positioning pin is slid into the positioning groove at the same time. The elastic force of the elastic member is used to insert the positioning pin into the positioning groove, so that the blocking block can be stably and firmly installed in the precipitation well during installation; the connecting rope is synchronously controlled by a connecting tube to achieve simultaneous pulling of multiple levers, thereby controlling the synchronous movement of multiple positioning pins and improving the installation efficiency of the blocking block; a magnetic member is installed in the positioning groove, and the magnetic force of the magnetic member is used to absorb the positioning pin to improve the installation speed and stability of the blocking block; a sealing soft ring is used to fit the pumping pipe for installation to prevent groundwater from overflowing from the pumping hole and affecting the solidification of concrete.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. A fixing frame is arranged outside the precipitation well, and a transmission device is installed on the fixing frame. The transmission device is connected with a blocking block. The blocking block is inserted into the precipitation well by using the transmission device, so that the blocking block can achieve the function of blocking the overflow of groundwater, and then the concrete is sealed to prevent the groundwater from affecting the solidification of concrete; 2. A positioning mechanism is installed in the blocking block, a sliding groove is provided on the inner wall of the precipitation well, and a positioning groove is provided in the sliding groove. The positioning mechanism includes a positioning pin and an elastic member. The positioning pin is pressed tightly in the positioning groove by the elastic force of the elastic member, thereby fixing the blocking block in the precipitation well; 3. A pumping device is installed on the outside of the precipitation well, and a pumping pipe is installed on the pumping device. At the same time, a pumping hole for the pumping pipe to pass through is provided on the blocking block. A submersible pump is installed at one end of the pumping pipe located in the precipitation well. When installing the blocking block, the pumping device and the submersible pump are used to pump out the groundwater in the precipitation well, thereby reducing the resistance when installing the blocking block and increasing the installation efficiency and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a river-sea super-large foundation pit pressure reduction well plugging device according to the present application.

[0028] Figure 2 It is a cross-sectional schematic diagram for showing the internal structure of the blocking block in the embodiment.

[0029] Figure 3 yes Figure 2 Enlarged view of part A in .

[0030] Figure 4 yes Figure 2 Enlarged view of part B in .

[0031] In the figure, 1, foundation pit; 2, concrete stratum; 3, blocking block; 31, connecting rod; 311, threaded end; 32, mounting hole; 33, movable groove; 34, pumping hole; 341, fixed groove; 342, sealing soft ring; 35, connecting threaded hole; 4, dewatering well; 41, sliding groove; 411, positioning groove; 412, magnetic part; 5, fixing frame; 51, transmission hole; 52, connecting pipe; 6, transmission device; 61, transmission rod; 7, positioning mechanism; 71, positioning pin; 711, lever; 72, elastic part; 8, connecting tube; 81, connecting rope; 9, pumping device; 91, pumping pipe; 92, submersible pump. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 -Attached Figure 4 , further details of this application are given.

[0033] Embodiment 1: A plugging device for a pressure-reducing well in a river-sea super-large foundation pit, referring to Figure 1, including a foundation pit 1, a concrete stratum 2 covering the upper surface of the foundation pit 1, a dewatering well 4 installed in the stratum below the foundation pit 1, and a blocking block 3 is used in the dewatering well 4 to prevent groundwater from overflowing; a connecting rod 31 is installed on the blocking block 3, a fixing frame 5 is arranged outside the dewatering well 4, and a transmission hole 51 is arranged on the fixing frame 5, and a transmission device 6 is installed on the side of the transmission hole 51 away from the dewatering well 4, the transmission device 6 is a hydraulic cylinder, and a transmission rod 61 is installed on the transmission device 6, The transmission rod 61 passes through the transmission hole 51 and is connected to the connecting rod 31. The transmission device 6 is used to press the blocking block 3 into the dewatering well 4, which is more stable than manual pressing. At the same time, four sliding grooves 41 are arranged on the inner wall of the dewatering well 4, and a positioning groove 411 is arranged at one end of the sliding groove 41 away from the outer side of the dewatering well 4. Four positioning mechanisms 7 are installed in the blocking block 3 corresponding to the sliding groove 41. The positioning mechanism 7 is inserted into the positioning groove 411 along the sliding groove 41 to complete the positioning and fixation of the blocking block 3.

[0034] Reference Figure 2 and Figure 3 The positioning mechanism 7 includes a positioning pin 71 and an elastic member 72. A mounting hole 32 for inserting the positioning pin 71 is provided in the blocking block 3, and a movable groove 33 is provided on the surface of the blocking block 3. The movable groove 33 is communicated with the mounting hole 32. A lever 711 is provided on the positioning pin 71. The lever 711 extends to the outside of the blocking block 3 through the movable groove 33. At this time, the lever 711 can be used to control the movement of the positioning pin 71. The elastic member 72 is a spring. One end of the elastic member 72 is against the positioning pin 71, and the other end is against the mounting The inner walls of the hole 32 are abutted against each other, and the elastic force of the elastic member 72 is used to push the positioning pin 71 to the outside of the mounting hole 32, so that the positioning pin 71 can be tightly pressed against the positioning groove 411 to complete the fixation of the blocking block 3; a magnetic member 412 is installed in the positioning groove 411, and the magnetic member 412 is a magnet. The magnetic force of the magnetic member 412 can adsorb the positioning pin 71 inserted into the positioning groove 411, which can improve the installation efficiency of the blocking block 3, and at the same time can also improve the stability of the positioning pin 71 inserted into the positioning groove 411.

[0035] Reference Figure 3 A connecting tube 8 is installed on the connecting rod 31, and four connecting ropes 81 are arranged on the outer wall of the connecting tube 8, and one end of the connecting rope 81 is connected to the lever 711. At this time, the connecting tube 8 can be moved to pull the lever 711 through the connecting rope 81, so as to move the four levers 711 at the same time, thereby synchronously collecting the four positioning pins 71, making it convenient to insert the blocking block 3 into the precipitation well 4, thereby improving the installation efficiency of the blocking block 3.

[0036] Reference Figure 2A pumping device 9 is arranged on the outside of the precipitation well 4. The pumping device 9 is a pumping machine, and a pumping pipe 91 is installed on the pumping device 9, and a submersible pump 92 is installed at one end of the pumping pipe 91 located in the precipitation well 4. At the same time, a pumping hole 34 for the pumping pipe 91 to pass through is arranged in the blocking block 3. At this time, during the installation of the blocking block 3, the pumping device 9 and the submersible pump 92 are used to pump out the groundwater, which can reduce the resistance during installation, thereby improving the installation efficiency of the blocking block 3; at the same time, fixed grooves 341 are arranged at the upper and lower ends of the inner wall of the pumping hole 34, and a sealing soft ring 342 is installed in the fixing groove 341. The material of the sealing soft ring 342 is rubber. The sealing soft ring 342 is fitted with the pumping pipe 91 to prevent groundwater from overflowing from the pumping hole 34; and after the blocking is completed, the pumping device 9 and the submersible pump 92 can be used to reduce the water pressure and water level in the precipitation well 4.

[0037] Reference Figure 2 A connecting tube 8 is provided on the side of the transmission hole 51 away from the transmission device 6, and the connecting tube 8 can be used for the connecting rod 31 to be inserted, so that the blocking block 3 can move along the connecting tube 8 during installation, thereby making the movement of the blocking block 3 more stable; a connecting threaded hole 35 is provided on the side of the blocking block 3 that is close to the connecting rod 31, and a threaded end 311 is provided at one end of the connecting rod 31 close to the blocking block 3, and the blocking block 3 and the connecting rod 31 are installed by matching the threaded end 311 with the connecting threaded hole 35. At this time, after the blocking block 3 is fixed in the dewatering well 4, the connecting rod 31 can be screwed out of the blocking block 3, which is convenient for recovering the connecting rod 31, and there is no need to seal the connecting rod 31 in the dewatering well 4 together.

[0038] The implementation principle of the embodiment of the present application is: The blocking block 3 is installed in the precipitation well 4 to block the overflow of groundwater and prevent the groundwater from affecting the solidification of concrete during the plugging; a fixing frame 5 is arranged on the outside of the precipitation well 4, and a transmission device 6 is installed on the fixing frame 5, and the blocking block 3 is pressed into the precipitation well 4 through the transmission device 6; a connecting tube 8 is also arranged on the fixing frame 5, so that the blocking block 3 moves along the connecting tube 8, so that the installation of the blocking block 3 is more stable; at the same time, four sliding grooves 41 are arranged on the inner wall of the precipitation well 4, and a positioning groove 411 is arranged in the sliding groove 41, and four positioning mechanisms 7 are installed on the blocking block 3, and the positioning mechanism 7 cooperates with the sliding groove 41, and the positioning pin 71 is pressed tightly in the positioning groove 411 to achieve the fixation of the blocking block 3; after fixing the blocking block 3, the threaded connecting rod 31 can be screwed out to facilitate the recovery of the connecting rod 31.

[0039] A pumping device 9 is provided on the outside of the precipitation well 4, and a pumping pipe 91 is installed on the pumping device 9. At the same time, a pumping hole 34 for the pumping pipe 91 to pass through is provided in the blocking block 3. A submersible pump 92 is installed at one end of the pumping pipe 91 located in the precipitation well 4. At this time, the pumping device 9 and the submersible pump 92 are used to pump groundwater out of the precipitation pit to reduce the resistance of groundwater in the precipitation well 4 and facilitate the installation of the blocking block 3.

[0040] Embodiment 2: A construction method for a plugging device for a river-sea super-large foundation pit pressure-reducing well: S100, a fixing frame 5 is arranged outside the precipitation well 4, a transmission hole 51 is arranged on the fixing frame 5, and a transmission device 6 is arranged on a side of the transmission hole 51 away from the precipitation well 4; S200, a transmission rod 61 is provided on the transmission device 6, a connecting rod 31 is connected to the end of the transmission rod 61 away from the transmission device 6, and a blocking block 3 is installed on the end of the connecting rod 31 away from the transmission rod 61; a plurality of sliding grooves 41 are provided on the inner side wall of the precipitation well 4, a positioning groove 411 is provided at the end of the sliding groove 41 away from the outer side of the precipitation well 4, and a plurality of positioning mechanisms 7 are provided on the blocking block 3 corresponding to the sliding grooves 41; a connecting pipe 52 is provided on the side of the transmission hole 51 away from the transmission device 6, and the connecting rod 31 can be inserted into the connecting pipe 52 and connected to the transmission rod 61; S210, the positioning mechanism 7 includes a positioning pin 71 and an elastic member 72. The outer wall of the blocking block 3 is provided with a mounting hole 32 for inserting the positioning pin 71. At the same time, a movable groove 33 is provided on the surface of the blocking block 3, and the movable groove 33 is communicated with the mounting hole 32. A lever 711 is provided on the side of the positioning pin 71 close to the movable groove 33, and the lever 711 passes through the movable groove 33 and extends to the outside of the blocking block 3. One end of the elastic member 72 abuts against the positioning pin 71, and the other end abuts against the inner wall of the mounting groove. S211, a connecting tube 8 is provided on the connecting rod 31, and a plurality of connecting ropes 81 are provided on the outer wall of the connecting tube 8 corresponding to the lever 711, and one end of the connecting rope 81 is connected to the lever 711; S220, a magnetic member 412 magnetically attracted to the positioning pin 71 is installed in the positioning groove 411; S230, a connecting threaded hole 35 is provided on one side of the blocking block 3 that is in contact with the connecting rod 31, a threaded end 311 is provided on one end of the connecting rod 31 that is close to the blocking block 3, and the blocking block 3 and the connecting rod 31 are connected to each other through the connecting threaded hole 35 and the threaded end 311; S300, a pumping device 9 is provided outside the precipitation well 4, a pumping pipe 91 is installed on the pumping device 9, and a pumping hole 34 for the pumping pipe 91 to pass through is provided on the blocking block 3, and a submersible pump 92 is installed at one end of the pumping pipe 91 located at the precipitation well 4; S310, fixing grooves 341 are provided on both sides of the water pumping hole 34, and sealing soft rings 342 are installed in the fixing grooves 341; S400, the positioning mechanism 7 of the blocking block 3 is inserted into the dewatering well 4 along the sliding groove 41, and the pumping device 9 is started at the same time; after the blocking block 3 is fixed at the positioning groove 411, the dewatering well 4 is filled with concrete for blocking.

[0041] The implementation principle of the embodiment of the present application is: Since the groundwater level in the river-sea area is relatively high and the groundwater pressure in the precipitation well 4 is relatively large, the concrete used for plugging is difficult to solidify. Therefore, the transmission device 6 is used to press the blocking block 3 into the precipitation well 4 through the connecting rod 31, and the blocking block 3 is used to block the groundwater in the precipitation well 4 to prevent the groundwater from affecting the solidification of the plugging concrete; at the same time, the pumping device 9 and the submersible pump 92 are used to reduce the water pressure of the groundwater in the precipitation pump, which facilitates the installation of the blocking block 3, and can continue to pump water after the plugging work is completed to lower the groundwater level.

[0042] 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 plugging device for a pressure-reducing well in a river-sea super-large foundation pit, characterized in that: The invention comprises a foundation pit (1), a concrete stratum (2) covering the surface of the foundation pit (1), a drainage well (4) installed below the foundation pit (1), and a blocking block (3) which can be inserted into the drainage well (4), wherein a connecting rod (31) is arranged above the blocking block (3); a fixing frame (5) is arranged outside the drainage well (4), wherein the fixing frame (5) is provided with a transmission hole (51), wherein a transmission device (6) is arranged on a side of the transmission hole (51) away from the drainage well (4), wherein the transmission device (6) is provided with a transmission rod (61), wherein the transmission rod (61) passes through the transmission hole (51) and is connected to the connecting rod (31); wherein a plurality of sliding grooves (41) are arranged on the inner side wall of the drainage well (4), wherein a positioning groove (411) is arranged on the bottom wall of the sliding groove (41), and wherein the blocking block (3) is provided with a plurality of positioning mechanisms (7).

2. The device for plugging a depressurization well in a river-sea super-large foundation pit according to claim 1, characterized in that: The positioning mechanism (7) comprises a positioning pin (71) and an elastic member (72); an outer wall of the blocking block (3) is provided with a mounting hole (32); the positioning pin (71) can be inserted into the mounting hole (32); a movable groove (33) is provided on the surface of the blocking block (3); the movable groove (33) is communicated with the mounting hole (32); a lever (711) is provided on one side of the positioning pin (71) close to the movable groove (33); the lever (711) penetrates the movable groove (33) and extends to the outside of the blocking block (3); one end of the elastic member (72) abuts against the positioning pin (71), and the other end abuts against the inner wall of the mounting hole (32).

3. A plugging device for a river-sea super-large foundation pit depressurization well according to claim 2, characterized in that: A connecting tube (8) is sleeved on the connecting rod (31), and a plurality of connecting ropes (81) are arranged on the outer wall of the connecting tube (8) corresponding to the shifting rod (711), and one end of the connecting rope (81) is connected to the shifting rod (711).

4. The plugging device for a river-sea super-large foundation pit depressurization well according to claim 2 is characterized by: A magnetic member (412) that is magnetically attracted to the positioning pin (71) is provided in the positioning groove (411).

5. The device for plugging a depressurization well in a river-sea super-large foundation pit according to claim 1 is characterized in that: A pumping device (9) is provided outside the precipitation well (4), the pumping device (9) is provided with a pumping pipe (91), the blocking block (3) is provided with a pumping hole (34) for the pumping pipe (91) to pass through, and a submersible pump (92) is provided at one end of the pumping pipe (91) located inside the precipitation well (4).

6. The device for plugging a pressure-reducing well in a river-sea super-large foundation pit according to claim 1, characterized in that: The inner wall of the water pumping hole (34) is provided with fixing grooves (341) at both upper and lower ends, and a sealing soft ring (342) is provided in each of the fixing grooves (341).

7. The plugging device for a river-sea super-large foundation pit depressurization well according to claim 1 is characterized by: A connecting threaded hole (35) is provided at a location where the blocking block (3) is in contact with the connecting rod (31); a threaded end (311) is provided at one end of the connecting rod (31) close to the blocking block (3); and the threaded end (311) of the connecting rod (31) can be threadedly connected to the connecting threaded hole (35).

8. The device for plugging a pressure-reducing well in a river-sea super-large foundation pit according to claim 1, characterized in that: A connecting pipe (52) is provided on a side of the fixing frame (5) away from the transmission device (6); the connecting pipe (52) is communicated with the transmission hole (51); and the connecting rod (31) can be inserted into the connecting pipe (52).

9. A construction method for a plugging device for a river-sea super-large foundation pit pressure-reducing well, characterized in that: S100, a fixing frame (5) is arranged outside the precipitation well (4), a transmission hole (51) is arranged on the fixing frame (5), and a transmission device (6) is arranged on a side of the transmission hole (51) away from the precipitation well (4); S200, a transmission rod (61) is provided on the transmission device (6), a connecting rod (31) is connected to one end of the transmission rod (61) away from the transmission device (6), and a blocking block (3) is installed at one end of the connecting rod (31) away from the transmission rod (61); a plurality of sliding grooves (41) are provided on the inner side wall of the precipitation well (4), a positioning groove (411) is provided at one end of the sliding groove (41) away from the outer side of the precipitation well (4), and a plurality of positioning mechanisms (7) are provided on the blocking block (3) corresponding to the sliding grooves (41); a connecting pipe (52) is provided on the side of the transmission hole (51) away from the transmission device (6), and the connecting rod (31) can be inserted into the connecting pipe (52) and connected to the transmission rod (61); S300, a pumping device (9) is arranged outside the precipitation well (4), a pumping pipe (91) is installed on the pumping device (9), a pumping hole (34) for the pumping pipe (91) to pass through is arranged on the blocking block (3), and a submersible pump (92) is installed at one end of the pumping pipe (91) located at the precipitation well (4); S400, using the positioning mechanism (7) of the blocking block (3) to be inserted into the dewatering well (4) along the sliding groove (41), and simultaneously starting the pumping device (9); after the blocking block (3) is fixed at the positioning groove (411), concrete is filled into the dewatering well (4) for blocking.

10. A plugging device for a pressure-reducing well in a river-sea super-large foundation pit according to claim 9, characterized in that: S210, the positioning mechanism (7) comprises a positioning pin (71) and an elastic member (72); the outer wall of the blocking block (3) is provided with a mounting hole (32) for inserting the positioning pin (71); a movable groove (33) is provided on the surface of the blocking block (3); the movable groove (33) is communicated with the mounting hole (32); a lever (711) is provided on the side of the positioning pin (71) close to the movable groove (33); the lever (711) passes through the movable groove (33) and extends to the outside of the blocking block (3); one end of the elastic member (72) abuts against the positioning pin (71), and the other end abuts against the inner wall of the mounting hole (32); S211, a connecting tube (8) is provided on the connecting rod (31), and a plurality of connecting ropes (81) are provided on the outer wall of the connecting tube (8) corresponding to the shifting rod (711), and one end of the connecting rope (81) is connected to the shifting rod (711); S220, a magnetic member (412) magnetically attracted to the positioning pin (71) is installed in the positioning groove (411); S230, a connecting threaded hole (35) is provided on one side of the blocking block (3) that is in contact with the connecting rod (31), a threaded end (311) is provided on one end of the connecting rod (31) that is close to the blocking block (3), and the blocking block (3) and the connecting rod (31) are connected in cooperation through the connecting threaded hole (35) and the threaded end (311); S310, fixing grooves (341) are provided at both upper and lower ends of the inner wall of the water pumping hole (34), and sealing soft rings (342) are installed in the fixing grooves (341).

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