A foundation pit pressure reduction and dewatering device and construction method

Abstract

The invention discloses a foundation pit decompression and dewatering device and a construction method, and relates to the field of foundation pit dewatering. The foundation pit decompression and dewatering device in the invention comprises a foundation pit and a seepage well, each of the seepage wells having a sealing plate fixedly connected at its port, a first control valve installed inside the through hole, a drainage component fixedly installed on the top of each of the seepage wells, a backfill component fixedly installed on the top of each of the seepage wells, and a solidification component slidably installed on the side wall of each of the seepage wells. The invention arranges a solidification component, and uses a moving plate to approach the seepage well under the action of external soil, compress a spring and drive a piston plate to move synchronously, so that a coagulant inside the cavity enters the inside of a communicating cavity along a drainage pipe, and is then discharged through an injection hole, so that the coagulant contacts the moist soil, and the coagulant reacts with the moisture in the soil to accelerate the consolidation process of the soil, thereby improving the stability of the soil layer, so as to improve the bearing effect on the foundation pit.

Description

Technical Field

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

[0002] Foundation pit dewatering refers to the situation where the groundwater level is higher than the excavation bottom surface during foundation pit excavation. Groundwater will continue to seep into the pit. The number of foundation pit projects is also increasing. The scale and depth of the foundation pit have been greatly improved. Various types of geological conditions will be encountered during the foundation pit excavation process.

[0003] For example, a foundation pit dewatering device proposed in the announcement number CN111794257B includes a foundation pit dug on the ground, a plurality of seepage wells dug around the foundation pit, a plurality of seepage wells arranged around the foundation pit, a water collecting pipe inserted in the seepage well, the bottom of the seepage well and the space between the outer circumference of the water collecting pipe and the inner circumference of the seepage well are filled with irregular stones, the bottom of the water collecting pipe is placed on the stones at the bottom of the seepage well, a filter is arranged in the water collecting pipe, a water pump is arranged at the wellhead position at the top of the seepage well, the water pump's water pipe extends into the water collecting pipe, and the water pipe is located above the filter. It has the advantage of minimizing the blockage of the water pump.

[0004] At present, when carrying out precipitation operations, most of the water in the seepage well is pumped out through a pump body. However, since the water contains a large amount of mud, in order to avoid damage to the water pump, it will be filtered through a filter. However, if the mud content is too much, it will cause blockage. If the pore size of the filter is large, it will cause residual mud in the water and cause damage to the pump body. In addition, during the pumping process, the soil at the bottom of the foundation pit will enter the seepage well along with the water, causing soil loss at the bottom of the foundation pit. If the soil loss is too much, it will cause the foundation pit to lose its bearing capacity, which will affect the stability of the foundation pit. Moreover, after the mud is backfilled, since the mud contains water, it has poor firmness and stability, and natural consolidation takes a certain amount of time, which has limitations.

[0005] In view of the above problems, a foundation pit decompression and dewatering device and a construction method are proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a foundation pit pressure reduction and dewatering device and a construction method. By using this device to work, the problem that mud in the water in the above background may cause damage to the pump body, and in addition, with continuous pumping, the soil on the bottom wall of the foundation pit is lost, affecting the bearing capacity, and it takes a certain amount of time for the mud to solidify naturally is solved.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a foundation pit decompression and dewatering device, comprising a foundation pit and a seepage well, wherein the seepage well is fixedly connected to the periphery of the foundation pit, a sealing plate is fixedly connected to the port of each of the seepage wells, a through hole is opened at the top of each of the sealing plates, a first control valve is installed inside the through hole, a drainage component is fixedly installed at the top of each of the seepage wells, a backfill component is fixedly installed at the top of each of the seepage wells, and a solidification component is slidably installed on the side wall of each of the seepage wells;

[0008] The drainage assembly includes a connecting pipe, which is fixedly connected to the bottom wall of the seepage well, the inner wall of the connecting pipe is symmetrically fixedly connected with a mounting ring, two mounting rings are commonly installed with electric spiral blades, the bottom end of the connecting pipe is installed with a first one-way valve, the top end of the connecting pipe is installed with a second one-way valve, the inner wall of the seepage well is provided with a chute, and the top of the foundation pit is fixedly connected with a water pump;

[0009] The input end of the water pump is fixedly connected with a water pump pipe, the water pump pipe is a retractable hose, the output end of the water pump is fixedly connected with a drain pipe, the inner wall of the slide groove is embedded with a floating plate slidably connected, the top of the floating plate is fixedly connected with a first fixed plate, and the top of the first fixed plate is fixedly connected with a first electrode sheet;

[0010] One end of the water pumping pipe passes through the sealing plate and is fixedly connected with the second fixing plate. The inner wall of the water seepage well is fixedly connected with the second fixing plate. The bottom end of the second fixing plate is fixedly connected with the second electrode sheet. The inner wall of the other side of the water seepage well is fixedly connected with a liquid storage tank. The bottom wall of the liquid storage tank is fixedly connected with a liquid outlet pipe. A second control valve is installed inside the liquid outlet pipe.

[0011] The backfill assembly includes an air pump, which is fixedly connected to the top of the foundation pit, an air extraction pipe is fixedly connected to the input end of the air pump, an exhaust pipe is fixedly connected to the output end of the air pump, one end of the exhaust pipe passes through the top wall of the sealing plate and extends to the inside of the seepage well, a plurality of circular holes are symmetrically opened on the inner side wall of the seepage well, a third one-way valve is installed inside each of the circular holes, and a plurality of acoustic wave detectors are symmetrically fixedly connected to the top of the seepage well;

[0012] The solidification component includes a cavity, which is symmetrically opened on the side wall of the seepage well. A movable plate is symmetrically fixedly connected to the side wall of the seepage well. A connecting cavity is opened inside the movable plate. A plurality of injection holes are opened on the side wall of the connecting cavity. A one-way injection valve is installed inside each of the injection holes. A spring is symmetrically fixedly connected to the side wall of the movable plate.

[0013] Furthermore, each of the springs is fixedly connected to the side wall of the seepage well, the side wall of the movable plate is symmetrically provided with wedge-shaped holes, each of the wedge-shaped holes is adjacent to the circular hole, and a first protective film is fixedly connected between the movable plate and the side wall of the seepage well.

[0014] Furthermore, each of the wedge-shaped holes is fixedly connected to the side wall of the seepage well with a second protective film, each of the inner walls of the cavity is sealingly and slidably connected to a piston plate, and the side walls of the piston plate are symmetrically penetrated and fixedly connected with a drainage pipe, and one end of each of the drainage pipes penetrates the adjacent cavity and the side wall of the movable plate and is fixedly connected to the connecting cavity.

[0015] Furthermore, a fourth one-way valve is installed inside the drainage tube, a plurality of infusion tubes are fixedly connected through the sealing plate, one end of each of the infusion tubes is fixedly connected to the cavity, and a fifth one-way valve is installed inside the infusion tube.

[0016] A method for applying a foundation pit decompression and dewatering device comprises the following steps:

[0017] S1: By driving the electric spiral blade, mud and water are introduced into the seepage well. As the mud and water continue to enter, the floating plate will rise with the rising water level. Then, the flocculant reacts with the mud to separate the water from the mud. Then, the flocculated water in the seepage well is pumped out by a water pump. As the water is continuously pumped out, the water level in the seepage well begins to drop, and the floating plate moves down synchronously with the water level until the floating plate contacts the top of the bottom mud.

[0018] S2: To prevent excessive soil loss in the foundation pit and affect the bearing capacity of the foundation pit, close the first control valve on the sealing plate to make the seepage well airtight, and start four sonic detectors to detect the severity of soil loss. According to the soil loss situation, control the opening degree of the third one-way valve accordingly, and then use an air pump to continuously pump outside air into the seepage well. As the pressure continues to increase, the mud inside the seepage well is discharged along the corresponding circular holes for mud backfilling;

[0019] S3: After the precipitation operation is completed, the fourth one-way valve and the one-way injection valve are opened. The movable plate will be close to the seepage well under the action of the external soil. In this process, the piston plate is driven to move synchronously. The pressure difference generated by the sealing sliding between the piston plate and the cavity is used to make the coagulant inside the cavity enter the connecting cavity along the drainage pipe and be discharged along the injection hole, so that the coagulant contacts the moist soil. The coagulant reacts with the moisture in the soil to accelerate the consolidation process of the soil.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] By setting up a drainage component, the flocculant is used to react with the mud to separate the water from the mud. After the flocculant reaction is completed, the water pump is started to discharge the flocculated water in the seepage well. With the continuous extraction of water, the water level in the seepage well begins to drop, and the floating plate moves down synchronously with the water level until the floating plate contacts the top of the bottom mud. The water in the mud can be extracted to a great extent, and the amount of mud in the water is reduced, the damage of the mud to the water pump is reduced, and the practicality of the device is improved. A backfilling component is installed, and an acoustic wave detector is used to perform acoustic wave detection on each side to detect the places where the soil is missing. At the same time, the valve opening degree of the third one-way valve is controlled accordingly according to the severity of the soil missing. Then, the air pump is started, and the outside gas is sucked in along the suction pipe by the air pump, and passed into the seepage well along the exhaust pipe. Since the inside of the seepage well is in a closed state, as the air is continuously pumped into the seepage well, the pressure will continue to increase, so that the mud inside the seepage well is discharged along the corresponding circular hole, and the mud is backfilled to improve the safety effect;

[0022] By setting up a solidification component, the movable plate will be close to the seepage well under the action of external soil. During the movement, the spring is compressed and drives the piston plate to move synchronously. The pressure difference generated by the sealed sliding between the piston plate and the cavity is used to make the coagulant inside the cavity enter the connecting cavity along the drainage pipe. The internal space of the connecting cavity is small, so the coagulant will be discharged along the injection hole after entering the connecting cavity, so that the coagulant contacts the moist soil. The coagulant reacts with the moisture in the soil to accelerate the consolidation process of the soil, thereby improving the stability of the soil layer and improving the bearing effect on the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the foundation pit and the seepage well in the present invention;

[0025] Figure 3 It is a schematic diagram of the structures of the drainage component, the backfill component and the solidification component in the present invention;

[0026] Figure 4 It is a structural schematic diagram of the drainage component in the present invention;

[0027] Figure 5 is a cross-sectional view of the water seepage well in the present invention;

[0028] Figure 6 A side wall cross-sectional view of the water seepage well of the present invention;

[0029] Figure 7 is a cross-sectional view of the connecting pipe in the present invention;

[0030] Figure 8 It is a structural schematic diagram of the drainage component in the present invention;

[0031] Fig. 9 It is a structural schematic diagram of the backfill assembly in the present invention;

[0032] Fig.10 It is a schematic diagram of the structure of the solidification component of the present invention;

[0033] Fig.11 is an exploded view of the solidification component in the present invention;

[0034] Fig.12 It is a side view of the solidification assembly in the present invention.

[0035] In the figure: 1, foundation pit; 2, seepage well; 21, sealing plate; 22, through hole; 23, first control valve; 24, chute; 3, drainage assembly; 31, connecting pipe; 32, mounting ring; 33, electric spiral blade; 34, first one-way valve; 35, second one-way valve; 36, water pump; 37, water pump pipe; 39, drainage pipe; 311, floating plate; 312, first fixed plate; 313, first electrode sheet; 314, second fixed plate; 315, second electrode sheet; 316, liquid storage tank; 317, liquid outlet pipe; 31 8. Second control valve; 4. Backfill assembly; 41. Air pump; 42. Exhaust pipe; 44. Vacuum pipe; 46. Sonic wave detector; 47. Round hole; 48. Third one-way valve; 5. Solidification assembly; 51. Cavity; 52. Moving plate; 53. Wedge-shaped hole; 54. First protective film; 55. Second protective film; 56. Spring; 57. Drain pipe; 58. Piston plate; 59. Fourth one-way valve; 510. Infusion tube; 511. Fifth one-way valve; 512. Connecting cavity; 513. Injection hole; 514. One-way injection valve. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to solve the problem that the water contains a lot of mud and to avoid damage to the water pump, it will be filtered through a filter. However, if the mud content is too much, it will cause blockage. If the filter pore size is large, it will cause residual mud in the water and damage the pump body. Figure 1 - Figure 5 and Figure 7 - Figure 8 As shown, the following preferred technical solutions are provided:

[0038] A foundation pit decompression and dewatering device comprises a foundation pit 1 and a seepage well 2, wherein the seepage well 2 is fixedly connected around the foundation pit 1, as water enters the seepage well 2, the water contacts with the surrounding soil to form mud, and finally the mud enters the seepage well 2, a sealing plate 21 is fixedly connected to the port of each seepage well 2, a through hole 22 is opened at the top of each sealing plate 21, a first control valve 23 is installed inside the through hole 22, a drainage component 3 is fixedly installed at the top of each seepage well 2, by setting the drainage component 3, a floating plate 311 is used to rise with the increasing amount of water until the first electrode sheet 313 contacts the second electrode sheet 315, at which time the first one-way valve 34 is closed, and the second control valve 318 in the liquid storage tank 316 is opened, and the second one-way valve 35 is closed at the same time, and the flocculant in the liquid storage tank 316 is discharged under the action of gravity. It is discharged along the liquid outlet pipe 317, and then the second control valve 318 is closed to avoid excessive discharge of flocculant. The flocculant is used to react with the mud to separate the water and mud in the mud, so that the mud flocculates and sinks to the bottom. The separated water is located above the mud at the bottom. After the flocculant reaction is completed, the pumping pump 36 is started, and the flocculated water in the seepage well 2 is extracted along the pumping pipe 37 by the pumping pump 36, and discharged through the drain pipe 39. As the water is continuously extracted, the water level in the seepage well 2 begins to drop, and the floating plate 311 moves down synchronously with the water level until the floating plate 311 contacts the top of the bottom mud. Since there is a distance between the pumping pipe 37 and the bottom wall of the floating plate 311, the pumping pipe 37 does not contact the mud. As the pumping pump 36 continues to work, after all the water is pumped out, the pumping pump 36 is closed.

[0039] A backfill assembly 4 is fixedly installed at the top of each seepage well 2. By setting the backfill assembly 4, four acoustic wave detectors 46 at the top of the seepage well 2 are started. Each acoustic wave detector 46 corresponds to one side wall of the seepage well 2. When mud enters the inside of the connecting pipe 31 along all directions, the upper mud will sink to fill the bottom where the mud is lost, so that the mud loss around the seepage well 2 is the most serious. The acoustic wave detector 46 is used to perform acoustic wave detection on each side to detect the places where the soil is missing. At the same time, according to the severity of the soil loss, the valve opening degree of the third one-way valve 48 is controlled accordingly, and then the air pump 41 is started. The air pump 41 is used to draw in the outside air along the suction pipe 44 and pass it into the inside of the seepage well 2 along the exhaust pipe 42. Since the inside of the seepage well 2 is in a closed state, as the air is continuously pumped into the inside of the seepage well 2, the pressure will continue to increase, so that the mud inside the seepage well 2 is discharged along the corresponding circular hole 47, and the mud is backfilled to improve the safety effect.

[0040] Each side wall of the seepage well 2 is slidably mounted with a solidification assembly 5. By setting the solidification assembly 5, as the mud is continuously discharged along the circular hole 47, after it contacts with the external soil, a reaction force is generated on the moving plate 52. After opening the fourth one-way valve 59 and the one-way injection valve 514, the connecting chamber 512, the drainage pipe 57 and the cavity 51 are connected with the outside world, so that the moving plate 52 will be close to the seepage well 2 under the action of the external soil. During the movement, the spring 56 is compressed and the piston plate 58 is driven to move simultaneously. The piston plate 58 and the cavity 51 move step by step, and the pressure difference generated by the sealed sliding between the piston plate 58 and the cavity 51 is used to make the coagulant inside the cavity 51 enter the connecting cavity 512 along the drain pipe 57. The internal space of the connecting cavity 512 is relatively small, so that the coagulant will be discharged along the injection hole 513 after entering the connecting cavity 512, so that the coagulant contacts the moist soil. The coagulant reacts with the moisture in the soil to accelerate the consolidation process of the soil, thereby improving the stability of the soil layer, so as to improve the bearing effect on the foundation pit 1.

[0041] The drainage assembly 3 includes a connecting pipe 31, which passes through and is fixedly connected to the bottom wall of the seepage well 2. The inner wall of the connecting pipe 31 is symmetrically fixedly connected with a mounting ring 32. The two mounting rings 32 are jointly installed with an electric spiral blade 33. A first one-way valve 34 is installed at the bottom end of the connecting pipe 31, and a second one-way valve 35 is installed at the top of the connecting pipe 31. A slide groove 24 is opened on the inner wall of the seepage well 2, and a water pump 36 is fixedly connected to the top of the foundation pit 1.

[0042] The input end of the water pump 36 is fixedly connected to a water pump pipe 37, which is a retractable hose. The output end of the water pump 36 is fixedly connected to a drain pipe 39. A floating plate 311 is slidably embedded in the inner wall of the slide 24. The top of the floating plate 311 is fixedly connected to a first fixed plate 312, and the top of the first fixed plate 312 is fixedly connected to a first electrode sheet 313.

[0043] One end of the water pumping pipe 37 passes through the sealing plate 21 and is fixedly connected with the second fixed plate 314. The second fixed plate 314 is fixedly connected to the inner wall of the seepage well 2. The second electrode sheet 315 is fixedly connected to the bottom end of the second fixed plate 314. The inner wall of the other side of the seepage well 2 is fixedly connected to a liquid storage tank 316. The bottom wall of the liquid storage tank 316 is fixedly connected to a liquid outlet pipe 317. A second control valve 318 is installed inside the liquid outlet pipe 317.

[0044] In this solution: when in use, by driving the electric spiral blade 33, the electric spiral blade 33 is used to continuously introduce mud and water into the seepage well 2. As the mud and water continue to enter, the float 311 will rise as the water level continues to rise, and the float 311 is used to rise as the water volume continues to increase until the first electrode sheet 313 contacts the second electrode sheet 315. At this time, the first one-way valve 34 is closed, and the second control valve 318 in the liquid storage tank 316 is opened, and the second one-way valve 35 is closed at the same time. The first one-way valve 34 and the second one-way valve 35 are set so that the mud can only enter the seepage well 2 along the connecting pipe 31. When the second control valve 318 is opened, the flocculant in the liquid storage tank 316 is discharged along the liquid outlet pipe 317 under the action of gravity, and then the second control valve 318 is closed to avoid excessive discharge of the flocculant. The flocculant is used to react with the mud to separate the water and mud, so that the mud flocculates and sinks to the bottom, and the separated water is located above the mud at the bottom.

[0045] After the flocculant reaction is completed, the pump 36 is started, and the water after flocculation in the seepage well 2 is extracted along the pumping pipe 37 by the pumping pump 36, and discharged through the drain pipe 39. As the water is continuously extracted, the water level in the seepage well 2 begins to drop, and the float 311 moves down synchronously with the water level until the float 311 contacts the top of the bottom mud. Since there is a distance between the pumping pipe 37 and the bottom wall of the float 311, the pumping pipe 37 does not contact the mud. As the pump 36 continues to work, after all the water is pumped out, the pump 36 is turned off. Compared with the prior art, this solution can extract the water in the mud to a great extent, reduce the amount of mud in the water, reduce the damage of the mud to the pump 36, and improve the practicality of the device. The float 311 can float on the water surface and can change with the position of the water surface.

[0046] In order to solve the problem that the soil at the bottom of the foundation pit 1 will enter the seepage well 2 along with the water, causing the soil at the bottom of the foundation pit 1 to be missing, if the soil is missing too much, it will cause the foundation pit 1 to lose its bearing capacity, which will have an impact on the stability of the foundation pit 1. Figure 3 - Figure 4 and Fig. 9 As shown, the following preferred technical solutions are provided:

[0047] The backfill assembly 4 includes an air pump 41 , which is fixedly connected to the top of the foundation pit 1 , an air extraction pipe 44 is fixedly connected to the input end of the air pump 41 , and an exhaust pipe 42 is fixedly connected to the output end of the air pump 41 .

[0048] One end of the exhaust pipe 42 passes through the top wall of the sealing plate 21 and extends to the inside of the seepage well 2. A plurality of circular holes 47 are symmetrically opened on the inner wall of the seepage well 2. A third one-way valve 48 is installed inside each circular hole 47. A plurality of acoustic wave detectors 46 are symmetrically fixedly connected to the top of the seepage well 2.

[0049] In this scheme: after the water and mud are separated by the drainage component 3 and the water is extracted, the mixed mud is left in the seepage well 2. In order to avoid excessive soil loss in the foundation pit 1 and affect the bearing capacity of the foundation pit 1, the first control valve 23 on the sealing plate 21 is closed. At this time, the second one-way valve 35 is also in a closed state, so that the inside of the seepage well 2 is in a closed state, and then the four acoustic wave detectors 46 at the top of the seepage well 2 are started. Each acoustic wave detector 46 corresponds to one side wall of the seepage well 2. The mud enters the inside of the connecting pipe 31 in all directions, so that the upper mud will sink and fill the position where the mud is lost at the bottom, resulting in a serious lack of mud around the seepage well 2. The acoustic wave detector 46 is used to perform acoustic wave detection on each side to detect the place where the soil is missing. At the same time, according to the severity of the soil loss, the valve opening degree of the third one-way valve 48 is controlled accordingly; wherein the third one-way valve 48 allows the mud to be discharged only from the inside of the seepage well 2 along the circular hole 47 to the outside;

[0050] Then start the air pump 41, and use the air pump 41 to draw in external air along the exhaust pipe 44, and pass it into the seepage well 2 along the exhaust pipe 42. Since the inside of the seepage well 2 is in a closed state, as the air is continuously pumped into the seepage well 2, the pressure will continue to increase, so that the mud inside the seepage well 2 will be discharged along the corresponding circular hole 47, and the mud will be backfilled. The device draws in a part of the mud, then separates the water and the mud, extracts the water, and then backfills the mud. The whole process is in dynamic balance, so the mud is continuously backfilled in time to avoid excessive lack of soil, which affects the bearing capacity of the foundation pit 1 and improves the safety effect.

[0051] In order to solve the technical problems that after the mud is backfilled, the mud contains water, has poor firmness and stability, and it takes a certain amount of time for natural consolidation, which has limitations, such as Figure 4 - Figure 6 and Fig.10 - Fig.12 As shown, the following preferred technical solutions are provided:

[0052] The solidification component 5 includes a cavity 51, which is symmetrically opened on the side wall of the seepage well 2. A movable plate 52 is symmetrically fixedly connected to the side wall of the seepage well 2. A connecting cavity 512 is opened inside the movable plate 52. A plurality of injection holes 513 are opened on the side wall of the connecting cavity 512. A one-way injection valve 514 is installed inside each injection hole 513. A spring 56 is symmetrically fixedly connected to the side wall of the movable plate 52.

[0053] Each spring 56 is fixedly connected to the side wall of the seepage well 2 . The side wall of the movable plate 52 is symmetrically provided with wedge-shaped holes 53 . Each wedge-shaped hole 53 is adjacent to the circular hole 47 . A first protective film 54 is fixedly connected between the movable plate 52 and the side wall of the seepage well 2 .

[0054] Each wedge-shaped hole 53 is fixedly connected to the side wall of the seepage well 2 with a second protective film 55, and the inner wall of each cavity 51 is sealed and slidably connected to a piston plate 58. The side wall of the piston plate 58 is symmetrically penetrated and fixedly connected with a drainage pipe 57, and one end of each drainage pipe 57 penetrates the adjacent cavity 51 and the side wall of the movable plate 52 and is fixedly connected to the connecting cavity 512.

[0055] A fourth one-way valve 59 is installed inside the discharge pipe 57, and a plurality of infusion tubes 510 are fixedly connected to the sealing plate 21. One end of each infusion tube 510 is fixedly connected to the cavity 51, and a fifth one-way valve 511 is installed inside the infusion tube 510. When the coagulant needs to be replenished, the fifth one-way valve 511 is opened, and the coagulant is replenished to the cavity 51 through the infusion tube 510 for continuous use.

[0056] In this solution, after the precipitation operation is completed, the mud is backfilled in time by the backfill assembly 4, but the mud still contains water and its stability is poor. As the mud is continuously discharged along the circular hole 47, it contacts with the external soil and generates a reaction force on the movable plate 52. After opening the fourth one-way valve 59 and the one-way injection valve 514, the connecting chamber 512, the drainage pipe 57 and the cavity 51 are connected with the outside world. Therefore, the movable plate 52 will be close to the seepage well 2 under the action of the external soil. During the movement, the spring 56 is compressed and the piston plate 58 is driven to move synchronously. The seal between the piston plate 58 and the cavity 51 is used to seal the movable plate 52. The pressure difference generated by the sealing sliding causes the coagulant inside the cavity 51 to enter the connecting cavity 512 along the drainage pipe 57. The internal space of the connecting cavity 512 is relatively small, so that the coagulant will be discharged along the injection hole 513 after entering the connecting cavity 512, so that the coagulant comes into contact with the moist soil. The coagulant reacts with the moisture in the soil to accelerate the consolidation process of the soil, thereby improving the stability of the soil layer and improving the bearing effect on the foundation pit 1. The first protective film 54 and the second protective film 55 are set to prevent the mud from entering the gap between the movable plate 52 and the seepage well 2 to avoid causing a limiting effect.

[0057] A method for a foundation pit decompression and dewatering device, comprising the following steps:

[0058] Step 1: The electric spiral blade 33 is driven to introduce mud and water into the seepage well 2. As the mud and water continue to enter, the floating plate 311 will rise as the water level continues to rise. Then, the flocculant reacts with the mud to separate the water from the mud. Then, the water after flocculation in the seepage well 2 is pumped out by the water pump 36. As the water is continuously pumped out, the water level in the seepage well 2 begins to drop, and the floating plate 311 moves downward synchronously with the water level until the floating plate 311 contacts the top of the bottom mud.

[0059] Step 2: To prevent excessive soil loss in the foundation pit 1 and affect the bearing capacity of the foundation pit 1, close the first control valve 23 on the sealing plate 21 to make the seepage well 2 airtight, and start four sonic wave detectors 46 to detect the severity of soil loss. According to the soil loss situation, the valve opening degree of the third one-way valve 48 is controlled accordingly, and then the air pump 41 is used to continuously pump outside air into the seepage well 2. As the pressure continues to increase, the mud inside the seepage well 2 is discharged along the corresponding circular hole 47 to perform mud backfilling;

[0060] Step 3: After the precipitation operation is completed, open the fourth one-way valve 59 and the one-way injection valve 514. The movable plate 52 will be close to the infiltration well 2 under the action of the external soil. In this process, the piston plate 58 will be driven to move synchronously. The pressure difference generated by the sealed sliding between the piston plate 58 and the cavity 51 is used to make the coagulant inside the cavity 51 enter the connecting cavity 512 along the drain pipe 57 and be discharged along the injection hole 513, so that the coagulant contacts the moist soil. The coagulant reacts with the moisture in the soil to accelerate the consolidation process of the soil.

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foundation pit decompression and dewatering device, comprising a foundation pit (1) and a seepage well (2), characterized in that: The seepage wells (2) are fixedly connected to the periphery of the foundation pit (1); a sealing plate (21) is fixedly connected to the port of each of the seepage wells (2); a through hole (22) is opened at the top of each of the sealing plates (21); a first control valve (23) is installed inside the through hole (22); a drainage component (3) is fixedly installed at the top of each of the seepage wells (2); a backfill component (4) is fixedly installed at the top of each of the seepage wells (2); and a solidification component (5) is slidably installed on the side wall of each of the seepage wells (2); The drainage assembly (3) comprises a connecting pipe (31), the connecting pipe (31) penetrates and is fixedly connected to the bottom wall of the seepage well (2), the inner wall of the connecting pipe (31) is symmetrically fixedly connected with a mounting ring (32), two mounting rings (32) are commonly installed with an electric spiral blade (33), the bottom end of the connecting pipe (31) is installed with a first one-way valve (34), the top end of the connecting pipe (31) is installed with a second one-way valve (35), the inner wall of the seepage well (2) is provided with a slide groove (24), and the top end of the foundation pit (1) is fixedly connected with a water pump (36); The input end of the water pump (36) is fixedly connected to a water pump pipe (37), the water pump pipe (37) is a retractable hose, the output end of the water pump (36) is fixedly connected to a drainage pipe (39), a floating plate (311) is slidably embedded in the inner wall of the slide groove (24), the top end of the floating plate (311) is fixedly connected to a first fixed plate (312), and the top end of the first fixed plate (312) is fixedly connected to a first electrode sheet (313); One end of the water pumping pipe (37) passes through the sealing plate (21) and is fixedly connected to the second fixing plate (314); the inner wall of the water seepage well (2) is fixedly connected to the second fixing plate (314); the bottom end of the second fixing plate (314) is fixedly connected to the second electrode sheet (315); the inner wall of the other side of the water seepage well (2) is fixedly connected to a liquid storage tank (316); the bottom wall of the liquid storage tank (316) is fixedly connected to a liquid outlet pipe (317); a second control valve (318) is installed inside the liquid outlet pipe (317); The backfill assembly (4) comprises an air pump (41), the air pump (41) is fixedly connected to the top of the foundation pit (1), the input end of the air pump (41) is fixedly connected to an air extraction pipe (44), the output end of the air pump (41) is fixedly connected to an exhaust pipe (42), one end of the exhaust pipe (42) passes through the top wall of the sealing plate (21) and extends to the inside of the seepage well (2), the inner side wall of the seepage well (2) is symmetrically provided with a plurality of circular holes (47), each of the circular holes (47) is installed with a third one-way valve (48), and the top of the seepage well (2) is symmetrically fixedly connected to a plurality of acoustic wave detectors (46); The solidification component (5) comprises a cavity (51), the cavity (51) is symmetrically arranged on the side wall of the seepage well (2), a movable plate (52) is symmetrically fixedly connected to the side wall of the seepage well (2), a connecting cavity (512) is arranged inside the movable plate (52), a plurality of injection holes (513) are arranged on the side wall of the connecting cavity (512), a one-way injection valve (514) is installed inside each of the injection holes (513), and a spring (56) is symmetrically fixedly connected to the side wall of the movable plate (52).

2. A foundation pit decompression and dewatering device according to claim 1, characterized in that: Each of the springs (56) is fixedly connected to the side wall of the water seepage well (2); the side wall of the movable plate (52) is symmetrically provided with wedge-shaped holes (53); each of the wedge-shaped holes (53) is adjacent to the circular hole (47); and a first protective film (54) is fixedly connected between the movable plate (52) and the side wall of the water seepage well (2).

3. A foundation pit decompression and dewatering device according to claim 2, characterized in that: Each of the wedge-shaped holes (53) is fixedly connected to the side wall of the seepage well (2) with a second protective film (55); the inner wall of each of the cavities (51) is sealingly and slidably connected to a piston plate (58); a drainage pipe (57) is symmetrically passed through and fixedly connected to the side wall of the piston plate (58); one end of each of the drainage pipes (57) passes through the adjacent cavity (51) and the side wall of the movable plate (52) and is fixedly connected to the connecting cavity (512).

4. A foundation pit decompression and dewatering device according to claim 3, characterized in that: A fourth one-way valve (59) is installed inside the drainage pipe (57); a plurality of infusion pipes (510) are fixedly connected to the sealing plate (21); one end of each of the infusion pipes (510) is fixedly connected to the cavity (51); and a fifth one-way valve (511) is installed inside the infusion pipe (510).

5. A method for applying a foundation pit decompression and dewatering device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: By driving the electric spiral blade, mud and water are introduced into the seepage well. As the mud and water continue to enter, the floating plate will rise with the rising water level. Then, the flocculant reacts with the mud to separate the water from the mud. Then, the flocculated water in the seepage well is pumped out by a water pump. As the water is continuously pumped out, the water level in the seepage well begins to drop, and the floating plate moves down synchronously with the water level until the floating plate contacts the top of the bottom mud. S2: To prevent excessive soil loss in the foundation pit and affect the bearing capacity of the foundation pit, close the first control valve on the sealing plate to make the seepage well airtight, and start four sonic detectors to detect the severity of soil loss. According to the soil loss situation, control the opening degree of the third one-way valve accordingly, and then use an air pump to continuously pump outside air into the seepage well. As the pressure continues to increase, the mud inside the seepage well is discharged along the corresponding circular holes for mud backfilling; S3: After the precipitation operation is completed, the fourth one-way valve and the one-way injection valve are opened. The movable plate will be close to the seepage well under the action of the external soil. In this process, the piston plate is driven to move synchronously. The pressure difference generated by the sealing sliding between the piston plate and the cavity is used to make the coagulant inside the cavity enter the connecting cavity along the drainage pipe and be discharged along the injection hole, so that the coagulant contacts the moist soil. The coagulant reacts with the moisture in the soil to accelerate the consolidation process of the soil.

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