Plugging device for tube well penetrating through bottom plate and anti-seepage treatment method

Abstract

The invention discloses a bottom plate penetrating tube well plugging device and an anti-seepage treatment method.The device comprises a water pump arranged at the bottom of a tube well, the water pump is connected with a water pump drainage pipe and a water pump cable, and the device further comprises an anti-seepage sleeve, a bottom tray, a secondary grouting pipe, a pump pipe valve and a primary grouting pipe; the anti-seepage sleeve is of a cylindrical structure and is arranged on a wellhead of a tube well in a sleeving mode, an outer water stop ring is arranged on the outer wall of the anti-seepage sleeve, and an inner water stop ring is arranged in the anti-seepage sleeve. Multiple anti-leakage defense lines are constructed at the hole, penetrating through the bottom plate, of the tube well, so that the water leakage risk of the underground structure is reduced; based on the device, the bottom plate penetrating tube well plugging and anti-seepage treatment method is provided, tube well plugging can be carried out under the conditions that underground water is high and a downcast tube well is completely located in an underground structure, meanwhile, the underground water level can be lowered again after the underground water level rises and the underground structure leaks, and the anti-seepage effect of the downcast tube well is improved. And a water-free and pressure-free operation condition is created for anti-leakage maintenance.

Description

Technical Field

[0001] The invention relates to the field of drainage and waterproofing treatment in underground structure construction of buildings and municipal engineering, and specifically relates to a bottom plate pipe well plugging device and an anti-leakage treatment method. Background Art

[0002] When underground engineering construction is carried out in strata with high groundwater levels and strong permeability, it is necessary to carry out dewatering construction. Due to the influence of the surrounding environment, it is impossible to set up dewatering pipe wells outside the foundation pit in most cases. The dewatering pipe wells can only be moved and set inside the foundation pit. As the earthwork is excavated, the pipe well wall structure is gradually removed, and the water pump continues to operate for dewatering. During the construction of the underground structure floor, the pipe well is passed through the floor, and the pipe well and water pump continue to operate inside the underground structure. After the underground structure is completed, the water pump and the water pump drainage pipe are removed and the pipe well is sealed.

[0003] However, in strata with high groundwater levels and strong permeability, once precipitation stops, the groundwater level will rise rapidly, sometimes submerging the floor of the underground structure within tens of minutes, gushing out from the pipe wells to form fountains, making it impossible to carry out normal pipe well sealing smoothly; even if forced sealing is carried out, it will leave leakage risks in the later stage. If it is not properly handled fundamentally, the leakage of the floor will seriously affect the quality and use function of the underground structure.

[0004] Based on the above reasons, it is necessary to propose a safe, reliable and easy-to-operate bottom plate pipe well plugging device and anti-leakage treatment method. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a pipe well sealing device that passes through the bottom plate and a leakage prevention method, aiming to solve the problem that the pipe well cannot be successfully sealed due to the rapid rise of water level in the permeable stratum and there is a leakage risk after forced sealing.

[0006] Technical solution: To achieve the above-mentioned purpose, the first aspect of the present invention proposes a plugging device for a pipe well passing through a bottom plate, which adopts the following technical scheme: A pipe well plugging device for penetrating a bottom plate comprises a water pump arranged at the bottom of the pipe well, the water pump is connected to a water pump drainage pipe and a water pump cable, and also comprises an anti-seepage casing, a bottom tray, a secondary grouting pipe, a pump pipe valve, and a primary grouting pipe; The anti-seepage casing is a cylindrical structure, which is sleeved on the wellhead of the pipe well and pre-installed in the structural bottom plate. The outer wall of the anti-seepage casing is provided with an outer water stop ring, and the inside is provided with an inner water stop ring; The bottom tray is installed on the water pump drainage pipe, the inner ring is sealed with the water pump drainage pipe, the outer edge is sealed with the inner wall of the anti-seepage casing, and a reinforcing rib is arranged on the water pump drainage pipe located on the upper part of the bottom tray; The secondary grouting pipe is installed on the bottom tray, the lower part of which passes through the bottom tray and is tightly connected to the bottom tray, and the upper part of which extends out of the top of the anti-seepage casing and is connected to the secondary grouting valve; The pump pipe valve is installed on the upper part of the water pump drainage pipe, and the pump pipe valve can be detachably connected to a primary grouting pipe; The primary plugging material and the secondary plugging material are poured into the anti-seepage casing from bottom to top, and the water pump drainage pipe, the secondary grouting pipe and the pipe well are poured with filling slurry.

[0007] Preferably, the reinforcing ribs are well-shaped reinforcing ribs, and the ends of the well-shaped reinforcing ribs are bent into an L-shape and fixed to the inner wall of the anti-seepage casing.

[0008] Preferably, the outer water-stop ring is sealed and connected to the outer wall of the anti-seepage casing and cast in the structural base plate to form a whole with the structural base plate.

[0009] Preferably, the water pump cable passes through the interior of the secondary grouting pipe and is connected to the water pump.

[0010] Preferably, the bottom tray has an inward groove at its edge, an expansion water stop strip is installed inside the inward groove, a sealing ring is installed on the upper portion of the bottom tray edge, and the bottom tray is sealed and connected to the anti-seepage sleeve via the sealing ring.

[0011] Based on the above-mentioned device for plugging a pipe well through a bottom plate, the second aspect of the present invention provides a method for plugging and preventing leakage of a pipe well through a bottom plate, which specifically includes the following steps: Step 1: Pre-install the anti-seepage casing; Step 2: Divide the order of shutting down the tube wells; divide the tube wells into the first stage of plugging and the second stage of plugging; Step 3: Preliminary inspection and preparation; cleaning and inspection of the pipe wells blocked in the second phase; Step 4: Install a plugging device; the plugging device includes a bottom tray, reinforcement ribs, a pump pipe valve, a secondary grouting pipe and a secondary grouting valve; Step 5: Fix the bottom tray and reinforcement ribs; Step 6: injecting primary plugging material into the tube well plugged in the second stage; Step 7: Plug the tube wells plugged in the first stage; Step 8: Install a grouting pipe for the pipe well blocked in the second stage; Step 9: For the pipe well blocked in the second stage, inject filling slurry from the primary grouting pipe into the water pump drainage pipe; Step 10: Inject filling slurry from the secondary grouting pipe into the tube well plugged in the second stage; Step 11: injecting secondary plugging materials into the tube well plugged in the second stage; Step 12: Install waterproofing materials on the pipe wells that were blocked in the second phase.

[0012] Preferably, in step 1, the anti-seepage casing is sleeved on the wellhead of the pipe well, an outer water stop ring is installed on the outside of the anti-seepage casing, the outer water stop ring and the anti-seepage casing are tightly connected and cast together in the structural bottom plate material, the water pump drainage pipe and the water pump cable are passed through the anti-seepage casing and fixed on the top of the anti-seepage casing, so that the water pump continues to pump water; In step 2, the operation status and water level depth of all the pipe wells within the bottom plate range are checked, and according to the operation status and location distribution of the pipe wells, some of the pipe wells are included in the first stage of plugging, and other pipe wells are included in the second stage of plugging; In the step 3, the stains and rust inside the anti-seepage casing are cleaned for the pipe well blocked in the second stage; In step 4, the water pump and the water pump drainage pipe inside the pipe well blocked in the second stage are lifted up to a certain height in sequence, and a bottom tray, a well-shaped reinforcement rib, a pump pipe valve, a secondary grouting pipe and a secondary grouting valve are installed on the outer side of the upper part of the water pump drainage pipe; In step 5, the water pump and water pump drainage pipe of the pipe well blocked in the second stage are slowly lowered, and the bottom tray, pump pipe valve, and secondary grouting pipe are completely placed inside the anti-seepage casing. The bent section at the end of the well-shaped reinforcement bar is tightly fixed to the inner wall of the anti-seepage casing; In step 6, the water pump, pump pipe valve, and secondary grouting valve in the pipe well blocked in the second stage are closed in sequence, and the primary plugging material is poured into the inside of the anti-seepage casing and the upper part of the bottom tray. After the primary plugging material of the pipe well blocked in the second stage is fully poured, all the water pumps are started; In step 7, the water pump and water pump drainage pipe of the pipe well blocked in the first stage are lifted out of the well, and then the blocking material is backfilled in the well from bottom to top to below the structural bottom plate, and an inner water stop ring is installed inside the anti-seepage casing; the same concrete as the structural bottom plate is poured inside the anti-seepage casing, and after the concrete solidifies, the top sealing plate is installed on the top of the anti-seepage casing, and the top sealing plate is tightly connected to the top of the anti-seepage casing, and the encapsulating waterproof material is wrapped and wound around the exposed upper part of the anti-seepage casing and the top sealing plate, and the bottom of the encapsulating waterproof material is firmly adhered to the outer wall of the anti-seepage casing. Restore the hydrophobic layer and floor surface layer above the structural bottom plate; In the step 8, the water pumps and pump pipe valves of all the pipe wells blocked in the second stage are closed, a primary grouting pipe is installed on the pump pipe valve, and the secondary grouting valve is closed; In step 9, for the pipe well blocked in the second stage, the pump pipe valves are opened in sequence, and the filling slurry is pressure-injected into the water pump drainage pipe along the primary grouting pipe, and the secondary grouting valve is opened at the same time to discharge the residual gas and water in the pipe well from the secondary grouting pipe, and the filling slurry is continuously injected into the pipe well from the primary grouting pipe until the filling slurry continuously overflows from the secondary grouting pipe; In step 10, for the pipe well blocked in the second stage, the filling slurry is reversely injected from the secondary grouting pipe into the pipe well; at the same time, the pump pipe valve is opened to discharge the air and water remaining in the water pump drainage pipe from the primary grouting pipe; In step 11, for the second-stage plugged pipe well, an inner water stop ring is installed on the inner wall of the anti-seepage casing and secondary plugging material is poured, and the inner water stop ring, pump pipe valve, and secondary grouting valve are completely submerged and sealed in the secondary plugging material. The top sealing plate is installed on the top of the anti-seepage casing; In step 12, for the pipe well blocked in the second stage, the encapsulating waterproof material is wrapped and wound around the upper part of the exposed anti-seepage casing and the top sealing plate to restore the hydrophobic layer and the floor surface layer on the structural bottom plate.

[0013] Preferably, in step 2, pipe wells with poor operating status, close adjacent pipe wells, and high bottom plate top elevations, as well as some observation and spare pipe wells are included in the first stage of plugging, and pipe wells with good operating status, distant adjacent pipe wells, and low bottom plate top elevations are included in the second stage of plugging.

[0014] Preferably, in step 4, the middle of the well-shaped reinforcement rib is firmly installed around the water pump drainage pipe, the end is bent into an L shape, and the bent part is tightly fixed to the inner wall of the anti-seepage casing, and is encapsulated together when the initial plugging material is poured.

[0015] Preferably, in step 4, when installing the bottom tray, an expansion water stop strip is installed in the annular inward groove at the edge of the bottom tray, and a sealing ring is installed on the upper part of the annular inward groove at the edge of the bottom tray.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can seal the pipe well when the groundwater is high and the precipitation pipe well is completely in the underground structure by arranging sealing devices such as an anti-seepage casing, a primary grouting pipe, and a secondary grouting pipe.

[0017] 2. The present invention seals the pipe well twice. After the initial sealing, the initial sealing material and the relevant sealing device form a rigid plug body that can resist the groundwater level to restore the rising head pressure and keep the water pump running continuously. Then, after the groundwater level rises and leakage occurs in the underground structure, the groundwater level is lowered again to create water-free and pressure-free working conditions for anti-leakage maintenance.

[0018] 3. The present invention constructs multiple anti-leakage defense lines at the hole where the pipe well passes through the bottom plate by arranging anti-seepage casing, external water-stop ring, internal water-stop ring and other devices. At the same time, grouting is performed twice to make the interior of the pipe well completely filled with slurry, further reducing the risk of water leakage in the underground structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the installation process of the bottom plate pipe well plugging device of the present invention; Figure 2 This is a schematic diagram of the installation of the bottom plate pipe well plugging device of the present invention; Figure 3 It is a schematic diagram of the anti-seepage casing and the outer water stop ring of the present invention; Figure 4 It is a schematic diagram of the anti-seepage casing and the inner water stop ring of the present invention; Figure 5 This is a schematic diagram of the bottom tray of the present invention; Figure 6 A schematic diagram of the well-shaped reinforcement bar of the present invention; Figure 7 This is a schematic diagram of the process of pre-installing an anti-seepage casing in step 1 of the present invention; Figure 8 This is a schematic diagram of the process of installing a bottom tray and other blocking devices in step 4 of the present invention; Fig. 9 This is a schematic diagram of the process of fixing the bottom tray and the well-shaped reinforcement ribs in step 5 of the present invention; Fig.10 This is a schematic diagram of the process of pouring the primary plugging material in step 6 of the present invention; Fig.11 This is a schematic diagram of the pipe well plugging process of the first stage plugging in step 7 of the present invention; Fig.12 This is a schematic diagram of the process of installing a grouting pipe in step 8 of the present invention; Fig.13 This is a schematic diagram of the process of injecting filling material from the water pump drainage pipe in step 9 of the present invention; Fig.14 This is a schematic diagram of the process of injecting filling material from the secondary grouting pipe in step 10 of the present invention; Fig.15 This is a schematic diagram of the process of pouring secondary plugging material in step 11 of the present invention; Fig.16 This is a schematic diagram of the process of installing the encapsulated waterproof material in step 12 of the present invention; Fig.17 For the present invention Figure 1 Enlarged view of point A in the middle.

[0020] Among them, 001, structural base plate; 002, hydrophobic layer; 003, floor surface layer; 004, pipe well; 005, water pump; 006, water pump drainage pipe; 007, water pump cable; 1. Anti-seepage casing; 2. External water stop ring; 3. Internal water stop ring; 4. Bottom tray; 5. Expansion water stop strip; 6. Sealing ring; 7. Secondary grouting pipe; 8. Well-shaped reinforcement ribs; 9. Pump pipe valve; 10. Secondary grouting valve; 11. Primary plugging material; 12. Secondary plugging material; 13. Primary grouting pipe; 14. Filling slurry; 15. Top sealing plate; 16. Encapsulated waterproof material; 17. Gravel; 18. Medium-coarse sand; 19. Concrete. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 As shown, the present invention provides a plugging device for a pipe well passing through a bottom plate, comprising a water pump 005 arranged at the bottom of a pipe well 004, the water pump 005 being connected with a water pump drainage pipe 006 and a water pump cable 007, and also comprising an anti-seepage casing 1, a bottom tray 4, a secondary grouting pipe 7, a pump pipe valve 9, and a primary grouting pipe 13; The anti-seepage casing 1 is a cylindrical structure, which is sleeved on the wellhead of the pipe well 004 and pre-installed in the structural bottom plate 001. The outer wall of the anti-seepage casing 1 is provided with an outer water stop ring 2, and the inner wall is provided with an inner water stop ring 3; The bottom tray 4 is installed on the water pump drainage pipe 006 and is sealed to the water pump drainage pipe 006. The outer edge of the bottom tray 4 is sealed to the inner wall of the anti-seepage casing 1. A reinforcing rib is provided on the water pump drainage pipe 006 located on the upper part of the bottom tray 4. The secondary grouting pipe 7 is installed on the bottom tray 4, the lower part of which passes through the tray 4 and is tightly connected to the bottom tray 4, and the upper part of which extends out of the top of the anti-seepage casing 1 and is connected to the secondary grouting valve 10; The pump pipe valve 9 is installed on the upper part of the water pump drainage pipe 006, and the pump pipe valve 9 can be detachably connected to a primary grouting pipe 13; The anti-seepage casing 1 is filled with primary plugging material 11 and secondary plugging material 12 from bottom to top, and the water pump drainage pipe 006, the secondary grouting pipe 7 and the pipe well 004 are filled with filling slurry 14.

[0023] Specifically, the anti-seepage casing 1 is sleeved on the wellhead of the pipe well 004 and pre-installed in the structural bottom plate 001. The anti-seepage casing 1 is a cylindrical structure, with hollows on the upper and lower sides without structures. The inner diameter of the anti-seepage casing 1 is slightly larger than the outer diameter of the pipe well 004, and the length is slightly larger than the thickness of the structural bottom plate 001. The bottom of the anti-seepage casing 1 is lower than the bottom surface of the structural bottom plate 001, and the top surface of the anti-seepage casing 1 is slightly higher than the top surface of the structural bottom plate 001. An external water stop ring 2 is installed on the outside of the anti-seepage casing 1, such as Figure 3 As shown, the outer water stop ring 2 is tightly connected to the anti-seepage casing 1, and there is no gap for water seepage. After the anti-seepage casing 1 and the outer water stop ring 2 are manufactured, they are placed on the outside of the top of the pipe well 004 and poured into the material of the structural bottom plate 001, forming a whole with the structural bottom plate 001. Due to the anti-leakage measures of the structural bottom plate 001 itself and the existence of the outer water stop ring 2, groundwater cannot leak upward from the outside of the anti-seepage casing 1. The water pump drainage pipe 006 and the water pump cable 007 are passed through the anti-seepage casing 1 and temporarily fixed on the top of the anti-seepage casing 1, so that the water pump 005 can continue to operate.

[0024] The bottom tray 4 is installed on the water pump drainage pipe 006 and is tightly connected to the water pump drainage pipe 006. The outer diameter of the bottom tray 4 is slightly smaller than the inner diameter of the anti-seepage casing 1. The edge of the bottom tray 4 has an inward groove, such as Figure 5 , Fig.17 As shown, an expansion water stop strip 5 is installed in the inward groove. After the expansion water stop strip 5 expands in volume when it encounters water, it can fill the annular gap between the edge of the bottom tray 4 and the inner wall of the anti-seepage casing 1, which can prevent groundwater from penetrating into the underground structure along the inner wall of the anti-seepage casing 1. A sealing ring 6 is installed on the upper part of the edge of the bottom tray 4. The outer diameter of the sealing ring 6 is slightly larger than the inner diameter of the anti-seepage casing 1. It is made of semi-rigid material and can completely fill the annular gap between the edge of the bottom tray 4 and the inner wall of the anti-seepage casing 1, ensuring that the primary plugging material 11 will not fall into the lower part of the pipe well 004.

[0025] The water pump drainage pipe 006 is installed with a well-shaped reinforcement rib 8 on the upper part of the bottom tray 4, such as Figure 6 As shown, the middle position of the well-shaped reinforcement rib 8 is firmly installed around the water pump drainage pipe 006, and the end of the well-shaped reinforcement rib 8 is bent into an L shape, and the bent part is tightly fixed to the inner wall of the anti-seepage casing 1. When the initial plugging material 11 is poured, it is poured together and condensed inside, thereby increasing the adhesion between the water pump drainage pipe 006 and the initial plugging material 11, and preventing the running vibration of the water pump 005 from affecting the close fit between the water pump drainage pipe 006 and the initial plugging material 11, as well as between the initial plugging material 11 and the inner wall of the anti-seepage casing 1.

[0026] The pump pipe valve 9 is installed on the water pump drainage pipe 006, on the upper part of the bottom tray 4 and the well-shaped reinforcement rib 8, and below the top of the anti-seepage casing 1. The pump pipe valve 9 can be opened or closed according to the process arrangement. The water pump drainage pipe 006 is installed on the upper part of the pump pipe valve 9, and a primary grouting pipe 13 can also be installed.

[0027] The secondary grouting pipe 7 is installed on the bottom tray 4, the lower part of the secondary grouting pipe 7 passes through and protrudes under the bottom tray 4, vertically passes through the bottom tray 4 and is tightly connected to the bottom tray 4, and the secondary grouting pipe 7 passes through the bottom tray 4 and is vertically upward and parallel to the water pump drainage pipe 006, and extends out of the top of the anti-seepage casing 1. The secondary grouting valve 10 is installed on the upper part of the secondary grouting pipe 7. The vertical height of the secondary grouting valve 10 is lower than the top of the anti-seepage casing 1, that is, it is installed inside the anti-seepage casing 1. The secondary grouting valve 10 can be opened or closed according to the process arrangement. The inner diameter of the secondary grouting pipe 7 and the secondary grouting valve 10 is larger than the outer diameter of the water pump cable 007. The water pump cable 007 can pass through the secondary grouting pipe 7 and the secondary grouting valve 10, and is connected to the power supply system, so that the water pump 005 can be continuously powered.

[0028] Installed plugging device, such as Figure 1 shown.

[0029] The primary plugging material 11 is poured into the upper part of the bottom tray 4 and the lower part of the anti-seepage casing 1, and vibrated to make it dense. The parameters of the primary plugging material 11, such as the height, strength, and frictional resistance between the primary plugging material 11 and the inner wall of the anti-seepage casing 1, should be greater than the head pressure generated by the rise of the groundwater level after the water pump 005 is shut down. After the primary plugging material 11 solidifies, the bottom tray 4, the water pump drainage pipe 006, the secondary grouting pipe 7, and the well-shaped reinforcement ribs 8 inside the anti-seepage casing 1 can be completely fitted and fixed together with the inner wall of the anti-seepage casing 1 to form a rigid plug body to resist the head pressure of the groundwater level recovery. Since the primary plugging material 11 is outside the water pump drainage pipe and the secondary grouting pipe 7, it does not affect the normal operation of the water pump 005, which provides conditions for the subsequent start-up and operation of the water pump 005.

[0030] Filling slurry 14 is poured into the pipe well 004, the water pump drainage pipe 006 and the secondary grouting pipe 7. The filling slurry 14 is poured into the pipe well 004 from the water pump drainage pipe 006 and the secondary grouting pipe 7 in sequence after the water pump 005 is shut down and the anti-leakage inspection and repair of the structural bottom plate 001 are qualified, and a condensate of the filling slurry 14 is formed. After the filling slurry 14 is condensed, the cavities such as the pipe well 004 and the water pump drainage pipe 006 under the structural bottom plate 001 can be completely filled and compacted to ensure the stability of the stratum under the structural bottom plate 001, and at the same time, the channel for groundwater to penetrate upward along the pipe well 004 and the water pump drainage pipe 006 into the underground structure is also closed.

[0031] The inner water stop ring 3 is installed inside the anti-seepage casing 1. Figure 4 As shown, it is tightly connected to the inner wall of the anti-seepage casing 1. The inner water stop ring 3 is installed under the top of the anti-seepage casing 1 and above the primary plugging material 11. The function of the inner water stop ring 3 is to prevent groundwater from penetrating upward into the underground structure along the tiny gap between the inner wall of the anti-seepage casing 1 and the primary plugging material 11 and the secondary plugging material 12.

[0032] The secondary plugging material 12 is poured on the top of the primary plugging material 11. Before pouring the secondary plugging material 12, the top surface of the primary plugging material 11 is roughened and cleaned, and then the secondary plugging material 12 is filled into the entire anti-seepage casing 1, and the inner water stop ring 3, the pump pipe valve 9, and the secondary grouting valve 10 are completely sealed in the secondary plugging material 12. After the secondary plugging material 12 solidifies, it fills the entire interior of the anti-seepage casing 1 together with the primary plugging material 11, and through adhesion and friction with the inner wall of the anti-seepage casing 1, and solidification and bite with the well-shaped reinforcement ribs 8 and the inner water stop ring 3, the entire anti-seepage casing 1 and the structural bottom plate 001 form a whole, and jointly bear the upper load and groundwater buoyancy.

[0033] like Figure 2 As shown, the top sealing plate 15 is installed on the top of the anti-seepage casing 1 after the secondary plugging material 12 is completely solidified, and the top sealing plate 15 is tightly connected to the top of the anti-seepage casing 1. The encapsulating waterproof material 16 is wrapped and wound around the exposed top of the anti-seepage casing 1, and the bottom is firmly adhered to the outer wall of the anti-seepage casing 1. Finally, the hydrophobic layer 002 and the floor surface layer 003 are restored to complete the plugging work and anti-seepage treatment work of the pipe well 004.

[0034] Based on the above device, the present invention also provides a method for plugging and preventing leakage of a pipe well passing through a bottom plate, which specifically includes the following steps: Step 1: pre-install the anti-seepage casing 1; Step 2: Divide the order of shutting down the pipe wells; divide pipe well 004 into the first stage of plugging and the second stage of plugging; Step 3: Preliminary inspection and preparation; clean and inspect the pipe well 004 blocked in the second stage; Step 4: Install a plugging device; the plugging device includes a bottom tray 4, a reinforcing rib, a pump pipe valve 9, a secondary grouting pipe 7 and a secondary grouting valve 10; Step 5: Fix the bottom tray 4 and the reinforcement ribs; Step 6: injecting the primary plugging material 11 into the tube well 004 plugged in the second stage; Step 7: plugging the pipe well 004 plugged in the first stage; Step 8: Install a primary grouting pipe 13 on the pipe well 004 blocked in the second stage; Step 9: For the pipe well 004 blocked in the second stage, filler material is injected from the primary grouting pipe 13 into the water pump drainage pipe 006; Step 10: injecting filling material from the secondary grouting pipe 7 into the pipe well 004 blocked in the second stage; Step 11: injecting secondary plugging material 12 into the pipe well 004 plugged in the second stage; Step 12: Install the encapsulating waterproof material 16 on the pipe well 004 blocked in the second stage.

[0035] Specifically, in step 1, if Figure 7 As shown, for all pipe wells 004, before the construction of the structural bottom plate 001, an anti-seepage casing 1 must be prepared, and the anti-seepage casing 1 is sleeved on the wellhead of the pipe well 004. After the anti-seepage casing 1 and the outer water stop ring 2 are installed, they are poured into the material of the structural bottom plate 001 to complete the pre-embedded work, and the water pump drainage pipe 006 and the water pump cable 007 are passed through the anti-seepage casing 1 and fixed on the top of the anti-seepage casing 1, and then the water pump 005 is continuously pumping water.

[0036] In step 2, after the underground structure is completed, when it is necessary to stop the dewatering work of pipe well 004 and seal pipe well 004, first check the operation status and water level depth of all pipe wells 004 within the bottom plate range, sort out and classify all pipe wells 004 according to their operation status and location distribution, and include pipe wells 004 with poor operation status, close neighbors, and higher bottom plate top elevations, as well as some observation wells and spare wells in the first stage of sealing, and pipe wells 004 with good operation status, far neighbors, and lower bottom plate top elevations are included in the second stage of sealing.

[0037] In step 3, if Figure 7 As shown, for the second-stage plugged pipe well 004, the stains and rust inside the previously embedded anti-seepage casing 1 should be cleaned, and the bottom tray 4, sealing ring 6, expansion water stop strip 5, well-shaped reinforcement rib 8, pump pipe valve 9, secondary grouting pipe 7 and secondary grouting valve 10 and other plugging devices should be processed and prepared according to the parameters such as the length and diameter of the anti-seepage casing 1. Check the operation of the water pump 005, and debug and replace the water pump 005 in poor operation in advance.

[0038] In step 4, if Figure 8As shown, the water pump 005 and the water pump drainage pipe 006 in the pipe well 004 blocked in the second stage are lifted up to a certain height in sequence, and the bottom tray 4, sealing ring 6, expansion water stop strip 5, well-shaped reinforcement rib 8, pump pipe valve 9, secondary grouting pipe 7 and secondary grouting valve 10 are installed on the outer side of the upper part of the water pump drainage pipe 006. The bottom tray 4 is installed outside the water pump drainage pipe 006, and its vertical position is slightly upward from the bottom of the anti-seepage casing 1. The bottom tray 4 is tightly connected to the water pump drainage pipe 006, and the outer diameter of the bottom tray 4 is slightly smaller than the inner diameter of the anti-seepage casing 1. The edge of the bottom tray 4 has an annular inward groove, and an expansion water stop strip 5 is installed in the inward groove. After the expansion water stop strip 5 expands in volume when it encounters water, it can fill the annular gap between the edge of the bottom tray 4 and the inner wall of the anti-seepage casing 1. A sealing ring 6 is installed on the upper edge of the bottom tray 4. The outer diameter of the sealing ring 6 is slightly larger than the inner diameter of the anti-seepage casing 1. It is made of semi-rigid material and can completely fill the annular gap between the edge of the bottom tray 4 and the inner wall of the anti-seepage casing 1 to ensure that the primary plugging material 11 will not fall into the lower part of the pipe well 004. The well-shaped reinforcement rib 8 is installed on the position of the water pump drainage pipe 006 above the bottom tray 4. The middle of the well-shaped reinforcement rib 8 is firmly installed around the water pump drainage pipe 006, and the end is bent into an L shape.

[0039] The pump pipe valve 9 is installed on the water pump drainage pipe 006, on the top of the bottom tray 4 and the well-shaped reinforcement rib 8, and below the top of the vertical anti-seepage casing 1. The water pump drainage pipe 006 is installed on the top of the pump pipe valve 9 and connected to the existing drainage system.

[0040] The secondary grouting pipe 7 is installed through the bottom tray 4, tightly connected with the bottom tray 4, parallel to the water pump drainage pipe 006 in the vertical direction, extending out of the top of the anti-seepage casing 1, and the lower part of the secondary grouting pipe 7 passes through and protrudes below the bottom surface of the bottom tray 4. The secondary grouting valve 10 is installed on the upper part of the secondary grouting pipe 7. The inner diameter of the secondary grouting pipe 7 and the secondary grouting valve 10 is larger than the outer diameter of the water pump cable 007, and the water pump cable 007 can pass through the secondary grouting pipe 7 and the secondary grouting valve 10. The height of the secondary grouting valve 10 is lower than the top of the anti-seepage casing 1, that is, it is installed inside the anti-seepage casing 1.

[0041] The water pump cable 007 is passed through the secondary grouting pipe 7 and the secondary grouting valve 10 from the inside, extended above the floor surface layer 003 and connected to the existing power supply system. In step 5, if Fig. 9As shown, after the installation work of step 4 is completed, the water pump 005 and the water pump drainage pipe 006 of the pipe well 004 blocked in the second stage are slowly lowered, and the bottom tray 4, pump pipe valve 9, secondary grouting pipe 7 and other special blocking devices are completely placed inside the anti-seepage casing 1. To adjust the vertical height, the bottom tray 4 needs to be above the bottom of the anti-seepage casing 1, and the pump pipe valve 9 and the secondary grouting valve 10 need to be below the top of the anti-seepage casing 1. Check the sealing fit between the sealing ring 6 and the inside of the anti-seepage casing 1, and fill any larger gaps. Tightly fix the bent section at the end of the well-shaped reinforcement rib 8 to the inner wall of the anti-seepage casing 1. Start the water pump 005 to check the operation of the water pump.

[0042] In step 6, if Fig.10 As shown, after the second-stage plugged tube well water pump 005 is checked to be running well, the water pump 005, pump pipe valve 9, and secondary grouting valve 10 are gradually closed in sequence. The primary plugging material 11 is poured from the top of the anti-seepage casing 1 to the inside of the anti-seepage casing 1 and the upper part of the bottom tray 4, and vibrated to be dense. The primary plugging material submerges the well-shaped reinforcement rib 8, but the pouring height does not exceed the bottom of the pump pipe valve 9 and the secondary grouting valve 10. The primary plugging material 11 completely fits and fixes the bottom tray 4, water pump drainage pipe 006, secondary grouting pipe 7, well-shaped reinforcement rib 8 and the inner wall of the anti-seepage casing 1 together, forming a rigid plug body that can resist the head pressure of the groundwater level recovery and rise.

[0043] After the initial plugging material 11 is poured, the water pump 005 is kept closed and left to stand for a period of time to prevent the vibration of the water pump 005 from affecting the complete solidification of the initial plugging material 11. After the initial plugging material 11 solidifies, the water pump 005 is restarted to carry out normal precipitation to ensure that the groundwater level is at a safe water level below the structural bottom plate 001, so as to facilitate the other pipe wells 004 in the second stage of plugging to shut down the water pump 005 and install the plugging device.

[0044] Repeat the above steps 4 to 6 to complete the installation of the plugging devices for all the second-stage plugged pipe wells 004 and the injection of the primary plugging material 11. Since the pipe wells 004 and water pumps 005 in the adjacent second-stage plugging are in continuous operation, the groundwater level is always below the structural bottom plate 001, so the primary plugging material 11 is left to condense in a dry, pressureless and vibration-free environment, and can completely condense the water pump drainage pipe 006, the bottom tray 4, the well-shaped reinforcement ribs 8, the anti-seepage casing 1, and the structural bottom plate 001 together.

[0045] In step 7, if Fig.11As shown, after the first plugging material 11 of the pipe well 004 plugged in the second stage is fully poured, the water pumps 005 of the pipe well 004 plugged in the second stage are all started to reduce water with all efforts to control the groundwater level below the structural bottom plate 001. The pipe well 004 plugged in the first stage is plugged. The pipe well 004 plugged in the first stage adopts a conventional plugging method. First, the water pump 005 and the water pump drainage pipe 006 in the pipe well are lifted out of the well, and then the plugging materials such as crushed stone 17 and medium-coarse sand 18 are backfilled in the well from bottom to top. These plugging materials are backfilled below the structural bottom plate 001. An inner water stop ring 3 is installed inside the anti-seepage casing 1, and the inner water stop ring 3 is tightly connected to the inner wall of the anti-seepage casing 1.

[0046] The same concrete 19 as the structural bottom plate 001 is poured inside the anti-seepage casing 1, and the concrete 19 completely seals and condenses the inner water stop ring 3 and the inner wall of the anti-seepage casing 1. The function of the inner water stop ring 3 is to prevent groundwater from penetrating upward into the underground structure along the tiny gap between the inner wall of the anti-seepage casing 1 and the concrete 19 soil.

[0047] After the concrete 19 is completely solidified, the top sealing plate 15 is installed on the top of the anti-seepage casing 1. The top sealing plate 15 is tightly connected to the top of the anti-seepage casing 1. The encapsulating waterproof material 16 is wrapped around the exposed upper part of the anti-seepage casing 1 and the top sealing plate 15. The bottom of the encapsulating waterproof material 16 is firmly attached to the outer wall of the anti-seepage casing 1. The hydrophobic layer 002 and the floor surface layer 003 on the structural bottom plate 001 are restored, and the first stage of the plugging of the pipe well 004 is completed in sequence.

[0048] Wait until all the pipe wells 004 blocked in the first stage are blocked and the blocking materials are completely solidified. Close the water pumps 005, pump pipe valves 9, secondary grouting valves 10, etc. of all the pipe wells 004 blocked in the second stage, let the groundwater rise slowly and gradually submerge the structural bottom plate 001, closely check the leakage and seepage of the underground structure, and mark the leakage points. After all the leakage points are exposed, restart the water pumps 005 and pump pipe valves 9 of the pipe wells 004 blocked in the second stage, let the groundwater gradually drop below the structural bottom plate 001, and properly block the previously marked leakage points in a dry and pressureless condition. After all the leakage points are handled, shut down the water pumps 005 and pump pipe valves 9 of the pipe wells 004 blocked in the second stage again, let the groundwater rise slowly again, and inspect the leakage points. Repeat the above process until all the leakage points are properly handled.

[0049] In step 8, as shown in the attached Fig.12As shown, after all the leakage points are properly handled, the water pumps 005 and pump pipe valves 9 of all the second-stage blocked pipe wells 004 are closed, the water pump drainage pipe 006 on the pump pipe valve 9 is removed, and a primary grouting pipe 13 is installed on the pump pipe valve 9. Prepare the filling slurry 14, the density of which needs to be greater than the density of groundwater and has good fluidity. The filling slurry 14 injection facility is connected to the primary grouting pipe 13. Remove the water pump cable 007 on the secondary grouting valve 10, and discard the remaining water pump cable 007 along the inner wall of the secondary grouting pipe 7 into the pipe well, and close the secondary grouting valve 10. Pass the water pump cable 007 along the secondary grouting pipe 7 and discard it into the pipe well 004 through the secondary grouting pipe 7, which can prevent groundwater from penetrating into the underground structure along the gap between the outer wall of the water pump cable 007 and the inner wall of the secondary grouting pipe 7, and reduce the risk of water leakage in the future use and operation stage of the underground structure.

[0050] In step 9, if Fig.13 As shown, after the filling slurry 14 is prepared, for the pipe well 004 blocked in the second stage, the pump pipe valve 9 is opened in turn, and the filling slurry 14 is pressure-injected into the water pump drainage pipe 006 along the primary grouting pipe 13. The injection pressure of the filling slurry 14 is greater than the groundwater pressure at the bottom of the pipe well 004. The filling slurry 14 flows along the inside of the water pump drainage pipe 006 and overflows from the water inlet of the water pump 005 at the bottom of the pipe well 004. Since the density of the filling slurry 14 is greater than the density of the groundwater in the pipe well 004, the filling slurry 14 will be deposited at the bottom of the pipe well 004. As the filling slurry 14 continues to overflow from the water inlet of the water pump 005, the filling slurry 14 will gradually fill the entire pipe well 004 from the bottom of the pipe well 004 upwards, and press the groundwater inside the pipe well 004 into the stratum outside the pipe well 004. After the injection volume of the filling slurry 14 is greater than the internal volume of the pipe well 004, the secondary grouting valve 10 is opened to discharge the residual gas and water in the pipe well 004 from the secondary grouting pipe 7, release the internal pressure of the pipe well 004, and continue to inject the filling slurry 14 into the pipe well 004 from the primary grouting pipe 13 until the filling slurry 14 continues to overflow from the secondary grouting pipe 7.

[0051] In step 10, if Fig.14As shown, for the pipe well 004 blocked in the second stage, in order to ensure that the filling slurry 14 fills the entire pipe well 004, after the filling slurry 14 overflows from the secondary grouting pipe 7, the pump pipe valve 9 is closed, and the filling material is stopped from being injected into the pipe well 004 from the primary grouting pipe 13. Instead, the filling slurry 14 is reversely injected from the secondary grouting pipe 7 into the pipe well 004. After the injection pressure of the filling slurry 14 continues to increase, the pump pipe valve 9 is opened to discharge the air and water remaining in the water pump drainage pipe 006 from the primary grouting pipe 13, release the internal pressure of the pipe well 004 and the water pump drainage pipe 005, and continue to inject the filling slurry 14 from the secondary grouting pipe 7 into the pipe well 004 until the filling slurry continues to overflow from the primary grouting pipe 13, indicating that the inside of the pipe well 004, the water pump 005, the water pump drainage pipe 006, and the inside of the secondary grouting pipe 7 are completely filled and dense with the filling slurry 14. Stop injecting the filling slurry 14 from the secondary grouting pipe 7, and close the pump pipe valve 9 and the secondary grouting valve 10.

[0052] In step 11, if Fig.15 As shown, for the second-stage plugged pipe well 004, after the injection of the filling slurry 14 is completed, an inner water stop ring 3 is installed on the upper part of the primary plugging material 11, below the top of the anti-seepage casing 1, and on the inner wall of the anti-seepage casing 1, and the inner water stop ring 3 is tightly connected to the inner wall of the anti-seepage casing 1.

[0053] Remove the primary grouting pipe 13 above the pump pipe valve 9, and remove the secondary grouting pipe 7 above the secondary grouting valve 10. Roughen the top surface of the primary plugging material 11 solidification body, clean it, pour the secondary plugging material 12 and fill the entire anti-seepage casing 1, and completely submerge the inner water stop ring 3, pump pipe valve 9, and secondary grouting valve 10 in the secondary plugging material 12. After the secondary plugging material 12 is completely solidified, install the top sealing plate 15 on the top of the anti-seepage casing 1, and the top sealing plate 15 is tightly connected to the top of the anti-seepage casing 1.

[0054] In step 12, if Fig.16 As shown, for the pipe well 004 blocked in the second stage, the encapsulating waterproof material 16 is wrapped and wound around the exposed upper part of the anti-seepage casing 1 and the top sealing plate 15, and the bottom of the encapsulating waterproof material 16 is firmly adhered to the outer wall of the anti-seepage casing 1. The hydrophobic layer 002 and the floor surface layer 003 on the structural bottom plate 001 are restored, thus completing the blocking and anti-seepage treatment of the entire pipe well 004.

Claims

1. A plugging device for a pipe well passing through a bottom plate, comprising a water pump (005) arranged at the bottom of the pipe well (004), wherein the water pump (005) is connected to a water pump drainage pipe (006) and a water pump cable (007), characterized in that: The device also includes an anti-seepage casing (1), a bottom tray (4), a secondary grouting pipe (7), a pump pipe valve (9), and a primary grouting pipe (13); The anti-seepage casing (1) is sleeved on the wellhead of the pipe well (004) and pre-installed in the structural bottom plate (001); the outer wall of the anti-seepage casing (1) is provided with an outer water stop ring (2), and an inner water stop ring (3) is installed inside; The bottom tray (4) is installed on the water pump drainage pipe (006), its inner ring is sealedly connected to the water pump drainage pipe (006), its outer edge is sealedly connected to the inner wall of the anti-seepage casing (1), and a reinforcing rib is provided on the water pump drainage pipe (006) located on the upper part of the bottom tray (4); The secondary grouting pipe (7) is installed on the bottom tray (4), the lower part of which passes through the bottom tray (4) and is tightly connected to the bottom tray (4), and the upper part of which extends out of the top of the anti-seepage casing (1) and is connected to the secondary grouting valve (10); The pump pipe valve (9) is installed on the upper part of the water pump drainage pipe (006), and the upper part thereof is detachably connected to a primary grouting pipe (13); The anti-seepage casing (1) is filled with primary plugging material (11) and secondary plugging material (12) from bottom to top; and the water pump drainage pipe (006), the secondary grouting pipe (7), and the pipe well (004) are filled with filling slurry (14).

2. A plugging device for a pipe well passing through a bottom plate according to claim 1, characterized in that: The reinforcing ribs are well-shaped reinforcing ribs (8), the ends of which are bent into an L-shape and fixed to the inner wall of the anti-seepage casing (1).

3. The device for plugging a pipe well through a bottom plate according to claim 1, characterized in that: The outer water stop ring (2) is sealedly connected to the outer wall of the anti-seepage casing (1) and cast in the structural bottom plate (001), forming a whole with the structural bottom plate (001).

4. A plugging device for a pipe well passing through a bottom plate according to claim 1, characterized in that: The water pump cable (007) passes through the interior of the secondary grouting pipe (7) and is connected to the water pump (005).

5. The device for plugging a pipe well through a bottom plate according to claim 1, characterized in that: The bottom tray (4) has an inward groove at its edge, an expansion water stop strip (5) is installed in the inward groove, a sealing ring (6) is installed at the upper part of the edge of the bottom tray (4), and the bottom tray (4) is sealed and connected to the anti-seepage sleeve (1) via the sealing ring (6).

6. A method for plugging and preventing leakage of a pipe well passing through a bottom plate, characterized in that: The use of a bottom plate pipe well plugging device as claimed in claim 1 specifically comprises the following steps: Step 1: Pre-install the anti-seepage casing (1); Step 2: Divide the shut-down sequence of the pipe wells; divide the pipe wells (004) into the pipe wells (004) plugged in the first stage and the pipe wells (004) plugged in the second stage; Step 3: Preliminary inspection and preparation; clean and inspect the pipe well (004) blocked in the second stage; Step 4: installing a plugging device; the plugging device comprises a bottom tray (4), reinforcing ribs, a pump pipe valve (9), a secondary grouting pipe (7) and a secondary grouting valve (10); Step 5: Fix the bottom tray (4) and the reinforcement ribs; Step 6: injecting the primary plugging material (11) into the tube well (004) plugged in the second stage; Step 7: plugging the tube well (004) plugged in the first stage; Step 8: Install a primary grouting pipe (13) on the pipe well (004) blocked in the second stage; Step 9: For the pipe well (004) blocked in the second stage, inject filling slurry (14) from the primary grouting pipe (13) into the water pump drainage pipe (006); Step 10: injecting filling slurry (14) from the secondary grouting pipe (7) into the pipe well (004) plugged in the second stage; Step 11: injecting secondary plugging material (12) into the tube well (004) plugged in the second stage; Step 12: Install the encapsulating waterproof material (16) on the pipe well (004) blocked in the second stage.

7. A method for blocking and preventing leakage of a pipe well passing through a bottom plate according to claim 6, characterized in that: In the step 1, the anti-seepage casing (1) is sleeved on the wellhead of the pipe well (004), an outer water stop ring (2) is installed on the outside of the anti-seepage casing (1), the outer water stop ring (2) and the anti-seepage casing (1) are tightly connected and cast together in the material of the structural base plate (001), and the water pump drainage pipe (006) and the water pump cable (007) are passed through the anti-seepage casing (1) and fixed on the top of the anti-seepage casing (1), so that the water pump (005) can continue to pump water; In step 2, the operation status and water level depth of all the pipe wells (004) within the bottom plate range are checked, and according to the operation status and location distribution of the pipe wells (004), a part of the pipe wells (004) are included in the first stage of plugging, and another part of the pipe wells (004) are included in the second stage of plugging; In the step 3, the dirt and rust inside the anti-seepage casing (1) are cleaned for the pipe well (004) blocked in the second stage; In the step 4, the water pump (005) and the water pump drainage pipe (006) inside the pipe well (004) blocked in the second stage are lifted up to a certain height, and a bottom tray (4), a well-shaped reinforcement rib (8), a pump pipe valve (9), a secondary grouting pipe (7) and a secondary grouting valve (10) are installed on the outer side of the upper part of the water pump drainage pipe (006); In step 5, the water pump (005) and the water pump drainage pipe (006) of the pipe well (004) blocked in the second stage are slowly lowered, the bottom tray (4), the pump pipe valve (9), and the secondary grouting pipe (7) are completely placed inside the anti-seepage casing (1), and the bent section at the end of the well-shaped reinforcement rib (8) is tightly fixed to the inner wall of the anti-seepage casing (1); In the step 6, the water pump (005), the pump pipe valve (9), and the secondary grouting valve (10) in the second-stage blocked pipe well (004) are closed in sequence, and the primary blocking material (11) is poured into the interior of the anti-seepage casing (1) and the upper part of the bottom tray (4). After the primary blocking material (11) in the second-stage blocked pipe well (004) is completely poured, all the water pumps (005) are started; In step 7, the water pump (005) and the water pump drainage pipe (006) of the pipe well (004) blocked in the first stage are lifted out of the well, and then the blocking material is backfilled in the well from bottom to top to below the structural bottom plate (001), and an inner water stop ring (3) is installed inside the anti-seepage casing (1); the same concrete (19) as the structural bottom plate (001) is poured inside the anti-seepage casing (1), and after the concrete (19) solidifies, the top sealing plate (15) is installed on the top of the anti-seepage casing (1), the top sealing plate (15) is tightly connected to the top of the anti-seepage casing (1), and the encapsulating waterproof material (16) is wrapped and wound around the upper part of the exposed anti-seepage casing (1) and the top sealing plate (15), and the bottom of the encapsulating waterproof material (16) is firmly adhered to the outer wall of the anti-seepage casing (1), and the hydrophobic layer (002) and the floor surface layer (003) on the structural bottom plate (001) are restored; In the step 8, the water pumps (005) and pump pipe valves (9) of all the pipe wells (004) blocked in the second stage are closed, a primary grouting pipe (13) is installed on the pump pipe valve (9), and the secondary grouting valve (10) is closed; In the step 9, for the pipe well (004) blocked in the second stage, the pump pipe valve (9) is opened in sequence, and the filling slurry (14) is pressure-injected into the water pump drainage pipe (006) along the primary grouting pipe (13), and the secondary grouting valve (10) is opened at the same time to discharge the gas and water remaining in the pipe well (004) from the secondary grouting pipe (7), and the filling slurry (14) is continuously injected from the primary grouting pipe (13) into the pipe well (004) until the filling slurry (14) continuously overflows from the secondary grouting pipe (7); In the step 10, for the pipe well (004) blocked in the second stage, a filling slurry (14) is reversely injected from the secondary grouting pipe (7) into the pipe well (004); at the same time, the pump pipe valve (9) is opened to discharge the air and water remaining in the water pump drainage pipe (006) from the primary grouting pipe (13); In the step 11, for the pipe well (004) to be plugged in the second stage, an inner water stop ring (3) is installed on the inner wall of the anti-seepage casing (1) and a secondary plugging material (12) is poured, the inner water stop ring (3), the pump pipe valve (9), and the secondary grouting valve (10) are completely submerged and sealed in the secondary plugging material (12), and a top sealing plate (15) is installed on the top of the anti-seepage casing (1); In step 12, for the pipe well (004) blocked in the second stage, the encapsulating waterproof material (16) is wrapped and wound around the upper part of the exposed anti-seepage casing (1) and the top sealing plate (15), and the hydrophobic layer (002) and the floor surface layer (003) on the structural bottom plate (001) are restored.

8. A method for blocking and preventing leakage of a pipe well passing through a bottom plate according to claim 7, characterized in that: In step 4, the middle of the well-shaped reinforcement rib (8) is firmly installed around the water pump drainage pipe, and the ends are bent into an L shape. The bent portion is tightly fixed to the inner wall of the anti-seepage casing (1) and is encapsulated together when the initial plugging material (11) is poured.

9. A method for blocking and preventing leakage of a pipe well passing through a bottom plate according to claim 7, characterized in that: In step 4, when installing the bottom tray (4), an expansion water stop strip (5) is installed in the annular inward groove at the edge of the bottom tray (4), and a sealing ring (6) is installed on the upper part of the annular inward groove at the edge of the bottom tray (4).

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