A well sealing device and method for pressure dewatering well

Abstract

The invention discloses a well sealing device and method for a pressure-bearing dewatering well, comprising a bottom plate, having a bottom plate tongue and groove, and provided with a fan-shaped water-blocking steel plate; a dewatering well pipe, provided with a well sealing steel plate, and a side wall provided with a water-stop ring wing; an outer pipe of the well sealing device, sleeved in the well pipe of the dewatering well; an inner pipe of the well sealing device, sleeved in the outer pipe of the well sealing device, having an inner pipe drainage hole at the lower end, and being fixed by the inner pipe limiting steel plate; an inner pipe water-stopping strip clamping groove, arranged between the outer pipe of the well sealing device and the inner pipe of the well sealing device, and having an inner pipe water-stopping strip; and a bottom plate steel plate, arranged at the lower end of the outer pipe of the sealing device, having a bottom plate water-permeable hole, and having a bottom plate water-stopping strip clamping groove and a bottom plate water-stopping strip at both ends; and a water-blocking plate, arranged between the bottom plate steel plate and the inner pipe limiting steel plate. It has the advantages of realizing continuous well sealing, providing sufficient time for concrete solidification, and ensuring that the well is sealed successfully once.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing and foundation pit dewatering, and in particular to a well sealing device for a pressure dewatering well. Background Art

[0002] At present, with the continuous excavation and development of urban underground space, deep foundation pit projects are becoming more and more common, and the depth of foundation pits is getting larger and larger. The sealing of deep foundation pit dewatering wells, especially pressure dewatering wells, has become a key link in the construction of the entire underground structure. It directly affects the waterproofing of the project and whether the subsequent construction can proceed smoothly. However, in terms of well sealing construction, the practices of various design units and construction units are not unified, and there is no standard practice in the industry. Construction units generally seal wells according to the design drawings of the design institute, or seal them themselves based on experience.

[0003] In the prior art, most construction units adopt the following measures: after the foundation pit bottom plate is poured, a large amount of water is first pumped out of the precipitation well, and then clay balls are first filled into the precipitation well using the gap of the groundwater level rising, and then concrete is filled in, and the filling is compacted while it is filled, and finally the steel plate is placed and welded to the well pipe. This approach is effective for precipitation wells with a small pressure head and a slow groundwater recovery rate. However, it is not applicable to precipitation wells with a large pressure head or a fast groundwater recovery rate. Under the impact of groundwater before the clay ball settles and the concrete solidifies, the well sealing will fail. In order to gain construction time, some construction units abandon the water pump and seal the water pump into the well together. The traditional well sealing method uses clay balls and concrete filling. When the head difference of the precipitation well is large and the water pressure is high, the time for clay ball filling and concrete filling is very limited. Before the concrete solidifies, it is washed away by groundwater, resulting in the failure of well sealing.

[0004] In summary, the traditional well sealing method uses clay balls and concrete filling. When the water head difference in the precipitation well is large and the water pressure is high, the time for clay ball filling and concrete filling is very limited. Before the concrete solidifies, it will be washed away by groundwater, resulting in well sealing failure. Summary of the invention

[0005] The main purpose of the present invention is to provide a sealing device and method for a pressurized dewatering well, so as to solve the problem that the traditional well sealing method in the prior art uses clay balls and concrete filling. When the water head difference and water pressure of the dewatering well are large, the time for clay ball filling and concrete filling is very limited. Before the concrete solidifies, it is washed away by groundwater, resulting in failure of well sealing.

[0006] In order to achieve the above object, according to one aspect of the present invention, a sealing device for a pressure dewatering well is provided, comprising:

[0007] The bottom plate has a bottom plate tongue and groove and is provided with a fan-shaped water-proof steel plate;

[0008] The well pipe of the precipitation well is equipped with a sealing steel plate and a water-stop ring wing on the side wall;

[0009] The outer pipe of the well sealing device is sleeved in the well pipe of the precipitation well;

[0010] The inner tube of the well sealing device is sleeved in the outer tube of the well sealing device, has an inner tube drainage hole at the lower end, and is fixed by the inner tube limiting steel plate;

[0011] An inner tube water stop strip clamping groove is provided between the outer tube of the well sealing device and the inner tube of the well sealing device, and has an inner tube water stop strip; and

[0012] The bottom plate steel plate is arranged at the lower end of the outer tube of the sealing device, has a bottom plate water-permeable hole, and is provided with a bottom plate water-stop strip groove and a bottom plate water-stop strip at both ends;

[0013] The water-blocking plate is arranged between the bottom steel plate and the inner tube limiting steel plate.

[0014] Preferably, the fourth micro-expansive concrete is poured in the groove of the bottom plate; the third micro-expansive cement is poured in the upper section of the precipitation well pipe; quick-drying cement is poured between the lower section of the precipitation well pipe and the outer tube of the well sealing device, and the first micro-expansive concrete is poured between the middle section of the precipitation well pipe and the outer tube of the well sealing device; the second micro-expansive concrete is poured in the outer tube and the inner tube of the well sealing device.

[0015] Preferably, the water-stop ring wings are arranged in pairs, the water-stop ring wings are connected to the side walls of the precipitation well pipe by welding, and the water-stop ring wings are made of patterned steel plates.

[0016] Preferably, the outer tube of the well sealing device and the inner tube of the well sealing device are cut to be flush with the bottom of the base plate, and the well pipe of the dewatering well is cut to be flush with the lower end of the tongue and groove of the base plate.

[0017] Preferably, a pair of well-sealing steel plates are welded inside the well pipe of the precipitation well, and a third micro-expansive concrete is poured between the pair of well-sealing steel plates.

[0018] Preferably, when groundwater is continuously pumped out through the inner tube of the well sealing device, and there is no water or very little water and no water pressure between the outer tube of the well sealing device and the well pipe of the precipitation well, quick-drying cement is filled between the bottom end of the outer tube of the well sealing device and the well pipe of the precipitation well to seal it.

[0019] Preferably, a water pump pipe is connected above the inner tube of the well sealing device, and the water pump pipe is connected to a water pump, and the water pump pumps out groundwater.

[0020] Preferably, an inner tube drainage hole is provided at the lower end of the inner tube of the well sealing device, and the inner tube drainage hole guides groundwater to be discharged upward from the bottom plate water-permeable holes through the inner tube drainage hole.

[0021] Preferably, the side wall of the outer tube of the well sealing device is provided with bolts.

[0022] According to another aspect of the present invention, a method for sealing a pressure dewatering well is provided, comprising:

[0023] The groundwater is guided to drain upward from the bottom plate water-permeable hole through the inner pipe drainage hole at the lower end of the inner pipe. The upper part of the inner pipe of the sealing well device is connected to a water pump pipe and then to a water pump, and the groundwater is continuously pumped out through the water pump.

[0024] Groundwater is continuously pumped out through the inner pipe of the sealing device, and there is no water between the outer pipe of the sealing device and the well pipe of the precipitation well, or there is very little water and no water pressure. At this time, quick-drying cement is filled between the bottom of the outer pipe and the well pipe of the precipitation well to further seal it;

[0025] After the concrete between the outer tube of the well sealing device and the well pipe of the dewatering well has formed strength, the inner tube of the well sealing device is rotated to seal the bottom plate water-permeable holes on the bottom plate steel plate using the fan-shaped water-blocking plate to seal the groundwater, and after the water in the inner tube of the well sealing device is drained, the second micro-expansive concrete is immediately poured in until it is flush with the bottom of the bottom plate;

[0026] Cut the outer pipe and inner pipe of the well sealing device to be flush with the bottom of the bottom plate, and cut the well pipe of the drainage well to be flush with the lower end of the bottom plate groove;

[0027] The first sealing steel plate is welded in the well pipe of the precipitation well, the first sealing steel plate is close to the poured sealing concrete, the third micro-expansion concrete is poured on the first sealing steel plate, and then the second sealing steel plate is welded;

[0028] After the welding of the second sealing steel plate is completed, the fourth micro-expansion concrete is poured at the tongue and groove position of the bottom plate.

[0029] The application of the technical solution of the present invention has the following technical effects:

[0030] The method for sealing a pressure dewatering well provided by the present invention overcomes the shortcomings of imperfect traditional pressure dewatering well sealing technology and low one-time success rate in foundation pit construction, and proposes a sealing plan based on the specific conditions of the pressure dewatering well in the foundation pit project, with clear operating steps, simplicity and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 A schematic structural diagram of a well sealing device for a pressure dewatering well according to the present invention is shown;

[0033] Figure 2 Shows Figure 1 Structural view of the well pipe concrete pouring of the sealing device of the pressure dewatering well;

[0034] Figure 3 Shows Figure 1 Structural view of the implementation of inner tube concrete pouring of the sealing device of the pressure dewatering well;

[0035] Figure 4 Shows Figure 1 A structural view of a well sealing device for a pressure dewatering well in which the dewatering well is sealed;

[0036] Figure 5 Shows Figure 1 A cross-sectional view of the sealing device of the pressure dewatering well in the aa direction;

[0037] Figure 6 Shows Figure 1 A cross-sectional view of the sealing device of the pressure dewatering well in the bb direction;

[0038] Figure 7 Shows Figure 1 A cc-direction cross-sectional view of a well sealing device for a pressure dewatering well;

[0039] Figure 8 Shows Figure 1 A cross-sectional view of the sealing device of the pressure dewatering well in the dd direction;

[0040] Fig. 9 Shows Figure 1 Structural view of the inner tube drainage hole of the sealing device for the pressurized dewatering well.

[0041] The above drawings include the following reference numerals:

[0042] Well pipe of precipitation well 1; bottom plate groove 2; water stop ring wing 3; bolt 4; outer pipe of well sealing device 5; inner pipe water stop strip slot 6; inner pipe water stop strip 7; bottom plate water stop strip 8; bottom plate water stop strip slot 9; inner pipe of well sealing device 10; inner pipe drainage hole 11; inner pipe limiting steel plate 12; bottom plate connecting bolt 13; bottom plate adjusting bolt 14; bottom plate water permeable hole 15; bottom plate steel plate 16; water-blocking board 17; quick-drying cement 18; first micro-expansive concrete 19; second micro-expansive concrete 20; third micro-expansive concrete 21; well sealing steel plate 22; fourth micro-expansive concrete 23; fan-shaped water-blocking steel plate 24. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] like Figures 1 to 9As shown, an embodiment of the present invention provides a well sealing device for a pressurized dewatering well, comprising a bottom plate having a bottom plate groove 2 and a fan-shaped water-blocking steel plate 24; a dewatering well pipe 1, provided with a well sealing steel plate 22, and a side wall provided with a water-stop ring wing 3; an outer pipe 5 of the well sealing device, sleeved in the dewatering well pipe 1; an inner pipe 10 of the well sealing device, sleeved in the outer pipe 5 of the well sealing device, with an inner pipe drainage hole 11 at the lower end, and fixed by an inner pipe limiting steel plate 12; an inner pipe water-stop strip groove 6, arranged between the outer pipe 5 of the well sealing device and the inner pipe 10 of the well sealing device, with an inner pipe water-stop strip 7; a bottom plate steel plate 16, arranged at the lower end of the outer pipe 5 of the sealing device, with a bottom plate water-permeable hole 15, and a bottom plate water-stop strip groove 9 and a bottom plate water-stop strip 8 are circumferentially arranged; a water-blocking plate 17, arranged between the bottom plate steel plate 16 and the inner pipe limiting steel plate 12. The present invention can realize continuous well sealing, provide sufficient time for concrete solidification, and ensure that the well sealing is successful at one time.

[0045] In this embodiment, the bottom plate plays an upper supporting role, has a bottom plate groove 2, is provided with a fan-shaped water-proof steel plate 24, the fan-shaped water-proof steel plate 24 is used for waterproofing, the fourth micro-expansion concrete 23 is poured in the bottom plate groove 2, the third micro-expansion cement is poured in the upper section of the precipitation well pipe 1, the quick-drying cement 18 is poured between the lower section of the precipitation well pipe 1 and the outer pipe 5 of the sealing device, the first micro-expansion concrete 19 is poured between the middle section of the precipitation well pipe 1 and the outer pipe 5 of the sealing device; the second micro-expansion concrete 20 is poured in the outer pipe 5 of the sealing device and the inner pipe 10 of the sealing device. The well is sealed by pouring multiple layers of concrete.

[0046] In this embodiment, the well pipe 1 of the precipitation well is used to form an outer casing for sealing the well, and is provided with a sealing steel plate 22, which is used to seal the well. The side wall is provided with a water stop ring wing 3, which is used to stop water. The water stop ring wing 3 is arranged in pairs, and the water stop ring wing 3 is connected to the side wall of the well pipe 1 of the precipitation well by welding. The water stop ring wing 3 is made of a patterned steel plate. Pairs of sealing steel plates 22 are welded in the well pipe 1 of the precipitation well, and the third micro-expansive concrete 21 is poured between the pairs of sealing steel plates 22. The bottom plate steel plate 16 is circumferentially welded with a bottom plate water stop strip groove 9, and a rubber bottom plate water stop strip 8 is installed in the bottom plate water stop strip groove 9. The bottom plate water stop strip 8 will expand rapidly when it encounters water, which plays a role in isolating groundwater. The bottom plate water stop strip 8 is supported and fixed by the bottom plate water stop groove 9.

[0047] In this embodiment, the outer tube 5 of the well sealing device is sleeved in the well pipe 1 of the dewatering well; the outer tube 5 of the well sealing device and the inner tube 10 of the well sealing device are cut to be flush with the bottom of the bottom plate, and the well pipe 1 of the dewatering well is cut to be flush with the lower end of the bottom plate groove 2, and the side wall of the outer tube 5 of the well sealing device is provided with bolts 4. After the concrete between the outer tube 5 of the well sealing device and the well pipe 1 of the dewatering well is formed with strength, the inner tube 10 of the well sealing device is rotated to close the bottom plate water permeable hole 15 on the bottom plate steel plate 16 by using the fan-shaped water baffle 17, and the groundwater can be successfully sealed at this time. After draining the water in the inner tube 10 of the well sealing device, concrete is immediately poured in and poured to the bottom position of the bottom plate. After the concrete between the outer tube 5 of the well sealing device and the well pipe 1 of the precipitation well has formed strength, the inner tube 10 of the rotating well sealing device uses the fan-shaped baffle 17 to seal the bottom plate water-permeable holes 15 on the bottom plate steel plate 16 to seal the groundwater. After draining the water in the inner tube 10 of the well sealing device, the second micro-expansive concrete 20 is immediately poured in until it is flush with the bottom of the bottom plate.

[0048] In this embodiment, the inner tube 10 of the well sealing device is sleeved in the outer tube 5 of the well sealing device, and has an inner tube drainage hole 11 at the lower end, which is fixed by the inner tube limiting steel plate 12; the inner tube drainage hole 11 is set at the lower end of the inner tube 10 of the well sealing device, and the inner tube drainage hole 11 guides the groundwater to be discharged upward from the bottom plate water permeable hole 15 through the inner tube drainage hole 11. The outer tube 5 of the well sealing device and the inner tube 10 of the well sealing device are cut to the bottom of the bottom plate, and the precipitation well pipe 1 is cut to be flush with the lower end of the bottom plate groove 2. The first well sealing steel plate 22 is welded in the precipitation well pipe 1, and the first well sealing steel plate 22 is close to the poured well sealing concrete. The third concrete is poured on the first well sealing steel plate 22, and then the second well sealing steel plate 22 is welded. After the second well sealing steel plate 22 is welded, the fourth micro-expansion concrete 23 is poured at the bottom plate groove 2 position, and the poured concrete uses micro-expansion concrete with a strength one level higher than the designed bottom plate. The groundwater is guided to drain upward from the bottom plate water-permeable holes 15 through the inner tube drainage holes 11 through the inner tube drainage holes 11 at the lower end of the inner tube 10 of the sealing well device. The upper part of the inner tube 10 of the sealing well device is connected to a water pump pipe and then to a water pump, and the groundwater is continuously pumped out by the water pump.

[0049] In this embodiment, the inner tube water stop strip slot 6 is arranged between the outer tube 5 of the well sealing device and the inner tube 10 of the well sealing device, and has an inner tube water stop strip 7. The bottom plate steel plate 16 is connected to the water baffle 17 through the bottom plate adjusting bolt 14, and is connected to the outer tube 5 of the well sealing device through the bottom plate connecting bolt 13. It is arranged at the lower end of the outer tube 5 of the well sealing device, has a bottom plate water permeable hole 15, and the two ends are provided with a bottom plate water stop strip slot 9 and a bottom plate water stop strip 8; the bottom plate water permeable hole 15 is arranged on the bottom plate steel plate 16, and the fan-shaped water baffle 17 avoids the bottom plate water permeable hole 15 at this time, and the inner tube drainage hole 11 is arranged at the lower end of the inner tube 10 of the well sealing device, guiding the groundwater to be discharged upward from the bottom plate water permeable hole 15 through the inner tube drainage hole 11 of the inner tube 10 of the well sealing device, and the upper part of the inner tube 10 of the well sealing device is connected with a water pump pipe to continuously pump out the groundwater. Because groundwater is continuously pumped out through the inner tube 10 of the well sealing device, there is no water between the outer tube 5 of the well sealing device and the well pipe 1 of the precipitation well, or the amount of water is very small and the water has no water pressure. At this time, quick-drying cement 18 is filled between the bottom end of the outer tube 5 of the well sealing device and the well pipe 1 of the precipitation well to further seal it. A first micro-expansive concrete 19 one level higher than the bottom plate is poured above the quick-drying cement 18, and the first expansive concrete is poured to the bottom of the bottom plate. The water-blocking plate 17 is used for water-blocking and is arranged between the bottom plate steel plate 16 and the inner tube limit steel plate 12.

[0050] In this embodiment, when groundwater is continuously pumped out through the inner tube 10 of the well sealing device, and the space between the outer tube 5 of the well sealing device and the precipitation well pipe 1 is in a waterless state or a state with very little water and no water pressure, quick-drying cement 18 is filled between the bottom end of the outer tube 5 of the well sealing device and the precipitation well pipe 1 to seal it. Through the patent of the present invention, continuous well sealing can be achieved, sufficient time is provided for the concrete to solidify, and the well sealing can be ensured to be successful once. During the construction stage of the underground structure, the precipitation well is continuously pumped out, and two water-stopping ring wings 3 are welded to the precipitation well pipe 1 within the range of the bottom plate. The water-stopping ring wings 3 are made of patterned steel plates, and the steel plates are fully welded to the precipitation well pipe 1, and the water-stopping ring wings 3 are cast into the concrete of the bottom plate. The bottom plate of the precipitation well position is set in a tongue-and-groove form, and a galvanized water-stopping steel plate is installed on the bottom plate. The precipitation well water-blocking device is installed on the ground, and the water-blocking device is mainly composed of a bottom plate, an outer tube 5 of the well sealing device, and an inner tube 10 of the well sealing device. Use the water pump in the precipitation well to pump out the water, then quickly take out the water pump, and immediately install the assembled water-blocking device into the precipitation well. In the water-blocking device, the bottom plate steel plate 16 is circumferentially welded with a bottom plate water stop strip groove 9, and a rubber bottom plate water stop strip 8 is installed in the bottom plate water stop strip groove 9. The bottom plate water stop strip 8 will expand rapidly when it encounters water, playing the role of isolating groundwater.

[0051] Another aspect of the present invention provides a method for sealing a pressure dewatering well, comprising the following steps:

[0052] The inner pipe drainage hole 11 at the lower end of the inner pipe guides the groundwater to be discharged upward from the bottom plate water permeable hole 15 through the inner pipe drainage hole 11. The upper part of the inner pipe 10 of the sealing well device is connected to a water pump pipe and then to a water pump, and the groundwater is continuously pumped out by the water pump.

[0053] The groundwater is continuously pumped out through the inner pipe 10 of the sealing device, and there is no water between the outer pipe 5 of the sealing device and the precipitation well pipe 1, or there is very little water and no water pressure. At this time, quick-drying cement 18 is filled between the bottom end of the outer pipe and the precipitation well pipe to further seal it;

[0054] After the concrete between the outer tube 5 of the well sealing device and the well pipe 1 of the precipitation well has formed strength, the inner tube 10 of the well sealing device is rotated to seal the bottom plate water permeable holes 15 on the bottom plate steel plate 16 by using the fan-shaped baffle 17 to seal the groundwater, and after draining the water in the inner tube 10 of the well sealing device, the second micro-expansive concrete 20 is immediately poured in until it is flush with the bottom of the bottom plate;

[0055] Cut the well sealing device outer tube 5 and the well sealing device inner tube 10 to be flush with the bottom of the bottom plate, and cut the drainage well pipe 1 to be flush with the lower end of the bottom plate groove 2;

[0056] A first sealing steel plate 22 is welded in the well pipe 1 of the precipitation well, the first sealing steel plate 22 is close to the poured sealing concrete, a third micro-expansion concrete 21 is poured on the first sealing steel plate 22, and then a second sealing steel plate 22 is welded;

[0057] After the second well-sealing steel plate 22 is welded, the fourth micro-expansion concrete 23 is poured at the bottom plate groove 2 position.

[0058] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0059] The method for sealing a pressure dewatering well provided by the present invention overcomes the shortcomings of imperfect traditional pressure dewatering well sealing technology and low one-time success rate in foundation pit construction. According to the specific conditions of the pressure dewatering well in the foundation pit project, a sealing plan is proposed, which has clear operating steps, is simple and economical, and has great promotion and application value.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealing device for a pressure dewatering well, It is characterized in that include: The bottom plate has a bottom plate tongue and groove and is provided with a fan-shaped water-proof steel plate; The well pipe of the precipitation well is equipped with a sealing steel plate and a water-stop ring wing on the side wall; The outer pipe of the well sealing device is sleeved in the well pipe of the precipitation well; The inner tube of the well sealing device is sleeved in the outer tube of the well sealing device, has an inner tube drainage hole at the lower end, and is fixed by the inner tube limiting steel plate; An inner tube water stop strip clamping groove is provided between the outer tube of the well sealing device and the inner tube of the well sealing device, and has an inner tube water stop strip; and The bottom plate steel plate is arranged at the lower end of the outer tube of the sealing device, has a bottom plate water-permeable hole, and is provided with a bottom plate water-stop strip groove and a bottom plate water-stop strip at both ends; The water-blocking plate is arranged between the bottom plate steel plate and the inner tube limiting steel plate; the water-blocking plate is fan-shaped. When the inner tube of the well-sealing device is rotated, the inner tube of the well-sealing device drives the water-blocking plate to rotate, thereby closing or opening the water-permeable holes of the bottom plate.

2. The sealing device for a pressure dewatering well according to claim 1, It is characterized in that The fourth micro-expansive concrete is poured in the groove of the bottom plate; the third micro-expansive cement is poured in the upper section of the precipitation well pipe; quick-drying cement is poured between the lower section of the precipitation well pipe and the outer tube of the well sealing device, and the first micro-expansive concrete is poured between the middle section of the precipitation well pipe and the outer tube of the well sealing device; the second micro-expansive concrete is poured in the outer tube and the inner tube of the well sealing device.

3. The sealing device for a pressure dewatering well according to claim 1, It is characterized in that The water-stop ring wings are arranged in pairs, and the water-stop ring wings are connected to the side walls of the precipitation well pipe by welding, and the water-stop ring wings are made of patterned steel plates.

4. The sealing device for a pressure dewatering well according to claim 1, It is characterized in that The outer tube of the well sealing device and the inner tube of the well sealing device are cut to be flush with the bottom of the bottom plate, and the well pipe of the dewatering well is cut to be flush with the lower end of the tongue and groove of the bottom plate.

5. The sealing device for a pressure dewatering well according to claim 1, It is characterized in that A pair of well-sealing steel plates are welded inside the well pipe of the precipitation well, and a third micro-expansive concrete is poured between the pair of well-sealing steel plates.

6. The sealing device for a pressure dewatering well according to claim 1, It is characterized in that When groundwater is continuously pumped out through the inner tube of the well sealing device, and there is no water or very little water and no water pressure between the outer tube of the well sealing device and the well pipe of the precipitation well, quick-drying cement is filled between the bottom end of the outer tube of the well sealing device and the well pipe of the precipitation well to seal it.

7. The sealing device for a pressure dewatering well according to claim 1, It is characterized in that A water pump pipe is connected above the inner pipe of the well sealing device, and the water pump pipe is connected to a water pump, and the water pump pumps out groundwater.

8. The sealing device for a pressure dewatering well according to claim 1, It is characterized in that An inner tube drainage hole is arranged at the lower end of the inner tube of the well sealing device, and the inner tube drainage hole guides groundwater to be discharged upward from the bottom plate water-permeable hole through the inner tube drainage hole.

9. The sealing device for a pressure dewatering well according to claim 1, It is characterized in that The side wall of the outer tube of the well sealing device is provided with bolts.

10. A method for sealing a pressure dewatering well, based on the sealing device for a pressure dewatering well according to any one of claims 1 to 9, It is characterized in that include: The groundwater is guided to drain upward from the bottom plate water-permeable hole through the inner pipe drainage hole at the lower end of the inner pipe. The upper part of the inner pipe of the sealing well device is connected to a water pump pipe and then to a water pump, and the groundwater is continuously pumped out through the water pump. Groundwater is continuously pumped out through the inner pipe of the sealing device, and there is no water between the outer pipe of the sealing device and the well pipe of the precipitation well, or there is very little water and no water pressure. At this time, quick-drying cement is filled between the bottom of the outer pipe and the well pipe of the precipitation well to further seal it; After the concrete between the outer tube of the well sealing device and the well pipe of the dewatering well has formed strength, the inner tube of the well sealing device is rotated to seal the bottom plate water-permeable holes on the bottom plate steel plate using the fan-shaped water-blocking plate to seal the groundwater, and after the water in the inner tube of the well sealing device is drained, the second micro-expansive concrete is immediately poured in until it is flush with the bottom of the bottom plate; Cut the outer pipe and inner pipe of the well sealing device to be flush with the bottom of the bottom plate, and cut the well pipe of the drainage well to be flush with the lower end of the bottom plate groove; The first well-sealing steel plate is welded inside the well pipe of the precipitation well. The first well-sealing steel plate is close to the poured well-sealing concrete. The third micro-expansion concrete is poured on the first well-sealing steel plate, and then the second well-sealing steel plate is welded. After the welding of the second well-sealing steel plate is completed, the fourth micro-expansion concrete is poured at the tongue and groove position of the bottom plate.

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