CN116356864A - Well sealing device and method for pressure-bearing and pressure-reducing well - Google Patents

Abstract

The invention discloses a well sealing device and a well sealing method for a pressure-bearing and pressure-reducing well, comprising a bottom plate, a water sealing plate and a water sealing plate, wherein the bottom plate is provided with a bottom plate tongue-and-groove and is provided with a fan-shaped water sealing steel plate; the dewatering well pipe is provided with a well sealing steel plate, and the side wall of the dewatering well pipe is provided with a water stopping ring wing; the outer pipe of the well sealing device is sleeved in the well pipe of the dewatering well; the inner pipe of the well sealing device is sleeved in the outer pipe of the well sealing device, the lower end of the inner pipe is provided with an inner pipe drainage hole, and the inner pipe is limited and fixed through an inner pipe limiting steel plate; the inner pipe water stop bar clamping groove is arranged between the outer pipe of the well sealing device and the inner pipe of the well sealing device and is provided with an inner pipe water stop bar; the bottom plate steel plate is arranged at the lower end of the outer tube of the sealing device and is provided with a bottom plate water-stop bar clamping groove and bottom plate water-stop bars at two ends; the water stop plate is arranged between the bottom plate steel plate and the inner pipe limit steel plate. The method has the advantages of realizing continuous well sealing, providing enough time for concrete solidification and ensuring one-time successful well sealing.

Description

Well sealing device and method for pressure-bearing and pressure-reducing well

Technical Field

The invention relates to the technical field of mechanical manufacturing and foundation pit dewatering, in particular to a well sealing device of a pressure-bearing dewatering well.

Background

At present, with the continuous development of urban underground space, deep foundation pit engineering is more and more common, and foundation pit depth is also more and more large. The plugging of deep foundation pit dewatering well, especially pressure-bearing dewatering well, has become the key link of the whole underground structure construction, and it directly influences the waterproof of engineering and whether the subsequent construction can be carried out smoothly. However, in the aspect of well sealing construction, the methods of each design unit and construction unit are not uniform, and standard methods are not set in the industry. The construction unit generally seals the well according to the design drawing of the design institute or seals the well according to experience.

In the prior art, the measures adopted by most construction units are as follows: after the foundation pit bottom plate is poured, a large amount of water is pumped and drained from the dewatering well, then clay balls are filled into the dewatering well by utilizing the gap for returning the underground water level, concrete is filled into the dewatering well, tamping is carried out while filling, and finally a steel plate and a well pipe are placed and welded. This is effective for precipitation wells with small pressure-bearing heads and low groundwater lift. However, the method is not suitable for a dewatering well with a large pressure-bearing water head or a high groundwater lifting speed, and well sealing fails under the impact of groundwater before clay ball precipitation and concrete solidification. Part of construction units are to win construction time, and the water pump is abandoned and sealed in the well. The traditional well sealing method uses clay balls and concrete for filling, when the water head difference of a dewatering well is large and the water pressure is large, the time for filling the clay balls and filling the concrete is very limited, and the clay balls and the concrete are flushed by underground water before the concrete is solidified, so that well sealing failure is caused.

In summary, the conventional well sealing method uses clay balls and concrete for filling, when the water head difference of the dewatering well is large and the water pressure is large, the time for filling the clay balls and the concrete is very limited, and the well sealing is failed because the clay balls and the concrete are flushed by underground water before the concrete is solidified.

Disclosure of Invention

The invention mainly aims to provide a well sealing device and a well sealing method for a pressure-bearing dewatering well, which are used for solving the problems that in the prior art, a traditional well sealing method uses clay balls and concrete for filling, when the dewatering well has large water head difference and large water pressure, the time for filling the clay balls and filling the concrete is very limited, and the well sealing is failed because the clay balls and the concrete are flushed by underground water before the concrete is solidified.

In order to achieve the above object, according to one aspect of the present invention, there is provided a well sealing device for a pressure-bearing well, comprising:

the bottom plate is provided with a bottom plate rabbet and provided with a fan-shaped waterproof steel plate;

the dewatering well pipe is provided with a well sealing steel plate, and the side wall of the dewatering well pipe is provided with a water stopping ring wing;

the outer pipe of the well sealing device is sleeved in the well pipe of the dewatering well;

the inner pipe of the well sealing device is sleeved in the outer pipe of the well sealing device, the lower end of the inner pipe is provided with an inner pipe drainage hole, and the inner pipe is limited and fixed through an inner pipe limiting steel plate;

the inner pipe water stop bar clamping groove is arranged between the outer pipe of the well sealing device and the inner pipe of the well sealing device and is provided with an inner pipe water stop bar; and

the bottom plate steel plate is arranged at the lower end of the outer tube of the sealing device and is provided with a bottom plate water-stop bar clamping groove and bottom plate water-stop bars at two ends;

the water stop plate is arranged between the bottom plate steel plate and the inner pipe limit steel plate.

Preferably, fourth micro-expansion concrete is poured in the tongue-and-groove of the bottom plate; pouring third micro-expansion cement on the upper section of the dewatering well pipe; quick-setting cement is poured between the lower section of the dewatering well pipe and the outer pipe of the well sealing device, and first micro-expansion concrete is poured between the middle section of the dewatering well pipe and the outer pipe of the well sealing device; and pouring second micro-expansion concrete into the outer pipe of the well sealing device and the inner pipe of the well sealing device.

Preferably, the water-stopping annular wings are arranged in pairs, the water-stopping annular wings are connected with the side wall of the dewatering well pipe in a welding mode, and the water-stopping annular wings adopt pattern steel plates.

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

Preferably, a pair of well sealing steel plates is welded in the dewatering well pipe, and third micro-expansion concrete is poured between the pair of well sealing steel plates.

Preferably, when groundwater is continuously pumped and discharged through the inner pipe of the well sealing device, and the outer pipe of the well sealing device and the dewatering well pipe are in a water-free state or a state with little water quantity and no water pressure, quick-drying cement is filled between the bottom end of the outer pipe of the well sealing device and the dewatering well pipe for sealing.

Preferably, a water pump pipe is connected above the inner pipe of the well sealing device, the water pump pipe is connected with a water pump, and the water pump pumps underground water.

Preferably, an inner pipe drain hole is formed at the lower end of the inner pipe of the well sealing device, and the inner pipe drain hole guides groundwater to be drained upwards from the water permeable hole of the bottom plate through the inner pipe drain hole.

Preferably, the side wall of the outer tube of the well sealing device is provided with a peg.

According to another aspect of the invention, there is provided a well-sealing method of a pressure-bearing dewatering well, comprising:

the underground water is guided to be discharged upwards from the water permeable hole of the bottom plate through the water discharge hole of the inner pipe, the upper part of the inner pipe of the well sealing device is connected with a water pump pipe and then connected with a water pump, and the underground water is continuously pumped and discharged through the water pump;

continuously pumping and draining underground water through an inner pipe of the well sealing device, wherein an outer pipe of the well sealing device and a dewatering well pipe are in a water-free state, or the water quantity is very small and the water is free from water pressure, and quick-setting cement is filled between the bottom end of the outer pipe and the dewatering well pipe at the moment to further seal;

after the strength of the concrete between the outer pipe of the well sealing device and the dewatering well pipe is formed, the inner pipe of the well sealing device is rotated to seal underground water by utilizing a drainage hole on a fan-shaped waterproof steel plate sealing bottom plate, and after the water in the inner pipe of the well sealing device is drained, the second micro-expansion concrete is immediately poured into the inner pipe of the well sealing device and is poured into the inner pipe until the inner pipe is flush with the bottom of the bottom plate;

cutting an outer pipe of the well sealing device and an inner pipe of the well sealing device to be flush with the bottom of the bottom plate, and cutting a dewatering well pipe to be flush with the lower end of a tongue-and-groove of the bottom plate;

welding a first well sealing steel plate in the dewatering well pipe, tightly attaching the first well sealing steel plate to the poured well sealing concrete, pouring third micro-expansion concrete on the first well sealing steel plate, and then welding a second well sealing steel plate;

and pouring fourth micro-expansion concrete at the tongue-and-groove position of the bottom plate after the second well sealing steel plate is welded.

The technical scheme of the invention has the following technical effects:

the well sealing method of the pressure-bearing and pressure-reducing well overcomes the defects of imperfect traditional pressure-bearing well sealing technology and low one-time success rate in foundation pit construction, and provides a well sealing scheme aiming at the specific situation of the pressure-bearing and pressure-reducing well in foundation pit engineering, and the method is clear in operation steps, simple, convenient and economical.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 shows a schematic structural view of a well sealing device of a pressure-bearing dewatering well according to the present invention;

FIG. 2 shows a structural view of the well sealing device of the pressure-bearing well of FIG. 1, illustrating the implementation of well casing concrete pouring;

FIG. 3 shows a structural view of the well sealing device of the pressure-bearing well of FIG. 1, in which the inner pipe concrete pouring is carried out;

FIG. 4 shows a structural view of the well sealing device of the pressure-bearing well of FIG. 1, which performs dewatering well sealing;

FIG. 5 shows a cross-sectional view in the a-a direction of the well sealing device of the pressure-bearing well in FIG. 1;

FIG. 6 shows a cross-sectional view in the direction b-b of the well sealing device of the pressure-bearing well of FIG. 1;

FIG. 7 shows a cross-sectional view in the c-c direction of the well sealing device of the pressure-receiving well of FIG. 1;

FIG. 8 shows a cross-sectional view in the d-d direction of the well seal of the pressure-receiving well of FIG. 1;

fig. 9 is a view showing the structure of the inner pipe drainage hole of the well sealing device of the pressure-bearing well in fig. 1.

Wherein the above figures include the following reference numerals:

a dewatering well pipe 1; a bottom plate tongue-and-groove 2; the water stop ring wing 3; a peg 4; an outer casing 5 of the well sealing device; the inner pipe water stop strip clamping groove 6; an inner pipe water stop strip 7; a bottom plate water stop strip 8; a bottom plate water stop bar clamping groove 9; a well-sealing device inner pipe 10; an inner pipe drain hole 11; an inner pipe limit steel plate 12; a base plate connecting bolt 13; a bottom plate adjusting bolt 14; a bottom plate water-permeable hole 15; a floor steel plate 16; a water-stop plate 17; quick-setting cement 18; a first micro-expansive concrete 19; a second micro-expansive concrete 20; a third micro-expansive concrete 21; a well-sealing steel plate 22; fourth micro-expansive concrete 23; fan-shaped water-barrier steel plates 24.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1 to 9, the embodiment of the invention provides a well sealing device of a pressure-bearing and pressure-reducing well, which comprises a bottom plate, a bottom plate tongue-and-groove 2 and a fan-shaped waterproof steel plate 24; the dewatering well pipe 1 is provided with a well sealing steel plate 22, and the side wall of the dewatering well pipe is provided with a water stopping ring wing 3; the outer pipe 5 of the well sealing device is sleeved in the well pipe of the dewatering well; an inner pipe 10 of the well sealing device is sleeved in an outer pipe 5 of the well sealing device, the lower end of the inner pipe is provided with an inner pipe drainage hole 11, and the inner pipe is limited and fixed through an inner pipe limiting steel plate 12; the inner pipe water stop 7 clamping groove 6 is arranged between the outer pipe 5 of the well sealing device and the inner pipe 10 of the well sealing device and is provided with an inner pipe water stop 7; the bottom plate steel plate 16 is arranged at the lower end of the outer tube of the sealing device and is provided with a bottom plate water-stop bar clamping groove 9 and bottom plate water-stop bars 8 at two ends; the water stop plate 17 is arranged between the bottom plate steel plate 16 and the inner pipe limit steel plate 12. The invention can realize continuous well sealing, provide enough time for concrete solidification and ensure that well sealing is successful once.

In the embodiment, the bottom plate plays a role of upper support and is provided with a bottom plate rabbet 2, a fan-shaped water-proof steel plate 24 is arranged, the water-proof steel plate is used for water-proof, fourth micro-expansion concrete 23 is poured in the bottom plate rabbet 2, third micro-expansion cement is poured at the upper section of the dewatering well pipe 1, quick-setting cement 18 is poured between the lower section of the dewatering well pipe 1 and the outer pipe 5 of the well sealing device, and first micro-expansion concrete 19 is poured between the middle section of the dewatering well pipe 1 and the outer pipe 5 of the well sealing device; a second micro-expansive concrete 20 is poured into the outer casing 5 and the inner casing 10. And sealing the well by pouring multi-layer concrete.

In this embodiment, the dewatering well pipe 1 is used for forming the peripheral sleeve pipe of well sealing, is equipped with the steel sheet 22 of sealing, and the steel sheet 22 of sealing realizes sealing the well, and the lateral wall is equipped with the stagnant water ring wing 3, and stagnant water ring wing 3 is used for the stagnant water, and stagnant water ring wing 3 sets up in pairs, and stagnant water ring wing 3 links to each other through the welding mode with dewatering well pipe 1 lateral wall, and stagnant water ring wing 3 adopts the decorative pattern steel sheet. The pair of well sealing steel plates 22 are welded in the dewatering well pipe 1, third micro-expansion concrete 21 is poured between the pair of well sealing steel plates 22, water stop strip clamping grooves are welded on the bottom plate in the circumferential direction, rubber water stop ring wings 3 are arranged in the water stop strip clamping grooves, and the water stop rings can expand rapidly after meeting water, so that the effect of isolating underground water is achieved. The water stop ring wing 3 is supported and fixed through the water stop groove.

In the embodiment, an outer pipe 5 of the well sealing device is sleeved in a well pipe of a dewatering well; the outer pipe 5 of the well sealing device is flush with the inner pipe 10 of the well sealing device when the bottom of the bottom plate is cut, the dewatering well pipe 1 is cut flush with the lower end of the tongue-and-groove 2 of the bottom plate, and the side wall of the outer pipe 5 of the well sealing device is provided with a bolt 4. After the strength of the concrete between the outer pipe 5 of the well sealing device and the dewatering well pipe 1 is formed, the inner pipe 10 of the rotary well sealing device is used for sealing the bottom plate water permeable holes 15 on the bottom plate by using the fan-shaped water-proof steel plates 24, and at the moment, the underground water can be smoothly sealed. Immediately after draining the inner pipe 10 of the well sealing device, concrete is then poured into the bottom plate. After the strength of the concrete between the outer pipe 5 of the well sealing device and the dewatering well pipe 1 is formed, the inner pipe 10 of the rotary well sealing device is used for sealing the underground water by using the drainage holes on the fan-shaped waterproof steel plates 24 to seal the bottom plate, and after the water in the inner pipe 10 of the well sealing device is drained, the second micro-expansion concrete 20 is immediately poured into the well sealing device and is poured to be flush with the bottom of the bottom plate.

In the embodiment, an inner pipe 10 of the well sealing device is sleeved in an outer pipe 5 of the well sealing device, an inner pipe drainage hole 11 is formed in the lower end of the inner pipe, and the inner pipe is limited and fixed through an inner pipe limiting steel plate 12; the lower end of the inner pipe 10 of the well sealing device is provided with an inner pipe drain hole 11, and the inner pipe drain hole 11 guides groundwater to be discharged upwards from the bottom plate water permeable hole 15 through the inner pipe drain hole 11. The outer pipe 5 of the well sealing device and the inner pipe 10 of the well sealing device are cut to the bottom of the bottom plate, the dewatering well is cut to the lower end of the tongue-and-groove, a first well sealing steel plate 22 is welded in the dewatering well pipe 1, and the first well sealing steel plate 22 is tightly attached to the poured well sealing concrete. And pouring third concrete on the first well sealing steel plate 22, then welding a second well sealing steel plate 22, and pouring fourth micro-expansion concrete 23 at the position of the tongue-and-groove 2 of the bottom plate after the second well sealing steel plate 22 is welded, wherein the poured concrete adopts micro-expansion concrete with a level higher than the strength of the design bottom plate. The underground water is guided to be upwards discharged from the bottom plate water permeable hole 15 through the inner pipe water discharge hole 11 by the inner pipe water discharge hole 11 at the lower end of the inner pipe, the upper part of the inner pipe 10 of the well sealing device is connected with a water pump pipe and then connected with a water pump, and the underground water is continuously pumped and discharged by the water pump.

In this embodiment, the inner pipe water stop 7 is provided between the outer pipe 5 of the well sealing device and the inner pipe 10 of the well sealing device, and the inner pipe water stop 7 is provided. The bottom plate steel plate 16 is connected with the water stop plate 17 through the bottom plate adjusting bolt 14 and is connected with the outer pipe 5 of the well sealing device through the bottom plate connecting bolt 13, is arranged at the lower end of the outer pipe of the sealing device, is provided with a bottom plate water permeable hole 15, and is provided with a bottom plate water stop bar clamping groove 9 and a bottom plate water stop bar 8 at two ends; holes are formed in the bottom plate, the fan-shaped water-stop plate 17 avoids the holes of the bottom plate at the moment, drainage holes are formed in the lower end of the inner pipe 10 of the well sealing device, groundwater is guided to be upwards discharged from the holes of the bottom plate through the holes of the inner pipe 10 of the well sealing device, and a water pump pipe is connected above the inner pipe 10 of the well sealing device to continuously pump and drain the groundwater. Because groundwater is continuously pumped out through the inner pipe 10 of the well sealing device, the outer pipe 5 of the well sealing device and the dewatering well pipe 1 are in a water-free state, or the water quantity is very small and the water is free from water pressure. At this time, quick-setting cement 18 is filled between the bottom end of the outer pipe 5 of the well sealing device and the dewatering well pipe 1, the well sealing device is further sealed, first micro-expansion concrete 19 which is one level higher than the bottom plate is poured above the quick-setting cement 18, and the first expansion concrete is poured to the bottom of the bottom plate. The water stop plate 17 is used for water stop and is arranged between the bottom plate steel plate 16 and the inner pipe limit steel plate 12.

In this embodiment, when groundwater is continuously pumped out through the inner pipe 10 of the well sealing device, the outer pipe 5 of the well sealing device is in a water-free state or a state with little water and no water pressure is present between the outer pipe 5 of the well sealing device and the dewatering well pipe 1, the well sealing device is closed by filling quick-setting cement 18 between the bottom end of the outer pipe 5 of the well sealing device and the dewatering well pipe 1. Through the invention, continuous well sealing can be realized, enough time is provided for concrete solidification, and one-time success of well sealing can be ensured. In the construction stage of the underground structure, the dewatering well continuously pumps water, two water-stopping annular wings 3 are welded on the dewatering well pipe 1 within the range of the bottom plate, the water-stopping magic wings are made of patterned steel plates, the steel plates are fully welded with the dewatering well pipe 1, and the water-stopping annular wings 3 are poured into the concrete of the bottom plate. The bottom plate of the dewatering well is arranged in a tongue-and-groove mode, and a galvanized water-stopping steel plate is arranged on the bottom plate. The dewatering well water-proof device is installed on the ground, and mainly comprises a bottom plate, a well sealing device outer pipe 5 and a well sealing device inner pipe 10. And (5) draining water by utilizing the precipitation well Shui Bengchou, quickly taking out the water pump, and immediately loading the assembled water isolation device into the precipitation well. In the water isolation device, a water stop bar clamping groove is formed in the circumferential welding of the bottom plate, a rubber water stop ring wing 3 is arranged in the water stop bar clamping groove, and the water stop ring wing 3 can expand rapidly after meeting water, so that the effect of isolating underground water is achieved.

Another aspect of the invention provides a well sealing method for a pressure-bearing dewatering well, comprising the following steps:

the underground water is guided to be discharged upwards from the bottom plate water permeable hole 15 through the inner pipe water discharge hole 11 at the lower end of the inner pipe, a water pump pipe is connected above the inner pipe 10 of the well sealing device, and then the water pump is connected, and the underground water is continuously pumped and discharged through the water pump;

continuously pumping and draining underground water through the inner pipe 10 of the well sealing device, wherein the outer pipe 5 of the well sealing device is in a water-free state with the precipitation well pipe 1, or the water quantity is very small and the water is free from water pressure, and quick-setting cement 18 is filled between the bottom end of the outer pipe and the precipitation well pipe at the moment to further seal;

after the strength of the concrete between the outer pipe 5 of the well sealing device and the dewatering well pipe 1 is formed, the inner pipe 10 of the well sealing device is rotated to seal underground water by utilizing the drainage holes on the fan-shaped waterproof steel plate 24 to seal the bottom plate, and after the water in the inner pipe 10 of the well sealing device is drained, the second micro-expansion concrete 20 is immediately poured into the well sealing device and is poured into the well sealing device until the water is flush with the bottom of the bottom plate;

cutting the outer pipe 5 of the well sealing device and the inner pipe 10 of the well sealing device to be flush with the bottom of the bottom plate, and cutting the dewatering well pipe 1 to be flush with the lower end of the tongue-and-groove 2 of the bottom plate;

welding a first well sealing steel plate 22 in the dewatering well pipe 1, tightly attaching the first well sealing steel plate 22 to the poured well sealing concrete, pouring a third micro-expansion concrete 21 on the first well sealing steel plate 22, and then welding a second well sealing steel plate 22;

and after the second well sealing steel plate 22 is welded, pouring fourth micro-expansion concrete 23 at the groove and tongue 2 position of the bottom plate.

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

the well sealing method of the pressure-bearing and pressure-reducing well overcomes the defects of imperfect traditional pressure-bearing well sealing technology and low one-time success rate in foundation pit construction, provides a well sealing scheme aiming at the specific situation of the pressure-bearing and pressure-reducing well in foundation pit engineering, has definite operation steps, is simple, convenient and economic, and has good popularization and application values.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A well sealing device for a pressure-bearing dewatering well, comprising:

the bottom plate is provided with a bottom plate rabbet and provided with a fan-shaped waterproof steel plate;

the dewatering well pipe is provided with a well sealing steel plate, and the side wall of the dewatering well pipe is provided with a water stopping ring wing;

the outer pipe of the well sealing device is sleeved in the well pipe of the dewatering well;

the inner pipe of the well sealing device is sleeved in the outer pipe of the well sealing device, the lower end of the inner pipe is provided with an inner pipe drainage hole, and the inner pipe is limited and fixed through an inner pipe limiting steel plate;

the inner pipe water stop bar clamping groove is arranged between the outer pipe of the well sealing device and the inner pipe of the well sealing device and is provided with an inner pipe water stop bar; and

the bottom plate steel plate is arranged at the lower end of the outer tube of the sealing device and is provided with a bottom plate water-stop bar clamping groove and bottom plate water-stop bars at two ends;

the water stop plate is arranged between the bottom plate steel plate and the inner pipe limit steel plate.

2. The well sealing device of the pressure-bearing well according to claim 1, wherein fourth micro-expansive concrete is poured into the tongue-and-groove of the bottom plate; pouring third micro-expansion cement on the upper section of the dewatering well pipe; quick-setting cement is poured between the lower section of the dewatering well pipe and the outer pipe of the well sealing device, and first micro-expansion concrete is poured between the middle section of the dewatering well pipe and the outer pipe of the well sealing device; and pouring second micro-expansion concrete into the outer pipe of the well sealing device and the inner pipe of the well sealing device.

3. The well sealing device of the pressure-bearing well as claimed in claim 1, wherein the water stopping ring wings are arranged in pairs, the water stopping ring wings are connected with the side wall of the well pipe of the dewatering well in a welding mode, and the water stopping ring wings adopt pattern steel plates.

4. A well closing device for a pressure-bearing well as claimed in claim 1, wherein the outer pipe of the well closing device is flush with the inner pipe of the well closing device cut to the bottom of the bottom plate, and the well pipe of the well closing device is flush with the lower end of the tongue-and-groove of the bottom plate.

5. The well sealing device of the pressure-bearing well according to claim 1, wherein a pair of well sealing steel plates are welded in the dewatering well pipe, and third micro-expansion concrete is poured between the pair of well sealing steel plates.

6. The well sealing device of the pressure-bearing well according to claim 1, wherein when groundwater is continuously pumped out through the inner pipe of the well sealing device, the outer pipe of the well sealing device is in a water-free state or a state with little water and no water pressure is provided between the outer pipe of the well sealing device and the dewatering well pipe, the well sealing device is sealed by filling quick-setting cement between the bottom end of the outer pipe of the well sealing device and the dewatering well pipe.

7. The well sealing device of the pressure-bearing well as claimed in claim 1, wherein a water pump pipe is connected above the inner pipe of the well sealing device, the water pump pipe is connected with a water pump, and the water pump pumps underground water.

8. The well sealing device for the pressure-bearing well according to claim 1, wherein an inner pipe drainage hole is formed at the lower end of the inner pipe of the well sealing device, and the inner pipe drainage hole guides groundwater to be drained upwards from the bottom plate water permeable hole through the inner pipe drainage hole.

9. A well closing device for a pressure-bearing well according to claim 1, wherein the side wall of the outer tube of the well closing device is provided with pegs.

10. A well sealing method of a pressure-bearing well, based on the well sealing device of the pressure-bearing well according to any one of claims 1 to 9, characterized by comprising:

the underground water is guided to be discharged upwards from the water permeable hole of the bottom plate through the water discharge hole of the inner pipe, the upper part of the inner pipe of the well sealing device is connected with a water pump pipe and then connected with a water pump, and the underground water is continuously pumped and discharged through the water pump;

continuously pumping and draining underground water through an inner pipe of the well sealing device, wherein an outer pipe of the well sealing device and a dewatering well pipe are in a water-free state, or the water quantity is very small and the water is free from water pressure, and quick-setting cement is filled between the bottom end of the outer pipe and the dewatering well pipe at the moment to further seal;

after the strength of the concrete between the outer pipe of the well sealing device and the dewatering well pipe is formed, the inner pipe of the well sealing device is rotated to seal underground water by utilizing a drainage hole on a fan-shaped waterproof steel plate sealing bottom plate, and after the water in the inner pipe of the well sealing device is drained, the second micro-expansion concrete is immediately poured into the inner pipe of the well sealing device and is poured into the inner pipe until the inner pipe is flush with the bottom of the bottom plate;

cutting an outer pipe of the well sealing device and an inner pipe of the well sealing device to be flush with the bottom of the bottom plate, and cutting a dewatering well pipe to be flush with the lower end of a tongue-and-groove of the bottom plate;

welding a first well sealing steel plate in the dewatering well pipe, tightly attaching the first well sealing steel plate to the poured well sealing concrete, pouring third micro-expansion concrete on the first well sealing steel plate, and then welding a second well sealing steel plate;

and pouring fourth micro-expansion concrete at the tongue-and-groove position of the bottom plate after the second well sealing steel plate is welded.

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