Plugging structure for dewatering well in water-rich stratum

Abstract

The utility model discloses a water-rich stratum dewatering well plugging structure, and belongs to the technical field of dewatering well plugging. A water-rich stratum dewatering well plugging structure comprises a dewatering well pipe vertically arranged on the ground and a cushion layer laid on the ground, and a waterproof coiled material is arranged between the cushion layer and the ground in advance; the external expansion cavity is formed in the periphery of the top of the dewatering well casing, and a plug steel pipe with the diameter larger than that of the dewatering well casing is placed at the bottom in the external expansion cavity; the waterproof coiled material is additionally arranged at the joint of the plug steel pipe and the cushion layer to form an integral waterproof layer, the top plugging steel plate is connected with the plug steel pipe in a welded mode, the plugging assembly is arranged at the joint of the dewatering well pipe and the plug steel pipe, and weak points which may leak in well plugging construction are reinforced through the three measures, so that the construction efficiency is improved. The anti-seepage reliability of the water-rich stratum dewatering well after dewatering is stopped is improved, and the operation and maintenance cost in the subsequent building use stage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of dewatering well plugging technology, and in particular to a dewatering well plugging structure in water-rich strata. Background Technology

[0002] With the rapid development of my country's economic construction, underground engineering is in a stage of rapid development and is becoming more widespread. During the construction of underground engineering projects, it is necessary to dewater the groundwater to ensure the smooth and safe construction of the main structure; after the main structure is completed, the dewatering wells need to be sealed.

[0003] Currently, dewatering wells in basements of building construction projects are typically backfilled with concrete and gravel to the wellhead. Waterproof sleeves and plugs are pre-embedded during the pouring of the base slab. After dewatering is completed, steel plates are bolted to the plug flanges, and a waterproof sealing rubber ring is placed in the middle. However, this method has a poor sealing effect when sealing dewatering wells in water-rich strata, and there is a risk of leakage.

[0004] Therefore, this application proposes a dewatering well sealing structure, mainly to improve the reliability of dewatering well sealing in water-rich strata and reduce the quality risk of basement floor leakage after dewatering stops. Utility Model Content

[0005] The purpose of this utility model is to solve the problems in the prior art by proposing a sealing structure for dewatering wells in water-rich strata.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A sealing structure for dewatering wells in water-rich formations, including

[0008] The well pipes of the vertically installed dewatering wells on the ground and the subfloor layer laid on the ground, wherein a waterproof membrane is pre-installed between the subfloor layer and the ground;

[0009] An external expansion cavity is formed around the top of the dewatering well pipe, and a plug steel pipe with a diameter larger than that of the dewatering well pipe is placed at the bottom of the external expansion cavity;

[0010] A sealing structure for sealing the well pipe and plug steel pipe of a dewatering well.

[0011] In some embodiments, two first water-stop rings are fixed to the surface of the plug steel pipe, and a sealing steel plate is welded to the top of the plug steel pipe.

[0012] In some embodiments, the outer diameter of the expansion cavity is greater than 50cm, the outer depth is greater than 50cm, and the expansion cavity is backfilled with concrete.

[0013] In some embodiments, the end of the waterproof membrane near the end cap of the steel pipe is turned up to below the first water-stop ring located at a high position.

[0014] In some embodiments, the sealing structure includes

[0015] The sand and gravel backfill layer filling the well casing of the dewatering well;

[0016] Concrete filling the space above the sand and gravel backfill layer and between the dewatering well pipe and the plug steel pipe;

[0017] The sealing assembly installed inside the plug steel pipe is used to seal the connection between the dewatering well pipe and the plug steel pipe;

[0018] Concrete is filled over the sealing assembly.

[0019] In some embodiments, the sealing assembly includes a mounting bracket and a rotating shaft rotatably connected to the surface of the mounting bracket. The rotating shaft surface is provided with a first thread, a second thread, and a third thread from top to bottom, and the helical direction of the third thread is opposite to that of the first thread and the second thread.

[0020] In some embodiments, the plugging assembly further includes

[0021] A first pressure ring threaded onto the surface of the first thread and a first airbag fixed between the first pressure ring and the upper surface of the mounting bracket;

[0022] A second pressure ring threadedly connected to the second threaded surface and a second airbag disposed inside a cavity, the cavity being opened inside a mounting bracket;

[0023] The third pressure ring is threaded onto the surface of the third thread, and the third airbag is fixed between the third pressure ring and the lower surface of the mounting bracket. The first airbag, the second airbag, and the third airbag respectively seal multiple connection points at the connection position between the well pipe of the dewatering well and the plug steel pipe.

[0024] In some embodiments, the lower surface of the mounting bracket is provided with a groove for mounting the mounting bracket on the top of the dewatering well pipe, and two positioning blocks are fixed inside the groove. The top of the dewatering well pipe is provided with two positioning slots that cooperate with the positioning blocks.

[0025] In some embodiments, the surface of the cushion layer is provided with a recess for avoiding the well pipe of the dewatering well, the recess being filled with concrete, and the filling height being flush with the upper surface of the cushion layer.

[0026] Compared with the prior art, this utility model provides a sealing structure for dewatering wells in water-rich formations, which has the following beneficial effects.

[0027] 1. This utility model strengthens the weak points that may leak during well sealing construction by adding waterproof membrane at the junction of the plug steel pipe and the bedding layer, welding the top sealing steel plate to the plug steel pipe, and setting a sealing component at the junction of the dewatering well pipe and the plug steel pipe. This improves the seepage prevention reliability of the dewatering well in water-rich strata after dewatering stops and reduces the operation and maintenance costs during the subsequent building use phase.

[0028] 2. This utility model uses multiple airbags to seal multiple connection points at the connection between the dewatering well pipe and the plug steel pipe. The impermeable properties of the rubber airbags reduce the risk of water seepage and prevent the gaps caused by incomplete filling of the gaps between the dewatering well pipe and the plug steel pipe by concrete, which could lead to gaps and water seepage.

[0029] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.

[0031] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0032] Figure 3 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0033] Figure 4 This is a cross-sectional structural diagram of the sealing component in this utility model.

[0034] Figure 5 This is an exploded structural diagram of the sealing component in this utility model.

[0035] Figure 6 This is a schematic diagram of the structure of the well pipe for the precipitation well in this utility model.

[0036] In the picture:

[0037] 1. Well casing for dewatering wells; 2. Subbase; 3. Plug steel pipe; 301. First water-stop ring; 302. Sealing steel plate; 4. External expansion cavity; 5. Waterproof membrane; 6. Sand and gravel backfill layer; 7. Concrete; 8. Second water-stop ring; 9. Sealing assembly; 901. Mounting bracket; 902. Rotating shaft; 903. First pressure ring; 9031. First airbag; 9032. First limiting rod; 9033. First thread; 904. Second pressure ring; 9041. Cavity; 9042. Second thread; 9043. Second airbag; 9044. Opening; 905. Third pressure ring; 9051. Third thread; 9052. Third airbag; 9053. Second limiting rod; 10. Rubber ring; 11. Positioning groove; 12. Positioning block. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0039] Reference Figure 1-6 A sealing structure for a dewatering well in a water-rich stratum includes a dewatering well pipe 1 vertically installed on the ground and a cushion layer 2 laid on the ground surface. The height of the cushion layer 2 is higher than the upper end of the dewatering well pipe 1. The surface of the cushion layer 2 is provided with recesses to avoid the dewatering well pipe 1. A waterproof membrane 5 is pre-installed between the cushion layer 2 and the ground. An outward expansion cavity 4 is opened around the top of the dewatering well pipe 1, with an outward expansion diameter greater than 50cm and an outward expansion depth greater than 50cm. A plug steel pipe 3 with a diameter greater than the diameter of the dewatering well pipe 1 is placed at the bottom of the outward expansion cavity 4. The plug steel pipe 3 is connected to the dewatering well pipe 1. The well pipe 1 is concentrically arranged, so that a large gap is created between the well pipe 1 and the plug steel pipe 3 to facilitate filling with concrete 7. The height of the top of the plug steel pipe 3 is lower than the height of the upper surface of the pad layer 2. Two first water-stop rings 301 are fixed on the surface of the plug steel pipe 3. The heights of the two first water-stop rings 301 are located at the middle of the depression and the middle of the outer expansion cavity 4, respectively. Concrete 7 is backfilled in the outer expansion cavity 4, and the pre-set waterproof membrane 5 is laid completely on the surface of the concrete 7 in the outer expansion cavity 4 and turned up to the bottom of the first water-stop ring 301 located at the high position.

[0040] A sand and gravel backfill layer 6 is filled inside the dewatering well pipe 1, with a filling depth of 3m below the ground surface. The sand and gravel backfill layer 6 uses a 1:1 sand and gravel backfill. Concrete 7 is filled on top of the sand and gravel backfill layer 6, with the filling height lower than the top of the dewatering well pipe 1. At the same time, concrete 7 is filled into the gap between the dewatering well pipe 1 and the plug steel pipe 3, with the filling height also lower than the top of the dewatering well pipe 1. The gap between the dewatering well pipe 1 and the plug steel pipe 3 is filled. A sealing component 9 is placed inside the plug steel pipe 3 to further seal the connection between the dewatering well pipe 1 and the plug steel pipe 3.

[0041] Continue filling the end cap steel pipe 3 with concrete 7 until the top of the end cap steel pipe 3. Finally, weld the sealing steel plate 302 to the top of the end cap steel pipe 3, and fill the depression with concrete 7 until it is flush with the upper surface of the cushion layer 2. Reinforcing bars are set in both the cushion layer 2 and the concrete 7 in the depression. The reinforcing bars are welded to the end cap steel pipe 3 to make the end cap steel pipe 3 more stable. A second water-stop ring 8 is preset at the junction of the depression and the cushion layer 2. All concrete 7 is C35 micro-expansion low-shrinkage quick-setting concrete 7.

[0042] Understandably, by adding waterproof membrane 5 at the junction of the plug steel pipe 3 and the pad layer 2 to form an integral waterproof layer, by welding the top sealing steel plate 302 to the plug steel pipe 3, and by setting a sealing component 9 at the junction of the dewatering well pipe 1 and the plug steel pipe 3, the above three measures strengthen the weak points that may leak during the well sealing construction, improve the seepage prevention reliability of the dewatering well in the water-rich strata after the dewatering stops, reduce the operation and maintenance costs in the subsequent building use stage, and the two first water-stop rings 301 and the second water-stop ring 8 further reduce the risk of leakage.

[0043] Specifically, the sealing component 9 includes a mounting bracket 901. The lower surface of the mounting bracket 901 has a groove for mounting the mounting bracket 901 on the top of the dewatering well pipe 1. Two positioning blocks 12 are fixed inside the groove. Two positioning slots 11 that cooperate with the positioning blocks 12 are opened on the top of the dewatering well pipe 1.

[0044] It is understandable that by setting the groove, the position of the mounting bracket 901 is positioned so that it is placed in the center of the end cap steel pipe 3. By setting the positioning groove 11 and the positioning block 12, when the mounting bracket 901 is placed, the positioning block 12 is engaged in the positioning groove 11, thereby limiting the position of the mounting bracket 901 and preventing the mounting bracket 901 from rotating at will.

[0045] Specifically, the sealing assembly 9 also includes a rotating shaft 902 rotatably connected to the surface of the mounting bracket 901. The surface of the rotating shaft 902 is provided with a first thread 9033, a second thread 9042 and a third thread 9051 from top to bottom. The helical direction of the third thread 9051 is opposite to the helical direction of the first thread 9033 and the second thread 9042. An internal hexagonal head is fixed at the upper end of the rotating shaft 902.

[0046] A first pressure ring 903 is threadedly connected to the surface of the first thread 9033. The first pressure ring 903 is positioned above the mounting bracket 901. The first pressure ring 903 includes a sliding shaft and an upper pressure plate fixed to the upper end of the first sliding shaft. The diameter of the upper pressure plate is larger than the diameter of the first sliding shaft. A first limiting rod 9032 is fixed to the surface of the first sliding shaft. The first sliding shaft and the first limiting rod 9032 slide vertically on the top of the mounting bracket 901, and the first sliding shaft is threadedly connected to the surface of the first thread 9033. A first airbag 9031 is fixed between the upper pressure plate and the upper surface of the mounting bracket 901. The diameter of the upper pressure plate is the same as the diameter of the side of the mounting bracket 901 and smaller than the inner diameter of the plug steel pipe 3, so that the first airbag 9031 can enter the gap between the upper pressure plate and the plug steel pipe 3 for sealing.

[0047] The second thread 9042 is threadedly connected to the surface of the second thread 9042. The mounting bracket 901 has an annular cavity 9041 inside, which surrounds the second thread 9042. The second pressure ring 904 includes an outer pressure plate and an inner moving block. The outer pressure plate and the inner moving block are concentrically arranged and fixedly connected by multiple connecting rods. The inner moving block is threadedly connected to the surface of the second thread 9042. The outer pressure ring slides vertically inside the cavity 9041. The inner wall of the cavity 9041 has multiple through slots for moving the connecting rods on the side close to the second thread 9042. The cavity 9041 has a second airbag 9043 inside, which is located below the second pressure ring 904. The bottom of the cavity 9041 has an annular opening 9044, which is placed in the gap between the well pipe 1 of the dewatering well and the plug steel pipe 3.

[0048] A third pressure ring 905 is threadedly connected to the surface of the third thread 9051. The third pressure ring 905 is located below the mounting frame 901. The third pressure ring 905 includes a second sliding shaft threadedly connected to the surface of the third thread 9051 and a lower pressure plate fixed to the lower end of the second sliding shaft. A second limiting rod 9053 is fixed to the surface of the second sliding shaft. The second sliding shaft and the second limiting rod 9053 slide at the bottom of the mounting frame 901. A third airbag 9052 is fixed between the lower pressure plate and the lower surface of the mounting frame 901. The diameter of the lower pressure plate is the same as the diameter of the lower end of the mounting frame 901 and is smaller than the inner diameter of the dewatering well pipe 1. The lower pressure plate and the lower end of the mounting frame 901 are both placed inside the dewatering well pipe 1.

[0049] Understandably, by rotating the shaft 902, the first thread 9033 causes the first pressure ring 903 to slide downwards on the top of the mounting bracket 901, thereby compressing the first airbag 9031 and deforming it to fill the gap between the sealing assembly 9 and the plug steel pipe 3. Simultaneously, the second thread 9042 causes the second pressure ring 904 to slide downwards within the cavity 9041, compressing and deforming the second airbag 9043, causing it to be squeezed out from the opening 9044 to fill the gap between the dewatering well pipe 1 and the plug steel pipe 3. The filling process involves the third thread 9051 driving the third pressure ring 905 to slide upwards at the bottom of the mounting frame 901, thereby compressing and deforming the third airbag 9052 to fill the gap between the mounting frame 901 and the dewatering well pipe 1. Multiple airbags are used to seal multiple connection points at the connection between the dewatering well pipe 1 and the plug steel pipe 3. The impermeable properties of the rubber airbags are used to reduce the risk of water seepage and prevent the concrete 7 from incompletely filling the gap at the connection between the dewatering well pipe 1 and the plug steel pipe 3, which could lead to gaps and water seepage.

[0050] Multiple rubber rings 10 are fixed to the lower surface of the upper pressure plate, the upper surface of the mounting bracket 901, the upper surface of the lower pressure plate, and the lower surface of the mounting bracket 901.

[0051] It is understandable that by setting the rubber rings 10, the first airbag 9031 and the third airbag 9052 will produce curved surfaces when squeezed. With the cooperation of multiple rubber rings 10, groundwater can be further prevented from seeping into the mounting frame 901.

[0052] This utility model also provides a construction method for a sealing structure for dewatering wells in water-rich formations. Based on the above-mentioned sealing structure for dewatering wells in water-rich formations, the method includes the following steps:

[0053] S1. An outer expansion cavity 4 is opened around the top of the well pipe 1 of the dewatering well. The outer expansion cavity 4 has an outer expansion diameter greater than 50cm and an outer expansion depth greater than 50cm. The plug steel pipe 3 is placed at the bottom of the outer expansion cavity 4, and concrete 7 is backfilled in the outer expansion cavity 4.

[0054] S2. Lay the pre-set waterproof membrane 5 completely on the surface of the concrete 7 inside the outer expansion cavity 4, and turn it up to the bottom of the first water-stop ring 301 located at the high position.

[0055] S3. Fill the well pipe 1 with sand and gravel backfill layer 6, and fill the top of the sand and gravel backfill layer 6 with concrete 7. The filling depth of the sand and gravel backfill layer 6 is 3m below the ground. The sand and gravel backfill layer 6 uses 1:1 sand and gravel backfill. At the same time, fill the gap between the well pipe 1 and the plug steel pipe 3 with concrete 7.

[0056] S4. Place the sealing component 9 inside the plug steel pipe 3. When placing it, make the groove correspond to the dewatering well pipe 1 and make the positioning block 12 snap into the positioning groove 11. Then operate the sealing component 9 to seal multiple connection points at the connection position between the dewatering well pipe 1 and the plug steel pipe 3. The sealing method is to make the first thread 9033 drive the first pressure ring 903 to squeeze the first airbag 9031, causing the first airbag 9031 to deform and fill the gap between the sealing component 9 and the plug steel pipe 3. The second thread 9042 drives the second pressure ring 904 to squeeze and deform the second airbag 9043, causing the second airbag 9043 to be squeezed out from the opening 9044 to fill the gap between the dewatering well pipe 1 and the plug steel pipe 3. The third thread 9051 drives the third pressure ring 905 to squeeze and deform the third airbag 9052, causing it to fill the gap between the mounting frame 901 and the dewatering well pipe 1.

[0057] S5. Fill the end cap steel pipe 3 with concrete 7 up to the top of the end cap steel pipe 3. Finally, weld the sealing steel plate 302 to the top of the end cap steel pipe 3 and fill the depression with concrete 7 until it is flush with the pad layer 2.

[0058] In this invention, an outer expansion cavity 4 is formed around the top of the dewatering well pipe 1, and a plug steel pipe 3 is placed at the bottom of the outer expansion cavity 4. Concrete 7 is backfilled inside the outer expansion cavity 4, and a pre-set waterproof membrane 5 is laid completely on the surface of the concrete 7 inside the outer expansion cavity 4, extending upwards to below the first water-stop ring 301 located at a high position. A sand and gravel backfill layer 6 is filled inside the dewatering well pipe 1, with a filling depth of 3m below ground level. Concrete 7 is then filled above the sand and gravel backfill layer 6, with a filling height lower than the top of the dewatering well pipe 1. Simultaneously, the concrete 7 is filled to the junction of the dewatering well pipe 1 and the plug steel pipe. Within the gap between the 3, the filling height is also lower than the top of the well pipe 1 of the dewatering well. The sealing component 9 is placed inside the plug steel pipe 3, with the groove aligned with the well pipe 1 of the dewatering well, and the positioning block 12 engaged in the positioning groove 11. Then, using a tool, the rotating shaft 902 is rotated through the hexagonal head, causing the first thread 9033 to drive the first pressure ring 903 to compress the first airbag 9031, deforming the first airbag 9031 and filling the gap between the sealing component 9 and the plug steel pipe 3. The second thread 9042 drives the second pressure ring 904 to compress the second airbag 9043. The deformation causes the second airbag 9043 to be squeezed out from the opening 9044 to fill the gap between the well pipe 1 and the plug steel pipe 3 of the dewatering well. The third thread 9051 drives the third pressure ring 905 to compress and deform the third airbag 9052, causing it to fill the gap between the mounting frame 901 and the well pipe 1 of the dewatering well. Multiple airbags then seal multiple connection points between the well pipe 1 and the plug steel pipe 3. Next, concrete 7 is filled into the plug steel pipe 3 up to the top of the plug steel pipe 3. Finally, a sealing steel plate 302 is welded to the top of the plug steel pipe 3. The depression is filled with concrete 7 until it is flush with the cushion layer 2, and steel bars are installed in both the cushion layer 2 and the concrete 7 in the depression to complete the construction. A waterproof membrane 5 is added at the junction of the plug steel pipe 3 and the cushion layer 2 to form an integral waterproof layer. The top sealing steel plate 302 is welded to the plug steel pipe 3, and a sealing component 9 is installed at the junction of the dewatering well pipe 1 and the plug steel pipe 3. The above three measures strengthen the weak points that may leak during the well sealing construction, improve the seepage prevention reliability of the dewatering well in the water-rich strata after the dewatering stops, and reduce the operation and maintenance costs in the subsequent building use stage.

[0059] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealing structure for dewatering wells in water-rich formations, characterized in that, include The well pipe (1) of the dewatering well is set vertically on the ground and the bedding layer (2) is laid on the ground. A waterproof membrane (5) is pre-installed between the bedding layer (2) and the ground. An expansion cavity (4) is opened around the top of the well pipe (1) of the dewatering well, and a plug steel pipe (3) with a diameter larger than that of the well pipe (1) is placed at the bottom of the expansion cavity (4). A sealing structure for sealing the well pipe (1) and the plug steel pipe (3) of the dewatering well.

2. The sealing structure for dewatering wells in water-rich formations according to claim 1, characterized in that, The plug steel pipe (3) has two first water-stop rings (301) fixed on its surface, and a sealing steel plate (302) is welded to the top of the plug steel pipe (3).

3. The sealing structure for dewatering wells in water-rich formations according to claim 1, characterized in that, The outer diameter of the outer expansion cavity (4) is greater than 50cm and the outer depth is greater than 50cm. The outer expansion cavity (4) is backfilled with concrete (7).

4. The sealing structure for dewatering wells in water-rich formations according to claim 1, characterized in that, The waterproof membrane (5) is turned up at the end near the end of the plug steel pipe (3) and placed below the first water-stop ring (301) located at a high position.

5. The sealing structure for dewatering wells in water-rich formations according to claim 1, characterized in that, The sealing structure includes The sand and gravel backfill layer (6) is filled in the well pipe (1) of the dewatering well; Concrete (7) filling the gap between the sand and gravel backfill layer (6) and the well pipe (1) of the dewatering well and the plug steel pipe (3); The sealing assembly (9) installed inside the plug steel pipe (3) is used to seal the connection between the well pipe (1) of the dewatering well and the plug steel pipe (3); Concrete (7) is filled on top of the sealing assembly (9).

6. The sealing structure for dewatering wells in water-rich formations according to claim 5, characterized in that, The sealing assembly (9) includes a mounting bracket (901) and a rotating shaft (902) rotatably connected to the surface of the mounting bracket (901). The rotating shaft (902) has a first thread (9033), a second thread (9042) and a third thread (9051) arranged sequentially from top to bottom on its surface. The helical direction of the third thread (9051) is opposite to that of the first thread (9033) and the second thread (9042).

7. The sealing structure for dewatering wells in water-rich formations according to claim 6, characterized in that, The sealing assembly (9) also includes A first pressure ring (903) threadedly connected to the surface of the first thread (9033) and a first airbag (9031) fixed between the first pressure ring (903) and the upper surface of the mounting bracket (901). A second pressure ring (904) is threadedly connected to the surface of the second thread (9042) and a second airbag (9043) is disposed inside the cavity (9041), the cavity (9041) being opened inside the mounting bracket (901); The third pressure ring (905) is threaded onto the surface of the third thread (9051), and the third airbag (9052) is fixed between the third pressure ring (905) and the lower surface of the mounting bracket (901). The first airbag (9031), the second airbag (9043), and the third airbag (9052) respectively seal multiple connection points at the connection position between the well pipe (1) of the dewatering well and the plug steel pipe (3).

8. The sealing structure for dewatering wells in water-rich formations according to claim 6, characterized in that, The mounting bracket (901) has a groove on its lower surface for mounting the mounting bracket (901) on the top of the dewatering well pipe (1). Two positioning blocks (12) are fixed inside the groove. Two positioning slots (11) that cooperate with the positioning blocks (12) are opened on the top of the dewatering well pipe (1).

9. The sealing structure for dewatering wells in water-rich formations according to claim 1, characterized in that, The surface of the cushion layer (2) is provided with a recess for avoiding the well pipe (1) of the dewatering well. The recess is filled with concrete (7) and the filling height is flush with the upper surface of the cushion layer (2).

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