Well wall pressure relief groove waterproof device and construction method

Abstract

The invention discloses a well wall pressure relief groove waterproof device and a construction method, and relates to the technical field of mine construction engineering.The well wall pressure relief groove waterproof device comprises a supporting cylinder structure, the supporting cylinder structure comprises an upper supporting cylinder and a lower supporting cylinder which are sequentially arranged from top to bottom, and the upper supporting cylinder and the lower supporting cylinder are connected through a retractable connecting piece; the retractable connecting piece and the pressure relief groove are correspondingly arranged, the top end of the upper supporting cylinder is fixedly arranged on the inner side of the well wall above the pressure relief groove through the supporting anchoring piece, the upper sealing structure is used for blocking a gap between the upper supporting cylinder and the well wall and forming a first upper sealing cavity, and the first upper sealing cavity is filled with a filling medium. The bottom end of the lower supporting cylinder is fixedly arranged on the inner side of the well wall below the pressure relief groove through a supporting anchoring part, the lower sealing structure is used for blocking a gap between the lower supporting cylinder and the well wall and forming a first lower sealing cavity, and the first lower sealing cavity is filled with a filling medium. The retractable connecting piece and the pressure relief groove can be compressed together, reliable sealing is always achieved in the compression process, and underground water pressure can be resisted.

Description

Technical Field

[0001] The present invention relates to the technical field of mine construction engineering, and in particular to a waterproof device and construction method for a pressure relief groove on a shaft wall. Background Art

[0002] The method of opening a pressure relief groove is currently the main method for treating the disaster of shaft wall rupture in deep alluvial soil layers. Its technical principle is to excavate a horizontal annular groove at the designed position of the shaft wall, and install a compressible structure or material in the groove, so that the shaft wall can sink with the formation, in order to reduce the vertical additional force on the shaft wall.

[0003] Currently, the most commonly used compressible structure is pine wood blocks treated with anti-corrosion. When installed, they are stacked in layers and are not waterproof by themselves. To prevent groundwater and sand from flowing into the well from the pressure relief groove, wall - to - wall (post - grouting) needs to be carried out above and below the pressure relief groove during construction to ensure the water - sealing performance of the shaft wall. However, the interaction between the shaft wall and the formation is very complex, and the compression process of the pressure relief groove is also a process of stress redistribution in the nearby shaft wall and formation. During this period, new seepage channels may be formed in both the shaft wall and the formation, and the originally grouted - sealed channels may also become permeable again due to the change in the stress state. In addition, the anti - corrosion layer of the pine wood blocks may be damaged due to stress during the compression process of the pressure relief groove, resulting in anti - corrosion failure, and thus new seepage channels are formed in the pressure relief groove due to corrosion.

[0004] Therefore, the currently commonly used in - well grouting technology cannot reliably guarantee the waterproof performance of the pressure relief groove during the entire working process. Summary of the Invention

[0005] In view of this, the present invention provides a waterproof device and construction method for a pressure relief groove on a shaft wall to solve the problems raised in the above - mentioned background art, and specifically discloses the following content: A waterproof device for a pressure relief groove on a shaft wall, comprising a support cylinder structure. The support cylinder structure includes an upper support cylinder and a lower support cylinder arranged in sequence from top to bottom. The upper support cylinder and the lower support cylinder are connected by a retractable connecting piece. The retractable connecting piece is arranged corresponding to the pressure relief groove. The top end of the upper support cylinder is fixedly arranged on the inner side of the shaft wall above the pressure relief groove through a support anchor, and there is a gap between it and the shaft wall. An upper sealing structure is arranged at the end of the upper support cylinder close to the retractable connecting piece for sealing the gap between the upper support cylinder and the shaft wall and forming a first upper sealing cavity. The first upper sealing cavity is filled with a filling medium. The bottom end of the lower support cylinder is fixedly arranged on the inner side of the shaft wall below the pressure relief groove through a support anchor, and there is a gap between it and the shaft wall. A lower sealing structure is arranged at the end of the lower support cylinder close to the retractable connecting piece for sealing the gap between the lower support cylinder and the shaft wall and forming a first lower sealing cavity. The first lower sealing cavity is filled with a filling medium.

[0006] Further, the upper sealing structure includes a first upper hydraulic seal. A first upper card slot is provided at an end of the upper support cylinder close to the retractable connector. The first upper hydraulic seal is arranged in the first upper card slot. A first upper water injection port is arranged inside the upper support cylinder and is used for communicating with the water injection end of the first upper hydraulic seal.

[0007] Further, sealing anchors are provided above and below the first upper card slot and are used for connecting the upper support cylinder and the well wall.

[0008] Further, the lower sealing structure includes a first lower hydraulic seal. A first lower card slot is provided at an end of the lower support cylinder close to the retractable connector. The first lower hydraulic seal is arranged in the first lower card slot. A first lower water injection port is arranged inside the lower support cylinder and is used for communicating with the water injection end of the first lower hydraulic seal.

[0009] Further, sealing anchors are provided above and below the first lower card slot and are used for connecting the lower support cylinder and the well wall.

[0010] Further, the retractable connector includes a sliding cylinder and a fixed cylinder. The diameter of the upper support cylinder is larger than that of the lower support cylinder. The top end of the sliding cylinder is fixedly connected to the bottom end of the upper support cylinder. An upper bending part is arranged on the side of the sliding cylinder close to the lower support cylinder. The bottom end of the fixed cylinder is fixedly connected to the top end of the lower support cylinder. A lower bending part is arranged on the side of the fixed cylinder close to the upper support cylinder. The upper bending part of the sliding cylinder and the lower bending part of the fixed cylinder are arranged in an alternating manner with a gap left therebetween. A second upper card slot is arranged at a position of the sliding cylinder close to the lower bending part of the fixed cylinder. A second upper hydraulic seal is arranged in the second upper card slot. A second lower card slot is arranged at a position of the fixed cylinder close to the upper bending part of the sliding cylinder. A second lower hydraulic seal is arranged in the second lower card slot. The second upper hydraulic seal and the second lower hydraulic seal respectively seal both ends of the gap between the upper bending part of the sliding cylinder and the lower bending part of the fixed cylinder, forming a second sealing cavity. The second sealing cavity is filled with a sealing medium.

[0011] Further, a grouting port for communicating with the second sealing cavity is arranged at the top of the fixed cylinder.

[0012] Further, a second upper water injection port for communicating with the water injection end of the second upper hydraulic seal is arranged on the sliding cylinder.

[0013] Further, a second lower water injection port for communicating with the water injection end of the second lower hydraulic seal is arranged on the fixed cylinder.

[0014] A waterproof construction method for a well wall pressure relief groove is realized by using the waterproof device for a well wall pressure relief groove described in any one of the above. The specific steps are as follows: S1: Level and clean the inner surface of the shaft wall above and below the pressure relief groove, and install the temporary bottom seal and support components of the lower support cylinder. S2: Assemble and weld the lower support cylinder in layers and sections from bottom to top, anchor the lower support cylinder to the shaft wall below the pressure relief groove through support anchor bolts, and pour filling medium into the gap between the lower support cylinder and the shaft wall. S3: Assemble and weld the part of the lower support cylinder with the first lower card slot in sections. After completion, install the first lower hydraulic seal. After welding the entire lower support cylinder, install the seal anchor bolts. S4: Continue to assemble and weld the upper support cylinder in layers and sections, anchor the upper support cylinder to the shaft wall above the pressure relief groove through support anchor bolts, synchronously install the first upper hydraulic seal, and inject part of the water into the first upper hydraulic seal through the first upper water injection port to block the gap between the upper support cylinder and the shaft wall and form the first upper seal cavity. Pour filling medium into the first upper seal cavity, and finally install the seal anchor bolts. S5: Assemble and weld the sliding cylinder in sections, weld the top end of the sliding cylinder to the bottom end of the upper support cylinder, and install the second upper hydraulic seal in the second upper card slot. S6: Assemble and weld the fixed cylinder in sections, install the second lower hydraulic seal in the second lower card slot, buckle the lower bent part of the fixed cylinder into the upper bent part of the sliding cylinder according to the design position, stagger the two and leave a gap, and then weld the bottom end of the fixed cylinder to the top end of the lower support cylinder. S7: Inject water into the second lower hydraulic seal through the second lower water injection port to the design pressure, inject water into the second upper hydraulic seal through the second upper water injection port to the design pressure. The second upper hydraulic seal and the second lower hydraulic seal are respectively blocked, and both ends of the gap between the upper bent part of the sliding cylinder and the lower bent part of the fixed cylinder are formed into the second seal cavity. Inject the sealing medium into the second seal cavity through the grouting hole at the top of the fixed cylinder. S8: Inject water into the first upper hydraulic seal through the first upper water injection port to the design pressure, inject water into the first lower hydraulic seal through the first lower water injection port to the design pressure.

[0015] The beneficial effects of the present invention are as follows: Through the vertical displacement of the sliding cylinder and the fixed cylinder in the retractable connecting piece, the present invention realizes the compression of the waterproof device and the pressure relief groove together. First, a first waterproof seal is formed by the second upper hydraulic seal, the second lower hydraulic seal and the sealing medium, and then a second waterproof seal is formed by the first upper hydraulic seal, the second lower hydraulic seal and the filling medium, realizing multiple waterproof seals of the waterproof device during the compression of the pressure relief groove, which can significantly improve the waterproof performance of the pressure relief groove during the compression process and ensure the safety of the shaft. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0017] Figure 1 It is a longitudinal sectional view of a waterproof device for a wellbore pressure relief groove of the present invention.

[0018] Figure 2 It is a structural schematic diagram of a retractable connector in the present invention.

[0019] Among them, in the figure: 1 - retractable connector; 11 - sliding cylinder; 12 - fixed cylinder; 131 - second upper hydraulic seal; 132 - second lower hydraulic seal; 14 - sealing medium; 21 - upper support cylinder; 22 - lower support cylinder; 31 - first upper hydraulic seal; 32 - first lower hydraulic seal; 4 - sealing anchor; 5 - support anchor; 6 - filling medium; 7 - wellbore; 8 - pressure relief groove. Detailed implementation manners

[0020] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so as to describe the embodiments of this application here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or components does not necessarily have to be limited to those steps or components clearly listed, but may include other steps or components not clearly listed or inherent to these processes, methods, products or devices.

[0022] In this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element, or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0023] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0024] In addition, the terms "installed", "set", "provided with", "connected", "connected to", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0025] Embodiment 1

[0026] Referring to the attached Figure 1-2 , the present invention discloses a waterproof device for a wellbore pressure relief groove, including a support cylinder structure. The support cylinder structure includes an upper support cylinder 21 and a lower support cylinder 22 arranged in sequence from top to bottom. The upper support cylinder 21 and the lower support cylinder 22 are connected by a retractable connecting piece 1. The retractable connecting piece 1 is correspondingly arranged with the pressure relief groove 8. The top end of the upper support cylinder 21 is fixedly arranged on the inner side of the wellbore 7 above the pressure relief groove 8 through a support anchor 5, and there is a gap between it and the wellbore 7. An upper sealing structure is arranged at the end position of the upper support cylinder 21 close to the retractable connecting piece 1, for sealing the gap between the upper support cylinder 21 and the wellbore 7 and forming a first upper sealing cavity. The first upper sealing cavity is filled with a filling medium 6. The bottom end of the lower support cylinder 22 is fixedly arranged on the inner side of the wellbore 7 below the pressure relief groove 8 through a support anchor 5, and there is a gap between it and the wellbore 7. A lower sealing structure is arranged at the end position of the lower support cylinder 22 close to the retractable connecting piece 1, for sealing the gap between the lower support cylinder 22 and the wellbore 7 and forming a first lower sealing cavity. The first lower sealing cavity is filled with a filling medium 6.

[0027] In this embodiment, the filling medium 6 is formed by pouring a grouting material with properties such as high strength, slight expansion after curing, and high fluidity, such as a cement-based grouting material in the prior art.

[0028] In this embodiment, both the upper support cylinder 21 and the lower support cylinder 22 are fabricated from steel plates in sections and welded on site. The quantity and arrangement of the support anchorages 5 in the circumferential and vertical directions are determined according to the actual conditions.

[0029] The upper sealing structure includes a first upper hydraulic seal 31. At the end of the upper support cylinder 21 close to the retractable connector 1, a first upper clamping groove is provided. The first upper hydraulic seal 31 is arranged in the first upper clamping groove. An upper first water injection port is provided inside the upper support cylinder 21 for connecting the water injection end of the first upper hydraulic seal 31.

[0030] Sealing anchorages 4 are provided both above and below the first upper clamping groove for connecting the upper support cylinder 21 and the shaft wall 7.

[0031] In this embodiment, the arrangement of the upper and lower rows of sealing anchorages 4 is used to reliably provide a reaction force when the first upper hydraulic seal 31 expands by water injection, and can also prevent excessive deformation of the upper support cylinder 21 near the first upper hydraulic seal 31 under the action of groundwater pressure, resulting in sealing failure. The circumferential arrangement and quantity of each row of sealing anchorages 4 are determined according to the actual conditions.

[0032] The lower sealing structure includes a first lower hydraulic seal 32. At the end of the lower support cylinder 22 close to the retractable connector 1, a first lower clamping groove is provided. The first lower hydraulic seal 32 is arranged in the first lower clamping groove. A lower first water injection port is provided inside the lower support cylinder 22 for connecting the water injection end of the first lower hydraulic seal 32.

[0033] Sealing anchorages 4 are provided both above and below the first lower clamping groove for connecting the lower support cylinder 22 and the shaft wall 7.

[0034] In this embodiment, the arrangement of the upper and lower rows of sealing anchorages 4 is used to reliably provide a reaction force when the first lower hydraulic seal 32 expands by water injection, and can also prevent excessive deformation of the lower support cylinder 22 near the first lower hydraulic seal 32 under the action of groundwater pressure, resulting in sealing failure. The circumferential arrangement and quantity of each row of sealing anchorages 4 are determined according to the actual conditions.

[0035] In this embodiment, the arrangement of the upper and lower rows of sealing anchorages 4 is used to reliably provide a reaction force when the first upper hydraulic seal 31 expands by water injection, and can also prevent excessive deformation of the upper support cylinder 21 near the hydraulic seal 31 under the action of groundwater pressure, resulting in sealing failure. The circumferential arrangement and quantity of each row of sealing anchorages 4 are determined according to the actual conditions.

[0036] The retractable connecting piece 1 includes a sliding cylinder 11 and a fixed cylinder 12. The diameter of the upper support cylinder 21 is larger than that of the lower support cylinder 22. The top end of the sliding cylinder 11 is fixedly connected to the bottom end of the upper support cylinder 21. An upper bending part is provided on one side of the sliding cylinder 11 close to the lower support cylinder 22. The bottom end of the fixed cylinder 12 is fixedly connected to the top end of the lower support cylinder 22. A lower bending part is provided on one side of the fixed cylinder 12 close to the upper support cylinder 21. The upper bending part of the sliding cylinder 11 and the lower bending part of the fixed cylinder 12 are arranged in an interleaved manner with a gap therebetween. A second upper clamping groove is provided at the position of the sliding cylinder 11 close to the lower bending part of the fixed cylinder 12. A second upper hydraulic seal 131 is arranged in the second upper clamping groove. A second lower clamping groove is provided at the position of the fixed cylinder 12 close to the upper bending part of the sliding cylinder 11. A second lower hydraulic seal 132 is arranged in the second lower clamping groove. The second upper hydraulic seal 131 and the second lower hydraulic seal 132 respectively seal both ends of the gap between the bending part of the sliding cylinder 11 and the bending part of the fixed cylinder 12, forming a second sealing cavity. The second sealing cavity is filled with a sealing medium 14.

[0037] In this embodiment, the sealing medium 14 is made of a grease material with a lubricating effect, such as butter.

[0038] In this embodiment, the vertical sliding stroke between the upper bending part of the sliding cylinder 11 and the lower bending part of the fixed cylinder 12 should be not less than the designed compression amount of the pressure relief groove.

[0039] A grouting port for communicating with the second sealing cavity is provided at the top of the fixed cylinder 12.

[0040] A second upper water injection port for communicating with the water injection end of the second upper hydraulic seal 131 is provided on the sliding cylinder 11.

[0041] A second lower water injection port for communicating with the water injection end of the second lower hydraulic seal 132 is provided on the fixed cylinder 12.

[0042] In this embodiment, the first upper hydraulic seal 31, the first lower hydraulic seal 32, the second upper hydraulic seal 131 and the second lower hydraulic seal 132 are all made of rubber or other materials with relatively large elasticity, are hollow tubular, are provided with water injection joints at the water injection ends, and can generate large expansion deformation after being filled with water inside.

[0043] In this embodiment, pressure measuring devices (such as pressure gauges) are installed at the water injection ends of the first upper hydraulic seal 31, the first lower hydraulic seal 32, the second upper hydraulic seal 131 and the second lower hydraulic seal 132, and the internal water pressure is maintained at the designed value according to the pressure measurement values.

[0044] Embodiment 2

[0045] A waterproof construction method for the pressure relief groove of the well wall specifically includes the following steps: S1: Level and clean the inner surface of the shaft wall 7 above and below the pressure relief groove 8, and install the temporary bottom seal and support member of the lower support cylinder 22; S2: Assemble and weld the lower support cylinder 22 layer by layer and section by section from bottom to top, anchor the lower support cylinder 22 to the shaft wall 7 below the pressure relief groove 8 through the support anchor 5, and pour the filling medium 6 into the gap between the lower support cylinder 22 and the shaft wall 7; S3: Assemble and install the part of the lower support cylinder 22 with the first lower card slot section by section. After completion, install the first lower hydraulic seal 32. After welding the entire lower support cylinder 22, install the seal anchor 4; S4: Continue to assemble and weld the upper support cylinder 21 layer by layer and section by section. Anchor the upper support cylinder 21 to the shaft wall 7 above the pressure relief groove 8 through the support anchor 5, synchronously install the first upper hydraulic seal 31, and inject part of the water into the first upper hydraulic seal 31 through the first upper water injection port to block the gap between the upper support cylinder 21 and the shaft wall 7 and form the first upper seal cavity. Pour the filling medium 6 into the first upper seal cavity, and finally install the seal anchor 4; S5: Assemble and install the sliding cylinder 11 section by section, and weld the top end of the sliding cylinder 11 to the bottom end of the upper support cylinder 21, and install the second upper hydraulic seal 131 in the second upper card slot; S6: Assemble and install the fixed cylinder 12 section by section, install the second lower hydraulic seal 132 in the second lower card slot, buckle the lower bent part of the fixed cylinder 12 into the upper bent part of the sliding cylinder 11 according to the design position, and stagger them with a gap, and then weld the bottom end of the fixed cylinder 12 to the top end of the lower support cylinder 22; S7: Inject water into the second lower hydraulic seal 132 through the second lower water injection port to the design pressure, inject water into the second upper hydraulic seal 131 through the second upper water injection port to the design pressure. The second upper hydraulic seal 131 and the second lower hydraulic seal 132 are respectively blocked at both ends of the gap between the upper bent part of the sliding cylinder 11 and the lower bent part of the fixed cylinder 12 to form the second seal cavity, and inject the sealing medium 14 into the second seal cavity through the grouting hole at the top of the fixed cylinder 12; S8: Inject water into the first upper hydraulic seal 31 through the first upper water injection port to the design pressure, and inject water into the first lower hydraulic seal 32 through the first lower water injection port to the design pressure.

[0046] In this embodiment, when the pressure relief groove 8 is compressed, the lower shaft wall basically does not move, and the lower support cylinder 22 and the fixed cylinder 12 anchored to the lower shaft wall remain fixed. The upper shaft wall sinks, and the upper support cylinder 21 anchored to the upper shaft wall drives the sliding cylinder 11 to slide down. Since the grease-like sealing medium 14 itself has a lubricating effect, the sliding resistance between the sliding cylinder 11 and the fixed cylinder 12 is very small.

[0047] After water injection and expansion, the first upper hydraulic seal 31 and the solidified filling medium 6 can seal the gap between the upper support cylinder 21 and the wellbore. After water injection and expansion, the first lower hydraulic seal 32 and the solidified filling medium 6 can seal the gap between the lower support cylinder 22 and the wellbore. During the entire service period, both the first upper hydraulic seal 31 and the first lower hydraulic seal 32 can adjust and control the water pressure inside them to ensure their sealing effect. After the material of the filling medium 6 solidifies, it slightly expands, so that both the upper support cylinder 21 and the lower support cylinder 22 have pre-compressive stress with the wellbore, ensuring the sealing performance. The high strength and high performance make the permeability of the filling medium 6 itself very low, ensuring its waterproof property. The combined action of the first upper hydraulic seal 31, the first lower hydraulic seal 32 and the filling medium 6 can effectively prevent the groundwater from flowing into the well along the vertical direction between the self-relieving pressure groove and the wellbore and entering the well.

[0048] The connection between the retractable connector 1 and the upper support cylinder 21 and the lower support cylinder 22 is waterproof. The sliding cylinder 11 and the fixed cylinder 12 are waterproof by themselves. The second upper hydraulic seal 131, the second lower hydraulic seal 132 and the sealing medium 14 ensure that groundwater does not flow into the well from the connection between the sliding cylinder 11 and the fixed cylinder 12. Under the action of groundwater pressure, the sliding cylinder 11 may deform towards the well. At this time, the second upper hydraulic seal 131 is pressed by the sliding cylinder 11, which can increase the sealing effect. In this way, even if the second lower hydraulic seal 132 fails, the upper hydraulic seal 13 and the sealing medium 14 can still jointly ensure the waterproof effect. When the sliding cylinder 11 slides down, it can still maintain a good sealing effect. During the sliding process, the space of the second sealing cavity will become larger. At this time, grouting can be carried out through the grouting hole to ensure that the sealing medium 14 fills the second sealing cavity. In addition, both the second upper hydraulic seal 131 and the second lower hydraulic seal 132 can adjust and control the water pressure inside them to ensure their sealing effect.

[0049] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A waterproof device for a wellbore pressure relief groove, characterized in that It includes a support cylinder structure, and the support cylinder structure includes an upper support cylinder (21) and a lower support cylinder (22) arranged in sequence from top to bottom. The upper support cylinder (21) and the lower support cylinder (22) are connected by a retractable connecting piece (1). The retractable connecting piece (1) is arranged corresponding to a pressure relief groove (8). The top end of the upper support cylinder (21) is fixedly arranged on the inner side of the wellbore wall (7) above the pressure relief groove (8) through a support anchor (5), and there is a gap between it and the wellbore wall (7). An upper sealing structure is arranged at the end position of the upper support cylinder (21) close to the retractable connecting piece (1) for sealing the gap between the upper support cylinder (21) and the wellbore wall (7) and forming a first upper sealing cavity. The first upper sealing cavity is filled with a filling medium (6). The bottom end of the lower support cylinder (22) is fixedly arranged on the inner side of the wellbore wall (7) below the pressure relief groove (8) through a support anchor (5), and there is a gap between it and the wellbore wall (7). A lower sealing structure is arranged at the end position of the lower support cylinder (22) close to the retractable connecting piece (1) for sealing the gap between the lower support cylinder (22) and the wellbore wall (7) and forming a first lower sealing cavity. The first lower sealing cavity is filled with a filling medium (6).

2. The waterproof device for the wellbore pressure-relief groove according to claim 1, wherein The upper sealing structure includes a first upper hydraulic seal (31). A first upper clamping groove is arranged at the end position of the upper support cylinder (21) close to the retractable connecting piece (1). The first upper hydraulic seal (31) is arranged in the first upper clamping groove. A first upper water injection port is arranged inside the upper support cylinder (21) for communicating with the water injection end of the first upper hydraulic seal (31).

3. The waterproof device for the wellbore pressure relief groove according to claim 2, characterized in that, Sealing anchors (4) are arranged above and below the first upper clamping groove for connecting the upper support cylinder (21) and the wellbore wall (7).

4. The waterproof device for the wellbore pressure relief groove according to claim 1, wherein The lower sealing structure includes a first lower hydraulic seal (32). A first lower clamping groove is arranged at the end position of the lower support cylinder (22) close to the retractable connecting piece (1). The first lower hydraulic seal (32) is arranged in the first lower clamping groove. A first lower water injection port is arranged inside the lower support cylinder (22) for communicating with the water injection end of the first lower hydraulic seal (32).

5. The waterproof device for the wellbore pressure relief groove according to claim 4, characterized in that, Sealing anchors (4) are arranged above and below the first lower clamping groove for connecting the lower support cylinder (22) and the wellbore wall (7).

6. The waterproof device for the wellbore pressure relief groove according to claim 1, characterized in that, The retractable connecting piece (1) includes a sliding cylinder (11) and a fixed cylinder (12). The diameter of the upper support cylinder (21) is larger than that of the lower support cylinder (22). The top end of the sliding cylinder (11) is fixedly connected to the bottom end of the upper support cylinder (21). An upper bending part is arranged on one side of the sliding cylinder (11) close to the lower support cylinder (22). The bottom end of the fixed cylinder (12) is fixedly connected to the top end of the lower support cylinder (22). A lower bending part is arranged on one side of the fixed cylinder (12) close to the upper support cylinder (21). The upper bending part of the sliding cylinder (11) and the lower bending part of the fixed cylinder (12) are arranged in an alternating manner with a gap therebetween. A second upper clamping groove is arranged at the position of the sliding cylinder (11) close to the lower bending part of the fixed cylinder (12). A second upper hydraulic seal (131) is arranged in the second upper clamping groove. A second lower clamping groove is arranged at the position of the fixed cylinder (12) close to the upper bending part of the sliding cylinder (11). A second lower hydraulic seal (132) is arranged in the second lower clamping groove. The second upper hydraulic seal (131) and the second lower hydraulic seal (132) respectively seal both ends of the gap between the upper bending part of the sliding cylinder (11) and the lower bending part of the fixed cylinder (12), forming a second sealing cavity. The second sealing cavity is filled with a sealing medium (14).

7. A waterproof device for a wellbore pressure relief groove according to claim 6, wherein A grouting port for communicating with the second sealing cavity is arranged at the top of the fixed cylinder (12).

8. The waterproof device for the wellbore pressure relief groove according to claim 6, characterized in that, A second upper water injection port for communicating with the water injection end of the second upper hydraulic seal (131) is arranged on the sliding cylinder (11).

9. The waterproof device for the pressure relief groove on the shaft wall according to claim 6, characterized in that, A second lower water injection port for communicating with the water injection end of the second lower hydraulic seal (132) is arranged on the fixed cylinder (12).

10. A waterproof construction method for a wellbore pressure relief groove, characterized in that, It is realized by using the wellbore pressure relief groove waterproof device according to any one of claims 1-9 above, and specifically includes the following steps: S1: Level and clean the inner surfaces of the wellbore (7) above and below the pressure relief groove (8), and install the temporary bottom seal and supporting parts of the lower support cylinder (22). S2: Assemble and weld the lower support cylinder (22) layer by layer and section by section from bottom to top. Anchor the lower support cylinder (22) to the wellbore (7) below the pressure relief groove (8) through the support anchor parts (5), and pour a filling medium (6) into the gap between the lower support cylinder (22) and the wellbore (7). S3: Assemble and weld the part of the lower support cylinder (22) provided with the first lower clamping groove section by section. After completion, install the first lower hydraulic seal (32). After welding the entire lower support cylinder (22), install the seal anchor parts (4). S4: Continue to assemble and weld the upper support cylinder (21) layer by layer and section by section. Anchor the upper support cylinder (21) to the wellbore (7) above the pressure relief groove (8) through the support anchor parts (5). Synchronously install the first upper hydraulic seal (31), and inject a part of water into the first upper hydraulic seal (31) through the first upper water injection port to seal the gap between the upper support cylinder (21) and the wellbore (7) and form a first upper sealing cavity. Pour a filling medium (6) into the first upper sealing cavity, and finally install the seal anchor parts (4). S5: Assemble the sliding cylinder (11) in sections, weld the top end of the sliding cylinder (11) to the bottom end of the upper support cylinder (21), and install the second upper hydraulic seal (131) in the second upper card slot; S6: Assemble the fixed cylinder (12) in sections, install the second lower hydraulic seal (132) in the second lower card slot, buckle the lower bent part of the fixed cylinder (12) into the upper bent part of the sliding cylinder (11) according to the designed position, arrange them staggered with a gap, and then weld the bottom end of the fixed cylinder (12) to the top end of the lower support cylinder (22); S7: Inject water into the second lower hydraulic seal (132) through the second lower water injection port until the designed pressure is reached, inject water into the second upper hydraulic seal (131) through the second upper water injection port until the designed pressure is reached. The second upper hydraulic seal (131) and the second lower hydraulic seal (132) are respectively blocked, and both ends of the gap between the upper bent part of the sliding cylinder (11) and the lower bent part of the fixed cylinder (12) form a second sealing cavity. Inject the sealing medium (14) into the second sealing cavity through the grouting hole at the top of the fixed cylinder (12); S8: Inject water into the first upper hydraulic seal (31) through the first upper water injection port until the designed pressure is reached, and inject water into the first lower hydraulic seal (32) through the first lower water injection port until the designed pressure is reached.

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