Device and method for repairing vertical shaft wall at damaged water burst section

Abstract

The invention discloses a damaged water gushing section vertical shaft wall repairing device and method, and relates to the technical field of mine construction engineering, the damaged water gushing section vertical shaft wall repairing device comprises a steel plate cylinder, the steel plate cylinder is fixedly arranged on the inner side of a to-be-repaired shaft wall through an anchor rod assembly, and a gap is reserved between the steel plate cylinder and the inner side of the to-be-repaired shaft wall; clamping grooves are formed in the top end and the bottom end of the outer side of the steel plate cylinder correspondingly, hydraulic expansion bags are arranged in the clamping grooves, the hydraulic expansion bag at the top end is located above the damaged section well wall, the hydraulic expansion bag at the bottom end is located below the damaged section well wall, and the two hydraulic expansion bags block the two ends of a gap between the steel plate cylinder and the well wall to be repaired. A sealing cavity is formed, and the sealing cavity is filled with a continuous filling layer. The sealing cavity is filled with the continuous filling layer, it is guaranteed that the integrity of the continuous filling layer is good, the defect of the damaged section of the well wall can be filled, and the water sealing performance and the bearing capacity of the repaired well wall are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mine construction engineering, and particularly to a vertical shaft wall repair device and method for a damaged water-inflow section. Background Art

[0002] Under the disturbance of mining, pumping or other industrial activities, the strata around the shaft may settle and deform relative to the shaft wall, resulting in the rupture of the shaft wall. When the rupture section is close to the aquifer, a large amount of water is likely to gush out from the shaft wall. In addition, when the shaft passes through a pore-microfracture water-bearing rock stratum, due to the poor injectability of the strata, the shaft wall concrete is generally poured against water during shaft sinking, and common molding quality defects exist. After completion, a large amount of water often gushes out from the shaft wall. The vertical shaft is the throat of the mine. How to repair the damaged section of the shaft wall and restore its bearing capacity and water sealing performance is an important technical issue related to the production and safety of the mine.

[0003] For a damaged shaft wall, the conventional repair plan is to process a channel steel into an arc-shaped shaft ring, stack and fix it on the shaft wall in layers and sections, and then spray concrete to make the shaft ring closely fit the shaft wall. In this technology, the overall stiffness of the shaft ring is small and the concrete strength is low, resulting in limited restoration of the bearing capacity of the shaft wall. In addition, the curing shrinkage of the sprayed concrete causes new cracks between the concrete and the shaft ring and between the concrete and the shaft wall, resulting in limited restoration of the water sealing performance of the repaired shaft wall.

[0004] The patent with the application number CN200520075443 discloses a shaft wall reinforcement device, which anchors a shaft ring (steel plate or section steel) to the shaft wall by bolts, and a gap is reserved between the shaft ring and the shaft wall and filled with concrete or other solid materials. From the above technical solution, the integrity of the filling material (generally concrete) between the shaft ring and the shaft wall is the key to determining the technical effect of this solution. If the integrity of the filled concrete is poor, on the one hand, it is difficult for the shaft ring and the filled concrete to effectively support the original shaft wall, and the bearing capacity of the repaired shaft wall is limited; on the other hand, groundwater can flow into the shaft through the voids in the filled concrete, the interface between the filled concrete and the shaft wall, and the interface between the filled concrete and the shaft ring, and the water sealing performance of the repaired shaft wall is limited. And in actual implementation, due to limited operating space, the shaft ring and the filling gap often need to be installed in sections along the axial direction of the shaft. There is a cold joint between the upper and lower sections of concrete. When the water inflow in the damaged section is large, it is not easy to ensure the filling quality and strength of the gap concrete under the action of water flow scouring. Therefore, for the damaged shaft wall with a large water inflow, the integrity of the gap filled with concrete in the repair range is poor, and the pores and cracks and other defects in the damaged shaft wall cannot be fully filled, thus limiting the restoration effect of the bearing capacity and water tightness of the repaired shaft wall. Summary of the Invention

[0005] In view of this, the present invention provides a repair device for the shaft wall in the damaged water-inflow section to solve the problems raised in the above-mentioned background technology, and specifically discloses the following content: A repair device for the shaft wall in the damaged water-inflow section includes a steel plate cylinder. The steel plate cylinder is fixedly arranged on the inner side of the shaft wall to be repaired through a bolt component, and there is a gap between the steel plate cylinder and the inner side of the shaft wall to be repaired. At the top and bottom of the outer side of the steel plate cylinder, there are clamping grooves. Hydraulic expansion bags are arranged in the clamping grooves. The hydraulic expansion bag at the top is located above the shaft wall in the damaged section, and the hydraulic expansion bag at the bottom is located below the shaft wall in the damaged section. The two hydraulic expansion bags seal both ends of the gap between the steel plate cylinder and the shaft wall to be repaired, forming a sealed cavity, and a continuous filling layer is filled in the sealed cavity.

[0006] Further, a water injection port for communicating with the water injection end of the hydraulic expansion bag is arranged on the inner side of the steel plate cylinder.

[0007] Further, a plurality of first grouting ports for communicating with the sealed cavity are arranged on the inner side of the steel plate cylinder from bottom to top.

[0008] Further, an annular grouting pipe is installed on the inner side of the shaft wall in the damaged section. The annular grouting pipe is located in the sealed cavity. A second grouting port for communicating with the grouting end of the annular grouting pipe and a slurry outlet for communicating with the slurry outlet end of the annular grouting pipe are arranged on the inner side of the steel plate cylinder.

[0009] Further, the bolt component includes a pre-embedded bolt and a post-embedded bolt. Both the top and bottom of the steel plate cylinder are fixed to the inner side of the intact shaft wall through the pre-embedded bolt, and the middle position of the steel plate cylinder is fixed to the inner side of the shaft wall in the damaged section through the post-embedded bolt.

[0010] Further, reinforcing ribs are arranged on the inner side of the steel plate cylinder.

[0011] Further, a plastic sealing material is filled between the clamping groove, the hydraulic expansion bag and the shaft wall to be repaired.

[0012] A repair method for the shaft wall in the damaged water-inflow section is realized by using the repair device for the shaft wall in the damaged water-inflow section described in any one of the above, and specifically includes the following steps: S1: Level and clean the inner surface of the shaft wall to be repaired, then install the temporary support of the steel plate cylinder, transport the prefabricated repair device components to the underground in batches, assemble and weld the steel plate cylinder layer by layer from bottom to top, and synchronously install the hydraulic expansion bag and the pre-embedded bolt. When installing, a plastic sealing material is filled between the clamping groove, the hydraulic expansion bag and the shaft wall to be repaired; S2: Tighten the pre - installed anchor bolts, inject water into the hydraulic expansion bag through the water injection port until the designed pressure is reached, so that it expands to seal both ends of the gap between the steel plate cylinder and the wellbore to be repaired, forming a sealed cavity. Keep the first grouting port open during water injection to drain the water gushing from the damaged section of the wellbore. After the water injection is completed, close the first grouting port from top to bottom, observe the sealing effect of the sealed cavity. By adjusting the tightening force of the pre - installed anchor bolts and the water injection pressure of the hydraulic expansion bag, after the sealing effect meets the requirements of grouting construction, close the water injection port; S3: Continuously grout into the sealed cavity from bottom to top through each layer of the first grouting ports to form a continuous filling layer. Keep the grouted first grouting ports closed and the un - grouted first grouting ports open during grouting; S4: After all the first grouting ports have been grouted, raise the grouting pressure to not less than the hydrostatic pressure of the grouting depth. From bottom to top, re - grout layer by layer through the first grouting ports. During the re - grouting process, keep all the non - grouting first grouting ports closed; S5: After the strength of the continuous filling layer reaches the requirements, install the post - installed anchor bolts, and then grout through the second grouting port by the annular grouting pipe to further fill the defects and seepage channels of the continuous filling layer, the damaged section of the wellbore and the interface between the two. After the grouting is completed, flush the annular grouting pipe and close the second grouting port and the slurry outlet.

[0013] The beneficial effects of the present invention are as follows: The present invention injects water into the hydraulic expansion bag through the water injection port until the designed pressure is reached, so that it expands to seal both ends of the gap between the steel plate cylinder and the wellbore to be repaired, forming a sealed cavity. Then, continuously grout into the sealed cavity to form a continuous filling layer, ensuring that the continuous filling layer has good integrity. And during the grouting process, the defects of the damaged section of the wellbore will also be filled with the slurry under a certain grouting pressure, significantly improving the water - sealing performance and bearing capacity of the repaired wellbore. An annular grouting pipe is installed on the inner side of the damaged section of the wellbore. After the continuous filling layer in the sealed cavity solidifies, supplementary grouting is carried out using the circumferential grouting pipe to strengthen the integrity of the continuous filling layer and further fill the defects of the damaged section of the wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order 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 use in the description of the embodiments or the prior art. Obviously, the following drawings 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 according to the provided drawings.

[0015] Figure 1 It is a schematic structural diagram of a repair device for a vertical shaft wellbore in a damaged water - gushing section of the present invention.

[0016] Among them, in the figure: 1 - Steel plate cylinder; 2 - Hydraulic expansion bag; 3 - First grouting port; 4 - Annular grouting pipe; 5 - Prefabricated bolt; 6 - Post - installed bolt; 7 - Continuous filling layer; 8 - Intact section of shaft wall; 81 - Damaged section of shaft wall. Detailed implementation manners

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or components does not necessarily limit 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.

[0019] 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 devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0020] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above - mentioned 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 specific circumstances.

[0021] In addition, the terms "install", "set", "be provided with", "connect", "be connected", "be sleeved" 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 internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in this application can be understood according to specific circumstances.

[0022] Example 1

[0023] Refer to the appendix Figure 1 , the present invention discloses a repair device for the shaft wall of a damaged water-inflow section, including a steel plate cylinder 1. The steel plate cylinder 1 is fixedly arranged on the inner side of the shaft wall to be repaired through an anchor rod assembly, and there is a gap between the steel plate cylinder 1 and the inner side of the shaft wall to be repaired; clamping grooves are arranged at both the top and bottom of the outer side of the steel plate cylinder 1, and a hydraulic expansion bag 2 is arranged in the clamping grooves. The hydraulic expansion bag 2 at the top is located above the damaged section of the shaft wall 81, and the hydraulic expansion bag 2 at the bottom is located below the damaged section of the shaft wall 81. The two hydraulic expansion bags 2 seal both ends of the gap between the steel plate cylinder 1 and the shaft wall to be repaired, forming a sealed cavity, and a continuous filling layer 7 is filled in the sealed cavity.

[0024] In this embodiment, the middle position of the shaft wall to be repaired is the damaged section of the shaft wall 81, and both the upper and lower parts of the damaged section of the shaft wall 81 are intact sections of the shaft wall 8.

[0025] In this embodiment, the material of the hydraulic expansion bag 2 is rubber or other materials with relatively large elasticity.

[0026] In this embodiment, the continuous filling layer 7 is formed by grouting.

[0027] In this embodiment, when the water inflow of the damaged section of the shaft wall 81 is large and the sealed cavity is not filled, it will be filled with water and the water is static or the flow rate is very small. At this time, it is possible to require injecting underwater non-dispersible slurry. Since the water flow rate in the sealed cavity is very small, the slurry is easy to form as a whole and the strength is easy to ensure.

[0028] An injection port for connecting the water injection end of the hydraulic expansion bag 2 is arranged on the inner side of the steel plate cylinder 1.

[0029] A plurality of first grouting ports for connecting the sealed cavity are arranged on the inner side of the steel plate cylinder 1 from bottom to top.

[0030] An annular grouting pipe 4 is installed on the inner side of the damaged section of the shaft wall 81. The annular grouting pipe 4 is located in the sealed cavity. An injection port for connecting the grouting end of the annular grouting pipe 4 and an outlet port for connecting the slurry outlet end of the annular grouting pipe 4 are arranged on the inner side of the steel plate cylinder 1.

[0031] In this embodiment, the annular grouting pipe 4 adopts a maintainable and reusable grouting pipe (after grouting, the pipeline is flushed and then grouting can be carried out again).

[0032] The anchor rod assembly includes a pre-embedded anchor rod 5 and a post-embedded anchor rod 6. Both the top and bottom of the steel plate cylinder 1 are fixed to the inner side of the intact section of the shaft wall 8 through the pre-embedded anchor rod 5, and the middle position of the steel plate cylinder 1 is fixed to the inner side of the damaged section of the shaft wall 81 through the post-embedded anchor rod 6.

[0033] Reinforcing ribs are arranged on the inner side of the steel plate cylinder 1.

[0034] A plastic sealing material is filled between the card slot, the hydraulic expansion bag 2 and the well wall to be repaired.

[0035] In this embodiment, the plastic sealing material is butter, clay or the like.

[0036] The grouting material in this embodiment should have properties such as high strength, slight expansion during the curing process, self-leveling and non-dispersion underwater, such as the cement-based grouting material in the prior art.

[0037] Embodiment 2

[0038] A method for repairing a vertical shaft wall in a damaged water-inflow section includes the following steps: S1: Level and clean the inner surface of the well wall to be repaired, then install the temporary support of the steel plate cylinder 1, transport the prefabricated repair device components to the well bottom in batches, assemble and weld the steel plate cylinder 1 layer by layer from bottom to top, synchronously install the hydraulic expansion bag 2 and the prior anchor 5. During installation, a plastic sealing material is filled between the card slot, the hydraulic expansion bag 2 and the well wall to be repaired; S2: Tighten the prior anchor 5, inject water into the hydraulic expansion bag 2 through the water injection port until the design pressure is reached, so that it expands to seal both ends of the gap between the steel plate cylinder 1 and the well wall to be repaired, forming a sealed cavity. Keep the first grouting port 3 open during the water injection to discharge the water inflow from the damaged section of the well wall 81. After the water injection is completed, close the first grouting port 3 from top to bottom, observe the sealing effect of the sealed cavity, and adjust the tightening force of the prior anchor 5 and the water injection pressure of the hydraulic expansion bag 2. After the sealing effect meets the requirements of the grouting construction, close the water injection port; S3: Continuously grout into the sealed cavity through each layer of the first grouting port 3 from bottom to top to form a continuous filling layer 7. Keep the grouted first grouting port 3 closed and the ungrouted first grouting port 3 open during the grouting; S4: After all the first grouting ports 3 have been grouted, raise the grouting pressure to not less than the hydrostatic pressure of the grouting depth, and re-grout layer by layer through the first grouting port 3 from bottom to top. During the re-grouting process, keep all the non-grouting first grouting ports 3 closed; S5: After the strength of the continuous filling layer 7 reaches the requirements, install the post-anchor 6, and then grout through the second grouting port by the annular grouting pipe 4 to further fill the defects and permeation channels of the continuous filling layer 7, the damaged section of the well wall 81 and the interface between the two. After the grouting is completed, wash the annular grouting pipe 4 and close the second grouting port and the slurry outlet.

[0039] During the subsequent use process, the second grouting port can be opened to regularly observe whether there is water seepage in the damaged section of the well wall 81. If a new water outlet point is found, the annular grouting pipe 4 can be used to repeat the grouting.

[0040] The above are only the preferred embodiments of the present application and are not intended 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 within the protection scope of the present application.

Claims

1. A repair device for the shaft wall of a vertical shaft in a damaged and water-inflow section, characterized in that, It includes a steel plate cylinder (1), and the steel plate cylinder (1) is fixedly arranged on the inner side of the shaft wall to be repaired through an anchor rod assembly, with a gap left between the steel plate cylinder (1) and the inner side of the shaft wall to be repaired; clamping grooves are arranged at both the top and bottom of the outer side of the steel plate cylinder (1), and a hydraulic expansion bag (2) is arranged in the clamping grooves. The hydraulic expansion bag (2) at the top is located above the damaged section of the shaft wall (81), and the hydraulic expansion bag (2) at the bottom is located below the damaged section of the shaft wall (81). The two hydraulic expansion bags (2) seal both ends of the gap between the steel plate cylinder (1) and the shaft wall to be repaired, forming a sealed cavity, and a continuous filling layer (7) is filled in the sealed cavity.

2. The shaft wall repair device for the damaged water-inflow section according to claim 1, wherein, A water injection port for communicating with the water injection end of the hydraulic expansion bag (2) is arranged on the inner side of the steel plate cylinder (1).

3. The shaft wall repair device for a damaged water-inflow section according to claim 1, wherein, A plurality of first grouting ports for communicating with the sealed cavity are arranged on the inner side of the steel plate cylinder (1) from bottom to top.

4. A repair device for the vertical shaft wall in the damaged water-inflow section according to claim 1, characterized in that, An annular grouting pipe (4) is installed on the inner side of the damaged section of the shaft wall (81), and the annular grouting pipe (4) is located in the sealed cavity. A second grouting port for communicating with the grouting end of the annular grouting pipe (4) and a slurry outlet for communicating with the slurry outlet end of the annular grouting pipe (4) are arranged on the inner side of the steel plate cylinder (1).

5. A repair device for a vertical shaft wall in a damaged water-inflow section, according to claim 1, wherein, The anchor rod assembly includes a pre - installed anchor rod (5) and a post - installed anchor rod (6). Both the top and bottom of the steel plate cylinder (1) are fixed to the inner side of the intact section of the shaft wall (8) through the pre - installed anchor rod (5), and the middle position of the steel plate cylinder (1) is fixed to the inner side of the damaged section of the shaft wall (81) through the post - installed anchor rod (6).

6. The shaft wall repair device for a damaged and water-inflow section according to claim 1, wherein Reinforcing ribs are arranged on the inner side of the steel plate cylinder (1).

7. A repair device for a vertical shaft wall in a damaged water-inflow section according to claim 1, characterized in that, A plastic sealing material is filled between the clamping groove, the hydraulic expansion bag (2) and the shaft wall to be repaired.

8. A method for repairing the shaft wall in a damaged and water-inflow section, characterized in that, It is realized by using a repair device for a vertical shaft wall in a damaged water - gushing section according to any one of claims 1 - 7 above, and specifically includes the following steps: S1: Level and clean the inner surface of the shaft wall to be repaired, then install a temporary support for the steel plate cylinder (1), transport the pre - fabricated repair device components to the underground in batches, assemble and weld the steel plate cylinder (1) layer by layer from bottom to top, and synchronously install the hydraulic expansion bag (2) and the pre - installed anchor rod (5). When installing, a plastic sealing material is filled between the clamping groove, the hydraulic expansion bag (2) and the shaft wall to be repaired; S2: Tighten the pre - installed anchor rod (5), inject water into the hydraulic expansion bag (2) through the water injection port until the design pressure is reached, so that it expands to seal both ends of the gap between the steel plate cylinder (1) and the shaft wall to be repaired, forming a sealed cavity. Keep the first grouting port (3) open during the water injection to discharge the water gushing from the damaged section of the shaft wall (81). After the water injection is completed, close the first grouting port (3) from top to bottom, observe the sealing effect of the sealed cavity, and by adjusting the tightening force of the pre - installed anchor rod (5) and the water injection pressure of the hydraulic expansion bag (2), after the sealing effect meets the requirements of grouting construction, close the water injection port; S3: Continuously grout into the sealed cavity through each layer of the first grouting port (3) from bottom to top to form a continuous filling layer (7). Keep the grouted first grouting port (3) closed and the un - grouted first grouting port (3) open during the grouting; S4: After grouting all the first grouting ports (3), increase the grouting pressure to not less than the hydrostatic pressure of the grouting depth, and perform secondary grouting layer by layer from bottom to top through the first grouting ports (3). During the secondary grouting process, keep all the first grouting ports (3) that are not grouting closed; S5: After the strength of the continuous filling layer (7) reaches the requirement, install the post-anchors (6), and then grout through the second grouting port by the annular grouting pipe (4) to further fill the defects and seepage channels of the continuous filling layer (7), the damaged section of the shaft wall (81) and the interface between the two. After the grouting is completed, flush the annular grouting pipe (4), and close the second grouting port and the slurry outlet.

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