Detachable relief well

Abstract

The utility model relates to a detachable relief well, and relates to the technical field of foundation pit dewatering construction, in order to solve the problem that filter holes in a filter pipe can be blocked by fine sand, and consequently the pipe wall of the filter pipe is blocked, the detachable relief well comprises a relief well body, an inner well pipe and an outer well pipe are arranged in the relief well body, and the inner well pipe is arranged in the inner wall of the outer well pipe in a sliding mode; a plurality of filtering holes are formed in the inner well pipe and the outer well pipe, a plurality of sliding grooves parallel to one another are formed in the inner wall of the outer well pipe, a plurality of sliding edges sliding in the corresponding sliding grooves are fixedly connected to the outer wall of the inner well pipe, and the space between the inner wall of the outer well pipe and the outer wall of the inner well pipe is filled with an elastic filtering piece. The filter pipe has the effect of conveniently cleaning the filter holes of the filter pipe.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pit dewatering construction, and in particular to a detachable pressure relief well. Background Art

[0002] A pressure relief well is a drainage facility installed on the backwater side of the levee and in the soil foundation downstream of the dam. Its working principle is to drill a well hole at the required depth outside the slope foot of the levee and dam downstream, then install a filter pipe in the well, and fill a gravel filter layer between the filter pipe and the well wall to prevent the water flow from carrying out fine sand and clogging the pipe wall. This reduces the seepage water pressure in the dam foundation, prevents soil seepage deformation, and enhances foundation stability.

[0003] After a long period of use, the filter holes on the filter tube will be clogged with fine sand, which will cause the tube wall to be blocked, making it impossible for groundwater to be discharged into the pressure relief well. The filter tube is stuck in the well by the gravel filter layer and is difficult to remove. It is very dangerous to go down the well to clean the filter tube. Utility Model Content

[0004] In order to facilitate cleaning of the filter holes of the filter tube, the present application provides a detachable pressure relief well.

[0005] The present application provides a detachable pressure relief well adopting the following technical solution:

[0006] A detachable pressure relief well comprises a pressure relief well, wherein an inner well pipe and an outer well pipe are arranged in the pressure relief well, the inner well pipe is slidably arranged in the inner wall of the outer well pipe, a plurality of filter holes are provided on the inner well pipe and the outer well pipe, a plurality of sliding grooves parallel to each other are provided on the inner wall of the outer well pipe, a plurality of sliding edges sliding in corresponding sliding grooves are fixedly connected to the outer wall of the inner well pipe, and an elastic filter is filled between the inner wall of the outer well pipe and the outer wall of the inner well pipe.

[0007] By adopting the above technical solution, an inner well pipe and an outer well pipe are arranged in the pressure relief well. On the one hand, the double filtration of the inner well pipe and the outer well pipe can enhance the filtering effect on groundwater, reduce the possibility of mud and sand being washed into the inner well pipe by groundwater, thereby preventing the soil in the soil layer from infiltrating and deforming, and enhancing the stability of the foundation. On the other hand, the inner well pipe is slidably arranged in the inner cavity of the outer well pipe. Since the elastic filter element is filled between the inner well pipe and the outer well pipe, it is convenient to remove the inner well pipe from the inner cavity of the outer well pipe, which is conducive to cleaning the inner well pipe, reducing the possibility that the filter holes on the inner well pipe are blocked, resulting in the difficulty of groundwater flowing into the inner cavity of the inner well pipe. At the same time, the sliding groove plays a limiting role on the inner well pipe, reducing the rotation of the inner well pipe, thereby reducing the mud and sand mixed in the elastic filter element due to the rotation of the inner well pipe. The elastic filter element can filter the groundwater. At the same time, the elastic filter element is clamped between the outer well pipe and the inner well pipe, which is also convenient for replacing the elastic filter element.

[0008] Optionally, one end of the inner well pipe extending out of the pressure relief well is provided with a fixed bracket for hoisting in cooperation with hoisting equipment.

[0009] By adopting the above technical solution, the provision of the fixed bracket can facilitate the lifting of the inner well pipe, thereby facilitating the installation and disassembly of the inner well pipe.

[0010] Optionally, the pressure relief well includes a water permeable section and a water impermeable section, and in the water permeable section, clay balls are filled between the outer wall of the outer well pipe and the inner wall of the pressure relief well.

[0011] By adopting the above technical solution, the clay balls have viscosity, thereby increasing the consolidation between the outer well pipe and the pressure relief well, making it difficult for the outer well pipe to be pulled out of the pressure relief well. At the same time, the clay balls can isolate the groundwater in the outer well pipe from overflowing from the pressure relief well into the surrounding soil layer.

[0012] Optionally, in the permeable section, a filter layer is filled between the outer wall of the outer well pipe and the inner wall of the pressure relief well.

[0013] By adopting the above technical solution, the filter layer is provided with a graded gravel layer from fine to coarse along the direction toward the outer well pipe. The filter layer is composed of 2-4 layers of sand, gravel or pebbles of different particle sizes. The particles gradually increase along the direction of the water flow, and the particles of any layer are not allowed to pass through the pores of the adjacent coarser layer. At the same time, the particles of the same layer cannot move relative to each other. When water passes through the filter layer, it will first screen the water, prevent larger particles such as suspended matter and silt from passing through, and retain them on the surface or inside, thereby achieving preliminary purification. Secondly, due to the existence of the filter layer, water has to go through a longer distance and fine-particle obstacles when passing through the filter layer, and the flow rate of the water is reduced, which plays an isolation role.

[0014] Optionally, a first nylon mesh is provided on the outer wall of the inner well pipe, and a second nylon mesh is provided on the outer wall of the outer well pipe, and the pore size of the first nylon mesh is smaller than the pore size of the second nylon mesh.

[0015] By adopting the above technical solution, when screening and filtering objects, the nylon net can accommodate large particles through larger mesh holes, while the nylon net with smaller pores can filter out smaller particles. Therefore, the second nylon net can perform preliminary filtering, while the first nylon net can further perform fine filtering, reducing the possibility of fine sediment entering the inner well pipe.

[0016] Optionally, an outer plastic net is sleeved and fixed on the outer well pipe.

[0017] By adopting the above technical solution, on the one hand, the outer plastic net can block the mud and sand, reducing the possibility of mud and sand blocking the filter holes on the outer well pipe; on the other hand, the outer plastic net can protect the outer well pipe during its transportation and installation, reducing the possibility of the outer well pipe being damaged due to collision.

[0018] Optionally, a plurality of the outer well pipes and the inner well pipes are provided, and the ends of a plurality of the outer well pipes are detachably connected, and the ends of a plurality of the inner well pipes are detachably connected.

[0019] By adopting the above technical solution, the inner well pipe and the outer well pipe are both composed of multiple sections, so that the lengths of the inner well pipe and the outer well pipe can be adjusted, thereby facilitating installation in pressure relief wells of different depths.

[0020] Optionally, a drainage ditch is excavated on one side of the pressure relief well, and a drainage pipe is connected to the side of the outer well pipe, and one end of the drainage pipe away from the pressure relief well is inserted into the drainage ditch.

[0021] By adopting the above technical solution, when the water level in the inner well pipe rises to the same height as the drainage pipe, the water in the inner well pipe penetrates into the outer well pipe and is discharged from the drainage pipe into the drainage ditch, thereby lowering the groundwater level.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. An inner well pipe and an outer well pipe are arranged in the pressure relief well. On the one hand, the filtering effect of groundwater can be enhanced, the possibility of mud and sand being washed into the inner well pipe by groundwater and discharged can be reduced, soil infiltration and deformation can be prevented, and foundation stability can be enhanced. On the other hand, the inner well pipe is slidingly arranged in the inner cavity of the outer well pipe. Since the space between the inner well pipe and the outer well pipe is filled with an elastic filter element, it is convenient to remove the inner well pipe from the inner cavity of the outer well pipe, which is beneficial to cleaning the inner well pipe and reducing the possibility of the filter holes on the inner well pipe being blocked, which makes it difficult for groundwater to flow into the inner cavity of the inner well pipe. At the same time, the sliding groove has a limiting effect on the inner well pipe, reducing the possibility of the inner well pipe rotating, thereby reducing the mud and sand mixed in the elastic filter element due to the rotation of the inner well pipe and being evenly smeared on the outer wall of the inner well pipe. The elastic filter element can filter the groundwater. At the same time, the elastic filter element is clamped between the outer well pipe and the inner well pipe, which is also convenient for replacing the elastic filter element.

[0024] 2. The filter layer is provided with a graded gravel layer from fine to coarse along the direction toward the outer well pipe. The filter layer is usually composed of 2-4 layers of sand, gravel or pebbles of different particle sizes. The particles gradually increase in size along the direction of the water flow, and the particles in any layer are not allowed to pass through the pores of the adjacent coarser layer. At the same time, the particles in the same layer cannot move relative to each other. When water passes through the filter layer, it will first screen the water, prevent larger particles such as suspended matter and silt from passing through, and retain them on the surface or inside, thereby achieving preliminary purification. Secondly, due to the existence of the filter layer, water has to go through a longer distance and fine-particle obstacles when passing through the filter layer, so the water flow rate is reduced, which plays an isolation role;

[0025] 3. When screening and filtering items, the nylon net can accommodate large particles through the larger mesh, while the nylon net with a smaller pore size can filter out smaller particles. Therefore, the second nylon net can perform preliminary filtration, while the first nylon net can further perform fine filtration, reducing the possibility of sediment entering the inner well pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic cross-sectional diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0028] Figure 3 It is a schematic diagram of the explosion structure of the inner well pipe and the outer well pipe in the embodiment of the present application.

[0029] Explanation of the reference numerals: 1. pressure relief well; 11. permeable section; 12. impermeable section; 13. clay ball; 14. filter layer; 15. drainage ditch; 2. inner well pipe; 21. sliding edge; 22. first nylon net; 23. elastic filter element; 24. fixed bracket; 3. outer well pipe; 31. sliding groove; 32. second nylon net; 33. outer plastic net; 34. drainage pipe; 35. cover plate; 4. filter hole. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-3 This application is described in further detail.

[0031] The present application discloses a detachable pressure relief well.

[0032] A removable relief well, referring to Figure 1 and Figure 2, including a pressure relief well 1 dug on the ground, the pressure relief well 1 includes an impermeable section 12 close to the wellhead and a permeable section 11 away from the wellhead, an outer well pipe 3 is inserted into the pressure relief well 1, an inner well pipe 2 is slidably arranged in the outer well pipe 3, and a plurality of filter holes 4 are opened on the pipe walls of the outer well pipe 3 and the inner well pipe 2.

[0033] Reference Figure 2 and Figure 3 A second nylon net 32 ​​is sleeved and fixedly connected on the outer wall of the outer well pipe 3, and the mesh of the second nylon net 32 ​​is smaller than the aperture of the filter hole 4. An outer plastic net 33 is also sleeved on the pipe body of the outer well pipe 3, and the outer plastic net 33 wraps the outer well pipe 3 and is wound around the outer well pipe 3 by tape. In the permeable section 11, an anti-filter layer 14 is filled between the outer wall of the outer well pipe 3 and the inner wall of the pressure relief well 1. The anti-filter layer 14 includes 2-4 layers of sand, gravel or pebbles with different particle sizes. The particles of the anti-filter layer 14 gradually increase in size toward the direction of the outer well pipe 3, and the particles of each layer cannot pass through the gaps between the particles of the next layer.

[0034] When groundwater passes through the filter layer 14, the filter layer 14 can prevent larger particles such as suspended matter and silt from passing through, and retain them on the surface or inside, thereby achieving preliminary purification. At the same time, due to the existence of the filter layer 14, water has to pass through a longer distance and obstacles with fine particles when passing through the filter layer 14, and the flow rate of water is reduced, thereby reducing the impact force on the silt, and then isolating the silt. The outer plastic net 33 can play a protective role on the outer well pipe 3. On the one hand, the outer plastic net 33 can block the silt and reduce the possibility of silt blocking the filter holes 4 on the outer well pipe 3; on the other hand, the outer plastic net 33 can protect the outer well rod during the transportation and installation of the outer well pipe 3, and reduce the occurrence of the outer well pipe 3 being damaged due to collision. The second nylon mesh 32 can further enhance the filtering effect on groundwater. At the same time, the second nylon mesh 32 has excellent corrosion resistance, acid and alkali resistance and water resistance, so it can effectively prevent the outer well pipe 3 from being corroded by groundwater, thereby extending the service life of the outer well pipe 3.

[0035] Reference Figure 1 and Figure 2 In the watertight section 12, clay balls 13 are filled between the outer wall of the outer well pipe 3 and the inner wall of the pressure relief well 1. The clay balls 13 can be used as an adhesive to fix the outer well pipe 3 on the inner wall of the pressure relief well 1, so that the outer well pipe 3 is not easily pulled out of the pressure relief well 1. At the same time, the clay balls 13 can prevent the groundwater in the outer well pipe 3 from overflowing from the pressure relief well 1 to the surrounding soil layer.

[0036] Reference Figure 2 and Figure 3The inner wall of the outer well pipe 3 is provided with a plurality of sliding grooves 31 parallel to each other, and the outer wall of the inner well pipe 2 is fixedly connected with a plurality of sliding edges 21 slidably arranged in the corresponding sliding grooves 31. There are gaps between the inner wall of the outer well pipe 3 and the outer wall of the inner well pipe 2, and the gaps are filled with elastic filter elements 23, which are foam plastic filter bodies, and the elastic filter elements 23 are wrapped on the inner well pipe 2. A first nylon net 22 is provided on the outer wall of the inner well pipe 2, and the aperture of the first nylon net 22 is smaller than the aperture of the second nylon net 32. When screening and filtering items, the nylon net can accommodate large particles through larger meshes, while the nylon net with smaller aperture can filter out smaller particles. Therefore, the second nylon net 32 ​​can perform preliminary filtering, and the first nylon net 22 can further perform fine filtering, reducing the possibility of mud and sand entering the inner well pipe 2.

[0037] Reference Figure 1 and Figure 3 , there are several outer well pipes 3 and inner well pipes 2, and several outer well pipes 3 are detachably connected together by flanges, so that the length of the outer well pipe 3 can be increased, and several inner well pipes 2 can also be detachably connected together by flanges. The end of the inner well pipe 2 extending out of the pressure relief well 1 is fixedly connected with a fixed bracket 24 for hoisting with the hoisting equipment, and the side wall of the outer well pipe 3 extending out of the pressure relief well 1 is connected with a drainage pipe 34, and a drainage ditch 15 is excavated on one side of the pressure relief well 1, and the end of the drainage pipe 34 away from the pressure relief well 1 is plugged into the drainage ditch 15. The end of the outer well pipe 3 extending out of the pressure relief well 1 is connected with a cover plate 35 that can open and close the pipe mouth of the outer well pipe 3, and the cover plate 35 closes the outer well pipe 3 to reduce the possibility of the water in the pressure relief well 1 flowing out of the pipe mouth of the outer well pipe 3.

[0038] The implementation principle of a detachable pressure relief well in an embodiment of the present application is as follows: when the filter hole 4 on the inner well pipe 2 is blocked, the cover plate 35 is opened, the fixed bracket 24 is fixed with a lifting equipment, the inner well pipe 2 is lifted out from the tube cavity of the outer well pipe 3, the elastic filter element 23 is removed from the inner well pipe 2 and cleaned, and the inner well pipe 2 is cleaned at the same time to remove the mud and sand in the filter hole 4, and then the elastic filter element 23 is installed on the inner well pipe 2, and the mud and sand in the inner cavity of the outer well pipe 3 are extracted, and the cleaned inner well pipe 2 is installed in the outer well pipe 3, and finally the cover plate 35 is closed.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A detachable pressure relief well, characterized in that: The invention comprises a pressure relief well (1), wherein an inner well pipe (2) and an outer well pipe (3) are arranged in the pressure relief well (1), the inner well pipe (2) is slidably arranged in the inner wall of the outer well pipe (3), a plurality of filter holes (4) are provided on both the inner well pipe (2) and the outer well pipe (3), a plurality of mutually parallel sliding grooves (31) are provided on the inner wall of the outer well pipe (3), a plurality of sliding edges (21) sliding in corresponding sliding grooves (31) are fixedly connected to the outer wall of the inner well pipe (2), and an elastic filter element (23) is filled between the inner wall of the outer well pipe (3) and the outer wall of the inner well pipe (2).

2. A detachable pressure relief well according to claim 1, characterized in that: One end of the inner well pipe (2) extending out of the pressure relief well (1) is provided with a fixed bracket (24) for hoisting in cooperation with hoisting equipment.

3. A detachable pressure relief well according to claim 1, characterized in that: The pressure relief well (1) comprises a water-permeable section (11) and a water-impermeable section (12). In the water-impermeable section (12), clay balls (13) are filled between the outer wall of the outer well pipe (3) and the inner wall of the pressure relief well (1).

4. A detachable pressure relief well according to claim 3, characterized in that: In the water permeable section (11) region, a filter layer (14) is filled between the outer wall of the outer well pipe (3) and the inner wall of the pressure relief well (1).

5. A detachable pressure relief well according to claim 3, characterized in that: A first nylon mesh (22) is arranged on the outer wall of the inner well tube (2), and a second nylon mesh (32) is arranged on the outer wall of the outer well tube (3); the aperture of the first nylon mesh (22) is smaller than the aperture of the second nylon mesh (32).

6. A detachable pressure relief well according to claim 1, characterized in that: An outer plastic net (33) is sleeved and fixed on the outer well pipe (3).

7. A detachable pressure relief well according to claim 1, characterized in that: A plurality of the outer well pipes (3) and the inner well pipes (2) are provided, and the ends of the plurality of the outer well pipes (3) are detachably connected, and the ends of the plurality of the inner well pipes (2) are detachably connected.

8. A detachable pressure relief well according to claim 7, characterized in that A drainage ditch (15) is excavated on one side of the pressure relief well (1), and a drainage pipe (34) is connected to the side of the outer well pipe (3), and an end of the drainage pipe (34) away from the pressure relief well (1) is inserted into the drainage ditch (15).

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