High-strength diaphragm wall for dewatering well

Abstract

The utility model relates to the technical field of dewatering wells, in particular to a high-strength anti-seepage wall for a dewatering well, which comprises a ground, a dewatering well main body is arranged in the ground, the inner wall of the dewatering well main body is connected with a well pipe body, the outside of the well pipe body is filled with an anti-seepage wall layer, a gravel layer is arranged below the anti-seepage wall layer, and the gravel layer is arranged below the gravel layer. The dewatering well comprises a dewatering well body, a gravel layer is arranged on the top of the dewatering well body, a clay layer is filled at the top of the gravel layer, and the exterior of the gravel layer and the exterior of the dewatering well body are connected with a bundling filter screen sleeve. And the tightening filter screen sleeve is additionally arranged, so that the tightening and maintaining effects can be achieved, and the high-strength protection and anti-seepage maintaining effects of the anti-seepage wall in the dewatering well are guaranteed.

Description

Technical Field

[0001] The utility model relates to a high-strength anti-seepage wall for a precipitation well, belonging to the technical field of precipitation wells. Background Art

[0002] According to the stratigraphic data and hydrogeological conditions of the work area, combined with the drainage system around the reservoir area, the groundwater in the reservoir area is mainly replenished by atmospheric precipitation infiltration. The groundwater type is mainly bedrock fissure water. In order to prevent harmful ions in the tailings in the reservoir area from contaminating the groundwater, it is planned to use precipitation in the reservoir area to reduce the infiltration of harmful ions in the tailings pond. According to the direction of groundwater runoff, groundwater mainly accumulates in the downstream of the reservoir area. Therefore, precipitation wells are mainly arranged in the downstream of the reservoir area.

[0003] Since the above-mentioned precipitation well is formed into a retaining wall by discharging materials after positioning the pipe well, if there is mixing of materials during the discharge process, it will affect the anti-seepage protection effect of the precipitation well, which will bring certain adverse effects to actual use, so it needs to be improved. Utility Model Content

[0004] The purpose of the present invention is to provide a high-strength anti-seepage wall for a precipitation well. The present invention pre-plans the preparation and sorting of the casting materials, and orderly prevents mixing and divides them into multiple gravel layers and clay layers for enclosure, and adds a convergence filter sleeve to have a tightening and maintaining effect, thereby ensuring the high-strength protection and anti-seepage effect of the anti-seepage wall in the precipitation well, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A high-strength anti-seepage wall for a precipitation well comprises a ground surface, a precipitation well body is provided inside the ground surface, a well pipe body is connected to the inner wall of the precipitation well body, an anti-seepage wall layer is filled on the outside of the well pipe body, a gravel layer is provided below the anti-seepage wall layer, a clay layer is filled on the top of the gravel layer, and a convergent filter mesh sleeve is connected to the outside of the gravel layer and the outside of the precipitation well body.

[0007] Furthermore, the well pipe body is a sandless cement filter pipe, and the shape of the entire sandless cement filter pipe is a hollow cylindrical tube.

[0008] Furthermore, a drilling groove is opened in the interior of the precipitation well body, and gravel filter material is filled between the drilling groove and the well pipe body.

[0009] Furthermore, the clay layer consists of a silty clay layer and an upper clay layer, and the upper clay layer is located directly above the silty clay layer.

[0010] Furthermore, the gravel layer is composed of a moderately weathered mixed rock layer, a strongly weathered mixed rock layer, and a breccia layer, and the moderately weathered mixed rock layer is located at the bottom, the moderately weathered mixed rock layer is connected to the strongly weathered mixed rock layer above, and the strongly weathered mixed rock layer is connected to the breccia layer above.

[0011] Furthermore, an extension pipe is fixedly connected to the top of the precipitation well body, the extension pipe is located above the ground, and the overall length of the extension pipe is at least 0.5m.

[0012] Furthermore, the well pipe body is composed of a water filter pipe and a solid pipe, and the bottom of the inner wall of the well pipe body located at the bottom is connected to a sealing base.

[0013] The beneficial effects of the utility model are:

[0014] 1. In the present invention, the well pipe body in the main body of the precipitation well is provided with a sandless cement filter pipe. Before the well pipe body is lowered, the length of the filter pipe and the solid pipe should be configured in advance according to the design requirements, and each section of the well pipe body should be numbered. When the well pipe body is lowered, it is hoisted and connected section by section according to the number. All well pipe bodies are required to be straight and the length meets the design requirements. The bottom of the inner wall of the bottom section of the well pipe body is sealed with a sealed base concrete. An extension pipe is provided at the top of the well pipe body, and the upper end of the extension pipe is at least 50 cm above the ground. It is strictly forbidden to force the well pipe body into the wellbore. The well pipe body can be installed accordingly according to the depth of the precipitation well body.

[0015] 2. In the present invention, gravel filter material of appropriate specifications is filled into the gap between the drilled slot and the well pipe body, and the well pipe body must be centered when filling the anti-seepage wall material. The circulating water filling method is used for backfilling, and the filter material is evenly scattered around the well pipe with a shovel or a discharger. When the actual backfill volume is close to 80% of the theoretical volume, a measuring rope is promptly lowered to measure and correct the filter material backfill height, and the backfill is gradually filled to the designed depth. After the well is washed and compacted, gravel material is supplemented and clay is filled in to seal it. Since the anti-seepage wall layer is composed of a medium-weathered mixed rock layer, a strongly weathered mixed rock layer, a breccia layer, a silty clay layer and an upper clay layer from bottom to top, a compacted and firm anti-seepage wall layer can be formed to protect the anti-seepage area, and a convergent filter mesh sleeve is provided on the outside of the anti-seepage wall layer to play a restraining and tightening effect, thereby ensuring the high-strength protection of the anti-seepage wall in the precipitation well and maintaining the anti-seepage effect.

[0016] 3. In the present invention, when preparing the mixing material, multiple rows of grouting holes are set in the high-pressure rotary spraying curtain, which can be arranged in a plum blossom shape. The bottom of the grouting holes is determined according to the drilling formation data and adjusted according to the actual drilling formation conditions; the slurry diffusion radius;

[0017] (1) Material requirements: Cement: Ordinary Portland cement. This project uses P.042.5 Portland cement. Cement must meet quality standards and must not be damp and agglomerated cement. Water: Tap water. If the injection volume during the grouting stage is large and the grouting is difficult to complete, water glass, an accelerating setting agent, can be added to the slurry. The amount of water glass added is determined based on on-site tests.

[0018] (2) Slurry ratio and slurry change standard - the grouting slurry is changed from thin to thick step by step. The slurry water-cement ratio can be 3:1, 2:1, 1:1, and 0.8:1. When the grouting pressure remains unchanged and the injection rate continues to decrease, or when the injection rate remains unchanged and the grouting pressure continues to increase, the water-cement ratio shall not be changed. When the injection volume of a certain concentration slurry reaches 5m3 to 10m3 or more, or the grouting time has reached 30 minutes, and there is no significant change in the grouting pressure and injection rate, the grouting should be changed to a different water-cement ratio.

[0019] (3) Grouting pressure: To ensure the injection rate of slurry and water blocking effect, the design pressure of pure pressure grouting is 1.0~2.5MPa;

[0020] (4) The grouting process adopts segmented grouting from bottom to top throughout the hole. Grouting generally adopts the principle of first thin slurry, then thick slurry, and gradually increasing the concentration to change the slurry concentration. A simple water pressure test should be carried out before grouting to judge the permeability of the formation and determine the initial water-cement ratio of grouting. For cement curtain grouting, the grouting volume of the grouting section is 20-35L / min and the grouting pressure reaches the final pressure and is maintained for 20-30min. After the grouting section is under the maximum design pressure and the injection rate is not greater than 1L / min, grouting is continued for 60min to end the grouting. The drilling curtain grouting should first be tested on site to determine the process parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the specific embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0022] Figure 1 This is a schematic diagram of the overall structure of a high-strength anti-seepage wall for a precipitation well in the utility model;

[0023] Figure 2 This is a front cross-sectional view of a high-strength anti-seepage wall for a precipitation well of the utility model;

[0024] Figure 3 This is a cross-sectional view of the anti-seepage wall layer in a high-strength anti-seepage wall for a precipitation well of the utility model;

[0025] Figure 4 This is an enlarged view of point A of a high-strength anti-seepage wall for a precipitation well in the utility model;

[0026] Figure 5 This is a grouting process flow chart for a high-strength anti-seepage wall for a precipitation well in the utility model;

[0027] Figure 6 This is a construction process flow chart of a precipitation pipe well with a high-strength anti-seepage wall for a precipitation well in the utility model;

[0028] Numbers in the figure: 1. Ground; 2. Main body of the precipitation well; 3. Well pipe body; 4. Anti-seepage wall layer; 5. Gravel layer; 6. Clay layer; 7. Converging filter sleeve; 8. Drilling slot; 9. Silty clay layer; 10. Upper clay layer; 11. Moderately weathered mixed rock layer; 12. Strongly weathered mixed rock layer; 13. Breccia layer; 14. Extension pipe; 15. Sealing base. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1, please refer to Figures 1-6 , the utility model provides a technical solution:

[0031] A high-strength anti-seepage wall for a precipitation well includes a ground 1, a precipitation well body 2 is opened inside the ground 1, the inner wall of the precipitation well body 2 is connected to a well pipe body 3, the outside of the well pipe body 3 is filled with an anti-seepage wall layer 4, below the anti-seepage wall layer 4 is a gravel layer 5, the top of the gravel layer 5 is filled with a clay layer 6, and the outside of the gravel layer 5 and the outside of the precipitation well body 2 are connected to a convergent filter sleeve 7.

[0032] Specifically, such as Figures 1-6 As shown, the well pipe body 3 is a sandless cement filter tube, and the entire sandless cement filter tube is shaped like a hollow cylinder. Using the sandless cement filter tube in the drainage well body 2 can achieve a strong water retention effect. Drilled slots 8 are provided within the drainage well body 2. Gravel filter material is filled between the drilled slots 8 and the well pipe body 3. The drilled slots 8 are pre-prepared for containment, that is, the gap between the well pipe body 3 and the drilled slots 8 is filled with gravel filter material of appropriate specifications.

[0033] Specifically, such as Figures 1-6 As shown, an extension pipe 14 is fixedly connected to the top of the precipitation well body 2. The extension pipe 14 is located above the ground 1, and the overall length of the extension pipe 14 is at least 0.5m, which can maintain the water level from above and prevent overflow.

[0034] Furthermore, the well pipe body 3 is composed of a water filter pipe and a solid pipe, and the bottom of the inner wall of the well pipe body 3 at the bottom is connected to a sealing base 15. Before the well pipe body 3 is lowered, the lengths of the water filter pipe and the solid pipe should be configured in advance according to the design requirements, and each section of the well pipe body 3 should be numbered. When the well pipe body 3 is lowered, it is hoisted and connected section by section according to the number.

[0035] Example 2, please refer to Figures 1-6 The difference between this embodiment and embodiment 1 is that the clay layer 6 is composed of a silty clay layer 9 and an upper clay layer 10, and the upper clay layer 10 is located directly above the silty clay layer 9. The gravel layer 5 is composed of a moderately weathered mixed rock layer 11, a strongly weathered mixed rock layer 12, and a breccia layer 13, with the moderately weathered mixed rock layer 11 located at the bottom. The moderately weathered mixed rock layer 11 is connected to the strongly weathered mixed rock layer 12 above, and the strongly weathered mixed rock layer 12 is connected to the breccia layer 13 above. The anti-seepage wall layer 4 is composed of the moderately weathered mixed rock layer 11, the strongly weathered mixed rock layer 12, the breccia layer 13, the silty clay layer 9, and the upper clay layer 10 from bottom to top, forming a compacted and firmly tamped anti-seepage wall layer 4 for anti-seepage protection.

[0036] The working principle of the utility model: when in use, during the operation of well construction, a 150 impact-type water well drilling rig can be used to drill a hole, the machine's built-in winch can be used to lower the well pipe, a deep well submersible pump can be used to pump water, and a water level gauge can be placed to enable the water pump to have an automatic start and stop function. The basic shape of a precipitation well is pre-cleaned and formed. The well pipe body 3 in the precipitation well main body 2 of this structural device adopts a sandless cement filter pipe, which can be lowered and placed using the machine's built-in winch. Before the well pipe body 3 is lowered, the length of the filter pipe and the real pipe should be configured in advance according to the design requirements, and the well pipe body 3 should be numbered section by section. When the well pipe body 3 is lowered, it is hoisted and connected section by section according to the number. All well pipe bodies 3 are required to be straight and the length meets the design requirements. The bottom of the inner wall of the lowest section of the well pipe body 3 is sealed with a sealing base 15 concrete base. An extension pipe 14 is provided at the top of the well pipe body 3, and the upper end of the extension pipe 14 is at least 50 cm above the ground 1. It is strictly forbidden to force the well pipe body 3 into the wellbore. Then, the wellbore is enclosed according to the pre-drilled groove 8. That is, gravel filter material of appropriate specifications (such as 1-3 mm gravel filter material) is filled in the gap between the wellbore 3 and the drilled hole. When filling the anti-seepage wall layer 4, the wellbore 3 must be centered. The circulating water filling method is used for backfilling. The filter material is evenly spread around the wellbore with a shovel or a discharger. When the actual backfill volume is close to 80% of the theoretical volume, the measuring rope is promptly lowered to measure and calibrate the filter material backfill height. And gradually fill to the designed depth, after washing and compacting the well, fill with gravel and fill with clay to seal it. Since the anti-seepage wall layer 4 is composed of a medium-weathered mixed rock layer 11, a strongly weathered mixed rock layer 12, a breccia layer 13, a silty clay layer 9 and an upper clay layer 10 from bottom to top, a compacted and firmly rammed anti-seepage wall layer 4 can be formed to protect the anti-seepage area, and a convergent filter mesh sleeve 7 is provided on the outside of the anti-seepage wall layer 4 to have a restraining and tightening effect, thereby ensuring the high-strength protection of the anti-seepage wall in the precipitation well and maintaining the anti-seepage effect.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength anti-seepage wall for a precipitation well, comprising a ground (1), wherein a precipitation well body (2) is provided inside the ground (1), and characterized in that: The inner wall of the precipitation well main body (2) is connected to a well pipe body (3), the outside of the well pipe body (3) is filled with an anti-seepage wall layer (4), below the anti-seepage wall layer (4) is a crushed stone layer (5), the top of the crushed stone layer (5) is filled with a clay layer (6), and the outside of the crushed stone layer (5) and the outside of the precipitation well main body (2) are connected to a convergent filter screen sleeve (7).

2. The high-strength anti-seepage wall for a precipitation well according to claim 1, characterized in that: The well pipe body (3) is a sandless cement filter pipe, and the shape of the entire sandless cement filter pipe is a hollow cylindrical tube.

3. The high-strength anti-seepage wall for a precipitation well according to claim 1, characterized in that: A drilling groove (8) is provided in the interior of the dewatering well body (2), and gravel filter material is filled between the drilling groove (8) and the well pipe body (3).

4. The high-strength anti-seepage wall for a precipitation well according to claim 1, characterized in that: The clay layer (6) consists of a silty clay layer (9) and an upper clay layer (10), and the upper clay layer (10) is located directly above the silty clay layer (9).

5. The high-strength anti-seepage wall for a precipitation well according to claim 1, characterized in that: The gravel layer (5) is composed of a moderately weathered mixed rock layer (11), a strongly weathered mixed rock layer (12), and a breccia layer (13), wherein the moderately weathered mixed rock layer (11) is located at the bottom, the moderately weathered mixed rock layer (11) is connected to the strongly weathered mixed rock layer (12) above, and the strongly weathered mixed rock layer (12) is connected to the breccia layer (13) above.

6. The high-strength anti-seepage wall for a precipitation well according to claim 1, characterized in that: An extension pipe (14) is fixedly connected to the top of the precipitation well body (2), the extension pipe (14) is located above the ground (1), and the entire length of the extension pipe (14) is at least 0.5 m.

7. The high-strength anti-seepage wall for a precipitation well according to claim 1, characterized in that: The well pipe body (3) is composed of a water filter pipe and a solid pipe, and the bottom of the inner wall of the well pipe body (3) located at the bottom is connected to a sealing base (15).

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