Protective plugging structure for large-surge precipitation well

Abstract

The utility model relates to a large surge precipitation well protection plugging structure which comprises a sleeve and a tube well which are connected on a construction bottom surface and extend upwards and downwards respectively, an isolation layer is arranged in the tube well, and the isolation layer divides the tube well into an upper plugging layer and a lower permeable layer; the water-permeable layer is provided with a water pump and a downcast pipe connected with the water pump; the downcast pipe upwards extends out of an upper opening of the sleeve; an inner buckling cover plate is arranged in the sleeve, a grouting pipe penetrates through the inner buckling cover plate, and the grouting pipe upwards extends out of an upper opening of the sleeve and downwards extends to the bottom of the plugging layer. The protection and plugging structure is well arranged, the control effect on large-surge groundwater can be remarkably improved, and water burst is prevented.

Description

Technical Field

[0001] This application relates to the field of construction site dewatering technology, specifically to a protective sealing structure for a high-volume dewatering well. Background Technology

[0002] During municipal road construction, open-cut deep foundation pit construction requires lowering the groundwater level to below 0.5m below the construction surface. For engineering manholes with high water levels and large inflow volumes, continuous dewatering is necessary to prevent excessively high groundwater levels from affecting construction.

[0003] After the dewatering facilities are installed, the wells need to be sealed and protected. In the existing technology, the sealing and protection structure for wells with large flow rates has the following problems: (1) The sealing structure is not reliable enough, resulting in insufficient groundwater level control. (2) After the groundwater flows out, the sealing material is lost with the groundwater. Utility Model Content

[0004] This application provides a protective sealing structure for high-volume rainwater wells, which can improve the reliability of engineering well sealing structures and prevent groundwater outflow.

[0005] The technical solution of this application is as follows:

[0006] A protective sealing structure for a high-volume dewatering well includes a sleeve and a manhole that are connected at the construction bottom and extend upward and downward respectively. The manhole has an isolation layer that divides the manhole into an upper sealing layer and a lower permeable layer. The permeable layer has a water pump and a dewatering pipe connected to the water pump. The dewatering pipe extends upward out of the upper opening of the sleeve. The sleeve has an inner cover plate inside, through which a grouting pipe extends upward out of the upper opening of the sleeve and downward to the bottom of the sealing layer.

[0007] Furthermore, the isolation layer is made of geotextile wrapped with graded crushed stone.

[0008] Furthermore, the permeable layer is filled with crushed stone with a size of 25mm.

[0009] Furthermore, the water pump is externally wrapped with wire mesh.

[0010] Furthermore, the isolation layer is disposed 0.5m below the construction bottom surface.

[0011] Furthermore, a ball valve switch is installed 0.5m above the construction bottom surface.

[0012] Furthermore, the number of grouting pipes is two, and they are symmetrically arranged on both sides of the dewatering pipe.

[0013] Furthermore, the sealing layer is filled with a mixed solution of cement grout and water glass solution through the grouting pipe.

[0014] Furthermore, the upper opening of the sleeve is provided with a flange cover plate, and the flange cover plate is equipped with a sealing rubber ring.

[0015] Furthermore, the flange cover and the inner buckle cover are filled with micro-expansion concrete.

[0016] Due to the adoption of the above technical solution, the beneficial effects of this application are as follows:

[0017] 1. The protective sealing structure provided in this application has distinct layers. The bottom layer is a permeable layer, through which a buried water pump enables continuous water drainage. Above the permeable layer is the sealing layer, through which sealing material is injected via grouting pipes. The sealing layer forms a reliable sealing structure, which, together with the isolation layer, can significantly improve the control effectiveness against large inflows of groundwater.

[0018] 2. This application strengthens the waterproof well by connecting the sleeve and the well pipe. The flange cover and inner cover plate installed in the sleeve not only prevent the consequences of water inrush but also provide a stable connection for the dewatering pipe and the grouting pipe. Attached Figure Description

[0019] The accompanying drawings, which are provided to further understand this application and constitute a part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0020] Figure 1 A schematic diagram of a protective sealing structure for a high-volume precipitation well provided in this application;

[0021] In the attached diagram:

[0022] 1. Construction bottom surface; 2. Sleeve; 3. Well; 4. Isolation layer; 5. Sealing layer; 6. Permeable layer; 7. Water pump; 8. Dewatering pipe; 9. Inner cover plate; 10. Sealing ring; 11. Ball valve switch; 12. Grouting pipe; 13. Flange cover plate. Detailed Implementation

[0023] Based on the background technology, this application provides a protective sealing structure for a high-volume dewatering well, including a sleeve 2 and a well 3 that are connected at the construction bottom surface 1 and extend upward and downward respectively. The well 3 is provided with an isolation layer 4, which divides the well 3 into an upper sealing layer 5 and a lower permeable layer 6. The permeable layer 6 is provided with a water pump 7 and a dewatering pipe 8 connected to the water pump 7. The dewatering pipe 8 extends upward out of the upper opening of the sleeve 2. The sleeve 2 is provided with an inner buckle cover plate 9, through which a grouting pipe 12 extends upward out of the upper opening of the sleeve 2 and downward to the bottom of the sealing layer 5.

[0024] In this application, the construction bottom surface 1 has a certain thickness and is the lowest point of the project construction. The main body of the project is constructed after the construction bottom surface 1 is completed. Therefore, the connection between the sleeve 2 and the well 3 at the construction bottom surface 1 described in this application refers to an interlocking connection. See Appendix Figure 1 In this application, the sleeve 2 is fitted around the outer periphery of the well 3 to complete the connection. Furthermore, when calculating the distance with respect to the construction bottom surface 1, the center surface of the construction bottom surface 1 is used as the reference surface. By way of example and not limitation, the sleeve 2 in this application is made of steel and has high strength. By way of example and not limitation, the well casing in this application is made of sand-free casing.

[0025] The working principle of this application is as follows: After the dewatering well is constructed, a sleeve 2 is installed on top. After the sleeve 2 is installed, a temporary cover plate is placed over it to prevent building materials or garbage from falling into the dewatering well. Crushed stone is filled into the permeable layer 6, surrounding the water pump 7. The filling height is 2m. The crushed stone has a filtering effect, crushing large-diameter mud lumps and preventing them from being sucked into the water pump 7 and causing blockage. Above the permeable layer 6 is an isolation layer 4, which prevents the grout from seeping down, thereby improving the grouting quality and preventing the grout from solidifying and clogging the dewatering well. During the sealing process, the water pump 7 operates continuously, continuously injecting grout into the sealing layer 5 through the grouting pipe 12. During grouting, the grouting pressure is controlled to avoid affecting the surrounding water system. During grouting, graded crushed stone is continuously filled into the sealing layer 5, working in conjunction with the grouting pipe 12 to achieve sealing of the sealing layer 5. After grouting is completed, stop dewatering and observe whether there is water seepage on the top surface of the sealing layer 5. If there is no water seepage, pour micro-expansion concrete up to 20cm below the top of the sleeve 2. If there is water seepage, grout again through the grouting pipe 12 and then pour micro-expansion concrete. After the first pour of micro-expansion concrete reaches its strength, observe for 24 hours. If no water seepage occurs, weld the inner cover plate 9 on the top surface of the first pour of micro-expansion concrete, and then pour micro-expansion concrete again on top of the inner cover plate 9.

[0026] It should be noted that the grade of the micro-expansion concrete mentioned above can be the same as that of the main construction material to facilitate construction.

[0027] In a preferred embodiment of this application, the isolation layer 4 is made of geotextile wrapped with graded crushed stone. The graded crushed stone, as described in a specific embodiment of the above-described method, is filled in the permeable layer 6 with crushed stone having a particle size of 25mm. Filling the permeable layer with crushed stone prevents the water pump 7 from sucking in large mud particles, thus avoiding blockage and maintaining the normal function of the water pump 7.

[0028] In a preferred embodiment of the above embodiments, the water pump 7 is externally wrapped with a wire mesh. The wire mesh can further improve the filtration performance and prevent impurities from entering the water pump 7 and causing blockage.

[0029] In another specific embodiment of the above implementation method, the isolation layer 4 is disposed 0.5m below the construction bottom surface 1. The isolation layer 4 divides the well 3 into a permeable layer 6 and a sealing layer 5, and generally requires the water level to be 0.5m below the construction bottom surface 1.

[0030] In a preferred embodiment of this application, a ball valve switch 11 is provided 0.5m above the construction bottom surface 1. The ball valve switch 11 can control the opening and closing of the downwater pipe 8 and control its operation.

[0031] In a preferred embodiment of this application, the number of grouting pipes 12 is two, symmetrically arranged on both sides of the dewatering pipe 8. The two grouting pipes 12 are used to achieve single-pipe grouting, and the other grouting pipe 12 is activated after the first sealing to supplement the sealing effect.

[0032] In a preferred embodiment of this application, the sealing layer 5 is filled with a mixed solution of cement slurry and water glass solution through the grouting pipe 12.

[0033] This application employs a single-pipe, two-component grouting method. The grouting material is a mixture of cement grout and water glass solution in a volume ratio of 3:1. The grouting pipe 12 should penetrate the cover it passes through. Figure 1 The diagram shows the completed construction. At this point, the portion of the grouting pipe 12 above the inner cover plate 9 is cut off after grouting is completed. Single-pipe double-liquid grouting means that one grouting pipe 12 is used for grouting, and if water seepage is found after grouting is completed, another grouting pipe 12 is used for grouting.

[0034] In a preferred embodiment of this application, the upper opening of the sleeve 2 is provided with a flange cover plate 13, and the flange cover plate 13 is equipped with a sealing ring 10. The sealing ring 10 can be made of expanding adhesive, and the flange cover plate 13 is fastened to the sleeve 2 by bolts. After installation, concrete is used to encapsulate the flange cover plate 13, making it tightly bonded to the foundation and ensuring the integrity of the structure.

[0035] In one specific embodiment of the above implementation method, the flange cover plate 13 and the inner buckle cover plate 9 are filled with micro-expansion concrete. This micro-expansion concrete is the second pour of concrete described in the working principle.

[0036] The protective sealing structure provided in this application has distinct layers. The bottom layer is a permeable layer 6, which is continuously pumped down by a buried water pump 7. Above the permeable layer 6 is a sealing layer 5, which is filled with sealing material through a grouting pipe 12. The sealing layer 5 forms a reliable sealing structure, which, together with the isolation layer 4, can significantly improve the control effectiveness against large inflows of groundwater.

[0037] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0038] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A large-yield dewatering well protection plugging structure, comprising a sleeve and a pipe well connected at a construction bottom surface and extending upward and downward respectively, characterized in that, an isolation layer is arranged in the pipe well, and the isolation layer separates the pipe well into an upper plugging layer and a lower water-permeable layer; the water-permeable layer is provided with a water pump and a dewatering pipe connected to the water pump, and the dewatering pipe extends upward out of the upper opening of the sleeve; an inner buckle cover plate is arranged inside the sleeve, and a grouting pipe is arranged through the inner buckle cover plate, the grouting pipe extending upward out of the upper opening of the sleeve and downward to the bottom of the plugging layer.

2. The large-yield dewatering well protection plugging structure according to claim 1, characterized in that, the isolation layer is made of wrapped graded gravel.

3. The large-yield dewatering well protection plugging structure according to claim 2, characterized in that, the water-permeable layer is filled with gravel with a specification of 25 mm.

4. The large-yield dewatering well protection plugging structure according to claim 3, characterized in that, the water pump is wrapped with a steel mesh outside.

5. The large-yield dewatering well protection plugging structure according to claim 2, characterized in that, the isolation layer is arranged at a position 0.5 m downward from the construction bottom surface.

6. The large-yield dewatering well protection plugging structure according to claim 1, characterized in that, a ball valve switch is arranged at a position 0.5 m upward from the construction bottom surface.

7. The large-yield dewatering well protection plugging structure according to claim 1, characterized in that, the number of the grouting pipes is two, and the grouting pipes are symmetrically arranged on both sides of the dewatering pipe.

8. The large-yield dewatering well protection plugging structure according to claim 1, characterized in that, the plugging layer is filled with a mixed solution composed of cement slurry and water glass solution through the grouting pipes.

9. The large-yield dewatering well protection plugging structure according to claim 1, characterized in that, a flange cover plate is arranged at the upper opening of the sleeve, and the flange cover plate is provided with a sealing rubber ring.

10. The large-yield dewatering well protection plugging structure according to claim 9, characterized in that, the flange cover plate and the inner buckle cover plate are filled with micro-expanding concrete.

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