A structure for sealing seepage paths around a precipitation well

Abstract

This application discloses a sealing structure for seepage paths around a dewatering well, relating to the field of waterproofing technology for construction sites. The structure includes a concrete base slab and a well casing embedded therein. The well casing is cut off from the lower end of the concrete base slab upwards to form a replacement section, which is fixedly connected to the upper opening of the cut-off well casing. The lower end of the replacement section is provided with a lower annular water-stopping wing ring with a water-swellable rubber strip, and the upper end is provided with an upper annular water-stopping wing ring. The upper surface of the upper annular water-stopping wing ring is provided with a cover plate with grouting holes and vent holes. This application, through the cooperation of the replacement section and the upper and lower annular water-stopping wing rings, combined with the water-swellable rubber strip and grouting system, effectively isolates groundwater seepage paths, improves the stability and seepage prevention performance of the well sealing, and protects the waterproofing quality of the main structure.

Description

Technical Field

[0001] This application relates to the field of waterproofing technology for construction sites, specifically to a structure for sealing the seepage path around a dewatering well. Background Technology

[0002] The sealing of dewatering wells in underground passages with high water levels can significantly affect the waterproofing quality of the main structure later on. Traditional dewatering well sealing methods have problems such as poor isolation of groundwater paths around the dewatering wells, slow solidification of grouting materials, or incomplete filling. This can lead to an imbalance in groundwater pressure, which may cause the main structure of the underground passage (such as the foundation slab) to float upwards, damage the waterproofing layer, and affect the waterproofing performance. Summary of the Invention

[0003] This application provides a sealing structure for seepage paths around dewatering wells, which solves the problem of insufficient sealing effect in key parts of dewatering pipes.

[0004] The technical solution of this application is as follows:

[0005] A seepage path sealing structure around a dewatering well includes a concrete base slab and a well cylinder embedded in the concrete base slab. The well cylinder is cut off from the lower end of the concrete base slab to form a replacement section, and the replacement section is fixedly connected to the upper opening of the cut-off well cylinder. The lower end of the replacement section is provided with a lower annular water-stop wing ring, and the outer edge of the lower annular water-stop wing ring is provided with a water-swellable rubber strip. The upper end of the replacement section is provided with an upper annular water-stop wing ring, and the upper surface of the upper water-stop wing ring is provided with a cover plate covering the upper opening of the replacement section. The cover plate has a grouting hole and a vent hole at the corresponding position of the upper opening of the replacement section.

[0006] Furthermore, the wellbore is filled with cohesive soil, and the wellhead is sealed at the top with a steel plate.

[0007] Furthermore, the replacement part is welded to the steel plate.

[0008] Furthermore, the upper annular water-stop wing ring has a plurality of first bolt holes arranged in a circumferential annular array, and the cover plate is provided with second bolt holes aligned with the first bolt holes, and fastening bolts are provided in the first bolt holes and the second bolt holes.

[0009] Furthermore, a sealing ring is provided between the upper annular water-stop wing ring and the cover plate.

[0010] Furthermore, the replacement part is equipped with a grouting system on its outer periphery. The grouting system includes a grouting pipe connected to the grouting hole and a first grouting pump connected to the grouting pipe. The first grouting pump is equipped with a cement slurry tank.

[0011] Furthermore, the grouting system also includes a water glass pipe connected to the grouting pipe and a second grouting pump connected to the water glass pipe, the second grouting pump being equipped with a water glass agent tank.

[0012] Due to the adoption of the above technical solution, the beneficial effects of this application are as follows:

[0013] 1. This application replaces and strengthens the key parts of the well shaft by setting an upper annular water-stop wing ring and a lower annular water-stop wing ring on the upper and lower bottom surfaces of the concrete base slab, respectively, to effectively prevent and isolate the seepage path of groundwater, thereby improving the seepage prevention performance around the dewatering well and protecting the main structure.

[0014] 2. This application includes a rainwater-swellable rubber strip at the lower annular water-stop wing ring. When groundwater intrudes into the perimeter of the well shaft, the rubber strip expands rapidly upon contact with water, sealing the lower end of the replacement section. During the concrete slab pouring process, it is difficult to seal the gap between the concrete slab and the well shaft using pouring techniques alone; gaps will always form. Therefore, designing comprehensive preventative measures is essential.

[0015] 3. This application incorporates a grouting system in the replacement section to improve well sealing stability through the injection of cement grout and water glass agent. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate this application and form 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.

[0017] Figure 1 This application provides a schematic diagram of a seepage path sealing structure around a dewatering well.

[0018] Figure 2 This is a schematic diagram of the structure of the upper annular water-stop wing ring and the lower annular water-stop wing ring described in this application;

[0019] Figure 3 This is a schematic diagram of the structure of the upper annular water-stop wing ring and the cover plate described in this application;

[0020] In the attached diagram:

[0021] 1. Concrete base slab; 2. Well shaft; 3. Replacement section; 4. Lower annular water-stop wing ring; 5. Water-swellable rubber strip; 6. Upper annular water-stop wing ring; 7. Cover plate; 8. Grouting hole; 9. Vent hole; 10. First bolt hole; 11. Second bolt hole; 12. Fastening bolt; 13. Sealing ring; 14. Grouting pipe; 15. First grouting pump; 16. Cement slurry tank; 17. Water glass tube; 18. Second grouting pump; 19. Water glass agent tank; 20. Motor. Detailed Implementation

[0022] Based on the background technology described, as shown in the appendix Figure 1 ~Appendix Figure 3 As shown, this application provides a seepage path sealing structure around a dewatering well, including a concrete base slab 1 and a well cylinder 2 embedded in the concrete base slab 1. The well cylinder 2 is cut off from the lower end of the concrete base slab 1 to form a replacement part 3. The replacement part 3 is fixedly connected to the upper opening of the cut-off well cylinder 2. The lower end of the replacement part 3 is provided with a lower annular water-stop wing ring 4, and the outer edge of the lower annular water-stop wing ring is provided with a water-swellable rubber strip 5.

[0023] The upper end of the replacement part 3 is provided with an upper annular water-stop wing ring 6, and the upper surface of the upper water-stop wing ring is provided with a cover plate 7 covering the upper opening of the replacement part 3; the cover plate 7 has a grouting hole 8 and an air vent 9 at the corresponding position of the upper opening of the replacement part 3.

[0024] In the above technical solution, the well shaft 2 exists before the concrete base slab 1. In specific implementation, the cutting position of the well shaft 2 is predetermined based on the designed pouring height of the concrete base slab 1. The cutting operation must ensure that the upper end face of the remaining part of the well shaft 2 after cutting is at the same elevation as the top surface of the concrete base slab 1, and the lower end face extends below the bottom surface of the concrete base slab 1, to ensure that the subsequent replacement part 3 can be stably embedded in the concrete base slab 1. After cutting, the inside of the well shaft 2 is filled with cohesive soil and compacted in layers until it reaches near the upper opening of the well shaft 2. Then, a steel plate adapted to the upper opening of the well shaft 2 is used to weld the steel plate to the edge of the upper opening of the well shaft 2 to form a preliminary seal. In specific implementation, the cohesive soil is granular material with a particle size of 2.5~3.0 mm. Moreover, in specific implementation, the outer diameters of the upper annular water-stop wing ring 6 and the lower annular water-stop wing ring 4 are the same.

[0025] In this application, the material strength of the replacement part 3 is superior to that of the well shaft 2. A replacement part 3 matching the specifications of the cut-off well shaft 2 is selected, and the lower end of the replacement part 3 is welded to the upper opening of the cut-off well shaft 2. A lower annular water-stop wing ring 4 is welded to the lower end of the replacement part 3, and an annular water-stop wing ring 6 is welded to the upper end of the replacement part 3. Both water-stop wing rings are tightly connected to the outer wall of the replacement part 3. Then, a water-swellable adhesive strip 5 is pasted onto the outer edge of the lower annular water-stop wing ring 4. Before pasting, impurities on the surface of the water-stop wing ring must be cleaned to ensure that the adhesive strip adheres tightly to the water-stop wing ring. The water-swellable adhesive strip 5 expands rapidly upon contact with water, sealing the gap between the well shaft 2 and the concrete slab. The water-swellable adhesive strip 5 can be achieved using existing technology, such as the PN water-swellable water-stop strip.

[0026] In practical implementation, a concrete base slab 1 is poured according to design requirements, embedding the replacement part 3, the lower annular water-stop wing ring 4, and the lower part of the upper annular water-stop wing ring 6 into the concrete base slab 1. The concrete, in conjunction with the replacement part 3 and the water-stop wing ring, forms a preliminary structural anti-seepage system. A cover plate 7 is installed on the upper surface of the upper annular water-stop wing ring 6, covering the upper opening of the replacement part 3. The cover plate 7 has corresponding grouting holes 8 and vent holes 9. A sealing ring 13 is installed between the upper annular water-stop wing ring 6 and the cover plate 7. Fastening bolts 12 pass through the first bolt hole 10 circumferentially on the upper annular water-stop wing ring 6 and the corresponding second bolt hole 11 on the cover plate 7, securing the cover plate 7 to the upper annular water-stop wing ring 6 and achieving a seal.

[0027] After the concrete base slab 1 reaches its design strength, a grouting system is installed around the replacement section 3. The grouting system includes a grouting pipe 14 connected to the grouting holes 8 on the cover plate 7, a first grouting pump 15 connected to the first grouting pump 15 connected to the cement slurry tank 16, and a water glass pipe 17 connected to the grouting pipe 14, a second grouting pump 18 connected to the second grouting pump 18 connected to the water glass agent tank 19. Cement slurry and water glass agent are injected into the replacement section 3 through the grouting system to fill the internal space and enhance the sealing effect, ultimately sealing the seepage path around the dewatering well.

[0028] In practice, pressure grouting is employed, with the grouting pressure controlled at 2-3 MPa. Cement grout and water glass are injected simultaneously into the grouting pipe to accelerate the setting time of the grouting agent and improve the stability of the well sealing. Water glass additive is added only after the grout discharged from vent hole 9 reaches its initial setting state. After pressure grouting stops, the valves of water glass pipe 17 and the grouting pipe are closed. After the grouting agent has solidified, the valve connected to grouting hole 8 is removed, and the surrounding area is checked for leakage. If no leakage is found, the reserved groove of the dewatering well is encased in concrete a second time, completing the well sealing. In practice, the grouting system is equipped with a motor 20, which is electrically connected to the grouting pump to drive the grouting.

[0029] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0030] The above description is merely an embodiment of this application and is not intended to limit the scope of 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 principles of this application should be included within the scope of the claims of this application.

Claims

1. A structure for sealing seepage paths around a dewatering well, comprising a concrete base slab and a well cylinder embedded in the concrete base slab, characterized in that, The well shaft is cut off from the lower end of the concrete base slab to form a replacement section, and the replacement section is fixedly connected to the upper opening of the cut-off well shaft. The lower end of the replacement part is provided with a lower annular water-stop wing ring, and the outer edge of the lower annular water-stop wing ring is provided with a water-swellable rubber strip; The upper end of the replacement part is provided with an upper annular water-stop wing ring, and the upper surface of the upper annular water-stop wing ring is provided with a cover plate covering the upper opening of the replacement part; the cover plate has a grouting hole and an air vent at the corresponding position of the upper opening of the replacement part.

2. The seepage path sealing structure around a dewatering well according to claim 1, characterized in that, The well shaft is filled with cohesive soil and the wellhead is sealed with a steel plate at the top.

3. The seepage path sealing structure around a dewatering well according to claim 2, characterized in that, The replacement part is welded to the steel plate.

4. The seepage path sealing structure around a dewatering well according to claim 1, characterized in that, The upper annular water-stop wing ring has a plurality of first bolt holes arranged in a circumferential annular array, and the cover plate has second bolt holes aligned with the first bolt holes. Fastening bolts are provided in the first bolt holes and the second bolt holes.

5. The seepage path sealing structure around a dewatering well according to claim 1, characterized in that, A sealing ring is provided between the upper annular water-stop wing ring and the cover plate.

6. The seepage path sealing structure around a dewatering well according to claim 1, characterized in that, The replacement part is equipped with a grouting system on its outer periphery. The grouting system includes a grouting pipe connected to the grouting hole and a first grouting pump connected to the grouting pipe. The first grouting pump is equipped with a cement slurry tank.

7. The seepage path sealing structure around a dewatering well according to claim 6, characterized in that, The grouting system also includes a water glass pipe connected to the grouting pipe and a second grouting pump connected to the water glass pipe, the second grouting pump being equipped with a water glass agent tank.

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