A sealing structure for dewatering wells and its construction method

Abstract

This invention relates to a dewatering well sealing structure and its construction method, comprising a basement cushion layer, a basement floor slab, and dewatering well pipes. The basement cushion layer is provided on the basement floor slab, and dewatering well pipes are vertically installed on the cushion layer and the basement floor slab. A fixing ring is installed on the lower inner side of the dewatering well pipe, and a lower water-stop plate is installed below the fixing ring. A primary seal is filled on the upper part of the lower water-stop plate, and an upper water-stop plate is installed on the primary seal. A secondary seal is filled on the upper part of the upper water-stop plate. This invention features improved water-stopping effect, reduced leakage risk, reduced construction costs, and increased construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of deep foundation pit construction technology, and in particular to a dewatering well sealing structure and its construction method. Background Technology

[0002] With the improvement of people's living standards, the rapid development of urban construction, and the vigorous development and utilization of underground space, deep foundation pit structures are becoming increasingly common. In areas rich in groundwater, the groundwater level inside deep foundation pits is high, making dewatering an essential construction step. Generally, deep well point dewatering is used, and the success of sealing the dewatering wells directly affects the overall construction quality of the project. This paper describes the construction process and quality control measures for sealing dewatering wells in two scenarios, based on the groundwater level, to ensure that the sealing of the dewatering wells meets the requirements for basement waterproofing. Practice has proven that this construction method has good application results and is worth promoting. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a sealing structure for dewatering wells and its construction method. By pre-reserving a fixing ring on the inner side of the dewatering well, conditions are provided for effective sealing in the later stage. The upper and lower water-stop plates, as well as the primary and secondary sealing structures, achieve efficient water stopping. It can adapt to ordinary dewatering wells and pressure relief wells, adapt to different groundwater levels, and significantly reduce the risk of leakage in the later stage. The water stopping effect is good and has strong promotion and application value.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to provide a dewatering well sealing structure, including a basement cushion layer, a basement floor slab and a dewatering well pipe, wherein a basement cushion layer is provided on the basement floor slab, and a dewatering well pipe is vertically installed on the basement cushion layer and the basement floor slab, a fixing ring is installed on the lower inner side of the dewatering well pipe, a lower water stop plate is installed on the lower side of the fixing ring, a primary sealing layer is filled on the upper part of the lower water stop plate, an upper water stop plate is installed on the primary sealing layer, and a secondary sealing layer is filled on the upper part of the upper water stop plate.

[0005] In this technical solution, a fixing ring is set to facilitate the installation of the lower waterstop plate. The installation of the lower waterstop plate facilitates the filling of the primary sealing. The lower and upper waterstop plates are used to achieve a double-layer waterstop setting. At the same time, the primary and secondary sealing are set to ensure the double-layer waterstop structure and improve the waterstop effect.

[0006] As a supplement to this technical solution, the dewatering well pipe is provided with an upper water-stop ring and a lower water-stop ring installed side by side on the outer ring of the basement floor slab. The upper and lower water-stop rings are used to limit the dewatering well pipe and prevent it from being squeezed and deformed.

[0007] As a supplement to this technical solution, the height of the fixing ring is lower than the height of the basement slab. By setting a fixing ring with a height lower than the basement floor slab, the height of the lower waterstop can be limited.

[0008] As a supplement to this technical solution, the fixing ring has two notches symmetrically arranged at both ends. The width of the notches is greater than the thickness of the lower waterstop plate, and the distance between the two notches matches the diameter of the lower waterstop plate.

[0009] A construction method for a dewatering well plugging structure includes the following specific steps:

[0010] Step 1: Make an upper and lower water-stop ring from steel plates and weld them to the upper part of the dewatering well pipe. The upper water-stop ring is located in the upper half of the basement floor slab, and the lower water-stop ring is located in the lower half of the basement floor slab.

[0011] Step two: Fabricate a fixing ring and weld it to the upper part of the dewatering well pipe, with a gap between the two semi-circular steel plates. The fixing ring is located at the bottom of the basement slab.

[0012] Step 3: According to the precipitation plan, install precipitation well pipes and carry out precipitation operations;

[0013] Step four: After the foundation pit excavation is completed, construct the basement leveling layer and basement floor slab. The outer wall of the dewatering well pipe is effectively sealed to the basement floor slab via an upper and lower water-stop ring.

[0014] Step 5: After the dewatering construction is completed, make the lower waterstop plate, the diameter of which is slightly smaller than the inner diameter of the dewatering well pipe;

[0015] Step Six: If the groundwater level is higher than the basement level, install the lower waterstop plate below the fixing ring through the two notches on the fixing ring, and weld it tightly to the dewatering well pipe on all sides. If the groundwater level is lower than the basement level, place the lower waterstop plate above the fixing ring, and weld it tightly to the dewatering well pipe on all sides.

[0016] Step 7: Pour micro-expansion concrete to form a primary seal, with the upper end of the concrete at least 15 centimeters vertically from the top of the basement floor slab.

[0017] Step 8: After the initial setting of the concrete used for the initial sealing, cut the dewatering well pipe flush with the initial sealing.

[0018] Step 9: Make the upper waterstop plate, the diameter of which is equal to the inner diameter of the dewatering well pipe;

[0019] Step 10: Place the upper waterstop plate directly above the primary sealing area and weld it tightly to the dewatering well pipe around its perimeter.

[0020] Step 11: Pour micro-expansion concrete to form a secondary seal, with its upper end flush with the basement floor slab.

[0021] Beneficial effects: This invention relates to a sealing structure for dewatering wells and its construction method. By pre-reserving a fixing ring on the inner side of the dewatering well, conditions are provided for effective sealing in the later stage. Efficient water stopping is achieved through the upper and lower water-stop plates, as well as the primary and secondary sealing structures. It can adapt to ordinary dewatering wells and pressure-reducing wells, adapt to different groundwater levels, and significantly reduce the risk of leakage in the later stage. The water stopping effect is good and has strong promotion and application value. It has the characteristics of improving water stopping effect, reducing leakage risk, saving construction costs, and improving construction efficiency. Attached Figure Description

[0022] Figure 1 This is a structural view of the present invention before sealing;

[0023] Figure 2 This is a structural view of the present invention after sealing;

[0024] Figure 3 This is a top view of the present invention.

[0025] Diagram: 1. Dewatering well pipe, 2. Upper water-stop ring, 3. Lower water-stop ring, 4. Fixing ring, 5. Lower water-stop plate, 6. Upper water-stop plate, 7. Primary sealing, 8. Secondary sealing, 9. Basement floor slab, 10. Basement foundation layer, 11. Gap. Detailed Implementation

[0026] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0027] The embodiments of the present invention relate to a dewatering well plugging structure, such as... Figure 1 As shown in Figure 3, the system includes a basement level 10, a basement floor 9, and a dewatering well pipe 1. The basement floor 9 is installed on the basement level 10. The dewatering well pipe 1 is vertically installed on the basement level 10 and the basement floor 9. A fixing ring 4 is installed on the lower inner side of the dewatering well pipe 1. A lower waterstop plate 5 is installed on the lower side of the fixing ring 4. A primary seal 7 is filled on the upper end of the lower waterstop plate 5. An upper waterstop plate 6 is installed on the primary seal 7. A secondary seal 8 is filled on the upper side of the upper waterstop plate 6.

[0028] In this technical solution, a fixing ring 4 is set to facilitate the installation of the lower waterstop plate 5. The installation of the lower waterstop plate 5 facilitates the filling of the primary sealing 7. The lower waterstop plate 5 and the upper waterstop plate 6 are set to achieve a double-layer waterstop setting. At the same time, the primary sealing 7 and the secondary sealing 8 are set to ensure the achievement of the double-layer waterstop structure and improve the waterstop effect.

[0029] As a supplement to this technical solution, the dewatering well pipe 1 is provided with an upper water-stop ring 2 and a lower water-stop ring 3 installed side by side on the outer ring of the basement floor slab 9. The upper water-stop ring 2 and the lower water-stop ring 3 are used to limit the dewatering well pipe 1 and prevent the dewatering well pipe 1 from being squeezed and deformed.

[0030] As a supplement to this technical solution, the height of the fixing ring 4 is lower than the height of the basement slab 10. By setting the fixing ring 4 with a height lower than the basement slab 10, the height of the lower water stop can be limited.

[0031] As a supplement to this technical solution, the fixing ring 4 has two notches 11 symmetrically arranged at both ends. The width of the notches 11 is greater than the thickness of the lower waterstop plate 5, and the distance between the two notches 11 matches the diameter of the lower waterstop plate 5.

[0032] Example

[0033] The specific construction steps for sealing a water well are as follows:

[0034] Step 1: Make an upper water-stop ring 2 and a lower water-stop ring 3 from steel plates and weld them to the upper part of the dewatering well pipe 1. The upper water-stop ring 2 is located in the upper half of the basement floor slab 9, and the lower water-stop ring 3 is located in the lower half of the basement floor slab 9.

[0035] Step 2: Fabricate the fixing ring 4 and weld it to the upper part of the dewatering well pipe 1, with a gap between its two semi-circular steel plates. The fixing ring 4 is located at the bottom of the basement foundation 10.

[0036] Step 3: According to the precipitation plan, install precipitation well pipe 1 and carry out precipitation operations.

[0037] Step 4: After the foundation pit excavation is completed, construct the basement cushion layer 10 and the basement floor slab 9. The outer wall of the dewatering well pipe 1 is effectively sealed to the basement floor slab 9 through the upper water-stop ring 2 and the lower water-stop ring 3.

[0038] Step 5: After the dewatering construction is completed, make the lower waterstop 5, whose diameter is slightly smaller than the inner diameter of the dewatering well pipe 1.

[0039] Step 6: If the groundwater level is higher than the basement level 10, install the lower waterstop 5 below the fixing ring 4 through the two notches 11 on the fixing ring 4, and weld it tightly to the dewatering well pipe 1 on all sides. If the groundwater level is lower than the basement level 10, place the lower waterstop 5 above the fixing ring 4, and weld it tightly to the dewatering well pipe 1 on all sides.

[0040] Step 7: Pour micro-expansion concrete to form a primary seal 7, with its upper end at least 15 centimeters vertically from the top of the basement floor slab 9.

[0041] Step 8: After the concrete of the first sealing 7 has initially set, cut the dewatering well pipe 1 to be flush with the first sealing 7.

[0042] Step 9: Make the upper waterstop plate 6, the diameter of which is equal to the inner diameter of the dewatering well pipe 1.

[0043] Step 10: Place the upper waterstop 6 directly above the primary sealing 7 and weld it tightly to the dewatering well pipe 1 around its perimeter.

[0044] Step 11: Pour micro-expansion concrete to form a secondary seal 8, the upper end of which is flush with the basement floor slab 9.

[0045] The above provides a detailed description of a dewatering well plugging structure provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A sealing structure for a dewatering well, characterized in that: The system includes a basement floor slab (9), a basement leveling layer (10), and a dewatering well pipe (1). The basement floor slab (9) is installed on the basement leveling layer (10). A dewatering well pipe (1) is vertically installed on the basement floor slab (9) and the basement leveling layer (10). A fixing ring (4) is installed inside the dewatering well pipe (1). A lower waterstop plate (5) is installed below the fixing ring (4). A primary seal (7) is filled on the upper end of the lower waterstop plate (5). An upper waterstop plate (7) is installed on the primary seal (7). 6) The upper side of the upper waterstop plate (6) is filled with secondary sealing (8). The upper waterstop ring (2) and the lower waterstop ring (3) are installed side by side on the outer ring of the dewatering well pipe (1) located at the basement floor slab (9). The height of the fixing ring (4) is lower than the height of the basement cushion layer (10). The two ends of the fixing ring (4) are symmetrically provided with two notches (11). The width of the notches (11) is greater than the thickness of the lower waterstop plate (5). The distance between the two notches (11) matches the diameter of the lower waterstop plate (5).

2. A construction method for a dewatering well plugging structure as described in claim 1, characterized in that: The specific steps include the following: Step 1: Make an upper water-stop ring (2) and a lower water-stop ring (3) from steel plates and weld them to the upper part of the dewatering well pipe (1). The upper water-stop ring (2) is located in the upper half of the basement floor slab (9), and the lower water-stop ring (3) is located in the lower half of the basement floor slab (9). Step 2: Make a fixing ring (4) and weld it to the upper part of the dewatering well pipe (1). There is a gap between the two semi-circular steel plates. The fixing ring (4) is located at the bottom of the basement foundation (10). Step 3: According to the precipitation plan, install precipitation well pipes (1) and carry out precipitation operations; Step 4: After the foundation pit is excavated, the basement cushion layer (10) and basement floor slab (9) are constructed; the outer wall of the dewatering well pipe (1) is effectively sealed to the basement floor slab (9) through the upper water-stop ring (2) and the lower water-stop ring (3); Step 5: After the dewatering construction is completed, make the lower waterstop (5), the diameter of which is slightly smaller than the inner diameter of the dewatering well pipe (1); Step 6: If the groundwater level is higher than the basement level (10), install the lower waterstop (5) through the two notches (11) on the fixing ring (4) below the fixing ring (4), and weld it tightly to the dewatering well pipe (1) around the perimeter; if the groundwater level is lower than the basement level (10), place the lower waterstop (5) above the fixing ring (4), and weld it tightly to the dewatering well pipe (1) around the perimeter. Step 7: Pour micro-expansion concrete to form a primary seal (7), with its upper end at a vertical distance of not less than 15 cm from the top of the basement floor slab (9); Step 8: After the concrete of the first sealing (7) has initially set, cut the dewatering well pipe (1); Step 9: Make the upper waterstop plate (6), the diameter of which is equal to the inner diameter of the dewatering well pipe (1); Step 10: Place the upper waterstop plate (6) directly above the primary sealing (7) and weld it tightly to the dewatering well pipe (1) around its perimeter. Step 11: Pour micro-expansion concrete to form a secondary seal (8), the upper end of which is flush with the basement floor slab (9).

Images