Plugging method for high-water-level dewatering well

Abstract

The invention relates to the technical field of dewatering well plugging, in particular to a plugging method for a high-water-level dewatering well. The blocking method comprises the steps that S1, a pre-buried pit is formed in a floor surface layer and a structural bottom plate, a waterproof sleeve is provided and installed in the structural bottom plate, and the upper end of the waterproof sleeve extends into the pre-buried pit; s2, concrete is poured into the waterproof casing pipe to form a filling layer for blocking the waterproof casing pipe, and a sealed space is formed in the dewatering well; s3, cement paste is poured into the dewatering well through the water pump pipe, so that a cement paste layer for blocking the dewatering well is formed at the bottom of the filling layer; s4, after the cement paste layer reaches the design strength, providing a capping steel plate, and fixing the capping steel plate to the upper end of the waterproof sleeve; and S5, concrete is poured into the pre-buried pit, so that a sealing top layer is formed, and the waterproof sleeve is buried. The device has the beneficial effects that when the dewatering well is blocked, the waterproof sleeve is filled with concrete for blocking, so that a sealed space is formed in the dewatering well, and then cement paste is poured into the dewatering well through the water pump pipe, so that the situation that the water level in the dewatering well rises, and the poured cement paste gushes out upwards is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of plugging of dewatering wells, in particular to a plugging method for high-water-level dewatering wells. Background Art

[0002] In recent years, the construction sector in major cities has experienced rapid growth, with the number of super-high-rise buildings increasing year by year. For some super-high-rise buildings or those with many basement floors, the foundations are buried deep and the groundwater level is abundant. To ensure the pit bottom remains dry during construction, groundwater is usually collected into drainage wells. These wells must be sealed only after the foundation slab is constructed. The quality of the drainage well sealing significantly affects the foundation slab.

[0003] The traditional method for sealing a drainage well is to pump water to lower the water level in the well pipe, then quickly pour concrete into the well after the water level drops, and weld steel plates to seal the wellhead. However, if the groundwater level is high, the water pressure is high, and there is abundant groundwater, the sealing concrete may be washed out, causing groundwater to gush out of the wellhead. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for sealing high-water-level precipitation wells, so as to solve the problem that when the existing precipitation wells are sealed, the poured concrete will rise as the water level in the precipitation wells rises, resulting in upwelling.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a plugging method for a high-water-level precipitation well. A structural bottom plate and a floor surface layer are formed on the top of the precipitation well, and the floor surface layer is located above the structural bottom plate. A water pump and a water pump pipe are provided in the precipitation well. The plugging method specifically includes:

[0007] S1: Form a pre-buried pit between the floor surface and the structural base plate, and locate the pre-buried pit around the precipitation well. Provide a waterproof casing, install the waterproof casing in the structural base plate, and extend the upper end of the waterproof casing into the pre-buried pit.

[0008] S2: providing an annular bottom supporting steel plate, fixing the bottom supporting steel plate on the inner wall of the waterproof casing and passing the water pump pipe through the middle of the bottom supporting steel plate, and then pouring concrete into the waterproof casing to form a filling layer to seal the waterproof casing, so that the precipitation well forms a sealed space;

[0009] S3: After the concrete of the filling layer reaches the designed strength, cement slurry is poured into the water pump pipe, so that the cement slurry enters the precipitation well through the water pump pipe and the water pump, so as to form a cement slurry layer at the bottom of the filling layer to block the precipitation well;

[0010] S4: After the cement slurry layer reaches the designed strength, the water pump pipe is cut so that the upper end of the water pump pipe is flush with the upper end of the waterproof casing, and a capping steel plate is provided and fixed to the upper end of the waterproof casing;

[0011] S5: Pour concrete into the pre-buried pit to form a sealing top layer for burying the waterproof casing.

[0012] Furthermore, when pouring to form the structural base plate, a waterproof casing is installed in the precipitation well so that the waterproof casing is buried in the structural base plate.

[0013] Furthermore, when the waterproof sleeve is installed, an outer water-stop ring is fixed on the outside and buried in the structural base plate.

[0014] Furthermore, the filling layer formed by pouring has two layers, including a first filling layer and a second filling layer, and the first filling layer is poured before pouring the cement slurry layer, and the second filling layer is poured after pouring the cement slurry layer to completely seal the waterproof casing.

[0015] Furthermore, the specific steps of pouring to form the cement slurry layer are as follows:

[0016] Provide a water pump pipe valve, install the water pump pipe valve on the water pump pipe, and provide a grouting pipe with a valve, connect one end of the grouting pipe to the water pump pipe, and make the connection point below the water pump pipe valve;

[0017] Close the valve on the water pump pipe and open the valve on the grouting pipe, pour cement slurry into the grouting pipe, and let the cement slurry enter the dewatering well through the grouting pipe, water pump pipe and water pump;

[0018] Wait until the cement slurry overflows from the grouting pipe and close the valve on the grouting pipe.

[0019] Furthermore, a high-pressure injection pump is used to inject cement slurry into the grouting pipe.

[0020] Furthermore, when installing the water pump pipe valve, the water pump pipe valve is located in the waterproof casing, and when installing the grouting pipe, the valve on the grouting pipe is located in the waterproof casing, so that when pouring the second filling layer, the second filling layer buries the water pump pipe valve and the valve on the grouting pipe;

[0021] Before pouring the second filling layer, the water pump pipe and the grouting pipe are cut so that the upper ends of the water pump pipe and the grouting pipe are flush with the upper end of the waterproof casing.

[0022] Furthermore, before pouring the second filling layer, an inner water stop ring is provided and fixed to the inner wall of the waterproof sleeve.

[0023] Furthermore, after the capping steel plate is fixed to the waterproof casing, a waterproof coiled material is provided and laid on the surface of the waterproof casing and the capping steel plate.

[0024] Furthermore, after the bottom supporting steel plate is fixed, a water stop strip is provided and fixed to the connection between the bottom supporting steel plate and the waterproof sleeve and the connection between the bottom supporting steel plate and the water pump pipe.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) By burying a waterproof casing in the structural base plate, when sealing the precipitation well, first fill the waterproof casing with concrete to form a sealed space in the precipitation well, and then pour cement slurry into the precipitation well through the water pump pipe to prevent the water level in the precipitation well from rising and causing the poured cement slurry to gush upward.

[0027] 2) Fill the waterproof casing in two steps: first, fill the lower half of the casing to prevent cement slurry from flowing upward. After the cement slurry is poured, fill the upper half of the casing to completely seal the casing. Furthermore, by fixing a capping steel plate to the casing and attaching a covering waterproof membrane, the casing is further sealed to prevent groundwater from leaking and flowing upward.

[0028] 3) Install valves on the grouting pipe and water pump pipe. With the pump pipe valve closed, pour cement slurry into the dewatering well through the grouting pipe. When pouring the second filling layer, bury the valves on the grouting pipe and water pump pipe in the second filling layer to prevent leakage from the grouting pipe and water pump pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a cross-sectional view of the completed installation of the waterproof casing of the method for sealing a high water level dewatering well according to the present invention.

[0030] Figure 2 This is a cross-sectional view of the method for sealing a high-water-level dewatering well according to the present invention after the first filling layer is poured.

[0031] Figure 3 This is a cross-sectional view of the method for sealing a high-water-level dewatering well according to the present invention after pouring the cement slurry layer.

[0032] Figure 4 This is a cross-sectional view of the method for sealing a high-water-level dewatering well according to the present invention after the second filling layer is poured.

[0033] Figure 5 This is a structural cross-sectional view of the method for sealing a high-water-level dewatering well according to the present invention after construction is completed.

[0034] Legend: 1. Dewatering well; 2. Waterproof casing; 21. External water stop ring; 22. Bottom steel plate; 23. Water stop strip; 24. Internal water stop ring; 25. Capping steel plate; 3. Water pump; 31. Water pump pipe; 32. Water pump cable; 33. Water pump pipe valve; 4. Grouting pipe; 5. First filling layer; 6. Cement slurry layer; 7. Second filling layer; 8. Capping top layer. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] See Figure 1 The present invention provides a method for sealing high-water-level precipitation wells, which solves the existing problem of pouring concrete and causing it to surge upward as the water level in the precipitation well rises when the precipitation well is sealed. 1) A waterproof casing is buried in the structural base plate. When the precipitation well is sealed, the casing is first filled with concrete to form a sealed space in the precipitation well. Cement slurry is then poured into the precipitation well through a water pump pipe, thereby preventing the water level in the precipitation well from rising and causing the poured cement slurry to surge upward.

[0037] 2) Fill the waterproof casing in two steps: first, fill the lower half of the casing to prevent cement slurry from flowing upward. After the cement slurry is poured, fill the upper half of the casing to completely seal the casing. Furthermore, by fixing a capping steel plate to the casing and attaching a covering waterproof membrane, the casing is further sealed to prevent groundwater from leaking and flowing upward.

[0038] 3) Install valves on the grouting pipe and water pump pipe. With the pump pipe valve closed, pour cement slurry into the dewatering well through the grouting pipe. When pouring the second filling layer, bury the valves on the grouting pipe and water pump pipe in the second filling layer to prevent leakage from the grouting pipe and water pump pipe.

[0039] A method for sealing a high water level dewatering well according to the present invention will be described below with reference to the accompanying drawings.

[0040] See Figure 1 , showing a cross-sectional view of the waterproof casing installed in the method for sealing a high water level dewatering well according to the present invention. Figure 5 , shows the structural cross-section of the method for sealing a high water level dewatering well after the construction of the present invention is completed. Figure 1 and Figure 5 , a plugging method for a high water level dewatering well of the present invention is described.

[0041] like Figure 1 and Figure 5As shown, the present invention is a method for sealing a high-water level precipitation well. A structural bottom plate and a floor surface layer are formed on the top of the precipitation well 1, and the floor surface layer is located above the structural bottom plate. A water pump 3 and a water pump pipe 31 are provided in the precipitation well 1. The sealing method specifically includes:

[0042] S1: Form a pre-buried pit on the floor surface and the structural bottom plate, and make the pre-buried pit located around the precipitation well 1, provide a waterproof casing 2, install the waterproof casing 2 in the structural bottom plate, and make the upper end of the waterproof casing 2 extend into the pre-buried pit;

[0043] S2: Provide an annular bottom supporting steel plate 22, fix the bottom supporting steel plate 22 on the inner wall of the waterproof casing 2, and pass the water pump pipe 31 through the middle of the bottom supporting steel plate 22. Then, pour concrete into the waterproof casing 2 to form a filling layer to seal the waterproof casing 2, so that the precipitation well 1 forms a sealed space;

[0044] S3: After the concrete of the filling layer reaches the designed strength, cement slurry is poured into the water pump pipe 31, so that the cement slurry enters the precipitation well 1 through the water pump pipe 31 and the water pump 3, so as to form a cement slurry layer 6 at the bottom of the filling layer to block the precipitation well 1;

[0045] S4: After the cement slurry layer 6 reaches the designed strength, the water pump pipe 31 is cut so that the upper end of the water pump pipe 31 is flush with the upper end of the waterproof casing 2, and a capping steel plate 25 is provided and fixed to the upper end of the waterproof casing 2;

[0046] S5: pouring concrete into the pre-buried pit to form a sealing top layer 8 for burying the waterproof casing 2.

[0047] In a specific embodiment, when pouring to form the structural base plate, the waterproof sleeve 2 is installed in the precipitation well 1 so that the waterproof sleeve 2 is buried in the structural base plate.

[0048] In a specific embodiment, when the waterproof sleeve 2 is installed, an outer water stop ring 21 is fixed on the outside and buried in the structural base plate. The number of outer water stop rings 21 is 1 to 3 and they are spaced apart.

[0049] Specifically, the waterproof casing 2 is a galvanized steel pipe, and the capping steel plate 25 is fixed to the upper end of the waterproof casing 2 by welding.

[0050] Specifically, the water pump 3 is connected to a water pump cable 33 , the upper end of the water pump cable 33 extends upward from the precipitation well 1 . Before construction, water stop strips are arranged at intervals on the water pump cable 33 , and the water stop strips swell when exposed to water.

[0051] In one specific embodiment, the filling layer formed by pouring has two layers, including a first filling layer 5 and a second filling layer 7, and the first filling layer 5 is poured before pouring the cement slurry layer 6, and the second filling layer 7 is poured after pouring the cement slurry layer 6 to completely seal the waterproof sleeve 2.

[0052] Specifically, in step S2, when pouring concrete, the concrete is vibrated to make the concrete more compact. When the poured concrete reaches 70% of the design strength, the connection between the first filling layer 5 and the inner wall of the waterproof casing 2 is observed to check whether there is water in the precipitation well 1 leaking upward. If no leakage occurs between 72h and 96h, proceed to the next step. If leakage occurs, the leakage point is sealed in time.

[0053] In one embodiment, the specific steps of pouring to form the cement slurry layer 6 are as follows:

[0054] Provide a water pump pipe valve 33, install the water pump pipe valve 33 on the water pump pipe 31, and provide a grouting pipe 4 with a valve, connect one end of the grouting pipe 4 to the water pump pipe 31, and make the connection point below the water pump pipe valve 33;

[0055] Close the water pump pipe valve 33 and open the valve on the grouting pipe 4, pour cement slurry into the grouting pipe 4, so that the cement slurry enters the precipitation well 1 through the grouting pipe 4, the water pump pipe 31 and the water pump 3;

[0056] When the cement slurry overflows from the grouting pipe 4, close the valve on the grouting pipe 4.

[0057] Specifically, before pouring the cement slurry, add an early strength agent to the cement slurry so that the ratio of early strength agent to cement slurry is 1:0.5. When pouring the cement slurry, observe whether there is cement slurry leakage from the gap between the first filling layer 5 and the waterproof casing 2. If leakage occurs, seal it in time.

[0058] In a specific embodiment, a high-pressure injection pump is used to inject cement slurry into the grouting pipe 4 .

[0059] In a specific embodiment, when installing the water pump pipe valve 33, the water pump pipe valve 33 is located in the waterproof casing 2, and when installing the grouting pipe 4, the valve on the grouting pipe 4 is located in the waterproof casing 2, so that when the second filling layer 7 is poured, the second filling layer 7 buries the water pump pipe valve 33 and the valve on the grouting pipe 4;

[0060] Before pouring the second filling layer 7 , the water pump pipe 31 and the grouting pipe 4 are cut so that the upper ends of the water pump pipe 31 and the grouting pipe 4 are flush with the upper end of the waterproof sleeve 2 .

[0061] In one embodiment, before pouring the second filling layer 7, an inner water stop ring 24 is provided and fixed to the inner wall of the waterproof casing 2. When pouring the second filling layer 7, the concrete is vibrated, and when the strength of the concrete reaches 70% of the design strength, the capping steel plate 25 is fixed to the waterproof casing 2.

[0062] In a specific embodiment, after the capping steel plate 25 is fixed to the waterproof casing 2 , a waterproof roll is provided and laid on the surface of the waterproof casing 2 and the capping steel plate 25 .

[0063] Preferably, the waterproof membrane is an SBS modified asphalt waterproof membrane.

[0064] In one embodiment, after the bottom steel plate 22 is fixed, a water stop strip 23 is provided and fixed to the connection between the bottom steel plate 22 and the waterproof casing 2 and the connection between the bottom steel plate 22 and the water pump pipe 31. The water stop strip 23 expands when exposed to water, thereby improving the waterproof and water-isolating effects.

[0065] Specifically, the first filling layer 5, the second filling layer 7, and the top sealing layer 8 are all cast using micro-expansive concrete with an anti-seepage effect. The micro-expansive concrete is C40P12 micro-expansive concrete.

[0066] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A method for plugging a high-water level precipitation well, wherein a structural bottom plate and a floor surface layer are formed on the top of the precipitation well (1), and the floor surface layer is located above the structural bottom plate. A water pump (3) and a water pump pipe (31) are provided in the precipitation well (1), characterized in that: The blocking methods include: S1: forming a pre-buried pit on the floor surface layer and the structural bottom plate, and positioning the pre-buried pit around the precipitation well (1), providing a waterproof casing (2), installing the waterproof casing (2) in the structural bottom plate, and extending the upper end of the waterproof casing (2) into the pre-buried pit; S2: providing an annular bottom supporting steel plate (22), fixing the bottom supporting steel plate (22) on the inner wall of the waterproof casing (2) and passing the water pump pipe (31) through the middle of the bottom supporting steel plate (22), and then pouring concrete into the waterproof casing (2) to form a filling layer for sealing the waterproof casing (2), so that the precipitation well (1) forms a sealed space; S3: After the concrete of the filling layer reaches the designed strength, cement slurry is poured into the water pump pipe (31), so that the cement slurry enters the precipitation well (1) through the water pump pipe (31) and the water pump (3), so as to form a cement slurry layer (6) at the bottom of the filling layer to block the precipitation well (1); S4: After the cement slurry layer (6) reaches the designed strength, the water pump pipe (31) is cut so that the upper end of the water pump pipe (31) is flush with the upper end of the waterproof casing (2), and a capping steel plate (25) is provided and fixed to the upper end of the waterproof casing (2); S5: pouring concrete into the pre-buried pit to form a sealing top layer (8) for burying the waterproof casing (2).

2. A plugging method for a high water level dewatering well according to claim 1, characterized in that: When pouring to form the structural base plate, the waterproof sleeve (2) is installed in the dewatering well (1) so that the waterproof sleeve (2) is buried in the structural base plate.

3. The method for plugging a high water level dewatering well according to claim 1, wherein: When the waterproof sleeve (2) is installed, an outer water stop ring (21) is fixed on the outside, and the outer water stop ring (21) is buried in the structural bottom plate.

4. The method for plugging a high water level dewatering well according to claim 1, wherein: The filling layer formed by pouring has two layers, including a first filling layer (5) and a second filling layer (7), and the first filling layer (5) is poured before pouring the cement slurry layer (6), and the second filling layer (7) is poured after the cement slurry layer (6) is formed, so as to completely seal the waterproof sleeve (2).

5. A plugging method for a high water level dewatering well according to claim 4, characterized in that: The specific steps of pouring to form the cement slurry layer (6) are as follows: Providing a water pump pipe valve (33), installing the water pump pipe valve (33) on the water pump pipe (31), and providing a grouting pipe (4) with a valve, connecting one end of the grouting pipe (4) to the water pump pipe (31), with the connection being located below the water pump pipe valve (33); Close the water pump pipe valve (33) and open the valve on the grouting pipe (4), pour cement slurry into the grouting pipe (4), and allow the cement slurry to enter the precipitation well (1) through the grouting pipe (4), the water pump pipe (31) and the water pump (3); When the cement slurry overflows from the grouting pipe (4), the valve on the grouting pipe (4) is closed.

6. A method for plugging a high water level dewatering well according to claim 5, characterized in that: A high-pressure injection pump is used to inject cement slurry into the grouting pipe (4).

7. The method for plugging a high water level dewatering well according to claim 5, characterized in that: When installing the water pump pipe valve (33), the water pump pipe valve (33) is located in the waterproof casing (2), and when installing the grouting pipe (4), the valve on the grouting pipe (4) is located in the waterproof casing (2), so that when pouring the second filling layer (7), the second filling layer (7) buries the water pump pipe valve (33) and the valve on the grouting pipe (4); Before pouring the second filling layer (7), the water pump pipe (31) and the grouting pipe (4) are cut so that the upper ends of the water pump pipe (31) and the grouting pipe (4) are flush with the upper end of the waterproof sleeve (2).

8. The method for plugging a high water level dewatering well according to claim 4, characterized in that: Before pouring the second filling layer (7), an inner water stop ring (24) is provided and fixed on the inner wall of the waterproof sleeve (2).

9. The method for plugging a high water level dewatering well according to claim 1, wherein: After the capping steel plate (25) is fixed to the waterproof casing (2), a waterproof roll is provided and laid on the surface of the waterproof casing (2) and the capping steel plate (25).

10. The method for plugging a high water level dewatering well according to claim 1, characterized in that: After the bottom supporting steel plate (22) is fixed, a water stop strip (23) is provided and fixed to the connection between the bottom supporting steel plate (22) and the waterproof sleeve (2) and the connection between the bottom supporting steel plate (22) and the water pump pipe (31).

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