Rapid plugging method for dewatering well in high-water-level area

Abstract

The invention relates to construction precipitation, in particular to a rapid plugging method for a precipitation well in a high-water-level area. Comprising the following steps that S1, after foundation pit dewatering, a water pump is installed in a dewatering shaft; s2, pumping water from the dewatering shaft; s3, after water is pumped to a set height, the water pump is removed; s4, mounting a water interception air bag; s5, the space from the water interception air bag to the top of the shaft is filled with concrete; and S6, the blind plate is installed, and plugging of the dewatering well is completed. The problem that the blind plate welding construction time is short due to the fact that the water level in the dewatering well rises fast in a high-water-level area can be effectively solved; construction operation is convenient, the field operation requirement is met, and the method is suitable for underground foundation construction with high water level; the quality problem caused by time shortage during dewatering well plugging is effectively solved, meanwhile, the operation difficulty is lowered, the actual problems existing in a construction site are solved, and social benefits are improved.

Description

Technical Field

[0001] The invention relates to construction dewatering, in particular to a method for quickly plugging dewatering wells in high water level areas. Background Art

[0002] In public buildings, new urban buildings are increasingly being built underground. The water level in some plain areas is relatively high, and it is necessary to use precipitation wells to lower the groundwater level during underground foundation construction. The height of the precipitation well is generally a steel well with a diameter of 300mm and a height of 1m. After the underground structure construction is completed, the well will be sealed. However, due to the high groundwater level, the water level in the well will rise in about 20 minutes after the groundwater in the well is pumped out, and the blind plate welding operation for the well sealing will take at least half an hour, making it impossible to complete the well sealing operation. If concrete is used to seal the well after the water level in the precipitation well drops, the concrete will not reach initial setting in 20 minutes, and groundwater will penetrate to the top, affecting the welding operation. Summary of the invention

[0003] The present invention aims to solve the above technical problems, thereby providing a method for quickly plugging precipitation wells in high water level areas and improving the plugging efficiency of precipitation wells.

[0004] The present invention solves the technical problem and adopts the following technical solution: A method for quickly plugging a precipitation well in a high water level area comprises the following steps: S1. After the foundation pit is dewatered, a water pump is installed in the dewatering shaft; S2, pumping water from the precipitation wellbore; S3, remove the water pump after pumping water to the set height; S4. Install water-blocking airbag; S5. Fill the space from the water cut-off air bag to the top of the wellbore with concrete; S6. Install the blind plate and seal the drainage well.

[0005] Compared with the prior art, the present invention using the above technical solution has the following beneficial effects: 1) It can effectively solve the problem of tight blind plate welding construction time caused by the rapid rise of water level in precipitation wells in high water level areas; 2) The construction operation is convenient, meeting the on-site operation requirements, and is suitable for underground foundation construction with high water levels; 3) Effectively improve the quality problems caused by time constraints when sealing precipitation wells, while reducing the difficulty of operation, solving practical problems existing on the construction site and improving social benefits.

[0006] Further, the optimization scheme of the present invention is: In step S4, after the water-cutting airbag is inflated, the wall of the water-cutting airbag is in full contact with the inner wall of the drainage wellbore.

[0007] In step S4, the distance between the top of the water-cutting airbag and the top of the wellbore is greater than 300 mm.

[0008] In the step S5, the concrete is impermeable concrete.

[0009] In step S5, the model of concrete is C35P8. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the installation of a dewatering shaft according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of a water-cutting airbag according to an embodiment of the present invention; Figure 3 Schematic diagram of blind plate installation according to an embodiment of the present invention.

[0011] In the figure: water-cutting airbag 1; concrete 2; blind plate 3; outer wall of sump 4; precipitation well 5. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0013] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0014] See also Figure 1 This embodiment provides a method for quickly plugging a precipitation well in a high water level area, which is performed in the following steps: S1. After the foundation pit is dewatered, the dewatering well pipe is removed and a water pump is installed in the dewatering well shaft 5.

[0015] S2, start the water pump, and the water pump pumps water from the precipitation well 5.

[0016] S3. The water pump pumps the water level in the dewatering shaft 5 to a position 800 mm from the top of the dewatering shaft 5, and then moves the water pump out.

[0017] S4. Install water cut-off airbag 1 ( Figure 2As shown), the specification model of the water-cutting airbag 1 is DN300, which is adapted to the inner diameter of the precipitation wellbore 5. The distance between the top of the water-cutting airbag 1 and the top of the wellbore 5 is greater than 300 mm. After the water-cutting airbag 1 is inflated, the water-cutting airbag wall 1 is completely in contact with the inner wall of the precipitation wellbore 5, and the water-cutting airbag 1 is installed.

[0018] S5. After the water-cutting airbag 1 is installed, fill the space from the water-cutting airbag 1 to the top of the drainage well 5 with C35P8 anti-seepage concrete 2 ( Figure 3 as shown).

[0019] S6. After the dewatering shaft 5 is filled, the steel blind plate 3 is installed. The blind plate 3 is welded to the top of the dewatering shaft 5, and the dewatering well is sealed.

[0020] The present invention blocks the water level rise by means of the water-cutting airbag, thereby providing sufficient operation time for the closing welding of the dewatering shaft, and achieving the purpose of permanent closing of the dewatering shaft. This method is convenient in obtaining materials, has low operating difficulty and high construction efficiency.

[0021] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for quickly plugging a precipitation well in a high water level area, comprising the following steps: S1. After the foundation pit is dewatered, a water pump is installed in the dewatering shaft; S2, pumping water from the precipitation wellbore; S3, remove the water pump after pumping water to the set height; S4. Install water-blocking airbag; S5. Fill the space from the water cut-off air bag to the top of the wellbore with concrete; S6. Install the blind plate and seal the drainage well.

2. The method for rapid plugging of precipitation wells in high water level areas according to claim 1 is characterized by: In step S4, after the water-cutting airbag is inflated, the wall of the water-cutting airbag is in full contact with the inner wall of the drainage wellbore.

3. The method for rapid plugging of precipitation wells in high water level areas according to claim 1 is characterized by: In step S4, the distance between the top of the water-cutting airbag and the top of the wellbore is greater than 300 mm.

4. The method for rapid plugging of precipitation wells in high water level areas according to claim 1 is characterized by: In the step S5, the concrete is impermeable concrete.

5. The method for rapid plugging of precipitation wells in high water level areas according to claim 1 is characterized by: In step S5, the model of concrete is C35P8.

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