Plugging method for dewatering well in foundation pit

A technology for dewatering wells and foundation pits, which is applied in basic structure engineering, construction, etc., and can solve problems such as permanent water seepage of the structural floor, failure to block, incorrect location of dewatering wells, etc.

Inactive Publication Date: 2021-04-13
CHINA MCC5 GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the groundwater level is high and the water volume is abundant, due to reasons such as incorrect selection of the location of the dewatering well and imperfect traditional construction

Method used

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  • Plugging method for dewatering well in foundation pit
  • Plugging method for dewatering well in foundation pit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: See figure 1 with figure 2 , a method for plugging a dewatering well in a foundation pit according to the present embodiment includes the following steps: S1: select the position of the dewatering well, and insert a steel pipe 2 as the well wall of the dewatering well; S2: weld a water stop ring on the neck of the steel pipe 2 4. Weld the connecting ring 21 on the top of the steel pipe 2; S3: Install the waterproof coiled material 7 on the outer wall of the steel tube 2, and the waterproof coiled material 7 extends from the bottom of the well to the bottom of the water-stop ring 4; S4: Install a water-stop copper strip under the water-stop ring 4 Clamp 6, water-stop copper strip clamp 6 is used to clamp the waterproof membrane 7; S5: Lay the base plate 1 on both sides of the foundation pit and the dewatering well, and the base plate 1 is provided with a reserved sealing position, and the reserved sealing position Install the steel pipe 2 in the middle; S6: ...

Embodiment 2

[0028] Embodiment 2: In step S1 of this embodiment, dewatering wells are selected around the lowest point of the foundation pit, and the water level is lowered to 50 cm below the lowest point of the foundation pit. In the step S1 of this embodiment, excavation is also included. The steel pipe 2 is cut to be 25 cm lower than the top of the bottom plate 1. The steel pipe 2 has a wall thickness of 1-2 cm and a diameter of 30 cm. In step S1 of this embodiment, before the steel pipe 2 is inserted, a plurality of slurry holes are drilled on the bottom side wall of the steel pipe 2 . It can effectively spread the slurry, replacing the traditional method of spreading from the bottom of the precipitation well. In the step S3 of this embodiment, it includes brushing the adhesive on the outer wall of the steel pipe 2, and attaching a rainwater expansion water-stop strip under the water-stop ring 4, and rolling the waterproof coiled material 7 along the outer wall of the dewatering well u...

Embodiment 3

[0029] Embodiment 3: In step S7 of this embodiment, the manhole cover 5 is provided with a first steel pipe hole 51 and a second steel pipe hole 52, the first steel pipe hole 51 is used for grouting, and the second steel pipe hole 52 is used for pressure relief and overflow pulp. Gate valves are added in the first steel pipe hole 51 and the second steel pipe hole 52, which can be closed and opened at any time to control the grouting and unloading water head pressure. In the step S8 of this embodiment, after sealing the well cover 5 and grouting before the water pressure rises, open the second steel pipe hole 52, then open the first steel pipe hole 51, and inject pure cement slurry along the first steel pipe hole 51 , when the second steel pipe hole 52 has grout flowing out, close the second steel pipe hole 52, and carry out the second grouting; the grouting adopts cement water glass double liquid slurry, the ratio is 1:0.5, when the grouting pressure gauge shows that it reache...

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Abstract

The invention discloses a plugging method for a dewatering well in a foundation pit. The plugging method comprises the following steps that S1, the position of the dewatering well is selected, and a steel pipe is inserted to serve as the well wall of the dewatering well; S2, a water stop ring is welded to the neck of the steel pipe, and a connecting ring is welded to the top of the steel pipe; S3, a waterproof coiled material is arranged on the outer wall of the steel pipe and extends from the well bottom to the position below the water stop ring; S4, a water stop copper bar clamp is arranged below the water stop ring and used for clamping the waterproof coiled material; S5, bottom plates are laid on the two sides of the foundation pit and the two sides of the dewatering well, reserved plugging positions are arranged on the bottom plates, and steel pipes are arranged in the reserved plugging positions; S6, water pumps are placed in the steel pipes, water is cooled to the position 50cm below the lowest point of the foundation pit, and after a basement structure is completed, dewatering is stopped; S7, the water pumps are withdrawn, the dewatering well is filled with gravel, and a well lid with holes is additionally sealed on the connecting ring; and S8, grouting is conducted along the holes in the well lid. Underground confined water is plugged while pressure relief is conducted, the plugging quality is ensured, multiple waterproof measures are taken, and leakage of the structural bottom plates is avoided.

Description

technical field [0001] The invention relates to the field of foundation pit engineering, in particular to a method for plugging a dewatering well in a foundation pit. Background technique [0002] In the construction process of water-resistant slabs and rafts in the basement, due to the existence of underground confined water, the design usually sets up some dewatering wells around the foundation pit, increases the thickness of the structure, or adds anti-floating anchors to reduce the groundwater level and increase the resistance. float. However, because the width of the foundation pit is wide and the area of ​​the foundation pit is large, the water level in the middle of the foundation pit cannot be lowered by the dewatering wells around the foundation pit. Therefore, during the construction process, relevant units will add temporary dewatering wells in the center of the foundation pit or corresponding positions. , used to lower the water level of the foundation pit. [...

Claims

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Application Information

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IPC IPC(8): E02D19/06E02D19/10
CPCE02D19/06E02D19/10
Inventor 韩少博蒋应伟何刚何长林
Owner CHINA MCC5 GROUP CORP
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