The Construction Method of Rapid Well Closing for Foundation Pit Dewatering Well
A construction method and technology for dewatering wells, applied in infrastructure engineering, construction, etc., can solve problems such as difficulty in controlling the quality of underwater grouting and plugging, failure of filter tube plugging, long construction period, etc. The effect of preventing water seepage and convenient construction
Active Publication Date: 2021-11-02
CHINA RAILWAY DEV INVESTMENT CO LTD
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Problems solved by technology
This method has the problems of long construction period, high cost, and difficulty in controlling the quality of underwater grouting plugging, which leads to the failure of filter pipe plugging
Method used
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Embodiment Construction
[0029] Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, and therefore are only examples, and should not be used to limit the scope of protection of this patent.
[0030] Such as Figure 1-Figure 4 As shown, the present invention provides a kind of construction method of quick closure of foundation pit dewatering well, comprising the following steps:
[0031] Step S1, such as figure 1 As shown, before the downwater well pipe 1 is lowered, the sealing ring 2 is welded on the inner peripheral surface of the downwater well pipe 1 near the top of the filter pipe 11 in advance. Tapered hole 21, the drain pipe 3 is passed through the tapered hole 21 in advance, and the lower end of the drain pipe 3 is connected to the plugging head 4, the plugging head 4 is a tapered plug with...
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The invention discloses a construction method for fast sealing of a foundation pit dewatering well. The method comprises the following steps: after the bottom plate of the foundation pit is poured, the water pump stops pumping water, and the water level in the dewatering well pipe rises to a static state; and then the drain pipe is pulled up , until the plugging head is pulled into and blocked in the tapered hole of the plugging ring; then the pump is restarted, and the pump drains the water in the dewatering well pipe above the plugging ring; then the pump stops drawing water, and the Pull out the screw on the plugging head from the lower end of the drainage pipe, and pull the drainage pipe out of the dewatering well pipe; then cut off the dewatering well pipe above the bottom of the foundation pit; then insert the gasket and nut into the screw rod of the plugging head through the installation tool And tighten the nut; then pour concrete in the dewatering well pipe above the sealing ring. The invention not only facilitates construction, but also has fast construction speed, can reduce construction cost and improve construction quality.
Description
technical field [0001] The invention relates to the technical field of foundation pit construction, in particular to a construction method for quick well closure of a foundation pit dewatering well. Background technique [0002] In the stratum with confined water, in order to prevent instability problems such as flowing soil and sudden surge at the bottom of the foundation pit during the excavation process, dewatering wells are often set in the foundation pit to reduce the confined water level in the foundation pit to ensure that the foundation pit construction safety. Under normal circumstances, after the bottom plate is poured, the dewatering work is over, and the dewatering well needs to be sealed. The existing dewatering well is generally sealed by grouting, that is, in the still water state, injecting water into the dewatering well pipe Cement slurry, the cement slurry enters the surrounding of the dewatering well pipe through the filter pipe to block the gap of the fi...
Claims
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IPC IPC(8): E02D19/10
CPCE02D19/10
Inventor 戴斌张鹏徐正帅顾章和李明辉曲东魁向中华徐跃杨利德陈琦王志博
Owner CHINA RAILWAY DEV INVESTMENT CO LTD