Stepped rapid precipitation device and method

Abstract

The invention relates to the field of water-rich deep sand layer waterproof curtain type ultra-deep foundation pit leakage pressure precipitation construction, in particular to a stepped rapid precipitation method which is a new precipitation concept and is successfully implemented in Shenyang north station of Shenyang subway line IV. According to the method, special medium-coarse sand high-water-permeability geological waterproof curtain type foundation pit leakage pressure dewatering construction serves as the background, and the defects that conventional dewatering is large in power consumption and slow in dewatering are overcome. Firstly, the funnel surface forming time of the conventional single-row layout dewatering well is long; secondly, according to traditional precipitation, precipitation wells need to be opened at the same time through the group well effect, and power consumption is large; thirdly, precipitation construction in the construction process of foundation pit operation becomes a constraint factor of the foundation pit operation to a great extent; fourthly, the water level of the dewatering well automatically controls a water pump start-stop system, the water level outside the foundation pit is automatically controlled, and accurate dewatering is achieved. The method solves the problems that after the precipitation well is constructed, the speed is high, energy consumption is low, and the construction progress is limited by the water level effectively.

Description

technical field [0001] The application relates to the technical field of dewatering construction, in particular to a step-type rapid dewatering device and method. Background technique [0002] With the development of the country, the construction of ultra-deep water-stop curtain foundation pits is becoming more and more common in urban centers or important traffic areas. However, the construction environment factors are demanding, and the process arrangements are closely linked. Dewatering operations have become closely related to deep foundation pit construction. During the excavation of the water-stop curtain type deep foundation, the water level outside the pit needs to be relieved to different degrees during the construction period, and the dewatering construction has become the main constraint factor for the earthwork excavation construction, and the impact of rapid dewatering cannot be ignored. [0003] Under normal circumstances, the construction of downwelling wells ...

AI Technical Summary

Problems solved by technology

[0004] Generally, precipitation construction works through the group well effect. According to different precipitation depths, the time to achieve the effect is generally 14 days to 30 days. The response is slow, and the secondary treatment is time-consuming and time-consuming. It also has a strong impact on the ongoing construction machinery and equipment personnel. Operation high risk

[0005] The common mode of dewatering in common group wells consumes a lot of current and power, which leads to a lot of energy consumption and waste, high maintenance costs in the later period, and a great waste of construction costs and electric energy resources.

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