Precipitation inclined shaft in deep foundation pit and construction method of precipitation inclined shaft

Abstract

The invention discloses a precipitation inclined shaft in a deep foundation pit and a construction method of the precipitation inclined shaft. A shaft pipe is arranged in the precipitation inclined shaft, a filling layer is arranged between the outer wall of the shaft pipe and the inner wall of the precipitation inclined shaft, the middle-lower section of the filling layer is a filter section, andthe upper section of the filling layer is a sealing section; the bottom end of the shaft pipe is closed, an opening is formed in the shaft wall of the shaft pipe of the filter section, and a 60-meshor 80-mesh filter screen is wound outside the shaft pipe; the filter section is filled with gravel with the particle size of 3-7 mm; the sealing section is filled with clay, and the filling degree isnot lower than 90%; centering supporting legs in three directions are arranged on the lower section, the middle section and the upper section of the shaft pipe in the circumferential direction, the interval between every two centering supporting legs is 120 degrees, a centering support is fixed to the outer wall of the shaft pipe wound with the filter screen through screws, and one supporting legfaces the position over the other supporting leg; and the included angle between the precipitation inclined shaft and the vertical direction is 30-70 degrees. The precipitation inclined shaft and theconstruction method thereof have the beneficial effects that the lower space around the foundation pit is fully utilized, the problem that the ground surface construction space is insufficient is thoroughly solved, and the construction risk of damaging underground facilities such as pipelines and structures is avoided; and the safety and the stability of foundation pit engineering are effectivelyimproved.

Description

technical field [0001] The invention relates to the field of building construction, in particular to an inclined drainage shaft in a deep foundation pit and a construction method thereof. Background technique [0002] When the groundwater level is higher than the base elevation, effective groundwater control measures must be taken to ensure the safety and smooth implementation of the project is a problem that must be solved in the deep foundation pit project. Under the premise that water stop measures are technically infeasible or economically unreasonable, tube well dewatering is a commonly used groundwater control measure in deep foundation pit engineering. The design scheme for deep foundation pit tube well dewatering is usually to arrange a circle of tube wells along the periphery of the foundation pit at a certain interval within 1-2m outside the foundation pit support structure, and control the groundwater level in the foundation pit through network pumping and drainag...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problems existing in the prior art, the present invention proposes a dewatering inclined shaft in a deep foundation pit and its construction method. The application of this method solves the problem of deep foundation pits caused by the inability to use the traditional dewatering construction technology caused by the shortage of working space. Engineering water control problem

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