Excavating construction method for surge shaft in gravel and sandy soil layer

Abstract

The invention relates to an excavating construction method for a surge shaft in a gravel and sandy soil layer. The method comprises steps as follows: construction of rotary jet grouting combined cylinder piles, construction of raise-boring machine platform concrete, construction of a raise-boring machine as well as excavation and supporting of a sandy soil layer shaft body section. According to the method, high-pressure rotary jet grouting pile combined pile cylinders are used as raise-boring machine pilot shaft construction areas for the surge shaft in the gravel and sandy soil layer, annular steel arches are adopted for lower part layer-by-layer supporting under protection of a shaft top ring beam, excavation and deslagging are performed by the aid of a pilot shaft, vertical transport and hoisting equipment for excavating slag is not required to be mounted additionally, and the construction progress is greatly accelerated. For completion of excavation and supporting construction of the gravel and sandy soil layer with the depth being 15 m and the excavation diameter being 11.6 m, at least 60 days are required if the conventional drop shaft sinking method and the vertical excavation and wall protection method are adopted, the deslagging difficulty is very large, and the cost is very high; however, with the adoption of the method, the construction task can be completed within 42 days, and the grouting reinforcement effect of high-pressure rotary jet grouting piles in a colluvial gravel soil and rock block covering layer mainly comprising the gravel and sandy soil layer is good.

Description

technical field [0001] The invention relates to the field of surge well engineering, in particular to a construction method for excavating a surge well in gravel and sand layers. Background technique [0002] In the current field of surge well engineering, caisson method, direct stripping or vertical excavation method, and top-down retaining wall pouring excavation method are mainly used for excavation. The common point is that all slag materials are excavated through the top of the well. Dig transport. [0003] (1) caisson method [0004] Zhang Dengfeng published the paper "Application of caisson construction technology in the excavation of loose overburden of surge wells" published in the second issue of "Gansu Water Conservancy and Hydropower Technology" in 2010, introducing a caisson technology in surge wells with loose overburden For example, the side wall is supported by sinking while excavating, and the thickness of the retaining wall concrete varies from 0.5 to 1.5...

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Problems solved by technology

[0014] Aiming at the above-mentioned problems existing in the prior art, the present invention proposes a construction method for excavating surge wells in gravel and

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