Subway sand layer open cut pit construction method

Abstract

The invention relates to the field of municipal rail traffic construction, and especially relates to a subway sand layer open cut pit construction method. The subway sand layer open cut pit construction method comprises the following steps: underground diaphragm wall, high pressure jet grouting water-head pile, three-axis mixing pile, foundation uplift pile, underground draining well, observationwell outside a pit, earth excavation, steel shotcrete erection, substrate treatment, waterproof construction, and structure construction. Through the underground diaphragm wall and steel shotcrete, aclosed integrated is formed, and foundation pit water leakage effect is greatly improved. The method ensures smooth construction of a subway foundation pit in a narrow space region in a city. Using the open cut pit method, subway open-cut station construction is safer and more efficient.

Description

technical field [0001] The invention relates to the field of municipal rail transit construction, in particular to a method for constructing an open-cut foundation pit in a subway sand layer. Background technique [0002] my country is currently in the peak period of subway construction, and the construction method of subway open-cut stations has been relatively mature, especially in general strata, the earthwork excavation process is relatively simple, but for weak water-rich sand layers, the traditional construction method is difficult to carry out, sand The soil in the layer is soft and cannot form a bearing layer. If a tiny detail is not handled properly, water gushing and sand gushing may occur. Not only will it affect the construction progress, but also there is a great risk to the safety of the foundation pit. Contents of the invention [0003] The invention provides an open-cut foundation pit construction method for a subway sand layer in order to carry out earthwo...

AI Technical Summary

Problems solved by technology

[0002] my country is currently in the peak period of subway construction, and the construction methods of subway open-cut stations are relatively mature, especially in general strata, the earthwork excavation process is relatively simple, but for soft and water-rich sand layers, traditional construction methods are difficult to carry out, sand The soil in the layer is soft and cannot form a bearing layer. If a tiny detail is not handled properly, water gushing and sand gushing may occur.

Not only will it affect the construction progress, but also pose a great risk to the safety of the foundation pit

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