Anti-leakage treatment method for deep foundation pit excavation in water-rich silt stratum

A treatment method and deep foundation pit technology, applied in excavation, water conservancy projects, underwater structures, etc., can solve problems affecting the construction progress of foundation pit excavation, affecting the effect of leak prevention and plugging, and long residence time, etc., to achieve The effect of improving underground soil, saving cost and shortening construction period

CN112049115AInactive Publication Date: 2020-12-08CHINA RAILWAY 11TH BUREAU GRP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-12-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides an anti-leakage treatment method for deep foundation pit excavation in a water-rich silt stratum. The treatment method comprises the following specific steps that firstly, WSS slurry injection is adopted at the joint position of a continuous wall outside a foundation pit, then dewatering wells are arranged outside the foundation pit to reduce water pressure, a water pump isplaced in each dewatering well, manual exploration and excavation are started from second-layer earth excavation in the deep foundation pit, a Luoyang shovel is adopted for exploration and excavationto explore the water leakage situation of the joint positions of the underground continuous wall at the underground wall joints, and plugging measures are taken according to the water leakage situation; and after it is confirmed that all underground continuous wall joints of a manual exploration and excavation bin section are free of the water leakage situation, a slurry injection platform is arranged beside the foundation pit, meanwhile, multiple sand backfill windows are formed in the outer side of the foundation pit, and in the mechanical excavation process of the foundation pit, emergencytreatment is carried out in a slurry injection and concrete backfill manner under the water seepage condition. According to the method, the risk of water gushing and sand gushing is avoided, the effect that the subway deep foundation pit is rapidly and stably excavated to expose the bottom is achieved, the construction period is shortened, and the cost is saved.
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Description

technical field

[0001] The invention belongs to the field of foundation pit construction, and in particular relates to an anti-leakage treatment method for excavating deep foundation pits in water-rich silt sand formations. Background technique

[0002] The subway can quickly, safely and comfortably transport a large number of passengers, and has good social and economic benefits. Therefore, in recent years, the construction of urban subways has developed rapidly. However, since the subway construction is carried out underground, the underground structure is greatly affected by the hydrogeological environment, and there is a huge construction safety risk in the construction process of the subway civil engineering, which is easily affected by the seepage of the underground enclosure structure, especially when the enclosure When the protective structure is an underground diaphragm wall, the hidden danger of water seepage at its joints is even greater.

[0003] At present, in ...

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with drawings and embodiments. attached Figure 1 to Figure 5The drawings for the embodiments are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following technical solutions shown in the drawings are specific solutions of the embodiments of the present invention, and are not intended to limit the scope of the claimed invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right" etc. are based on those shown in the accompanying drawings. Orientation o...