Anti-seepage and leak-blocking construction method for excavation of subway foundation pit in soft soil area

Abstract

The invention discloses an anti-seepage and leak-blocking construction method for excavation of a subway foundation pit in a soft soil area, which comprises the following steps: 1) joint pre-reinforcement construction of an underground continuous wall: constructing a pre-reinforcement structure of a high-pressure rotary jet grouting pile, guiding holes, grouting by a sleeve valve pipe, sealing the holes, guiding the holes again and pre-burying the sleeve valve pipe for standby; and 2) the excavation of the foundation pit and the anti-seepage and leak-blocking construction: using surface floating earth for clearing and using the encased steel plate reinforcement method for anti-leak treatment for the situations that joints of the underground continuous wall have defects definitely and risk points are positioned below the excavation surface of the foundation pit, adopting the hole-guiding cyanogen injection condensing method for blocking of leak points with slight water leakage situation, adopting the horizontal hole grouting method for blocking for the water leak points with serious water leakage situation, and carrying out filling, grouting and reinforcement through the pre-buried sleeve valve pipe after completing the blocking. The method has reasonable design, convenient construction, comprehensive consideration, good anti-leak and leak-blocking effect, fast leak-blocking speed and can solve the problems of pipe blocking, poor anti-leak and leak-blocking effect, slow construction progress and the like in the existing anti-leak and leak-blocking construction.

Description

technical field [0001] The invention belongs to the technical field of anti-seepage and plugging construction of underground enclosure structures, and in particular relates to an anti-seepage and plugging construction method for excavating subway foundation pits in soft soil areas. Background technique [0002] In recent years, the construction of urban subways has continued to develop, especially in coastal cities. In subway construction, because the underground structure is greatly affected by the hydrogeological environment, if the groundwater level is high and the geological conditions are complex, the actual construction is easily affected by the seepage of the underground enclosure structure. Therefore, the anti-seepage and plugging of the subway underground enclosure structure is an important part of the entire subway construction, which determines the safety and quality of the construction. We must pay attention to the anti-seepage and plugging to ensure the smooth d...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an anti-seepage and plugging construction method for the excavation of subway foundation pits in soft soil areas, which is reasonable in design, convenient in construction, comprehensive in consideration, and leak-proof and plugging in ...

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