Combined leakage stoppage method for local leakage in foundation pit

Abstract

The invention discloses a combined leakage stoppage method for local leakage in a foundation pit. The combined leakage stoppage method comprises the steps that a row of light well points are arranged on the outer side of the foundation pit with local leakage; the water level is lowered below the bottom of a pit-in-pit by adopting the light well points; a grouting hole is formed; water pumping of the light well points is suspended; and grouting materials are poured into the grouting hole for blocking. According to the combined leakage stoppage method, the method for locally forming a water reduction curtain at the light well points is adopted, and a water interception curtain is rapidly formed, so that the water level is rapidly and locally lowered to the bottom end of the pit; then a grouting material grouting method is used for rapidly blocking the leakage point, and therefore, the purpose of leakage stoppage is achieved; and the light well points and the double-liquid grouting material are used for grouting and leakage stoppage, and more pertinence on the conditions that the pit-in-pit exists at the bottom of the foundation pit, and a geological soil layer where fender posts are not successfully overlapped is mainly silty soil and silty sand is achieved.

Description

technical field [0001] The application belongs to the technical field of leakage plugging in foundation pits, and in particular relates to a joint plugging method for local leakage in foundation pits. Background technique [0002] With the continuous development of traffic construction, more and more underpass tunnels are being built in cities. The rainwater pump house passing through the tunnel is a typical pit-in-pit. There is a deep pit at the bottom of the foundation pit, and the geological soil layer where the retaining piles are not successfully overlapped is mainly silt and sand. Partial seepage in the pit-in-pit Leakage is large, resulting in flow soil damage, unable to normal construction. At this time, the water level of the foundation pit cannot be lowered to the bottom of the pit, so it is difficult to continue excavation. Long-term leakage will affect the safety of the foundation pit, and the existing plugging technology is difficult to achieve fast plugging fo...

AI Technical Summary

Problems solved by technology

The rainwater pump house that passes through the tunnel is a typical pit-in-pit. There is a deep pit at the bottom of the foundation pit, and the geological soil layer where the retaining piles are not successfully overlapped is mainly silt and sand. Partial seepage in the pit-in-pit Leakage is large, resulting in flow soil damage, unable to carry out normal construction

At this time, the water level of the foundation pit cannot be lowered to the bottom of the pit, so it is difficult to continue excavation. Long-term leakage will affect the safety of the foundation pit, and the existing plugging technology is difficult to achieve rapid plugging for normal construction operations.

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