Grouting bottom-sealing structure and construction technology of deep foundation pit in high-pressure water-thick sandy pebble stratum

Abstract

The invention discloses a high-pressure-bearing water and thick sand and pebble formation deep foundation pit grouting bottom-sealing structure and a construction technology thereof. The high-pressure-bearing water and thick sand and pebble formation deep foundation pit grouting bottom-sealing structure comprises a waterproof curtain which is inserted into the ground; a slurry base plate, a slurry side wall and a slurry separation wall are formed below the waterproof curtain through grouting; the slurry side wall and the waterproof curtain are cemented closely; the slurry base plate, the slurry side wall and the slurry separation wall surround a base to form a plurality of U-shaped grouting cabins which are concaved downward; a slurry reinforcement layer is formed above the slurry base plate through secondary grouting. According to the high-pressure-bearing water and thick sand and pebble formation deep foundation pit grouting bottom-sealing structure and the construction technology thereof, the integral strength and stiffness of the pit bottom is increased through the U-shaped grouting cabin structure, the double functions of pit bottom reinforcement and seepage control are achieved, the problems of the effect on the stability of the pit bottom due to the buried depth increased high-pressure-bearing water and the pit bottom uplift caused by foundation pit excavation can be effectively solved, and meanwhile the lateral displacement of the pit wall and the settlement deformation of the surrounding environment are reduced well.

Description

technical field [0001] The invention relates to the field of pressurized water treatment of deep foundation pit engineering in thick sandy pebble formations, in particular to a grouting bottom sealing structure and construction technology for deep foundation pits in thick sandy pebble formations with high pressure water. Background technique [0002] At present, in deep foundation pit engineering, three methods are usually used to solve the engineering problems caused by confined water, such as precipitation outside the pit, vertical partition of curtain, and full grouting of the base. [0003] The first is the method of dewatering outside the pit. The design idea of ​​this method is: use underground diaphragm walls or bored piles, occlusal piles, and corresponding water-stop curtains as the enclosure structure. Confined water construction, the foundation pit excavation will be carried out after the confined water head drops to the elevation required by the design. The adva...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a deep foundation pit grouting sealing structure and its construction technology in sand and pebble strata with high pressure water thickness, so as to solve the problems of large grouting volume, high cost and long construction period in the existing method of grouting and sealing the whole range of base , there is a water leak in the basement, and the groundwater rushes to the rock and soil layer on the basement, and it is difficult to judge the problem of the leaking part

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