Front wall and rear pile composite double-row foundation pit supporting structure and construction method thereof

Abstract

The invention discloses a front wall and rear pile composite double-row foundation pit supporting structure and a construction method thereof. The front wall and rear pile composite double-row foundation pit supporting structure comprises supporting piles, a diaphragm wall, a connecting beam, a cover plate and a three-axis stirring pile, wherein the diaphragm wall is arranged along the side wall of a foundation pit in a full-length mode; a front-row crown beam is arranged at the top of the diaphragm wall; the supporting piles are arranged at intervals in the extending direction of the diaphragm wall, and a distance is reserved between the supporting piles and the diaphragm wall; a rear-row crown beam is arranged at the tops of the supporting piles; the connecting beam is connected betweenthe rear-row crown beam and the front-row crown beam; the cover plate is arranged in a rectangular frame defined by the rear-row crown beam, the front-row crown beam and the connecting beam; the horizontal section of the three-axis stirring pile is in a grid shape, and the three-axis stirring pile is arranged in a soil body at the bottom of the foundation pit in a mode of being tightly attached tothe front side face of the diaphragm wall; and the reinforcing width of the three-axis stirring pile is 5-10 times of the pile diameter of the supporting piles, and the length of the lower part of the three-axis stirring pile penetrating through a soft soil layer below the foundation pit is not smaller than one time of the wall thickness of the diaphragm wall. According to the front wall and rearpile composite double-row foundation pit supporting structure and the construction method thereof, the technical problems that a traditional double-row pile does not consider the difference of the stress characteristics of a front row of piles and a rear row of piles, the stress is unreasonable, and the construction process is complex are solved.

Description

technical field [0001] The invention belongs to the field of construction engineering, in particular to a front wall and rear pile composite double-row foundation pit supporting structure and a construction method thereof. Background technique [0002] As urban land becomes more and more tense, the trend of longitudinal extension of urban buildings is becoming more and more obvious. The concrete manifestations are that the upward construction is higher and higher, the downward excavation is deeper and deeper, the difficulty of building foundation pit support is gradually increasing, and There are often a large number of shopping malls, private houses, underground pipelines, subways and other facilities around urban construction projects. The surrounding environment is complex, and the site that can be used for the construction of foundation pit supporting structures is small. In this case, the construction of anchor rods will cause insufficient anchorage length, affecting the...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a composite double-row foundation pit support structure with front wall and rear piles and its construction method. It is necessary to solve the problem that the traditional double-row piles do not consider the difference in the force characteristics of the front and rear two rows of piles, unreasonable force and Technical problems with complicated construction techniques

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