Large-diameter conjoined CS pipe pile foundation pit support structure and construction method thereof

Abstract

The invention discloses a large-diameter conjoined CS pipe pile foundation pit support structure. The structure comprises a conjoined CS pipe pile; and a reinforced integral reinforced concrete crown beam is arranged at the top of the conjoined CS pipe pile. The structure is characterized in that the CS pipe pile consists of rotary jetting cement soil pipe piles and drilled cast-in-place thin-wall reinforced concrete pipe piles coaxially arranged; and the CS pipe piles are arranged side by side, and are engaged and joined at the rotary jetting cement soil pipe piles. The invention further discloses a construction method of the large-diameter conjoined CS pipe pile foundation pit support structure; and the construction method mainly comprises three steps. The large-diameter conjoined CS pipe pile technology realizes an integral support target of soil retaining and water stop, is high in foundation pit horizontal displacement control capacity, is stable and reliable in construction quality, cannot generate such environmental pollution problems as mud generation, and effectively reduces the construction cost while shortening the construction period.

Description

technical field [0001] The invention relates to the technical field of foundation pit support of civil construction engineering, in particular to a foundation pit support structure of large-diameter conjoined CS pipe piles and a construction method thereof. Background technique [0002] Since the 1990s, with the continuous emergence of large-scale commercial complexes, underground rail transit, and comprehensive transportation hubs, foundation pit projects in many cities in my country have experienced leapfrog development in scale, depth, and difficulty. Protection technology brings new challenges. In the traditional foundation pit support measures, the horizontal displacement control ability of the cement-soil gravity retaining wall and the soil nail wall is weak, and the stability against rain erosion is poor. In the design of foundation pits in soft soil areas, occlusal piles or double-row pile-type bored pile structures + internal support systems (outer anchor rods) are ...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a large-diameter conjoined CS pipe pile foundation pit support structure and its construction method, which solves the problems of the previous soil retaining and water-stop integrated foundation pit support technology. The deformation control ability is weak, the construction quality is difficult to guarantee, and it is easy to cause surrounding environmental pollution and other problems

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