Top-down system of pipe-jacking working well wall in soft soil area and construction method and application thereof

Abstract

The invention provides a top-down system of a pipe-jacking working well wall in a soft soil area and a construction method and an application thereof. The top-down system of the pipe-jacking working well wall in the soft soil area comprises an annular guide wall, a waterproof curtain, a bottom rigid-flexible combined pile, a connecting ring beam, a well wall reinforcement cage and an inner wall formwork, wherein the annular guide wall is arranged at the periphery of a pipe-jacking working well. The construction method comprises the following steps of (1) constructing the annular guide wall; (2) constructing the waterproof curtain; (3) constructing the bottom rigid-flexible composite pile (inserting H-shaped steel); (4) constructing the connecting ring beam; (5) digging soil in the core ofthe well; (6) binding and welding the well wall cage; (7) hanging the inner wall formwork; (8) pouring well wall concrete, removing the inner wall formwork after the concrete is hardened to a certaindegree, so that the construction of a part of well wall is completed, and preparing for the construction of the adjacent well wall of the lower part; and (9) repeating the steps (5) to (8) until the top-down construction of the pipe-jacking working well wall is completed. The whole construction method has the advantages of good structural impermeability, large rigidity, the simple structure, easiness and convenience in construction and short construction period.

Description

technical field [0001] The invention relates to the technical field of pipe-jacking well construction, in particular to a pipe-jacking well wall inversion system in soft soil areas, a construction method and an application thereof. Background technique [0002] Pipe jacking construction technology is an underground pipeline construction method developed after shield tunneling technology, and is widely used in trenchless laying of various pipelines such as urban underground water supply and drainage pipelines, natural gas and oil pipelines, and communication cables. Adopting this technology for construction can save a large amount of land acquisition and demolition costs, reduce environmental pollution and road blockage, and have significant economic and social benefits. In the pipe jacking construction technology, the construction of the working well is an indispensable link, and this process directly affects the progress and cost of the overall construction project. [000...

AI Technical Summary

Problems solved by technology

The caisson method is to excavate the soil in the well, rely on its own gravity to overcome the friction of the well wall and then sink to the design elevation, but this method requires high construction technology and a long construction period, and quicksand is prone to cause the caisson to tilt or sink during construction. Difficulty and other issues

The upside-down method refers to the method of excavating and constructing the structure from top to bottom without erecting temporary supports for the excavated pits, but using the mechanism itself as a retaining wall and as a support at the same time as the support during the construction of the underground structure. Construction method, but when constructing the structure and pouring the well wall, it is necessary to bind steel bars, set formwork and formwork support, and the steel bar binding process is limited by the construction space, which is time-consuming and laborious. The formwork support generally adopts a simple wooden structure. The support effect of this method is limited, and it is prone to mold explosion and expansion, and it occupies the limited construction space in the well and affects the construction of other processes.

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