A construction method of surface contact pipe curtain structure

Abstract

The invention discloses a novel surface contact pipe curtain structure and a construction method thereof. The pipe curtain structure serves as the forepoling structure of a tunnel and is formed by splicing rectangular steel tubes or similar rectangular steel tubes, wherein each rectangular steel tube contains two or more contact surfaces, and surface contact is formed between each steel tube and the adjacent steel tube; each steel tube contains two or more contact surfaces, and the contact surfaces of each steel tube are in seamless attachment to the contact planes of the corresponding adjacent steel tubes; the dimensions of two contact planes which are in contact with each other are adapted to each other; a slide rail is welded to each of the two long edges of the outer wall surface of each steel tube along one of the contact planes, and every two adjacent steel tubes are fixedly connected through the corresponding slide rail. The novel surface contact pipe curtain structure is different from a traditional circular tube curtain structure, the rectangular or similar rectangular steel tubes are adopted, the novel surface contact pipe curtain structure has the advantages of being convenient to splice, great in structure stress, good in forepoling effect and the like, an extension type excavation expanding drill is used in the construction process, the cutting blind area problem of a non-circular steel tube drill bit is solved, and the difficult problem of cleaning residual soil in the tubes is effectively solved through high pressure water or high pressure blast.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for a surface-contact pipe curtain structure. Background technique [0002] At present, there is less and less developable space on the ground, and the development of underground space is an inevitable trend of international metropolises. The construction of large underground spaces such as subways and stations generally adopts underground excavation. The pipe curtain construction method is a new type of underground excavation technology. It is a construction method for constructing large-span section underground excavation projects on the basis of small-diameter steel pipe densely packed support. It is especially suitable for urban buildings with dense buildings and ground traffic. It has obvious advantages in busy road sections, passing through existing important structures and buildings, ultra-shallow buried and ultra-large cross-section tunnel projects...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a construction method for the surface-contact pipe curtain structure, which solves the problems of uneven stress and difficult control of construction precision of the current round pipe pipe curtain structure; at the same time, it introduces the construction method and effectively solves the problem of Difficulties of soil removal inside non-circular pipes

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