Buffer material for pipe jacking and pipe jacking

Abstract

Provided is a jacking pipe cushioning material that exhibits a superior stress-dispersion effect and is easy to position. The jacking pipe cushioning material (20) (cushioning material pieces (20a)) is a ring-shaped plate member comprising a first side surface (21) and a second side surface (22), which are disposed so as to be substantially parallel at a prescribed distance (s) from one another, as well as an outer peripheral surface (25) positioned at the outer peripheral edges of both side surfaces. If the diameter (radius of curvature) from the center (L) of the ring to the outer circumferential edge (23) of the first side surface (21) is represented by A, the diameter (radius of curvature) to the outer circumferential edge (24) of the second side surface (22) is represented by B, and the diameter (radius of curvature) to an arbitrary position along the axial direction of the outer circumferential surface (25) is represented by C, then A = B and A > C.

Description

technical field [0001] The present invention relates to a pipe jacking buffer material used for joints of pipe jacking (pipe jacking) in a pipe jacking method and a pipe jacking material having the buffer material. Background technique [0002] The pipe-jacking method is widely used as a construction method for laying pipes underground, such as public sewerage works. The pipe jacking method is a construction method in which pipes are buried underground by, for example, sequentially pushing out concrete pipes underground without excavating the entire range of buried pipes. Hereinafter, in this specification, the above-mentioned buried pipe is referred to as a "jack pipe". [0003] Among the pipe jacking methods used in the pipe jacking method described above, concrete, resin concrete, pottery, and iron pipe jacking pipes are often used as materials. Therefore, when the ejector pipes are pushed out, if the ejector pipes come into contact with each other, the contacted parts ...

AI Technical Summary

Problems solved by technology

As a result, the cushioning performance is reduced compared to a cushioning material that is in contact with the entire end surface of the jacking pipe and exhibits high stress dispersion.

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