SPACER FOR CURVE PIPE-JACKING METHOD FOR PROPULSIVE PIPE

摘要

PROBLEM TO BE SOLVED: To simplify the structure of a spacer preventing the concentration of pipe-jacking stress generated on a pipe end-face in a curve pipe-jacking section.;SOLUTION: In the spacer 13 interposed to thrust transmission sections among the end faces of one pipes 1 pipe-jacked along a curved passage in case of the laying of pipe line and the end faces of the other pipes 1, the spacer is formed in one-piece ring bodies having approximately the same diameter as the pipes by curving and forming beltlike plates in a ring shape. Edges at one ends in the axial direction of one-piece ring bodies 14 formed in approximately the same diameter as the pipes 1 of the ring bodies are formed in edges brought into contact with surfaces orthogonal to an axis, edges 19 at the other ends in the axial direction are formed so as to have broad sections 16 and narrow sections 15 in widths in the axial direction with one ends, and the broad sections 16 and the narrow sections 15 are continued by smooth lines, and formed in a symmetrical shape, using diametral lines as boundaries.;COPYRIGHT: (C)2003,JPO