| 摘要 |
PROBLEM TO BE SOLVED: To provide an earthquake resistant pipe provided with a joint capable of displacement even to the contraction side of a pipe axis and suitable for a pipe-jacking method. SOLUTION: A double tube is formed of an outer pipe 1 of a reinforced concrete pipe and an inner pipe 3 made of a ductile casting pipe positioned in the same axis as the outer pipe 1 by an annular filling layer slidably fitted in the inner peripheral face, the end face of an outer pipe insertion opening 11 is flush with the end face of an inner pipe receiving opening 31, pipe jacking force between a preceding pipe and a subsequent pipe is transmitted only through the outer pipes, with regard to joining between the receiving opening 31 and the insertion opening 32 of the inner pipes 3, even after pipe path formation by a pipe jacking method, a contraction allowable amount between the insertion opening projection 33 of the tip end and the stepped face 34A of the deepest part of a preceding inner pipe receiving opening 31, and an expansion allowable amount between the insertion opening projection 33 and the preceding inner pipe receiving opening projection 35A are maintained respectively, thus the problem is dissolved by making earthquake resistant structure provided with expandability, separation prevention property and flexibility.
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