| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint structure, capable of improving the efficiency of propulsion construction method using an aseismatic propulsion pipe, and preventing the pipe and an inner surface coating from being damaged when compressive force and tensile force are applied in the axial direction of the pipe due to an earthquake after piping. SOLUTION: A thrust transmitting ring 5 is fitted to a propulsion ring 4 through a first engagement part of a first groove 4A and a projecting part 5A. A spigot 2 of a rear pipe 1A is inserted in a socket 3 of a preceding pipe 1B, and both pipes are connected with the end face of the thrust transmitting ring 5 abutting on the side end face 3A of an opening part. In the connected state, the driving force is transmitted to form a conduit. The first engagement part has a snap effect so that although it is not disengaged by the driving force in a jacking work for a pipe 1, when large force is applied in the compressing direction of the joint due to an earthquake or the like, the engagement is disengaged. When the compressive force exceeding the regulated force is applied due to an earthquake or the like, the first engagement part is disengaged, and the force of the earthquake is released by contraction performance exhibited in the joint. COPYRIGHT: (C)2003,JPO
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