| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To smoothly perform blocking work of a start shaft side end of a sheath pipe. <P>SOLUTION: A construction method for pipe-jacking by letting a new pipe 2 float by buoyancy is adopted, and only a cap 30 is first fitted into the sheath pipe 1 to block the start shaft side end of the sheath pipe at this time. When an arrival shaft side end of the sheath pipe 1 is blocked, a scope of selection of work for pouring a buoyancy material into the sheath pipe 1 is enlarged to improve work efficiency. When fitting a tip of the new pipe into the cap, the most leading new pipe is fitted while preventing insertion of the cap into the sheath pipe and then the new pipe is inserted into the sheath pipe together with the cap. Even if the cap is first fitted into the sheath pipe, fitting is not performed well if the cap is inserted into the sheath pipe. A divided-into-two ring 35 is adopted as an insertion prevention means of the cap into the sheath pipe 1, a screw is screwed into a screw hole around it, and its tip is abutted on an outer peripheral face of the cap to attach the ring 35 to the cap 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
