| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate construction in a field and to surely expand/shrink an insert in movement of the ground due to an earthquake and the like. SOLUTION: In this pipe jacking method, the insert 1 of a precedent pipe P is inserted into a socket 2 of the precedent pipe P to connect the pipes P together for newly arranging a pipeline inside a sleeve pipe P'. The pipe joint structure can be moved within a predetermined length range on condition that the insert 1 is not pulled off from the socket 2 within this range. In the outer circumference of the insert 1, a jacking force transmitting material 14 having strength for transmitting a jacking force is arranged between a forcibly fixed saddle-shaped flange 20 and the socket 2. In jacking, the tip of the insert 1 is positioned in the middle of the predetermined movement-allowable length to be driven. If a great compression force is applied in the case of an earthquake and the like, expansion/shrinkage of the insert 1 to the socket 2 is allowed by shrinkage/breakage. The flange 20 is forcibly fixed to the insert outer circumferential face by means of fastening force on the split face, and consequently, installation can be carried out easily in a field. Workability is improved as an fastening force above a predetermined value is applicable (without any high limitation).</p> |
