| 摘要 |
A construction method has gas or water supply conduit buried in the ground and internally lined (internal lining) with a tube advanced within the conduit while being reversed by means of fluid pressure. The whole of lining operation is performed at a part of the conduit appearing on the ground. First, a distance from the entrance of the conduit to the service tee through the conduit is measured and a tube for lining is reversed after cut to a length slightly longer than the length thus measured. As a result, a non-reversed part of the tube in short length is left in the conduit on the side of the forward end of the tube. The non-reversed part can be utilized when an unwinding tape tied to the tube is cut by a cutter inserted into the conduit. After reversing the lining tube, a warming tube is similarly reversed and warm water hose for internal circulation of warm water is inserted into the warming tube so that the conduit is internally lined with said lining tube over which thermosetting adhesive has been spread. After completion of internal lining, the warm water hose is pulled out, the warming tube is then pulled out with the unwinding tape pulled, and the unwinding tape of the lining tube is cut to be recovered. As the last step, a fusing head is inserted into the conduit for melt-opening the tip of the lining tube for fluid passage and the fusing head is pulled out. |
