| 摘要 |
<p>PROBLEM TO BE SOLVED: To make relaying possible of an existing buried pipe to a new pipe by open cutting even when the other buried pipe is provided in an upper part. SOLUTION: A long scaled existing buried pipe 10 is cut into a plurality of short scaled unit existing buried pipes 10a, after an upper part of this existing buried pipe 10 is excavated in a groove shape, from on the ground, by a crane or the like, in each unit existing buried pipe 10a, it is hoisted from a space of the other buried pipe, to be removed. Thereafter, a plurality of short scaled unit new pipes are successively hung down in a groove from the space of the other buried pipe from on the ground, to be laid, after a long scaled new pipe is formed by connecting this unit new pipe, by burying back, the existing buried pipe is replaced by relaying with the new pipe.</p> |
