| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method of pipe laying work capable of restoring superannuated existing sewerage pipes including a grade of natural flow by using a pipe-in-pipe method. SOLUTION: Inner pipes are each provided with a height adjuster, a height fixer, and wheels, and disposed in an opening part for work. The inner pipes are successively connected one to another and inserted into an existing pipeline by means of inner-pipe insertion auxiliaries. The auxiliaries can be fixed to fore-and-aft adjoining inner pipes each time a prescribed number of inner pipes A are together connected, and can be removed from inside the inner pipes. The next inner pipes are inserted by means of the removed auxiliaries, and this is repeated. When the inserted inner pipes reach another opening part for work, the insertion of the inner pipes is stopped, the first inserted auxiliaries are removed, the height of inner pipes on the deeper side of the removed auxiliaries is adjusted and then fixed. Partitions are provided in gaps between the inner pipes and the existing pipes, and a filler is pressed into space on the deeper side of the partitions. After the filler has hardened, the inner pipes are further inserted by the lengths of the auxiliaries, and adjoining inner pipes are connected to each other.</p> |
