| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a permeable-pipe laying construction method and a cutoff device used for the construction method, by which cutoff into a permeable pipe can be conducted surely during the execution of works and sure permeable performance can be obtained after the execution of works. SOLUTION: The laying construction method of the permeable pipe has the first process, in which a steel pipe in fixed length and the permeable pipe internally inserted into the steel pipe are connected successively by a pipe jacking machine and buried from a starting shaft to an arrival shaft, the second process, in which opening sections at the front ends of the steel pipe and the permeable pipe reaching the arrival shaft are cut off, and the third process, in which water is cut off between a pit wall and the steel pipe, between the steel pipe and the permeable pipe and in the permeable pipe on the starting shaft side and the steel pipe is pulled out and removed to the starting shaft side or the arrival shaft side. The laying construction method of the permeable pipe has a cylindrical body fixed at the end section of the permeable pipe, an outside cutoff means being installed onto the outer circumferential surface of the cylindrical body and cutting off a section between the steel pipe and the cylindrical body and an inside cutoff means being freely mounted and demounted to and from the inside of the cylindrical body and cutting off the inside of the cylindrical body.</p> |
