| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent a blockage by a foreign matter of a check valve, and to pour out a pure grout at all times when the shield machine side is supplied with the grout such as slurry through a pipeline piped in a tunnel and slurry is poured out to a facing or the like from the front end section of the pipeline through the check valve. SOLUTION: A piping section for extending pipes extending the standard-size pipes on the rear end side of a shield machine with pipe jacking is installed into the grout feed pipeline while a single pipe in which a filter capturing foreign matters in the pipeline is finished interiorly is interposed detachably between the piping section for extending the pipes and the check valve disposed at the rear section of an injection hole facing the facing or the like from the inside of the shield machine, the foreign matters mixed into the grout flowing in the pipeline are captured by the filter in the single pipe, and the check valve side is supplied with the purified grout. |
