VENTILATING METHOD FOR INSIDE OF PIPE IN METHOD OF TEMPORARY-PIPE PROPULSION CONSTRUCTION

PURPOSE:To ventilate intenal air of the guide pipe side continuously with fresh air on the starting shaft side by communicating a vent pipe into a temporary pipe buried into the ground in a series and sucking air from the starting shaft side. CONSTITUTION:Temporary pipes 1 are extended successively while being continued to a guide pipe with the excavation of the ground by the guide pipe from the starting shaft side. A small-diametral vent pipe 11 is disposed previously into the temporary pipe 1 under the state, in which the front and rear opening ends of the vent pipe 11 are penetrated to plates 2 fixed onto the front and rear opening end faces of the temporary pipe 1 and faced to the outside. When the mutual opposed end faces of the temporary pipes 1 are connected, the vent pipes 11 are communicated mutually, and vent pipes 11, in which the insides of the temporary pipes 1 successively buried into the ground are communicated in a series, are manufactured. Air is sucked from the starting shaft side, internal air on the guide pipe side is discharged while fresh air on the starting shaft side is flowed into the guide pipe side.