| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the work of extending a duct along with tunnel excavation while achieving simple equipment constitution.SOLUTION: Ventilation equipment comprises a duct which is connectable and disconnectable and which extends from the pit mouth side to the working face side, and a replenishing duct 2 extensible in a longer direction. In the equipment, connection of ducts 3 and 3 is disconnected and the replenishing duct 2 is interposed between the separated ducts 3 and 3 in a compressed state, and the replenishing duct in a compressed state is extended to the working face side by moving means 7, and the duct is supplied with the replenishing duct along with tunnel excavation so as to extend the length of the duct.SELECTED DRAWING: Figure 8 |
