| 摘要 |
PURPOSE:To contrive the facilitation of a direction control preventing groundwater or the like from its inflow into a pit further a backfilling material from deteriorating its simultaneous injection by respectively providing a packing device in a partitioning plate, provided in a skin plate, and a check valve in a backfilling injection pipe. CONSTITUTION:A packing device, comprising a hydraulic jack 16 and a gland packing 19, is mounted to an annular partitioning plate 15 provided being arranged before a tail packing 2. While a check valve 13 is mounted to a backfilling injection pipe 12 in its point end part extending to the rear penetrating through the tail packing 2 mounted to a rear tail of a skin plate 1. When a shield machine advances digging the ground, the packing device forces the packing 19 to be press mounted to the peripheral surface of a segment 14, water-tightly calking a clearance between the skin plate 1 and the segment 14, and an inflow of groundwater and muddy water into the inside of the backfilling injection pipe 12 is inhibited. |
