| 摘要 |
PROBLEM TO BE SOLVED: To ensure mounting spaces of various devices at the rears of driving shafts for a cutter frame by installing a shaft section at a central section and a cylindrical section on the outer circumferential side as the driving shafts, connecting the shaft section and the cylindrical section by a flange section and constituting a shield machine and mounting a large-diameter bearing to the cylindrical section. SOLUTION: A center shaft 2 is arranged onto the central axis of a shield machine body 1, and a cutter frame 3 is cantilever-fixed to a front end section. The center shaft 2 is formed in a solid shape, and a shaft section 2a along the central axis and a circumferential section 2b are connected by a flange 2c. An external surface on the chamber 5 side of the flange section 2c and the external surface of the shaft section 2a are formed in a smoothly continuous curved shape. Chemical injection holes 7 are formed between the shaft section 2a and the flange section 2c, and chemical injection devices 8 are set up. A pinion 11 is engaged with a ring gear 9 consisting of the internal gears of the cylindrical section 2b, and driven by a motor 10. The center shaft 2 is supported to a cutter head support 13 through a large-diameter bearing 12 at the place of the ring gear 9, and a space is ensured at the rear of the shaft section 2a. |
