SHIELD MACHINE, AND TUNNEL EXECUTION METHOD THEREBY

摘要

PROBLEM TO BE SOLVED: To provide an execution method capable of easily changing the curvature by arranging a specified number of excavating and advancing machine bodies adjacent to each other while deviating them from one another in the longitudinal direction successively from one side to adjust the thrust of respectively provided propulsion jacks. SOLUTION: Cutter heads 1A-1C are provided adjacent to each other on a tip part of first to third excavating and advancing machine bodies 2A-2C of different length in a shield machine 1. The cutter heads 1A-1C are arranged at the position successively deviated backward by the difference in length of the first to third excavating and advancing machine bodies 2A-2C, and propulsion jacks 3-5 are arranged on the circumference with specified intervals. An auxiliary blade 6 to be advanced/retracted to/from the ground G side at a specified angleαis provided on a side part of the third excavating and advancing machine body 2C. A curved tunnel of different curvature can be executed while keeping a specified propulsion force by adjusting the propulsion force of the propulsion jacks 3-5, and the curvature can be easily changed. The smooth execution can be effected by projecting the auxiliary blade 6.