MULTI-TUBE DIVERGING SHIELD MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a multi-tube diverging shield machine which includes a rectangular excavator and circular excavators in a manner being divergeable therefrom, and can excavate an envelope cross-sectional area of each excavator. SOLUTION: The multi-tube diverging shield machine is comprised of the rectangular excavator 2, the circular excavators 3 adjacently arranged on both sides of the rectangular excavator 2, and an outer shell member 5 housing the circular excavators 3 therein in a frontward movable manner and having the rectangular excavator 2 connected thereto in a manner being divergeable therefrom. The external shell member 5 has an external shell 5a which extends along peripheral surfaces of the circular excavators 3 and has its both ends 17 reach an upper end and a lower end of the rectangular excavator 2. Further, the excavators 2 and 3 each have a main cutter disk 4, and a rocking cutters 9 for excavating areas which are not excavated by the main cutter disks 4 are arranged on a front surface of the rectangular excavator 2 at locations outside the main cutter disk 4.