US 12,258,864 B2
Tunnel excavation device
Masahiro Suwano, Tokyo (JP); Naoki Sekiyama, Tokyo (JP); Hiroshi Asano, Tokyo (JP); and Taku Arakawa, Tokyo (JP)
Assigned to KOMATSU LTD., Tokyo (JP)
Appl. No. 17/923,635
Filed by KOMATSU LTD., Tokyo (JP)
PCT Filed Apr. 22, 2021, PCT No. PCT/JP2021/016324
§ 371(c)(1), (2) Date Nov. 7, 2022,
PCT Pub. No. WO2021/230034, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2020-083822 (JP), filed on May 12, 2020.
Prior Publication US 2023/0203949 A1, Jun. 29, 2023
Int. Cl. E21D 9/10 (2006.01); E21D 9/11 (2006.01); E21D 11/40 (2006.01)
CPC E21D 9/112 (2013.01) [E21D 9/1093 (2013.01); E21D 11/40 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A tunnel excavation device comprising:
a main body including
a front body section including a cutter head provided with a plurality of cutters and
a rear body section including a gripper section for obtaining a reaction force during excavation, the rear body section being disposed behind the front body section;
a frame disposed behind the main body, the frame being connected to the main body; and
a workbench disposed above the frame so as to be rotatable with respect to the frame, the workbench including
a work deck, and
a boom supporting the work deck on the frame,
the work deck being rotatable with respect to the frame with at least two
different rotation radii.