To separate an extension conveyor from a work carrier such as arch center to remove influence due to swing of the work carrier and simplify support change work of the conveyor accompanying travel of the work carrier to constitute the whole device inexpensively in a compact manner in tunnel construction work facility.
The arch center 1 is installed on a floor rail 4 of a tunnel, and the extension conveyor 2 for mucking is supported by a supporting device 3 in an installation section of the arch center 1. The supporting device 3 is composed of a front leg 13 positioned on a facing side more than the arch center 1, a rear leg 14 positioned on a pit mouth side more than the arch center 1, and a support beam 15 stretched between upper ends of the front leg 13 and the rear leg 14 and having a truss structure. The front leg 13 and the rear leg 14 are provided with a wheel 16 supported on a tunnel floor surface and motors 17, 18 for running for driving the wheel 16. A roller supporting the extension conveyor 2 and a guide for correcting meandering of the conveyor 2 are arranged in a bottom part of the support beam 15.
NAGATA KENICHIRO
YASUDA HIROAKI
DAIEI KOKI KK