TUNNEL EXCAVATOR

PURPOSE:To execute tunnel construction by one excavator by installing a folding type scaffold and a concrete sprayer onto the boom of the tunnel excavator with a cutter supported to the boom and muck shifter. CONSTITUTION:When a facing is excavated by driving a cutter 25 and excavation in a fixed section and the carrying-out of much are completed, booms 24 are held horizontally by hydraulic cylinders 28, and a scaffold 12 on the booms 24 is moved to the position of operation. Developing sections 12B are developed to the outside, handrails 13 are mounted, and timberings are assembled by using the scaffold 12 to which a chain 14 is connected. A hydraulic cylinder 9 is shrunk, an injection nozzle 2 is rotated to the position of usage, and the injection nozzle is directed toward each direction and ready-mixed concrete is sprayed against the wall surface of a tunnel. Rock bolts are driven to bedrock from the upper section of the scaffold 12. Accordingly, various work with tunnel construction can be executed by one excavator.