TUNNEL BORING MACHINE HAVING HOLDER TO REPLACE ROLLER CUTTER AND MAIN BIT

摘要

PURPOSE: A tunnel boring machine having a holder to replace a roller cutter and a main bit is provided to facilitate replacement, and improve boring capacity while a roller cutter and a main bit are suitably placed according to the type of a stratum. CONSTITUTION: Several exchange holders(10) are installed in the front side of a cutter head, and either of a roller cutter(131) or a main bit is installed in the exchange holder. The exchange holder comprises a holder block(12), a guide block(16), a fixing block(18) and a reaction block(20). The holder block passes through the cutter head. The front and rear sides of the holder block are opened. The guide block and the fixing block are installed in the front side of the holder block, and install the roller cutter(131) or the bit bracket having the main bit. The reaction block is installed in the rear side of the holder block.