CUTTER HEAD FOR SHIELD MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a cuter head for a shield machine capable of switching a disc cutter between a cutting position and a water cut-off position by means of a compact structure and safely and easily replacing the disc cutter from a cutter head spoke inside without performing any soil improvement for reducing a cost and a construction period. SOLUTION: This cutter head is provided with a disc cutter mounting box 21 and a disc cutter cover 22 pivoted to the disc cutter mounting box 21 for supporting the disc cutter rotationally. The bottom part of the disc cutter mounting box 21 is constructed so that it can be freely opened/closed by detaching/ attaching a bolt 31 and can be switched between the cutting position for performing cutting and the water cut-off position for sealing water by means of the disc cutter cover 22 when a pivot shaft 22a is turned. In selection of the water cut-off position, the disc cutter 13 can be replaced from the inside of the cutter head spoke 11.