WIDENING DEVICE AND WIDENING METHOD FOR EXISTING TUNNEL

摘要

PROBLEM TO BE SOLVED: To provide a widening device and a widening method for existing tunnel that reduce costs by simplifying the device.;SOLUTION: The widening device includes a cylindrical device body 13 which can be moved forward in an entrance 11 installed on an inner wall of an existing tunnel 10 in a radial direction of the tunnel; a plurality of propulsion jacks 14 which are installed in the existing tunnel so as to move the device body forward; cutter support cylinders 17A, 17B which penetrate a partition wall 16 partitioning off the interior of the device body in a front-rear direction through seal devices 18A, 18B, are pivoted in an oscillatory state on both right and left parts of the device body behind the partition wall on sides which are a little before cylinder-axial-directional intermediate parts thereof, and can extend and contract; swing jacks 19A, 19B fitted to the device body behind the partition wall so as to allow the cutter support cylinders to oscillate; drum cutters 22A, 22B which are fitted to tip parts of the cutter support cylinders which are positioned before the partition wall; and a discharge conveyor 26 which has a suction opening 26a penetrating the partition wall, and takes excavation earth in from the interior of the device body before the partition wall.;COPYRIGHT: (C)2013,JPO&INPIT