PIER FOR TUNNEL WORK, INVERT EXECUTION METHOD, AND TUNNEL CONSTRUCTION METHOD

摘要

PURPOSE: To prevent the progress of an excavation at a working face section from stagnating at the time of invert execution. ;CONSTITUTION: A mobile pier 9 is suspended between the bottom face 1b of an upper half section 6 and the bottom face 1b of a lower half section 7 in a tunnel 1. The mobile pier 9 is provided with a rock drill device 23 and a spray device 24 on the lower face of a frame 10, and the devices 23, 24 are arranged movably in the longitudinal direction of the mobile pier 9 along a traveling rail provided on the lower face of the frame 10. The rock drill device 23 is provided with an excavating boom 26, and the spray device 24 is provided with a spraying boom 28. The lock bolt execution of the excavated lower half section 7, the concrete spraying work, and the invert execution are performed below the mobile pier 9. The rock drilling work for the lock bolt execution of the excavated lower half section 7 is performed by the rock drill device 23, and the concrete spraying work is performed by a spraying device 24. Invert concrete is placed after the work.;COPYRIGHT: (C)1994,JPO