METHOD FOR BUILDING ARCH BRIDGE AND BEARING FOR ARCH BRIDGE

摘要

PROBLEM TO BE SOLVED: To rotate an arch rib under a stable state up to a fixed place in a method for erecting an arch bridge by a lowering type, and to simplify the installation works of a rotary bearing used for the lowering type.;SOLUTION: A half arch 17 is erected upwards on the rotary bearing 16 installed on an arch abutment 11, and a half arch is borne by a primary cable 20, in which one end is engaged with an anchor 15, and an extrusion jack 12. The half arch is borne by the primary cable having a small sectional area at an initial stage when the half arch is turned up to the fixed place, and is borne by a secondary cable 19 having a large sectional area and revolved up to the fixed place. A plurality of upper shoe stones and lower shoe stones are arrayed in the cross direction of the arch rib in the rotary bearing bearing the half arch, and a rotating shaft rotatably connecting the upper shoe stones and the lower shoe stones is formed in a continuous one member extensively over a plurality of the shoe stones. The undersides of the lower shoe stones have inclined bearing sections and horizontal bearing sections.;COPYRIGHT: (C)2004,JPO