METHOD FOR PREVENTING SETTLEMENT OF VIADUCT

PROBLEM TO BE SOLVED: To prevent the settlement of a viaduct while performing the load receiving replacement of the viaduct without depending on a conventional underpinning method. SOLUTION: In the method for preventing the settlement of the viaduct, a reaction slab is installed on the ground near a pedestal of a bridge pier constituting the substructure of the viaduct, and a temporary receiving mechanism is installed on the reaction slab. The bridge pier is surrounded by a post reinforcing member covering at least a part of a predetermined position where the bridge pier is horizontally cut. An upper part above the cutting predetermined position of the bridge pier, and the post reinforcing member positioned at the upper part, are fixed to the temporary receiving mechanism. After controlling the drive of the temporary receiving mechanism so that vertical load from the viaduct flows to the reaction slab through the temporary receiving mechanism, the bridge pier is cut in the cutting predetermined position, and while performing the construction work of an underground structure in this state, the drive of the temporary receiving mechanism is controlled in response to the settlement under construction. The cut upper part of the bridge pier is thereby lifted relatively to the reaction slab to keep the absolute height of the viaduct constant. COPYRIGHT: (C)2005,JPO&NCIPI