TUNNEL INVERT CONSTRUCTION METHOD AND PRECAST PLATE USING FOR TUNNEL INVERT

摘要

To prevent stress from concentrating at a connecting portion.SOLUTION: In a tunnel invert construction method in which the invert 5 made of concrete is provided at the bottom portion of the tunnel 1, a plurality of precast plates 6, 7 having a shape obtained by dividing the invert 5 in the width direction other than the center in the width direction of the invert 5 is formed, and the plurality of precast plates 6, 7 is installed with being connected each other in the portion except the center in the width direction of the tunnel 1. As the invert 5 of the tunnel 1, the excellent invert 5 in strength can be constructed by dividing at the position except the center in the width direction so that the bending moment is maximized. Also, since the connection points K, K between the precast plates 6, 7 adjacent in the width direction are different in the precast plates 6, 7 adjacent in the length direction of the tunnel 1, as the connection points K, K are not continuous in the tunnel length direction, stress concentration on the connection points K, K can be avoided.SELECTED DRAWING: Figure 1