The prestressing introduction device null in the large span construction

摘要

PURPOSE:To prevent the deformation of a member by constructing a ridge- shaped large-span frame body with strut materials, ball joints and bolt-shaped connectors, and introducing prestress in the span direction. CONSTITUTION:Multiple strut materials 4 are suspended below the ridge section of a large-span frame body 1, and strut materials 5 are suspended at the middle sections between the ridge section and support sections on both ends. Lower end sections of four strut materials 4 are connected with a ball joint 7, and a reverse square pyramid-shaped stereoscopic truss (a) is formed in the ridge direction of the large-span frame body 1. A base metal 11 is installed at the upper end section of a lower structure body 10, and a supporter 9 is installed on it. Tension materials 23 made of a PC steel wire are introduced in the span direction between the right and left supporters 9, strut materials 5, and ball joints 7 at the lower end of the stereoscopic truss (a). No bending force is generated, and positioning can be simply performed.