Method of introducing prestress into cast-in-place concrete

摘要

PROBLEM TO BE SOLVED: To dispose a precast concrete member (hereinafter, a pc member) in which a tendon is arranged inside thereof and whose end projects from an end surface between support members adjacent to each other, and then introduce prestress to the concrete at the joining part utilizing an end of the tendon buried in the concrete at the joining part installed in situ on the support member without using a jack on the support member.SOLUTION: An end surface side end part 32 of a tendon 3 which projects from an axial end surface of a PC member 1 is overlapped on a fixing plate 5 of the PC member 1 while a tension is applied to the tendon 3, and fixed to a fixed member 6 having a space forming material 60 forming a closed space which is to be filled with a powder and granular material 62 using a fixing tool 7. Also, the closed space is filled with the powder and granular material 62, and the movement of the fixing tool 7 to the side of the fixing plate 5 is restricted using the fixed member 6. After the strength of a joining part concrete 4 is made apparent, the powder and granular material 62 is discharged from the closed space, and the fixed member 6 is constricted to move the fixing tool 7 to the side of the fixing plate 5, thereby introducing prestress to the joining part concrete 4.SELECTED DRAWING: Figure 1