Method of introducing pre-stress to cast-in-place concrete

摘要

PROBLEM TO BE SOLVED: To install a precast concrete member having a tension material arranged therein with the end section protruded from an end surface between adjacent support members, and thereafter to introduce a pre-stress to junction concrete placed on a job site on the support members by using the tension material buried in the junction concrete.SOLUTION: An end surface side edge part 32 of a tension material 3 protruded from an end surface in an axial direction of a pre-cast concrete member 1 is fixed to a fixing plate 5 or a fixed material 6 of the pre-cast concrete member 1 by using a fixture 7 in a state that a tensile force is applied to the tension material 3, and the movement of the fixture 7 to the fixing plate 5 side is constrained by using the fixed material 6, and after junction concrete 4 reveals strength, the constraint of the fixture 7 by the fixed material 6 is released to generate the movement of the fixture 7 to the fixing plate 5 side, and a pre-stress is introduced to the junction concrete 4.SELECTED DRAWING: Figure 1