| 摘要 |
PROBLEM TO BE SOLVED: To promote a hydration reaction of a grout material of a junction of precast concrete members.SOLUTION: When solidifying a grout material G of a joint part 50, a heater wire 60 (an inner heater wire 62 embedded in the joint part 50 and an outer heater wire 64 wound around the outside of an external edge 52 of the joint part 50) generates heat, and raises a temperature of the grout material G of the joint part 50. A hydration reaction of the grout material G is promoted by a rise of the temperature of the grout material G of the joint part 50. Similarly, when solidifying the grout material G of a hollow pipe 40, a heater wire 70 wound around the hollow pipe 40 and embedded therein generates heat, and raises the temperature of the grout material G of the hollow pipe 40. The hydration reaction of the grout material G is promoted by a rise of the temperature of the grout material G of the hollow pipe 40. Then, by the promotion of the hydration reaction of the grout material G, the rigidity of the grout material G is improved and a curing time is shortened. |
