| 摘要 |
PROBLEM TO BE SOLVED: To provide a lamination type method for manufacturing a PC panel which prevents occurrence of an initial freezing damage in the winter season or the like and enables attainment of a sufficient concrete strength. SOLUTION: After concrete C is placed in a form 1, a vacuum mat 5 is laid on the concrete C and a vacuum suction hose 7 is connected thereto so as to conduct an operation of sucking bleeding water on the surface of the concrete. After the sucking operation is completed, the vacuum mat 5 is removed, an insulating material 10 having an electric heater 12 incorporated is laid and the electric heater 12 is made to heat so as to ensure the shape retention of a PC panel. With the insulating material 10 left on the PC panel of which the shape retention is ensured, each of the aforesaid processes of placing the concrete, laying the vacuum mat, laying the insulating material and ensuring the shape retention is repeated sequentially and thereby a plurality of PC panels are manufactured in lamination in the same form material 1. The concrete is cured by heating by leaving the electric heater 12 heating also after the shape retention is attained, so as to ensure the concrete strength of the PC panel and to improve the speed of production. |
