| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for driving a thermal insulating material, etc., into a perforated PC board by which there exists no possibility of decreasing thermal insulation and sound absorbing effects and appearance of a product. SOLUTION: When the perforated PC board A manufactured as a pre- tensioning prestressed material is to be manufactured by placing a concrete on a long line bed 1 in a continuous length and the thermal insulating material and a sound absorbing material 4 is to be placed, by placing the thermal insulating material and the sound absorbing material 4 on the long line bed 1 before the concrete is placed and holding the surroundings of the placed thermal insulating material and the sound absorbing material 4 with a joint compound 5 fixed and arranged on the long line bed 1, the thermal insulating material and the sound absorbing material 4 and prevented from being moved when the concrete is placed and concrete ingredients and cutting water containing cuttings when cutting is performed are prevented from creeping to the surfaces of the thermal insulating material and the sound absorbing material 4.
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