| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a load bearing material which prevents buckling of a compressed material when compressed. SOLUTION: A compressive force is applied to a PC steel rod 3 arranged in a steel pipe 2, and a tensile force in a longitudinal direction of the steel pipe 2 is applied by an elastic restoration force in an extending direction of the PC steel rod 3. A filling material 31 is filled partly in a cross section of the inside of the steel pipe 2 to cover the PC steel rod 3 by the filling material 31 by using the unbonded PC steel rod 3. After the filling material 31 is cured, the PC steel rod 3 can be compressed by applying the compressive force to it without causing buckling of the PC steel rod 3. After the compression, the tensile force is introduced to the steel pipe 2 by the elastic restoration force of the PC steel rod 3, and the steel pipe 2 can be extended. COPYRIGHT: (C)2008,JPO&INPIT
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