| 摘要 |
<P>PROBLEM TO BE SOLVED: To effectively restrain a reduction of tensile force in a tendon due to frictional loss. <P>SOLUTION: In a pre-stress introduction method, portions of PC steel wires 132 and 134 are vibrated in order to reduce friction resistance between the vibrated portions of PC steel wires 132 and 134 and inner peripheral surfaces of insertion holes 118 and 120 which contact with the vibrated portions of PC steel wires 132 and 134. A reduction of tensile force in the PC steel wires 132 and 134 due to frictional loss is restrained by applying tensile force to the PC steel wires 132 and 134 by a tension jack 136 in a state where the friction resistance is reduced. That is, the pre-stress introduction method enables tensile stress in the PC steel wires 132 and 134 to be larger than a method without vibrating the same and thereby increasing pre-stress to be introduced to a tower-like structure 100. <P>COPYRIGHT: (C)2013,JPO&INPIT |
