| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a PC steel 10 capable of preventing damage to a sheath 2, even when being bent in an arc shape for construction. <P>SOLUTION: An unbonded PC steel comprises PC steel wires 1 and a polyethylene sheath 2 covering the surroundings of the PC steel wires 1 via grease 3. The sheath 2 has high strength of tensile strength equal to or more than 29 MPa. The highly elastic sheath 2 cannot be damaged if it is bent for construction, which also prevents leakage of the grease 3. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
