Re-tension method of the existing anchor, jig and re-tension member combined anchor head for anchor re-tension

摘要

PROBLEM TO BE SOLVED: To re-tense an existing anchor without using a center hole jack and complicating construction and to improve adaptability to a current anchor head.;SOLUTION: A supporting head 32 having through-holes 34 as screw holes at three spaced places is fixedly connected to the existing anchor head 22 so as to be movable to at least a pull direction integrally with a tensile material 18 as a re-tensing member. A series of tension bolts 16 are inserted and threaded into the through-holes 34 of the supporting head 32 through the terminal end of the tensile material 18. The re-tension of the tensile material is performed with the axial movement of the supporting head in the pull direction following the threading of the tension bolts into the through-holes.;COPYRIGHT: (C)2006,JPO&NCIPI