EDGE WIDTH EXPANDING STRUCTURE OF EXISTING LOWER PART STRUCTURE BY PRECAST BLOCK AND ITS CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an edge width expanding structure of an existing lower part structure, and its construction method, superior in workability at a job site, and shortening a construction period.;SOLUTION: This existing lower part structure 1 has a beam support upper surface 3, by arranging a plurality of anchor horizontal holes 2 at an interval in the horizontal direction; and is constituted so that a precast concrete block 5 with a beam support part having a hollow PC steel bar inserting horizontal through-hole 4 is arranged in a side part. This existing lower part structure 1 is balanced by pushing a pushing-in reaction PC steel bar 7 inside a hollow PC steel bar 6 over the anchor horizontal holes 2 and the horizontal through-hole 4, and a prestress force introducing device 8 having the pre-tensioned hollow PC steel bar 6 is inserted. This existing lower part structure 1 is attached with the block 5, by introducing tensional force into the hollow PC steel bar 6, by filling and hardening non-shrinking mortar 9 between the respective anchor horizontal holes 2, the horizontal through-hole 4 and the block 5.;COPYRIGHT: (C)2005,JPO&NCIPI