The punch which reaches to ground in the side wall of the earthquake-proof additional strength construction method null (a) structure of the structure which touches with the ground which uses

摘要

PROBLEM TO BE SOLVED: To provide a tip expansion anchor with bucked steel bar branches for aseismatic reinforcement, the tip expansion anchor that exerts a holding force onto a surface on the ground side of a structure in contact with the ground by the anchor reaching the ground, the structure that cannot be reinforced by a steel plate, thereby reinforcing a side wall of the structure; and provide an aseismatic reinforcing method for a structure in contact with ground.SOLUTION: A side wall 2 is firmly fixed onto the ground 1 by the steps of: forming a bore hole 4 that reaches the ground 1 in the side wall 2; plugging the bore hole 4 with a buckled reinforcement steel bar branch tip expansion anchor 5 that includes a hollow rod 7 and an expandable tip part; forming the expanded tip part by applying a tensile load at the rear end of the hollow rod 7 to cause expandable steel bar branches 6 arranged on the tip side of the hollow rod 7 to buckle and expand at a predetermined angle around the tip part of the hollow rod 7 as center, and anchor the steel bar branches 6 on the ground-side surface 2B of the side wall 2; filling the expanded tip part with cement 12 from the surface 2A of the side wall 2 via the internal hole of the hollow rod 7 to form a steel bar/cement expanded part 13; and installing a side wall reinforcement steel plate 14 and a nut 16 to firmly fix the side wall 2 onto the ground 1.