A reinforcement butt stud welding method and a device therefore, capable of butt-welding
a stud reinforcing bar coaxially to the end portion of a horizontally-laid existing
reinforcement in a small work space; and a repairing/expanding method for a ferroconcrete
structure. The reinforcement butt stud welding method includes the steps of fitting
an earth clamp over the periphery of the end portion of the existing reinforcement,
fitting an annular stud base that is a heat-resisting, insulating material to the
conductor surface of the earth clamp by being pressed against the conductor surface,
bringing the tip end of a stud reinforcing bar, loaded in a stud welding gun, into
contact with the end face of the existing reinforcement, and keeping a ferrule
disposed around the tip end portion of the stud reinforcing bar joined to the stud
base to complete stud welding.
