To perform a reinforcing work for structure without the need of load replacement by manually inserting through a small diameter hand hole a threaded shaft, first and second connecting arms, travelling body and a welding torch, assembling them inside the structure, and carrying out welding by an external handle operation.
A threaded shaft 3, to which a fixing parts 4 and the first connecting arm 6 are attached, is inserted from a hand hole 2 into a structure 1 and fixed at a prescribed position on the side panel 1a, 1b of the structure 1. Then, with the lower part of the second connecting arm 6' attached to a travelling body 8, the first connecting arms 6 is connected to the second 6'. The threaded shaft 3 is rotated by operating a handle 5, moving the travelling body forward, and positioning the welding torch 13 at the corner part. With the switch of the power source turned on, and after the ignition of an arc for the welding wire at the tip end of the welding torch, the handle 5 is rotated, performing fillet welding while the welding torch 13 is advanced to the center in the near side. Hence, there is no need of reinforcement of the load replacement for an existing structure.
TAKAHATA SEIJI
YOMO ATSUO
IKEDA TOSHIJI
