SITE WELDING METHOD OF EXISTING FOUNDATION PILE JOINT

摘要

PURPOSE:To perform sure welding under constant conditions and save manpower by letting the truck of the welding machine self-run along the peripheral surface of piles and welding one layer per rotation of the joint grooves of upper and lower piles through straight manipulation of electrode. CONSTITUTION:Convex flights 8 are provided around the travelling wheels 7 of the truck 6 of the welding machine nearly in the central part and these fit in the concave grooves 5 of pile side plates, causing the truck to run by itself. While the truck 6 of the welding machine is slewing, it builds up beads 14 in the groove 13 created by the circumferential edges of the overlapped end plates 3, 3 of an upper pile 1 and a lower pile 2. when it has made one turn, the build-up by the beads 14 is detected by a sensing means such as limit switch or the like, whereby the travelling and welding are stopped. In this way, the welding by bead one layer build-up without weaving is accurately, rapidly and readily accomplished. The groove angle is made 10 to 35 deg. in trapezoidal or U-form and the groove bottom width 2 to 5mm in trapezoidal form and 1.5 to 2.9mm R in U-form.