POSITIONING HOLDING METHOD FOR LONG MATERIAL

PURPOSE:To perform accurate and reliable positioning and to prevent disturbance of machining by longitudinally positioning a long material by means of the one reference hole and an engaging pin, positioning the end part of the long material in the direction of width by means of the two reference hole and the engaging pin, and holding two ends by means of a holding mechanism. CONSTITUTION:During conveyance by means of a truck 70 for machining, the one end side of a C-section steel 20 is engaged with a holding mechanism 81 for holding, holding mechanisms 82-85 are selected according to the length of the section steel to engage the other end for holding, and the section steel 20 is positioned and held in a position on a truck 70. Namely, when the length of the section steel 20 is six modules, pin arms 112 and clamp arms 123 of the holding mechanisms 82-84 are all moved aside. The section steel 20 is lowered from a position above the truck 70, a reference hole 31 on the one side is inserted and engaged with an engaging pin 92 of the holding mechanism 81 on the reference side and a reference hole 32 on the other end side is inserted and engaged with the engaging pin 92 of the holding mechanism 85 on the other end side. Through operation of each clamp arm 94, the end part of a web 20A is nipped, whereby the section steel 20 is positioned and held to the truck 70.