| 摘要 |
A fixing bracket 5 in a roof construction is a metal sheet with two parallel grooves 39,40 pressed therein to protrude as ribs from the other side of the sheet, each groove extending from one edge of the sheet to another with two straight end portions and a central partcircular central portion. The outer edge of the sheet is concentrically part-circular and the inner edge is folded up at 38. Such a bracket, or a pair of such brackets back-to-back with grooves 39, 40 protruding, can connect cold-rolled channels 1,2 e.g. as used for the uprights or rafters of a portal frame structure, with compatible longitudinal base grooves. The channels are again usually used in back-to-back pairs and the brackets are bolted within these back-to-back pairs of channels. The included angle can be from 90-135 DEG for eaves brackets, or from 90-180 DEG for ridge brackets. |
