GB760583A - Roof structure - Google Patents

Abstract

760,583. Buildings. TIMBER DEVELOPMENT ASSOCIATION, Ltd. Sept. 27, 1954 [Aug. 7, 19531, No. 21913/53. Class 20(4) The timber arch or portal frame unit comprises wood planks or laminations united along their length and connected and reinforced by a metal plate at the change of direction at a corner joint or angle. Rafters C are made up of planks 1, 2, secured together by wood screws and by fixing bolts where metal gusset plates are fitted. At the ridge an angle plate 5 is located by four bolts in each rafter within recesses 6 at the ends of the abutting planks and fixing together is completed by single-sided timber connectors 7 threaded on the bolts. Instead of recesses the planks may be spaced apart by packing blocks to provide room for the plate. Wood gussets 8 are bolted to both sides of the exposed portion of plate 5. Columns B have planks 14, 14<SP>1</SP> bolted to T-section steel members 10 and an angle plate 12 at the eaves slightly wider than the planks with wood blocks 15 bolted to the overlap. In another construction the rafters are supported at their ends by trunnions which fit into elongated holes in brackets on the side walls. A frame for a church hall comprises three-plank rafters and columns, the rafter tops abutting at an acute angle and the angle plate being formed in two parts each shaped to bend round the respective central timber. Each half plate is secured by two bolts with connectors and a single bolt passing through aligned holes in the central timber secures the rafters together. At the rafter-column joint an angle plate is located between the central and each outer timbers. For a frame used in a Dutch barn the columns include a T-section sandwich plate and the angle plate at the rafter joint is of I-section to the outer flange of which an eaves purlin bracket is fixed. At the upper end the flange is bent upwardly forming a cleat to which a purlin is secured.