Improvements in or relating to girders, beams, trusses and like metallic framework structures and reinforced concrete incorporating such structures

摘要

631,746. Joining metal rods &c. to form girders etc.; floors; reinforced concrete. PRYKE, F. Dec. 12, 1946, No. 36737. [Classes 20(ii) and 20(iv)] [Also in Group XXVIII] Metal rods, strips &c. are built up to form a joist or girder, primarily for reinforcement in concrete floors, by bending parts A1 of the rods A2, A3 forming the transverse members of the joist so that they lie along the longitudinal members B1 B2, and enclosing these parts and the longitudinal members in rings C, wedges D2 being driven axially into or through the rings (Fig. 7), or transversely (Fig. 12) through holes in the. rings to wedge the rods within the rings. The wedges may be shaped as in Fig. 7 to co-operate with the surfaces of the rods, and dummy pieces may be inserted into the rings if necessary, to provide symmetry. A pair of rings V, Fig. 13, may be joined integrally (e.g. welded) to a transverse member T and the other transverse members S' joined as before to the longitudinal by wedges. A ring V may be secured to a single member S', where necessary, by wedging. Fig. 10 shows a finished floor, filler blocks J being suspended from the lower longitudinals E2 of built up joists spaced side by side, by pins J1 passing through upstanding lugs J2 on the blocks. The blocks act as shuttering for the concrete L which embeds the built up joists, and are roughened on their undersides to provide a key for plaster K. If desired similar blocks may be inverted on the blocks J to provide cavaties in the finished floor. The upper longitudinals E1 of the joists are secured together by reinforcement at their ends and the lower longitudinals E2 secured to the abutments of the floor.