GB370164A - Improvements in or relating to pre-cast beams for concrete floors, roofs and the like - Google Patents

Abstract

370,164. Pre-cast beams for floors &c. MORTON, B. and MORTON, H. D., Edgeworth, Hawley Lane, Hale, Cheshire. March 17, 1931, Nos. 8121, 9312, and 34936. [Class 20 (iv).] Floor or roof structures composed of precast concrete beams of T-section, in which the upper webs form the entire floor surface, have at each end a web-like extension formed by omitting parts of the top flanges, or by slotting the beam from each end, the beams resting by their extensions on supporting girders or their haunching and being fixed in position by grouting filled into the spaces between the extensions. Fig. 1 shows a form in which the extension b is formed of the whole depth of the web. In Fig. 4, the extension b is of less depth and has a sloping upper surface ; the upper surface may also be horizontal. Fig. 2 shows the beams resting on a girder g and fixed by grouting. The beams may be formed with lateral flanges e, Figs. 2 and 4, which will avoid the need for shuttering for retaining the grouting, or pre-cast blocks cemented in position may be used instead of grouting. Fig. 7 shows a form in which the web is slotted at c, the beam being supported on haunching. The upper surface may be flat or slightly arched, and the edges may be furnished with interengaging tongues and grooves. The undersides may be covered by expanded metal &c. to form a ceiling.