| 摘要 |
1,098,630. Moulding concrete. SPAN DECK Inc. Nov. 9, 1965, No. 47417/65. Heading B5A. [Also in Division E1] A concrete building element having a heat and sound insulating core is made by first laying and consolidating a layer 21 of a " dry " concrete mix on a longitudinally extending casting bed (33) Figs. 1, 2 (not shown), laying reinforcing rods (31) therein and pre-tensioned cables (30) thereover and then continuously depositing therein vermiculite from a hopper 87 and a " wet " concrete mix from a hopper 89, both hoppers being mounted on a frame 84 movable on wheels 86. A downwardly depending portion 110 of hopper 87 opens into the forward end of a core mould 88 which comprises only a front wall 106, side walls 105 and a top wall 104 which slopes downwardly rearwardly. The rearwardly disposed hopper 89 deposits the wet concrete from a shoot 117 on to the top and sides of the core mould, so that as the frame 84 moves the layer of vermiculite from the interior of the core mould is surrounded by the wet concrete. A treble cord plank (20), Figs. 13, 14 is formed by disposing three core moulds longitudinally in parallel, the vermiculite and wet concrete being distributed evenly thereto. A shoe 131 and a screed (96), Fig. 6, smooth the " wet " concrete as the frame passes the concrete being distributed evenly by a vibrator 134 carried by a pulley driven eccentrically weighted shaft. The frame 84 is removed when it has travelled the length of the bed 33, the inset plank then being cured for 12-15 hours by lowering thereover a hood (149) which is filled with steam from pipes 152. After curing the pre-tensioned cables are cut and the plank is cut into suitable lengths using a diamond saw (154), Fig. 12 (not shown). The core may be removed to give hollow planks, and " wet " concrete may be used for the base layer 21. A series of planks may then be transversely joined to form floors. In a further embodiment for making a single cored slab, Figs. 16-18 (not shown) a simplified apparatus is described in which the vermiculite and " wet " cement hoppers (217), (215) respectively are combined. In both embodiments a "dry" concrete mix comprises 820 lb. of expanded shale, 188 lb. of cement and sufficient water to bring the mix to a damp, slightly sticky but still granular consistency; a wet" mix comprises 730 1b. of # inch - # inch limestone, 730 lb. of “ inch dust expanded shale, 517 1b. of cement and sufficient water to give a 6 inch slurry. The density of the " dry " mix is about 65 1b./cu. foot, and the '' wet " 110 1b./cu. foot or more, the latter having a 28 day strength of 5000 p.s.i. |
