Patent GB-313508-A (GB)
Title: A method of and apparatus for forming and erecting concrete slabs for the walls of buildings
IPC: E04G11/32
Filed: 1928-02-07
Abstract: 313,508. Fowler, T. W. Feb. 7, 1928. Moulding walls in situ.-Concrete slabs A, which may be ribbed and recessed on one face as shown in Fig. 1, are moulded in collapsable horizontal moulds B tiltably carried at the ends of lever arms 14 pivoted in bearings 13 on vertical members 11 of a frame or support 10. The mould cradle 19, Fig. 2, is locked in the horizontal position to the levers 14 by stay links 20, and the levers 14 are secured by pins 15 passed through holes in uprights 16. When the concrete has set, the bottom members 34 of the mould frame are removed and the cradle with the slab still in position thereon is tilted into the vertical position (after disconnection of the stays 20). The pins 15 are then removed and the levers 14 raised, whereby the slab is lowered on to the foundation 37. The cradle 19, the side members 26, 27, and the back (or base) of the mould, can then be removed after the slab has been shored or fixed in position. Other slabs may be erected in similar manner to complete the building or fencing wall, adjacent ends being joined, as by running grouting :into the spaces formed between the adjacent ends of the slabs, and by tying together in such spaces the projecting ends of reinforcing rods 40. The top bar 33 of the mould frame may be removable, or if desired it may be left in position to form a wall-plate, in which case it is secured to the slab during casting by inwardly protruding wires or nails 33<1>, Fig. 8. The mould frame comprises a number of separate inverted trays formed by members 28, Fig. 7, extending from the top 33 to the bottom 34, Fig. 1, of the mould and connected bv hooks 38 to the horizontal bars 18 of the cradle 19. The members 28 are connected by cross-bars 29 and have hook-members 32 at the top ends which are temporarily secured by nails 35 to the top bar 33. The bottoms of the trays are corrugated sheets 30 of wood or metal, the corrugations 31 being adapted to receive the reinforcement bars 40 and to form the ribs on the back of the slabs. Spacing strips 39 are placed between the trays and co-operate with the members 28 to form vertical ribs on the slabs. Such ribs may be of breeze concrete to permit a lining of wood, fibro-cement, or the like to be nailed or secured to the slabs, or nailing strips 43 may be secured to the ribs during the casting operation, or protruding bolts 38<1> may be cast into the ribs. The mould trays may be formed of wood, wood and metal, or entirely of sheet metal. By the use of suitable forms in the mould frame, door and window openings may be provided in the slabs, or the actual door &c. frames may be embodied in the slabs during casting. Hollow walls may be formed by casting two slabs and erecting them face to face, the outer one of such slabs being plain on both faces if preferred, and the slabs being secured together by wallties. Fig. 11 shows a grouted joint for the contiguous ends of two slabs, formed within a mould 51. The ends of the slabs may be oiled or greased to prevent adherence of the grout; and for fencing walls, the grout may be poured into holes in the ground below the joint so that a post is formed.