Offset heater molding tables equipped with such offset and process for manufacturing elements in concrete to take accelerated

摘要

1,139,576. Curing concrete. E. P. M. INTER. NATIONAL. 22 March, 1966 [22 March, 1965], No. 12639/66. Heading F4G. [Also in Division H5] A heating panel 1 for curing concrete comprises an electric resistance heating element 2 made of thin elongated conductors, sandwiched between thick and thin layers 16, 1a of electrically insulating material connected together by mechanical fastening means e.g. flat headed nails. Adhesive may be added between the layers and an insulating layer of glass cloth or asbestos inserted between the element and lower layer 1b. The top layer is of laminated wood and the element of Cu wire gauze or metal foil. The panel may be curved with the lower layer of planks (24), Fig. 7 (not shown) or flat when it rests on ribs and beams to form a table, Fig. 4 (not shown). The table rests on a concrete floor connecting vertical walls and concrete is poured on the table to form another floor. The panel is supplied with 3 phase A.C. from a transformer beneath the panel.