Patent ID: 8348221

Claim:
A formwork system for constructing a structural concrete floor comprising: an adjustable main frame ( 100 ) forming a concrete slab formwork structure; a plurality of adjustable side frames ( 110 ) each movably mounted at the edge of the main frame ( 100 ), each side frame forming a concrete beam formwork structure; a plurality of retainers mounted at the edge of the main frame for supporting below the side frames; jacking means for raising and lowering the formwork system; wherein the main frame is provided with a concrete ceiling slab formwork surface; each side frame ( 110 ) forms the side of a respective concrete beam extended from the concrete ceiling slab; the side frames ( 110 ) being movable enable the formwork system to be effectively detached from a casted structural concrete floor having concrete beams extended therefrom; and the formwork system is extricable on site after fabrication of the concrete ceiling slab floor and beams; characterized in that the retainers are cantilever brackets ( 55 ) each comprising: a side truss ( 165 ) detachably mounted to a main prop ( 30 ) of the main frame ( 100 ); an upper horizontal member ( 170 ) at one end attached to the top portion of the side truss ( 165 ); a lower horizontal member ( 180 ) at one end attached to the side truss ( 165 ) for supporting a respective bottom of a respective side frame; a vertical bracing ( 185 ) having its upper end attached to the upper horizontal member ( 170 ) and the lower end attached to the lower horizontal member ( 180 ); a side inclined bracing ( 190 ) having one end attached to the lower horizontal member ( 180 ) and an opposite other end attached to the bottom portion of the side truss ( 165 ); a leveling jack ( 195 ) positioned at the end of a formed lower horizontal primary member for supporting a sheathing ( 5 ) for forming the bottom of the concrete beam at an adjustable position; and a plurality of horizontal beams ( 200 ) transversely disposed at the top of the lower horizontal members ( 180 ) thereof wherein the horizontal beams ( 200 ) each comprising: a plurality of outer portions each having a relatively large cross sectional area; and a plurality of inner portions each having a relatively small cross sectional area telescopically received in the outer portion for selective length adjustment of the horizontal beam; wherein the outer portions are slidable along the inner portions.