Patent EA-005174-B1 (EA)
Title: Formwork for precast concrete panels
Inventor: KHOO TIAN
IPC: B28B7/02
Filed: 2002-04-01
Abstract: 1. A formwork for precast concrete panel comprising of a quadrangle panel with a base and four side panels characterized in that the formwork (10) comprises of a base (14) which is provided with an island region (20) and/or a mound region (22), a pair of parallel fixed spaced apart side panels (16) and a pair of parallel moveable side panels (18), wherein said island region (20) and/or mound region (22) is positioned between the parallel moveable paced apart side panels (18) and wherein said parallel moveable spaced apart side panel (18) are removeably secured to the parallel fixed spaced apart side panels (16) in a tight manner in any desired distance from the center of the island (20) and/or mound (22) region. 2. A formwork as claimed in Claim 1 wherein the parallel moveable spaced apart side panel (18) is slideable against the pair of parallel fixed spaced apart side panel (16). 3. A formwork as claimed in Claim 1 wherein the parallel moveable spaced apart side panels (18) are secured to the parallel fixed spaced apart (16) side panels at pre-determined discrete distance from the center of the mould. 4. A formwork as claimed in Claim 1 wherein the parallel moveable spaced apart side panels (18) are positionable to a predetermined distance apart and wherein the same formwork (10) with an island region (20) and/or mound region (22) is usable for constructing precast concrete panels of different pre-determined widths. 5. A formwork as claimed in Claim 1, wherein at least one of the pair of the parallel moveable spaced apart side panel (18) includes a longitudinal ledge (26) such that the therein-casted panel would include a longitudinal channel (34) corresponding to the longitudinal ledge (26). 6. A formwork as claimed in Claim 1 wherein at least one of the pair of parallel fixed spaced apart side panels (16) includes at least one aperture (24) to receive at least one reinforcement member. 7. A formwork as claimed in Claim 1 wherein the peripheral side of the island region (20) includes a patterned edge. 8. A formwork as claimed in Claim 1 wherein the peripheral side of the mound region (22) includes a patterned surface. 9. A formwork as claimed in Claim 1 wherein the mound region (22) optionally includes a mould of any desired impressions. 10. A formwork as claimed in Claim 1, wherein a subsidiary formwork (12) is assembled thereon to the formwork (10) in which the subsidiary formwork comprises of a pair of longitudinal spaced apart panels (28) across the pair of parallel fixed spaced apart side panels (16) wherein the inner sides of the longitudinal spaced apart panel (28) form the sides of a mould and the upper surface of the concrete in the formwork (10) forms the base of the mould, said mould is designed to receive concrete such that on setting, a projecting edge (30) is formed. 11. A formwork as claimed in Claim 10, wherein the subsidiary formwork (12) is positionable at any point along the parallel fixed spaced apart side panels (16). 12. A formwork as claimed in Claim 10, wherein in the subsidiary formwork (12), the distance apart between each member of the set of longitudinal spaced apart panel (28) is variable such that the casted longitudinal ledge (30) is of variable pre-determined width. 13. A formwork as claimed in Claim 10, wherein a longitudinal channel (32) is accommodated within the subsidiary formwork (12) such that the therein, casted projecting ledge (30) includes a longitudinal channel (32).