Static structures (e.g. – buildings) – Preassembled subenclosure or substructure section of unit or... – With retaining or attaching means
Reexamination Certificate
1998-04-30
2001-05-01
Canfield, Robert (Department: 3635)
Static structures (e.g., buildings)
Preassembled subenclosure or substructure section of unit or...
With retaining or attaching means
C052S079140, C052S236800, C052S258000, C052S259000, C052S262000, C052S271000, C052S284000
Reexamination Certificate
active
06223480
ABSTRACT:
The invention relates to set of pre-cast concrete panels for construction of a building and a method of using the same in the building industry.
In building construction, it is often necessary to construct the structural frame work, floor slab and followed by the erection of in-fill panels (normally they are brick walls). Thereafter additional construction work has to be done in the installation of electrical wires, gas and water plumbing connections and external wall furnishing of the building has to be completed. All these require skilled workers and are time consuming and is expensive. The mould formwork set for pre-cast concrete industries in prior art is expensive because a specific mould only can be used for a particular project.
The objectives of this invention are to mitigate these disadvantages by the use of various types of pre-cast concrete panels, adoption of a universal mould formwork set and the adoption of a new system of construction of a building using the pre-cast concrete panels.
According to the first aspect of the invention, the pre-cast concrete wall panels comprise of:
1. ‘I’ shape panels (straight line in cross-section width wise) and ‘I’ shape panels with door or window opening,
2. ‘L’ shape panels and ‘L’ shape panels with door or window opening,
3. ‘T’ shape panels and ‘T’ shape panels with door or window opening,
4. ‘Cross’ shape cross-sectional panels and ‘Cross’ shape cross-sectional panels with door or window opening on one or more sides.
According to a second aspect of the invention, the pre-cast concrete wall panels, include a pre-cast concrete beam and a pre-cast concrete cornice finishing at one edge.
According to a third aspect of the invention, a plurality of steel links extend from the pre-cast concrete beam of the pre-cast concrete panels. An interlocking system of reinforced concrete beams if formed by the insertion of reinforcement steel bars through the links and the pouring in-situ concrete to construction joints formed by pre-cast concrete slabs and pre-cast concrete beams of the pre-cast concrete wall panels.
According to a fourth aspect of the invention, the length of ‘I’ shape pre-cast concrete wall panel can be adjusted at the construction stage to comply with the architectural and engineering requirements by adjusting the edge formwork of moulding formwork set. The arms of ‘L’ shape, ‘T’ shape and ‘Cross’ shape panels can also be adjusted if necessary, but normally they are constant in single size.
According to a fifth aspect of the invention, the pre-cast concrete slab includes recesses at the central region of the slab panel and pre-cast concrete beams along the perimeter of the slab panel.
According to a sixth aspect of the invention, the sizes of the pre-cast concrete slab panels can be adjusted at the casting stage to comply the architectural and structural requirements.
According to seventh aspect of the invention, the height of the pre-cast beam of the pre-cast concrete slab panel can be adjusted at the casting stage to comply with the structural engineering requirements.
Hollow cores extend longitudinally from one end to the other in the pre-cast wall and in the pre-cast slab panel. The hollow cores are designed to accommodate structural, mechanical and electrical requirement. A reinforced concrete column is formed in a bore by inserting reinforcement steel bars into the hollow core of the pre-cast concrete panel and thereafter in-filled with cast-in-situ concrete.
Walls can be erected and supported by introducing reinforcement steel bars and in-fill cast-in-situ concrete into the cores at both ends of the pre-cast concrete wall panels or by introducing reinforcement steel bars and in-fill cast-in-situ concrete to longitudinal recesses which form core when two pre-cast walls are placed in straight-line alignment to each other.
It would understood that the cores can be provided to ‘T’ shape, ‘L’ shape and ‘cross’ shape pre-cast concrete panels but cores may not be necessary to pre-cast concrete wall panels like ‘I’ shape (straight in cross section). The ‘I’ shape pre-cast concrete panel may be provided with longitudinal recesses at the both ends of the panel without any cores in between.
The structural linking of pre-cast concrete wall panels and pre-cast concrete slab panels is carried out by introducing reinforcement steel bars through the links extending from the pre-cast concrete beams of the wall panels, adding wire mesh and top bars to the top surface of pre-cast slab panels and pre-cast beams respectively, then pouring concrete into troughs formed by pre-cast concrete slabs and the pre-cast concrete beams to form construction joints. For single storey building, ‘U’ shape steel bars are inserted into the cast in-situ concrete columns next to each other from the two linearly aligned adjacent pre-cast concrete wall panels.
In-fill wall panel between comers of pre-cast concrete wall panels or between any two desired points can be obtained by using a single panel or plural number of ‘I’ shape straight wall panels placed in a linear alignment to each other. The length of any panel can be adjusted at the casting stage by sliding an adapter without altering the moulding formwork set.
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Canfield Robert
O-Stable Panel Sdn Bhd
Townsend & Townsend & Crew LLP
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