Static structures (e.g. – buildings) – Composite prefabricated panel including adjunctive means – Perforate panel having separate attached – elongated edging...
Patent
1987-07-21
1991-04-16
Safavi, Michael
Static structures (e.g., buildings)
Composite prefabricated panel including adjunctive means
Perforate panel having separate attached, elongated edging...
52800, E04C 232
Patent
active
050072250
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the construction of large sandwich metal structures from plate material.
It has particular application to ship building, in which composite metal structures incorporating metal plate are used in hull, superstructure, deckhouse, bulkhead or hatch fabrication etc, and accordingly the invention will be described below primarily in such a context. However, the invention also has utility in respect of other structures such as linkspans, bridges, oil rigs, offshore structures, platforms, containers, buildings, columns, pontoons, tubes, pipes, and like large welded constructions.
In the construction of ships, the basic unit of the hull or bulkhead construction and other parts of ship construction is conventionally a composite panel. Such a panel is typically made by (a) cutting up plate material into predetermined sizes (b)butt-welding together the edges of a number of such plates, and (c) applying stiffener bars parallel to (or across) the butt welds. This forms a stiffened panel, stiffened by the bars which are of various cross sections but often rather L-shaped in cross-section with a short foot portion integral with a long shank portion projecting from the panel. Such panels can be further fabricated using large dimension connecting webs welded to the plates at right angles and/or parallel to the stiffeners, and possibly also mounting another such stiffened plate opposed to the first to form a double skin compartment.
Conventionally a number of different weld techniques are used in this construction such as butt welding, fillet welding, overhead welding and the like. The process can moreover involve major lifting and turning of the panel during its construction and/or can involve the need for welding operatives to work in confined internal spaces of a double skin. Our own earlier Patent Applications discuss weld techniques involving lasers to rationalise and facilitate these known methods.
These earlier laser techniques were however confined to utilising lasers in such a way as to produce a composite article of more or less conventional overall appearance (that is to say conventional apart from details of the weld) which can be utilised as it stands in existing structures.
We have now discovered a generally new construction of composite panel; methods for its fabrication; methods for its onward utilisation (that is to say, joining up with similar such composites); details of fixing, repair and transition techniques using such composites; and, in general, a new type of sandwich large-scale metal construction, especially of ship construction, using such a composite.
In one aspect the invention provides a ship or like large-scale metal construction in which structural, sub-dividing, or enclosing, hulls, bulkheads, deckhouses or like structures comprise composite metal panels consisting of two parallel plates secured to the peaks and troughs respectively of a corrugated metal stiffener plate arranged between the parallel plates.
The type of structure defined above can be used alone, for example, for bulkheads, or like sub-division or cladding elements. However, two or more such structures can themselves be linked together and form a parallel composite to define a hull compartment including sub-divisions.
In another aspect the invention comprises a composite metal panel comprising two parallel plates secured to the peaks and troughs respectively of a sandwiched corrugated metal stiffener plate by weld lines extending along the peaks and troughs.
Such a panel is a preferred constructional element of the ship construction and others as defined above.
Although the techniques of the invention can be used over a wide range of thicknesses, generally speaking plates from 1 to 25 millimetres thickness are envisaged for the component parts of the composite panel applied to ships. For other applications greater thickness may be required. It will be found usually preferable to have the two parallel plate portions each thicker than the metal thickness of the corrugated plate portion.
The spacing of t
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British Shipbuilders
Safavi Michael
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