Static structures (e.g. – buildings) – Module or panel having discrete edgewise or face-to-face... – Edge-to-edge openwork panels
Patent
1991-06-13
1994-06-21
Friedman, Carl D.
Static structures (e.g., buildings)
Module or panel having discrete edgewise or face-to-face...
Edge-to-edge openwork panels
52630, 52283, 52483, 52672, E04C 208
Patent
active
053219287
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a steel coffer for ceiling and/or wall structures, in particular for interior and exterior structures of ships or transportable or easily movable building and housing units.
Steel bulkheads, which in their disposition are essentially used as fire protection or which determine structural stability, have long been known as vertical or horizontal boundaries for spaces in ship construction.
The structural goal is to bridge as large as possible support distances, i.e. bearing widths, and to reduce the number of structural support columns for ceiling structures. At the same time, there is a requirement of creating space for installation of utilities, such as ventilation, water, heating, fire-fighting devices, etc.
For example, steel bulkheads are used as ceiling panels with a sheet metal thickness of 6 to 7 mm, instead of using the required minimum of 5 mm, because the subsequent welding operations cause too great an amount of warping and require appropriate finishing work.
Long stalk, T-shaped support pieces are placed underneath and welded in accordance with static calculations. The free areas of the plates of sheet metal created by this are stiffened by means of special shipbuilding sections. This structure is welded together into building segments which can be moved by a crane and are possibly used more than once in order to create optimum welding positions and prerequisites.
The segments are later combined with other segments and welded together.
A common problem is to make do, along with the least amount of steel used, with as little as possible bracing and twisting of the structure, because of the considerable welding work required.
OBJECTIVES AND SUMMARY OF THE INVENTION
It is the object of the invention to provide a steel coffer with high load-bearing capacity in the form of a simple, cost-effective prefabricated structural element with optimal weight, in connection with which welding work can be considerably reduced, which represents a low-warping structure which can be connected with the same type of plates and supports in a modular construction and which is provided with installation aids and perforations for utilities for forming ceiling and/or wall structures.
The basic structural arrangement of the clear, spanned surface and the corresponding supports is not changed by the steel coffer in accordance with the invention in the form of a folded and stiffened coffer element.
The clear spanned area between four supports is formed by a sheet steel plate made of sheets of 5 mm thickness. The approximately 450 mm high edge sections between the supports are formed by means of bending the sheet steel plate. One or two further folds are formed on the folded edge section to use it statically in an advantageous manner.
This repeatedly folded edge section extends over all four edge areas of the sheet steel plate and forms the bearers of the steel coffer.
The required notches for folding the formed edge sections and to receive the supports are cut out of the corners of the sheet steel plate. The required perforations for the subsequent installation are made in the edge sections by means of stamping techniques, flame cutting, lasers or the like.
Bores are furthermore made in the folded support sections of the sheet steel plate, by means of which adjacent sheet steel coffers are combined at their folded edge sections by means of riveted, screw or bolt connections. For the static improvement of the adjacent steel coffers it is possible to make a minimum of welded connections at suitable points between the finished coffers.
For stiffening the clear area surfaces between the supports, a plurality of stiffening sections, made by means of spot welding techniques or point fusion welding or welding beads, are fixed below the coffer wall and/or on the edge sections in the guide strips and/or at the front ends of the stiffening sections, because of which warping is reduced to a minimum.
A steel coffer of this type is simple in its structural design, cost-effective in
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Canfield Robert J.
Friedman Carl D.
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