Static structures (e.g. – buildings) – Module or panel having discrete edgewise or face-to-face... – With joining means of dissimilar material and separate from...
Patent
1997-01-29
1998-08-25
Smith, Creighton
Static structures (e.g., buildings)
Module or panel having discrete edgewise or face-to-face...
With joining means of dissimilar material and separate from...
526569, 52281, 522821, 403230, 403271, E04B 100
Patent
active
057972354
DESCRIPTION:
BRIEF SUMMARY
This invention relates to double skin composite structures which comprise a layer of filler material (usually a cementitious material such as concrete) faced with plates (usually carbon steel) and methods of producing the same. A lighter filler material such as a filled synthetic resin may be employed for certain applications. More especially, but not exclusively, the invention concerns double skin composite structures assembled inter alia from double skin composite panels which comprise two facing plates positioned one on each side of a layer of concrete and connected thereto by cross members.
Double skin composite structures may be constructed from a variety of materials which themselves can be used in different ways. Usually, such structures comprise a steel-concrete-steel sandwich construction and exhibit similar characteristics to those of reinforced concrete structures and are advantageous in that the steel facing plates act as reinforcement to enable the required strength characteristics to be achieved with structures of overall depth less than those of reinforced concrete. The steel facing plates also define impermeable membranes which protect the concrete in use. High reinforcement ratios are possible and the steel plates act as permanent shuttering for the central concrete layer. The structures exhibit relatively high ductility and impact resistance, are lighter than conventional reinforced concrete and offer reduced construction costs and decreased build times.
Double skin composite structures are known which are assembled from a multiplicity of individual double skin composite panels, each panel being welded to its neighbouring panels.
Thus, GB-A-2136032 and GB-A-2136033 disclose offshore structures in which series of arcuate elements having inner and outer steel plates linked by steel webs and filled with cementitious material are welded together. Also, GB-A-2258669 discloses a concrete-filled steel bearing wall which comprises a pair of steel surface plates secured by connecting members and filled with concrete. Neither GB-A-2136032 nor GB-A-2136033 addresses the possibility of securing, for example, horizontal and vertical elements together. GB-A-2258669 discloses arrangements in which concrete-filled steel bearing walls support concrete flooring. In these arrangements, the concrete flooring simply overlies the upper end of the respective bearing wall to receive support therefrom.
It will be accepted that in all but the simplest of structures, it will be necessary to connect sections of joined double skin composite panels together to form, for example, "T" and "X" joints. To do so simply by welding together adjoining steel plates of neighbouring panels as intimated by GB-A-2136022 and GB-A-2136023 or in the manner proposed by GB-A-2258669 creates a number of problems, a major one being that some of the most critically stressed welds are inaccessible for inspection after the introduction of concrete between the steel plates. These welds are also difficult to make because of poor access, tending to increase the probability of defects which would cause problems in the structure's service life. Also, many of the welds are of necessity single sided resulting in poor fatigue classification. Also for curvilinear panels, considerable material wastage may occur in cutting out the plates to form the connections.
It is an object of the present invention to provide a double skin composite structure (and a method of producing the same) including such joints which overcomes, or at least alleviates, the problems discussed above.
A "seamless section" is an elongate non-planar section produced as a single piece to include two or more lengthwise extending elements each of which is inclined to its neighbouring element. Seamless sections may be produced by hot rolling, cold forming, extrusions, casting or other forming process. The angle between neighbouring elements may be a right angle or an angle below 90.degree. or above 90.degree.. Sections include "I" sections, "H" sections, "T" sections, channel sections
REFERENCES:
patent: 2671539 (1954-03-01), Kiefer
patent: 3228161 (1966-01-01), McCown
patent: 3685222 (1972-08-01), Curtess
Bowerman Hugh Gordon
Burgan Bassam Adeeb
British Steel PLC
Smith Creighton
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