Double skin composite panels

Details Double skin composite panels Double skin composite panels

1996-11-25

1998-04-21

Ryan, Patrick

Stock material or miscellaneous articles

Structurally defined web or sheet

Nonplanar uniform thickness material

428119, 428120, 428172, 428179, 428192, 428213, 428614, 5230914, 5230915, 5230917, 52437, 527825, 527831, 5279612, B32B 900

Patent

active

057415714

DESCRIPTION:

BRIEF SUMMARY
This invention relates to double skin composite panels which comprise a layer of a 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 filled synthetic resin may be employed for certain applications.


BACKGROUND OF THE INVENTION

Double skin composite panels exhibit similar characteristics to those of reinforced concrete structures and are advantageous in that the facing plates act as reinforcements to enable the required strength characteristics to be achieved with structures of overall depth less than those of reinforced concrete. High reinforcement ratios are possible and the plates act as permanent shuttering for the central concrete layer.
Double skin composite panels are known which comprise two steel facing plates positioned one on each side of a layer of concrete and connected thereto by transverse cross members which extend generally normal to and are attached at their ends to both facing plates. Such panels are disclosed in GB-A-2136032, GB-A-2136033 and GB-A-2258669.
GB-A-2136033 teaches that the spacing between the transverse cross members of a double skin composite panel is preferably equal to the spacing between the facing places of the panel. Also that the spacing between the cross members can be as great as up to four times the spacing between the facing plates but is advantageously less than twice this spacing. Neither GB-A-2136032 nor GB-A-2258669 teaches what spacings are desirable.
Hitherto, such double skin composite panels have been produced in situ, that is to say at the site at which they are to be installed or major sub-structures assembled. On site production not only doubles the amount of required on-site handling because each skin is handled separately but also significantly increases the production costs of the panels. Generally, these known panels comprise a combination of relatively thick facing plates, internal ties and facing plate stiffeners. They also require external support and/or internal stiffeners to the facing plates during pouring of concrete between the plates to avoid structural distortion caused by the high hydrostatic pressures produced during pouring. It has also been found necessary to limit the height from which or the rate at which concrete is poured to reduce such pressures.


SUMMARY OF THE INVENTION

Double skin composite panels of the present invention are intended to be factory produced and delivered to site as integral structures comprising facing plates secured together by transverse connecting members. The plates may be flat or curved.
The dimensions of panels in accordance with the invention are such that they are rigid enough to hold their shape during handling to enable large structures to be rapidly and accurately assembled. Individual panel sizes up to 3.5 m wide by up to 18 m long are feasible, minimising construction time on site. Relatively close spacing of the transverse connecting members allows concrete to be poured to high heads without distorting the structural shape of the panel and without the need for internal reinforcement or external bracing.
Panels in accordance with this invention enable double skin composite structures to be built in thicknesses that would hitherto have been impractical.
Trials and experiments conducted by the applicants have shown that, for the majority of double skin composite panels of potential commercial interest, there are limits which must be placed on facing plate thickness, plate separation and cross member spacing if the required panel strength and handliability are to be achieved. Also, that each cross member must be secured to both facing plates, preferably by welding with its longitudinal axis substantially normal to the generally parallel facing plates. These trials have also established that panels having transverse connecting members attached to both face plates can have greater strength than conventional structures having overlapping shear studs.
Thus, applicants have est

REFERENCES:
patent: 5526625 (1996-06-01), Emblim et la.

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