Static structures (e.g. – buildings) – Facer held by stiffener-type frame – Facer back abuts and conceals frame
Reexamination Certificate
1997-07-15
2001-04-10
Chilcot, Richard (Department: 3635)
Static structures (e.g., buildings)
Facer held by stiffener-type frame
Facer back abuts and conceals frame
C052S481100, C052S799110, C052S801110
Reexamination Certificate
active
06212839
ABSTRACT:
TECHNICAL FIELD
The invention relates to a structural element for building structures comprising a frame structure and an outer plane. The outer plane is constituted by a plurality of plate-formed sandwich elements. The structural element of the present type can be used for example as a movable or fixed vehicle deck on ships.
BACKGROUND TO THE INVENTION
Structural elements such as ships' decks, loading hatches and the like are traditionally made up of steel beams and arrays of plates. The steel beams are part of a more or less complete frame structure comprising, amongst other things, reinforcements for preventing buckling in said plate arrays. Such constructions are used nowadays for instance as movable vehicle decks in Ro-Ro ships. Since these movable vehicle decks are intended to be lowered down from an elevated, stowed position below an overlying deck, attempts are made to make the deck as light as possible. The desired load capacity for modern Ro-Ro ships is ever increasing, which often means more fixed and movable vehicle decks on board new ships. This increases the requirement for weight savings in the ship. Today's traditionally constructed vehicle decks are however already almost as light as possible when taking account of their structural limitations.
PRIOR ART
EP-A-0 074 732 discloses a structural element for building structures, having panels which merely are cover panels which have merely a two-dimensional connection to the beams of the framework. Their contribution to the overall strength of the structural element is very poor.
OBJECT OF THE INVENTION
The object of the present invention is to solve the aforementioned problems by providing a structural element for use, for example, as a movable vehicle deck, which offers an appreciable weight saving with respect to known devices and at the same time leaves the strength of the structural element unaffected.
SOLUTION
The above-mentioned object is achieved in the present invention by providing a structural element for building structures which is characterized in that said sandwich element comprises a core positioned between two cover plates, that said core consisting of a framework structure, that said sandwich elements serve as flanges for beams with conventional webs which are included in the structural element and that the sandwich elements are directly connected with the webs of the beams, whereby the sandwich elements are connected with said frame structure in such a way that they integrally contribute to the overall strength of the structural element.
Said sandwich elements preferably comprise a core positioned between two cover plates, said core consisting of a pyramidal framework structure. It should be mentioned however that the sandwich element can also be constructed in many other different ways. The core can also present for example a corrugated board structure or a honeycomb pattern.
As a result of the invention, a weight saving of up to 30% can be achieved when compared to traditionally built structural elements. This allows, for example, new Ro-Ro ships to be able to be built with notably increased load capacity without a resultant reduction in the ship's stability.
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patent: 36 36 653 A1 (1988-05-01), None
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Derwent's abstract, No. K9507 E/33, week 8233, Abstract of SU, 872373 (Ivlev, A.P.) Oct. 15, 1981.
Chilcot Richard
Lerner David Littenberg Krumholz & Mentlik LLP
Macgregor (SWE) AB
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