Stock material or miscellaneous articles – Three or more coplanar interfitted sections with securing means
Patent
1991-08-16
1994-07-12
Lesmes, George F.
Stock material or miscellaneous articles
Three or more coplanar interfitted sections with securing means
428 54, 428 55, 428 56, 428 74, 428 76, 428290, B32B 300, B32B 310, B32B 314, B32B 316
Patent
active
053287398
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a longitudinal laminate board of binder fixed mineral wool, which is suitable as a core of a sandwich element, having surface layers, e.g. of sheet metal, on each side, consisting of adjacently disposed rods whose longitudinal direction forms a right angle to the plane of the laminate board.
BACKGROUND OF THE INVENTION
Laminate boards of this type are prior known, having been used for instance in shipbuilding industry as insulating walls of various spaces.
Sandwich elements of mineral wool have been utilized to some extent in building industry. However, so far long elements have not been available, neither as roof or floor elements, nor as wall elements.
The idea of rotating cut laminates 90.degree. and of reassembling them in the turned position, thus providing a laminate board having fibres orientated perpendicularly to the plane of the board, is prior known. Such a laminate board has excellent resistance properties and is able to transmit shearing forces between its surface planes.
Finished sandwich elements of mineral wool with the fibres orientated perpendicularly to the surface plane of the element would be usable as roof, floor and wall elements, thus simplifying construction operations noticeably.
SUMMARY OF THE INVENTION
The object of the present invention is to provide long laminate boards which are usable as a core of supporting sandwich elements for roof, floor and wall constructions.
According to the invention, this object has been achieved by composing the laminate board of rods, the length of which is less than half of the length of the laminate board and by bringing these aligned rods into contact without intervals, thus forming joints, and none of the joints is in the immediate vicinity of any of the ends of the laminate board, when the board is being used as a one-field board having supports at the ends, or immediately next to a support line, when the board is being used as a multi-field board.
According to the invention, a long construction board, of up to 9-10 m, can be provided by means of laminates rotated and assembled in the same manner, without handling mineral wool mats and cut laminates of a corresponding length that is, a length of 9-10 m. By composing the laminate board of aligned rods of a length that is less than half of the length of the laminate board so that aligned rods are in contact without intervals, forming joints between each other, and by appropriately distributing the joints over the surface of the laminate board, a board is achieved which, when used as a core of a sandwich element, has resistance properties corresponding to a board without joints, i.e. in which the weakening effect of the joints has been eliminated.
According to a preferred embodiment of the laminate board, none of the joints is disposed closer to a support of the laminate board than when a =L divided by 1.9 n where L equals the length of the laminate board, when the board is being used as a one-field board supported at its ends, and L equals the span, when the board is being used as a multi-field-board and also supported intermediated its ends, and n equals the number of laminates laterally in the laminate board.
The parametre a indicates the length of the critical area within which the existence of joints has to be limited in order to prevent the joints from weakening the resistance of the board when used in building constructions. Critical areas exist next to the ends of the board, where the boards are supported, and next to the support lines between the ends. A force concentration namely arises at intermediate supports like at the ends, when the support points are provided there. The conclusion concerns elements in a horizontal position as well as elements in a vertical position.
As a general rule the distance a, indicating the length of the critical area, equals L divided by 2 n since the support lines, among others, have a certain extension or width, the length a should be somewhat longer, and thus the length L is appropriately divided b
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Brunila Esko
Heselius Lars
Lesmes George F.
Morris Terrel
Oy Partek Ab
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