FI59643C - PELARE ELLER BJAELKE FOER ANVAENDNING I STOLPSKELETTVAEGGAR OCH TAKKONSTRUKTIONER - Google Patents

Description

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Patent- och ragiaterstyraiMn 7 Am »ku utla« d och uti. * Krift «n pubikund 29-05-01 (32) (33) (31)« uolkuut — Begird prlortm 31.03-76

Denmark-Danmark (DK) 1 ^ 72/76 (71) Rockwool International A / S, Hovedgaden 501, 26U0 Hedehusene, Denmark-Danmark (DK) (72) Jurgen Skjold Petersen, Roskilde, Denmark-Danmark (DK) (jh) Oy Kolster Ab (5 * 0 Pillar or beam intended for use in pillar frame walls and roof structures - Pelare eller bjälke för användning i Stolp-skelettväggar och takkonstruktioner

The present invention relates to a composite, load-bearing, column-shaped or beam-shaped building element consisting of a central body and two wooden bars attached to opposite sides of the central body and intended for use in column-framed walls and roof structures of houses, especially well-insulated houses.

Rising fuel prices in recent years are forcing the use of even thicker thermal insulation materials. In the external walls and roof structures (upper bottoms) of the houses, it is now economically justified to use 20 cm thick mineral wool shaped pieces. In order to if the spacing of the columns or beams of the structures could give space for insulating materials of said thickness, the cross-sectional size of the columns or beams must be e.g. 5 x 20 cm or 7.5 x 20 cm. Pillars or beams made exclusively of wood with this cross-sectional size become very expensive. Moreover, in a well-insulated structure, solid wood columns or beams extending from the warm side to the cold side through the structure can considerably, e.g. 20%, increase the heat transfer through the wall.

The building element according to the invention is characterized in that the central body consists of a form-retaining mineral fiber felt and is fixed to the wooden rods along its entire length.

A form-shaped mineral fiber felt, also called a mineral wool felt, is a product consisting mainly of mineral fibers, more specifically glass, stone or slag fibers, and which also contains smaller amounts of an organic binder, e.g. A mineral fiber felt suitable for forming the center piece of a building element according to the invention may have 0.92 ...

0.96 porosity.

The invention will be illustrated with reference to the accompanying drawing, which shows a part of a pillar frame wall which has not yet been completed. The wall pillar frame has been erected and 9 mm fibreboards have been attached to both sides, so that part of the pillar and parts of the fibreboard are shown in the drawing. The pillar consists of a central body 1 of form-retaining mineral fiber felt and two wooden rods 2 and 2 'glued to it. The wood fiber boards 3 and 3 'are attached to the rods with nails 4.

Example

The column was assembled from a central piece consisting of a mineral fiber felt piece with a porosity of 0.94 and a cross-section of 5 x 15 cm, and two wooden rods with a cross-section of 5 x 2.5 cm, so that the cross-section of the column became 5 x 20 cm.

If the pillar frame wall has to support the weight of the building components above, the wooden bars alone will have to transfer force to the substrate because the modulus of elasticity of the mineral fiber felt is much lower than that of wood. It is desired to be sure that no buckling occurs in the event that the entire load is applied to one of the two bars of the column. The column, assembled according to the example, was cut to a length of 1.80 m and an increasing longitudinal compressive force was applied to its other rod. Buckling had not yet occurred with a compressive force of 5000 kp.

The 1.80-long rod alone buckles under 900 kp of compressive force.