DE2650353A1 - COMPONENT FOR ROOF CONSTRUCTIONS - Google Patents

Description

Note: van Egteren Industriele Construct! Ebeton Haatschappij B.V., Hanzeweg 12, Hasselt (Ov.) The Netherlands

Designation: component for roof structures

The invention relates to a box-shaped component as a carrier of a roof covering, which consists of core parts and two outer walls, each consisting of a single plate, is formed, the core parts being made of Bars are built, the ends of which are attached to an outer wall. The invention also relates to a Construction system for pitched roofs, consisting of several box-shaped building elements resting on the ends composed.

Such components are known from Dutch patent application 7305571. There were such things before box-shaped constructions known. The permissible

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The spans were usually limited to about 2.4 m. By using core parts according to Dutch patent application 7305571, which consist of intersecting strips made of high-quality plywood or a material with similarly favorable properties and outer walls made of relatively inferior material, spans of more than 5 m can be achieved. The latter is also possible through the use of high-quality outer walls, for example made of plywood, with a simpler core construction. Another possibility for achieving large spans is the use of laminated wooden strips as core parts. In all cases, however, the costs of such a component are relatively high. Rather, the endeavor is directed towards the production of expedient but relatively inexpensive components. These elements must be able to be laid from wall to wall, so that rafters can be dispensed with and a smooth inside is obtained at the same time.

The object of the invention is now to create a box-shaped component for roof structures that has free spans of at least 5 m made possible, whereby the cost expenditure by a certain choice in the lonstauktion and in the Material below that of the already known constructions.

According to the invention, this is achieved by the fact that the outer walls of the element consist of sintered bridge and a high temperature made of lignocellulose fiberglass panels, which have a length of aiiacäestess 3 rar, eiae dieke 3a, 5 to 3 cran tanei <äi® have the following properties %

Winning tensile strength
3 module

«

Tensile strength parallel to the plate surface 230 kp / cm

ο Tensile strength perpendicular to the board surface 7.5 kp / cm

According to one embodiment of the invention, the wood fiber panels fixed vertically on the fibreboard panels by a system of one or two Bars made of the same material are held at a distance of at least 20 cm from each other. These structures are in the longitudinal direction of the wood fiber panels at a mutual distance of at least 40 cm (from center to Center measured).

The bar structures preferably have a mutual relationship Distance of approx. 60 cm. This distance corresponds to one usual width of the wood fiber panels made from the material mentioned.

The strips are preferably fastened by wooden slats fastened in the corners formed by the plates and the strips (e.g. with a dimension of 25 χ 35 mm) connected to the panels. The ones that require the least amount of work The method for producing the bar structure consists in placing between two plates made of the above-mentioned material At the prescribed mutual distances, double-height battens are glued and then the Structures built in this way in the longitudinal direction in one operation exactly through the middle of the wooden slats sawed in two in this way a box-shaped strip structure of the prescribed length is obtained, e.g. 5 m.

The wood fiber material in question is known under the trade name "Masonite" and is used, inter alia, in the Dutch Patent 51565 described. Some mechanical-physical properties are in the report

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of the wood institute of TNO (institute for technical-scientific Research) No. H-70-84C, order number 8151/70, dated June 22, 1970 mentioned. It appears, that the mechanical-physical properties, especially the Ε-module, of this material differ from those of wood differ. The fact that this material meets the requirements of the construction standards is therefore special surprised. Until now, the expert was of the opinion that this was only possible with wood.

The material used has the further advantage over wood that it is significantly cheaper and moreover is affected only little or not at all by water, which is particularly important for roofs. Other great advantages are the homogeneity and the constant properties of the material.

In the drawing is an embodiment of an inventive Component shown.

Show it:

1 shows a cross section through the component;

2 shows a cross section through a box-shaped structure of strips for construction;

3 measurement results of an assembled construction according to the invention.

The following reference numbers are used:

1, an upper wood pulp board;

2 a lower wood pulp board;

3, 4 and 5 three box-shaped bar structures

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at a mutual distance of approx. 60 cm

measured from center to center; 6 and 7 strips of the box-shaped strip structure;

8 and 9 wooden slats;
10 saw cuts to form the individual

Inguinal structure 3, 4 and 5.

On a number arranged at the correct mutual distance Last structure 3, 4 and 5 (the production of which was described above) is a wood fiber board 2 attached by gluing and nailing or riveting. Then the construction is reversed and a wood fiber board 1 attached in a similar manner to the wood fiber board 2. The component is now ready. Important is, that the parts are not only glued, but also attached by nailing or riveting. A special Pressing equipment to maintain a good glue connection is therefore unnecessary, which saves work. Otherwise are other procedures are also not excluded. A suitable glue for this material is "Aerolite 308" (trademark from Ciba). Other types of leira with good adhesive strength are not excluded.

3 shows the measurement results of a component according to the invention intended for stream constructions. In this diagram, the size Q of a regularly distributed load in kg is free on the vertical axis and the greatest deflection 1 * ines 6300 mm long, on a horizontal axis at the end of the resting component in on. The dimensions are given in mm .

The results of components with i®a cross sections A ₉ B, C and D are given in the diagram trait uem lines a, fo _s c and ύ . From this diagram © rgifet SiCh ₉ «that the price-

-best construction B based on a masonite plate of 5 m with a regularly distributed load ν · η 2200 kg a maximum deflection of 60 mm shows what satisfies the norms.

The following is a cost comparison of components that are made with the help of laminated wooden beams and those according to the invention Strip systems are produced, indicated. Both elements have the same mechanical properties and are manufactured under the same operating conditions.

Cost with laminated with masonite Wooden box girders

Wood: 2.5 Ä 0.8 Ä

Hasonite: 0.7 A A Fasteners 0.1 A 0.2 A Labor costs: -.1x5. ^A -2x2-- Total: 4.8 A 2.7 A.

It should be noted that the width of the building elements can be increased by assembling several adjacent panels can be varied widely. Even narrow components, which while retaining the structural features as a passport or Transition pieces are used are within the scope of the invention.

The invention also relates to a building system for pitched roofs, which consists of one or more box-shaped Components with the features described above, the box-shaped components © ine length of at least 5 m, can rest on masonry or support structures at the ends of the long sides and in the width direction (if necessary in the direction of inclination of the pitched roof) lie against each other.

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Elements with shorter lengths and with the same design features according to the invention, but which are intended for higher loads, are also within the scope of the invention.

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Claims (7)

Patent claims: ( IJ Box-shaped building element as a carrier of a roof covering, which is formed from core parts and two outer walls each consisting of a single plate, whereby the core parts are made up of strips, the ends of which are each attached to an outer wall, characterized in that the outer walls of the building element consist of wood fiber boards (1,2) made from lignocellulose under pressure and at elevated temperature, which have a length of at least 5 m, a thickness of approx. 5 to 8 mm and the following mechanical-physical properties: 2 Flexural tensile strength 410 kp / cm E-module 42500 kp / cm ² Tensile strength parallel to Plate surface 230 kp / cm ² Tensile strength perpendicular to the Plate surface 7.5 kp / cm 2. Component according to claim 1, characterized in that that the wood fiber panels (1,2) at mutual distances of at least 20 cm through a system of one or two vertically on the wood pulp slats (1,2) fastened strips (6,7) made of the same material are held, with the system in the longitudinal direction the wood fiber panels (1,2) at mutual distances at least 40 cm (measured from center to center). 3 «component according to claims 1 to 2, characterized in that that the distance between the system of strips (6.7) is about 60 cm. 709819/0779 4. Component according to claims 1 to 3, characterized in that the strips (6,7) with the help fastened by in the corners formed by the wood fiber panels (1,2) and the strips (6,7) Wooden slats (8,9) are connected to the wood fiber panels (1,2). 5. Component according to claims 1 to 4, characterized in that two strips (6,7) with the wooden slats (8,9) are assembled into narrow box-shaped structures (3,4 or 5). 6. Construction system for pitched roofs made up of several connected Box-shaped structural elements according to Claims 1 to 5, characterized in that the box-shaped building elements have a length of 5 m, rest on masonry at the ends of the long sides and in the width direction (if necessary in the direction of inclination of the sloping roof) against each other lie. 7. A method for producing a component according to claims 1 to 5, characterized in that first Double-width battens are glued at the prescribed intervals between two panels and from the the construction obtained in this way then by dividing the slats in the longitudinal direction, the individual strip structures be generated.