DE10161024A1 - Laminar beam of trapezoid-section strips has identical triangular strips placed asymmetrically, with no common cut point - Google Patents

Abstract

The laminar beam (11) is made up of trapezoid-section strips. The identical triangular-section strips are placed asymmetrically so that they have no common cut point. The large parallel side is always in the immediate vicinity of the round timber jacket surface, and from there on out, the center verticals of the strips are laide to form the beam width (B).

Description

State of the art

DE 28 49 757 A1 describes a process for the production of boards from ver glued packages, of which the panels are parallel and also transverse to the longitudinal fiber direction are sawn off. A solution for lamellas and the quality assurance of the slat lengths (error capping and finger joint kung) is not shown.

WO 89/04747 describes round log radial cuts with repeated loading pull to the center of the roundwood geometry and from that the corresponding single piece formations. This system is only the same moderately round wooden sections with a precisely centered, small core range of healthy wood is practicable.

DE 692 26 540 T2 describes a method for producing the same angled, equilateral triangles, with the integration of paralle len wooden parts / plates for the inner triangle tips the distance to the core area is achieved. With this procedure be any package cross-sections formed for any slicing; for her This method is not suitable for long bars.

DE 196 13 237 C2 describes the beginning of the procedures with the Forming the log into an octagon, and then the right angle to create triangular slats. A solution for creating a Octogons on oval and curved sections and for core-free La Mell with optimal yield, as well as for meaningful reaching of the bars heights is not shown.

DE 101 35 123 A1 shows solutions for optimal yield and Quality assurance and also for pressing to achieve the of beam heights to be sawn off a carpet. With the methods of DE 101 35 123 A1 but it is not possible to make optimal use of strong logs. It is absolutely necessary for quality assurance, the tips of the triangular slats clearly designed to be free of core areas; it follows that the star  Cutting or halving methods are not at the center of the round wood, but refer to the location of the core area must be taken. DE 10 13 5123 A1 sees this essentially Chen, but no solution is shown like the large slats widths of large log diameters are to be avoided. A log braid diameter of z. B. 50 cm would with a core area offset of 60 mm lead to a slat width of over 280 mm; and for such La There is no market for panel widths, and the panel width halving - or the B halving of already compressed beams - would be the case with internal Trigger logistics multicomplex processes.

DE 10 15 4269 A1 describes solutions to avoid core cores lamellar tips with a high load, and the included cutting out of a log centerpiece also contributes to that in the heavy wood area Avoid wide slat widths for large bar widths that are not in demand that will. However, the division of the circle described here leads cut-shaped half-timber (or the repeated setting of an agent piece in the middle of the half-timber) to an extreme symmetry loss of radial and tangential structures in relation to the fins geometry.

All systems in which the entire log surface is made up of triangular pieces sawn and divided into symmetry, bring in a figure a high yield, but they are ultimately because of the most different Round wood shapes and different core areas are not practical bel.

invention

It is always assumed that the triangular lamellas ( 4 ) are free of core areas, and that this is achieved when cutting the logs ( 1 ) by cutting out center pieces ( 2 ). (This method is - see Fig. 1 - not part of the claims.)

In the system according to the invention, the lamella formations and placements are no longer oriented in the symmetry of a common intersection ( 5 ) or no longer at the tip of a segment ( 3 ).

Practice or the market essentially requires slats for seven ver Different bar widths (B), with approx. 75% of all bars on only 3 slurries related. With logs of z. B. 30 to 50 cm es it is symmetrical triangular lamella placement in no way and not even  the slat sizes for the beam center of gravity widths are approximately possible provide.

The asymmetrical placements according to the invention enable a large number of long and short perpendicular perpendicular lengths ( 8 ) for all round timber diameters - without losses in yield - and thus an adaptation to the beam widths actually required (B).

The asymmetrical lamella placement according to the invention also offers the possibility of essentially aligning the radial and tangential structures ( 9 ) with the core area ( 10 ).

Descriptions of the figures

Fig. 1 shows logs ( 1 ) and various subdivisions with middle pieces ( 2 ) to segments ( 3 ) and their uses in a symmetrical manner with a common intersection ( 5 ).

Fig. 2 shows different asymmetrical divisions with different middle perpendicular lengths ( 8 ) and without a common intersection ( 5 ).

Fig. 3 shows a finished trapezoidal lamella bar ( 11 ) with the bar width B and dash symbols for further bar widths.

Claims (4)

1. Trapezoidal lamella forms and methods therefor, or methods for the production of trapezoidal lamella beams ( 11 ), for which core-area-related parallel pieces ( 2 ) are sawn out of the round timbers ( 1 ) and the circularly shaped half timbers ( 3 ) - or the segments ( 3 ) generated therefrom be divided into a plurality of triangular lamellae ( 4 ) or trapezoidal lamellae ( 4 ), characterized in that the isosceles three corner lamellae ( 4 ) are placed asymmetrically and do not have a common intersection ( 5 ). 2. Form and method according to 1, characterized in that the large parallel side ( 6 ) is always placed in the immediate vicinity of the round wooden surface ( 7 ), and from there the trapezoidal lamellar perpendicular ( 8 ) is applied to the beam width (B). 3. Form and method according to 1 to 2, characterized in that trapezoidal lamellae ( 4 ) with different central perpendicular lengths ( 8 ) are placed within a segment ( 3 ). 4. Shape and method according to 1 to 3, characterized in that the radial and tangential structures ( 9 ) on the core area ( 10 ) are directed.