EP3516128B1 - Hohles längliches bauelement - Google Patents

Hohles längliches bauelement Download PDF

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Publication number
EP3516128B1
EP3516128B1 EP17768472.7A EP17768472A EP3516128B1 EP 3516128 B1 EP3516128 B1 EP 3516128B1 EP 17768472 A EP17768472 A EP 17768472A EP 3516128 B1 EP3516128 B1 EP 3516128B1
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EP
European Patent Office
Prior art keywords
construction element
strips
element according
section
hollow
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Application number
EP17768472.7A
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English (en)
French (fr)
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EP3516128A1 (de
Inventor
Patrick Moutschen
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Individual
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Individual
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
    • E04C3/127—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with hollow cross section
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
    • E04C3/122—Laminated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
    • B27B1/005—Methods for subdividing trunks or logs essentially involving sawing including the step of dividing the log into sector-shaped segments

Definitions

  • the present invention relates to an elongate hollow composite wood construction element optimized in terms of its mechanical strength.
  • the construction elements must be as light as possible in order to reduce energy and therefore the costs associated with their transport and implementation.
  • Solid composite timber construction elements have already been improved in terms of mechanical strength.
  • the patent GB 781,627 discloses a composite wood beam composed of pairs of longitudinal slats with triangular or trapezoidal cross-section juxtaposed and inverted, the slats having been obtained by radial cutting in logs.
  • the resistance of the beam is improved by placing in its zones most subjected to bending, that is to say upper and lower, wood obtained at the periphery of the logs. This wood, younger and with a greater density of rings, is more resistant.
  • the patent EP 1277552 B1 relates to a method of manufacturing composite beams made up of pairs of longitudinal lamellae with only trapezoidal section juxtaposed and inverted.
  • the patent US 5816015 also relates to a process for manufacturing composite beams which is limited to strips of triangular section.
  • the documents EP0069121 , WO8002709 , WO9517565 and NL1017360 refer to elongated hollow building elements, such as masts, piles or sleepers, which have a polygonal or circular cross section.
  • the demand NL8004909 it relates to a building element of comparable appearance which, in particular, is capable of retaining its rectilinear shape and can therefore find an application in the construction sector. If these elements as shown appear to have acceptable rigidity, their mechanical strength can be improved.
  • An object of the invention is to provide an elongated construction element made of composite wood which is optimized in terms of its mechanical characteristics in order to produce efficient and functional constructions.
  • Another object of the invention is to provide an element of economic construction falling within the framework of sustainable development.
  • the construction element of the invention is made of composite wood and is hollow. It has a polygonal peripheral structure around the hollow. Each side of this polygonal peripheral structure is formed by at least one pair of elongated lamellae with a triangular or trapezoidal cross section juxtaposed and inverted with respect to one another.
  • the polygonal peripheral structure also has abutment means in the form of strips in its corner areas. The different lamellae, which were obtained by radial cutting in logs, are glued to each other.
  • a hollow element saves material in its central zone (close to the neutral axis), where this does not contribute or only slightly to the rigidity, which is determined by the quadratic moment of inertia influenced by the geometry of the cross section, and therefore by the resistance of the beam.
  • a hollow element is obviously lighter, which saves transport and handling costs. It therefore has a smaller ecological footprint.
  • a hollow construction element allows utility conduits such as cables and electric wires or pipes to pass inside the element, which reduces the bulk of these utility conduits and further allows them to be concealed.
  • the material is pushed back to the periphery of the beam, where it is more efficient mechanically, because the beam is there the most stressed. in flexion.
  • This material is also particularly resistant due to its particular structure comprising elongated lamellae with triangular or trapezoidal cross section juxtaposed and inverted with respect to one another. These slats resulting from radial cuts in logs are very resistant mechanically due to their high content of young, denser and therefore more resistant wood located at the base (in the case of a triangular section) or at the base. large base (in the case of a trapezoidal section).
  • the rings are oriented uniformly with respect to the cutting planes, which means that the wood thus obtained exhibits less variability or standard deviation in its mechanical characteristics (under certain classification / purging conditions imposed) than that obtained by conventional rectangular cuts. Consequently, less security may be adopted when defining the resistance values to be used for the sizing of the corresponding construction elements. This will result in higher resistance values, which will save raw material.
  • the resistance values of European standard EN 338 which provides the characteristic values of wood as a function of the species, can be increased by around 15 to 20%.
  • slats obtained by radial cuts are less prone to warping due to shrinkage of the wood during drying, which reduces any subsequent planing of the wood.
  • radial cutting of logs results in less waste and is therefore more economical.
  • the construction element of the invention is therefore optimized both in terms of the geometry of the cross section (hollow) and strength of composite wood to make it both very strong and light.
  • the construction element according to the invention is configured as a beam or column.
  • the building element according to the invention has a constant cross section over its entire length.
  • the polygonal peripheral structure of the construction element according to the invention is quadrilateral.
  • it is rectangular.
  • a rectangular geometry allows an easier implementation.
  • the abutment means of the construction element according to the invention are lamellae with triangular or trapezoidal cross section and comprise in each corner zone a central elongated lamella and at least one elongated lamella forming stop placed on either side of the central slat.
  • the cross sections of the central sipe and those of the stop sipes are oriented to produce a cone effect. This arrangement makes it possible to induce by the cone effect in the corner zones a strong tightening of the different lamellae during their bonding and consequently to increase the mechanical resistance of the construction element.
  • the central lamella and the lamellae forming a stopper have a trapezoidal cross section.
  • the large base of the central lamella and the small base of the stop lamellae are turned towards the hollow of the construction element.
  • the Fig. 1 shows a hollow composite wood construction element 1 configured as a beam with a constant rectangular cross section along its length.
  • the beam 1 also has a rectangular peripheral structure 3 around the hollow.
  • the structure 3 as illustrated is formed of five elongated slats 5 (i.e. 2.5 pairs) with trapezoidal cross section juxtaposed, inverted and glued for the length of the peripheral structure, and of 3 slats 5 (i.e. 1.5 pairs) for its width.
  • a contiguous means 11 makes it possible to connect the strips 5 longitudinally.
  • the rectangular peripheral structure 3 has abutment means in each of its corner zones. These comprise in each of these zones a central elongated strip 7 with trapezoidal section and on either side of the latter an elongated strip forming a stop 9 also with trapezoidal section. It is necessary to note that the trapezoids of the slats 9 are reversed with respect to that of the slat 7 and are oriented so as to produce a cone effect in each corner zone: the small bases of the slats 9 and the large base of the slat 7 are facing the hollow of the beam 1.
  • the function of the slats 7,9 configured in the corner zones is to promote the bonding of the slats 5,7,9 constituting the beam 1.
  • a pressure is generated by pressure chambers (not shown) in the hollow of the beam 1 to be assembled and acts on all of its strips 5,7,9 retained for example by strapping (not shown).
  • This pressure then induced by the cone effect in the corner zones of significant reaction forces and consequently a strong clamping on the faces of all the strips 5, 7 and 9.
  • This clamping ensures a particularly efficient bonding. of the assembly, which reinforces the mechanical resistance of the beam 1.
  • the different slats 5,7,9 are obtained by radial cutting in logs.
  • Other abutment means could of course be imagined, without departing from the scope of the present invention.
  • the slats 9 can for example be divided into 2 slats of smaller dimension.
  • the Fig. 2 illustrates the advantages associated with this cut.
  • a log 13 undergoes three different cuts.
  • conventional non-radial cuts 17 and 19 are made around the pith and midway between the pith and the bark, respectively.
  • the cutout 17, unlike the radial cutout 15, has the dual mechanical disadvantage of containing relatively a lot of old wood, because of the marrow, and therefore much less resistant, and to present rings whose orientation is opposite.
  • the non-radial cutouts 17 and 19 warp on shrinkage during drying, which is not the case with the radial cutout 15. This warping is disadvantageous because it involves subsequent machining and therefore loss of material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (7)

  1. Hohles längliches Bauelement (1) aus Verbundholz, das eine polygonale Umfangsstruktur (3) um den Hohlraum herum aufweist, dadurch gekennzeichnet, dass jede Seite der polygonalen Umfangsstruktur (3) von mindestens einem Paar von länglichen Lamellen (5) mit dreieckigem oder trapezförmigem Querschnitt gebildet wird, die nebeneinander gelegt und relativ zueinander umgekehrt angeordnet sind, und dass die polygonale Umfangsstruktur (3) außerdem Aneinanderfügungsmittel in Form von Lamellen (7, 9) in ihren Winkelbereichen aufweist, wobei die verschiedenen Lamellen (5, 7, 9), die durch radiales Schneiden in Stammhölzer (13) erhalten wurden, aufeinander geleimt sind.
  2. Bauelement nach Anspruch 1, dadurch gekennzeichnet, dass es wie ein Balken oder eine Säule gestaltet ist.
  3. Bauelement nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass es über seine gesamte Länge einen konstanten Querschnitt aufweist.
  4. Bauelement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die polygonale Umfangsstruktur viereckig ist.
  5. Bauelement nach Anspruch 4, dadurch gekennzeichnet, dass die polygonale Umfangsstruktur rechtwinklig ist.
  6. Bauelement nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Aneinanderfügungsmittel in Form von Lamellen (7, 9) von einem dreieckigen oder trapezförmigen Querschnitt sind und in jedem Winkelbereich eine mittige längliche Lamelle (7) und mindestens eine längliche, einen Anschlag bildende Lamelle (9) umfassen, die auf beiden Seiten der mittigen Lamelle (7) angeordnet ist, wobei die Querschnitte der mittigen Lamelle (7) und die der einen Anschlag bildenden Lamellen (9) so ausgerichtet sind, dass eine Konuswirkung erzeugt wird.
  7. Bauelement nach Anspruch 6, dadurch gekennzeichnet, dass die mittige Lamelle (7) und die einen Anschlag bildenden Lamellen (9) von trapezförmigem Querschnitt sind und dass die große Grundseite der mittigen Lamelle (7) und die kleine Grundseite der einen Anschlag bildenden Lamellen (9) dem Hohlraum des Bauelementes (1) zugewandt sind.
EP17768472.7A 2016-09-26 2017-09-21 Hohles längliches bauelement Active EP3516128B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2016/0151A BE1024604B1 (fr) 2016-09-26 2016-09-26 Element de construction allonge creux
PCT/EP2017/073924 WO2018055043A1 (fr) 2016-09-26 2017-09-21 Elément de construction allongé creux

Publications (2)

Publication Number Publication Date
EP3516128A1 EP3516128A1 (de) 2019-07-31
EP3516128B1 true EP3516128B1 (de) 2020-11-04

Family

ID=57208003

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17768472.7A Active EP3516128B1 (de) 2016-09-26 2017-09-21 Hohles längliches bauelement

Country Status (6)

Country Link
US (1) US20210277656A1 (de)
EP (1) EP3516128B1 (de)
JP (1) JP2019533100A (de)
BE (1) BE1024604B1 (de)
CA (1) CA3034167A1 (de)
WO (1) WO2018055043A1 (de)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB781627A (en) 1955-06-28 1957-08-21 Gottfried Esser Improvements in or relating to composite wooden beams
US4394409A (en) * 1977-09-22 1983-07-19 Weyerhaeuser Company Composite wood article and method of manufacture
NO150525C (no) 1979-05-31 1992-02-11 Hallvard Berge Trestolpe for kraftlinjer eller liknende, samt maskin forfremstilling av samme
SE418775B (sv) 1980-07-18 1981-06-22 Aos Metall Mek Verk Sett och anordning for att eliminera obehag fororsakande flimmer vid betraktande av rontgenfilm i ljusskap
NL8004909A (nl) * 1980-08-29 1982-04-01 Petrus Johannus Maria Meegdes Holle houtconstructie.
US5438812A (en) 1993-12-23 1995-08-08 Regents Of The University Of Minnesota Hollow veneered pole
US5865929A (en) * 1995-06-21 1999-02-02 Sing; Peter Method of producing laminated wood beams
DE19613237C2 (de) * 1996-04-02 1999-06-02 Kirst Ralph Dipl Ing Fh Balken und Verfahren zu dessen Herstellung
NL1017360C2 (nl) 2001-02-14 2002-08-15 Leonardus Anthonius Ligtenberg Schip voorzien van een hol rondhout.
EP1277552B1 (de) 2001-07-19 2006-05-03 Fries, Petra Verfahren und Einrichtungen zum Einschnitt und zur Profilierung von Trapezlamellen für Trapezlamellenbalken
SE538283C2 (sv) 2014-08-08 2016-04-26 Stora Enso Oyj A gluelam structural member and a method of producing such a gluelam structural member

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
US20210277656A1 (en) 2021-09-09
EP3516128A1 (de) 2019-07-31
BE1024604B1 (fr) 2018-04-25
JP2019533100A (ja) 2019-11-14
BE1024604A1 (fr) 2018-04-18
WO2018055043A1 (fr) 2018-03-29
CA3034167A1 (fr) 2018-03-29

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