EP0575268B1 - Baumaterial aus geschichtetem und verleimtem Holz - Google Patents

Baumaterial aus geschichtetem und verleimtem Holz Download PDF

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Publication number
EP0575268B1
EP0575268B1 EP93420246A EP93420246A EP0575268B1 EP 0575268 B1 EP0575268 B1 EP 0575268B1 EP 93420246 A EP93420246 A EP 93420246A EP 93420246 A EP93420246 A EP 93420246A EP 0575268 B1 EP0575268 B1 EP 0575268B1
Authority
EP
European Patent Office
Prior art keywords
bonded
layer
laminated
wood
slats
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93420246A
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English (en)
French (fr)
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EP0575268A1 (de
Inventor
Jean-Luc Sandoz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0575268A1 publication Critical patent/EP0575268A1/de
Application granted granted Critical
Publication of EP0575268B1 publication Critical patent/EP0575268B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E04C3/14—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with substantially solid, i.e. unapertured, web

Definitions

  • the present invention relates to a new type of wooden material of the glulam type, material which in the following description will be designated by the expression "beam”.
  • Wood as a building material, has the distinction of having very great variability in its mechanical properties since it it is a natural material. These properties are influenced, within each species, by geo-climatic parameters, by data silvicultural, or by processing characteristics. Moreover, the products derived from its transformation are limited in their geometry and in their volume. Lumber products rarely have a length greater than ten meters, with maximum sections of the order 180/300 cm, which therefore limits the area of use of such product.
  • the proposed solution according to the invention solves this problem improvement of the resistance of the beams by the fact that one obtains a reinforcement while keeping the initial rectangular section, without add material.
  • the material conforms to the invention comprises a single layer of glulam, glued thus in the vertical direction, the other layers being made up of lamellae glued horizontally, according to a variant conforming to the invention, a second layer of glulam reported in the direction vertical can be arranged at the top.
  • all of the material according to the invention consists entirely of layers of glulam arranged vertically and joined together by gluing.
  • the layer of glulam arranged in the vertical direction must include at least three elementary blades, to benefit from the stress redistribution effect of the most weak locally on the adjacent vertical slats (parallel effect), the increase in the number of vertical blades making it possible to decrease the resistance variability of the beams produced, and therefore to increase their reliability.
  • FIGS 1, 2 and 3 schematically illustrate the three embodiments of a glued laminated timber building material produced in accordance with the invention.
  • such a beam consists a conventional glued-laminated assembly (1), consisting of eleven parallel layers arranged horizontally and, glued in one direction vertical, of a layer (2) of a glulam comprising five lamellae and arranged in the most tense area, and therefore oriented in the direction where flexion is exercised.
  • the material according to the invention is in the form of a beam also of section rectangular, made up in its central part of a glulam conventional (1) comprising ten horizontal layers and, located on one side and on the other side of this central zone (1), of two layers (2) of glulam, glued vertically, and each consisting of five strips.
  • the variant illustrated in FIG. 3 of a material conforming to the invention consists only of layers (2) of glulam arranged vertically in the direction of bending.
  • Such a design makes it possible to obtain beams having values permissible resistance of 30 to 40% higher compared to beams made of classic glulam. We also get a evolution of the modulus of elasticity from 10 to 20% compared to standards from different countries.
  • the mechanical quality of the beam is further optimized in sorting the best blades that are preferably intended for blades vertical.
  • the material conforming to the invention it is necessary to have at least three blades in the glued laminated element arranged vertically in the stretched area.
  • blades about 25 mm thick should be used per example for making the element placed in the stretched area.
  • conventional planks 33 mm thick or more agree.
  • the reduction in thickness of the blades of the multi-bonded element placed in the stretched area is a parameter optimization in the sense that it increases the number of vertical blades and thus it reduces the variability of resistance of the beams.
  • the product conforms to the invention has another advantage which is that the values mechanical results, are valid for all sections. If the height of the section increases, in the case of a glued laminated product conventional, reducing coefficients are used to reduce admissible values, taking into account volume effects negative on the resistance of the beam (case of all serial systems). With the product according to the invention, there is no volume effect, for as much as the element placed in the stretched area, represents at least 15% of the section.
  • Such a material can be made from all types of wood and using conventional lamination techniques, techniques which will therefore not be described for simplification purposes. Properties mechanics of the beam will be deduced from the properties of the woods supply (fir, spruce, pine, larch, etc.).

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  • 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)
  • Laminated Bodies (AREA)
  • Finishing Walls (AREA)
  • Panels For Use In Building Construction (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Claims (5)

  1. Balkenartiges Bauelement mit rechteckigem Querschnitt, welches aus Lagen, bestehend aus verleimtem Schichtholz hergestellt ist, dadurch gekennzeichnet, daß
    es mindestens zwei übereinander liegende und miteinander verleimte Anordnungen (1,2) umfaßt, die jeweils aus einer Lage von mindestens drei Schichten (2a,2b) mit rechteckigem Querschnitt gebildeten, verleimten Schichtholzes bestehen, wobei die Schichten nebeneinander, ohne Versetzung zueinander angeordnet sind;
    es eine derartige Struktur aufweist, daß unter Berücksichtigung der Einwirkung einer Biegekraft auf den oberen Teil des genannten Elements wenigstens die äußere Lage (2), welche die untere und die am meisten gespannte Schicht bei dieser Biege-Beanspruchung darstellt, aus miteinander in vertikaler Richtung, nämlich der Biegungsrichtung, verleimten Schichten (2a,2b) besteht, die an die untere Fläche der an ihr angrenzenden Schicht geleimt sind.
  2. Bauelement nach Anspruch 1, dadurch gekennzeichnet, daß es eine einzige aus verleimten Schichten gebildete Lage (2), nämlich die untere Lage, aufweist, welche in vertikaler Richtung verleimt ist, wobei die andere Lage (1), nämlich die obere Lage, aus in horizontaler Richtung verleimten Schichten besteht.
  3. Bauelement nach Anspruch 1, dadurch gekennzeichnet, daß es zwei aus verleimten Schichten gebildeten Lagen (2), nämlich die untere und die obere, aufweist, welche in vertikaler Richtung verleimt sind und die jeweils auf einer Seite einer mittleren, aus horizontal verleimten Schichten bestehenden Lage (1) angeordnet sind.
  4. Bauelement nach Anspruch 1, dadurch gekennzeichnet, daß die Gesamtheit der aus verleimten Schichten gebildeten Lagen (1,2) vertikal angeordnet ist.
  5. Bauelement nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß jede der in vertikaler Richtung angeordneten aus verleimten Schichten gebildeten Lagen (2) mindestens drei Einzelschichten umfaßt.
EP93420246A 1992-06-16 1993-06-15 Baumaterial aus geschichtetem und verleimtem Holz Expired - Lifetime EP0575268B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9207544A FR2692301B1 (fr) 1992-06-16 1992-06-16 Materiau de construction a base de bois lamelle-colle.
FR9207544 1992-06-16

Publications (2)

Publication Number Publication Date
EP0575268A1 EP0575268A1 (de) 1993-12-22
EP0575268B1 true EP0575268B1 (de) 1998-03-25

Family

ID=9430982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420246A Expired - Lifetime EP0575268B1 (de) 1992-06-16 1993-06-15 Baumaterial aus geschichtetem und verleimtem Holz

Country Status (4)

Country Link
EP (1) EP0575268B1 (de)
AT (1) ATE164412T1 (de)
DE (1) DE69317600T2 (de)
FR (1) FR2692301B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0939177B1 (de) 1998-02-26 2004-01-14 Kaufmann Holz AG Balkenartige Schwelle für Holzständerbaukonstruktionen
BE1015492A5 (fr) 2002-09-27 2005-05-03 Ronveaux E Ets Sa Poutre composite en bois lamellee collee.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2118048A (en) * 1937-03-29 1938-05-24 Timber Engineering Co Laminated structure
DE897622C (de) * 1946-09-07 1953-11-23 Gottfried Kaempf Verleimter Holztraeger
US2886857A (en) * 1953-12-14 1959-05-19 Hyresgaesternas Sparkasse Och Wooden beam constructions
DE1103551B (de) * 1957-08-26 1961-03-30 Josef Wolff Holztraeger mit mindestens drei miteinander verleimten Stegschichten
US3170198A (en) * 1960-06-22 1965-02-23 Eliot I Snider Wooden i-beam
CH461753A (de) * 1965-08-18 1968-08-31 Wiesner Erich Dipl Ing Dr Tech Grossbauelement für schwere Holzkonstruktionen, insbesondere Hallenbinder
US3445325A (en) * 1966-08-22 1969-05-20 Us Agriculture Laminated wood beam with improved preservative treatment

Also Published As

Publication number Publication date
ATE164412T1 (de) 1998-04-15
FR2692301A1 (fr) 1993-12-17
FR2692301B1 (fr) 1999-01-15
EP0575268A1 (de) 1993-12-22
DE69317600T2 (de) 1998-07-09
DE69317600D1 (de) 1998-04-30

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