EP0575268B1 - Matériau de construction à base de bois lamelle-colle - Google Patents
Matériau de construction à base de bois lamelle-colle Download PDFInfo
- 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
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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.).
Description
- il comporte au moins deux ensembles, superposés et collés entre eux, constitués chacun d'une couche lamellée-collée formée d'au moins trois lames de section rectangulaire, juxtaposées côte à côte sans décalage les unes par rapport aux autres ;
- il a une structure telle que, si l'on considère qu'une force de flexion s'exerce à la partie supérieure dudit élément, au moins la couche externe qui est la couche inférieure et la plus tendue lors de ce travail en flexion, est constituée de lames recollées entre elles dans le sens vertical qui est le sens de la flexion, et collées contre la surface inférieure de la couche qui lui est adjacente.
Claims (5)
- Elément de construction, du type poutre, présentant une section rectangulaire, réalisé à partir de couches de bois lamellé-collé, caractérisé en ce que :il comporte au moins deux ensembles (1,2), superposés et collés entre eux, constitués chacun d'une couche lamellée-collée formée d'au moins trois lames (2a,2b) de section rectangulaire, juxtaposées côte à côte sans décalage les unes par rapport aux autres ;il a une structure telle que, si l'on considère qu'une force de flexion s'exerce à la partie supérieure dudit élément, au moins la couche externe (2) qui est la couche inférieure et la plus tendue lors de ce travail en flexion, est constituée de lames (2a,2b) recollées entre elles dans le sens vertical qui est le sens de la flexion, et collées contre la surface inférieure de la couche qui lui est adjacente.
- Elément de construction selon la revendication 1, caractérisé en ce qu'il comporte une seule couche (2) de lamellé-collé, la couche inférieure, recollée dans le sens vertical, l'autre couche (1), la couche supérieure, étant constituée de lamelles recollées dans le sens horizontal.
- Elément de construction selon la revendication 1, caractérisé en ce qu'il comporte deux couches (2) de lamellé-collé, les couches inférieure et supérieure, recollées dans le sens vertical, disposées de part et d'autre d'une couche centrale (1) constituée d'un lamellé-collé horizontal.
- Elément de construction selon la revendication 1, caractérisé en ce que la totalité des couches de lamellé-collé (1,2) est disposée verticalement.
- Elément de construction selon l'une des revendications 1 à 4, caractérisé en ce que chaque couche de lamellé-collé (2) disposée dans le sens vertical, comporte au moins trois lames élémentaires.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9207544 | 1992-06-16 | ||
FR9207544A FR2692301B1 (fr) | 1992-06-16 | 1992-06-16 | Materiau de construction a base de bois lamelle-colle. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0575268A1 EP0575268A1 (fr) | 1993-12-22 |
EP0575268B1 true EP0575268B1 (fr) | 1998-03-25 |
Family
ID=9430982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93420246A Expired - Lifetime EP0575268B1 (fr) | 1992-06-16 | 1993-06-15 | Matériau de construction à base de bois lamelle-colle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0575268B1 (fr) |
AT (1) | ATE164412T1 (fr) |
DE (1) | DE69317600T2 (fr) |
FR (1) | FR2692301B1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE257885T1 (de) | 1998-02-26 | 2004-01-15 | 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)
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 |
-
1992
- 1992-06-16 FR FR9207544A patent/FR2692301B1/fr not_active Expired - Fee Related
-
1993
- 1993-06-15 DE DE69317600T patent/DE69317600T2/de not_active Expired - Fee Related
- 1993-06-15 AT AT93420246T patent/ATE164412T1/de not_active IP Right Cessation
- 1993-06-15 EP EP93420246A patent/EP0575268B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69317600T2 (de) | 1998-07-09 |
DE69317600D1 (de) | 1998-04-30 |
FR2692301A1 (fr) | 1993-12-17 |
ATE164412T1 (de) | 1998-04-15 |
EP0575268A1 (fr) | 1993-12-22 |
FR2692301B1 (fr) | 1999-01-15 |
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