DE102008004091B4 - Composite carrier for high mechanical loads and method for producing such carriers - Google Patents

Abstract

The invention relates to composite beams (1, 30, 40) for high mechanical loads and to a method for producing such beams (1, 30, 40) on the basis of glued laminated wood formation (14) comprising at least one lamella (2, 3, 4 , 5, 6, 7, 8, 9, 10, 18) of natural wood and of at least one reinforcing lamella (11, 12, 13) provided as cover lamella, the lamella (2, 3, 4, 5, 6, 7, 8, 9, 10, 18) of natural wood has a thickness d such that it optionally represents a square timber (18) or a board lamella (2, 3, 4, 5, 6, 7, 8, 9, 10). The object is to increase the flexural strength, rigidity and durability of the composite beam and timber and glulam components made therefrom. The solution is that at least in a zone (15) of high mechanical stress, the reinforcing lamella (12, 13) in its entirety formed as a synthetic resin press lamella or the reinforcing lamella (11) is at least partially provided with at least one synthetic resin press lamella and as a layer of plywood training ( 14) is connected to a lamella (2, 9, 10, 18) of natural wood, wherein the Kunstharzpressholzlamelle (12, 13, 19) consists of compacted Kunstharzgetränkten veneers, the resin impregnated, compacted veneers depending on the application different degrees of infiltration - by penetrated or injected liquid and then cured resin - and depending on the application different degrees of compression V with V = 0.4 to 0.9, wherein the degree of compaction V is defined as the ratio between veneer lumber thickness dFnV after compression and veneer lumber thickness dFvV before compression and the au fgewendete and predetermined compression pressure pV is in a range of 3 MPa to 10 MPa.

Description

The invention relates to a composite support for high mechanical loads and a method for producing such supports based on glued laminated wood formation.

Such composite beams can preferably be used for new constructions and for the renovation of existing bending beams made of wood.

Wood is a brittle material whose strength, in particular the tensile strength, both natural defects, such. B. by branches, as well as due to compounds such. B. of finger jointing, is significantly reduced. The resulting large variations in the tensile and flexural strengths mean that only a fraction of the strength of the faultless wood may be used in the design of load-bearing structural elements made of wood.

In addition, it comes as a result of the relatively low modulus of elasticity of the wood to large deflections of bending beams at high mechanical stress.

In timber construction, spruce wood is primarily used, but because of its low durability it is not well suited for outdoor use. Therefore, these wooden components are to be protected from direct weathering, z. B. by constructive measures or paints, etc.

The mechanical properties of wood, in particular glued laminated timber - BSH, can be classified by its sorting. In the case of glued laminated timber, this means that high-quality, higher-strength board lamellae are laid in highly stressed areas - tensile and / or pressure zones of bending beams. These so-called combined glulam beams have a higher strength and rigidity compared to unsorted beams.

Problems are that in the production of a combined glulam the sorting of the board slats is relatively expensive. In addition, the sorted, high-strength board lamellae still have to be finger-jointed, which in turn leads to lower strengths.

A carrier with a plywood training is in the publication EP 1 199 140 A2 described in which a wood composite beam formed as a carrier consists of glued layers, which are each blended and interrupted in the same layer plane.

One problem is that the layers are discontinuous and thus reduce the stability and flexural, tensile and / or compressive strength of the entire carrier under high mechanical stress.

There are composite beams with a plywood training in the document WO 96/08366 A1 whose bending strengths are also increased by the application of high-strength and high modulus fiber-reinforced plastic lamellae in the bending zone.

The disadvantages of the glass, aramid or carbon fiber reinforced composite beams are the low efficiency of the reinforcement and the high price of the reinforcing blades. Although the reinforcement has a high strength, but can not be exploited due to the rigidity ratios. In addition, for reasons of fire protection, the reinforcing lamellae are to be covered with a wooden lamella. As a result, the reinforced beams have only a slightly higher load capacity and rigidity. Decisive for the failure of the carrier remains the lack of tensile strength of the wood.

A wooden composite made of board lamellae in plywood training is in the publication US 6,050,047 A described, wherein the individual layers, the z. B. Douglas fir, have longitudinal recesses in which reinforcing elements are introduced.

One problem is that the reinforcing elements do not act over the entire width of the layer stack, so that only a slight improvement in flexural strength is achieved. In addition, only after the onset of the reinforcing elements and the formation of the layer stack is a pressing of the entire layer stack, which requires a larger energy input.

The invention has for its object to provide a composite support for high mechanical loads and a method for producing such carriers, which are designed such that the flexural strength, rigidity and durability of the composite support and made of wood and glulam components made therefrom are increased.

The object is solved by the features of claims 1 and 12. In the composite carrier for high mechanical loads on the basis of glued plywood training
consists according to the characterizing part of patent claim 1
the plywood formation from at least one lamella of natural wood and from at least one reinforcing lamella provided as cover element,
the lamella of natural wood having a thickness such that it optionally represents a squared lumber or a board lamella, and
wherein at least in a zone of high mechanical stress, the reinforcing blade is formed in its entirety as a Kunstharzpressholzlamelle or at least partially provided with at least one Kunstharzpressholzlamelle and is connected as a layer of plywood formation with a terminal lamella of natural wood, the Kunstharzpressholzlamelle consists of compacted Kunstharzgetränkten veneers.

The adjacent and stratified stacked board lamellae can have at least one synthetic resin press lamella as reinforcing lamella on / in their glued laminated wood structure.

On both sides of the center axis spaced at least one on / introduced Kunstharzpressholzlamelle be present as a cover plate on / in the Brettlamellen-plywood training.

The reinforcing lamella can, depending on requirements over the entire composite beam component length l or / but only a part of synthetic resin press, for. B. in a mechanically highly stressed zone - in the region of the maximum bending moment, wherein the less stressed / n zone / n of the reinforcing lamella consist of at least one lamella part of natural wood, which are glued by means of finger jointing or Schäftung with the synthetic resin press lamella.

Depending on the application, the resin-impregnated veneers have different degrees of impregnation - due to the penetration or injection of liquid and later hardened resin.

Depending on the application, the veneers have different degrees of compaction V with V = 0.4 to 0.9, the _degree of compaction V being defined as the ratio between veneer _layer wood _thickness d _FnV after pressing and veneer _layer wood _thickness d _FvV before the compression and the applied and predetermined compression pressure p _{V is} in a range of 3 MPa to 10 MPa.

The uncompressed veneers may have a thickness d _FvV in a range of 1 mm to 5 mm.

The fiber orientation of the compacted veneers is parallel to the fiber orientation of the lamellae of natural wood or the board lamellae and thus parallel to the direction of the main stress.

Depending on requirements, one to two veneer layers can be oriented perpendicular to the fiber orientation of the lamellae of natural wood or the board lamellae for stiffening the plywood formation.

The number k with k = 1, 2... N and the thickness d of the lamellae of natural wood in the form of board lamellae used for plywood training can be arbitrary, the thickness d of a board lamella being between 2 cm and 5 cm. Board slats of greater thickness may be referred to as solid wood or squared timber.

A symmetrical cross-section of the plywood formation can be formed with synthetic resin _{press lamellae} provided on _{both sides} with the same thickness d _FnV and designed as cover lamellae.

The veneers of the synthetic resin press lamellae may consist of coniferous and hardwood, preferably of beech wood.

The lamellae of natural wood and the reinforcing lamellae can be laminated to form a cross-section, whereby a glue that is compatible with natural wood and synthetic resin can be used.

In the process for the production of composite supports for high mechanical loads on the basis of glued laminated wood formation according to the characterizing part of claim 12
Lamellae of natural wood and at least one reinforcing lamella with a synthetic resin press lamella or at least one reinforcing lamella layered as a Kunstharzpressholzlamelle and then glued the final layering for plywood formation, the reinforcing lamella at least in the mechanically highly stressed zones -. B. tensile zone, pressure zone or compression and tension zone - is attached as a cover plate of the plywood training,
wherein prior to the final layering, the veneers of the attached synthetic resin press lamella are impregnated with synthetic resin and compacted.

During the period of the gluing of the laminated wood formation with the synthetic resin press lamellae, a predetermined compression pressure is exerted on the plywood formation.

The compression pressure on the composite beam in the final plywood formation can be produced by mechanical or hydraulic presses or by screw pressing.

According to the invention, therefore, the reinforcing fins are in the mechanically highly stressed areas of a Biegeverbundträgers - the tension zone, pressure zone or pressure and tension zone - arranged. Similar to the manufacturing process of glued laminated timber according to the prior art, board lamellae and reinforcing lamellae are laminated to one another glued to the intended cross-section.

Due to the layered gluing of veneers and their compaction, synthetic resin pressed wood has a high modulus of elasticity and very high strengths. The additional impregnation of veneers with synthetic resins makes the material dimensionally stable and durable.

In comparison with prior art fiber-reinforced bending beams, the reinforcing effect of the synthetic resin pressed-wood lamellae is markedly higher since the high flexural rigidity - large cross-sectional area - does not cause it to delaminate. When the outer board lamellae fails, the stresses in the reinforcing lamella are redistributed until their tensile strength is also reached.

The essential innovation of the invention is the combination of amplification and protection function. The reinforcement of wooden components takes place with high-strength and at the same time durable coating materials of impregnated and compacted veneers. Due to the good mechanical and structural-physical material properties of the synthetic resin press lamellae, in addition to a considerable increase in rigidity and load capacity, an improvement in the durability of the composite support is achieved. Since the reinforcing lamellae to be applied are wood-based materials in the narrower sense, approved conventional glues from wood construction can also be used for bonding the composite carrier. Production of the composite carrier according to the invention, which is also referred to as a hybrid carrier, in the conventional and largely automated process of glulam production is therefore readily possible, which should open up wide market opportunities for use in engineering timber construction. The further processing (joinery, coating, etc.) can be carried out with largely conventional processes in timber construction. A special compensation of tools or complex adaptation of paint systems is not required.

The invention will be explained in more detail with reference to several embodiments by means of drawings: It shows

1 an isometry of a symmetrically constructed first composite beam made of glulam wood in plywood formation with reinforcement lamellae of synthetic resin pressed wood designed as cover lamellae in a loading zone,

2 a cross-section of the symmetrically constructed first composite beam made of glulam with designed as cover slats reinforcing fins made of synthetic resin after 1 .

3 a cross-section of an asymmetrically constructed second composite beam of solid wood or squared timber with a formed as a cover plate reinforcing blade made of synthetic resin pressed wood and

4 an isometric view of an asymmetrically constructed third composite beam made of glulam with a cover plate designed as a reinforcing fin, wherein the middle region of the cover plate consists of a synthetic resin press lamella in the loading zone, on both sides conventional planks of natural wood are tined or angeschäftet in a connection.

The following are the 1 and 2 considered together 1 and 2 is a composite carrier 1 for high mechanical loads based on glued laminated wood construction 14 shown.

According to the invention there is the plywood training 14 from several slats 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 natural wood and each provided as a cover slat reinforcement slat 12 . 13 , where the slats 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 natural wood have a thickness d such that they represent board blades, and wherein the reinforcing blades 12 . 13 at least in one zone 15 high mechanical stress as a synthetic resin press lamella 12 . 13 are formed and as further layers of plywood training 14 each with a lamella 2 . 10 natural wood are connected, the synthetic resin press lamellae 12 . 13 consist of compacted, resin impregnated veneers.

The adjacent and stratified stacked board blades 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 with the thickness d point thus each end to the front sides of the plywood of glued plywood training 14 at least one synthetic resin press lamella 12 . 13 as a reinforcing lamella.

Thus, spaced on both sides to the center axis 17 of the composite carrier 30 at the last board lamella 2 . 10 the board lamella plywood education 14 an attached synthetic resin press lamella 12 . 13 to be available. The reinforcement blades 12 . 13 put in 1 and 2 the plywood education 14 protective cover slats dar.

Formed as reinforcing fins synthetic resin press wood slats 12 . 13 can, as in 1 is shown in mechanically highly stressed zones 15 - An intended tensile zone, pressure zone or pressure and tension zone - be arranged.

The reinforcing blades made of compacted synthetic resin press layers 12 . 13 with a thickness d _FvV consist of veneers, which depending on the application different degrees of impregnation - by penetrated or injected liquid and later hardened resin - and are additionally compressed during Ver-sizing / pressing up to 60% by a predetermined compression pressure.

The veneers are used in their resin impregnated and compacted state for reinforcement and protection against harmful environmental factors.

The board slats 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 and reinforcing blades 12 . 13 are, as in 2 is shown stacked to a cross section 16 glued.

In 3 is a second composite beam 30 for high mechanical loads based on glued laminated wood construction 14 shown. According to the invention there is the plywood training 14 from a lamella of natural wood and from a reinforcing lamella intended as a cover lamella 12 .
wherein the lamella of natural wood has a thickness d such that it is a square timber 18 represents, and
wherein in the zone of high mechanical stress, the reinforcing blade 12 is formed as a synthetic resin press lamella and as a layer of plywood education 14 with the squared timber 18 natural wood is connected, the synthetic resin press lamella 12 consists of compacted, resin impregnated veneers.

In 4 is a third composite beam 40 for high mechanical loads based on glued laminated wood construction 14 shown. According to the invention there is the plywood training 14 from the slats 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 natural wood and a reinforcing lamella intended as a cover lamella 11 .
being a lamella 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 natural wood has a thickness such that it represents a board lamella, and
being in the zone 15 high mechanical stress the reinforcing lamella 11 at least partially with a synthetic resin press lamella 19 is provided and as a layer of plywood education 14 with the slat 9 natural wood is connected, the synthetic resin press lamella 19 consists of compacted, resin impregnated veneers.

In the 4 shown reinforcement lamella 11 consists only in part of synthetic resin 19 , the part made of synthetic resin 19 depending on requirements only in the mechanically highly stressed zone 15 , z. B. in the range of the maximum bending moment exists. The less stressed marginal zones of the reinforcing lamella 11 can be made of lamella parts 20 . 21 consist of natural wood, with the lamella parts 20 . 21 by means of a connection in the form of a finger jointing 22 . 23 or a bearing with the synthetic resin press lamella 19 are glued.

The process for the production of composite beams 1 . 30 . 40 for high mechanical loads based on glued laminated wood construction 14 is that slats 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 natural wood and at least one reinforcing lamella 11 with a synthetic resin press lamella contained therein 19 or at least one reinforcing blade 12 . 13 as a synthetic resin press lamella laminated on each other and then the final stratification for plywood training 14 glued, with the reinforcing lamella 11 . 12 . 13 at least in the mechanically highly stressed zones 15 - tensile zone, pressure zone or compression and tension zone - as cover slat 11 . 12 . 13 is applied, wherein prior to the final stratification, the veneers of the attached synthetic resin press lamella 12 . 13 . 19 impregnated with synthetic resin and compacted.

During the period of gluing the plywood training 14 with the synthetic resin press lamellae 12 . 13 . 19 can be a given compression pressure on the plywood training 14 be exercised.

The compacted, resin-impregnated veneers are compacted by up to 60% during gluing / pressing by means of a predetermined compression pressure.

The compression pressure on the composite beams 1 . 30 . 40 can be applied by mechanical or hydraulic presses or by screw pressing.

• – Eine effektive Verstärkung von Brettholzträgern 1, 30, 40 in Bezug auf Festigkeit und Steifigkeit bei gleichzeitigem Schutz des Bauteils vor Umwelteinflüssen.
• – Aufgrund des massiven Querschnitts der Kunstharzpressholzlamellen 12, 13 können diese erste Risse oder Unstetigkeiten in der angrenzenden Brettlamelle 2, 3, 4, 5, 6, 7, 8, 9, 10, 18 relativ gut aufnehmen, ohne dass es sofort zum Versagen des gesamten Verbundträgers 1, 30, 40 kommt.
• – Eine große Querschnittsfläche bei hoher Biegefestigkeit verhindert vorzeitige Delaminierung der Verstärkungslamellen 11, 12, 13. Dadurch werden die Festigkeiten der Verstärkung besser ausgenutzt. Das verdeutlicht das nichtlineare Last-Verformungsverhalten der Verbundträger 1, 30, 40 mit plastischen Verformungen in der Träger-Belastungszone 15.
• – Eine Erhöhung von Festigkeit und Steifigkeit ermöglicht den Einsatz schlanker Bauteile (geringer Höhe).
• – Eine Kombination von Verstärkungs- und Schutzfunktion – die Erhöhung von Tragfähigkeit und Dauerhaftigkeit kombiniert oder getrennt in Funktion ist möglich.
• – Eine Anwendung im Augenbereich durch die ober- und unterseitige Versiegelung der Hauptangriffsflächen ist ohne besondere Schutzmaßnahmen möglich, wobei ein Schutz des Verbundträgers 1, 30, 40 vor Oberflächenwasser und an den Auflagern vor aufsteigender Feuchtigkeit erreicht wird.
• – Es wird eine erhöhte Querdruckfestigkeit des am Auflager und an Lasteinleitungen erreicht.
• – Die Kunstharzpressholzlamellen 12, 13, 19 besitzen hohe Festigkeiten, da natürliche Holzfehler, wie z. B. Äste, durch die schichtweise Anordnung der Furniere über den Querschnitt verteilt sind.
• – Für die Verleimung der verschiedenen Lamellen 2 bis 13 oder 12 und 18 im Holzleimbaubetrieb in einem Arbeitsgang, ist keine Umstellung des konventionellen Brettschichtholz-Herstellungsprozesses erforderlich. Die Verklebung kann mittels zugelassener Leime durchgeführt werden.
• – Ein nachträgliches Aufbringen der Kunstharzpressholzlamellen 12, 13, 19 ist möglich. Dies ermöglicht die nachträgliche Verstärkung bereits vorhandener Biegeträger aus Vollholz, Kantholz 18 oder aber Brettschichtholz – Ertüchtigung und Sanierung alter Holzkonstruktion.
• - Das verdichtete Material ist schwer entflammbar, was eine hohe Feuerbeständigkeit bedeutet, wodurch zumindest eine zusätzliche Decklamelle zur finalen Schichtholzausbildung 14 entfällt.

The composite carrier according to the invention 1 . 30 . 40 have through the use of formed from veneer synthetic resin press lamellae 12 . 13 . 19 the following advantages:

• - An effective reinforcement of wooden beams 1 . 30 . 40 in terms of strength and rigidity while protecting the component from environmental influences.
• - Due to the massive cross section of the synthetic resin press lamellae 12 . 13 These can be the first cracks or discontinuities in the adjacent board slat 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 18 absorb relatively well, without it immediately leading to failure of the entire composite support 1 . 30 . 40 comes.
• - A large cross-sectional area with high flexural strength prevents premature delamination of the reinforcing fins 11 . 12 . 13 , As a result, the strengths of the reinforcement are better utilized. This illustrates the nonlinear load-deformation behavior of the composite beams 1 . 30 . 40 with plastic deformations in the carrier loading zone 15 ,
• - An increase in strength and rigidity allows the use of slim components (low height).
• - A combination of reinforcement and protection function - the increase in load capacity and durability combined or separated in function is possible.
• - An application in the eye area by the top and bottom sealing of the main attack surfaces is possible without special protective measures, with a protection of the composite support 1 . 30 . 40 is reached before surface water and at the supports before rising damp.
• - It is achieved an increased transverse compressive strength of the support and on load discharges.
• - The resin presswood slats 12 . 13 . 19 have high strength, because natural wood defects, such. B. branches are distributed through the layered arrangement of the veneers over the cross section.
• - For gluing the different slats 2 to 13 or 12 and 18 in wood glueing operation in a single operation, no conversion of the conventional glulam wood manufacturing process is required. The bonding can be carried out using approved glues.
• - Subsequent application of the synthetic resin press lamellae 12 . 13 . 19 is possible. This allows the subsequent reinforcement of existing bending beams made of solid wood, squared timber 18 or glulam - upgrading and refurbishment of old wooden structures.
• - The compacted material is flame retardant, which means high fire resistance, creating at least one additional cover plate for final plywood training 14 eliminated.

LIST OF REFERENCE NUMBERS

1

composite beam

2

First board lamella

3

Second board lamella

4

Third board lamella

5

Fourth board lamella

6

Fifth board lamella

7

Sixth board lamella

8th

Seventh board lamella

9

Eighth board lamella

10

Ninth board lamella

11

First reinforcement lamella

12

Second reinforcement lamella

13

Third reinforcement lamella

14

Plywood training

15

loading zone

16

cross-section

17

mid-axis

18

timber

19

Laminated densified wood slat

20

First lamella part

21

Second fin part

22

First connection

23

Second connection

30

Second composite carrier

40

Third composite beam

l

beam length

d

Thickness of a lamella

d _FvV

Veneer plywood thickness before grouting

d _FnV

Veneer plywood thickness after grouting

Claims (13)

Composite carrier ( 1 . 30 . 40 ) for high mechanical loads on the basis of glued laminated wood ( 14 ) consisting of at least one lamella ( 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 18 ) of natural wood and of at least one reinforcing lamella ( 11 . 12 . 13 ), the lamella ( 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 18 ) natural wood has a thickness d such that it is optionally a square timber ( 18 ) or a board lamella ( 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 ), characterized in that at least in one zone ( 15 ) high mechanical stress the reinforcing blade ( 12 . 13 ) in its entirety as a synthetic resin press lamella or the reinforcing lamella ( 11 ) is at least partially provided with at least one synthetic resin press lamella and as a layer of plywood training ( 14 ) with a lamella ( 2 . 9 . 10 . 18 ) of natural wood, the synthetic resin press lamella ( 12 . 13 . 19 ) consists of compacted, resin impregnated veneers, the resin impregnated, compacted veneers depending on the application different degrees of impregnation - by penetrated or injected liquid and then cured resin - and depending on the application different degrees of compression V with V = 0.4 to 0.9, wherein the _degree of compaction V is defined as the ratio between veneer plywood _thickness d _FnV after compression and veneer plywood _thickness d _FvV before compression and the applied and predetermined compression pressure p _{V is} in a range from 3 MPa to 10 MPa. Composite carrier according to claim 1, characterized in that the adjacent and layered stacked stacked board blades ( 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 ) on / in their glued plywood training ( 14 ) at least one synthetic resin press lamella ( 12 . 13 ) have as reinforcing plate. Composite carrier according to claim 2, characterized in that on both sides to the center axis ( 17 ) spaced at / in the board lamella plywood formation ( 14 ) at least one on / incorporated synthetic resin press lamella ( 12 . 13 ) is present as a cover plate. Composite carrier according to claim 1, characterized in that the reinforcing lamella ( 11 ) as required over the entire composite beam component length l or / but only a part of synthetic resin ( 19 ), z. B. in a mechanically highly stressed zone ( 15 ) In the area of the maximum bending moment, the less stressed zone (s) of the reinforcing lamella ( 11 ) from at least one fin part ( 20 . 21 ) consist of natural wood, which is produced by finger jointing ( 22 . 23 ) or stiffening with the synthetic resin press lamella ( 19 ) are glued. Composite carrier according to claim 1, characterized in that the uncompacted veneers have a thickness d _FvV in a range of 1 mm to 5 mm. Composite carrier according to claim 1, characterized in that the fiber orientation of the compacted veneers ( 12 . 13 . 19 ) is parallel to the fiber orientation and thus parallel to the direction of the main stress. Composite carrier according to claim 1, characterized in that, as required, for stiffening the plywood formation ( 14 ) be oriented one to two veneer layers perpendicular to the fiber orientation of the lamellae of natural wood or the board lamellae. Composite beam according to claim 1, characterized in that the number k (with k = 1, 2 ... n) and the thickness d of the plywood ( 14 ) inserted lamellae ( 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 18 ) natural wood in the form of board lamella are arbitrary, the thickness d of a board lamella ( 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 18 ) is between 2 cm and 5 cm, with a board lamella of greater thickness d than solid wood or square timber ( 18 ) and is possible. Composite carrier according to claim 1, characterized in that a symmetrical cross section ( 16 ) of plywood training ( 14 ) with cross- _{section both sides} and with the same thickness d _FnV provided synthetic resin _{presswood lamellae} ( 12 . 13 ) is present, which are designed as cover slats. Composite carrier according to claim 1, characterized in that the veneers of the synthetic resin press lamellae ( 12 . 13 . 19 ) of coniferous and hardwood, preferably beech wood. Composite carrier according to claim 1, characterized in that the lamellae ( 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 18 ) natural wood and reinforcing fins ( 11 . 12 . 13 ) stacked to a cross-section ( 16 ) are glued, with an adhesive to natural wood and resin adhesively compatible glue is used. Process for producing composite supports ( 1 . 30 . 40 ) according to the preceding claims 1 to 11 for high mechanical loads on the basis of glued laminated wood formation ( 14 ), during the period of the gluing of the plywood formation ( 14 ) a predetermined compression pressure on the plywood training ( 14 ), characterized in that before plywood training ( 14 ) Synthetic resin press lamellae ( 12 . 13 . 19 ) are made of resin-impregnated and compacted veneers, the lamellae ( 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 18 ) natural wood and at least one reinforcing lamella ( 11 ) with a synthetic resin press lamella ( 19 ) or at least one reinforcing blade ( 12 . 13 layered as a synthetic resin press lamella and then the final layering for plywood formation ( 14 ) are glued, wherein the reinforcing blade ( 11 . 12 . 13 ) at least in the mechanically highly stressed zones ( 15 ) as a cover plate in the plywood training ( 14 ), wherein before the final layering, the veneers of the applied synthetic resin press lamella ( 12 . 13 . 19 ) are impregnated and compacted with synthetic resin, and wherein the compacted, resin-impregnated veneers are compacted by up to 60% during gluing / pressing by a predetermined compression pressure in the synthetic resin press lamella formation. A method according to claim 12, characterized in that the compression pressure on the composite support ( 1 . 30 . 40 ) is applied by mechanical or hydraulic presses or by screw pressing.

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