Method for joining load-bearing wooden structural panels

Abstract

The invention relates to a method for producing a composite wooden structural panel for a building structure, comprising: providing a first wooden structural panel (1), which is load-bearing in two axes, with a first side face (11); coating the first side face (11) of the first wooden structural panel (1) with a stable adhesive (3); arranging a second wooden structural panel (2), which is load-bearing in two axes and has a first side face (21), such that the first side face (21) of the second wooden structural panel collides with the adhesive-coated first side face (11) of the second wooden structural panel, as a result of which an adhesive layer (3) which covers both side faces (11, 21) is formed; and hardening the adhesive layer (3) without compression pressure. At least one of the two side faces (11, 21) has a spacing element (4) which is arranged along at least part of the periphery of the first side face (11, 21) and delimits a flat hollow space. The joined wooden structural panel can be produced at a first location and assembled, preferably glued, to form an end product at a second location. The method is in particular suitable for producing load-bearing building ceilings.

Description

Method for joining load-bearing timber construction panels Technical area

[0001] The invention relates to a manufacturing method for composite timber construction panels which are suitable for use in timber construction, for example in load-bearing floor slabs. State of the art

[0002] In contrast to concrete floors or concrete ceilings, which are cast on site from liquid concrete, the use of wooden ceilings in timber construction still presents logistical problems.

[0003] It is known that wooden components, especially wooden panels, can be glued to load-bearing floor slabs and do not require any additional fixings made of metal or concrete.

[0004] WO2014173633 describes a manufacturing process for bonded, large-area timber components that can be used as load-bearing components in timber construction. However, timber ceilings, or parts of these ceilings, are primarily bonded on-site at the construction site, as complete floor slabs cannot be delivered prefabricated to the construction site due to their large dimensions. At the construction site, the delivered panels are manually sealed together via a joint, i.e., a shallow cavity, using an adhesive to form a large-area structure, such as a ceiling.

[0005] The dimensions of available means of transport limit the size of the timber construction panels or assembled timber construction panels that can be prefabricated in industrial production facilities.

[0006] CH20220001228 describes a method for producing an assembled timber construction panel for building structures, in which a first timber construction panel is bonded to a second timber construction panel using a two-component adhesive via a recess in a lateral side of the panel. The timber construction panels can be mechanically bonded with adhesive, allowing an intermediate product for a timber construction ceiling to be produced at an industrial production site. This intermediate product can then be assembled on site to form a larger load-bearing structure, such as a ceiling. The method contributes significantly to reducing the time and labor required to complete a large-scale timber construction panel on site.

[0007] However, sealing timber construction boards with adhesive, both mechanically and manually, has certain disadvantages. Firstly, the adhesive poured into the sealing joint should have a low viscosity, i.e., be as fluid as possible, to reduce the risk of air bubbles being trapped in the adhesive layer. Trapped air bubbles reduce the quality of the adhesive bond and thus the load-bearing capacity of the assembled timber construction board.

[0008] Secondly, the risk of a liquid adhesive with low viscosity leaking from the joint is significantly increased. Leaking can, in turn, lead to air entrapment in the joint and / or incomplete filling of the joint, weakening the adhesive bond. Errors in joint filling can occur in both automated and manual manufacturing processes. The resulting reduction in quality in a load-bearing timber construction product can have devastating consequences.

[0009] Particularly precise work and checks to ensure that no air bubbles are trapped, that the bonding joint is completely filled with adhesive and that the filled adhesive does not leak out are therefore crucial. Description of the invention

[0010] It is an object of this invention to provide a method for finishing composite wood panels which overcomes the disadvantages of known methods.

[0011] It is an object of this invention to provide a method by which composite wood construction panels can be manufactured with reproducibly good quality. In particular, the quality of the joint should be reproducible, so that variations in quality between individual composite wood construction panels are reduced or avoided.

[0012] It is a further object of this invention to provide a method for finishing assembled wood construction panels which can be carried out at least partially by machine.

[0013] It is also an object of this invention to provide an alternative production process for composite wood construction panels.

[0014] According to the invention, one or more of these objects are achieved by a method according to the independent first claim. Further advantageous embodiments of the method are set out in the subclaims.

[0015] Specifically, one or more of these objectives are achieved by a process for producing a composite wood construction panel This is achieved by coating a first side surface of a first, biaxially load-bearing timber construction board with a stable adhesive, preferably a two-component adhesive. For this purpose, the adhesive is preferably distributed substantially over the entire side surface. Distributed substantially over the entire side surface means that the side surface is either completely coated with adhesive, or that only a narrow edge region, which is narrower than three or twice the layer thickness of the adhesive coating, or narrower than the average layer thickness of the adhesive coating, is left exposed.If a spacer element is provided in this area between the first and the second wood construction board in the edge area, the edge area left free may be the area contacting the spacer element plus not more than three times or twice the layer thickness, or not more than the average layer thickness of the adhesive coating.

[0016] Preferably, the distributed adhesive forms a layer of homogeneous thickness.

[0017] The stable adhesive can be a two-component or multi-component adhesive, for example a two-component or multi-component adhesive based on polyurethane (PUR) or epoxy resin.

[0018] The first side surface of the first wooden construction board can be coated mechanically with a stable adhesive, for example using a slotted nozzle.

[0019] The first side surface of the first wooden construction board can also be manually coated with a stable adhesive.

[0020] A second biaxially supporting timber construction board with a first side surface is arranged in a next step such that the first side surface of this timber construction board is connected to the adhesive-coated first side surface of the first wooden construction board, thereby forming an adhesive layer covering the first side surfaces of the two wooden construction boards. Preferably, the two first side surfaces are completely covered with adhesive.

[0021] By joining the first side surface of the second timber construction board to the first side of the first timber construction board, which is already coated with a stable adhesive, the formation of air pockets or air bubbles is avoided. Furthermore, the use of a stable adhesive reduces or completely prevents the adhesive from leaking from the joint. The use of a stable adhesive is not possible for pouring the boards over a joint, as this would lead to significant air pockets.

[0022] The method of this invention therefore offers the advantage of reducing the risk of insufficient formation of a gap-filling adhesive layer between the bonded wood panels. A particularly advantageous feature is that this method can significantly reduce or completely eliminate air inclusions or pockets in the adhesive layer, thereby improving the quality of the joint. Since the risk of air inclusions is reduced, variation in the quality of the joint between different assembled wood panels is prevented, so that this method not only delivers improved joints but also assembled wood panels of reproducible quality.

[0023] This process allows the wood panels to be bonded under constant and controlled conditions. It is therefore particularly suitable for automation. Compared to the conventional grouting process, the process of this invention is less complex, especially with regard to adhesive application. Furthermore, the bonding of the wood panels is faster, since grouting joints is relatively time-consuming.

[0024] In one embodiment, the first side of the second timber construction panel has one or more spacer elements. A spacer element serves to determine a minimum distance between the panels. The spacer elements are preferably made of the same material as the second timber construction panel. Preferably, the at least one spacer element is formed integrally with the second timber construction panel on the first side surface. Spacer elements that are integral components of the timber construction panel offer the advantage that no additional work step is required to attach the spacer elements. Furthermore, gaps caused, for example, by inaccurate attachment of spacer elements can be avoided.

[0025] At least one of the spacer elements is arranged along at least part of the periphery of the first side surface of the second wood construction panel and defines a joint. A joint is a shallow cavity formed between the first side surfaces of the two mutually arranged wood construction panels and which can be or is filled with adhesive.

[0026] One or more spacer elements may be arranged along the periphery of the first side surface so as to define a flat cavity on at least three sides.

[0027] One or more spacer elements can be distributed over the surface of the first side surface of the second timber construction panel.

[0028] One or more spacers can be arranged to define one or more open or closed joint pockets. A closed joint pocket is a joint that is completely defined by one or more spacers. An open joint pocket is a joint pocket that is open to the outside in at least one section. An open joint pocket can, for example, be open at the top if the wood panels are lying on the floor for bonding.

[0029] The two wood construction panels are preferably arranged in such a way that the minimum distance between the panels is 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, or 4 mm. However, the minimum distance can also be significantly larger, for example, 20 mm. The gap forming the joint between the two panels is filled by the adhesive coating of the first wood construction panel.

[0030] The wood construction panels are arranged relative to one another in order to distribute the adhesive layer over the entire joint or across the entire gap. To ensure an even distribution of the adhesive over both side surfaces to be bonded, the panels are pushed together until the adhesive completely covers the surfaces to be bonded. In particular, the adhesive should also be distributed over the edge area of ​​the first wood panel or up to the spacer element that borders the joint. In this arrangement, the non-slumping adhesive completely covers the first side surface of the first wood construction panel. The first surface of the first wood construction panel is completely coated with adhesive, at least in the sections that do not form spacers or are covered by them.

[0031] The structure of the side surfaces is naturally somewhat rough unless pretreated. To completely cover all unevenness in the side surfaces, light pressure can be applied while aligning the two boards. However, it is important that no pressure is applied while the adhesive is curing, which could reduce the distance between the wood construction boards. The position of the arranged boards therefore remains unchanged while the adhesive is curing. In other words, the adhesive cures without applying any pressure.

[0032] To compensate for natural unevenness of the side surfaces of the timber construction boards and thus further improve the quality of the joint, the first side surface of the first timber construction board can be pre-treated. The coating is pretreated with an adhesive. The side surface can be filled, for example. Alternatively or additionally, the first side surface can be pretreated with a coating. An adhesive, preferably a thick adhesive with a viscosity of 20,000 mPa*s to 100,000 mPa*s, is used for the coating. The pretreatment coating fills small cracks, gaps, or depressions in the side surface to create a smoother surface.

[0033] The first side surface of the second wooden construction board can also be pretreated accordingly.

[0034] The coating of the first wood panel with adhesive and / or the positioning of the second wood panel to the first wood panel can be automated. Automating these steps increases the efficiency of this method and therefore enables faster delivery of the assembled wood panels for completion into a large-scale structure on site.

[0035] The first and second wood construction panels can be glued together at a first location to form a composite panel. The composite panel can be an intermediate product that can then be assembled at a second location to form a larger building structure, such as a floor slab. The first location can be an industrial production facility. The second location is preferably the location where the larger building structure will be used, such as a construction site.

[0036] Preferably, the intermediate product is dimensioned such that it can be transported from the first location to the second location by conventional trucks.

[0037] Two or more intermediate products can then be combined at the site of use. Preferably two or more intermediate products are bonded together without applying pressure.

[0038] Preferably, the end product of this process is a structurally load-bearing component for building structures, for example a structurally load-bearing floor slab.

[0039] Statically load-bearing timber components can be used as structural elements in buildings.

[0040] The term "wooden construction panel" as used here means a structural element made of a wood-based material with two parallel usable surfaces, which, depending on their orientation, form a top and a bottom, and side surfaces, each of which has smaller dimensions than one usable surface. The two usable surfaces preferably have the same dimensions.

[0041] In a preferred embodiment, the timber construction panels take the shape of a flat parallelepiped. The usable surfaces can take the shape of a right-angled quadrilateral, for example, a square. The timber construction panels are preferably cuboids. In a preferred embodiment, the timber panels have two usable surfaces and four lateral sides.

[0042] However, the panels can also have triangular or other polygonal surfaces. The number of lateral surfaces varies accordingly, depending on the shape of the base.

[0043] The term "wood-based material" used here refers to a material made from joined, comminuted wood, for example, by gluing. Wood-based materials include, for example, cross-laminated timber, cross-laminated timber, veneered timber, or glued laminated timber. Cross-laminated timber and cross-laminated timber are also known as Cross-laminated timber is known as "C LT." Wood-based materials in which the shredded wood structural elements are arranged crosswise to a similar extent are biaxially load-bearing.

[0044] However, uniaxially load-bearing veneer plywood, such as LVL (laminated veneer lumber), is not suitable as a wood panel for the process of this invention. Although this wood component also has barrier layers, these serve exclusively to provide dimensional stability and not to transmit forces along a second axis. For this reason, LVL veneer plywood panels are unsuitable for the process of this invention.

[0045] A biaxial load-bearing timber construction panel is a component made of wood-based material that bears loads across its entire surface.

[0046] A "sag-resistant adhesive" is an adhesive with a viscosity of at least 20,000 mPa*s, or at least 25,000 mPa*s. Non-sag adhesives are typically non-Newtonian fluids with a shear rate that changes viscosity. The required sag resistance of an adhesive layer depends on its thickness. Thicker layers require greater sag resistance.

[0047] A "thick adhesive" is an adhesive with a viscosity of 15,000 mPa*s to 80,000 mPa*s, or 20,000 mPa*s to 50,000 mPa*s.

[0048] It is possible that an adhesive of a certain viscosity can be used both as a stable and as a thick adhesive. Short description of the characters

[0049] The invention is explained in more detail with reference to the attached figures, in which Fig. 1A is a perspective view of the first side surfaces of an embodiment of the first adhesive-coated wood construction board and, shown above, side surfaces of a first embodiment of the second wood construction board; Fig. 1B is a plan view of the two adjacent timber construction panels shown in Figure 1A; Fig. 1C is a sectional view AA of the adjacent timber construction panels of Figure 1B before they are joined together in an assembly step; Fig. 1D shows the sectional view AA of Figure 1C after the two wooden construction panels have been joined together and arranged to each other for gluing; Fig. 2A is a perspective view of the first side surfaces of one embodiment of the first adhesive-coated wood construction board and, shown above, side surfaces of a second embodiment of the second wood construction board; Fig. 2B is a plan view of the two adjacent timber construction panels shown in Figure 2A; Fig. 2C is a sectional view AA of the adjacent timber construction panels of Figure 2B before they are brought together in an assembly step; Fig. 2D shows the sectional view AA of Figure 2C after the two wooden construction panels have been joined together and arranged to each other for gluing; Fig. 3A is a perspective view of the first Side surfaces of one embodiment of the first adhesive-coated wood construction panel and, shown above, side surfaces of a third embodiment of the second wood construction panel; Fig. 3B is a plan view of the two adjacent timber construction panels shown in Figure 3A; Fig. 3C is a sectional view AA of the adjacent timber construction panels of Figure 3B before they are brought together in an assembly step; Fig. 3D shows the sectional view AA of Figure 3C after the two wooden construction panels have been joined together and arranged to each other for gluing; Fig. 4A is a perspective view of the first Side surfaces of one embodiment of the first adhesive-coated wood construction panel and, shown above, side surfaces of a fourth embodiment of the second wood construction panel; Fig. 4B is a plan view of the two adjacent timber construction panels shown in Figure 4A; Fig. 4C is a sectional view AA of the adjacent timber construction panels of Figure 4B before they are brought together in an assembly step; Fig. 4D shows the sectional view AA of Figure 4C after the two wooden construction panels have been joined together and arranged to each other for gluing; Fig. 5A is a perspective view of the first Side surfaces of one embodiment of the first adhesive-coated wood construction panel and, shown above, side surfaces of a fifth embodiment of the second wood construction panel; Fig. 5B is a plan view of the two adjacent timber construction panels shown in Figure 5A; Fig. 5C is a sectional view AA of the adjacent timber construction panels of Figure 5B before they are brought together in an assembly step; Fig. 5D shows the sectional view AA of Figure 5C after the two wooden construction panels have been joined together and arranged to each other for gluing; Fig. 6A is a perspective view of the first side surfaces of an embodiment of the first adhesive-coated wood construction board and, shown above, side surfaces of a sixth embodiment of the second wood construction board; Fig. 6B is a plan view of the two adjacent timber construction panels shown in Fig. 6A; Fig. 6C is a sectional view AA of the adjacent timber construction panels of Figure 6B before they are brought together in an assembly step; Fig. 6D shows the sectional view AA of Figure 6C after the two wooden construction panels have been joined together and arranged to each other for gluing; Ways to implement the invention

[0050] The inventive embodiment of the invention is illustrated by the figures.

[0051] The timber construction panels shown in the figures are biaxial load-bearing panels made of wood-based material. The panels shown are cross-laminated timber panels made of multiple wood layers, in which the side surfaces of the first wood layers, which intersect the main grain direction of a first wood layer, alternate with the side surfaces of adjacent wood layers, which run parallel to the main grain direction of the adjacent wood layer.

[0052] Depending on your needs, the timber construction panels can have different dimensions suitable for your use in construction.

[0053] In one version, the timber construction panels have an area of ​​1 m 2 up to 5m 2 , preferably 2m 2 up to 3m 2 , for example 2.5m 2 However, wood panels with much larger dimensions can also be bonded using this method. For example, wood construction panels can also cover an area of ​​10 m 2 , 15 m 2 , or 20 m 2 have.

[0054] The thickness of a wooden construction board can be, for example, from 5 cm to 50 cm, preferably from 10 cm to 30 cm, for example 20 cm.

[0055] The figures schematically show different embodiments of first and second wood construction panels, or combinations thereof, which can be bonded together to form a composite wood construction panel according to the method of this invention. In all figures, the first wood construction panel 1 is shown below the second wood construction panel 2.

[0056] Figures 1A to 1D show a first, simple embodiment in which both the first side surface 11 of the first wooden construction board 1 and the first side surface 21 of the second wooden construction board 2 are flat. The first side surface 11 of the first wooden construction board is coated with a stable adhesive 3. This is illustrated in the perspective view of Figure 1A.

[0057] Figure 1B is a plan view of the first wooden construction panel 1 and the second wooden construction panel 2 of the first embodiment, which are arranged longitudinally relative to each other, so that the respective first side surfaces 11, 21 of the two wooden construction panels 1, 2 face each other. AA indicates the section line corresponding to the cross-sectional view in Figure 1C.

[0058] In Figures 1C and 1D, as well as in the corresponding Figures 2C, 2D, 3C, 3D, 4C, 4D, 5C, 5D, 6C, and 6D, the side surfaces of the first wood layers that intersect the main grain direction of a first wood layer are shown with diagonal stripes, while the side surfaces of the adjacent wood layers that run parallel to the main grain direction of the respective wood layer are shown in white.

[0059] Figure 1C shows a section of a cross-sectional view AA, in which the first side surface of the first wooden construction board 1, coated with adhesive 3, is opposite the first side surface of the second wooden construction board 2. The two boards are now pushed toward each other until they collide, which is indicated by the two arrows.

[0060] Figure 1D shows the joined timber construction panels with a bonding layer of adhesive. The adhesive layer completely fills the joint between the two timber construction panels 1 and 2. In this position, the stable adhesive cures into an adhesive layer.

[0061] During the curing of the adhesive according to this invention, the two wooden construction panels 1, 2 are not pressed against each other or shifted further towards each other. The position of the two wooden construction panels 1, 2, In particular, the distance between the two wood construction panels remains unchanged during the adhesive curing step. The adhesive cures without applying any pressure.

[0062] Figure 1 D shows the connecting adhesive layer 3 between the two wooden construction panels 1, 2, which now form a composite wooden component.

[0063] Figures 2A to 2D show a second exemplary embodiment of wood construction panels that can be glued together to form an assembled wood component according to this invention. The first side surface of the second wood construction panel has a spacer element 4 that is one piece with the panel and delimits the lower edge and the two lateral edges of the first side surface. The spacer element 4 delimits a flat, upwardly open cavity. By joining it to the adhesive-coated first side of the first wood construction panel, the flat cavity is filled with adhesive, so that an upwardly open joint filled with adhesive 3 is formed in the assembled wood component. This is shown in Figures 2C and 2D. Figures 2A and 2B show the corresponding arrangements of this second exemplary embodiment described in Figures 1A and 1B.

[0064] A third embodiment of wood construction panels that can be glued according to this invention is shown in Figures 3A to 3D.

[0065] In this exemplary embodiment, as shown in Figure 3A, the first side of the second wooden construction panel 2 is completely surrounded by a spacer element 4. The spacer element 4 is formed integrally with the second wooden construction panel. The first side of the first wooden construction panel 1 is coated with adhesive 3, whereby the adhesive is applied over such a large area that it can completely fill the shallow cavity enclosed by the spacer element 4, as shown in Figure 3B.

[0066] When the two wooden construction panels 1, 2 are now joined together, a closed joint filled with adhesive 3 is formed, as can be seen in Figures 3C and 3D.

[0067] It is also possible to obtain composite wood components with multiple open or closed joint pockets using the method of this invention. Figures 4A to 4D, for example, show a fourth possible embodiment of wood construction panels that can be bonded according to this invention.

[0068] In this embodiment, the first side surface of the second wooden construction panel 2 has a spacer element 4 that forms two closed, flat cavities arranged next to one another. The two regions of the first side surface of the first wooden construction panel 1 are coated with adhesive 3A, 3B over their entire surface, corresponding to the dimensions of the two cavities. However, it is also possible to provide a uniform adhesive coating. Joining the panels together during assembly causes the adhesive to ooze out between the spacer 4 and its contact points on the first side surface of the first wooden construction panel. At most, a thinner, remaining layer of adhesive can additionally bond the spacer to its contact surface.

[0069] As shown in Figures 4A, 4C, and 4D, the two wood construction panels 1, 2 are arranged and bonded together according to the method of this invention. The resulting assembled wood component has two completely closed joint pockets, each filled with an adhesive layer 3.

[0070] A further, fifth embodiment of a first and second wooden construction panel 1, 2, which can be glued according to this invention, is shown in Figures 5A to 5D.

[0071] As shown in Figure 5A, the second wood construction panel 2 has a plurality of elongated, flat cavities on its first side surface, which span the length of the side surface up to the spacer elements 4 and are arranged side by side. The spacer element 4 defines these elongated cavities. The cavities are closed cavities for forming closed, elongated joints, which result from the arrangement and bonding steps shown in Figures 5B to 5D.

[0072] The first side surface of the first wooden construction board 1 can be coated with adhesive according to the dimensions of the flat, elongated cavities, as shown in Figure 5A. However, analogous to the fourth embodiment, it is also possible here to distribute the adhesive substantially over the entire first side surface of the first wooden construction board.

[0073] Figures 6A to 6D show a sixth possible embodiment of wood construction panels 1, 2 that can be glued according to this invention. As can be seen in Figure 6A, a cover element 4 arranged at the edge around the first side surface delimits a closed cavity of the second wood construction panel 2. The closed cavity can be subdivided by one or more further spacer elements 46 that do not adjoin the edge spacer element 4. In the illustrated embodiment, four spacer elements 46 arranged parallel to the surface of the second wood construction panel subdivide a closed, flat cavity. In the illustrated embodiment, the adhesive 3 is applied exclusively to the corresponding areas of the first side surface of the first wood construction panel 2.

[0074] By arranging and joining according to the illustrations in Figures 6B to 6D, a closed joint is formed which is divided into several sub-areas by the central spacer elements 46.

[0075] The interruptions in the adhesive joints created by the center gaps primarily serve to accommodate moisture-induced swelling and shrinkage of the wood. This makes the bonded wooden component less susceptible to changes in wood moisture content. The robustness of the bonded wooden component in various environmental conditions is thus further improved.

[0076] Furthermore, adhesive can be saved due to the central spacing, which is also economically interesting, especially for bonding across wider joints.

Claims

Patent claims 1. A method for manufacturing a composite wood panel for a building structure, comprising the steps of (a) providing a first biaxially supporting timber construction panel (1) having a first side surface (11), (b) coating the first side surface (11) of the first wooden construction board (1) with a stable adhesive (3), (c) arranging a second biaxially supporting wooden construction board (2) having a first side surface (21) such that the first side surface of the second wooden construction board abuts the adhesive-coated first side surface (11) of the first wooden construction board (1), thereby forming an adhesive layer covering the two first side surfaces, (d) curing the adhesive layer (3) without pressure, wherein the first side surface (11) of the first wooden construction board (1) and / or the first side surface (21) of the second wooden construction board (2) has at least one spacer element (4) which is arranged along at least part of the periphery of the first side surface (11, 21) and which delimits a flat cavity.

2. Method according to claim 1, wherein the first side surface (11) of the first wooden construction board (1) is coated mechanically with stable adhesive (3), for example by means of a slotted nozzle.

3. Method according to one of claims 1 or 2, wherein the at least one spacer element (4) is formed integrally with the second wooden construction board (2).

4. Method according to one of claims 1 to 3, wherein one or more spacer elements (4, 46) are distributed over the surface of the first side surface (21) of the second wooden construction board (2).

5. Method according to one of claims 1 to 4, wherein one or more spacer elements (4, 46) delimit a plurality of open or closed flat cavities.

6. Method according to one of claims 1 to 5, wherein the adhesive (3) is a stable two-component adhesive or a stable multi-component adhesive.

7. Method according to one of claims 1 to 6, wherein the adhesive (3) has a viscosity of 20,000 mPa*s to 100,000 mPa*s.

8. Method according to one of claims 1 to 7, wherein the two wooden construction boards (1, 2) are arranged relative to one another in such a way that a minimum distance of 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm or 4 mm is maintained between the first side surfaces (11, 21) of the wooden construction boards during the curing of the adhesive (3).

9. Method according to one of claims 1 to 8, wherein prior to step (a) a pretreatment step comprising filling one or both first side surfaces (11, 21) to be bonded is carried out.

10. Method according to one of claims 1 to 9, wherein prior to step (a) a pretreatment step comprising coating the first side surface (11) of the first wood construction board (1) with a base layer, for example a viscous adhesive layer, is carried out.

11. Method according to one of claims 1 to 10, wherein at least the steps of coating the first side surface of the first wooden construction board (1) with adhesive (3) and arranging the second wooden construction board (2) to the first wooden construction board (1) are carried out automatically.

12. Manufacturing method of a timber construction ceiling, comprising - manufacturing a composite timber construction panel according to one of claims 1 to 12 at a first location, - Transport of the assembled wooden construction panel to a second location - Joining two or more assembled timber construction panels together to form a final product at the second location.

13. Manufacturing method according to claim 12, wherein two or more assembled wood construction panels are glued together at the second location without pressure.

14. Manufacturing method according to one of claims 12 or 13, wherein the final product is used as a load-bearing floor slab or as a planar component of a load-bearing floor slab of a building.

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