Building block system and method for building a wall

Abstract

The invention describes a multi-layer building block (1) comprising at least two wooden layers (2), where the building block further comprises a first outer surface (3) and a second outer surface (5) and first to fourth inner surfaces (6, 7, 9, 10), where the first inner surface ( 6) comprises at least one primary locking groove (8a), and second inner surface (7) on the opposite side of the building block (1) comprises at least one primary locking groove (8a) at the same distance(s) from at least one of the outer surfaces (3, 5) as the at least one primary locking groove (8a) of the first the inner surface (6). All wooden layers (2) are glued together or indirectly attached to each other via a functional layer (15) and where each wooden layer includes one or more pieces of wood of approximately the same total thickness over, essentially, the entire area of the wooden layer. Furthermore, the invention includes a building block system which includes a primary locking strip (11a) which can lock the building blocks to each other and a method for building a wall with the building blocks.

Description

The field of invention

[0001] The invention relates to a building block system for the construction of smaller buildings and internal structures in larger buildings, more precisely a building block mainly made of glued wood and an associated locking strip which enables the rapid construction and dismantling of building surfaces such as walls, roofs or floors.Background

[0002] With increased interest in wood as a building material and increased understanding of wood in buildings as a carbon store, a number of innovations have been made. Glued laminated timber, commonly referred to as glulam, and cross-laminated wood are used to build taller houses and larger roof surfaces, and public construction projects to a greater extent look towards wood as a building material. Examples of this are Buchart's high-rise building in Brumundal , Norway and the airport at Gardemoen, Norway. In order to keep carbon stored in wood, that is part of a building, away from the atmosphere, it would be a clear advantage to be able to reuse the wood and gradually recover the wood fibres. This is done to a very small extent with buildings that are demolished today. A little further back in time, it was not uncommon to move a half-timbered house because it was possible to lift the logs off the building one by one.

[0003] A common construction method for a home can be timberwork that is covered with exterior and interior cladding, preferably with insulation and membranes as air and vapor barriers. All the building materials are put together on the construction site. The advantage of this method is high flexibility in the sense that it is rare that a craftsman or expensive cranes are left waiting for others to finish. Adjustments to deviations can also be made easily.

[0004] Another construction method is prefabricated houses that use sections that are completed in a factory and transported to the construction site in relatively few sections. This method is faster, but significantly less flexible with regard to waiting for equipment and completion. Adjustments to deviations are also more complicated because there are large rigid sections that must fit together.

[0005] Document US 2004 / 194406 A1 discloses a building block system according to the preamble of claim 1.

[0006] There is a lot of wasted wood in the wood industry and the construction industry, and the amount of wood waste at Norwegian recycling stations is large. There is a need to find a use for this waste product.

[0007] Furthermore, there is always a need for temporary constructions that can be taken down and used again. Examples of such temporary constructions can be exhibition stands, refugee camps, smaller warehouses, garages, etc.

[0008] The invention seeks to solve at least some of the aforementioned problems.

[0009] One purpose of the invention is to provide a building block and a building block system that can be easily assembled and disassembled for reuse.

[0010] Another object of the invention is to provide a building block which can be constructed from scraps from the wood industry, used wood and manufactured wood.

[0011] Another object of the invention is to provide a building block and a building block system which keeps the carbon in the wood away from the atmosphere over a longer period of time.

[0012] Another object of the invention is to provide a building block and a building block system which can be erected quickly in a flexible manner.

[0013] Yet another object of the invention is to provide a building block and a building block system that quickly can be dismantled for later reuse.Summary of the invention

[0014] The invention is a building block system according to claim 1.

[0015] In an embodiment the building block further comprises at least one hole in a horizontal or vertical direction parallel with the outer surfaces. Preferably the holes are throughgoing. The at least one hole is / are configured to be positioned in line with the at least one throughgoing hole of the adjacent building block and adapted for receiving support pins extending into both adjacent building blocks for providing extra structural stiffness to a wall build by the building blocks.

[0016] In yet an embodiment, the layers of the building block lie parallel to the outer surfaces.

[0017] In yet another embodiment, the building block comprises at least one further wooden layer between a first and second layer comprising respective first and second outer surfaces

[0018] In yet an embodiment, the building block comprises a layer selected from the group comprising: a heat-insulating layer, a sound-insulating layer, a distance layer, a bulletproof layer and a fire-insulating layer.

[0019] In yet an embodiment, the building block comprises at least one supporting layer consisting of compact wood with the annual rings vertically aligned. Compact here means that there are no significant voids in the supporting layer

[0020] In yet an embodiment of the building block, the at least two layers are cross-laminated.

[0021] In an embodiment of the building block, the at least one primary locking groove and the at least one secondary locking groove are rectangular or dovetail shaped.

[0022] In yet another embodiment of the building block system, the at least one primary locking strip and the at least one secondary locking strip are rectangular shaped or dovetail shaped, to fit into the corresponding locking grooves.

[0023] In another aspect, the invention comprises according to claim 7 a method for building a wall with building blocks and a building block system.

[0024] In one embodiment of the method for building a building surface, the secondary locking strip is a dovetail strip, and the secondary locking groove has a corresponding dovetail shape and where, in step b, the secondary locking strips are inserted from above into the aforementioned cavities formed by the respective secondary locking grooves.

[0025] In yet another embodiment of the method for building a building surface, each row of building blocks is laid in a joint pattern.

[0026] In yet another embodiment of the method of building a building surface, vertically adjacent building blocks are aligned with the secondary locking grooves flush with each other.Brief description of the figures

[0027] To facilitate the understanding of the invention, we have attached some figures where the same reference number refers to the same feature in the various figures. Fig. 1a shows a side view of the building block and fig. 1b shows a top view of the building block. Fig. 2a and 2b show an embodiment of the building block in perspective with three and five layers of wood respectively. Fig. 3a and 3b show a wall constructed of building blocks according to the invention according to a joint pattern and with vertical inner surfaces flush with each other, respectively. Fig. 4 shows the construction of a wall using building blocks and locking strips according to the invention. Fig. 5a -d shows different fasteners for attaching building blocks to floors and wall s Fig. 6a and b show two versions of a wooden layer. Fig 7 shows an embodiment of a building block comprising support holes and sealing cords. Fig. 8 shows an embodiment of a building block comprising throughgoing support holes and support pins adapted to enter the support holes. Fig. 9 shows the positioning of support holes in a set of blocks of different sizes. Detailed description

[0028] The invention describes a multilayer building block 1 which is at least partially made of wood. To make explanation easier, we assume that the building blocks form part of a vertical wall, although all possible angles with the horizontal plane are possible. The building block can also be used to build floors and roofs and 'building surface' is sometimes used as a common term for these. Constructions built up from building blocks 1 according to the invention can be dismantled and the building blocks can be used again. All sides of the building block are rectangular in shape and are perpendicular to all adjacent side faces as shown in Fig 1 and Fig 2. This is also called a cuboid. In the text, square is considered to be a special case of rectangular. That is, when the text says rectangular, it also includes square. Brick shape is also a word that can be used for this shape.

[0029] The building block 1 comprises at least two wooden layers 2 where adjacent wooden layers are glued together. Furthermore, the building block 1 comprises a first outer surface 3 and a second outer surface 5 which is essentially parallel to the first outer surface 3 on the opposite side of the building block 1. The outer surfaces 3, 5 are the surfaces that face the room and which are visible when the building block, for example, is mounted in a wall.

[0030] Figure 1a shows a side view of an embodiment of the building block 1 with the line of sight parallel to the longitudinal direction of the building block. The building block is lying on the side resting on an outer surface. Figure 1b shows a top view or a cross-section of the building block 1 with a line of sight parallel to the height direction of the building block. The building block comprises a first inner surface 6 perpendicular to the outer surfaces 3, 5, where the first inner surface 6 comprises at least one primary locking groove 8a. The building block further comprises a second inner surface 7 which is essentially parallel to the first inner surface 6 on the opposite side of the building block 1 and which comprises at least one primary locking groove 8a at the same distance(s) from at least one of the outer surfaces 3, 5 as the at least one the primary locking groove 8a to the first inner surface 6. Preferably, the at least one primary locking groove 8a has the same distance(s) to both outer surfaces.

[0031] The building block further comprises a third inner surface 9 perpendicular to the first and second inner surfaces 6, 7, where the third inner surface preferably comprises at least one secondary locking groove 8b which is preferably parallel to the outer surfaces 3, 5. The inner surfaces 6, 7, 9 and 10 are the surfaces which are not visible from the room adjacent to the wall and which face an adjacent building block or form an outer edge of the wall or building surface.

[0032] In a preferable embodiment one of the outer surfaces is chosen as a reference surface 17 from which the position of the primary and secondary locking grooves 8a, 8b are measured.

[0033] The building block further comprises a fourth inner surface 10 preferably comprising at least one secondary locking groove 8b which is at the same distance(s) from the at least one of the outer surfaces 3, 5 as the at least one secondary locking groove 8 in the third inner surface. Advantageously, if there is only one secondary locking groove 8b it has the same distances to both outer surfaces 3, 5. If there are more than one secondary locking groove 8b, they are preferably symmetrical about a centerline of the third and fourth inner surfaces respectively. The fourth inner surface 10 is essentially parallel to the third inner surface 9 on the opposite side of the building block.

[0034] The primary and secondary locking groove 8a, 8b can advantageously lie at different distances from the at least one outer surface 3, 5 so that the two grooves do not coincide at any time.

[0035] Each of the at least two wooden layers 2 in the building block 1 comprises one or more pieces of wood of approximately equal total layer thickness (LT), layer width (LB) and layer length (LL) over essentially the entire extent of the wood layer 2 in the respective directions (LL, LT, LB).

[0036] Adjacent wooden layers are glued together either directly or attached to each other via, for example, one or more functional layers 15 which are discussed later. A layer 2 of wood can, for example, comprise a plank of thickness N X T in one area and N planks of thickness T in another area. The same applies to the width and length: A wooden layer can consist of a plank of width M X B in one area and M planks of width B in another area, a plank of length P X L in one area and P planks of width L in another area. A wooden layer does not have to be completely covered in the sense that any distance or stay between the pieces of wood that make up a layer is tolerated as long as sufficient structural stiffness and strength is achieved. In addition, the locking grooves must be sufficiently complete for the locking strips to actually lock the building blocks. Figure 2a shows a building block with 3 layers, while Figure 2b shows 5 layers: 2a, 2b, 2c and 2e, and in addition a functional layer 15.

[0037] Advantageously, the layers in the building block is positioned parallel to the outer surfaces 3, 5 as shown in fig. 2 a and b. It is also conceivable that the layers can lie perpendicular to the outer surfaces 3, 5.

[0038] In one embodiment, the building block comprises at least one further wooden layer 2c, d, e, f, etc. between a first layer 2a and a second layer 2b comprising respective first and second outer surfaces 3, 5.

[0039] In one embodiment, the building block, as previously mentioned, comprises one or more functional layers 15 selected from the group comprising: a heat-insulating layer, a sound-insulating layer, a spacer layer, a bulletproof layer and a fire-insulating layer. A heat-insulating layer can e.g. be a layer of stone wool between two layers of wood and where the layers on each side of the insulating layer are held together by brackets. Such a layer adds a specific function to the building block and is therefore called a functional layer 15. Fig 2b shows a function layer in the middle of the block.

[0040] In one embodiment, the building block comprises at least one load-bearing layer consisting of compact wood with the annual rings directed in the load-bearing direction, which in practice often means vertically directed. In this context, compact means that there is no distance between the pieces of wood that make up the layer as shown in fig. 6a. In order for the wooden layer in fig. 6a to be load-bearing, the grain ring should run in the width direction of the wooden layer. The width direction of the wooden layer is then positioned in the load-bearing direction of the building block, which will usually be the height direction

[0041] In one embodiment, the layers of wood in the building block are cross-laminated. This provides the best distribution of stresses in the wood. Cross-laminated means that the longitudinal direction of adjacent layers has an angle with each other. This angle can be 90 degrees, but also other angles.

[0042] In one embodiment, the at least one primary locking groove 8a of the building block is rectangular-shaped or dovetail-shaped and the at least one secondary locking groove 8b of the building block is rectangular-shaped or dovetail-shaped. The dovetail groove has a cross-section like a truncated pointed triangle and is clearly seen in fig. 1b. Locking grooves that lie flush with each other in adjacent blocks must have the same design.

[0043] The dimensions of the building block, locking groove and locking strips (which are described later) can be varied widely. The thickness T of the building blocks indicated in fig. 2, that is to say the distance from the first outer surface 3 to the second outer surface 5 can be between 5 and 30 cm, more preferably between 10 and 15 cm. The height H of the building block can be between 10 and 50 cm, more preferably between 25 and 35 cm. The length L of the building block can be between 20 and 200 cm, more preferably between 30 and 100 cm. Primary and secondary locking grooves 8a and 8b can have a width w1 and w2, as indicated in Fig. 1, from 10 to 50 mm, more preferably between 15 and 30 mm. The angle of a dovetail groove will typically be in the range of 3 to 15 degrees. Reference is made here to the angle between the height of the pointed truncated triangle that defines the cross-section of the dovetail groove, and one of the sides of said triangle

[0044] The building block system comprises a plurality of multi-layered building blocks 1 as described above. In addition, the building block system comprises primary locking strips 11a which fit into the primary locking grooves. The primary locking strips 11a fit into the cavity(s) formed by respective primary locking grooves 8a in the first and second inner surfaces 6, 7 when two building blocks 1 are placed against each other to form a wall structure. The primary locking strips 11a are preferably continuous over several building blocks throughout the primary locking groove 8a. In particular, the primary locking strips 8a should be continuous where adjacent building blocks 1 meet, i.e. at the first and second inner surfaces 3, 4. In some cases, sufficient stability will be achieved by using only primary locking strips. Advantageously, the building block system can also include secondary locking strips 11b which fit into the secondary locking grooves 8b. The cross section of the first and second locking strips is shown in fig 1a and b and the locking strips can be seen in use in fig. 4.

[0045] The secondary locking strips 11b fit into the cavity(s) formed by respective secondary locking grooves 8b in the third and fourth inner surfaces 9, 10 when two building blocks 1 are placed against each other to form a wall construction. The secondary locking strips 11b can advantageously be continuous in the locking groove 8b of a building block. The primary and secondary locking strips can advantageously be made of veneer. Other materials such as solid wood, metal and plastic are also conceivable.

[0046] The primary and secondary locking strips 11a, 11b are configured to at least lock relative movements between two adjacent building blocks in a direction substantially perpendicular to the outer surfaces 3, 5. A locking groove with a rectangular cross-section and a corresponding locking strip with a rectangular cross-section of the same or slightly smaller dimensions are a well-functioning solutions. In one embodiment, the locking grooves are dovetail-shaped and the locking strips have a corresponding dovetail shape with the same or slightly smaller dimensions. The dovetail shape is known from the construction industry and the furniture industry and will not be described in more detail. The difference between the rectangular shape and the dovetail shape of the locking strips is that the dovetail shape, in addition to preventing relative movement of two adjacent building blocks in a direction perpendicular to the outer surfaces 3, 5, also prevents relative movement of two adjacent building blocks perpendicular to the inner surface where a locking strip and a locking groove with dovetail shape is used. Locking grooves and locking strips can have many other cross-sections than rectangular and dovetail-shaped. In a preferred embodiment, shown in fig. 4, the primary grooves 8a and primary locking strips 11a are rectangular, while the secondary locking grooves 8b and secondary locking strips 11b are dove-tail shaped. This provides a functional combination of fast building and stiffness of the constructed wall.

[0047] In an embodiment shown in fig 7 and 8 the building blocks 1 are provided with support holes 18 and support pins 19 fitting tightly into the support holes 18. Preferably the support holes are throughgoing and the support pins have a length shorter than the height of the building block 1. Preferably, if the support holes 18 are throughgoing, the length of the support pins 19 are nearly as long as the height of the building block. The shape of the cross-section of the support holes 18 and the support pins 19 could be round as in fig 7 and 8 or square or any other shape. The support pins 19 add structural stiffness to a wall build by the building blocks. At least one support hole should be provided in each building block and between 2 and 4 support holes is a preferred number. It is an advantage to have the support holes symmetrically distributed around a central vertical plane of the building block and preferably the support holes a configured to align when positioned both in a square pattern (see fig 3b) and in a connected pattern. If we assume that the building blocks have the same size, this can for instance be obtained by having two support holes 18 positioned with a center point at 25 % and 75% of the length of the building block respectively. If we assume that the building blocks have various sizes as indicated in fig. 9 the building blocks should have lengths equal to the length of the shortest block times an integer (Length of block = L X N where N is an integer). If the centerlines of the support holes 18 are positioned a distance equal to L / 2 from the sides of the building blocks and if N is larger than 2 a support hole should be positioned at every distance L from the first support hole. The effect of this is that every support hole will align with another in the adjacent building block. In the embodiment in fig. 9 we have also added the example of L=30 cm in brackets.

[0048] The support holes 18 (if the support holes are throughgoing) and first and secondary grooves can be used for electrical cables inside the walls if the locking strips 11a, b and / or support pins 19 are left out from their respective grooves and holes. By drilling out a section where the grooves and support holes intersect practically any part of the wall can be reached.

[0049] In a preferred embodiment shown in fig. 7 the building block is provided with a sealing cord 20 made of a resilient material. The sealing cord 20 may extend over all the inner surfaces 6, 7, 9 and 10 and may fit into a sealing groove 16 and protrude from the sealing groove 16. Preferably the sealing cord is positioned inside the locking groove 8a, b, but the sealing cord may also be positioned on surfaces not part of a groove. Fig. 7 shows one sealing cord 20 inside the locking groove 8a and one sealing cord outside the locking groove. The purpose of the sealing cord 20 is to prevent air from penetrating a wall build by the inventive building blocks. The sealing cord 20 may be made of wool or for instance rubber.

[0050] The procedure is described in relation to a wall being built, but it is clear that the surface being built can also be a floor or a roof.

[0051] The procedure includes the steps: a. Attaching a first row of building blocks 1 to a substrate with fasteners where the first and second inner surfaces are aligned parallel to the substrate. The fastening means can, for example, be a strip which is attached to both the substrate and the first bottom row of building blocks with nails or screws. b. Positioning secondary locking strips 11b, if present, in the cavities formed by the respective secondary locking grooves 8b in the third and fourth inner surfaces 6, 7. If the secondary locking strips 11b are dovetail-shaped, they must be threaded into the cavity formed by the cavity formed of the secondary locking grooves 8b in the third and fourth inner surface c. To position primary locking strips 11a in at least one of the primary locking grooves 8a. If there is more than one primary locking groove, one primary locking groove in the first and / or second inner surface 6, 7 can be left open to lay power or water cables in the cavity that occurs. d. Laying a new row of building blocks 1 on top of the previous row of building blocks so that the at least one primary locking strip 11a that was placed in the at least one primary locking groove 8a fits into a locking groove 8a in the building block above. e. To repeat steps b-d until the desired height is reached. f. Possibly, if overlying structures and adjacent side structures are present, to attach the wall to these with fasteners.

[0052] Sequential execution of point f depends on how the fasteners are constructed. In some cases, each block must be attached to the wall as the wall is built. In one embodiment of the method, the secondary locking strip is a dovetail strip and the secondary locking groove has a corresponding dovetail shape and, in step b, the secondary locking strips are threaded from above into the aforementioned cavities formed by the respective secondary locking grooves 8b.

[0053] In an embodiment of the method shown in fig. 3a, each row of building blocks is laid in a connecting pattern. Alternatively, as shown in fig. 3b and Fig. 4, building blocks can be aligned with the secondary locking grooves flush with each other, so that a square or rectangular pattern occurs. In this embodiment, it is important that the primary and secondary locking grooves 8a, 8b are not at the same distance from the outer surfaces 3, 5 so that there is a conflict between the two locking strips 11a, 11b.

[0054] Figure 5 shows some fasteners for attaching a construction surface to an adjacent surface, such as a wall or a substrate. Fig. 5a shows a floor sleeper 12, for example, made of plywood and which is attached to a base, with a half primary locking strip 13 attached to the upper side of the sleeper 12. Fig 5b shows a sleeper 12 made of solid wood where two primary locking grooves 8a are milled into the sleeper for receiving a primary locking strip 8a. Fig. 5c shows a sleeper with half a secondary locking strip 14 attached to an adjacent surface such as e.g. a wall. In Fig. 5d, a half secondary locking strip 14 is attached directly to the wall.

[0055] When building a wall, the top layer will present problems if there is no clearance to the ceiling that corresponds to the depth of the locking groove 8a. This can be solved by adapting the block with such a clearance or by inserting the primary locking strip from the side. The last block, if this goes against a wall or side structure, must then be screwed in place.

[0056] Different corner solutions are possible but will not be described in detail in this application. The corner can be laid in a joint pattern and if the building blocks are twice as long as they are wide, it will not be necessary to make any specially adapted corner blocks. Furthermore, corner posts and angled corner blocks are current options.

[0057] The building blocks can be made from recycled wood alone or in combination with newly produced wood. An advantage of a multi-layer building block is that low-quality wood can be used in some of the layers without significantly reducing the quality of the final product. In this way, wood of reduced quality can be kept in buildings to avoid the carbon in this wood escaping into the atmosphere as CO2.

[0058] When disassembling a surface or a wall built up from building blocks according to the invention, fasteners against any walls and ceilings must be removed. This corresponds to point f in the procedure described above. It is then possible to dimantle building blocks and primary and secondary locking strips in reverse order of construction. That is to say, carry out points e to b in the aforementioned procedure a number of times until the bottom row of building blocks remains. Any fasteners to the substrate are then removed when the last row of building blocks is removed, which corresponds to point a in the aforementioned procedure. In this way, a building block and a building block system have been provided where the building blocks 1 and the locking strips 11a, 11b can be dismantled without damage, so that the blocks and strips can be used again.

[0059] A method for producing building blocks includes the steps: glue together a desired number of layers 2 into an element comprising glued wood, cut out building blocks 1 from the element, cut out primary locking grooves 8a and possibly secondary locking grooves 8b in the building blocks 1.

[0060] Another method for producing building blocks includes the steps: glue together a desired number of layers into one building block. cut out primary and possibly secondary locking grooves in the building block.

[0061] This method is suitable for building blocks which comprise a further layer 2 which is not suitable for cutting, for example a bulletproof layer.Reference list

[0062] 1 Building block 2 Wooden layer 2a, b, c, d...... first, second, third, etc. layers 3 First surface 4 Piece of wood 5 Second outer surface 6 First locking surface 7 Second locking surface 8a Primary locking groove 8b Secondary locking groove 9 Third locking surface 10 Fourth locking surface 11a Primary locking strip 11 b Secondary locking strip 12 Sleeper 13 Half primary locking strip 14 Half secondary locking strip 15 Functional layer 16 Sealing groove 17 Reference surface 18 Support hole 19 Support pin 20 Sealing cord

Claims

1. A building block system comprising: a plurality of multilayer building blocks (1) each comprising: a first outer surface (3), a second outer surface (5) which is substantially parallel to the first outer surface (3) on the opposite side of the building block (1), a first horizontal inner surface (6) perpendicular to the outer surfaces (3, 5) comprising at least one rectangular primary locking groove (8a), a second inner surface (7) substantially parallel to the first inner surface (6) on the opposite side of the building block (1) and comprising at least one primary locking groove (8a) at the same distance(s) from at least one of the outer surfaces (3, 5 ) as the at least one rectangular primary locking groove (8a) of the first inner surface (6), a third inner surface (9) perpendicular to the first and second inner surface (6, 7) comprising at least one secondary locking groove (8b) parallel to the outer surfaces (3, 5), a fourth inner surface (10) , which is essentially parallel to the third inner surface on the opposite side of the building block, comprising at least one secondary locking groove (8b) which lies at the same distance(s) from at least one of the outer surfaces (3, 5) as the at least one secondary locking groove (8) in the third inner surface, and where the multi-layer building block comprises at least two wooden layers (2), where adjacent wooden layers (2) are glued to each other and where the wooden layers are essentially parallel to an outer surface (3, 5) or an inner surface, and primary rectangular locking strips (11a) which fit into the cavity(s) formed by respective rectangular primary locking grooves (8a) in the first and second inner surfaces (6, 7) when two building blocks (1) are placed against each other, wherein the primary locking strips (11a) at least locks relative movements between two building blocks in a direction essentially perpendicular to the outer surfaces (3, 5), secondary locking strips (11b) which fit into the cavity formed by respective secondary locking grooves (8b) in the third and fourth inner surface (9, 10) when two building blocks (1) are placed against each other and at least lock relative movements between two building blocks in a direction perpendicular to the outer surfaces (3, 5), wherein each wooden layer (2) comprises one or more pieces of wood (4) of approximately the same total layer thickness (LT), layer width (LB) and layer length (LL) over, essentially, the entire length of the wooden layer (2) in the respective directions (LL, LT, LB) and wherein the pieces of wood (4) in each wooden layer are glued together, and characterized in that each building block is provided with at least one sealing cord (20) extending over all the inner surfaces and positioned inside the primary locking grooves (8a, 8b).

2. Building block system according to claim 1, wherein each building block (1) further comprises at least one support hole (18) in a horizontal or vertical direction parallel with the outer surfaces, wherein the at least one support hole (18) is / are configured to be positioned in line with the at least one support hole (18) of the adjacent building block and adapted for receiving support pins (19) extending into both adjacent building blocks for providing extra structural stiffness to a wall build by the building blocks.

3. Building block system according to any one of the preceding claims, wherein each building block comprises a layer (2) selected from the group comprising: a heat-insulating layer, a sound-insulating layer, a distance layer, a bulletproof layer and a fire-insulating layer.

4. Building block system according to any of the preceding claims, wherein each building block comprises at least one load-bearing layer consisting of compact wood with the annual rings directed in the load-bearing direction.

5. Building block system according to any one of the previous claims, wherein the at least one secondary locking groove (8b) are rectangular or dovetail shaped.

6. Building block system according to any one of the preceding claims, wherein the at least one secondary locking strip (11b) are rectangular or dovetail-shaped to fit into the corresponding locking grooves (8a, 8b).

7. Method for building a wall with the building block system, according to claim 1-6, characterized by the steps: a. to attach a first row of building blocks (1) to a substrate with fasteners where the first and second inner surfaces are aligned horizontally, b. if the secondary locking grooves (8b) and the secondary locking strips (11b) are present, to insert secondary locking strips (11b) in the cavities formed by the respective secondary locking grooves (8b) in the third and fourth inner surfaces (6, 7), c. inserting primary locking strips (11) into at least one of the horizontal rectangular primary locking grooves (8a), d. to place a new row of building blocks (1) on top of the previous row of building blocks, e. to repeat steps b-d until the desired height is reached, f. alternatively, if overlying constructions and adjacent side constructions exist, to attach the wall to these with fasteners.

8. Method for building a wall with the building block system, according to claim 7, wherein the secondary locking strip is a dovetail strip and the secondary locking groove has a corresponding dovetail shape and where, in step b, the secondary locking strips are threaded from above into the aforementioned cavities formed by the respective secondary locking grooves (8b).

9. Method according to claim 7 or 8, wherein each row of building blocks is laid in a connecting pattern.

10. Method according to claim 7 or 8 wherein vertically adjacent building blocks are arranged with the secondary locking grooves flush with each other.

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