EP2989263A1

EP2989263A1 - Storey ceiling construction and building made of wood

Info

Publication number: EP2989263A1
Application number: EP14713490.2A
Authority: EP
Inventors: Stefan ZÖLLIG
Original assignee: Timber Structures 30 AG
Current assignee: Timber Structures 30 AG
Priority date: 2013-04-24
Filing date: 2014-03-31
Publication date: 2016-03-02
Anticipated expiration: 2034-03-31
Also published as: US20160258155A1; EP3363961A1; US10132079B2; CH707948A1; RS60776B1; EP2989263B1; WO2014173634A1

Abstract

Storey ceiling construction having a first lower wooden support (5) for supporting a storey ceiling, a first upper wooden support (5) for supporting a further storey ceiling and a first support head (6) made of wood for introducing the forces of the storey ceiling into the first lower wooden support (5). The first support head (6) lies on the first lower wooden support (5). The first upper wooden support (5) is supported directly on the first lower wooden support.

Description

Floor slab construction and wooden building

Technical area

The invention relates to a wooden floor slab construction and a wooden building.

State of the art

It is known to make wooden buildings. In this case, floor slabs are usually placed on floor slab constructions. In general, the supports that carry the projectile, with a

Construct of transverse and / or longitudinal beams connected, and placed on these transverse and / or longitudinal beams, the floor ceiling. Such

Constructions have a number of disadvantages.

If column-free rooms are desired, the wooden cross-members and side members must be adapted in thickness to the load to be supported. For column spacings of 8 by 8 meters, this would mean a thickness of the longitudinal and / or transverse beams of about 1 m. Due to the reduction in the height of the room caused by this thickness, such support distances in timber construction are not possible today with the wooden constructions of the prior art.

The construction of multi-storey buildings in timber construction is limited by the characteristics of the wood. The longitudinal and / or

Cross members lie on a lower support, while the upper support in turn rests on the longitudinal and / or cross member. However, the fiber direction of the longitudinal and / or transverse beams lies in the plane of the floor slab, ie at right angles to the columns. However, wood has the property of being very stable to longitudinal forces acting on the wood, but very weakly perpendicular to the grain. If there is now a support on a transverse and / or longitudinal beam, the entire force of the upper support is transmitted first to the transverse and / or longitudinal beams and only from there to the lower support. Thus, the by the upper support load to be supported limited by the transverse stability of the longitudinal and / or cross member. Multi-storey buildings multiply the

Weight of a support on the transverse and / or longitudinal beams. Therefore, an excessive number of floors in timber construction is not possible today.

Therefore, there are in the prior art no multi-storey buildings with large column distances whose support structures are also made of wood.

In the patent US91 5421 therefore a steel or reinforced concrete support structure is proposed for timber structures. The

Supporting structure has a modular construction of columns and column heads made of steel or reinforced concrete to support the floors of timber structures. This also allows the loads of

Multi-storey buildings are made of wood. However, this has the disadvantage that the support structure can not be made of wood.

DE2108524 discloses a support structure of steel, reinforced concrete or plastic.

Presentation of the invention

It is an object of the invention to find a wooden floor slab construction which allows large pillar distances and multi-storey buildings and which does not require steel or reinforced concrete elements.

According to the invention, this object is achieved with a

Floor slab construction according to claim 1 achieved. The

Floor slab construction has a first lower wooden support for supporting the floor slab, a first upper wooden support for

Supporting another floor slab and a first wooden support head to initiate the forces of the floor slab in the first lower wooden support on. The first column head lies on the first lower one

Wooden support on, and the first upper wooden support is based directly on the first lower wooden support. According to the invention this is further solved by a building with such a floor slab construction.

This has the advantage that a column head of a floor slab can rest on a lower support, and at the same time the force of the upper support can be introduced into the lower support, without directing the force on the un-designed floor ceiling.

The task is further solved by a wooden component, preferably a plate. The wooden component comprising at least a first

Wood layer having a first main fiber direction and at least one parallel to the at least one first layer of wood second wood layer having a second main fiber direction, wherein one of the two outermost layers of wood stratification is a first layer of wood and the other of the two outermost layers of wood stratification is a second layer of wood. Examples of such wooden components are the wooden components of the floor slab.

Such a wooden component has the advantage that it transmits the same force in both main fiber directions.

The task continues through the following

solved column head alone solved.

The problem is further solved by the floor ceiling described below alone.

Further advantageous embodiments are in the

Subclaims specified.

In one embodiment, the first column head has a recess, and the first upper wooden support and / or the first lower wooden support is / are guided through the recess of the first column head, so that the first upper wooden support directly on the first lower

Can support wood support. Through the recess it is achieved that the first column head can rest on the support in the edge region of the recess and, in spite of the closed floor slab, the upper one Support on the lower support rests directly through the recess, without the weight of the upper support acting on the floor ceiling.

In one embodiment, the first upper wood support and the first lower wood support are inserted into the recess of the first support head, so that the first upper wood support within the

Recess of the first column head directly on the first lower

Wooden support is supported. This has the advantage that stabilize the upper and lower support in the recess itself and an extra attachment of one of the supports is unnecessary.

In one embodiment, the first lower wooden support is stepped tapered on the side facing the first column head

formed so that the first lower wooden support is inserted into the recess of the first column head, and the first column head rests with the edge of the recess on the formed step of the first lower wooden support.

In one embodiment, the first lower wooden support and / or the first upper wooden support has a major fiber direction perpendicular to the floor or surface side of the first support head. This has the advantage that the support is designed to be very stable in the direction of support.

In one embodiment, the first wooden support head has a first main fiber direction and a second main fiber direction, wherein the first main fiber direction and the second main fiber direction are perpendicular to each other and disposed in the plane of the floor slab. Due to the rectangular arrangement, forces in the plane of the column head or the floor slab can be optimally transmitted.

In one embodiment, the first column head has a plurality of wood layers, wherein in the plurality of wood layers, a first wood layer having the first main fiber direction alternates with a second wood layer having the second main fiber direction. By the alternating arrangement of the layers with the first and the second major fiber direction in the plane very stable plates are achieved, which can effectively transmit forces in the plane in all directions. This unites the functions of the longitudinal and transverse beams in the floor slab itself.

In one embodiment, the first wood layer has at least two wood elements adjacent to one another in the layer plane in the direction of the second main fiber direction, and / or the second wood layer

Wood layer at least two in the layer plane in the direction of the first main fiber direction juxtaposed wood elements, wherein the at least two wood elements of a wood layer having a wood element of a first type of wood and a wooden element of a second type of wood.

The layering of different types of wood produces areas of the first type of wood, areas of the second type of wood and areas of the first and second types of wood.

In one embodiment, the first wood layer has three wood elements adjacent to one another in the layer plane in the direction of the second main fiber direction, and / or the second wood layer has three wood elements adjacent to one another in the layer plane in the direction of the first main fiber direction, wherein the three wood elements of a wood layer alternately form a wood element first type of wood and a wooden element of a second type of wood. This embodiment is particularly advantageous if in the middle of another type of wood, usually a more stable than to be used in the edge areas.

In one embodiment, the column head has at least one first area with a plurality of wood layers of a first type of wood, at least one second area with a plurality of

Wood layers of a second type of wood and at least a third area with a plurality of layers of wood, in which the first type of wood and the second type of wood alternate.

In one embodiment, the recess is disposed in the second region, and the second species is more stable than the first

Wood. As a result, in the area of the recess, in which the forces concentrate the floor ceiling, using a more stable wood than in the perimeter areas. Thus, the use of expensive wood can be limited to the necessary area around the recess.

In one embodiment, the floor slab construction comprises the floor slab having the first pillar head and a secondary structure, the secondary structure comprising a plurality of wood layers, wherein in the plurality of wood layers a first wood layer having the first main fiber direction with a second wood layer having the second main fiber direction alternates.

In one embodiment, the

Layer thickness and / or the main fiber direction of the plurality of

Wood layers of the secondary structure of the layer thickness and / or the

Main fiber direction of the plurality of wood layers of the column head.

In one embodiment, the secondary structure is connected frontally with an end face of the column head.

In one embodiment, the secondary structure is frontally spaced with a front side of the column head through a gap

arranged, and the substructure is connected to the support head supporting a filled in the gap adhesive layer.

In one embodiment, the uppermost layer of the column head has a major fiber direction perpendicular to the column

Main fiber direction of the lowest layer of the column head is.

In one embodiment, the top layer of the substructure has a major fiber direction that is perpendicular to the major fiber direction of the bottom layer of the substructure.

In one embodiment, the floor slab construction comprises a second lower pillar, a third lower pillar, a fourth lower pillar, a second upper pillar resting on the second lower pillar, a third upper pillar resting on the third lower pillar, a fourth upper support lying on the fourth lower support, wherein the floor slab further comprises a resting on the second lower support second column head, resting on the third lower support third column head and resting on the fourth lower support fourth column head, wherein the secondary structure comprises four first auxiliary support members connecting two adjacent support heads and having at least one second sub-support member connecting the four first sub-support members forming a closed surface of the floor slab between the four first sub-support members.

In one embodiment, the column head forms a parallelepiped having two surface sides parallel to the first and second

Main fiber direction, with two end faces parallel to the first

Main fiber direction are arranged, and with two end faces, which are arranged parallel to the second main fiber direction.

In one embodiment, the floor slab construction has the further floor slab on the upper columns.

Brief description of the figures

The invention will be explained in more detail with reference to the accompanying figures, wherein show

Fig. 1 is a view of a building with the inventive

Ceilings construction;

Fig. 2 is a plan view of a construction of a floor slab;

Fig. 3 is a three-dimensional view of a column head of

Floor ceiling;

Fig. 4A is a plan view of the column head;

4B is a first side view of the column head;

4C is a second side view of the column head;

5 shows a section through a floor slab construction;

Fig. 6 is a three-dimensional view of a portion of the floor slab on a support with a first embodiment of the

In addition to supporting parts; 7 shows a section through a connection of the column head with the first embodiment of a secondary support part; and

Fig. 8 is a section through a connection of the column head with a second embodiment of a secondary support member.

Ways to carry out the invention

Fig. 1 shows an example of a building 1 with a

Floor slab construction according to the invention. The building has a base plate 3, three storey ceilings 2 and an upper floor ceiling 4. Each floor 2 and 4 lies on at least one support 5. Preferably, but without limiting the invention, is a

Floor 2 or 4 on at least four columns.

FIG. 2 shows an exemplary embodiment of a floor slab 2. The floor slab 2 consists of a plurality of support heads 6, of a plurality of first auxiliary support parts 7 and a plurality of second auxiliary support parts 8. The first auxiliary support parts 7 and the second auxiliary support parts 8 form a secondary structure of the floor slab second

Each column head 6 has a recess 9, which is formed, an upper support 5, which is arranged between the floor slab 2 and an overlying floor slab, directly on a lower support 5, which supports the floor slab 2, support. Direct support should mean that the force of the upper support 5

is introduced mainly into the lower support 5 and only a small or vanishing proportion of the force is introduced into the floor 2. This can be achieved by resting the upper support 5 on the

underlying support 5 done or by resting the upper support 5 on a wooden transmission element, the one

Main fiber direction parallel to the main fiber direction of the upper and lower support 5 and in turn rests on the lower support 5. This allows weight of the upper floors directly above superimposed columns down to the foundation

be removed without that any of the floors 2 of the collected weight of the superposed floors must be able to resist. Thus, the load of a single support 5 is no longer on the resistance perpendicular to the fissure of the floor ceiling, but only by the essential higher

Resistance of the supports limited in the longitudinal direction of the Faser.

Fig. 3 shows a three-dimensional view of the insulated from the floor slab 2 support head 6. The support head 6 forms a plate with two surface sides 10 and four end faces 1 1. In most cases, the surface of the surface sides 10 is greater than that of the end faces 1 first however, invention is not limited thereto. The plate preferably forms a cuboid, i. the six sides 10 and 1 1 are perpendicular to the sides adjacent to you. However, the support head 6 can also form other plate shapes and also the end faces can be formed obliquely, concave or convex instead of rectangular.

The first auxiliary bearing parts 7 in Fig. 2 are preferably also cuboid with two surface sides and four end faces formed. Each first auxiliary carrying part 7 connects two support heads 6. For this purpose, an end face of the first auxiliary carrying part 7 is connected to an end face 11 of one of the support heads 6. The end face 1 1 of a further column head 6 is also connected on the opposite end face of the secondary support member 7 on the front side of the first auxiliary support member 7. Everyone

Column head 6 is connected to two, three or four end faces 1 1 with the end face of a first secondary support member 7, depending on whether the support head 6, at a corner, at the edge or in the middle of the building or the floor ceiling. Thus, four support heads 6, which are each connected to four first auxiliary bearing parts 7 form a square or a rectangular plate whose center has a square or rectangular recess.

The second auxiliary bearing parts 8 are preferably also cuboid with two surface sides and four end faces. The recess between the four first auxiliary bearing parts 7 is closed by at least one second auxiliary bearing part 8. In Fig. 2, two second auxiliary bearing members 8 are used to close the recess. Each second auxiliary carrying part 8 in FIG. 2 thus connects with the four end faces the end faces of three first auxiliary carrying parts 7 and

adjacent another second secondary support part 8.

The column head 6 is made of wood. The wood is preferably plywood, e.g. Cross laminated or veneered plywood, with wood fibers differently oriented in adjacent layers. 4A, B, C show an example of a wooden structure of the column head 6. FIG. 4A shows a plan view of the upper surface side 10 of the column head 6. FIGS. 4B and 4C each show an end face 11 of the column head 6. In FIGS. 4B and 4C, the layer structure of the column head 6 is clearly visible. The column head 6 consists of alternating first layers 12 and second layers 13. The first layers 12 are made of wood with a first one

Main fiber direction 14, the second layers 13 are made of wood with a second main fiber direction 1 5. Preferably, the first

Main fiber direction 14 and the second main fiber direction 1 5

different directions. Preferably, the first main fiber direction 14 is arranged at right angles to the second main fiber direction 15. The first and second main fiber directions 14 and 15 are both arranged in the plane of the layers. The main fiber directions 14 and 15 intersect the four end faces 11 and run parallel to the two surface sides 10. Preferably, each main fiber direction 14 and 15 is parallel to two end faces 11 and perpendicular to the remaining two end faces 11. Due to this structure, the column head can move in both the direction of the first main fiber 14 and in the direction of the second

Main fiber direction 15 forces transmitted well.

Since the whole forces on the floor 2 to the ceiling

Stanchion heads 6 have to be guided and from there must be transported away via the supports 5, the support heads 6, in particular the region of the support heads 6 are exposed to the recess 9 the highest forces within the floor 2. That is why the

Prop head 6 preferably solid. By doing

Embodiment in Fig. 4A, 4B, 4C, the column head 6 is formed of two types of wood. Each layer consists of three juxtaposed wooden elements, which are in the respective main fiber direction 14 or 1 5 extend the layer over the entire length of the support head 6 and are perpendicular to the corresponding main fiber direction 14 or 1 5 of the layer next to each other. Here are the outer two

Wooden elements of a layer of a first type of wood 16 formed, and arranged between the outer two wooden elements central

Wooden element of the same layer of a second type of wood 17 is formed. In Fig. 4A, the uppermost layer of the column head 6, which is a first layer

12 is to see. As described, the two outer ones exist

Wood elements of the first type of wood 16 and the central wood element of the second type of wood 17. The three wood elements of the top layer each extend in the direction of the first main fiber direction 14 over the entire length of the support head 6 and are arranged in the direction of the second main fiber direction 1 5 side by side. Fig. 4A shows the same dashed lines the wood elements of lying directly under the top layer second layer 13. Again, there are the two outer wood elements of the first type of wood 16 and the center

Wood element of the second type of wood 17. The three wood elements of lying under the top layer second layer 13 and all other second layers 13 each extend in the direction of the second main fiber direction 1 5 over the entire length of the support head 6 and thus at right angles to the wood elements of the uppermost Layer and all other first layers 12. The three wood elements of the lying below the top layer second layer 13 and all other second layers

13 are arranged side by side in the direction of the first main fiber direction 14. Thus, nine different areas are formed by the stratification described. Due to the central arrangement of the central wood element of each layer, a central region of the support head 6 is formed, in which all the central wood elements intersect, and thus consists exclusively of the second type of wood 17. Due to the central arrangement of the recess 9, the border of the recess 9 thus consists of the second type of wood 17. In the four corners are only wood elements consisting of the first type of wood 16 on top of each other, so that here four areas form, only from the first kind of wood 16 exist. In the four remaining areas, the wood types 16 and 17 change from layer to layer. If one now chooses the second type of wood 17 more stable than the first type of wood 16, it forms in the center of the Support head 6 in the region of the recess 9 greater stability than in the edge regions. Different types of wood can include not only different types of trees, but also different types of processing of the wood of the same tree species. For example, the first type of wood 16 may be spruce plywood, and the second type of wood 17 may be beech veneered plywood. Since beech is harder than spruce, the central area is more stable.

Fig. 5 shows a section through a support head 6 and through an upper and lower support 5. The lower support 5 has a cross-section which is larger than the recess 9 of the support head 6. At the upper end of the lower support 5 reduces the cross-section the lower support 5 to the cross section of the recess or smaller. As a result, a step 18 is formed, on which the support head 6 can rest. To support the floor slab 2, the reduced cross-section of the lower support 5 is inserted into the recess 9 of the support head 6 until the support head 6 rests on the step 18. The upper support 5 also has a reduced cross-section at the bottom, which is also inserted into the recess 9 of the support head until the upper support 5 rests on the lower support. As a result, the weight force can be transmitted from the floor slab 2 via the step 18 to the lower support 5. At the same time, the weight of the upper support 5 can be transferred to the lower support 5 without additional load for the floor slab 2.

6 shows an exemplary embodiment of a projectile plane 2 with a lower support 5. In this embodiment, the first auxiliary support part 7 and the second auxiliary support part 8 have a hollow box structure of transverse struts arranged at right angles to one another, which is covered at the top and bottom by at least one layer of wood. The at least one layer of wood on the top and bottom consists in this embodiment each of two layers, which are not shown here for better representation of the hollow box structure. The layers on and below the hollow box structure alternately have a first and a second layer each having a first main fiber direction 14 and a second main fiber direction 15. The layers on and under the Box body structure of the first and second side support members 7 and 8 are compared to the support head 6 formed so that the first layers opposite to the end faces of the support head 6 and the first or second side support member to be connected 7 or 8 and correspondingly also the second layers. Thus, the

Floor 2 in each layer on and below the hollow box structures of the first and second secondary supporting parts 7 and 8 and the corresponding layer of the column head 6 over the entire plane of the floor slab 2, the same main fiber direction.

Fig. 7 shows a section through the junction between the support head 6 and the first auxiliary bearing member 7. The bearing end face connection between an end face 1 1 of the support head 6 and an end face of the first auxiliary bearing member 7 is by a

Adhesive layer 19 reached.

FIG. 8 shows an alternative embodiment of the side-carrying parts 7 and 8. The first and second side-carrying parts 7 and 8 are made of solid wood having alternately first layers 12 and second layers 13. The layers are the same in the column head 6, in the first side-carrying part 8 and the second side-carrying part 9

arranged so that the layers of the same main fiber direction opposite to the end faces of all parts to be joined. Thus, the floor slab 2 in each layer has the same main fiber direction.

Thereby, in each layer of the floor slab 2, the force is transmitted in either the first main fiber direction 14 or the second main fiber direction 15. The load-bearing end connection between an end face 1 1 of the support head 6 and an end face of the first auxiliary support member 7 is achieved by an adhesive layer 19.

The achievement of a bearing connection is achieved as follows. First, the end faces of the parts to be joined are arranged so that the layers of the same main fiber direction

lie opposite and form the parts to be joined a gap between the end faces. In this position, the two become

fixed connecting parts. The gap between the parts to be joined is sealed at the edges, eg by filling. Thereafter, the gap of the gap 19 is filled with adhesive. When the adhesive has cured, there is a load-bearing connection. The adhesive used is preferably a two-component adhesive, the two components of which are mixed during filling into the gap 19. By mixing the two components, the adhesive begins to cure. As adhesive, for example, the adhesive PURBOND CR 421 of

Swiss company Purbond tested. This two-component polyurethane casting resin is approved by the Deutsches Institut für Bautechnik under the approval number Z-9.1 -707 for gluing steel rods into load-bearing timber components and is freely available. This adhesive measured a bond between two wooden elements with tensile strengths of up to 20 Newton per square millimeter (N / mm ² ). By this technique, the formation of large floor slabs 2 by the frontal bonding of support heads 6, secondary supporting parts 7 and 8 is possible, which distribute the force over the entire plane of the floor slab 2 evenly and transfer to the supports 5. Alternatively, instead of bonding, the compound may also be replaced by alternative bonding agents

Steel connection means are created.

Preferably, all parts of the floor slab 2, that is, the support heads 6, the first auxiliary bearing parts 7 and the second

Secondary support parts 8, constructed so that the top layer of a

Main fiber direction, which is perpendicular to the main fiber direction of the bottom layer. In the prior art, the top and bottom layers are always in the same main fiber direction

trained, otherwise warped the plates. However, this has the disadvantage that the plates in the main fiber direction of the top and bottom layers are more stable than in the other of the two main fiber directions of the plate. Therefore, the drawback of plate warping is intentionally taken into account here in order to create plates which are in both

Main fiber directions are equally stable.

Due to the floor slab construction according to the invention for a floor slab 2, the force can now be applied to a floor slab 2 in the plane of the floor slab 2 itself and not via separate supports in one Prop 5 will be initiated and at the same time the forces of the upper

Floors of the upper support 5 directly to the lower support 5 are introduced. By using the floor slab 2 itself as a force-transmitting element, eliminating additional support for the

Floor 2 and the floor 2 ceiling can be made thinner than a corresponding carrier. This construction enables floor slabs 2 to be achieved with column spacings of eight by eight meters. The floor slab 2 preferably forms a plate of the same thickness over the entire plane of the floor slab, which itself acts as a supporting element for the floor slab 2 and requires no additional supporting support.

When used in this application, the terms below or above, as referred to below in the direction of

Earth gravity and up in the direction of Earth's gravity.

In the described embodiment, the first and second main fiber directions 14 and 15 of the adjacent layers of the elements of the floor slab were perpendicular to each other. Other angles between the major fiber directions and a greater number of major fiber directions could also occur. Thus, the three different layers could have major fiber directions, each at a 60 ° angle to each other, so that transmissions in the

Floor level works along three directions. Thus, the forces could possibly be better directed to the column head. However, such constructions are more complicated.

The invention is not limited to the described embodiment. Each embodiment included in the wording of the independent claims is included in the invention.

Claims

claims

1 . A floor slab construction comprising a first lower wooden support (5) for supporting a floor slab (2), a first upper wooden support (5) for supporting a further floor slab (2, 4) and a first support head (6) made of wood for introducing the forces of

Floor (2) in the first lower wooden support (5), wherein the first column head (6) on the first lower wooden support (5) rests, and the first upper wooden support (5) is supported directly on the first lower wooden support.

2. Floor slab construction according to the preceding claim, wherein the first column head (6) has a recess (9), and the first upper wooden support (5) and / or the first lower wooden support (5) in the recess (9) of the column head (6 ) is guided so that the first upper wooden support (5) can be supported directly on the first lower wooden support (5).

3rd Floor construction according to one of the previous

Claims, wherein the first lower wooden support (5) is tapered stepped on the side facing the first column head (6), so that the first lower wooden support (5) in a recess (9) of the first column head (6) is inserted, and first column head (6) with the edge of the

Recess (9) on the trained stage of the first lower

Wooden support (5) rests.

4. Floor slab construction according to one of the previous

Claims, wherein the first lower wooden support (5) and / or the first upper wooden support (5) has a main fiber direction perpendicular to the floor slab (2).

5. Floor slab construction after one of the previous ones

Claims, wherein the first support head (6) made of wood, a first

Main fiber direction (14) and a second major fiber direction (1 5), which differs from the first main fiber direction, wherein the first Main fiber direction (14) and the second main fiber direction (15) in the plane of the floor slab (2) are arranged.

6. storey ceiling construction according to the preceding claim, wherein the first main fiber direction (14) and the second

Main fiber direction (1 5) are arranged at right angles to each other.

A decking construction according to claim 5 or 6, wherein the first column head (6) comprises a plurality of wood layers (12, 13), wherein in the plurality of wood layers a first wood layer (12) having the first main fiber direction (14) is formed with a second one

Wood layer (13) with the second main fiber direction (1 5) alternates.

8. Floor slab construction according to the preceding claim, wherein the first wood layer (12) has at least two in the layer plane in the direction of the second main fiber direction (1 5) adjacent wood elements and / or the second wood layer (13) at least two in the layer plane in the direction of first main fiber direction (14) has juxtaposed wooden elements, wherein the at least two wooden elements of a layer of wood, a wooden element of a first kind of wood

(16) and a wood element of a second kind of wood (17).

9. Floor slab construction after one of the previous ones

Claims, wherein the first column head (6) comprises at least a first region having a plurality of wood layers of a first species of wood (16), at least a second region having a plurality of layers of wood of a second species of wood (17) and at least a third region having a plurality of layers of wood in which the first wood species (16) and the second wood species are found

(17) alternates, has.

10. Floor slab construction according to the preceding claim, wherein the recess (9) is arranged in the second region, and the second kind of wood (17) is more stable than the first kind of wood (16).

1 1. Floor slab construction according to one of claims 7 to 10 comprising the floor slab (2), wherein the floor slab (2) the first support head (6) and a secondary structure, wherein the

Substructure has a plurality of wood layers (12, 13), wherein in the plurality of wood layers, a first wood layer (12) with the first main fiber direction (14) with a second wood layer (13) with the second main fiber direction (1 5) alternates.

12. Floor slab construction according to the preceding claim, wherein the secondary structure is connected to the front side with an end face (1 1) of the first column head (6).

13. Floor slab construction according to the previous claim, wherein the secondary structure frontally with an end face of the first

Stanchion head (6) is arranged spaced apart by a gap, and the substructure is connected to the first column head via a filled in the gap adhesive layer.

14. A decking construction according to any one of claims 11 to 13, wherein the uppermost layer of the first column head (6) and / or the secondary structure has a major fiber direction perpendicular to the main fiber direction of the lowest layer of the first column head (6) and / or the secondary structure stands.

1 5. Floor slab construction according to one of claims 1 1 to 14, comprising a second lower wooden support (5), a third lower wooden support (5), a fourth lower wooden support (5), on the second lower wooden support (5) resting second upper wooden support (5), a third upper wooden support (5) lying on the third lower wooden support (5), a fourth upper wooden support (5) resting on the fourth lower wooden support (5), the floor covering (2) continuing on the second has a second column head resting on the lower wooden support (5), a third column head (6) lying on the third lower wooden column (5) and a fourth column head (6) lying on the fourth lower wooden column (5), the secondary panel being four first

Secondary support members having two adjacent support heads (6) connect and at least one second side support member (8), which has the four connecting first auxiliary bearing parts (7) and forming a closed surface of the floor slab (2) between the four first auxiliary bearing parts (7).

16. Building comprising a floor slab construction according to claim 1 to 14.