LIGHTWEIGHT CONSTRUCTION ELEMENT, MANUFACTURING METHOD THEREFOR, USE OF SAME, AND LIGHTWEIGHT PANEL AND INSULATING MATERIAL

Abstract

A lightweight construction element (1) comprises at least one lightweight panel (2) and a layer of insulating material (4) associated with the lightweight panel (2), wherein the at least one lightweight panel (2) comprises boards (6), which, on at least one of the main surfaces (8) thereof, have a group of grooves (9) running parallel and which boards (6) are arranged in at least one layer (5) and are connected to one another via adhesive bonds. The layer of insulating material (4) comprises wood chips (19), which are removed from starting boards during the manufacture of boards (6) for the lightweight panels (2). These lightweight construction elements have good load and thermal insulation properties. The material used originates from one source and achieves a large overall volume after processing.

Claims

1. A lightweight construction element comprising at least one lightweight panel and a layer of insulating material associated with the lightweight panel, wherein the at least one lightweight panel comprises boards, which, on at least one of the main surfaces thereof, have a group of grooves, which run parallel, and which boards are arranged in at least one layer and are connected to one another via adhesive bonds, wherein the layer of insulating material comprises wood chips, which are removed from starting boards during the manufacture of boards comprising grooves for the lightweight panel.

2. The lightweight construction element according to claim 1, wherein, at least a part of the grooves of the boards of the at least one lightweight panel have a groove width increasing away from the main surface towards the interior of the board and the webs of wood formed between these grooves accordingly becoming wider from the interior of the board towards the main surface and having a wide web surface on the main surface.

3. The lightweight construction element according to claim 1, wherein the at least one lightweight panel comprises at least two layers, and each layer is formed by boards comprising grooves, wherein the boards of each layer are connected to one another on the side edges thereof and the directly adjoining layers are connected on the main surfaces of the boards thereof via adhesive bonds, and grooves, which face one another, of different layers, which are connected to one another, run at an angle to one another.

4. The lightweight construction element according to claim 1, wherein, in at least a part of the layers the boards have on both main surfaces a group of grooves, which run parallel, and preferably a second group of parallel grooves at an acute angle to the first group grooves of this main surface.

5. The lightweight construction element according to claim 1, wherein the wood chips of the insulating material are substantially embodied in a strip-shaped and flat, corrugated, roll-shaped, spring-shaped or spiraled manner, and at least 80 percent by weight of the wood chips of the insulting material are formed by wood chips of a length in the range of between 2 mm and 40 mm.

6. The lightweight construction element according to claim 1, wherein the wood chips of the insulating material, together with a binding agent, form a substantially cohesive structure, the binding agent, comprises at least a portion of an organic binder and/or of an inorganic binder, wherein preferably the binder comprises tannin, preferably the organic binder comprises a polymer binder, preferably polyvinyl acetate (PVAc), and preferably the inorganic binder is an alkali polysilicate-based binder, preferably a mixture of sodium silicate and/or potassium silicate comprising lithium silicate.

7. A method for manufacturing a lightweight construction element comprising at least one lightweight panel and a layer of insulating material associated with the lightweight panel, wherein the at least one lightweight panel comprises boards, which, on at least one of the main surfaces thereof, have a group of parallel grooves and which are arranged in at least one layer and are connected to one another via adhesive bonds, wherein wood chips are removed from starting boards and are at least partially used to manufacture the layer of insulating material, where the boards with grooves are joined to form at least one layer of the lightweight panel.

8. The method according to claim 7, wherein at least one cavity, into which the wood chips are filled preferably together with a binding agent for manufacturing the layer of insulating material, is formed on the lightweight construction element between the at least one lightweight panel and at least one further panel, wherein the wood chips and the binding agent are preferably in each case oppositely charged electrically during the filling of the cavity, so that a mixing, which is as complete as possible, is ensured thereby.

9. The method according to claim 7, wherein wood chips are applied in a layered manner via at least one application device to a carrier belt so as to manufacture the layer of insulating material, a binding agent is applied to the wood chips (19) via a nozzle arrangement, and a pressing belt presses the wood chips, which are provided with the binding agent, against the carrier belt on a hardening path, wherein the carrier belt and/or the pressing belt preferably has separating elements for separating sections of the layer of insulating material, and preferably the wood chips and the binding agent are oppositely charged electrically for application or impacting, respectively, so that a mixing, which is as complete as possible, is ensured thereby.

10. The method according to claim 7, wherein, based on 1 m.sup.3 of wood in the form of raw boards of a weight of substantially 450 kg, 30 to 60 percent by weight, preferably substantially 180 kg of this wood material ends up in lightweight panels, the cavity portion of which is preferably in a range of between 30% and 50%, and that between 100 kg and 270 kg, preferably substantially 200 kg, of the removed residual material is used for the production of insulating material, wherein the density of the insulating material is in the range of between 60 and 90 kg/m.sup.3 and insulating material with a volume in the range of between 1.5 m.sup.3 and 3.5 m.sup.3 is preferably provided in the lightweight construction panels in addition to the wood material.

11. A lightweight panel comprising boards or comprising sections of boards, which boards or sections, respectively, have a group of grooves, which run parallel on at least one of the main surfaces thereof and are arranged in at least one layer and are connected to one another, wherein, at least a part of the grooves of the boards or sections, respectively, of the at least one lightweight panel, have a groove width increasing away from the main surface towards the interior of the board or section, respectively, and the webs of wood formed between these grooves accordingly becoming wider from the interior of the board or section, respectively, towards the main surface, and having a wide web surface on the main surface.

12. The lightweight panel according to claim 11, the lightweight panel comprising at least two layers and each layer is formed by boards comprising grooves, wherein the boards of each layer are connected to one another on the side edges thereof and the directly adjoining layers are connected on the main surfaces of the boards thereof via adhesive bonds, and grooves, which face one another, of different layers, which are connected to one another, run at an angle to one another.

13. The lightweight panel according to claim 11, wherein in at least a part of the layers the boards have a group of grooves running parallel on both main surfaces, and a second group of parallel grooves is preferably formed at least on one main surface at an acute angle to the first group of grooves of this main surface.

14. The lightweight panel according to claim 11, wherein cut short sections of the same length of lightweight panels, where the main surfaces of the boards run parallel to the outer surface of the lightweight panel, are rotated by 90, are arranged next to one another in one layer and are brought into mutual connection with the partial surfaces of the outer surfaces of the divided lightweight panels, so that they form a layer of sections, wherein the cut surfaces of the connected sections form the outer surfaces of the layer of the short sections and a cover layer is preferably arranged on at least one of these outer surfaces.

15. (canceled)

16. An insulating material comprising wood particles and binding agent, wherein the wood particles are wood chips, which are removed from starting boards during the manufacture of boards (6) comprising grooves, wherein the wood chips are substantially embodied in a strip-shaped and flat, corrugated, roll-shaped, spring-shaped or spiraled manner, and at least 80 percent by weight of the wood chips of the insulting material are formed by wood chips of a length in the range of between 2 mm and 40 mm and the wood chips, together with the binding agent, form a substantially cohesive structure, the binding agent comprises at least one portion of an organic binder and/or of an inorganic binder, wherein the binder preferably comprises tannin, the organic binder preferably comprises a polymer binder, preferably polyvinyl acetate (PVAc), and the inorganic binder is preferably an alkali polysilicate-based binder, preferably a mixture of sodium silicate and/or potassium silicate comprising lithium silicate.

Description

[0082] The invention will be specified in more detail by means of the drawing.

[0083] FIGS. 1, 2, 2a show sections through lightweight construction elements, which are connected to one another,

[0084] FIGS. 3 and 4 show schematic illustrations for the manufacture of grooves,

[0085] FIGS. 5 and 6 show front views of boards, which were processed analogously to FIGS. 3, 4,

[0086] FIG. 7 shows a front view of a board comprising grooves of different depths,

[0087] FIG. 8 shows a perspective illustration of layers of a lightweight panel,

[0088] FIG. 9 shows a perspective illustration of a building structure comprising lightweight construction elements,

[0089] FIGS. 10 and 11 show views of sections of lightweight panels,

[0090] FIG. 12 shows a schematic illustration for filling insulating material into a cavity of a lightweight construction element,

[0091] FIG. 13 shows a schematic illustration for manufacturing mat-shaped insulating material,

[0092] FIGS. 14 to 16 show visualizations of different wood chip distributions,

[0093] FIG. 17 shows a visualization of a section of a mat-shaped insulating material and

[0094] FIG. 18 shows a section through lightweight panels, which are connected to one another, which can be used as interior walls.

[0095] FIG. 1 shows a section of three lightweight construction elements 1, which are connected to one another at side faces and which in each case comprise a lightweight panel 2 on both lateral outer surfaces. At the side faces arranged frame parts 3 hold the two lightweight panels 2 of each lightweight construction element 1 at a predetermined distance to one another, so that a cavity is embodied in the interior of the lightweight construction element 1. In the illustrated embodiment, the cavity is filled with insulating material 4. This insulating material 4 can either be filled in in the form of wood chips, preferably comprising binding agent, or can be inserted as insulating material mat when assembling the lightweight construction element 1. The lightweight panels 2 are formed by boards, which have a group of grooves, which are not illustrated, which run parallel on at least one of the main surfaces thereof.

[0096] FIG. 2 shows an embodiment analogous to the embodiment in FIG. 1, wherein the lightweight panels 2 comprise three (in FIG. 8 four) layers 5. Each layer 5 is formed by boards 6 (see FIGS. 3 to 7). The boards 6 of each layer 5 are connected by means of adhesive bonds on the side edges 7 thereof and preferably have grooves 7a and tongues 7b at that location (see FIGS. 3, 5, 8). The directly adjoining layers 5 are connected via adhesive bonds on the main surfaces 8 of their boards 6. The frame parts 3 arranged at the side faces engage with second groove tongue arrangements 5a of the lightweight panels 2 by means of first groove tongue arrangements 3a, wherein these engaging groove tongue arrangements 3a, 5a are glued to one another. So that the lightweight construction elements 1 can be connected at the side faces to one another in a simple manner at a construction site, the frame parts 3 have connecting grooves 3b, which are widened inwards, so that slats 30, which are tapered in the center, hold the lightweight construction elements 1 together after the insertion into the connecting grooves 3b.

[0097] The boards 6 have a group of grooves 9, which run parallel, at least on one of the main surfaces 8 thereof (see FIGS. 3 to 7). In a preferred embodiment, the grooves 9 run parallel to the longitudinal board direction or to the side edges 7, respectively. The grooves 9, which face one another, of layers, which are connected to one another, run at an angle to one another. In the embodiment according to FIG. 8, the longitudinal board directions run at an acute angle to one another in directly adjoining layers 5. When boards 6 are comprising grooves 9 in longitudinal board direction, then directly adjoining layers 5 have grooves 9 running at an acute angle to one another.

[0098] FIG. 2a shows an advantageous clamping connection, where frame parts 3 comprising first groove tongue arrangements 3a engage with second groove tongue arrangements 5a of the lightweight panels 2 on both lightweight construction elements 1, which are to be connected, wherein these engaging groove tongue arrangements 3a, 5a are glued to one another. So that the lightweight construction elements 1 can also be connected easily to one another at a construction site, the frame parts 3 have connecting grooves 3b. A clamping device 30a, 30b, 30c makes it possible to move the grooves, which face one another, of lightweight construction elements, which are to be connected, by means of contact surfaces 30c of the clamping device in response to clamping.

[0099] In the illustrated embodiment, each lightweight construction element 1 comprises two grooves 3b, which are embodied in a mirror-inverted manner relative to a central plane of the lightweight construction elements 1 on two groove parts 3, which are connected to one another. The clamping device preferably comprises at least one arrangement comprising two clamping elements 30a, which are formed in a mirror-inverted manner and which can be moved towards one another by means of at least one clamping screw 30b, wherein guide surfaces 30c of the clamping elements 30a run in engagement with matching groove surfaces at an acute angle to the screw axis and are oriented in such a way that the lightweight construction elements 1, which are to be connected, are moved into the desired contact position by means of the forces acting on the groove surfaces when the clamping elements 30a move towards one another.

[0100] The axes of the clamping screws 30b are at right angles, in particular substantially vertically, to the large outer surfaces of at least one of the two lightweight construction elements 1 and can be operated from one side of the lightweight construction element 1. When the tight connection is fixed by means of an adhesive, the clamping screws can be removed after the adhesive has hardened, and a connection, which is free from metallic elements, is created. If the desired connection is embodied so as to be firm, the clamping device can be provided with an insulating material, if necessary, which is not illustrated, in particular with an insulating strip, and can be covered by means of cover strips 30d. The cover strips are introduced between the large edge surfaces of the connected lightweight construction elements 1.

[0101] FIGS. 3 and 4 show the removal of wood chips from boards 6 in a schematic manner. For this purpose, circular saw blades 10 are arranged, for example six, on a common shaft 11 at regular intervals by means of spacers 12. With rotating circular saw blades 10 the boards 6 are moved in the longitudinal direction thereof below the shaft 11, wherein, with their outer edge, the circular saw blades engage with the boards 6 according to the desired groove depth.

[0102] In a first non-illustrated processing area, circular saw blades of the same size are arranged on a shaft, which is oriented parallel to the main surface 8 of the boards 6 and vertically to the longitudinal board direction. The central area of the grooves 9 is embodied by means of these circular saw blades. If the grooves are formed on both main surfaces 8 of the boards 6, a shaft comprising circular saw blades of the same size is used above and below the boards.

[0103] In a second processing area, a shaft 11 is used, which is oriented at an acute angle to the main surface 8 to be processed of the boards 6 and on which circular saw blades 10 comprising an increasing diameter are arranged at predetermined intervals. The shaft 11 is located in a plane, which stands vertically on the main surface 8 of the boards 6 and which is oriented vertically to the longitudinal axes of the grooves 9. The angle between the shaft 11 and the main surface 8 as well as the diameters of the circular saw blades 10 and the positions thereof on the shaft 11 are matched to one another in such a manner that all circular saw blades form grooves of substantially the same depths. Due to the inclined shaft 11, a disk angle =90 is formed between the planes of the circular saw blades 10 and the main surface 8.

[0104] According to the incline of the circular saw blades or of the disk angle , respectively, the disk angle is also formed between the lateral edge surfaces of the grooves 9, which are created, and the main surface 8 of the board 6. So that the grooves 9 do not maintain the asymmetric form in sectional planes vertically to the longitudinal groove direction, a further shaft 11, which comprises circular saw blades 10 and which is oriented at a further acute shaft angle to the main surface 8 of the boards 6, is assigned to the same main surface 8 according to FIG. 4. This further shaft 11 is oriented in a mirror-inverted manner to the shaft 11 of FIG. 3 relative to a mirror plane, which stands vertically on the main surface 8 and which comprises the central longitudinal axis of the board 6, and is additionally arranged slightly offset to the first shaft in longitudinal board direction.

[0105] The processing by means of the inclined shafts 11 and the circular saw blades 10 of different sizes, which are fastened thereto, preferably takes place on both main surfaces 8 of the boards 6, thus from above and from below.

[0106] The used shafts 11 comprising the circular saw blades 10 are matched to one another in such a manner that substantially symmetrical groove cross sections are present after the processing of a main surface 8 with all shafts 11, wherein the groove width becomes larger away from the main surface 8 towards the interior of the board 6. The groove opening on the main surface 8 corresponds at least to the expansion of the circular saw blades 10 in the main surface 8 vertically to the longitudinal groove direction. Webs 14 of wood, which become wider from the interior of the board 6 towards the main surface 8 and which have a wider web surface 15 on the main surface 8, remain between the grooves 9. These wide web surfaces 15 ensure sufficiently large contact surfaces for a stable adhesive bond by gluing layers 5, and this independent from the angle between the grooves 9 in the adjoining main surfaces 8 of the two layers 5.

[0107] A central cohesive wood layer 13 can absorb forces, which are applied into the grooved board 6 via the side edges 7. After the gluing of layers comprising grooves, which are oriented differently, these transverse forces are absorbed by the webs 14 of the adjoining layer 5, because these webs 14 run aslant to the side edges 7 of the boards 6 of the first layer 5.

[0108] The boards 6 of FIGS. 5 and 6 are arranged directly below the boards of FIGS. 3 and 4, so that it can be seen that the position of the webs 14 relative to the side edges 7 can be adjusted by means of the lateral positioning of the boards 6 relative to the circular saw blades 10. According to FIGS. 5 and 6, the arrangement of the webs 14 is chosen in such a manner that the webs 14, which lead away from the central cohesive wood layer 13 on both sides, are embodied so as to be substantially mirrored to a central plane. Compressive forces, which are absorbed by the webs 14 via the wide web surfaces 15 on the first main surface 8, can thus be transferred directly to the webs 14, which extend towards the second main surface 8, in the center of the board 6. This embodiment, which is designed for high compressive loads of the main surfaces 8, is suitable, for example, for lightweight construction elements, which are used for floors or ceilings, respectively.

[0109] According to FIGS. 3 and 4, the webs 14 of the two main surfaces 8 are displaced relative to one another, so that grooves 9 on the second main surface 8 are assigned to the webs 14 on the first main surface 8. So that compressive forces can be transferred from one main surface 8 to the other main surface in a desired manner, the central wood area 13 is embodied in such a manner that the forces from one web 14 of the first main surface 8 are divided or transferred, respectively, as optimally as possible on two adjacent webs 14 of the second main surface 8. It is advantageous for building walls in earthquake-prone regions, when high deformation energies do not lead to the complete breakage of the lightweight panel 2, but create large deformations in the panels 2, in particular with local material tears on the central cohesive wood layer 13.

[0110] FIG. 7 shows a board 6, the grooves 9 of which were prepared by means of circular saw blades of different sizes, wherein the circular saw blades are arranged on two shafts, which are parallel to the board main surfaces, below and above the board. So that a central cohesive wood layer 13 substantially has a constant thickness, the diameters of the circular saw blades, which are assigned to one another, below or above the board 6, respectively, are matched to one another.

[0111] FIG. 9 shows the use of lightweight construction elements 1 for erecting a house 16 in a schematic manner. In the illustrated embodiment, tightening straps 17, to which the desired clamping force can be applied by means of clamping devices 18, are illustrated for bracing the house 16. It goes without saying that the tightening straps 17 can also consist of strap sections, wherein the strap sections are arranged in the lightweight construction elements 1 and can be connected and tightened, if necessary, via connecting devices during erection of the house 16, so that substantially nothing of the tightening straps 17 and the connecting devices appears on the exterior of the house 16.

[0112] FIGS. 10 and 11 in each case show a section 31 of a lightweight panel, where the main surfaces 8 of the boards 6 run parallel to the outer surface of the lightweight panel and the boards 6 of both or of all layers, respectively, are oriented in parallel. The sections 31 extend vertically to the drawing plane only over a short distance. After separating a plurality of sections 31 of the same lengths, they are rotated by 90 and are arranged in a layer directly adjoining one another at the long side edges 32, which are formed by the sections of the main surfaces 8. The sections 31 of FIGS. 10 and 11 would thus be pushed against one another in the illustrated position and would be brought into mutual connection with the partial surfaces of the outer surfaces of the divided lightweight panels or the sections of the main surfaces 8, respectively, via an adhesive bond. Together, a plurality of such sections 31 form a layer, wherein the cut surfaces of the joined sections 31 form the outer surfaces of this layer. If the structure of this layer is to not be visible, cover layers are arranged on both outer surfaces of the layer and on the side edges or front sides thereof, respectively.

[0113] The sections illustrated in FIGS. 10 and 11 were separated from lightweight panels, where the groove widths become larger away from the main surface 8 towards the interior of the boards 6, wherein ridges 33 made of wood, which protrude into the grooves on the groove base, were left. This means that circular saw blades, which were only inclined in two different directions, were used when forming these grooves, and that the use of circular saw blades, which are oriented vertically to the main surface of the boards, was forgone. Accordingly, substantially only narrow cavities, which have a small expansion in one direction, which corresponds to the thickness of the circular saw blade, by means of which the groove was formed, is present in the lower area of the grooves. This thickness is preferably substantially 4 mm.

[0114] In the embodiment according to FIG. 10, lightweight panels were used, where the boards correspond to FIGS. 3 and 4 except for the ridges 33, which were left, and in the embodiment according to FIG. 11, the boards correspond to FIGS. 5 and 6, except for the ridges 33. A further difference of the embodiments of FIGS. 10 and 11 is that in FIG. 10, the web surfaces 15 of the boards 6, which are connected to one another on the main surfaces 8, substantially meet one another exactly and that the web surfaces 15 span the access openings to the grooves 9 of the adjoining boards 6 in FIG. 11.

[0115] FIG. 12 shows a step of a method, where wood chips 19 and binder 20 are introduced as insulating material into a cavity of a lightweight construction element 1. Between two lightweight panels 2, the lightweight construction element 1 comprises a cavity, which can preferably be accessed on the top via at least one access opening and which is substantially closed at least laterally and on the bottom. The wood chips 19 are supplied through a pipe 21 and the binding agent 20 through at least one line 22 comprising a nozzle-shaped outlet opening. The outlet openings of the pipe 21 and of the at least one line 22 are assigned to one another in such a manner that a binding agent can be applied to all of the outflowing wood chips as evenly as possible. In the illustrated embodiment, the wood chips and the binding agent are in each case oppositely charged electrically, so that an application or mixing, respectively, which is as complete as possible, is ensured thereby.

[0116] FIG. 13 shows a step of a method, where wood chips 19 and binder 20 are joined to form insulating material mats. In the illustrated embodiment, two partial layers 23 are combined to form an overall layer 24. It goes without saying that the overall layer can be constructed of any number of partial layers 23, wherein an application device 25 is used for each partial layer 23. Each application device 25 applies wood chips 19 onto a carrier belt 26 in a layered manner. A binding agent is applied to the wood chips 19, supplied via pipes 21, where the binding agent is applied via nozzle-shaped outlet openings by lines 22. Upper partial layers 23 are placed onto the respective partial layer located therebelow. The created overall layer 24 is guided through a hardening path between the lowermost carrier belt 26 and a pressing belt 27, wherein the pressing belt 27 presses the wood chips, which are provided with the binding agent, against the carrier belt 26. To separate sections of the overall layer 24 of insulating material, either a separating device is used, or the carrier belt 26 and/or the pressing belt 27 has separating elements. In the illustrated embodiment, the wood chips and the binding agent are oppositely charged electrically in order to cause the application or impacting, respectively, to ensure a mixing, which is quick and as complete as possible.

[0117] FIGS. 14, 15 and 16 show wood chips, which were manufactured by means of circular saw blades having a different diameter, wherein the diameter of the circular saw blade was 160 mm in the case of the chips of FIG. 14, 140 mm in the case of FIG. 15, and 120 mm in the case of FIG. 16. The longest chips of FIG. 14 have a length of just under 30 mm, in FIG. 15 just under 22 mm and in FIG. 16 just under 15 mm. It can be seen clearly that the maximum of the distribution of the chip lengths of FIG. 14 via FIG. 15 to FIG. 16 shifts gradually to smaller chip lengths. If all of the grooves of a board are manufactured with circular saw blades of different sizes, a chip mixture results from all of the grooves together, the chip length distribution of which is wider than in the case of the manufacture of chips by means of circular saw blades, which are all the same. A chip mixture comprising chip lengths, which are distributed across a desired length range, can ensure a more complex cavity structure, than chips, which all have substantially the same length.

[0118] FIG. 17 shows a section of a mat-shaped insulating material, which comprises wood chips, which were manufactured by means of circular saw blades comprising different diameters. A complex cavity structure, from which moisture can escape quickly, is formed in the insulating material. If the insulating material according to the invention is used in lightweight construction elements of houses, constantly moist areas do not form and biological decomposition processes can thus substantially be minimized.

[0119] In addition to the walls according to FIGS. 1, 2 and 2a, which are constructed with lightweight construction elements including insulating material, walls can also be constructed with lightweight panels 2. Walls with insulating material are specifically suitable to be used as outside walls. Interior building walls, which do not require an insulating material layer, can be built with lightweight panels 2. FIG. 18 shows an interior wall, which comprises lightweight panels 2, which are connected to one another, wherein the lightweight panels 2 preferably comprise at least three layers 5. Grooves 9 are formed on both sides in at least one middle layer 5, and are only formed on the side, which faces the at least one middle layer 5, in the two outer layers 5.

[0120] At both of the lightweight panels 2, which are to be connected, the illustrated connecting device 34 comprises frame parts 3, which engage with second groove tongue arrangements 5a of the lightweight panels 2 by means of the first groove tongue arrangements 3a, wherein these engaging groove tongue arrangements 3a, 5a are glued to one another. So that the lightweight panels 5 can also be connected to one another easily at a construction site, the frame parts 3 have the connecting grooves 3b. Connecting strips 35 comprising groove tongue arrangements 35a make it possible to fixedly connect the frame parts 3 of the lightweight panels 2, which face one another, by using adhesives and/or connecting elements. If necessary, a cavity, which can be used for guiding of wirings, is created between the connecting strips 35 inserted from both sides.

[0121] It goes without saying that such interior walls can be covered or coated on one side or also on both sides. If necessary, a covering is held at a desired distance to the lightweight panels by spacers, so that a cavity, which can be used for installation purposes or for accommodating sound insulating material, for example, results between the lightweight panels and the covering.