BE1018822A5 - BUILDING ELEMENTS AND ROOF CONSTRUCTION. - Google Patents

Abstract

Construction element, more especially for roof, wall or floor constructions, wherein this construction element (1) is at least composed of a base plate (2) and a top plate (3) between which insulating material (4) is located, and wherein said plates (2-3 ) are provided with one or more ribs (5), characterized in that said base plate (2) and top plate (3) are acoustically decoupled. The invention also relates to a roof construction (9) in which such building elements (1) are attached to the roof truss (10) in such a way that at least the above-mentioned top plate (2) is acoustically decoupled from the roof truss (10).

Description

Building elements and roof construction.

This invention relates to building elements or building panels, as well as to a roof construction that makes use of such building elements.

The known building elements or building panels mainly exist in two types. On the one hand there is the so-called open-scaled building element, in which a base plate is applied on only one flat side of the building element or building panel and wherein the other flat side, namely the open side, is mainly formed by the insulating material itself and, on the other hand, the closed or sandwich building element in which a top plate is arranged on the second flat side, so that the insulation material is located in the space between the base plate and the cover plate. For examples of open-scaled roof elements and closed, or sandwich roof elements, reference is made to EP 0 978 801 and EP 1 162 050.

SUMMARY OF THE INVENTION The present invention has a tile rail or a closed-type building panel that can be used as roof elements, wall elements, or floor elements. The betr: the type idaft: minsfêiis isJ è ^ i ^^ gésiêlâ ^ üif'ëërt ^ bâsis ^ iyâîPën1 a biÿ ^ pia ^^ artii & sèrÎ iëolatlématëriaéi bé ^ inët; and with Voofhöernde plëtén are "provided with one or more ribs.

The very good authenticity of the pan-panes are well known and can be acknowledged as "one thing" and the same is true.

Such roofing elements cannot be applied to their base plate on a simply constructed roof hood, for example a roof hood with only purlins. After the ihsfäliätie vanH animal-like "dakéiérnëht"; dëzë is usually still equipped with pänneniatteh dîè: on: or other roofing material support: lil ëand dëgggualë c »nstfüMë fulfills the function of a traditionally admitted öhdëdëdëdëdëdëdëfd that the base plate is provided with such inner lining. Such roof elements are customarily prefabricated for a home.

The building elements of the above-mentioned type which are known from the prior art exhibit an excellent heat-insulating effect, but are less suitable for acoustic insulation.

From CH 601 598 and DE 34 37 446, insulation elements of a type other than the above are known. Only one plate is used for this. Moreover, in this case only one single reinforcement rib is attached to this base plate. Such insulation elements have a limited bearing capacity. In both documents the height of the reinforcement rib is kept smaller or equal to the thickness of the insulating material and said base plate is directed outwards. In DE 34 37 446, the aforementioned reinforcement rib for obtaining better acoustic insulation is composed of two layers, namely a first layer made of an insulating material with limited capacity. hard foam, for example, and a second layer consisting of a rriatrial ridge and high compressive strength. The insulation elements were connected to the roof truss by long nails, which are driven by the support plate and the reinforcement ribs. This method of attachment partially abolishes the acoustic insulation of the two-layer reinforcement ribs, since the above-mentioned base plate is now connected to the roof truss through the rigid nails.

DE 41 01 234 discloses an insulating element of a different type than the one mentioned above, in which only one plate is used and there is made use of reinforcing ribs, but "" Vah! "" More generous * "" = "b'e ^ disiligliattian embedded in the insulation material. To this end, the latter extend in the transverse direction of the insulating element. Such an insulating element has a limited bearing capacity. When the building element is used, the base plate is fixedly connected to the roof truss, for example by screws or nails.

From BE 1017639 an insulating element is known for another of the above-mentioned type, wherein only one plate is used and no use is made of reinforcement ribs. The relevant plate is fully glued to the insulation material on one side. Such an element is not self-supporting, but cooperates with separately provided ribs.

From CH 670 673 and CH 644 921, insulation elements of a different type than those mentioned above are also known, in which only one plate is used, and in which the reinforcing ribs present are not attached to the base plate, but make contact with a web-shaped sealing foil or completely embedded in the insulating material. In the case of CH 644 921, the inward-facing side of the roof element is formed by the insulating material, or optionally by a sealing foil applied to the insulating material, while in the case of the CH 670 673 the inward-facing side is formed through the base plate.

A sound-insulating roof construction is known from BE 1016469 in which band-shaped insulating material is arranged between supports, which per se are composed of a slat and a rule arranged thereon. The so-called acoustic rule is composed of a material that absorbs vibrations such as coconut material. The roof construction is provided with plates that are fixed to the slats and rails by means of screws or nails and further finished with a layer of cover plates. Such a construction is very cumbersome.

With a view to obtaining improved acoustic insulation, mainly with building elements or building panels of the aforementioned type, according to various independent aspects thereof, the present invention relates to novel building elements which, due to their individual or combined inventive features, contribute to an increased sound resistance, or in other words to improved acoustic insulation and / or to an increased solidity of the element. According to various preferred embodiments, the invention offers a solution for one or more disadvantages with the components of the prior art.

According to a first independent aspect, the invention relates to a building element, more especially for roof, wall or floor constructions, wherein this building element is at least composed of a base plate and an upper plate, between which there is insulating material, and wherein said plates are provided with one or more ribs, characterized in that said base plate and top plate are acoustically disconnected. Because the aforementioned plates are acoustically disconnected, sound waves that pound on one of the two plates, for example on the plate that is directed outwards in the roof construction, propagate to a lesser extent to the other plate, for example to the plate that enters into the roof construction is focused. Such acoustic decoupling can be realized in many ways. For example, it can be ensured that the two plates are only connected to each other via compressible material. Both plates can also be elastically connected to each other in another way, for example through the intervention of one or more torsion springs or leaf springs. By "compressible material" is meant material that is more compressible than the material of the aforementioned ribs. According to a practical example, such acoustic decoupling of both plates can be achieved by the following second independent aspect. According to a second independent aspect, the invention relates to a building element, more specifically for roof, wall or floor constructions, wherein this building element is at least composed of a base plate and a top plate, between which there is insulating material, and wherein the above plates are provided with one or more ribs, with the characteristic that the base plate or other insulating material is connected to the top plate. The pressure stiffness of the building element at a pressure load is determined on one of the plates is essentially determined by the pressure stiffness of the insulation material. The base plate is preferably connected to the top plate exclusively over the insulating material. Hereby it is achieved that a pressure load perpendicular to one of the aforementioned plates is transmitted mainly or purely via the insulating material to the other of the aforementioned plates, and therefore not, or in principle not via the aforementioned ribs. The aforementioned ribs can, however, be used as a wine. bptredeh in the case of a "possible bending load or torsional load, and thus contribute to this stiffness to the stiffness of the element. The ribs, for example, limit a possible sag of the element and can determine the maximum achievable span of such a building element. r:

It is clear that a building element can, according to the 'independent aspect of the invention, possibly also exhibit the characteristics of the first independent aspect;

According to a third independent aspect, the invention relates to a building element, more specifically for cover, wall or floor constructions. in which this building element is at least composed of a base plate and a top plate, between which there is insulating material, and wherein said plates are provided with one or more ribs, characterized in that the possible distance between said rib and the base plate differs from the possible distance between said above rib and the top plate. The aforementioned distance is then seen in cross-section of the building element and measured perpendicular to one of the aforementioned plates. It is clear that according to this third aspect, the aforementioned possible distance may possibly be non-existent, or may be virtually non-existent. Due to the arrangement of the third aspect, an acoustic decoupling, such as in the first and / or the second aspect, can be combined with good bending stiffness. Because the material of the ribs is closer to one of the plates, a greater inertia block is obtained when bending.

It goes without saying that the building element of the third aspect can also display the characteristics of the first and / or the second aspect.

The exemplary embodiments which follow hereafter relate in each case to building elements which have the characteristics of the first and / or the second and / or the third aspect of the invention.

The building element of the invention is preferably elongated and, preferably, the aforementioned ribs extend in the longitudinal direction of the building element. Two or more of such ribs are preferably used, wherein these ribs are, preferably, located internally in the building element and thus do not form a side edge thereof, although this is not excluded. The insulating material is preferably located at least for a part thereof between the aforementioned two or more ribs. Such ribs preferably consist of wooden beams, preferably with a rectangular cross-section. Naturally, it is not excluded that a material other than wood is used, and / or that a different cross-section is opted for for these ribs, such as for a cross-section similar to the cross-section of an I-profile. Preferably, a lateral distance of at least 30 centimeters is kept between the ribs and more preferably of at least 40 centimeters.

According to a preferred embodiment, said rib, or said two or more ribs, is attached to said base plate or top plate without intermediate insulating material. The ribs in question can, for example, be attached by means of nail, screw and / or glue connections and / or via any other fixing means. The direct fixing of the ribs on at least one of the plates, namely without intermediate insulating material, ensures that the ribs can absorb the applied forces in a good manner under a bending load. Moreover, according to this preferred embodiment, a simple construction of the building element is achieved. As is apparent from the foregoing, the ribs in question are, according to the invention, preferably only directly connected to one of the aforementioned plates. Preferably, the ribs in question are not even connected to the other plate at all, if it is possible that they are for instance connected laterally to the insulating material, for instance by means of an adhesive attachment, wherein the insulating material can in turn then be directly or indirectly connected back to the other plate. plate. Such a lateral connection of the ribs to the insulating material, however, has hardly any influence on the acoustic properties of the building element or on the compressive strength or stiffness of the building element. This lateral connection of the ribs with the insulating material can, however, have a positive influence on the stiffness of the building element in the case of bending and / or torsion.

Preferably, at least one of the plates, for example the top plate, is separated from said rib by an air chamber. Optionally, instead of air, it is also possible to use another material that is more compressible than the aforementioned insulating material, such as a gel or a liquid which is, for example, in a closed, deformable container.

Preferably at least the base plate and / or at least the top plate consist essentially of wood-based plate material, such as a multiplex plate, OSB plate (Oriented Strand Board), a wood chip plate, a wood fiber plate such as MDF or HDF (Medium Density Fiberboard or High Density Fiberboard). . Other plate materials are also possible, such as flax chipboard, gypsum cardboard plate, cement fiber plate, gypsum fiber plate or silicate plate. The material used for the base plate and / or the top plate can have the property that it is water-resistant and / or fire-retardant, as can be the case with wood chip plates. The top plate and the base plate preferably have a thickness of at least 6 millimeters, and more preferably of at least 8 millimeters. The top plate can optionally be made thicker than the base plate.

The cellulosic insulating material used is a cellulose-based insulating material or an insulating material based on wood fiber. Cellulose-based insulation materials are known for their good acoustic insulation value, moreover they also show an acceptable to very good thermal insulation value. The cellulose-based insulating material can be applied to the building element either dry, as a self-contained layer or as a viscous liquid substance, after which it is cured or dried out. Insulation materials based on wood fiber also exhibit good acoustic insulation values in combination with an acceptable to very good thermal insulation value. Preferably, so-called wood fiber insulation boards are used. The wood fibers can be connected to each other for example with the aid of a polyolefin. It is also possible that this insulation material is provided with fire-retardant additives, such as one or more inorganic nitrogen-containing mineral acids. For example, the hOutFlex insulation boards put on the market by HOMÄTHERM® are highly suitable for use in the components of the present invention according to all its aspects.

Naturally, instead of cellulose or wood fiber, it is also possible to work with other insulating materials, such as foam-based foam, which, for example, contains foam flakes connected with polyurethane, these foam flakes being obtained, for example, as waste in the production of mattresses or mattress set.

Optionally, it is also possible to work with the typical thermally insulating materials, such as with an insulating foam selected from the series of polyurethane, polyisocyanurate, polystyrene, extruded polystyrene, expanded polystyrene phenol insulation, perlite, vermieulite and glass foam, or with an insulating material selected from the mineral series. wool, such as glass wool or rock wool, wood wool, flax wool, sheep wool and plumes, such as duck plume or the like. In the case of glass wool, a significant fire-retardant effect is achieved, and in the case of an insulation material of animal origin, a very environmentally-friendly building element is obtained.

According to a preferred embodiment, the building element of the invention has an acoustic resistance (Ra) of at least 40 dB (a) and / or at least a thermal resistance (Rc) of 4 m2K / W. Such insulating values can be achieved with an insulating material based on cellulose, wherein this insulating material itself has a thickness between 10 and 20 centimeters.

Preferably, at least one of the aforementioned plates, preferably the plate facing outwards in the roof construction, is of a heavier design than the other of said plates. The heavier execution of this plate leads to better acoustic resistance. For example, as an outward facing plate a plate with a thickness of 12 millimeters or more can be used, such as a plate of 18 millimeters or more, while the other plate is made thinner. As already mentioned, it is possible that, inter alia, the inward-facing plate on the relevant side is finished with decorative material, for example with a laminate layer, scraps or the like.

According to a fourth independent aspect, the present invention also relates to a building element that can lead to good sound insulation. To this end the invention relates to a building element, more particularly for roof, wall or floor constructions, wherein this building element is elongated, contains at least one base plate and is provided with two or more ribs extending in the longitudinal direction of the aforementioned base plate, and wherein between said ribs are insulating material, wherein, seen in a cross section of the building element, there is a difference between the height of at least one of the ribs and the thickness of the insulating material, characterized in that the height of said rib is smaller than the thickness of the insulating material and that the possible distance between said base plate and said rib is less than half the aforementioned difference. The aforementioned distance is then seen in cross-section of the building element and measured perpendicular to the aforementioned plate. It is clear that, according to this fourth aspect, the aforementioned possible distance may be non-existent, or virtually non-existent. Preferably, said optional distance is less than 40%, or even better, less than 30% of the aforementioned difference. It is also clear that the building element of the fourth aspect may possibly also exhibit the characteristics of the first and / or the second and / or the third aspect and / or the preferred embodiments of these aspects, but this is not necessarily the case. Indeed, according to the fourth independent aspect, it is possible that only one plate is used, and that, in other words, no top plate is available. As will become apparent from the detailed description, it is also possible with such a building element to realize an acoustically decoupled roof construction. By limiting the possible distance between the ribs and the base plate, it can be achieved that said ribs are arranged asymmetrically with respect to the neutral fiber under bending load. This results in an increased moment of inertia when bending.

According to a fifth aspect, the invention further contemplates a roof construction that provides better sound insulation. To this end the invention relates to a roof construction, wherein this roof construction comprises one or more building elements of the type comprising at least one plate, ribs and insulating material located between these ribs, said building elements being directly or indirectly attached to the roof structure, characterized in that the building elements are fixed to the roof truss in such a way that at least said plate is acoustically disconnected from the roof truss. It is clear that the building elements of previous aspects can be used here. For preferred embodiments of such a roof structure, reference is made to the detailed description.

The building elements according to all aspects of the invention are preferably self-supporting. By this is meant that such building elements can form a self-supporting structure, or in other words in such a structure are able to bear their own weight without significant distortion. This property can lead to very simple constructions.

With the insight to better demonstrate the features of the invention, a few preferred embodiments are described below as an example without any limiting character, with reference to the accompanying drawings, in which: figure 1 represents a building element with the features of the invention in perspective ; figure 2 represents a cross-section on a larger scale according to the line III-II indicated in figure 1; figures 3 to 7 show variants in a similar view; figure 8 represents a roof construction with the features of the invention in perspective; figure 9 represents a cross-section on a larger scale according to the line IX-IX indicated in figure 8; figures 10 and 11 represent on a larger scale a view according to the areas F10 and F11 indicated in figure 9, wherein figure 11 represents a variant; figure 12 represents a variant in a view similar to that of figure 9; and figure 13 shows on a larger scale a view of the area F13 indicated in figure 12.

Figure 1 shows a building element 1, more particularly a roof element or roof panel, with the features of the first to the fourth aspect of the present invention.

The roof element 1 of figure 1 is composed of a base plate 2 and an upper plate 3 between which there is insulating material 4. The aforementioned plates 2-3, in this case only the base plate 2, are provided with ribs 5. In the example, three ribs 5 are used which extend in the longitudinal direction of the elongated building element 1. With regard to the insulating material 4, use can for instance be made of cellulose-based material. Optionally, the insulating material 4 can per se be composed of several layers of the same material or not. Such a multi-layered composition of the insulating material 4 is not shown here.

The top plate 3, which is intended to be directed outwards in a roof construction, is provided with counter slats 6 attached thereto, which also extend in the longitudinal direction of the element 1. The counter slats 6 may, for example, be glued to the top plate 3, as is the case here, or fixed to it with nails or screws. A combination of the aforementioned fixing techniques is of course also possible. Such counter battens 6 can be provided in all embodiments of the present invention and this is not the case in the production of the component 1. They do not necessarily have to be arranged, as is the case in the example, at positions corresponding to the aforementioned ribs 5. In roof constructions where the longitudinal direction of the building elements 1 is parallel to the width of the roof construction, it is of course possible for the counter slats 6 to extend transversely to the longitudinal direction of the element 1. In such a case, the counter slats are preferably fixed to the element only if it is already included in the roof construction.

The building element 1 of Figure 1 has various special features. A first special feature consists in that the top plate 3 is acoustically decoupled from the base plate 2. This property has, in this case, been obtained because the top plate 3 only makes contact with the insulating material 4. The top plate 3 is thus elastically connected to the base plate 2. Herewith it is achieved that sound waves which reach the top plate 3 and penetrate into the building element 1 must propagate mainly, if not exclusively, via the insulating material 4. Because an acoustic insulating material 4 is used, such as with wood-fiber insulating plate, a high absorption of the sound waves in the building element 1 can be obtained, such that any residual sound that the base plate 2 radiates may be limited.

Figure 2 clearly shows a second particular knowledge of the structural element 1, namely that the base plates are connected to the top plate 3 over the insulating material 4, and that, in other words, the ribs 5 do not connect these plates 2 * 3 directly, as is the case with the sandwich elements from the prior art, for example with the elements of EP 0 450 731, EP 1 253 257 and EP 1 162 050. Preferably, the aforementioned top plate is 3, as is the case here is connected to the aforementioned insulation material 4 on the basis of an adhesive connection 7. Preferably, the bottom plate 2 is also connected to this insulation material 4 at least with an adhesive connection 7. In the example, the aforementioned glue connection 7 to the insulating material 4 is not made over the entire surface of the plates 2-3, but is interrupted at the level of the ribs 5. However, the large surface area of the plates 2-3 with self-supporting elements 1 leads to a sufficient strength of the glue connection 7 with the insulating material 4 to absorb, for example, any wind loads.

It is clear that the compressive strength or pressure stiffness of the element 1 shown, when loaded perpendicularly to one of the plates 2-3, is mainly determined by the compressive strength or compressive stiffness of the insulating material 4, and thus not or substantially not by the compressive strength or compressive stiffness of the ribs used 5. In the example shown, an elastic connection between the plates 2-3 is obtained.

. Figure 2 also shows that the ribs 5 are connected via glue connections 7 to the base plate 2 and, preferably also to the insulating material 4 situated between them. However, these glue connections 7 have little or no influence on the aforementioned pressure stiffness or pressure strength of the element 1, but they do have a positive influence on the resistance to any bending and / or torsional loads.

Figure 2 shows a third special feature, namely that the possible distance x1 between the ribs 5 and the base plate 2, which here is non-existent or virtually non-existent, differs, and in the example is smaller than the distance x2 between these ribs 5 and the top plate 3. In the example of Figure 2, the ribs 5 are connected to the base plate 2 via an adhesive connection 7, while no connection, but an air chamber 8 is present between these ribs 5 and the top plate 3. This property leads to improved acoustic insulation in combination with good bending stiffness.

It is clear from the above that the building element 1 of figures 1 and 2 also has a fourth special feature, namely that there is a difference between the height H of the ribs 5 and the thickness D of the insulating material 4, the height H of the ribs 5 is smaller than the thickness D of the insulating material 4 and wherein the possible distance x1 between said base plate 2 and the ribs 5 is smaller than half of the aforementioned difference. In this case, this possible distance x1 is non-existent or virtually non-existent, because the ribs 5 are directly attached to the base plate 2 by means of an adhesive connection 7. With regard to the height H of the ribs 5, it is further noted that they do not necessarily all have to be of the same height, but preferably all have such a height that acoustic decoupling between top plate 3 and base plate 2 remains possible.

It is noted that a building element or roof element 1, such as that of figure 1, can in practice have a length L which can be several times the width B thereof. The length L can be provided to measure to the roof construction and is preferably between 2 and 8 meters, while the width B of the element 1 depends on the number of ribs 5 that the roof element 1 has, with a width B

between 60 and 150 centimeters is preferred. The total height A of a roof element 1 can here preferably be chosen between 7 and 25 centimeters. The total thickness D of the insulating material 4 then corresponds to this.

The aforementioned base plate 2 and / or top plate 3 can for instance be selected from the series of wood chipboard, gypsum cardboard plate, gypsum fiber plate, multiplex plate, OSB plate (Oriented Strand Board) and silicate plate.

The aforementioned ribs 5 or squares preferably consist of wood such as pine or pine and preferably cover the entire length L of the roof element 1. Preferably, each rib 5 consists in length in one piece and preferably has a thickness of 20 to 45 millimeters . Instead of being made in one piece, one or more of the aforementioned ribs 5 can also be assembled in their spring direction from several parts, for example by attaching shorter ribs to each other. Such confirmation can be carried out with a finger joint. For an example of such a technique, reference is made to the aforementioned EP 1 162 050. It is noted that the base plate 2 and / or the top plate 3 can also consist of sections welded together.

It is expected that on the basis of a building element 1, such as that of figure 1, in which one such acoustically decoupled top plate 3 is provided, an acoustic resistance value of Ra = 44 dB (a) can be achieved, while a thermal resistance of Rc = 4 m 2 K / W is achieved, while experiments with a virtually identical, but not decoupled, dense coexistence state of the art, namely wherein the ribs connect the base plate and the boveripiate, show only an acoustic resistance value of Ra = 35dB (a). The acoustic decoupling of the invention thus provides a very significant improvement of the sound-insulating properties of building elements 1.

Figure 3 shows a variant in which both ribs 5 are attached to the base plate 2 and to the top plate 3. Hereby it is achieved that the connection between the top plate 3 and the insulating material 4 is even better resistant to wind loads. improved bending and / or torsional rigidity. It is clear that this element 1 also has the special characteristics mentioned above.

Figure 4 shows yet a further variant in which the configuration of the ribs 5 is such that the base plate 2 and the top plate 3 exhibit comparable, if not identical, mechanical properties. In the example, it therefore concerns a completely symmetrically constructed building element 1, wherein ribs 5 are arranged on both the base plate 2 and the top plate 3. In the present case, the ribs of the base plate 2 are separated from the ribs 5 of the top plate by an air chamber 8, which provides for the aforementioned acoustic decoupling. It is clear that good results can also be achieved with other materials which are located at the location of the air chamber 8 shown here. Preferably, a material is used that exhibits a lower compressive strength or compressive stiffness than the aforementioned ribs 5. Thus, for example, the insulating material 4 can be used. It is clear that the building element of Figure 4 has the characteristics of the first to the fourth aspect of the present invention.

Figure 5 shows yet another variant in which the ribs 5 are not directly attached to the base plates or the top plate 3, but are located in the mass of the insulating material 4. Such an element just as well has all of the special features mentioned above, but leads to a slightly less flexural stiffness compared to the elements 1 of figures 1 to 3.

It is noted that in the building elements i of the invention, it is not necessarily necessary to work exclusively with glue joints 7 for connecting the plates 2-3 and / or ribs 5 to the insulating material 4. One or more joints may have been established by the insulation material 4 itself. This can be the case, for example, when polyurethane is used which is foamed during production of the component 1 on one of the plates 2-3, between the two plates 2-3 and / or between the ribs 5. The connection obtained between foamed polyurethane and chipboard has proved to be stronger during testing than a separate adhesive connection between chipboard and, for example, gas fiber wool. One or more connections can be made with mechanical connecting means, such as by means of barbs that engage in the insulating material. It is clear that all these connection techniques can be combined with each other.

Figure 6 shows another variant in which a heavy top plate 3 is used, wherein this top plate 3 is preferably made heavier than the aforementioned base plate 2. Thus, for example, an OSB plate with a thickness of 18 mm or more could be used. For the rest, the element 1 is of identical design as the building element 1 shown in figures 1 and 2 and thus has the same special characteristics as the element 1 from those figures. On the basis of such an element 1, an acoustic resistance value of Ra = 50 dB (a) can be achieved.

Figure 7 shows a variant which, among other things, shows the features of the fourth aspect of the invention. This concerns, in this case, an element 1 which is practically identical to the element 1 of figures 1 and 2, but which is not provided with a top plate 3. It will be apparent from the further detailed description that such element 1 is also a roof construction with a good sound-insulating effect. Such an element 1 is of particular interest for the renovation of existing roof constructions, wherein these roof constructions already comprise, for example, a sheet formwork which is arranged on the roof truss, for example on the outside thereof.

Figure 8 shows how the roof element 1 of figure 1 can be used in a roof construction 9. A relatively simple roof cap 10 can be assumed here, as shown, wherein a limited number of purlins 11 is used, on which the roof elements 1 are then attached . As shown, the further roof covering 12 can then be applied to these roof elements 1. For example, as shown here, roof tiles can be installed after tile slats 13 have first been provided. Hereby, the tile slats 13, in the example, were attached to the counter slats 6 or battens. Although in the example the building elements 1 extend with their longitudinal direction from the gutter to the ridge, it is possible to position the building elements 1, according to a variant of such a roof construction 9, such that they extend with their longitudinal direction in the width of the roof construction. 9 extend. This is transverse to the orientation of these elements shown here 1. It is clear that with such a transverse orientation the orientation of the other parts of the roof construction, such as the batten battens, the battens and the purlins, is preferably carried out unchanged as shown in figure 8.

Figure 9 clearly shows the structure of the roof construction 9 from Figure 8. As is apparent from the larger representation of Figure 10, it is possible to attach the building elements 1 to the roof hood 10 without the acoustic disconnection of the top plate 3 and the base plate 2 being canceled. To this end, it is possible, for example, to use U-shaped clamps 14 which are driven into the ribs 5 with one end and beaten through the base plate 2 into the roof hood 10 or purlins 11 with another end. Because the rib 5 would be accessible, a hole 15 in the top plate 3 is provided locally in the case of Figure 10. This can, for example, be realized on the basis of a hole saw. Such holes 15 may or may not already have been provided in the production of these building elements 1. It is clear that through this way of working a roof construction 9 can be obtained with the characteristics of the fifth aspect of the invention. Instead of such hook-shaped clamps 14, it is also possible to work with two threaded screws or nails, one of which engages in the rib 5 while the other penetrates into the roof cap 10 or purlin 11. The connection between the screws or nails can, for example, be realized in such a case by driving the affected screws or nails through a common connecting element, which is preferably located above the above-mentioned rib. · "· ·

Figure 9 shows that any disadvantages 16 between the roof elements 1 can be further finished both along and transversely, for example by filling them with an insulating material 17, such as polyurethane foam. Such a finish also retains the acoustic decoupling between top plate 3 and base plate 2.

Figure 11 shows a variant in which mechanical coupling means 18 are provided on the sides of the roof elements 1. In the example, the edges are profiled, for example milled, in such a way that they allow a tooth 19 in groove 20 to be realized between two adjacent building elements 1. Here too, the remaining seam 16 is further finished with an insulating material 17, such as polyurethane foam.

Figure 12 shows how the building elements 1 of Figure 6 can be used to obtain a roof construction 9 with a good sound-insulating effect. The roof construction 9 comprises a separately arranged plate-shaped covering 21 which is attached to the roof hood 10 or the purlins 11. This can be the case, for example, with the renovation of an existing roof construction. The building elements 1 from figure 6 are fixed to this by directing them outwards with their base plate 2.

Figure 13 shows that also in the case of the building elements 1 of Figure 6 it is possible to prevent an acoustic coupling between the base plate 2 and the separate plate-shaped covering 21 and thus a roof construction 9 with the features of the fifth aspect of the present invention. to achieve. In the example of Figure 13 this is realized in that the nails or screws 22 used are connected to the base plate 2 via a compressible material 23. For this purpose, for example, a material 23 can be used whose compressibility is closer to that of the insulating material 4 than to that of the ribs 5.

In general it is further noted that the aforementioned ribs 5, in the production of such building element 1, do not necessarily have to be applied to the relevant plate 2-3 before the insulating material 4 is added to building element 1. After all, it is possible to provide recesses in or between the insulating material 4 in which the ribs 5 can subsequently be attached. For example, a technique similar to that known from EP 0 978 601 can be applied.

It is further noted that where there is a base plate 2 and / or an upper plate 3, these are preferably, but not necessarily, intended to be directed inwards or outwards in the roof construction 9.

Furthermore, it is clear that the building elements 1 of the invention can comprise any number of ribs 5, and that this number can vary from one to five or more, said ribs 5 preferably all extending in the longitudinal direction of the building element 1. The ribs 5 preferably have a rectangular cross-section, with one of the smallest sides of this cross-section being fastened to said plates 2 or 3, as is the case in all examples shown here. This makes it clear that the ribs 5 in the building elements 1 of the invention cannot be compared with tile slats 13, battens 6, fixing slats or the like. Moreover, they preferably have a larger cross-section than such slats, tile slats 13 or battens 6. In contrast to slats, tile slats 13 or battens 6, the ribs 5 used in the building elements 1 of the invention preferably have at least the property that they are free or are substantially free from deformation due to bending when they have a length of more than 5 meters and bear their own weight. The ribs 5 used according to the invention preferably have at least a cross-section that is larger than 10 square centimeters, and even better is larger than 20 square centimeters. It is known that slats, tile slats 13 and battens 6 generally have a diameter that is smaller than 8 square centimeters. The ribs 5 preferably, viewed in cross-section, have a height H which is at least half the total thickness A of the building element 1. However, this is not necessary. For example, in the case of a building element similar to the building element of Figure 4, this can also be less than half of that total thickness A. Preferably, also in such a case, the ribs 5 have a height H which is at least a fourth, and better still amounts to at least one third of the total thickness A of the building element 1.

It goes without saying that the decoupled fixing techniques that can also be applied, mutatis mutandis, with reference to Figures 9 to 13 for obtaining wall or floor constructions with excellent sound-insulating properties. It is clear that the present invention according to a variant of the aforementioned fifth aspect also comprises such wall or floor constructions.

The present invention is by no means limited to the embodiments described above, but such building elements and roof constructions can be realized according to different variants without departing from the scope of the present invention. For example, it is possible to use the invention instead of the flat building elements shown in the figures, to use so-called arched building elements. These are characterized in that the aforementioned base plate and / or top plate are curved according to an arc with a radius of, for example, 2 to 10 meters, and this preferably around an axis parallel to the longitudinal direction of the building element. These building elements are suitable, for example, as an acoustic roof element in a roof construction that has a certain curvature. Such roof elements preferably extend with their longitudinal direction in the width of the roof construction.

Claims (11)

A building element for a roof construction, wherein this building element (1) is at least composed of a base plate (2) and a top plate (3) for mounting counter battens (6), wherein between said base plate (2) and said top plate ( 3) insulating material (4), and wherein said plates (2-3) are provided with one or more ribs (5), characterized in that said base plate (2) and top plate (3) are acoustically disconnected, the base plate (2) ) is connected to the top plate (3) over the insulating material (4) and that the possible distance (X1) between said rib (5) and the base plate (2) differs from the possible distance (X2) between said rib (5) and the top plate (3). Building element according to claim 1, characterized in that the building element (1) is elongated and the aforementioned ribs (5) extend in the longitudinal direction of the building element (1). Building element according to claim 1 or 2, characterized in that the aforementioned rib (5) is mounted on the base plate (2) without any intermediate insulating material (4). Building element according to one of the preceding claims, characterized in that the top plate (3) is separated from said rib (5) by an air chamber (8). Building element according to one of the preceding claims, characterized in that at least the base plate (2) and / or at least the top plate (3) consist of wood-based plate material. Building element according to one of the preceding claims, characterized in that the aforementioned insulating material (4) is a cellulose-based insulating material or an insulating material based on wood fibers. Building component according to one of the preceding claims, characterized in that the above-mentioned top plate (3) is of a heavier design than the above-mentioned base plate (2). Building element according to one of the preceding claims, characterized in that this building element (1) has an acoustic resistance (Ra) of at least 40 dB (a) and / or at least a thermal resistance (Rc) of 4 m2K / W. A building element for a roof construction, wherein this building element (1) is elongated, contains at least one base plate (2) for mounting counter battens (6) and is provided with two or more ribs (5) extending in the longitudinal direction of the aforementioned base plate (2), and wherein insulating material (4) is present between said ribs (5), wherein, seen in a cross-section of the component (1), there is a difference between the height (H) of at least one of the ribs (5) and the thickness (D) of the insulating material (4), characterized in that the height (H) of said rib (5) is smaller than the thickness (D) of the insulating material (4) and that the possible distance ( X1) between said base plate (2) and said rib (5) is less than half the aforementioned difference. Building component according to claim 9, characterized in that said ribs (5) are connected to the insulating material (4) via glue connections (7). Roof construction, wherein said roof construction (9) comprises one or more building elements (1) with the features of the preceding claims, wherein said building elements (1) are directly or indirectly attached to the roof truss or to the roof cap (10), characterized in that the building elements (1) are mounted on the roof truss (10) in such a way that at least the above-mentioned plate (2-3) is acoustically decoupled from the roof truss (10).