RU143311U1 - COMPOSITE CONSTRUCTION BEAM (OPTIONS) - Google Patents

Abstract

1. Composite building beam, containing at least two lamellas located at a distance from each other and parallel to each other, made of wood, or material containing wood components, or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material, characterized in that it is equipped with a flat frame made in the form of a reinforced cellular structure of a power grate of wood fragments, or composites, or material containing wood components that are directly or Without a net or a web, they are glued to the lamellas with the formation of cavities between these fragments, at least some of which are filled with filler from cork, or plant or mineral material, or composites based on them, or mineral wool, or inserts from these materials. 2 . A beam according to claim 1, characterized in that the lamellas are made of at least two layers, one of which is made of wood or plywood. 3. A beam according to claim 1, characterized in that it is provided with at least one additional flat frame made in the form of a reinforced cellular structure of a power grating made of wood fragments, or material containing wood components with the formation of cavities between these fragments, at least some of which are filled with filler from cork, or plant or mineral material, or composites based on them, or mineral wool, or inserts from these materials, while this additional flat frame c is located between one of the lamellas and a flat frame connected to the other lamella, and glued to this frame and adjacent

Description

The utility model relates to the field of ground construction, and more specifically to glued wooden beams and can be used in the construction of houses in the manufacture of walls and ceilings for buildings of any climatic conditions. The utility model relates to composite structural elements made in the form of a bar with a rectangular cross section (with straight or rounded corners on one side) or in the form of a board with an oval side, which can be widely used in the manufacture of a large range of baths, country houses, residential and office modules, sports, exhibition and trade pavilions.

Currently, most of the structural elements in the form of timber used as a building material are made of wood.

For example, a rectangular or square solid bar is known to be obtained in the process of longitudinal sawing of round timber on standard industrial equipment, for example, a conventional sawmill, and used in the construction of walls, partitions, frame structures for buildings and other objects (A.N. Pyasotsky “Sawmill ", M, 1970, p. 431). A significant drawback of such a product is the need to use relatively large diameter and length logs for its production, i.e. a forest with sufficient age, as well as a large consumption of source timber per unit of production.

It is known that forests in the process of industrial development are shrinking faster than being restored. In addition, the direct procurement of timber, in addition to the cost of reproduction of forests, is constantly becoming more expensive due to various and numerous factors. In this regard, a search is constantly underway for solutions that will significantly reduce the use of solid wood, as well as attempts are being made to replace natural wood with other structural materials.

Known wooden profiled bars (Construction and architecture. Express information, series: building structures and materials, VNIINTPI, 1997, issue 4, Moscow, p. 12-15). Such bars are made by gluing two three boards, however, such a beam has a significant drawback, namely, to obtain a beam of the correct geometric shape, that is, without curvature, longitudinal bending and torsion, it is necessary that the boards are glued before pressing and reach a certain humidity of the wood, and after gluing, it is necessary to withstand the glued beam under pressure to maintain its geometric shape. Such a process takes a lot of time and in reality is not maintained. In connection with this construction, workers are dealing with non-dried wood, which dries up after the assembly of the wall or ceiling. This leads to the fact that the beam occupies the unstressed state, which is allowed to it by adjacent bonds and dries out with warping or bending.

More progressive is the decision of the beam according to patent RU 85516, E04C 3/29, publ. 08/10/2009. This beam is made of two longitudinal and transverse lamellas (lamellas are timber blocks that are formed when it is scrapped, from which a profiled glued beam is subsequently produced) glued together to form a through longitudinal axial hole filled with effective insulation. The lamellas are glued together taking into account the direction of the annual layers of wood, which reduces the likelihood of splits and cracks. This is achieved by the fact that the longitudinal lamellas are made of sawn timber of tangential sawing, and the transverse ones are made of radial sawing, or vice versa. Despite the fact that such a beam allows you to reduce the consumption of wood, the process of manufacturing the beam itself is complicated and with increased loads (floors above 2 floors or when installing heavy equipment) in the places of gluing lamellas and insulation, delamination can occur, which will lead to destruction of the timber structure and loss structural strength.

Known composite structural element made in the form of a bar of rectangular cross section, having external lamellas and an inner layer made between fillers, made of filler, characterized in that the external contour of the composite structural element formed by external lamellas made of sheet material is closed, and the inner the layer is made of a lightweight, foamy filler, with at least one groove oriented along the length of the composite structural element d angles to the longitudinal axis of the composite structural member (RU 47286, B27M 3/00, B27M 3/18, 27.08.2005). This decision was made as a prototype for the declared objects.

The disadvantage of this solution is that such a beam does not have strength and cannot be considered as a bearing power building element. This is due to the fact that the outer layer is carrier in such a beam, in fact, the beam is hollow with a thin-walled shell, which cannot bear the load and is subject to the disadvantages inherent in thin-walled structures.

This useful model is aimed at achieving a technical result, which consists in reducing the weight of the timber while increasing its strength and heat-shielding properties.

The specified technical result is achieved by the fact that the composite building beam containing at least two lamellas located at a distance from each other and parallel to each other from wood or material containing wood components or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material is equipped with a flat frame made in the form of a reinforced cellular structure of wood fragments or material containing wood components that are directly or through a mesh for fiberglass or fiberglass cloth glued to the lamellas with the formation of cavities between these fragments, at least some of which are filled with cork or mineral wool filler or inserts of these materials.

The specified technical result is achieved by the fact that the composite building beam containing at least two lamellas located at a distance from each other and parallel to each other from wood or material containing wood components or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material is equipped with at least two flat frames, each of which is made in the form of a reinforced cellular structure of wood fragments or a mate containing wood components rial, both power frames are glued to each other directly or through a fiberglass mesh or fiberglass cloth, and fragments of these frames facing the lamellas are glued to these lamellas directly or through a fiberglass mesh or fiberglass cloth, with cavities are formed by fragments of power frames, at least part of which in each specified frame is filled with filler from cork or mineral wool or inserts of these materials.

The specified technical result is achieved by the fact that the composite building beam containing at least two lamellas located at a distance from each other and parallel to each other from wood or material containing wood components or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material is equipped with at least one flat frame made in the form of a reinforced cellular structure of wood fragments or material containing wood components that are not Directly or through a fiberglass mesh or fiberglass cloth are glued to the lamellas with the formation of cavities between these fragments, at least some of which are filled with cork or mineral wool filler or inserts of these materials, with at least one side of the bar between the lamellas made lowering or deepening in the region of the power frame, in which the sealing element protruding above the lamellas is placed.

The specified technical result is achieved by the fact that the composite building beam containing at least two lamellas located at a distance from each other and parallel to each other from wood or material containing wood components or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material is equipped with at least one flat frame made in the form of a reinforced cellular structure of wood fragments or material containing wood components that are not Directly or through a fiberglass mesh or fiberglass cloth are glued to the lamellas with the formation of cavities between these fragments, at least some of which are filled with cork or mineral wool filler or inserts of these materials, with at least one side of the bar between the lamellas made along the length of the beam lowering or deepening in the area of the power frame.

The specified technical result is achieved in that the composite building beam containing at least two lamellas located at a distance from each other and parallel to each other from wood-containing material or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material, is provided between lamellas and a frame attached to them made in the form of a cellular structure, which are directly or through a mesh or linen material glued to the lamellas, and the cavities in the cellular of the construction, the frame is filled with the indicated filler or inserts from this filler.

In the framework of this utility model, a purely technical problem is solved to create a lightweight structural load-bearing beam that maintains strength at a level no less than the strength of a solid wood beam, and at the same time has high heat and sound-protective properties and reduced weight with a small consumption of wood material.

These features are significant and are interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

This useful model is illustrated by specific examples of execution, which, however, are not the only possible ones, but clearly demonstrate the possibility of achieving the desired technical result.

In FIG. 1 is a first example of a beam;

FIG. 2 - the second example of the execution of the beam;

FIG. 3 - the third example of the execution of the beam;

FIG. 4 - the fourth example of the execution of the beam;

FIG. 5 is a fifth example of a bar;

FIG. 6 - the position of the bars when laying the wall;

FIG. 7 - the sixth example of the execution of the timber;

FIG. 8 is a fragment of the execution of a typeset lamella;

FIG. 9 is a seventh example of a beam.

According to this utility model, the construction of a composite construction beam is considered, which is a power supporting element for the construction of floor walls, poles, beams and other load-bearing building elements.

The term “composite” refers to the so-called composite material or composite - an artificially created inhomogeneous continuous material consisting of two or more components, different in physical and chemical properties, which remain separate at the macroscopic level in the finish structure. The mechanical behavior of the composite is determined by the ratio of the properties of the reinforcing elements and the matrix (only in the value of the binder in the composite material), as well as the strength of the bond between them. The effectiveness and efficiency of the material depend on the correct choice of the starting components and the technology of their combination, designed to provide a strong bond between the components while maintaining their original characteristics.

In the general case, within the framework of this utility model, a composite building beam is considered, containing at least two lamellas located at a distance from each other and parallel to each other from wood-containing material or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material. This bar is equipped with a frame placed between the lamellas and attached to them, made in the form of a cellular structure, which is directly or through a mesh or linen material glued to the lamellas, and the cavities in the cellular structure of the frame are filled with the indicated filler or inserts from this filler.

The timber (Fig. 1) contains at least two lamellas 1 located at a distance from each other and parallel to each other from wood or material containing wood components or from plywood. Between the lamellas there is a flat (flat construction) frame made in the form of a reinforced cellular structure made of wood fragments 2 or material containing wood components, which are directly or through a fiberglass mesh or fiberglass cloth glued to the lamellas 1 with the formation of cavities between these fragments. In this example of FIG. 1 fragments 2 are made in the form of bars or strips that are parallel (maybe not parallel) along an oblique (that is, at an angle to the direction of the beam along the length). In the General case, the fragments of a flat frame can be a plank, round cross section or bars or elements of any shape. All cavities between fragments or at least some of them are filled with filler 3 from a cork or plant or mineral material or composites based on them or with mineral wool or inserts 4 of these materials (filler with a specific gravity less than the specific gravity of the material of the lamellas and fragments of the power frame) .

The lamels of the beam can be made with a rectangular cross-section (with straight or rounded corners on one side) or in the form of a board with an oval side (Fig. 7). The shape of the lamella on the outer surface is selected from the profile of the beam itself, which must be obtained. A variant of execution of lamellas with two or more layers of individual elements in the lamellas arranged in height is possible. This allows you to form a decorative structure of the surface of the timber (fragment shown in Fig. 8).

The beam may contain two pairs of lamellas 1 and 5, in each pair of lamellas are located at a distance from each other and parallel to each other and are made of wood or material containing wood components or plywood, while the lamellas 1 of one pair are perpendicular to the lamellas 5 of the other pair with the formation in cross section of a rectangular profile. From the outer surface, the lamellas can be coated with a finishing material: veneer of valuable wood, film, fabric, leather, paper, foil, primer, paint or varnish.

As glue or adhesive, adhesives are used, which are usually used in the production of glued beams, furniture panels, parquet boards. Due to the variety of such products, this type of adhesive or adhesive is not specified in the framework of this application. As a mesh, or a cloth or plates made of fiberglass, or a hydrocarbon filament or other polymeric metal-containing fiber (we are talking about a mesh or linen material, for example, building mesh or cloth, which is used for plastering walls, corners and ceilings), having the flexibility to interact with glue or a binder, it is practically not affected by aggressive environments and does not have elasticity, then after the glue dries or the adhesive polymerizes, the entire layered structure monolizes. A feature of the use of a flexible mesh or flexible non-woven fabric made of fiberglass is that during the polymerization of glue or adhesive, the mesh is laid on a layer of fragments and eliminates the differences and irregularities of the honeycomb structure.

The use of a mesh or non-woven cloth made of fiberglass allows for air permeability of the beam, and the use of cork or mineral wool allows to increase noise and sound insulation. Cork material is in demand in various fields of modern industry. And, of course, cork materials are used for decorative finishing, thermal insulation and sound insulation of residential and office premises. Cork is a natural antistatic agent: it is not electrified, does not collect dust, and is not allergenic. In addition, the cork is not susceptible to decay, the effects of bugs, is immune to mold, does not emit harmful substances and does not support combustion. Thanks to tannin and the lack of protein, it does not rot and does not change with prolonged contact with water. The special properties of a product are determined by its structure. The structure of the cork is similar to honeycombs of millions of water-tight multilayer cells filled with a gaseous mixture of nitrogen and oxygen, which allows cork products (floors, wallpaper, coatings) to restore their original shape after pressure on it and provides excellent heat and sound insulation characteristics. The cell that the cork consists of (approximately 40 million in each cc) consists of a minimum amount of solid and a maximum amount of air. Another feature is the composition of the cell walls. Each wall consists of 5 layers: two layers of fiber, which adhere to the air in the cell, two thick and greasy layers that are impervious to water and a final woody layer, which gives the cell rigidity and final structure. Noise and sound insulation is ensured by the fact that sound waves penetrating the internal structure of the panel fall into a large number of chambers or cavities and are crushed and damped. There is no resonance effect in such a panel.

The power frame can be made of any structural complexity. For example, in FIG. 2 presents a power frame made in the form of separate frames 6 made of strips. These frames can be made in height dimensions corresponding to the dimensions of the beam in its height. The location of the frames may also be different. In the FIG. 3 an example of a frame 6 are located distantly relative to each other. The cavities of the 7 frames and the sections between them are filled with inserts 4 of cork and other plant components and composites with their inclusion of either mineral wool or foaming polymer. These liners are glued to the areas between the frames, and within the framework they can simply be inserted without adhesive bonding. Frames 6 can be located close to each other or be made smaller, which will allow them to be displaced, staggered or in accordance with a different predetermined algorithm for the location of individual fragments of the power flat frame.

The essence of the claimed utility model is not in the concrete design of the flat power frame itself, but in the fact that there is such a power frame between the lamellas. A power frame is understood to mean any structure in terms of execution and in the form of elements used in wood or material containing wood components, the elements of which are glued to the lamellas and are located with the formation of cavities between the fragments. The frame itself is a set of partitions or jumpers through which the lamellas are interconnected.

These examples are typical and show how it is possible, while maintaining the strength of the timber, to reduce its weight and improve heat and sound insulation performance. The lamellas 1 can be made of wood in the form of a board (Fig. 1 and 2) or plywood, or of at least two layers 8 and 9 (Fig. 3), one of which 8 is made of wood or plywood. Such lamellas as a separate part have increased flexibility, especially in the transverse direction in the plane of the board. But two boards, which are interconnected by power elements having a directivity different from the directivity of the boards, acquire increased rigidity and strength. In the example of FIG. 1 shows that the power frame is made in the form of strips or bars located at an angle to the longitudinal direction of the boards (lamellas). In this case, the fragments, directly or through a grid (cloth) of fiberglass, are glued to the lamellas. Thus, two boards acquire rigidity in the transverse direction, since the bending load in the transverse direction is transmitted to the inclined slats and is distributed on them over a large area of the lamellas (the alignment of forces occurs). If you draw a section in the transverse direction through the strips or bars, then you can see that more than one strip or bar falls into the section. This structural example shows that any loading that provokes the deformation of the lamellas leads to the fact that several bars or bars perceive this load at once, the combination of which, when spaced apart in space, leads to increased bending resistance. Similarly, the beam resists torsion and deflection.

The mechanical properties, that is, the bearing capacity of a panel of composite material, can be multiplied by an almost small increase in weight due to an increase in the number of layers of the honeycomb structure (Fig. 3). To form two layers in the frame structure, the beam is provided with at least one additional flat frame 10 made in the form of a reinforced cellular structure of wood fragments or material containing wood components with the formation of cavities between these fragments. All or at least part of these cavities is filled with filler from cork or mineral wool or inserts of these materials. This additional flat frame is located between one of the lamellas and a flat frame connected to the other lamella, and glued to this frame and the adjacent lamella directly or through a fiberglass mesh or fiberglass cloth. The number of frame layers can increase from two to three and further, while maintaining the described principle of connecting elements in a beam.

So. in FIG. Figure 3 shows a composite building beam containing at least two lamellas 1 located at a distance from each other and parallel to each other, made of wood or material containing wood components or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material. The beam is equipped with edge with at least two flat frames, each of which is made in the form of a reinforced cellular structure of wood fragments or material containing wood components, both power frames glued to each other directly or through a fiberglass mesh 11 or a fiberglass cloth, plate or composite material and fragments of these frames facing the lamellas, glued to these lamellas directly or through a fiberglass mesh or fiberglass, with which between the power fragments cavities are formed in the frameworks, at least a part of which in each indicated framework is filled with filler from cork or mineral wool or inserts of these materials.

In FIG. 3 presents one of the possible examples of the implementation of a two-layer power frame. Each layer of the frame in this example is made in the form of unidirectionally arranged strips connected by jumpers to form cells, which all or part of them can be filled with filling filler or filler in the form of finished inserts from cork or mineral wool or other insulating or sound-absorbing material. One power frame is laid out with respect to another so that the fragments in one power frame are located vertically and / or horizontally offset relative to the fragments in the adjacent power frame. Or the power frames would be located with an angular displacement, for example, when gluing one power frame is rotated 45 ° relative to the other power frame. Practice shows that in production, in order to reduce time and simplify the assembly process, it is advisable to use the power frame of the same design for each layer. In this regard, the proposals for the displacement of one frame relative to another are valid only for the case when all frames are made of the same design.

In FIG. 4 and 5 show examples of the execution of the beam, in which the power frame is made in the form of a centrally located element 12, for example, from a board OR GLUED SHIELD, to which checkers 13 of the bar are glued in some order. These bars are also glued to the lamellas. In FIG. 4 and 5 show examples when the height of the centrally located element 12 is less than the width of the lamella, and FIGS. 7 and 9 show examples in which the height of the centrally located element 12 is equal to the width of the lamella, that is, the side of the beam and thereby forms the middle power element, connected with lamellas through inserts.

The above examples show that the load-bearing capacity of the beam is determined by the fact that the structure of the power frame as an inner layer has its own strength characteristics different from the strength characteristics of the lamellas. But when glued, a sandwich type model is formed in cross section, in which a new strength quality is formed in which each layer is a support for the neighboring one. And the forces arising in one layer are redistributed in the adjacent one, which levels the load, distributing it throughout the timber structure. In this regard, the ability of the beam to resist external loads sharply increases.

In addition, such a bar after polymerization of the adhesive or adhesive and while holding the bar in the press clamp at the time of polymerization (with such a hold, the beam geometry is laid) retains its geometry even in conditions of changing humidity and temperature.

In FIG. 4 and 5 show two examples of the execution of a bar for masonry. When laying one beam on another between the boards, a gap local to the length of the beam remains, which is then sealed with sealing means, for example, tow, jute, coconut copra. To solve this problem, it is proposed to lower or deepen in the region of the power frame (along the length of the beam) on at least one side of the beam between the lamellas, and in this recess or lower the sealing element protruding above the lamellas is placed 14. When the beam is planted on a previously laid beam there is a collapse of the sealing elements at the contact point of the lamellas of the bars, which leads to sealing of the joint (Fig. 6). In FIG. 5 shows an example when the seal is made in the form of a rectangular cross-section of the tape. Such a seal can be made only on one side of the beam, but it is possible to place the seal on both sides of the beam, as shown in FIG. 6. And in FIG. 4 shows a seal that is located in a recess and has peripheral portions located on the surfaces of the lamellas. The seal can simply be inserted into the recess along the length of the beam, but can also be glued on one side to prevent loss from falling.

At the same time, the presence of a seal as a structural element of the timber is optional. The seal may not be present in the beam, in which, on at least one side of the beam between the lamellas, a lowering or deepening is made in the region of the power frame (along the length of the beam). The beam can be produced with an already existing recess from the calculation that, when installing the wall, a sealing means will be laid in this recess, the choice of which in the modern construction market is unlimited.

The proposed construction of the building power beam allows you to get beams of any thickness and structure with low weight, while the design is sufficiently rigid to be used as load-bearing building units. In addition, the proposed device allows you to reliably protect the interior from temperature fluctuations and external noise, and thereby increase heat and sound insulation.

It will be apparent to those skilled in the art that various modifications and changes are possible in the present utility model. Accordingly, it is assumed that the present utility model covers these modifications and changes, as well as their equivalents, without departing from the essence and scope of the utility model disclosed in the attached utility model formula.

Claims (13)

1. Composite building beam, containing at least two lamellas located at a distance from each other and parallel to each other, made of wood, or material containing wood components, or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material, characterized in that it is equipped with a flat frame made in the form of a reinforced cellular structure of a power grate of wood fragments, or composites, or material containing wood components that are directly or es mesh or cloth adhered to the lamellas to form cavities between said fragments, at least some of which are filled with cork filler, vegetable or mineral material or composites based on them, or mineral wool, or inserts made of these materials. 2. A beam according to claim 1, characterized in that the lamellas are made of at least two layers, one of which is made of wood or plywood. 3. A beam according to claim 1, characterized in that it is provided with at least one additional flat frame made in the form of a reinforced cellular structure of a power grating made of wood fragments, or material containing wood components with the formation of cavities between these fragments, at least at least, some of which are filled with filler from cork, or plant or mineral material, or composites based on them, or mineral wool, or inserts from these materials, while this additional flat car Al located between one of the slats, and flat-frame related to the other lamella and glued to the frame and the adjacent slats directly, or through a mesh or fabric. 4. A beam according to claim 1, characterized in that it contains two pairs of lamellas, in each pair of lamellas are located at a distance from each other and parallel to each other and are made of wood, or material containing wood components, or of plywood, while the lamellas one pair is located perpendicular to the lamellas of the other pair with the formation in the section of a rectangular-shaped profile. 5. A beam according to claim 1, characterized in that the fragments of a flat frame are planks, round cross sections, bars. 6. Composite building beam, containing at least two lamellas located at a distance from each other and parallel to each other, made of wood, or material containing plant or wood components, or plywood, between which there is a filler with a specific gravity less than the specific gravity of the material lamellas, characterized in that it is equipped with at least two flat frames, each of which is made in the form of a reinforced cellular structure of a power grid from fragments of wood or containing wood components enty of the material, while both power frames are glued to each other directly, either through a mesh or canvas, and fragments of these frames facing the lamellae are glued to these lamellas directly, or through a mesh, or canvas, and between fragments of the power frames are formed cavity, at least part of which in each specified frame is filled with filler from cork, or plant or mineral material, or composites based on them, or mineral wool, or inserts of these materials. 7. A beam according to claim 6, characterized in that the lamellas are made of at least two layers, one of which is made of wood or plywood. 8. A beam according to claim 6, characterized in that the fragments of the flat frame are planks, or round round cross-section, or bars. 9. A beam according to claim 6, characterized in that it contains two pairs of lamellas, in each pair of lamellas are located at a distance from each other and parallel to each other and are made of wood, or material containing wood components, or of plywood, while the lamellas one pair is located perpendicular to the lamellas of the other pair with the formation in the section of a rectangular-shaped profile. 10. A beam according to claim 6, characterized in that the fragments in one power frame are located vertically and / or horizontally offset relative to the fragments in the adjacent power frame. 11. Composite construction beam, containing at least two lamellas located at a distance from each other and parallel to each other, made of wood, or material containing plant or wood components, or plywood, between which there is a filler with a specific gravity less than the specific gravity of the material lamellas, characterized in that it is provided with at least one flat frame made in the form of a reinforced cellular structure of a power grate made of wood fragments, or material containing wood components, which are directly or through a mesh or cloth glued to the lamellas with the formation of cavities between these fragments, at least some of which are filled with filler from cork, or plant or mineral material, or composites based on them, or mineral wool, or inserts from these materials, with at least one side of the bar between the la firs formed lowering or recess in the frame power, in which is placed over the protruding lamellae sealing member. 12. A composite building beam containing at least two lamellas located at a distance from each other and parallel to each other made of wood, or material containing wood components, or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material, characterized in that it is provided with at least one flat frame made in the form of a reinforced cellular structure of the power grid of wood fragments, or material containing wood components, which are directly either through a net or a web are glued to the lamellas with the formation of cavities between these fragments, at least some of which are filled with filler from cork, or plant or mineral material, or composites based on them, or mineral wool, or inserts from these materials, however, at least on one side of the beam between the lamellas, a decrease or deepening in the region of the power frame is performed along the length of the beam. 13. A composite building beam, containing at least two lamellas located at a distance from each other and parallel to each other from wood-containing material or plywood, between which there is a filler with a specific gravity less than the specific weight of the lamella material, characterized in that it is provided placed between the lamellas and the frame attached to them, made in the form of a cellular structure of the power grid, which are directly, either through a mesh or linen material, glued to the lamellas, and the cavities in the cellular structure uktsii frame filled with said filler or inserts of this filler.