Glued timber

FIELD: construction.

SUBSTANCE: invention deals with constriction structures elements. The timber contains plates, glued interlayer between plates and reinforcing meshes inserted into interlayer. The reinforcing meshes are arranged continuously along the whole length of timber. Their edges project from the glued interlayer by, at least, one timber edge.

EFFECT: improvement of timber operational service life and stability.

2 cl, 2 dwg

 

The proposed laminated wooden beam refers to the elements of building structures, and more precisely to the wooden bars, intended for use primarily as integral parts of building blocks with structural insulation, as well as beams and columns.

In this proposal, the terms "beam" and "beam" are used in the following interpretation:

A beam is a structural element, usually in the form of timber, working mainly on the curve.

The timber is sawn, hewn lumber or laminated package of lumber, the length of which is considerably superior to the other two dimensions.

The term "surface" means the broad, flat side of the Board, and the term "edge" means a narrow (thickness) direction of the Board.

In the technique of glued wooden beams, representing a plate (Board), glued together usually wide sides (surfaces), the main problem is that the heterogeneity of the properties of wood in different directions, uneven shrinkage, exacerbated by the spread of properties from plate to plate, generating the beams significant mechanical stress, leading to the breakdown of connections and the deformation of the bars. Known a number of technical solutions to this problem.

Known laminated wood element, which includes plates, the fibers of which Orien is iravani along the longitudinal axis of the element, interconnected by layers of adhesive layers. The outer plates are made of solid wood (larch, oak, ash), and the inside is soft (spruce, pine, fir) [RF Patent №2168594 on CL IS 3/14, Appl. 29.12.99]. A disadvantage of the known laminated element is the high cost due to the use of expensive hard-to-cut wood for exterior plates. As a consequence, the first disadvantage of such an element may not be produced in quantities that meet the needs of mass construction. In addition, hard rock is most sensitive to changes in humidity. Plate of them quickly deform and crack under cyclic humidity environment.

Closest to the proposed timber to the technical essence and the achieved result is a laminated wooden beam, designed for use as beams, including plates, between which is placed the adhesive layer, and in primarnych areas beams inside the adhesive layers placed a reinforcing strip of woven mesh having a variable length along girder [A.S. USSR №989009 on CL EV 5/12, Appl. 08.06.81]. The disadvantage of this beam is the lack of versatility, due to the fact that the reinforcing elements are placed in primarnych areas beams, the location of which is subject to change depending in some designs this beam is applied. In addition, the strengthening beams only in primarnych areas does not solve the above problem glued wooden beams and planks.

When using such products as elements of a building frame their lateral sides, at least one of them, often are in contact with structural insulation of the building. Due to the lack of adhesion between the insulation and the surface of the timber with time between them a gap arranged along the heat flow, and heat-insulating properties of the structure are reduced. If the building or its elements containing insulation, are carried, because of the shaking of sediment insulation and the formation of cracks occur very rapidly.

The technical result achieved by the present proposal is to improve the operational stability and durability of glued wooden beams, ensuring the stability of the insulating properties of building elements with structural insulation using the proposed parallel bars.

This technical result is achieved by the fact that in the known laminated wooden beams, including plate, the adhesive layer between the wafer and the reinforcing strip of mesh placed in the adhesive strips, the reinforcing strip is placed continuously along the length of the beam, and the x edges protrude from the adhesive layers, at least one of the edges of the beam.

In addition, these reinforcing strips protrude from the adhesive layers, at least 0.05 width of the beam.

The technical result from placement of the reinforcing strips are continuously along the length of the beam is greatly enhancing the shape of the beam, preventing delamination and other violations of adhesive joints, reducing the distortion of the beam due to shrinkage of the wood, i.e. increase, ultimately, operational stability and durability of the timber. In addition, reduced requirements for the quality of the wood, are permitted knots and other defects, eliminating the need for calibration wafers before bonding.

The technical result from implementation of the reinforcing strips with edges protruding from the adhesive interlayer, also is to improve the operational stability and durability of the timber, since this embodiment allows the use of fully carrying capacity of the cross-section of the beam, which prevents chipping and peeling corners and sides of the plates. This characteristic contributes to improving the shape of the beam.

Another technical result from implementation of the reinforcing strips with edges protruding from the adhesive layers, at least one of the edges of the beam, is to increase the stability of those is loisaida properties of construction elements of buildings with structural insulation, in cases where the proposed timber is in contact with structural insulation. Protruding edge of the reinforcing strip, caplease with the structural fibers of the insulation, prevent occurrence of a gap between him and the Board, thereby improving the quality of thermal insulation of the building.

The technical result from the fact that the edges of the reinforcing strips protrude from the adhesive layers, at least 0.05 width of the beam, is that this ensures the formation of the adhesive inflow along the edges of the plates, which prevents chipping and peeling corners and sides of the plates, and when the beam bending allows you to use the full carrying capacity of the cross-section of the beam.

The essence of the proposal is illustrated by drawings.

Figure 1 shows a cross-section of the proposed timber.

Figure 2 shows in enlarged view the output of reinforcing mesh of the adhesive joint of adjacent plates.

Proposed glued laminated hardwood timber (figure 1) consists of glued to the package wooden plates (boards) 1, the fibers of which are oriented along the longitudinal axis of the beam. Between the plates 1 are adhesive layer 2. Within each of the adhesive layers 2 posted by reinforcing mesh 3. The width of the grids 3 somewhat exceeds the width of the plates And so that the edges of the grids 3 protrude from the package inserts on the value Vmigo values of a and b is the value In ≥ 0,05A. Depending on the purpose of the grid plates can be of service to a higher level, not necessarily symmetrically on both edges. If only one edge of the beam is in contact with structural insulation, the grid must be more from Kant. The upper and lower (in the drawing) of the side (edge) of the beam can be processed to give the beam a predetermined height, the sides after gluing are not processed. Plate before gluing are not processed (calibrated) to give a precisely defined thickness and supplied to the bonding immediately after the sawmill after drying to moisture transport.

The maximum value can be in the range of about 50...250 mm depending on the destination of the timber.

When gluing timber grid 3 is tightly clamped between the plates 1. Thanks to the forces of surface tension and the protrusion of the grid 3 of the joints of the plates 1 of the extruding when pressing glue package 4 (figure 2) is delayed by the grid and wets the outside of the corners and edges of the plates, strengthening them. Additionally, it increases the strength of beams in bending, ensuring that collected in the package insert will work as one unit on all section of the package.

To reduce wrinkling, it is preferable that the plates are assembled in a package with alternating directions of the issue is lost original logs, as shown in figure 1.

Due to the fact that the bonding surfaces are not planed, villi and burrs remaining after cutting logs, additionally reinforce the glue joint. The reinforcing action of the grid and lint allow local increase in the thickness of the adhesive layer without reducing the strength properties of timber. This allows you to avoid calibrating processing of surfaces on thicknesser machine that significantly reduce the manufacturing cost. It also reduces the demands on the quality of the material of the plates, and the proposed timber has the same strength characteristics as conventional glulam, but when grade material for one or two units below. Thanks to these advantages, the proposed beam is obtained in the manufacture of not more expensive laminated veneer lumber without nets, but better quality.

If timber is used as pillars or elements of a skeleton construction panels and the sides (edges) are in contact with insulation, so that the grid 3 meshed well with structural insulation, sufficient condition 0,1A≤≤0,25A. In the manufacture of building blocks shorter bars are often in smaller increments. Accordingly, the lower is the shrinkage of the insulation and the less in absolute terms the amount required to produce the grid. In any case the, the value must not be less than 10 mm For a beam width of 40 mm, this corresponds to a ratio of V=0,25A. The larger the plate, the value is closer to 0,1A.

If timber is used as beams or struts protruding into the room and covered with plaster, edges, at least one of the grids 3 should be enough to be enough to wrap to be plastering the surface of the beam. This eliminates the necessity of special plaster mesh.

1. Laminated wooden beams, including plate, the adhesive layer between the wafer and the reinforcing strip of mesh placed in the adhesive strips, characterized in that the reinforcing strip is placed continuously along the length of the beam, and their edges protrude from the adhesive layers, at least one of the edges of the beam.

2. Laminated wooden beam according to claim 1, characterized in that the said reinforcing strips protrude from the adhesive layers on the both edges of the beam, at least 0.05 of its width.



 

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