RU168168U1 - WOODEN TWO-WAY GLUED BEAM - Google Patents

Abstract

The proposed utility model relates to the field of construction, namely, to the designs of beams used as load-bearing elements of floors or coatings of buildings for various purposes, as well as floors, elements of wooden roofs, such as rafters, girders, racks, struts, frame elements for industrial and civil buildings. The technical task is to reduce the cost and consumption of raw materials in the manufacture of wooden I-beam glued beams while increasing the bearing capacity of the structure. tatom claimed utility model rational use as raw material wood of the log in a single I-beam, as well as connection elements on the circuit configuration simple, providing an increase in bearing capacity of the beam.

Description

The proposed utility model relates to the field of construction, namely, to the designs of beams used as load-bearing elements of floors or coatings of buildings for various purposes, as well as elements of wooden roofs, such as rafters, girders, racks, struts, frame elements for industrial and civil buildings.

In a number of works, in particular, in the utility model patent No. 66762, a wooden I-beam glued beam was proposed, containing two shelves and a wall connecting them. [Utility Model Patent No. 66762 Laminated Wooden Beam / Latypov A.R. Date of publication: September 27, 2007. The beginning of the patent: 12/21/2005]. For the manufacture of beam shelves, it is proposed to use spruce wood planks without knots, selected and glued together, followed by a groove along the entire length of two parallel grooves for further wall fixing. The wall is made in the form of two sheets of standard birch plywood glued together, which have a full length spike, also intended for fastening with beam shelves. Bonding sheets of plywood into the wall, assembling boards into shelves and filling the grooves is done with glue based on formaldehyde resin. All other exposed surfaces of the beam are protected from external influences by a phenolic film coating.

Despite a number of advantages, this model of a wooden glued I-beam has disadvantages. Firstly, the plywood sheets of which the beam wall is made have limited overall dimensions, which leads to the appearance of additional operations: preliminary cutting and joining of plywood sheets along the length. Secondly, in the beams of this design, to ensure the stability of the wall, additional elements are introduced - stiffeners, which are installed along the entire length of the beam with a certain step. Thirdly, for the manufacture of such a beam, different materials are used that have different indicators of water absorption and linear expansion coefficients.

A known design of a wooden glued I-beam with a wall and shelves of glued wood [S.N. Rykunin, L.N. Candelina. Woodworking technology. M.: Publishing Center "Academy". 2011.352 s]. The wall and shelves of the beam are obtained by gluing coniferous wood elements over the face. This method is adopted as a prototype. The disadvantage of the prototype is that such a wall does not perceive tangential stresses that may occur as a result of the construction. Also, among the disadvantages, a large consumption of glue can be distinguished, which is necessary for bonding along the face of the elements, as well as for gluing along the length of the blanks without knots.

The technical task is to reduce the cost and consumption of raw materials in the manufacture of wooden I-beam glued beams while increasing the bearing capacity of the structure.

The technical result of the claimed utility model is the rational use as a raw material of wood of one log in one I-beam, as well as the combination of elements of a simple configuration according to the scheme, providing an increase in the bearing capacity of the beam.

A utility model is illustrated in FIG. 1-3.

In FIG. 1 shows a cutting log for the manufacture of the proposed wooden I-beam glued beams: 1 - rectangular truncated elements, 2 - trapezoidal truncated elements, 3 - pyramid-shaped elements, at the base of which are rectangular triangles.

In FIG. 2 shows a wooden I-beam, glued from elements 1, 2, 3 after cutting one log.

In FIG. Figure 3 shows a variant of a gable beam composed in length of two proposed wooden I-beams.

The essence of the claimed utility model is as follows.

First you need to properly cut the log. For the manufacture of one wooden glued I-beam, one log is needed. The log is cut according to the scheme (see Fig. 1), taking into account the given run. The escape can be set from 0 and above. At zero run, cutting of logs is carried out. All elements obtained after cutting have a variable cross-section along the length and constant - when cutting round logs. Both shelves and the wall consist of three elements each (see Fig. 2). The middle element in the shelves and wall is composite and is formed by connecting the lateral surfaces of the trapezoidal part and two pyramid-shaped parts of a truncated shape. As the outer layers, two rectangular truncated elements are used. The cross-sectional dimensions of the shelves and walls are the same.

The proposed model differs from the prototype in that the wall elements are located along the longitudinal axis of the structure and mate with the shelves with their edges rather than the plates. Such conjugation makes it possible to better perceive tangential stresses on the wall, since shear forces are directed along the fibers, and the glue line is practically switched off from shear work and works only on separation. All this leads to an increase in the bearing capacity of the structure.

In addition to these differences, this design of a wooden glued I-beam has an advantage: it is made of one log, which can significantly reduce the consumption of raw materials and leads to a reduction in the cost of the finished structure.

As a result of splicing along the length of the two proposed beams of variable cross section with their butt ends, a composite gable beam is obtained (see Fig. 3), in which the material is rationally distributed to absorb external bending loads.

Claims (1)

A wooden I-beam glued beam containing shelves and a wall, characterized in that both shelves and a wall consist of three elements each, while the middle element in the shelves and wall is composite and is formed by connecting the lateral surfaces of the trapezoidal part and two truncated pyramid-shaped parts, all beam elements are obtained when cutting one log taking into account a given run, have a variable cross-section along the length.

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