RU160211U1 - WOODEN TWO-WAY GLUED BEAM - Google Patents

Abstract

A wooden I-beam glued beam containing shelves and a wall, characterized in that the rectangular wall is made of solid wood, the shelves are formed by connecting the side surfaces of three elements, two of which are in the form of a truncated pyramid with segmented bases, the third, located between them, of rectangular section , all the elements of the beam are obtained when cutting one log taking into account a given run and have a variable cross-section along the length.

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 fixing the beams to the wall. 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 create a beam with high bearing capacity, consisting of a minimum number of wall elements and shelves with rational cutting of logs.

The technical result of the proposed utility model is to reduce the complexity in its manufacture, as well as reduce the amount of waste when cutting one log and getting a double-tee glued beam from it with a bearing capacity exceeding the bearing capacity of the original log.

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

In FIG. 1 shows a cutting log for the manufacture of the claimed wooden I-beam glued beams: 1 - rectangular truncated elements, 2 - elements in the form of truncated pyramids with segmented bases.

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

In FIG. 3 shows a gable beam made up of two proposed wooden I-beams in length.

The beam is made as follows. First, a log is cut according to the scheme (see Fig. 1), taking into account a given run, which can vary from 0 and above. For the manufacture of one wooden glued I-beam, one log is needed. As a result of cutting, only two types of elements are obtained: rectangular truncated elements and elements in the form of truncated pyramids with segmented bases. The resulting elements have a constant (with a zero run) or variable (with a run greater than 0) length section.

Shelves are made by connecting the side surfaces of two elements of segmented section, between which there is an element of rectangular section. The wall is made of solid wood of rectangular cross section.

The proposed model differs from the prototype in that the wall elements are made of solid wood and are connected to the shelves by their edges, and not by 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 the differences listed above, this design of a wooden glued I-beam has an advantage: it is made of one log of the desired diameter, which can significantly reduce the consumption of raw materials and will reduce the cost of the finished structure.

To increase the span covered by the beam, it is possible to splicen along the length of the two proposed beams of variable section with their butt ends to obtain a composite gable beam (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 the rectangular wall is made of solid wood, the shelves are formed by connecting the side surfaces of three elements, two of which are in the form of a truncated pyramid with segmented bases, the third, located between them, of rectangular section , all the elements of the beam are obtained when cutting one log taking into account the given run and have a variable section along the length.

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