RU90821U1 - PERFORATED BEAM WITH KEYBOARDS - Google Patents

Abstract

A perforated beam with corrugated trapezoidal inserts contains two belts obtained by dissolving in a zigzag line along the wall of a continuous I-beam, and corrugated inserts of various heights welded to the edges of the belts, characterized in that the corrugated inserts are made in the form of a trapezoid.

Description

The utility model relates to building metal structures, and more specifically to perforated beams used as structures for coatings and floors of buildings and structures, cantilever overhangs, as well as used for suspension of technological devices and capable of performing other functions (for example, beams of combined systems, bridge crossings and etc.).

Known metal structures of perforated beams made of:

- split rolling profiles (I-beams, etc.) by dissolving along the wall of the initial profile along a zigzag line with subsequent butt welding of protrusions of the formed parts [Kopytov MM Perforated rods and methods for their study. Tomsk - 2002 (p. 4, fig. 1.1.c)]. In this case, from a continuous rolling element, a structure is obtained containing a system of regular holes - perforation. The disadvantage of this design is the relatively small degree of development of the section, which is limited by the height of the wall of the original profile. This leads to a limitation of the bearing capacity.

- split rolling profiles (I-beams, etc.) by dissolving along the wall of the initial profile along a zigzag line with subsequent welding between the protrusions of the formed parts of the rectangular inserts [Kopytov MM Perforated rods and methods for their study. Tomsk - 2002 (p.5, fig. 1.2.c)]. However, by increasing the height of the cross section, the flexibility of the wall increases, and the wall can lose stability. Corrugated inserts are used to increase local wall stability.

Closest to the claimed perforated beam is a perforated beam with corrugated inserts [Kopytov MM, Yashin SG Perforated beam with corrugated inserts / Certificate. on climbed. Model No. 16167 IPC ⁷ Е04С 3/08 No.200011860 / 20; Claim 05/11/2000; 12/10/2000. Bull. No. 34]: between the protrusions of the 2 belts obtained by dissolving along the wall of the rolling I-beam in a zigzag line, additional rectangular inserts with bent edges that are welded to these protrusions are installed. The disadvantage of a beam with a constant section height is that the material is distributed along the length of the beam without taking into account changes in internal forces (bending moment).

The objective of the utility model is to more rationally distribute the material along the length of the beam in accordance with the distribution of internal forces (bending moment).

The problem is solved as follows. In a known perforated beam containing two belts obtained by preliminary longitudinal dissolution of the I-beam wall in a zigzag line, welded to each other through corrugated inserts placed between the protrusions of the zigzag line, the inserts are made in the form of a trapezoid. Thus, the claimed device differs from the prototype in that the corrugated inserts are made in the form of a trapezoid, as a result of which the beam has a section height that is variable in length. Thanks to the proposed device of corrugated inserts in the form of a trapezoid, the beam acquires a section height that is variable in length, the material along the length of the beam is distributed more rationally, in accordance with the distribution of internal forces (bending moment), which leads to steel savings.

In figure 1. shows a general view of a fragment of a perforated beam with corrugated trapezoidal inserts with a slope of one (upper) belt, with inserts of a [-shaped profile with lateral orientation of the edges bent to one side; figure 2. - a general view of a fragment of a perforated beam with corrugated trapezoidal inserts with a slope of 2 belts, with z-shaped inserts with lateral orientation of the edges bent to different sides; figure 3. - section 1-1 of figure 1; figure 4. - section 2-2 of figure 2; figure 5 shows an isosceles trapezoidal insert with edges bent to one side; figure 6 - shows a trapezoidal insert with edges bent in different directions.

The perforated beam with trapezoidal corrugated inserts contains two belts 1, 2 of an I-beam cut along the wall along the zigzag line (Figs. 1, 2) and corrugated inserts 3, obtained from a steel strip by bending the edges forming a [-shaped or z-shaped section profile (FIGS. 5-6). Corrugated inserts 3 are installed between the protrusions of the belts 1, 2 and are welded to them with fillet or butt welds. The implementation of such a beam is possible with the use of channel profiles, bent sheets, welded continuous composite I-beams as initial profiles.

The manufacture of perforated beams with trapezoidal corrugated inserts is as follows. Known methods (stamping; gas, plasma or laser cutting) perform dissolution along the wall of the original I-beams (or other profiles). As a result, the elements of belts 1, 2 are formed. At the same time, the required number of trapezoidal plates of specified sizes is cut by guillotine cutting (or in another way). By stamping, flexible on presses or in another way, bending of the parallel edges of the trapezoidal plates is performed to obtain a [-shaped or z-shaped (figure 5, 6) corrugated profile of the inserts. The inserts are installed between the protrusions of the belts and welded to them.

The trapezoidal shape of the corrugated inserts allows the beam to acquire a variable cross-sectional height along the length of the material, to distribute the material along the length of the beam more rationally, in accordance with the distribution of internal forces, which leads to steel savings.

Claims (1)

A perforated beam with corrugated trapezoidal inserts contains two belts obtained by dissolving in a zigzag line along the wall of a continuous I-beam, and corrugated inserts of various heights welded to the edges of the belts, characterized in that the corrugated inserts are made in the form of a trapezoid.