RU2413820C1 - Flange joint of stretched elements of closed section - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: flange joint of stretched elements of closed section includes ends of rods with flanges, coupling bolts and sheet liner between flanges. Flanges are installed at the angle of 30° relative to longitudinal axes of rod elements. Sheet liner is made by pairwise support tables. Tables are rigidly fixed to flanges and are set against each other in assembled joint.

EFFECT: reduced weight of structural material.

7 dwg

Description

The present invention relates to the field of construction, namely to flange connections of stretched elements of a closed profile, and can be used in the mounting joints of the lattice belts.

A butt joint of tensile elements of a closed profile is known, including the ends of the rod elements with flanges, additional ribs and coupling bolts installed around the perimeter of the closed profile in pairs symmetrically relative to the ribs (Metal structures. 3 vol. T.1. General. (Designer Guide) / Under the general editorship of V.V. Kuznetsov. - M.: Publishing House of the DIA, 1998. - P.188, Fig. 3.10, b).

The disadvantage of the connection is the large dimensions of the flange and a significant number of connecting parts, which increases the consumption of material and the complexity of the design.

Closest to the present invention is the mounting butt connection of the lower (extended) truss belt from bent welded closed profiles, including the ends of the rod elements with flanges, additional ribs, coupling bolts and a sheet gasket between the flanges for attaching the truss lattice rods and links between trusses (1. Metal Designs: Textbook for universities / Edited by Yu.I. Kudishin. - M .: Publishing Center "Academy", 2007. - P.295, Fig. 9.27; 2. Metal structures. In 3 vols. T.1. Elements of constructions: Textbook for high schools / Ed. V. .Goreva -. M .: Higher School, 2001. - S.462, ris.7.28 in).

The disadvantage of the connection, as in the previous case, is the material consumption and the complexity of the mounting joint on the flanges.

The main task, the flange connection of stretched elements of a closed profile is aimed at, is to reduce the mass (consumption) of the structural material.

The result is achieved in that in the flange connection of stretched elements of a closed profile, including the ends of the rods with flanges, coupling bolts and a sheet gasket between the flanges, the flanges are installed at an angle of 30 ° relative to the longitudinal axes of the rod elements, and the sheet gasket is made up of paired support tables rigidly fastened to flanges and in the assembled joint are mutually abutted against each other.

The proposed flange connection has a fairly universal technical solution. So, it can be used in the assembly joints of lattice structures from pipes of round, oval, elliptical, rectangular, square, pentagonal and other closed sections. As another example of the use of the proposed connection, you can give similar joints on the installation of structural elements from paired and single corners, channels, I-beams, brands, Z-, H-,

U-, V-, Λ-, X-, C-, U-shaped and other open profiles.

The invention is illustrated by graphic materials, where figure 1 shows the proposed flange connection of stretched elements of a closed profile, top view; figure 2 is the same side view; figure 3 - the proposed connection for the case of attachment of the lattice element, side view; figure 4 - flange connection of the stretched elements of the open profile, top view; figure 5 is the same side view; figure 6 is the same, in the complete absence of the coupling bolts in the outer zones of the open profile; 7 is a design diagram of a stretched element of a closed profile with a flange and a supporting table.

The proposed flange connection of the stretched elements of the closed profile 1 comprises solid sheet flanges 2 attached by means of welds, mounted at an angle of 30 ° relative to the longitudinal axes of the stretched elements. The supporting tables 3 are rigidly fastened to the flanges 2 by means of welds. In the protruding parts 4 of the flanges 2 and the supporting tables 3, coaxial holes 5 are placed, in which, after assembling the connection, the mounting bolts 6 are installed.

To attach the core element of the grating 7 in the proposed flange connection, the supporting tables 3 are extended beyond the protruding parts 4 of the flanges 2 so that additional bolts 8 can be placed in them, as is done in a typical mounting joint on the flanges.

In the case of using the proposed flange connection for stretched elements of the open profile 9, the coaxial holes 5 in the flanges 2 and the supporting tables 3, as well as the coupling bolts 6 can be located not only outside the section (transverse or oblique) open (open) profile, but also in its inner zones. With the complete absence of tie bolts 6 in the external (external) zones of the open profile 9, the proposed flange connection is more compact.

In farms of rectangular and square pipes (bent welded closed sections - GSP), the angle of contact of the braces to the belt should be at least 30 ° to ensure the density of the weld seam from the acute angle (Metal structures: Textbook for universities / Ed. Yu.I. Kudishina. - M.: Publishing Center "Academy", 2007. - P.296). Therefore, in the proposed flange connection of the stretched elements of the closed profile 1, the flanges 2 and the supporting tables 3 attached to them are installed at an angle of 30 ° relative to the longitudinal axes. In this case, the longitudinal force F, which causes the element of the closed profile 1 to stretch, is decomposed into two components: normal N = 0.5 F, perceived by the coupling bolts 6, and tangent T = 0.866 F, transmitted to the supporting tables 3. Two bolt forces are reduced by two times as many times reduces the moments bending the flanges, and this allows the use of thinner sheets for them, thereby reducing the consumption of structural material. In addition, the material consumption of the proposed compound is positively affected by a possible reduction in the diameter of the coupling bolts 6, a decrease in their number, or a combination of the first and second.

To compare the proposed (new) technical solution with the well-known as the base object, a typical mounting connection was made on the flanges of trusses of coatings from bent-welded closed profiles of the Molodechno system (Steel structures of coatings of industrial buildings with spans of 18, 24, 30 m using closed bent-welded rectangular sections type "Molodechno". Series 1.460.3-14. Drawings KM. Sheet 44). The material consumption of the compared options is shown in the table, which shows that in the new solution it decreased by 47.1 / 26.8 = 1.76 times.

Name Sizes, mm Quantity, pcs. Weight kg Note 1 PC. all junction Flange 300 × 300 × 30 2 21,2 42,4 47.1 Known Solution Edge 140 × 110 × 8 8 0.5 * 4.0 Welds (1.5%) 0.7 Flange 300 × 250 × 18 2 10.6 21,2 26.8 Proposed solution Little table 27 × 150 × 8 2 2.6 5.2 Welds (1.5%) 0.4 * Triangular shape taken into account

In addition, it is necessary to take into account the consumption of material for the coupling bolts. In the known and proposed flange connections, the number of tie bolts is the same and is 8 pcs. If in the first of them M24 bolts were used, then in the second - M18 of the same strength class. Then it is obvious that in the new solution, the material consumption is reduced in proportion to the decrease in the cross sectional area of the net bolt, that is, 3.52 / 1.92 = 1.83 times.

Claims (1)

A flange connection of stretched elements of a closed profile, including the ends of the rods with flanges, coupling bolts and a sheet gasket between the flanges, characterized in that the flanges are installed at an angle of 30 ° relative to the longitudinal axes of the rod elements, and the sheet gasket consists of paired support tables rigidly fastened to the flanges and in the assembled joint, mutually abutting each other.

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