RU2597594C1 - Tubular (roll-welded) profiles of composite sections (versions) - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction and can be used as rod elements at development of bearing structures of buildings and structures of various purposes. Tubular (roll-welded) composite section profile using paired forming elements, one of which is a L-bar, connected with welds in the longitudinal direction along the shelves foils. Herewith the other forming element used in pair with the L-bar is a C-shaped roll-formed profile or a trough roll-formed profile with two equal-size walls adjoining the shelves of L-bar.

EFFECT: technical result is simplification of connections of composite components of tubular (roll-welded) profiles, more uniform distribution of structural material along the perimeters of their cross sections, as well as wider layout and unifying capabilities for bearing structures, reduced cost.

1 cl, 5 dwg, 1 tbl

Description

The proposed technical solution relates to the field of construction and can be used as bar elements in the development of load-bearing structures of buildings and structures for various purposes.

Known core elements from paired corners welded along the feathers of the shelves with each other with the formation of a square section [Metal structures: Textbook for universities. / Ed. Yu.I. Kudishin. - M.: Academy, 2007 .-- S. 234, Fig. 8.3, g]. The disadvantage of such core elements is their limited bearing capacity, due to the loss of the overall stability of the square profile due to the small radius of inertia.

A wider range of applications are rod elements of two channels joined by welds in the longitudinal direction along the feathers of the shelves [1. Metal constructions. In 3 t. T. 1. Elements of constructions: Textbook for high schools. / Ed. V.V. Grief. - M.: Higher School, 2004 .-- S. 345, Fig. 6.16, c; 2. Metal structures: Textbook for high schools. / Ed. Yu.I. Kudishin. - M.: Academy, 2007 .-- S. 234, Fig. 8.3, b]. In this case, the radius of inertia increases and a corresponding increase in the bearing capacity of the rod element is observed. However, its cross section is not equally stable due to the difference in the radii of inertia relative to the central axes, which is the reason for the irrational use of structural material.

Closest to the proposed one is a technical solution based on the distinctive essence of which is a tubular profile of a five-sided composite section of a channel and a corner joined by welds in the longitudinal direction along the feathers of the shelves [1. Kopytov M.M., Erokhin K.A., Matveev A.V., Kosintsev A.S., Yashin S.G. Thin-walled supporting structure of closed section. - Patent No. 2174576, 10/10/2001, bull. No. 28; 2. Kopytov M.M., Matveev A.V. Lightweight metal structures from five-sided pipes. - Tomsk: STT, 2007 .-- S. 8-9, Fig. 1.1, c; fig. 1.2].

For practical use, a range of such profiles has been developed in the range of forming channels from No. 5 to No. 36, where three versions of the layout of composite sections are possible [Kopytov MM, Matveev A.V. Lightweight metal structures from five-sided pipes. - Tomsk: STT, 2007 .-- S. 10, Fig. 1.3]:

- the extreme points of the feathers of the corner lie in the planes of the outer faces of the channel shelves;

- the extreme points of the feathers of the corner are located on the inner side from the planes of the outer faces of the channel shelves;

- the extreme points of the feathers of the corner are on the outside from the planes of the outer faces of the channel shelves.

Having the advantages characteristic of closed profiles, the given solution has certain disadvantages. Among them, the complexity of the point mates of feathers of corners and channels, negatively affecting the complexity of manufacturing tubular profiles. A significant difference in thickness and, as a consequence, the uneven distribution of structural material along the perimeter of the cross section. The marked range for form-forming channels is clearly not as wide as for bent profiles, which significantly narrows the layout and unification capabilities for load-bearing structures. In addition, numbered channels belong to shaped sections of rolled steel, the cost of which is higher than the cost of long steel, including corners and bent profiles.

The technical result of the proposed solution is to simplify the conjugation of the constituent elements of a tubular (bent-welded) profile, a more uniform distribution of structural material along the perimeters of their cross sections, as well as expanding layout and unification capabilities for load-bearing structures, reducing cost.

The specified technical result is achieved by the fact that in the tubular (bent-welded) profile of the composite section using paired forming elements, one of which is a corner joined by welds in the longitudinal direction along the feathers of the shelves, a bent C- is used as another forming element in pair with the corner a shaped profile or a bent trough profile, in which every two walls of the same size are adjacent to the shelves of the corner.

The proposed tubular (bent-welded) composite section profile has a fairly universal solution, the implementation of which can be used both rolled and bent elements, or combinations thereof. Here, in a pair of forming bent C-shaped or trough elements, there is a wide selection of equal and close to them in thickness not only rolling, but also bent corners. No less practical may be the replacement of corner elements with bent channels, the assortment of which is not inferior in length to the corners. At the same time, a wider shelf (horizontal edges) of a composite section 100 mm wide or more can be supported by a flooring or roofing fence, and narrower shelves can be used for frameless nodal joints with lattice elements of load-bearing structures. In the particular case, composite sections with lateral protrusions of the required size can be assembled from C-shaped and trough bent elements directly adjacent to each other without corner or channel elements. When leaning on these protrusions of enclosing structures, such a layout can provide an additional positive effect, since it allows you to replace special bent-welded profiles with cross sections of complex configurations according to well-known technical solutions [1. Levitan I.V. Farm from bent closed profiles. - Copyright certificate No. 449137, 11/05/1974, bull. No. 41; 2. Levitin E.V. Bent closed profile. - Patent No. 98155, 05.25.2010, bull. No. 28].

In all cases, the layout of composite sections for tubular wall profiles of equal sizes of C-shaped and trough elements due to their position perform two functions:

- create contacting areas that significantly simplify the pairing of the forming elements with each other;

- act in the form of stiffeners, significantly increasing the local (local) stability of the side faces of composite sections.

The proposed technical solution is illustrated by graphic materials, where in FIG. 1 shows a fragment of a tubular (bent-welded) profile of a composite section composed of a C-shaped and corner elements; in FIG. 2 - a fragment of a tubular (bent-welded) profile of a composite section composed of trough and corner elements; in FIG. 3 shows a fragment of a tubular (bent-welded) profile of a composite section composed of a C-shaped and channel elements; in FIG. 4 - a fragment of a tubular (bent-welded) profile of a composite section, composed of trough and channel elements; in FIG. Figure 5 shows a fragment of a tubular (bent-welded) profile of a composite section composed of a C-shaped and trough elements.

In one of the alternative versions, the proposed technical solution for a tubular (bent-welded) composite section profile includes a C-shaped forming element 1, formed by definition from GOST 14350-80 with three walls, two of which are the same size, are directed in one direction, and two shelves directed inward profile. The flanges of the corner element 2 are adjacent to two walls of the same size of the element 1. After careful alignment of the composite section, symmetrical with respect to the vertical, it is fixed and paired continuous or intermittent welds are laid in the longitudinal direction.

In another alternative version, the proposed technical solution for a tubular (bent-welded) composite section profile includes a forming trough element 3 formed, by definition, from GOST 14350-80 with three walls, two of which are of the same size, directed one way, and two shelves directed outward of the profile. The shelves of corner element 2 are adjacent to two walls of the same size of element 3, in full analogy with the first version. Here, as in the first version, after careful alignment of the composite section symmetrical with respect to the vertical, it is fixed and paired solid or intermittent in the longitudinal direction welds.

In particular cases, the tubular (bent-welded) profile of the composite section of both versions instead of the corner element 2 includes a channel element 4. It is also possible that the tubular (bent-welded) profile consists of a C-shaped element 1 and a trough element 3 that are directly joined to each other walls of the same size.

To compare the proposed technical solution with the well-known as the base object, upper (compressed) belts of five-sided pipes from steel grating runs with a span length of 12 m and permissible design loads of 6.2 were adopted; 7.9; 11.1; 18.2 (16.5) and 31.8 kN / m [Kuznetsov A.F., Kuznetsov V.A. Steel grating runs from pipes for building coatings, resistant to corrosion. - Volga Scientific Journal, 2012, No. 3. - S. 20-26]. The calculated parameters of the cross sections of five-sided pipes are taken from their range [Kopytov MM, Matveev A.V. Lightweight metal structures from five-sided pipes. - Tomsk: STT, 2007. - S. 113-114]. The new solution is represented by upper belts from a tubular profile of a composite section, including C-shaped elements according to GOST 8282-83, trough elements according to GOST 8283-83, corner elements according to GOST 8509-93 and GOST 19771-93.

The comparison is presented in tabular form, where the sections of the trough elements are conventionally marked with the letter "K" according to the designation adopted for bent C-shaped profiles. As you can see, the reduced consumption of structural material for the new solution has decreased. Its distribution along the perimeter of the composite section has become more uniform due to the fact that the difference in the thicknesses of the forming elements has decreased. The rejection of shaped profiles in favor of long steel reduces cost performance. From four to seven working versions of the new solution, each version of the base facility accounts for expanding layout and unification capabilities for load-bearing structures, providing the choice of the most optimal of them.

Claims (1)

A tubular (bent-welded) profile of a composite section using paired forming elements, one of which is a corner joined by welds in the longitudinal direction along the feathers of the shelves, characterized in that a bent C-shaped profile or a bent is used as another forming element in pair with the corner trough profile, in which two walls of the same size adjoin the shelves of the corner.

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