RU2753595C1 - Connection unit for round pipe elements - Google Patents

Abstract

FIELD: building.

SUBSTANCE: invention relates to the field of building and can be used in construction of connection units for round pipe elements. The unit consists of a main element - a belt, and an adjoining element with a flattened end welded thereto. The connection of the elements in the area of junction is additionally reinforced by flat stiffening pieces located perpendicular to the plane of the flattened part of the adjoining element, welded along the contour of the elements with full engagement from both sides to the adjoining element, from the beginning of the flattened part thereof, and to the belt. The thickness of the stiffening piece and the legs of the welded seams are assigned according to the calculation depending on the intensity of the transmitted forces, and the width of each stiffening piece is equal to the radius of the belt.

EFFECT: increased rigidity of the connection in the transverse direction, ensured reliability and durability of the structure.

1 cl, 3 dwg

Description

The invention relates to the field of construction and can be used in the design of nodes for connecting elements from round pipes. Such structures have recently begun to be used quite widely in construction practice, since they have a reduced weight compared to the rolled profile.

Known nodal conjugation of the rods of tubular trusses with flattening the ends of the elements. [Textbook "Metal structures" for stud. institutions of higher. prof. education / [Yu.I. Kudishini et al.]; ed. Yu.I. Kudishina. - 12th ed., Erased. - M .: Publishing Center "Academy", 2010. Pp. 292, fig. 9.24 b)].

In this case, the tubular elements can be connected to each other at different angles by a weld along the flattening plane. The disadvantage of this solution is the great flexibility of the flattened element at the junction with another element in a plane perpendicular to the flattening plane, and as a result, local loss of stability of the rod from the round pipe is possible.

A similar knot is described in the book by P.I. Orlov. "Basics of design". Reference and methodological manual in 3 books. Book. 2. Ed. 2nd, rev. and add. M., "Mechanical Engineering", 1997. Pp. 190, fig. 197, view 26. A truss of round pipes is described here, consisting of chords (hereinafter, the main elements) and a diagonal lattice in which the elements of the diagonal lattice (hereinafter adjacent elements) have flattened ends, which are welded to the chords made of an undeformed pipe along it.

This technical solution was adopted as a prototype as the closest one both in essence and in the composition of elements.

The disadvantage of this solution is that the rigidity of the connection increases only in the plane of the element flattening, and from the flattening plane, the rigidity, on the contrary, decreases. In addition, as in the first case, and here, due to the local application of the load to the thin-walled element, local deformation is possible, which will lead to an unforeseen redistribution of the forces transmitted to the unit.

The technical result consists in increasing the rigidity of the connection in the transverse direction, which will exclude the possibility of loss of stability from the plane of the structure and ensure its reliability and durability.

The technical result is achieved by the fact that in the known junction of elements made of round pipes, consisting of a main element - a belt and an adjoining element welded to it with a flattened end, the feature is that the connection of elements in the area of their joint is additionally reinforced with flat stiffening ribs located perpendicular to the plane of the flattened part of the adjoining element, welded along the contour of the elements with full adjoining on both sides to the adjoining element from the beginning of its flattened part and the belt, while the thickness of the stiffener and legs of the welded seams are assigned by calculation depending on the magnitude of the transmitted forces, the width of each rib stiffness is equal to the radius of the chord.

Stiffeners oriented across the section. In this case, the shape of the face attached to the adjoining element in the flattening zone repeats its profile, and the shape of the face adjoining the main element has a circular shape, the diameter of which corresponds to the diameter of the main element. It can be seen from the calculations below that in this case there can be no loss of stability. In addition, these additional stiffening ribs reinforce a fairly thin chord wall against increased deformations.

The proposed constructive solution is illustrated by drawings.

FIG. 1 shows a sectional view of a round pipe connection.

Here: 1 - chord, 2 - adjoining element, 3 - stiffener.

FIG. 2 shows a side view along arrow A.

Here: 1 - chord, 2 - adjoining element, 3 - stiffener.

FIG. 3 shows a section at the level of the flat part of the flattened abutting element. Section 1 -1.

Here: 2 - adjoining element, 3 - stiffener.

The shape of the stiffener is selected in accordance with the shape and dimensions of the main element - the belt - 1 and the adjacent element - 2. The length of the stiffener -3 should be equal to the distance from the beginning of flattening of the adjacent element - 2 to the surface of the belt -1, and the width - half the diameter of the belt -1. The thickness of the stiffener is 3 and the legs of the welded seams are assigned according to the calculation, depending on the transmitted forces.

The following is an approximate calculation of the connection of pipes with a diameter of 273 mm, a thickness of 7 mm.

Flattened Width

Moment of inertia about the y-axis

Radius of gyration

Moment of inertia about the x-axis

Radius of gyration

With the calculated length of the flattened section of the adjoining element of the order of 10 cm, its flexibility about the y-axis will be 10 / 0.16 = 62.5, and about the x-axis 50 / 39.9 = 1.25. Which indicates that the loss of stability is excluded.

The use of the proposed invention by increasing the stability of the flattened end of the adjoining element and the local area of the main element - the belt in the joining zone with the help of stiffeners, makes it possible to increase the reliability and durability of the building structure.

Claims (1)

A node for connecting elements from round pipes, consisting of a main element - a belt and an adjacent element welded to it with a flattened end, characterized in that the connection of elements in the area of their joint is additionally strengthened by flat stiffeners located perpendicular to the plane of the flattened part of the adjacent element, welded along the contour elements with full adhesion on both sides to the adjoining element, from the beginning of its flattened part, and the belt, while the thickness of the stiffener and the legs of the welded seams are assigned by calculation depending on the magnitude of the transferred forces, the width of each stiffener is equal to the radius of the belt.

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