RU222011U1 - Butt connection unit for rectangular pipes protecting them from deformation along the joint line under the influence of loads - Google Patents

Abstract

The butt joint refers to connections of tubular metal structures, including metal frame structures used in furniture production. The claimed butt joint assembly contains at least one composite pipe of a metal structure, composed of at least an upper rectangular tubular element and a lower rectangular tubular element. The butted tubular elements are butted to each other at their ends and rigidly connected with a connector and screws. Identical semicircular recesses are made at the ends of two opposite walls of the upper tubular element. At the ends of two opposite walls of the lower tubular element there are semicircular protrusions of identical shape, which are located in semicircular recesses at the ends of the walls of the upper tubular element. The connector is located inside the rectangular pipes in the area of their junction, and the tubular elements are inclined to the horizontal plane and their longitudinal axes of symmetry are located on the same straight line. The technical result of the utility model is to increase the reliability of the butt connection of inclined tubular elements joined at their ends. 4 ill.

Description

This technical solution relates to threaded butt connections of profile elements of metal structures using screw connectors in butt connections.

The technical solution is intended for use in furniture production, construction, mechanical engineering and electrical engineering in butt joints of profile rectangular pipes in the manufacture of volumetric modular and frame metal structures.

Known are the connection units for profiled rectangular pipes located one above the other, each of which contains at least one composite metal structure pipe made up of two tubular metal structure elements, which are butted to each other at their ends and connected by a connector.

A connection unit for vertically arranged tubular elements, in particular connections of tubular elements, containing a connecting liner and a liner retainer is known (RU 537175 A1, November 30, 1976). The prior art knows the design of a rigid frame connection unit, made in the form of metal box-section profiles, containing two corrugated metal linings, the corrugations of which are made with flat bases, and the linings are attached on both sides of the corner joint so that the flat bases are superimposed on opposing flat edges profiles near the corner connection point and are attached to them with self-tapping screws, and the corrugations of the linings run perpendicular to the bisector of the profile connection angle (RU 179262 U1, 01/17/2018 - prototype).

The common features of the joint presented in this description and the joint disclosed in the prototype are the features that characterize the butt joint of rectangular pipes with their protection from deformation along the joint line under the influence of loads, containing at least one composite pipe of a metal structure composed from at least an upper rectangular tubular element and a lower rectangular tubular element, which are butted to each other at their ends and rigidly connected by a connector and screws.

The presence of two corrugated overlays creates additional thickness for the frame assembly, covers the useful space in the corner, forms a closed niche on both sides and requires a large number of screws, which reduces the reliability of the butt joint.

The technical result of the solution presented in this description is to increase the reliability of the butt joint of rectangular pipes in cross-section, located obliquely to the supporting horizontal surface.

The technical result is obtained by a butt joint of rectangular pipes with their protection from deformation along the joint line under the influence of loads, containing at least one composite pipe of a metal structure, composed of at least an upper rectangular tubular element and a lower rectangular tubular element elements, which are butted to each other at their ends and rigidly connected by a connector and screws, and at the ends of the two opposite walls of the upper tubular element there are identical semicircular recesses; at the ends of the two opposite walls of the lower tubular element there are semicircular protrusions identical in shape, which are located in semicircular recesses on at the ends of the walls of the upper tubular element, the connector is located inside the rectangular pipes in the area of their junction, and the tubular elements are inclined to the horizontal plane, and their longitudinal axes of symmetry are located on the same straight line.

Figure 1 shows a butt joint of inclined rectangular pipes of a frame metal structure.

Figure 2 shows a butt joint of vertically located rectangular pipes of a metal frame structure.

In Fig.3 – view A in Fig.1.

Figure 4 shows an example of using a butt joint.

The butt joint assembly of the metal structure (Fig. 1) has an upper rectangular tubular element 1 in cross section and a lower rectangular tubular element 2 in cross section, while elements 1 and 2 are joined at their ends along joint line 3.

Elements 1 and 2 are located on the same straight axis of symmetry 4 (Fig. 1), which is inclined to the horizontal plane 5 at an angle α. Each mentioned tubular element has (conventionally) front and rear walls 6 and 7 and two side walls 8, which form a closed profile of a rectangular pipe in cross section.

To make a butt connection of inclined pipes, a connector is used, including a plate 9 (Fig. 3), in which transverse through holes are made. A threaded bushing 10 is fixed coaxially with each hole on the plate 9. Each bushing has a thread for a screw 11 (or bolt), which is screwed with interference into the threads of the bushing 10 in the working position of the connection. Each threaded bushing 10 is secured to the connector plate 9 by any known means (pressing, welding, screwing, riveting).

At the ends of the front wall 5 and rear wall 6 (Fig. 1) of the upper tubular element 1 there are identically shaped semicircular recesses 12. At the ends of the front wall 13 and the rear wall 14 of the lower tubular element 2 there are identically shaped semicircular protrusions 15, which are without gaps located in semicircular recesses 12 of tubular element 1.

In the presented example implementation, the upper tubular element 16 (Fig. 4) is similarly joined to the lower tubular element 17 of the metal structure frame. In this connection, elements 16 and 17 are located on the same axis of symmetry 4, which is located at a right angle of 90° to the horizontal plane 5, and the connection of these elements is made along the joint line 18. The left and right parts of the metal structure are connected to each other by an upper tubular bridge 19 and a lower tubular bridge 20, and each of them has a rectangular closed profile in cross section.

In the working position, when the metal structure is loaded with force P (Fig. 4) and elements 1, 2 and 16, 17 are under load, the compression forces from the upper tubular elements 1 and 16 are transferred to the lower elements 2 and 17. The lower element 1 of the left part The metal structure along the joint line 3 at an inclined angle α to the horizontal plane 5 transfers a compression force to the lower element 2. At the same time, on the right side of the metal structure, the compression force from the jumper 19 and the upper element 16 is transmitted to the lower element 17 of the metal structure along the joint line 18, located parallel to the horizontal planes 5.

Under static load P on the metal structure during its operation, at the junction 3 (Fig. 1) of the tubular elements 1 and 2 of the metal structure, a horizontal lateral force arises, transmitted from the upper element 1 to the lower element 2. In this case, at the joint 3 a shear force of the upper element occurs 1 relative to the lower element 2. Due to the fact that the joint 3 has a semicircular protrusion 15 at the lower end of element 2, the lateral shear force arising on element 1 is dampened by the semicircular protrusion 15 of element 2, located in the semicircular recess 12 of the upper U-shaped element. As a result, the total load on the plate 9, threaded bushings 10 and screws 11 and the deformation of the walls of the tubular elements in the area of their junction are reduced. At the same time, the strength and reliability of the butt joint of tubular elements increases, and the possibilities of using the butt joint described above in thin-walled structures are expanded.

With a static load P on the vertically located tubular elements 16 and 17 (Fig. 2) of the metal structure, a shear force does not arise at the joint 18, however, when dynamic loads occur at the joint 18, forces acting on the joint in horizontal directions may occur. Due to the fact that the joint 18 of the right part of the metal structure has semicircular protrusions 15 at the end of the lower tubular element 17, the lateral shear forces arising on the metal structure from dynamic loads are damped by the semicircular protrusions 15 of the lower tubular element 17. As a result, the total load on the connector of the right joint 18 is reduced , and the reliability of the connection of the elements of the right side of the metal structure increases.

The technical solution presented in this description has advantages over known solutions in terms of increasing the reliability of the presented connection of frame metal structure elements. At the same time, the manufacturability of the described metal structures with inclined elements assembled from individual pipe sections has been significantly improved, which meets the logistics conditions.

Claims (1)

A unit for butt jointing of rectangular pipes with their protection from deformation along the joint line under the influence of loads, containing at least one composite pipe of a metal structure, composed of at least an upper rectangular tubular element in cross-section and a lower rectangular tubular element in cross-section, which the ends are joined to each other and rigidly connected with a connector and screws, characterized in that at the ends of the two opposite walls of the upper tubular element there are identical semicircular recesses, at the ends of the two opposite walls of the lower tubular element there are semicircular protrusions identical in shape, which are located in semicircular recesses on at the ends of the walls of the upper tubular element, the connector is located inside the rectangular pipes in the area of their junction, and the tubular elements are inclined to the horizontal plane and their longitudinal axes of symmetry are located on the same straight line.

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