RU2357145C2 - Unit for connection of pipes of different diametre - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention is related to the field of construction, namely to units for connection of different diametre pipes. Unit for connection of different diametre pipes includes ends of pipes inserted one into another, ring welded into pipe of larger diametre and connection parts fixed to pipes by welding. Connection parts are arranged in the form of plates with cut, which fixes position of smaller diametre pipe relative to larger diametre pipe. Formulas are described for calculation of connection part parametres.

EFFECT: reduced labour-intensiveness of connection manufacturing and increased strength due to transfer of effort from smaller diametre pipe to larger diametre pipe through connection parts.

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Description

The invention relates to the field of construction, namely, to the nodes of the connection of pipes of different diameters, and can be used in the construction of multi-storey buildings and structures, towers, masts, supports of power lines, etc.

Known pipe connection node of different diameters, including the ends of the pipes, interconnected by a sheet diaphragm, attached to the pipes for welding.

A disadvantage of the known connection of pipes of different diameters is low strength, because joint strength is determined by the quality of the welds. In addition, in this connection there is a problem of delamination of the metal sheet diaphragm. When transmitting the force acting in a pipe of a smaller diameter through a sheet diaphragm perpendicular to the force, the thickness of the diaphragm is determined by the work of punching, which is uneconomical in terms of metal consumption.

Known pipe connection unit of different diameters, including pipe ends inserted into each other, an end cap, slots on a large diameter pipe and a connecting piece in the form of an annular element mounted on the end of a pipe of a smaller diameter, attached to the pipes for welding (RU No. 2288399).

A disadvantage of the known compound is the considerable complexity of its manufacture due to the presence of slots in the pipe of a larger diameter and plates welded to the pipe of a smaller diameter. A large number of welds in the place of the slots concentrated in the pipe section reduce the strength of the connection in this section. In addition, high accuracy is required when making slots and welding plates so that the slots and plates coincide during the connection.

Closest to the invention is a pipe connection unit of various diameters, including the ends of pipes inserted into each other, longitudinal stiffeners inserted into the through holes in the wall of the pipe of larger diameter and attached to the pipes for welding, and the end cap of the pipe of larger diameter (Gorev V. V. and others. Metal structures. T.3, Elements of structures. M .: Higher school, 1999, p. 98, fig. 6.9 b - prototype).

The disadvantage of the connection is the need to ensure high accuracy when making through slots, weakening the most stressed section of the pipe of large diameter.

The present invention is aimed at simplifying the manufacture of a pipe connection unit of different diameters and increasing its strength.

The problem is achieved in that the nodal connection of pipes of different diameters includes the ends of the pipes inserted into each other, a ring welded into the pipe of a larger diameter and connecting parts attached to the pipes for welding. The connecting parts are made in the form of plates with a cutout that fixes the position of the pipe of smaller diameter relative to the pipe of a larger diameter, while the smaller width h of the connecting parts is calculated by the formula:

h = l, 25 r,

where h is the smaller width of the connecting parts, cm;

r is the radius of the smaller pipe.

The thickness of the connecting parts is taken equal to the thickness of the smaller pipe.

The large width H of the connecting parts is calculated by the formula:

H = R-r + h,

where R is the radius of the larger pipe, cm;

r is the radius of the smaller pipe, cm;

h - smaller width of the connecting parts, see

The width of the parts was calculated from the condition that the moment of resistance of the cross section of the smaller pipe is equal to the moment of resistance of the cross section of four plates with their smaller width.

Figure 1 shows a General view of the node connecting pipes of different diameters; figure 2 - connecting part in the form of a plate; figure 3 is a section 1-1; figure 4 - stub in the form of a ring.

An annular element 2 is installed in a pipe of larger diameter 1 for spot welding, having equal internal diameters with a smaller pipe 3. On the pipes for welding, connecting parts 4 in the form of plates are installed.

For given pipe diameters for the manufacture of the connecting parts of the four plates, the smaller width of the connecting part 4 is calculated by the proposed formula.

The assembly of the connection node is performed in the following sequence. At the end of the pipe of smaller diameter 3, plates 4 are installed for welding. At the end of the pipe of larger diameter 1, an annular element 2 is installed for spot welding. The plates 4 are welded to the larger pipe 1.

The invention allows to reduce the complexity of manufacturing the connection and increase its strength due to the transfer of force from a pipe of a smaller diameter to a pipe of a larger diameter through the connecting parts.

Claims (1)

A node for connecting pipes of different diameters, including pipe ends inserted into each other, characterized in that a ring is welded into the pipe of a larger diameter, the node is made using connecting parts attached to the pipes for welding, the connecting parts are made in the form of plates with a cutout that fixes the position of the pipe of smaller diameter relative to the pipe of larger diameter, while the smaller width h of the connecting parts is calculated by the formula:
h = l, 25 r,
where h is the smaller width of the connecting parts, cm;
r is the radius of the smaller pipe,
the thickness of the connecting parts is taken equal to the thickness of the smaller pipe, the large width H of the connecting parts is calculated by the formula:
H = R-r + h,
where R is the radius of the larger pipe, cm;
r is the radius of the smaller pipe, cm;
h - smaller width of the connecting parts, see

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