RU77886U1 - STEEL FARM - Google Patents

Abstract

The invention provides a steel truss, consisting of belts connected by a grate and a cable with anchors at the ends, located in the lower zone, and stops. Anchors are located at a distance from the stops, providing the necessary arrow of the cable sag during the collapse of the truss. Such a device prevents the fall of the farm during an accident on equipment and people

Description

The invention relates to construction and can be used in the construction of buildings with expensive equipment or large crowds.

Known steel truss, consisting of upper and lower belts, interconnected by a lattice, and removed from the lower belt rack with a tightening of high-strength steel / 1 /. However, during an accident, such a truss structure does not prevent it from falling onto expensive equipment and people below, with corresponding consequences.

Known steel truss, consisting of upper and lower zones, interconnected by a lattice, and placed in the region of the lower zone of the cable with anchors at the ends, and stops / 2 /.

The disadvantage of such a steel truss is its fall during an accident on the expensive equipment and people below.

Closest to the technical solution to the present invention is a steel truss, consisting of upper and lower belts connected by a grid, and placed in the region of the lower belt of the cable with anchors at the ends, and stops / 2 /.

The disadvantage of such a steel truss is its fall during an accident on expensive equipment and people located below, which leads to equipment failure and human casualties.

The purpose of the invention is to prevent the fall of the farm during an accident on expensive equipment and people, the preservation of equipment and people from death.

This goal is achieved by the fact that the steel truss, consisting of upper and lower chords, interconnected by a lattice, a cable of high-strength steel with anchors at the ends, located in the region of the lower chord, and stops. A distinctive feature of the proposed truss design is that the anchors are removed from the stops at distances that provide the necessary arrow of the cable sag when the truss collapses after the anchors approach the stops.

Due to the presence of these signs, the expected effect is achieved, namely, that when the truss is destroyed during an accident, the end sections of the cable slip in the holes of the stops, the anchors approach them and the cable turns into a flexible thread of a single-belt hanging system, the bearing capacity of which is greater than the bearing capacity of the farm. At the same time, shock absorbers can be installed between the anchors and stops. After destruction, the farm is supported by this thread and hangs over the downstream equipment and people who remain intact and saved.

Figure 1 shows a steel truss in operable condition, and figure 2 presents its one of the possible positions after destruction.

The steel truss consists of the upper 1 and lower 2 belts, interconnected by elements of the grill 3. On the lower belt there is a cable 4 with anchors at the ends 6 and stops 5. Near the stops, there may be shock absorbers 7 that soften the shock. The cable is not subject to preliminary tension and the anchors are removed from the stops by a distance that provides, after approaching the stops, the necessary arrow of the sag of the flexible thread into which the cable is converted when the truss collapses. In figure 1, 2 roof structures are not conventionally shown.

When the farm is destroyed during an accident, which may be accompanied by a break in the lower belt 2, the extreme sections of the cable 4 slip in the holes of the stops 5 until the anchors 6 reach the shock absorbers 7, and through them the stops 5, as shown in FIG. 2 . Under the influence of the mass of the roof and the truss, the cable will sag, forming a flexible thread of a hanging single-belt structure, the bearing capacity of which can be several times greater than the bearing capacity of the truss. Therefore, it will absorb the load from the destroyed coating, preventing the death of people and the failure of expensive equipment.

The implementation of the proposed design is illustrated by the use of steel trusses from twin corners above the turbogenerator hall with a span of 24 m. With a design load of 14.27 kN / m, the weight of each truss is 1940 kg FS 2.4-1.45. Assuming that their collapse occurs when the load is 2 times higher than the calculated one, we provide cables of the type ТК GOST 3068-74 with a diameter of 55 mm double twist 25.0 m long, which will provide a sag arrow when the coating collapses 3.0 m and the perception of increased load compared to the original 2.5 times. The total metal consumption of each farm will increase by only 18%. The metal consumption of a conventional truss truss, perceiving this load, should be 2.5 times greater than expected

Information sources

1. Metal structures: Special. course: Textbook for high schools / E.I. Belenya, N.N. Streletsky, G.S. Vedenikov and others: Ed. E.I. Belenya - 3rd ed., Revised. And add. - M.: Stroyizdat, 1991 - 687 p. Fig.

2. Ferenchik P., Tohachek M. Pre-stressed steel structures: Perev. with him. M .: Stroyizdat, 1979.- 423 p. Fig.

Claims (1)

Steel truss, consisting of upper and lower belts, interconnected by a lattice located in the region of the lower belt of the cable with anchors at the ends and stops, characterized in that the anchors are removed from the stops by distances that provide the necessary arrow when the truss collapses when the anchors approach the stops cable sag.