SU1742392A1 - Multispan bearing system - Google Patents

Abstract

SUMMARY OF THE INVENTION: A multi-span support system consists of sections, each of which includes extreme and middle columns and rectangular forms located between them, one ends of which are mounted on the fixed supporting parts of the extreme columns and rigidly attached to them, and others movable bearings on the upper surface of the middle column. Each section of the system is equipped with a movable in the horizontal direction supporting unit located on the middle column. 1 il.

Description

The invention relates to construction equipment and can be used in the construction of bridges.

A known pavement system consisting of ceiling trusses and columns with support nodes 1.

The lack of such a system is associated with high material intensity and the cost of its construction.

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Also known is a multi-span support system consisting of sections, each of which includes extreme and middle columns and located between them having upper and lower self-rectangular trusses, one ends of which are mounted on fixed supporting parts of extreme columns and are rigidly fixed in level. to them, while others are installed through movable support parts on the upper surface of the middle column with the formation of a gap between the ends of the trusses 2.

However, the known support system has an insufficient carrying capacity with extended spans and greater material consumption.

The purpose of the invention is to reduce the material consumption of the system while increasing its load carrying capacity.

The goal is achieved by the fact that each section of the system is equipped with a horizontal moving support unit consisting of a horizontal shelf located in the level of the upper trusses mounted on the vertical bridge mounted on the upper part of the middle column between the ends of the trusses and supporting platforms supported on trusses by means of pre-stressed rods converging under the platforms, rigidly fixed with diverging ends to the upper and lower trusses themselves, while the supporting platforms are made po- dvyukny 1I supporting portions is (A

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between the upper surface of the platform and the lower surface of the horizontal shelf.

The drawing shows a multi-span support system.

The system contains upper 1 and lower 2 semi-trusses, supporting columns 3 and 4 along its edges, pivotal elements 5 and 6 of a rigid connection between a rectangular truss with extreme columns 4 and a fixed support 7, a movable support 8 from the side of the column 3 and an additional horizontal support movable unit consisting of a horizontal shelf 9 located in the level of the upper trusses mounted on the vertical bridge 10 mounted on the upper part of the middle column 3 between the ends of the trusses and the supporting platforms 11 supported on trusses dstvom converging platforms under prestressed rods 12 and 13, wherein the support platform adapted to support the movable portions 14, and between the diverging ends of the prestressed rods vertical member 15 is mounted.

Such a technical solution ensures the reduction of the material consumption of the system while simultaneously increasing its load carrying capacity due to the creation of a preliminary voltage of opposite tension on the truss trusses.

The multi-span support system works as follows.

After the truss is mounted on the fixed 7 and main movable 8 supports located at its ends, one of the sides of the truss is rigidly connected to the upper end of the supporting column 4 by rods 5 and 6. After that, an additional horizontal support movable in the horizontal direction is mounted x 12 and 13, a pre-stress is created, which results in loads in the movable support part 14 of the platform, acting in the direction opposite to the main movable support 8. This is accompanied by the formation of preliminary stresses simultaneously in both of the 1 and 2 trusses, compressing it in the lower section and stretching it in the upper section.

those. at opposite voltages from the workloads and the own farm. When the temperature changes, the end of the truss, equipped with the main 8 and additional 14 movable supports, moves freely in the horizontal direction, which allows maintaining stable values of the prestress in the truss truss for any temperature fluctuations and changes in connection with this linear dimensions farms.

With this solution, with an equivalent payload, a reduction of 3.5 times the stress in the Sah farm is achieved,

which allows an almost 80% increase in the span length of the truss with the same cross section.

Claims (1)

Invention Formula A multi-span support system consisting of sections, each of which includes the extreme and middle columns and located between them having upper and lower rectangular forms, one ends of which are mounted on the fixed supporting parts of the extreme columns and rigidly fixed in level with them , while others are installed through the movable support parts on the upper surface middle column with the formation of a gap between the ends of the trusses, characterized in that, in order to reduce the material intensity of the system while simultaneously increasing its carrying capacity, each The section of the system is equipped with a horizontal movable support unit consisting of a horizontal shelf located in the level of the upper trusses mounted on the vertical bridge mounted on the upper part of the middle column between the ends of the trusses and supported on the trusses by means of converging under the platforms previously eg rods, rigidly fixed with diverging ends to the upper and lower trusses themselves, while the supporting platforms are made with movable supporting parts located ezhdu upper surfaces of the platforms and the bottom surface of the horizontal shelf. 8 15 /; P 9 P 1