RU2803435C1 - Collapsible superstructure with box-section blocks made of low-pressure polyethylene with increased load-carrying capacity - Google Patents

Abstract

FIELD: construction of railway collapsible bridges on railways.

SUBSTANCE: invention can be used for temporary and short-term restoration of railway bridges on rigid supports. In the lower belt of the structural block of the collapsible superstructure made of low-pressure polyethylene, where maximum tensile stresses occur, metal rods of a periodic profile are included, combined into a frame.

EFFECT: increase in the carrying capacity of the superstructure.

1 cl, 5 dwg

Description

The invention relates to the field of bridge construction, to the designs of prefabricated railway bridges, and can be used for temporary and short-term restoration of railway bridges on rigid supports.

A prefabricated span structure is known, made of low-density polyethylene, which consists of three sections, which in turn consist of two blocks. Each block consists of a lower chord, a vertical wall reinforced with transverse stiffeners, and an upper chord of H-shaped section, made of low-density polyethylene [1].

The disadvantage of the known span structure is that as its length increases, the load capacity decreases, due primarily to the insufficient design resistance of the material - low-density polyethylene [2].

The above-described design of a prefabricated span with box-section blocks made of low-density polyethylene was adopted as a prototype.

The purpose of the invention is to increase the load-carrying capacity of the structure.

This goal is achieved due to the fact that in the lower chord of the design block of a prefabricated span made of low-pressure polyethylene, where maximum tensile stresses occur, metal rods of a periodic profile are included along the entire length, united at the ends of each block using metal plates into a frame . Here, the design resistance of steel is 8 times higher [2,3] than that of low-density polyethylene, which makes it possible to increase the load-carrying capacity of the span.

The proposed design of a superstructure with increased load capacity is shown in the figure, where it is indicated in Fig. 1 - end view of the prefabricated span; fig. 2 - facade of a prefabricated span; fig. 3 - plan of a prefabricated span; fig. 4 – section of the lower chord of the span; fig. 5 – connecting linings of the lower chord of the span; pos. 1 – block of prefabricated span structure; pos. 2 - vertical walls of the block; pos. 3 – metal rods combined into a frame; pos. 4 – bottom plate; pos. 5 – internal and external stiffeners; pos. 6 – stiffening beam; pos. 7 – folding console; pos. 8 – top plate; pos. 9 – track rail, which has a terminal-bolt attachment to the top plate; pos. 10 – connecting gasket of blocks; pos. 11 – support plate with stiffening ribs, made of metal; pos. 12 – metal butt plate; pos. 13 - hinge; pos. 14 – wheel guard; pos. 15 – connecting plate.

Blocks of a prefabricated span 1, connected to each other by connecting gaskets 10 in a section. Next, the sections are connected to each other by metal sheet plates 12 and 15 into a span. Support linings with stiffening ribs 11 are located in places where the span rests on the support. The folding console 7 is hingedly attached to the block of the prefabricated span 1.

Information sources

1. RU 203403, U1, E01D 2/00, 2021.

2. Arkhipova Z.V., Grigoriev V.A. Low pressure polyethylene: Scientific and technical basis of industrial synthesis. – L: Khimiya, 1980. – 240 pp., ill.;

3. Hot rolled steel for reinforcement of reinforced concrete structures, GOST 5781-82.

Claims (1)

The design of a prefabricated span structure from spatial blocks, rigidly joined end-to-end by means of bolts and butt plates, where each section consists of two main beams connected by ties, the main beams of the span sections have a box-section shape and are made of low-density polyethylene, and their connection made directly with the help of overlays, characterized in that the lower chord of the blocks of the prefabricated span structure made of low-density polyethylene includes metal rods of a periodic profile along the entire length, combined into a frame.