RU203403U1 - Collapsible superstructure with box-section blocks made of low-pressure polyethylene - Google Patents

Abstract

The utility model relates to the field of construction of collapsible railroad bridges on railways. It can be used in the temporary and short-term restoration of railway bridges on rigid supports. The purpose of the utility model is to reduce the weight of the structure. This goal is solved due to the fact that the load-bearing elements of the collapsible superstructure are made of low-pressure polyethylene, which consists of three sections, consisting, in turn, of two blocks. Each block consists of a lower belt, a vertical wall reinforced with transverse stiffeners, an upper belt of H-shaped cross-section, made of low-pressure polyethylene. Here, the specific gravity of these structures made of low-pressure polyethylene is 7 times less than those of steel.

Description

The utility model relates to the field of bridge construction, to the structures of collapsible railway bridges, and can be used for temporary and short-term restoration of railway bridges on rigid supports.

A collapsible metal bridge span is known, including main beams with gussets, each gusset is made with arcuate slots centered relative to the longitudinal axis of the corresponding main beam, transverse struts, diagonal ties with holes at the ends, attached to the gussets by high-strength bolts, each of which passed through one of the arcuate slots in the gusset plate and the hole at the end of the diagonal tie [1].

The disadvantages of the known superstructure are the high labor intensity of the assembly due to the large number of bolted joints and the need for the device of the superstructure of the track.

The closest in technical essence and the achieved effect are collapsible superstructures SRP-18NS, SRP-23NS, SRP-33.6NS each consists of at least two spatial blocks, rigidly joined end-to-end by means of bolts and butt plates, and sidewalks with pivoting consoles on hinges, each spatial block consists of two main beams of I-section, interconnected by transverse, upper and lower longitudinal ties and inter-track flooring elements, each main beam consists of a lower chord, a vertical wall reinforced with transverse stiffeners, an upper chord H-shaped section with laid on it and attached bolts of the rail track, the lower longitudinal ties are attached to the lower chords of the main beams, the inter-track deck is bolted to the upper chords of the main beams [2].

The above-described design of collapsible superstructure SRP-18NS, SRP-23NS, SRP-33.6NS is taken as a prototype.

The disadvantages of the prototype are that the main bearing elements - the main beams of the superstructure have significant weight, which complicates their transportation to the assembly site, installation, dismantling and is rather difficult to assemble due to the large number of dissimilar assembly marks, which requires the involvement of qualified personnel.

The purpose of the utility model is: to reduce the weight of the structure.

This goal is solved due to the fact that the load-bearing elements of the collapsible superstructure are made of low-pressure polyethylene, which consists of three sections, consisting in turn of two blocks. Here, the specific gravity of these structures made of low-pressure polyethylene is 7 times less than those of steel [3].

To preserve the specified strength properties of the proposed structure, it is proposed to replace the shape of the main I-beams with a box-shaped one.

The number of assembly marks is significantly less in comparison with the superstructure taken as a prototype:

- SRP 33.6 NS - 377 pcs. (without bolts) [2];

- Collapsible superstructure with box-section blocks made of low-pressure polyethylene - 166 pcs. (no bolts).

The proposed superstructure design is shown in the figure, where FIG. 1 - view of the collapsible superstructure from the end; fig. 2 - facade of a collapsible superstructure; fig. 3 - plan of collapsible superstructure; pos. 1 - block of collapsible superstructure; pos. 2 - vertical walls of the block; pos. 3 - bottom plate; pos. 4 - internal and external stiffeners; pos. 5 - stiffening beam; pos. 6 - folding console; pos. 7 - top plate; pos. 8 - track rail with terminal and bolt attachment to the top plate; pos. 9 - block connecting strip; pos. 10 - support plate with stiffening ribs, made of metal; pos. 11 - metal butt plate; pos. 12 - hinge; pos. 13 - wheel bar.

Blocks of collapsible superstructure 1, interconnected by connecting spacers 9 in the section. Further, the sections are interconnected by metal sheet plates 11 to form a superstructure. Support plates with stiffening ribs 10 v are located in the places where the superstructure rests on the support. The hinged console 6 is hingedly attached to the block of the collapsible superstructure 1.

Information sources

1. SU 606916, A1, E01D 15/12, 1978.

2. Grigoriev B.M., Soloviev S.N. Temporary restoration of railway bridges. Tutorial. - SPb .: VTU ZhDV RF, 2003.S. 17-22.

3. Arkhipova Z.V., Grigoriev V.A. Low-pressure polyethylene: Scientific and technical foundations of industrial synthesis. - L: Chemistry, 1980 .-- 240 p., Ill.

Claims (1)

The design of a collapsible superstructure of 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, characterized in that the main beams of the superstructure sections are box-shaped and made of low-pressure polyethylene , and their connection is made directly by means of overlays.

Images