RU174799U1 - CONSTRUCTION OF THE TOP BASIS OF THE BALLOWLESS WAY OF HIGH-SPEED RAILWAYS - Google Patents

Abstract

The utility model relates to the upper structure of a railway track intended for railways with a typical rolling stock, as well as for high-speed trunk lines with increased axial loads and high load-bearing strength. basalt-plastic nets, and composite concrete elements monolithic in the bearing plate - half sleeper 2, which are combined in pairs o into a single sleeper structure using a basalt-reinforced longitudinal reinforcing cage 3, while fiber concrete with mineral additives and modified fullerenes is used as composite concrete. The developed design provides increased durability of the upper base of the ballastless track of high-speed railways in a wide range of operating conditions.

Description

The utility model relates to the upper structure of a railway track intended for railroads with typical rolling stock, as well as for high-speed trunk lines with increased axial loads and high load-carrying capacity.

The reliability of the railway track is determined, first of all, by the stability of the basement. Operating experience of the main railway lines abroad has shown that one of the possible options for the construction of the upper base is a track on ballastless, i.e. slab base. The advantage of this design is maximum stability and stability for a long time compared with the ballast structure of the track. A.F. Kolos, I.S. Kozlov “Modern structures of the upper track structure for the construction of high-speed and high-speed railway lines” Petersburg State University of Railway Engineering, 2013

The known construction of the base contains two-unit reinforced concrete sleepers, which are monolithic in a reinforced concrete bearing plate made of concrete.

However, such a structure of the upper base of the track is characterized by the presence of cracks, a tendency to corrosion due to the use of metal reinforcement and, accordingly, insufficient durability.

For arranging the foundations of high-speed (300-350 km / h) railways, a method is known for arranging monolithic foundations of railways (RF patent No. 2150547 dated 06/10/2000), in which the horizontal sliding formwork forms a concrete section slab of a concrete section on which, after with a set of concrete strengths, precast reinforced concrete sleepers are installed with a given step, followed by leveling and filling the space between the profile and the sleepers with concrete.

This structure of the upper base of the path is also characterized by the presence of cracks, a tendency to corrosion.

The technical problem is the creation of the design of the upper base of the ballastless track of high-speed railways, which can be used on sections of direct and alternating current in various climatic conditions, as well as in conditions with a high content of substances aggressive to reinforced concrete, mainly without the use of secondary corrosion protection methods.

The technical result is to increase the durability of the design of the upper base of the ballastless track of high-speed railways in a wide range of operating conditions.

The problem is solved and the technical result is achieved due to the fact that the design of the upper base of the ballastless path consists of a supporting plate made of monolithic composite concrete reinforced with basalt-plastic rods and basalt-plastic nets, and composite concrete elements monolithic in the bearing plate - half-sleeper, which are combined in pairs in a single sleeper structure using a longitudinal reinforcing frame made of basalt plastic, while fibrous concrete with mineral additives is used as composite concrete modified fullerenes.

In the drawing of FIG. 1 is a schematic cross-sectional view of the developed utility model, where 1 is a carrier board made of monolithic composite concrete; 2 - composite concrete half-sleeper; 3 - reinforcing frame half sleeper; 4 - reinforcement of the supporting plate; 5 - rail track.

The developed design directly perceives the load from intermediate rail fastenings or rail supports, redistributes, resiliently processes and transfers it to the supporting layer or directly to the lower track structure, providing the specified accuracy of the rail track position in plan and profile.

The monolithic composite concrete base of the bearing plate and composite concrete half-sleepers are made of fiber-reinforced concrete with enhanced durability. The optimal composition of fiber-reinforced concrete is used, which differs in the content of a complex of effective active mineral additives that block the aggressive components of cement stone and, in combination with the presence of a basalt-plastic reinforcing cage, provides increased corrosion resistance and, accordingly, the durability of the structure as a whole.

Additives can be organic or inorganic substances introduced into concrete mixtures during their preparation with the aim of directionally regulating their technological properties and / or construction and technical properties of concrete and mortars, and / or giving them new properties.

The obvious advantages of concrete modified with carbon nanomaterial are a significant increase in compressive and bending strength, an increase in frost resistance and water resistance due to compaction of the concrete structure. When introduced into the mixture, nanosized particles play the role of nuclei of the structure formation of the nano-reinforcing element, zoning centers of neoplasms in the matrix of the modified fiber-reinforced concrete mixture, aimed at improving physical and mechanical properties due to components that strengthen the structure of fiber-reinforced concrete at micro and nanoscale levels (Uliana Vladimirovna, Ph.D. dissertation abstract Structural steel fiber concrete modified with complex carbon micro- and nanoscale additives). As the basis of the material, FIBROCONCRETE MIX can be used to obtain fiber concrete according to the patent of the Russian Federation 2386599.

When reinforcing, ROCKBAR basalt-plastic reinforcement is used as longitudinal reinforcement for the sleeper structure, and also as reinforcement for the grids of the bearing plate.

Fiber-concrete of a strength class of at least B 40 is used as a matrix of composite concrete for sleepers and a bearing plate. Basalt fiber is used as fiber, Portland cement is used as a binder, while additives for concrete modified with fullerenes must meet the requirements of GOST 24211.

Concrete brand for frost resistance should be at least F ₁ 400.

The waterproof grade of concrete must be at least W14.

Valve specifications are shown in the table.

The design of the upper base of the ballastless track has successfully passed tests for strength, stiffness and crack resistance, the results satisfy the following requirements:

a) failure occurred at a load greater than or equal to the test load for strength testing (1.6 × Pk);

b) the deflection did not exceed by more than 10% the control deflection at a load equal to the control load for stiffness testing (1.0 × Pk);

c) detecting the appearance of the first transverse cracks at a load greater than or equal to the control load for checking the crack resistance (1.0 × Pk).

Thus, the durability of the developed design of the upper base of the ballastless path is ensured by the use of basalt-plastic reinforcement and fiber concrete modified with fullerenes, with enhanced durability and, as a consequence, the absence of electrocorrosion.

The design of the upper base of the ballastless path has heat resistance, a high modulus of elasticity, the absence of shrinkage cracks, chemical resistance to microorganisms, alkaline and acidic environments, high water resistance, frost resistance and vibration resistance.

Durability is provided by:

the lack of steel reinforcement and, as a consequence, the absence of electrocorrosion;

fiber-reinforced concrete modified with fullerenes with increased characteristics of durability and resistance to shock and vibration;

lack of shrinkage cracks;

heat resistance;

high modulus of elasticity;

chemical resistance to microorganisms, alkaline and acidic environments;

vibration resistance;

high seismic resistance;

high water resistance;

high frost resistance;

reduction of explosive chipping of fiber-reinforced concrete in case of fire.

Claims (1)

The design of the upper base of the ballastless track of high-speed railways, consisting of a bearing plate and half-sleeves monolithic in the bearing plate, characterized in that the bearing plate is made of monolithic composite concrete reinforced with basalt-plastic rods and basalt-plastic nets, and half-sleepers are made of composite concrete elements reinforced with reinforced concrete frame made of basalt plastic, and combined in pairs into a single sleeper structure, while using as concrete comfort fiber concrete with mineral additives and modified fullerenes.

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