Structure and method of combined composite sleeper

Abstract

The invention provides a combined composite sleeper structure and method based on a steel structure framework. The composite sleeper device of a composite structure comprises a steel structure and twocomposite sleepers (based on waste tires or plastic), and the steel structure is connected with ends of the composite sleepers (based on waste tires or plastic) through clamping plates and then connected through bolts or rivets. The novel composite material sleeper structure is produced by using renewable plastic, waste tires or polyurethane materials and a steel structure, and the structure hasexcellent mechanical properties. Requirements for sleeper effects in ballasted track structures are met, and defects of sleepers in the forms of existing wooden sleepers, concrete sleepers, compositesleepers and the like are overcome. The main advantages are that an elastic composite material rail bearing platform is adopted; elasticity is good; vibration damping performance and insulation performance are good too; and a bending moment and breaking resistance capacity in the sleeper are improved, and sleeper transverse crack diseases caused by a negative bending moment are avoided. And the reliability, the safety and the availability of the composite sleeper are enhanced.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a structure and method of a composite sleeper. Background technique [0002] In the railway ballast track structure, the sleeper has the following functions as an important part: the sleeper bears the all-directional pressure from the rail and elastically spreads to the ballast bed, and at the same time must effectively maintain the geometric shape of the track, especially the gauge and Sleeper direction. Therefore, the sleeper must have the necessary firmness, elasticity and durability, and it is convenient to fix the rail, and has the ability to resist longitudinal and lateral displacement. With the development of the track structure, the structure and material of the sleeper have undergone great changes. In terms of material, the sleepers currently in use include wooden sleepers, reinforced prestressed concrete sleepers and steel sleepers, and sleepers made of composite...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the special mechanical performance requirements of sleepers, a large amount of high-quality forestry resources are consumed, and due to the limited natural resources of forests in our country, the price of wooden sleepers is relatively expensive, 500 yuan a piece;

[0005] 2. Due to the different types and parts of the wood, the strength and elasticity of the line wooden sleepers cannot be guaranteed uniformly, resulting in uneven track stiffness;

[0006] 3. If the wooden sleeper is not anti-corrosion, it is easy to decay and wear, and the service life is short, only less than 10 years, or even only 5 years in the alternating wet and dry environment; if the wooden sleeper is treated with preservatives such as coal tar, the preservative will gradually penetrate, Volatilization will pollute the environment and people;

[0008] 1. The rigidity of the prestressed reinforced concrete sleeper is high, so that the impact force is large, the ballast bed and the roadbed are easy to deteriorate, and the maintenance cycle is shortened;

[0009] 2. Prestressed reinforced concrete sleepers are made of steel bars and cement, which consume a lot of steel bars and cement materials, and are difficult to recycle and reuse

[0010] 3. Prestressed reinforced concrete sleepers are bulky and difficult to transport, and at the same time, it is difficult to be dense in contact with the ballast bed, which may easily lead to empty hanging plates

[0013] 2. Composite sleepers made of recycled waste tires, plastics, etc. are cheap, but due to the characteristics of the material itself, the compressive strength of the sleeper, especially the bending and flexural strength is insufficient, and it is easy to break under the load of the train , especially in the middle of the sleeper, it is easy to cause the train to derail, thus limiting the application of composite sleepers

[0014] 3. The sleeper made of glass fiber polyurethane material (referred to as FFU sleeper) has the characteristics of high strength and bearing capacity, but the cost is too high. High, which limits the application and development of composite sleepers

[0015] From the above discussion, it can be seen that the use of existing materials and structural sleepers has inevitable and neglected shortcomings. In actual operation, it cannot adapt to the line conditions.

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