A Thickened Frame Type Ballastless Track Slab

Abstract

Provided is a thickened frame type ballastless track plate. The track plate comprises a base plate, bosses and track bearing tables. The base plate is of a cuboid, the two bosses are symmetrically arranged on one face of the base plate along the axis of the cuboid in the length direction, and the track bearing tables are evenly distributed in the length direction of the upper surfaces of the bosses. A through hole is formed in the base plate and is located between the two bosses symmetrically arranged on the base plate, and a frame structure connected between the two bosses through a transverse reinforcement concrete structure is formed. The thickened frame type ballastless track plate can effectively reduce track plate warping caused by temperature stress, eliminate a pull cracking phenomenon, and enhance running safety and comfort. The thickened frame type ballastless track plate is reasonable in structural stress, light, high in structural strength and capable of effectively improving the stress condition of a sleeper structural system, prolonging the service life of the structure and optimizing rack circuit parameters, improves the circuit transmission characteristic of a resonant track, can be directly and effectively connected with a current high-speed railway CRTS-I ballastless track plate, and is suitable for industrial production.

Description

technical field [0001] The invention mainly relates to high-speed railway ballastless track slab technology, in particular to a thickened frame type ballastless track slab. Background technique [0002] At present, my country's high-speed railway ballastless track CRTS-I type slab generally adopts ordinary reinforced concrete structure, and its structure type is solid type. Due to the defects of its structure itself, the harsh environment of the ballastless track system, and the poor physical and mechanical properties of ordinary concrete, the existing high-speed railway ballastless track slabs generally have track slab cracking and the gap between the steel mesh in the track slab and the rail current. The mutual inductance between them deteriorates the primary parameters of the track circuit, which seriously affects the safety and durability of the ballastless track slab. [0003] At present, the main problems of ordinary concrete slab track include: [0004] 1. Under the...

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Problems solved by technology

[0004] 1. Under the action of temperature gradient, the solid ballastless track slab will produce warping deformation and warping stress, resulting in uneven stress on the track slab and its lower mortar layer, and large tensile and compressive stress at the corner of the slab. The compressive stress may even exceed the strength of the mortar, causing damage to the mortar;

[0005] 2. The warping deformation of the track slab may also cause the gap between the track slab and the mortar layer, causing the track slab to beat the mortar when the train passes by, accelerating the damage of the mortar; seriously affecting the service life of ordinary concrete ballastless track slabs;

[0006] 3. Due to the poor mechanical properties of ordinary concrete, under the joint action of train load and temperature gradient, the tensile stress of the upper and lower surface layers of the track slab will exceed the allowable tensile stress of the concrete, causing the track slab to crack; the compressive stress of the track slab at the point where the wheels act may The allowable compressive stress of the concrete will be exceeded, and the fatigue characteristics of the concrete will further reduce its strength under repeated action, which will cause local crushing of the track slab;

[0007] 4. The weight of the solid track slab requires large machinery and equipment during the installation and replacement of ordinary concrete track slabs, making installation and replacement difficult, and this is contrary to the aesthetic concept of modern structures moving towards light weight, and causes serious waste;

[0008] 5. In order to reduce the occurrence of cracks, the solid track plate applies prestress to the structure. Due to the small size of the track plate, the temperature difference and relaxation caused by the prestress loss are relatively large, and the effective prestress obtained is small; the other track The thickness of the slab is small, and the application of prestress will easily lead to cracks at the anchor end of the track slab, resulting in the occurrence of diseases such as concrete falling off and steel bar corrosion;

[0009] 6. Since ordinary concrete track slabs are all hot-rolled steel bars, and the mutual inductance between the steel mesh and the rail current deteriorates the track circuit parameters, making the AC effective resistance in the rail impedance too large and the inductive current too small, resulting in a resonant track circuit Reduced transmission length

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