Double-layer bidirectional pre-tensioned track plate

Abstract

The invention relates to a track plate, in particular to a double-layer bidirectional pre-tensioned track plate, which comprises a track plate, wherein the track plate is symmetrically provided with a layer of transverse pre-stressed reinforcement set and a layer of longitudinal pre-stressed reinforcement set on the two sides about the neutral axis respectively; the longitudinal pre-stressed reinforcement sets are distributed in the same horizontal plane of the track plate; the transverse pre-stressed reinforcement sets are distributed in the same horizontal plane of the track plate; the clear spacing between the longitudinal pre-stressed reinforcement set and the transverse pre-stressed reinforcement set on the same side of the track plate is not less than 6 mm; two vertical stirrups are arranged in a pre-stressed reinforcement anchoring region around the track plate respectively; the middle part of the track plate is also symmetrically provided with a vertical stirrup along the longitudinal direction of the track plate about the plate center; an insulating layer is arranged on the outer side of the vertical stirrups.

Description

technical field [0001] The invention relates to a track slab, in particular to a double-layer bidirectional pretensioned track slab. Background technique [0002] In 1964, Japan's Shinkansen came out; in 1981, France's TGV system was opened; in 1989, Germany's ICE high-speed train was put into operation. The high-speed rail technology of these three countries is relatively developed, and the track structure is relatively mature, which is representative to a certain extent. [0003] Japan's high-speed rail adopts slab-type ballastless track, and the track slabs that are finally put into engineering applications are mainly two-way post-tensioned prestressed slabs (photo 1) and hollow lattice slabs, also known as frame slabs (photo 2). The hollow lattice slab is lattice-shaped on the plane, and the frame slab is formed by longitudinal concrete strip members under two steel rails and multiple transverse connecting members. Such members can be prestressed or non-prestressed. ...

AI Technical Summary

Problems solved by technology

[0012] (1) CRTS I and CRTS II type track slab transverse prestressed steel rods (or steel bars) are arranged at the neutral axis position of the section (photo 11, 12). When the track slab is bent, the strength of the prestressed steel cannot be effectively exerted, so In addition to prestressed steel rods (or steel bars), non-prestressed steel cages (or steel mesh sheets) must be configured to supplement the deficiencies in the bending capacity of the plate (Photo 13)

This not only greatly increases the amount of steel used and man-hours, but also adversely affects the durability of the track slab (insufficient thickness of the protective layer) and the signal circuit (insulation performance)

[0013] (2) Since the width of the track slab is only 2.5 meters, if the post-tensioning process is adopted, the retraction of the steel bar and the deformation of the anchorage will cause a large loss of prestress, reduce the effective precompression stress of the concrete, and cause the crack resistance of the track slab ( Especially the fatigue crack resistance) ability is significantly reduced

[0014] (3) The CRTS II plate is not prestressed longitudinally, so it is impossible to avoid a large number of transverse cracks (photo 14)

[0023] (1) Too much steel consumption: CRTS I and CRTS II track slabs must be equipped with non-prestressed steel cages (or mesh) to supplement the lack of bending resistance of the slabs. The steel cages account for the total of CRTS I track slabs 1 / 2~3 / 4 of steel consumption;

[0024] (2) The insulation cost of the steel cage (or mesh);

[0025] (3) Anchors and anchor pads are required for CRTS I-type plates;

[0026] (4) The production efficiency of the CRTS I-type panel factory is low, which increases the number of panel factories and labor costs;

[0030] (1) Single track limit method, poor adaptability and inconvenient application

[0031] (2) CRTS I-type boards and frame boards can only be manufactured in a single piece, and cannot get rid of the backward production technology of manual workshops, and it is difficult to realize industrialization and automation

[0032] (3) CRTS I and CRTS II track slabs are imported from abroad, without independent intellectual property rights, and cannot meet the requirements of my country's high-speed rail complete technology competition in the international market

Images