Novel slab ballastless track structure

Abstract

The invention relates to a novel prefabricated slab ballastless track structure for high-speed railways and urban rail transit. The novel prefabricated slab ballastless track structure comprises rails, fasteners, prefabricated track slabs, under-slab filling and adjusting layers, a base and limiting bosses, wherein the track slabs are of a middle hollowed-out frame structure (through holes), the bosses (5) are arranged on the base (4) corresponding to the middle through holes of the prefabricated track slabs, and the limiting bosses (5) are single or multiple. The novel prefabricated slab ballastless track structure has the advantages that the pulling stress to the adjusting layers can be reduced, the track slabs bear larger pulling stress and the high-strength large-rigidity functions of the track slabs can be fully performed; since the track slabs are provided with through holes, the manufacturing cost is reduced, the longitudinal temperature stress to the track slabs is also relieved and the warping of the corners of the unit slab track structure is greatly reduced; since the limiting bosses are located in the middles of the track slabs, the replacement of parts such as the track slabs and the repair and treatment such as elevation and deviation correction in case of non-uniform settlement of tracks are facilitated.

Description

technical field [0001] The invention relates to the field of ballastless track laying, in particular to a novel slab ballastless track and a manufacturing method thereof. Background technique [0002] At present, the types of ballastless track in my country mainly include CRTSⅠtype double block type, CRTSⅠtype slab type, CRTSⅡtype slab type and CRTSⅢtype slab type, which have different advantages and disadvantages in terms of project cost, construction efficiency and maintainability. [0003] The CRTS I type double-block ballastless track has high integrity, and the design and manufacturing technology of the sleeper can be used, and the cost is relatively low, but the cast-in-place track bed slab and the joint surface between the prefabricated sleeper and the old and new concrete of the track bed slab are prone to cracks; The track bed slab is cast-in-place concrete, the surface drainage slope is difficult to construct, the construction quality control is relatively difficul...

AI Technical Summary

Problems solved by technology

[0003] The CRTS I type double-block ballastless track has high integrity, and the design and manufacturing technology of the sleeper can be used, and the cost is relatively low, but the cast-in-place track bed slab and the joint surface between the prefabricated sleeper and the old and new concrete of the track bed slab are prone to cracks; The track bed slab is cast-in-place concrete, the construction of the surface drainage slope is difficult, the construction quality control is relatively difficult, and the construction efficiency is relatively poor. At the same time, when the track structure is destructively damaged, the maintainability is relatively poor

[0004] The CRTS Ⅰ slab ballastless track has good construction performance and repairability, and the convex abutment at the beam end bears the largest force, but the convex abutment at the beam end is semicircular, and its anti-deformation ability and adaptability to long-span bridges are relatively low. Poor; the performance stability and durability of cement emulsified asphalt mortar in the filling layer are greatly affected by raw materials, construction technology and climatic conditions, and the amount of emulsified asphalt is large, resulting in a relatively high material cost for the filling layer

[0005] CRTSⅡ type slab ballastless track has good structural integrity and longitudinal continuity, and good track smoothness, but its construction operation is cumbersome, and the maintainability of the longitudinal connection structure of the track slab is relatively poor. The integrity of the track slab is adversely affected, and the adaptability to later engineering adjustments is poor. The finishing of the track slab is expensive and the construction cost is the highest.

[0006] The CRTSⅢ slab ballastless track adopts self-compacting concrete instead of cement emulsified asphalt mortar. In order to prevent the concrete in the adjustment layer from cracking, steel mesh is laid, and door-shaped bars are pre-embedded under the track slab, so that the track slab and the self-compacting concrete adjustment layer are connected into one Overall, the structure has good durability, but the self-compacting concrete of the filling layer is mixed centrally and transported to the site by tanker for pouring, which leads to a large waste ratio and high cost. Poor repairability in the event of destructive damage

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