Separation-prevention design of concrete-filled steel tubular member and sleeper block of ballastless track

Abstract

The invention discloses separation-prevention design of a concrete-filled steel tubular member and a sleeper block of a ballastless track. The design is characterized in that the outer end, embedded in the sleeper block (1), of a hollow steel pipe is provided with a part (3) with the radial width increased within the length range smaller than 50 mm, in the pouring process of the hollow steel pipe,the part (3) with the radial width increased is fully filled with concrete, and in the pouring process of the sleeper block (1), the part and the sleeper block (1) are casted into a whole. The formedconcrete filled steel tube end is subjected to flaring treatment, after the concrete-filled steel tubular member is poured to enter the sleeper block, the periphery of the steel tube is tightly wrapped by the concrete, and under the external load effect, the concrete-filled steel tubular member cannot be pulled out and separated. Flaring is quite beneficial to filling of a filling material into the steel tube, the steel tube can be rapidly and efficiently filled fully, compactness is ensured, diseases are prevented, the life expectancy of the whole sleeper structure is improved, the later-period maintaining cost is reduced.

Description

technical field [0001] The invention belongs to the field of ballastless track concrete sleepers, and in particular relates to an anti-detachment structure of ballastless track concrete-filled steel tube components and sleeper blocks, and a ballastless track concrete-steel sleeper with the anti-detachment structure. Background technique [0002] In the railway ballastless track system, there is a kind of prefabricated sleeper. The sleeper is installed in the ballast bed or is poured with concrete and the ballast bed as a whole. It is used to install fasteners, further fix the upper rail, and need to maintain good connection performance with the ballast bed. But there are also following defects: [0003] 1. The surface of the existing concrete filled steel pipe is a relatively smooth steel surface. After it is directly embedded in concrete and other materials, the gripping force in contact with it is limited. [0004] 2. The diameter of the hollow steel pipe is small, and it...

AI Technical Summary

Problems solved by technology

[0003] 1. The surface of the existing concrete-filled steel tube is a relatively smooth steel surface. After it is directly embedded in concrete and other materials, the gripping force in contact with it is limited. The combination between the concrete-filled steel tube and the sleeper block is not firm enough, and it is prone to loosening

[0004] 2. The diameter of the hollow steel pipe is small. It is very difficult to pour concrete into the steel pipe. The compactness inside the pipe is not enough, and the compactness between the exit of the steel pipe and the sleeper block is not enough, which brings hidden dangers to the overall sleeper structure and high maintenance and repair costs in the later period.

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