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| Technical Study of a New Type of Steel Bar Truss Sleeper |
| LIU Yu - xiang，GUAN Ji - bo，ZUO Yi - zhou，HUANG He – shan |
| (The Third Railway Survey and Design Institute Group Corporation，Tianjin 300142，China) |
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Abstract Abstract : Research purposes : In order to solve the inherent defects problems existing commonly in short sleeper and long sleeper ballasted track of urban rail transport，a new type of steel Tar truss sleeper is proposed through the study in this paper. On the basis of calculation and analysis in mechanics according to the experiences in high speed railway double block sleepers and combined With the actual situation of urban rail transport engineering，a reasonable types of steel bar truss sleeper structure dimensions and design technology requirements are put forward，which can provide the reference to the design of ballastless track in urban rail transport. Research conclusions:( 1 ) In order to adapt to the diferent manufacturing conditions， two types of steel bar tri^ss sleeper are studied and put forward: single tri^ss scheme and two tri^ss scheme. Single tri^ss scheme sleeper is applicable to the traditional sleeper fabrication techniques of urban rail transport，and the two tri^ss scheme sleeper is applicable to the new sleeper factory by a mechanized way manufacturing. ( 2 ) The structure of single truss sleeper structure is suggested as : a pair of reinforced concrete sleeper blocks are connected as a whole through a set of tri^ss composed of 3 main longitudinal bars and connecting bar (horizontal and vertical )，the steel truss is buried in sleeper block and not sticked out the bottom of the sleeper. ( 3 ) The structure of two tri^ss sleeper is suggested as ： a pair of reinforced concrete sleeper block are connected as a whole through two corrugated steel bar tri^sses. The upper parts of steel Tar truss is arranged in the sleepers，and the lower parts is out of the bottom of the sleepers. (4) The proposed size of sleeper block is: lengtli of 540 mm， upper width of 260 mm， lower width of 280 mm， height of 170 mm. It uses C50 reinforced concrete structure. (5) According to mechanics analysis， the structure of steel bar truss sleeper meet stress and deformation requirements under the effects of different loads. ( 6 ) The steel bar truss sleeper has been laid on a large scale in the line 7，9，11 of the third phase project of Shenzhen urban rail transport，which brings good effects. (7) The research results can be applied in unban rail transit projects.
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Received: 05 September 2016
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2016, Vol. 33 
