Abstract：Research purposes: The Double—block sleepers is one kind of factory prefabricated reinforced concrete structures，SO the hoisting and storage of sleepers become an inevitable link in the construction process of Double—block ballastless tracks．When the sleepers are hoisted layer by layer，the truss steel bars of the lower layer sleepers have to sustain the dead weight of both its own and the upper sleepers．Therefore，the strength of the sleepers under transportation，hoisting and construction load has to be calculated．
Research conclusions:In order to determine the layer number of the sleepers and make sure the truss steel bars are in normal working conditions，the calculation focuses on the stressing state of truss steel bars in the sleepers．It also provides US with the constraints and the advice of hoisting and storage of the Double—block sleepers．
Southwest Jiaotong University．Research on Double— block Sleepers of Experimental Sections of SuiYu Line [R]，Chengdu：Southwest Jiaotong University，2008．
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2010, Vol. 27 
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