双块式轨枕吊装堆放受力分析

Mechanics Analysis of Hoisting and Storage of Double-block Sleepers

研究目的:双块式无砟轨道的轨枕为工厂预制的钢筋混凝土结构,因此轨枕吊装、堆放是双块式无砟轨道施工中不可避免的环节。当轨枕多层堆放时,下层轨枕的桁架钢筋要承受其本身和上层所有轨枕的自重。因此,应对双块式轨枕运输、吊装、施工中可能出现的临时荷载进行强度检算。研究结论:双块式轨枕的强度检算主要是对堆放状态下轨枕桁架腹筋受力进行分析,使轨枕的桁架钢筋保持正常工作状态。本文对双块式轨枕堆放层数,给出了限制条件以及施工维护指导意见。

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.