Key Technologies for Rapid Block Replacement of Elastic Support Block Ballastless Track in Heavy Haul Railway and Mixed Passenger and Freight Railway
In order to select appropriate construction parameters for the lifting and replacement of elastic support block ballastless track,a finite element model was established to study the effects of the spacing between lifting points,the length of fastener release,the amount of lifting,and the temperature difference between the construction rail temperature and the locking rail temperature on the deformation and stress of the track structure.The optimal range of each parameter was determined,and a fast replacement construction method for elastic support block ballastless track with diseases such as empty suspension,gap separation,and water accumulation in boots was proposed,which was applied on-site.The results show that the spacing between rail lifting points should be 1.2～3.6 m.At this time,the bending deformation of the steel rail is small,and the tension of the steel rail and the pulling force on the fasteners are small.For every 1.0 m increase in the spacing between lifting points,the temperature difference limit increases by 1℃.When the lifting amount is 16 cm and the distance between lifting points is 1.2 m,the length of loose fasteners should be greater than 31.8 m.For every 1℃increase in temperature difference,the length of the fastener release should be reduced by 2.4 m.The maximum tensile stress of the steel rail and the maximum pull-up force of the fastener increase with the increase of rail lifting amount.For every 1 cm increase in rail lifting amount,the maximum tensile stress of the steel rail increases by 0.66 kN,and the maximum pull-up force of the fastener increases by 0.075 MPa.
mixed passenger and freight railwayelastic support block ballastless trackrail liftingsupport block replacementrail lifting methodrail lifting amount
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维普
