Structural Design And Study Of Longitudinal Force Of Bi-block Ballastless Track With Longitudianlly Bed-plate On Arch Bridge

The longitudinal force of ballastless track on bridge is very complex. There is no ballastless track constructed on the arch bridge at home and abroad. So it is significant to carry out structural design and studying of longitudinal force of ballastless track on arch bridge, analyze which ballastless track is fit to be constructed on long-span arch bridge.To explore the application of ballastless track which make use of continuous bed plate on the arch bridge, this paper suggest four kinds of longitudinally bed-plate ballastless track based on the arch bridge in BeiPanjiang which are both tunnels in the end of bridge. They are combined with the feature of CRTS I bi-block Track and CRTS Ⅱ slab track. The force is separated between beam and track and the reinforced slab is in-situ. The first suggestion is "continuously reinforced slab integrated with continuous bed plate", the second suggestion is "continuously reinforced slab isolated with continuous bed plate", the third suggestion is "segmented reinforced slab integrated with continuous bed plate", the fourth suggestion is "segmented reinforced slab isolated with continuous bed plate". The finite element model of railway-slab-beam-bridge pier which has considered railway double-line is created. The longitudinal force of bi-block ballastless track on arch bridge which has four kinds of suggestions is analyzed in temperature force、deflection force、braking force、rupture force and broken plate force. By these calculations, we know that the fourth suggestion is better. And the vertical displacement of ballastless track which is caused by different pier height is analyzed.The transition zone between bridge and tunnel is re-designed. The continuously reinforced slab and continuous bed plate is anchored15meters from the tunnel. The mutation longitudinal force in the transition zone is eliminated and the force of whole structure is more reasonable. The friction coefficient of slide layer and extend stiffness of ballastless track which are factors for affecting the longitudinal force of ballastless track are analyzed.