Bridge Ballasted Track Welded Turnout Space Mechanics

With the developing of high-speed railway and urban rail transit, turnouts are laid on bridge. Combing technical characteristics and problems of continuously welded rail and jointless turnout, the pavement of jointless turnout on bridge, is the most difficult aspects of continuously welded rail so far. Although many researches about continuously welded rail and jointless turnout have been done at home and abroad, no one is to study them independently. Until now, no researches on paving over-section jointless turnout on bridge have been made relative systematically, and so hasn't application experience yet. Thus it is extremely urgent to carry out research work in this field.The ballastless track will be increasingly employed in high-speed railway, so this paper makes focus on the research for jointless turnout of ballastless tracks on bridges as to establish the jointless turnout spatial mechanics model based on the finite element method, and study its law of forces and deformations. Through contrasting with the result of jointless turnout on slab, we get the character of the forces and and deformations of jointless turnout on ballastless bridge. The most factors which affect jointless turnout on ballastless birdge are analyzed : such as temperature variation of bridge, arrangement form of bridge bearing, span length of a bridge, temperature variation of track, resistance of fastener, expansion joints, retainer etc. In this paper summary analysis has been done on the position of the most unfavorable load. This result can be used to guide the design, the construction and the maintenance of jointless switch on bridge.