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连续梁桥上双线两组道岔对称布置和咽喉区外侧的单渡线是客运专线建设中主要的无缝道岔群布置形式,为了指导和完善连续梁桥上铺设道岔群时道岔和桥梁的设计方法,本文根据桥上无缝道岔纵向相互作用原理,建立了道岔—桥梁—墩台一体化有限元计算模型,以18号无缝道岔铺设在连续梁桥上为例,分析了这两种常见道岔群的纵向受力与变形规律。计算结果表明,两组道岔对称布置时,可按单组道岔进行计算,墩台承受两组单开道岔的传力;单渡线这种岔桥布置对道岔与桥梁的受力都是有利的。
In the continuous beam bridge, the symmetrical arrangement of two pairs of two-way turnouts and the one-way crossing outside the throat area are the main types of seamless turnout groups in the construction of passenger dedicated lines. In order to guide and perfect the design of turnouts and bridges in laying turnouts on continuous girder bridges Based on the principle of longitudinal interaction of the seamless turnout on the bridge, the integrated finite element model of turnout-bridge-abutment is established. Taking the joint of the 18th turnout on the continuous beam bridge as an example, Longitudinal Forces and Deformation Law of Turnout Group. The calculation results show that the symmetrical arrangement of the two groups of turnouts can be calculated by a single set of turnouts and the piers and abutments bear the force of two groups of single turnouts. The arrangement of single turnouts is beneficial to the stress of turnouts and bridges .