都市快轨交通·第30券第5期2017年10月
doi :10. 3969/j. issn. 1672 -6073. 2017. 05. 011
《学术探讨
长联大跨连续梁桥无缝线路布置方案
杨新文1，赵亮，宫寅2
（1.陕西城际铁路有限公司，西安710065；2.中铁上海设计院集团有限公司，上海200070）
摘要：西安机场线渭河特大桥采用长联大跨连续梁，主桥连续梁联长900m，最大温度跨度715m，具有温度跨度大且多跨连续梁相接的特点，需合理设计无缝线路。针对该工况提出5个无缝线路布置方案，采用有限单元法进行无缝线路附加力计算，从钢轨强度、桥墩受力两方面进行方案比选后，现场调研国铁类似工况，确定最终推荐方案。得出结论：（50+8×100+50）m连续梁两侧梁端布置单向钢轨伸缩调节器，满足钢轨强度
检算的要求且能有效减小相邻连续梁固定墩受力，无需布置双向钢轨伸缩调节器。关键词：地铁；长联大跨连续梁；无缝线路；钢轨伸缩调节器
中图分类号：U231
文献标志码：A
文章编号：1672-6073(2017)05-0060-05
ArrangementSchemesofContinuousWeldedRailforLongSpanand
Long Unit Continuous Girder Bridge YANGXinwen',ZHAOLiang',GONGYin(1. Shaanxi Intercity Railway Co., Ltd., Xian 710065 ;
2. China Railway Shanghai Design Institute Group Co., Ltd., Shanghai 200070)
Abstract: The long span and long unit continuous girder was applied in Wei River grand bridge of Xi'an Airport Line. The span eeoeaae0ee teristics of long temperature expansion length and multi-long-span continuous girders. As a consequence, the reasonable arrange-ment for continuous welded rails is needed. Five options of laying continuous welded rails are offered in the paper; the longitu-dinal force due to temperature variation is calculated by the finite element method. Judging from the rail strength, the pier force and the field investigation in similar railway projects, the authors conclude that the scheme of the one-way rail expansion joint(REJ) on both sides of the (50 + 8 × 100 + 50) m continuous girder without two-way REJ can meet the requirements of check calculation of rail stresses and efficiently decrease the fixing pier force of the adjacent continuous girder.
Keywords: metro; long span and long unit continuous girder; continuous welded rail; rail expansion joints
工程概述 1
西安机场线滑河特大桥具有温度跨度大、多跨连续梁相接的特点，该工况无缝线路布置方案是设计难点[12]，其大桥主桥连续梁效果图见图1。桥跨布置为: (2 ×30 +3 ×30 +3 ×30 + 105 +2 ×38. 5 + 4 ×50 +(50 + 8 × 100 + 50) + (60 + 111 + 94 + 100 + 60) + 3 × 30+3×25)m。其中,4×50m与(50+8×100+50)m连续粱的温度跨度为550m(50+8×100+50)m与（60+ 111+94+100+60)m连续梁的温度跨度为715m。主
修回日期：2017-01-26
收稿日期：2016-11-26
第一作者：杨新文，男，本科，高级工程师，从事轨道交通轨道工程技
术警理工作，1193070229qq.com
60URBAN RAPIDRAILTRANSIT
桥（50+8×100+50）m连续梁位于直线、平坡地段，除
图1渭河特大桥主桥（50+8×100+50)m
连续梁效果图
Fig. 1 Effect diagram of(50 + 8 × 100 + 50) m continuous girder of Weihe River grand bridge