摘要
研究目的:大跨度钢桁拱桥结构新颖,线型流畅,外形美观,具有现代特色,与城市美景相呼应,是近年来城市桥梁的热门桥型之一。钢桁拱桥技术含量高,施工难度大,其跨中合龙方案及合龙措施的选择是整个工程成败的关键点。因此,本文特对此进行探讨。研究结论:万州长江大桥的顺利建成证明了:(1)通过调整前后支点的高差及一侧钢桁梁整体位移以消除悬臂端转角的影响,达到合龙杆件无应力状态合龙的方案是完全可行的;(2)合龙点变位分析计算与合龙时刻微调措施同样十分重要;(3)应根据各桥的实际情况,优选桁拱安装的顺序;(4)拱合龙后需通过计算分析决定是否采取拉设临时系杆的技术措施;(5)降低主墩临时支座高度是确保安全的重要措施之一。
Research purposes： Large span steel truss arch bridge has become more popular for recent years because of its new structure, smooth streamline form, good looking and modern characteristics, but it requires high technical contents with lots of difficulties in construction, especially the choices of midspan closure scheme and closure measures are essential to the successful construction of it, so the discussion is made on it in this paper. Research conclusions ：The successful construction of Wanzhou Yangtze River Bridge shows ： （ 1 ） The closure scheme of no stress on closure rod with adjusting height differences between the front support point and the rear support point and making one steel truss displacement to eliminate the influence of rotary angle of cantiever is feasible. （2） The calculation and analysis of position change of closure point is the same important as the fine adjustment in the course of closure. （3） The installation order should be optimized in accordance with the actual conditions of each bridge. （4） Whether the technical measure of installing binder is taken or not will rely on the calculation and analysis made after the closure. （5） Lowering the height of temporary support to master piler is one of important measures for safety.
出处
《铁道工程学报》
EI
北大核心
2008年第9期52-57,共6页
Journal of Railway Engineering Society
关键词
万州长江大桥
铁路桥
单拱连续钢桁梁
架设
Wanzhou Yangtze River
railway bridge
single arch continuous steel truss beam
erection
作者简介
刘承亮，1965年出生，男，高级工程师．
