摘要
钢制球铰转动体系在施工跨越既有线的斜拉桥、连续梁等转体桥梁中已经得到越来越广泛的应用,采用此种施工方法可以大幅度降低施工难度,减小施工风险,但是在具体施工过程中,却经常出现因为钢制球铰安装出现缺陷导致转动体系工作异常的情况,使施工计划推进困难。从影响钢制球铰安装的若干因素入手进行分析,对球铰设计、制造、安装、现场施工管理多方面进行了一定的讨论,最后提出对砂筒进行充分的预压、预设充足的钢撑脚与下滑道支架之间的间隙是保证转体顺利进行的重要工作细节之一。希望桥梁工程技术人员关注转体桥梁上转盘施工前的各项准备工作,积极防范因为转体系统钢撑脚与下滑道顶紧导致无法正常施工可能带来的风险。
The steel ball hinge rotary system finds wider and wider applications in swivel bridges,such as cable-stayed bridges and continuous beam bridges.The adoption of this construction method may greatly lessen the difficulty of construction and reduce the construction risks to a great extent,but in the process of the concrete construction,the abnormal work of the rotary system often happens because the steel ball hinges are improperly fixed,in which case it is difficult to carry out the construction scheme as planned.This paper starts with the analysis of certain influential factors in fixing steel ball hinges,and then discusses problems related to the design,manufacture and installation of the spherical hinge,the management of the site construction and many other aspects,with some important details finally put forward,such as fully pre-pressurizing the sand tube and providing enough steel braces and sufficient gap for the lower slide way,to ensure the smooth operation of the rotary system.It is highly desirable that all the bridge engineering and technical personnel concerned on the turntable should pay great attention to and do agood job of the various preparatory work before the rotary system begins to work,and actively prevent construction risks resulting from the steel braces and the lower slide way butting each other,in which case the construction will be stopped.
出处
《国防交通工程与技术》
2015年第2期20-23,共4页
Traffic Engineering and Technology for National Defence
关键词
桥梁转体施工
转动体系
球铰
砂筒
钢撑脚
construction of the rotary system for bridges
rotary system
ball hinge
sand tube
steel brace
