大跨度钢桁架拱桥施工控制技术研究

发布时间：2018-01-09 03:26

本文关键词：大跨度钢桁架拱桥施工控制技术研究　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：由于钢桁架拱桥具有较强的竖向刚度和横向刚度,是跨越大江大河的常用桥型。随着我国桥梁向更长、更大、更柔的方向发展,施工控制的重要性益发突出,特别是在山区峡谷地区建设大跨度钢桁架拱桥,需要考虑的不确定因素较多。本文以在贵州纳界河钢桁架拱桥为工程研究背景,对大跨度钢桁架拱桥施工控制关键技术进行了研究。主要内容包括以下几个方面：1.针对斜拉扣挂悬臂拼装法,首先介绍了常见的三种索力计算方法,在此基础上尝试一种改进的索力计算法。该方法以“线形为主、索力为辅”作为施工线形控制原则,计算原理简单,能够较好地解决常见三种索力算法中出现的问题。2.以制造坐标建立该桥钢桁架拱肋拼装的有限元模型,经计算得到各节段的安装高程和各施工阶段的控制线形,并研究施工预抬高值对节段安装的影响。考虑扣塔变形、交界墩墩底应力、拱脚内力等施工限制条件,讨论了如何运用改进的索力方法进行施工控制,同时也分析了施工过程中温度对线形控制的影响。3.分析了大跨度钢桁架拱桥的合龙施工难点与控制要点,针对实际施工情况提出两种可能的合龙施工方案,讨论了两种合龙方案的优缺点,介绍合龙步骤及合龙过程中的调整方法。同时,分析了合龙后不同拆索顺序对结构线形、内力的影响。4.对钢桁架拱桥施工控制的误差原因进行分析和探讨,并分析荷载参数、钢桁架拼装误差以及合龙误差对结构施工状态及成桥状态的影响。
[Abstract]:The steel truss arch bridge with strong vertical and lateral stiffness, are common bridges across rivers. With our bridge to longer, larger, more flexible direction, the importance of the construction control of the more prominent, especially the construction of large span steel truss arch bridge in mountain valley area, more uncertain factors need take into consideration. In the Guizhou River, the steel truss arch bridge as the engineering background, the key technology of construction control of long span steel truss arch bridge are studied. The main contents include the following aspects: 1. for the cable-stayed cantilever assembling method, it introduces three kinds of cable force calculation on the basis of common methods. Try an improved cable force calculation method. This method uses linear based, supplemented by cable force "as the principle of linear control construction, simple calculation principle, can solve the common three kinds of algorithm in cable force The problem of.2. in manufacturing coordinate finite element steel truss arch rib assembling model of the bridge, the linear control of installation height of each segment and each construction stage is calculated, and the construction of pre elevation value of section installation. The effects of considering tower deformation, at the junction of pier bottom stress and internal force of arch foot the construction conditions, discusses how to use the improved construction method of cable force control, and also analyzed the temperature in the construction process of large span steel truss arch bridge closure construction difficulties and control points of the linear control of.3., according to the actual situation of the construction of two possible closure construction scheme, discusses the advantages and disadvantages two kinds of closure scheme, the adjustment method and process of the closure of the closure procedure. At the same time, analyzes the different order of demolition after closure of cable structure alignment, the internal force of the impact of.4. on the error control of construction steel truss arch bridge The reasons are analyzed and discussed, and the load parameters, the steel truss assembly error and the effect of the closure error on the construction state and the bridge forming state are analyzed.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.22

【引证文献】