【作者】 张佐安；

【导师】 田仲初； 李文琪；

【作者基本信息】 长沙理工大学 ， 建筑与土木工程， 2008， 硕士

【摘要】 钢管混凝土拱桥作为一种新兴拱桥,近年来,以其充分利用了钢管混凝土材料提高了承载能力,并与桥梁建设的良好适应性及施工的简便,外形美观而得到了极大的发展。本论文以位居同种桥型跨径世界第一位——净跨460m的巫山长江大桥为背景,通过对钢管混凝土拱桥的缆索吊装系统的设计与施工的研究,对钢管混凝土拱桥的关键施工技术进行了系统分析及计算,并实施成功,为后续施工的类似大跨径桥梁的建造提供了可借鉴的经验。由于跨度非常大,缆索吊装系统安装巫山长江大桥钢管拱肋,在实施上存在很多技术难点:缆索吊机系统的索跨大,钢管拱肋节段吊重大,吊运难度大;缆索吊装系统的索塔高度大,如何保证其稳定是难点;拱肋节段构件起吊高度大;桥位处两岸地形陡峭,拱肋节段安装时设置横向抗风索难度大;不能断航;桥位位于长江黄金水道上,处于长江巫峡峡口,风大,江面狭窄,水深流急,过往船只多,施工期不能长时间断航,只能短时禁航。本文研究的目的,就是要针对上述技术难点,通过研究计算开发设计出具有大索跨、大吊重能力的缆索吊机系统及斜拉挂扣系统,以适应大跨径钢管混凝土拱桥钢管拱肋顺利安装的需要。主要研究成果如下:1、综述了国内外的钢管混凝土拱肋安装技术,探讨了施工过程中的关键技术、施工重点和难点。2、研究了主索安装张力和安装垂度,计算了靠近塔架安装拱肋时主索的张力,分析了温度的改变对主索吊装系统的影响,并对一些细节构造进行了优化,成功设计和实施了巫山长江大桥的缆索吊装系统。3、应用有限元程序,对吊塔进行了强度验算,研究了吊塔变位对扣塔的影响,验算了扣塔的整体稳定性和强度。4、提出了钢管拱肋合理的安装工艺,保证了钢管拱肋安装安全和质量。更多还原

【Abstract】 In recent years, Concrete-Filled Steel Tubular (CFST) arch bridge as a new arch bridge, which takes full advantages of concrete filled steel tube materials, increase the bearing capacity of the bridge. It has been developed greatly beacause of its good adaptation and construction of simple, beautiful shape.This paper takes the Yangtze River Bridge in Wushan as engineering background, whose net span is the number one of the same kind of bridge in the world. Studying on cable hoisting system design and construction of the CFST arch bridge, the paper takes systematic analysis and calculations on the key construction technology of the CFST arch bridge ,and puts it in practice successfully which provides experience for the similar long-span bridge construction of the follow-up construction.As the span is large, cable hoisting system installed steel tube arch rib Wushan Yangtze River Bridge, there are many technical difficulties in the implementation: the span of cable crane system is very long, tube arch rib major segmental carrying is large , hanging is difficult, the tower of cable hoisting system is high, how to ensure its stability is difficult; the lifting height of arch rib segmental component is also very tall, both conditions of the bridge located is steep terrain, seting transverse direction wind cable is diffcult when install arch rib segments, navigation is not forbidden , the location of the bridge is on the gold channel of the Yangtze River, which is in the Wu Gorge Gap, where the wind is big , the surface of the river is narrow, the water is deep and flow rapidly, many passing ships, it can not be forbidden too long in the construction period, only short-term.The purpose of this paper is to design and develop the systems of cable hoisting and cable-stayed regarding to the above key technologies.The systems have the Characteristics of lang-span and big carrying capacity, which adapt to the need of arch rid successful installation of long-span CFST arch bridge , through studying and claculating. In this paper, the research results are as follows:1. The assembling techniques of arch rid of CFST arch bridge are introduced. The key techniques, and emphases and difficulties of construction are studied.2. The tensile force and deformation of the main cable are studied and the tensile force of the main cable are calculated when the arch rib is installed being close to the tower. The effects of temperature changing on the assembling system of main cable are investigated. The details about the conformation are optimized. Thus the assembling system of main cable is designed successfully and is put in practice. 3. The strength of cable tower is checked and the effect of offset of cable tower on main tower is studied by using finite element program. The stabilities and strength of the main tower are validated.更多还原