高流速深水大型沉井施工及配套技术研究

发布时间：2018-03-18 22:21

本文选题：桥梁　切入点：基础　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国江河纵横,海域面积大,随着我国桥梁建设向宽阔水域、外海方向发展,一座座跨江河跨湖海的特大型桥梁应运而生。随着地质条件的复杂化和水深与流速的加大,对桥梁基础的修建要求越来越高,超大型深水沉井基础结构型式相继出现,同时给施工建造也带来了更大的技术挑战。目前国内深水超大型沉井的施工及配套技术资料匮乏,在施工中会遇到许多新的技术难题,这就需要学习和借鉴国外已有的深水基础的先进成果和技术,并结合我国实际情况和具体桥梁工程进行认真研究。本文依托沪通铁路长江大桥工程的建设规模及建桥条件,对高流速深水大截面沉井的施工方案及关键施工技术进行了系统的研究。本论文共分六个部分：第一章绪论阐述了选题的目的及内容,评述了国内外研究现状,介绍了本文依托的工程背景。第二章对沉井的加工制作及质量标准,下河方式的比选、助浮方案及浮运技术进行阐述。第三章介绍了沉井定位系统,提出了“钢锚桩+重力式锚锭”组合定位系统的新型定位方案,此方案定位比较精确,操作方便。其创新点在于主锚缆绳在钢锚桩上的作用点位于河床面上,钢锚桩受力的自由悬臂长度大幅减小,从而极大地减小了钢锚桩的规模,节省了投资。第四章对沉井下沉技术进行研究,包括沉井下沉计算、沉井下沉施工方法、吸泥下沉和定位着床。第五章是主要研究了混凝土沉井的接高技术,结合沉井的下沉,分析了混凝土沉井的接高模板配置,对混凝土沉井的浇筑顺序进行了研究。第六章是结束语,对本文所做工作进行总结,对下一步工作进行展望。
[Abstract]:With the development of bridge construction in our country towards wide water area and offshore direction, a super large bridge across rivers and lakes emerges as the times require. With the complication of geological conditions and the increase of water depth and velocity, The construction requirements of bridge foundation are more and more high, and the super-large deep water caisson foundation structure types have appeared one after another, at the same time, it has also brought greater technical challenge to construction. At present, the construction and supporting technical data of ultra-large deep water caisson wells in China are scarce. Many new technical problems will be encountered in construction, which requires learning and drawing lessons from the advanced achievements and techniques of deep-water foundations in foreign countries. Based on the actual situation of our country and the concrete bridge project, this paper relies on the construction scale and conditions of the Yangtze River Bridge on the Shanghai-Stock Exchange Railway. The construction scheme and key construction technology of high velocity deep water and large section caisson are systematically studied. This paper is divided into six parts: the first chapter introduces the purpose and content of the topic, and reviews the current research situation at home and abroad. This paper introduces the engineering background of this paper. The second chapter describes the fabrication and quality standard of caisson, the comparison and selection of downriver way, the scheme of assisting floatation and floating transportation technology. Chapter 3 introduces the positioning system of caisson. In this paper, a new positioning scheme of "steel anchor pile gravity anchor ingot" combined positioning system is put forward. This scheme is accurate and easy to operate. The innovation of this scheme is that the main anchor cable on the steel anchor pile is located on the surface of the river bed, and the main anchor cable is located on the surface of the river bed. The free cantilever length of steel anchor pile is greatly reduced, which greatly reduces the scale of steel anchor pile and saves investment. Chapter 4th studies caisson sinking technology, including caisson sinking calculation, caisson sinking construction method, Chapter 5th mainly studies the high connection technology of concrete caisson, and analyzes the configuration of concrete caisson height form combined with sinking of caisson. The pouring sequence of concrete caisson is studied in this paper. Chapter 6th is the conclusion. The work done in this paper is summarized and the future work is prospected.
【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】：U445.557

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