海上地锚悬索桥超大沉箱锚碇设计方法研究

发布时间：2018-02-01 07:37

本文关键词： 超大型沉箱跨海大桥悬索桥锚碇基础　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着各地区间经济、政治交流的愈加密切,交通运输的便捷直接影响着城市的发展。跨海大桥结构不仅解决了临海(或入海口)城市与近海岛屿、跨海湾、海峡两岸城市的交通运输问题,同时,兼具景观效果。目前国内建成的跨海大桥如杭州湾大桥、青岛海湾大桥等即成为了地标性景观建筑。跨海大桥的跨度一般都较大,对桥梁技术要求很高,是顶尖桥梁技术的体现。地锚式悬索桥以其可适应大跨径且具有外形优美等优点,对景观有要求的工程更为适用。地锚式悬索桥的下部结构设计一直是整个工程的重点和难点。海上地锚悬索桥下部基础面临的海洋环境更加恶劣,波浪力、水流力等荷载较大,地质情况和泥沙冲淤情况复杂。因此,锚碇基础的选取及设计尤为重要。悬索桥的锚碇一般有隧道式锚碇和重力式锚碇,海域中可采用重力式锚碇。为了使荷载完全传至持力层,一般采用扩大基础、桩基础、沉井基础、管柱基础、组合基础等深水下基础,这些结构水上施工作业量大,施工工艺相对复杂,且工期较长。本研究将港口工程码头结构中常用的沉箱结构设计理念引入跨海大桥锚碇基础的设计中,以超大型沉箱结构替代传统的锚碇结构,降低了水上施工作业量,节省工期。构建用于跨海大桥锚碇结构的超大型沉箱结构的有限元分析模型,提出结构设计方法。并以大连南部星海大道主桥采用地锚式悬索桥超大沉箱锚碇基础为例,对其进行结构设计。最后通过物理模型试验,提出超大型沉箱锚碇基础在实际工程中的施工方法,证明这种超大型沉箱锚碇结构的实用性。本研究结论为海上人工构筑大型基础结构具有一定的参考意义。
[Abstract]:With the closer economic and political exchanges among different regions, the convenience of transportation has a direct impact on the development of cities. The structure of cross-sea bridge not only solves the problem of coastal cities and offshore islands, but also straddles the gulf. At the same time, both sides of the Taiwan Strait city traffic and transportation problems, as well as landscape effects. At present, the domestic cross-sea bridge, such as Hangzhou Bay Bridge. Qingdao Bay Bridge has become a landmark landscape architecture. The span of sea crossing bridge is generally large and the technical requirements of bridge are very high. It is the embodiment of the top bridge technology. The ground anchor suspension bridge can adapt to the long span and has the advantage of beautiful appearance. The design of the substructure of the ground anchor suspension bridge is always the key and difficult point of the whole project. The marine environment of the bottom foundation of the sea anchor suspension bridge is even worse and the wave force is more severe. Therefore, the selection and design of Anchorage foundation is particularly important. The anchorages of suspension bridges generally have tunnel Anchorage and Gravity Anchorage. Gravity Anchorage can be used in the sea area. In order to transmit the load completely to the bearing layer, the deep water foundation such as enlarged foundation, pile foundation, caisson foundation, pipe string foundation, combined foundation and so on are generally adopted. These structures have large amount of work, complex construction technology and long construction period. This paper introduces the common design concept of caisson structure in port engineering wharf structure into the design of Anchorage foundation of cross-sea bridge. The superlarge caisson structure is used to replace the traditional anchor structure to reduce the amount of construction work on the water and to save the construction period. The finite element analysis model of the super large caisson structure used for the Anchorage structure of the cross-sea bridge is constructed. The structural design method is put forward. The large caisson Anchorage foundation of the ground anchor suspension bridge is used as an example for the main bridge of Xinghai Avenue in the south of Dalian, and the structural design is carried out. Finally, the physical model test is carried out. This paper puts forward the construction method of super large caisson Anchorage foundation in actual engineering, and proves the practicability of this super large caisson Anchorage structure. The conclusion of this study has certain reference significance for artificial construction of large foundation structure at sea.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.25

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