摘要
武汉鹦鹉洲长江大桥主桥为三塔四跨悬索桥。该桥北锚碇基础设计阶段,综合考虑地理、地质、水文、工期等因素,比选确定采用圆形沉井基础;在城市建筑物密集区域,并紧邻长江防洪大堤,沉井基础下沉会对临近建造物造成安全威胁,也会破坏城市生态环境。为解决建造物密集区域建造超大沉井下沉关键技术难点,结合工程实际,通过调查类似工程案例,采取科学试验、数据模拟分析、监控监测等研究方法,评估、确定了结构防护、工艺优化、管道排渣、新型空气幕助沉等关键技术,证明了在城市市区、场地狭小、防护要求高等特殊条件下建造超大沉井的可行性,为城市基建工程环境保护提供借鉴和参考。
The main bridge of Wuhan Yingwuzhou Yangtze River Bridge is a suspension structure with 3 towers and 4 spans. During the design phase for the anchor foundation at the north bank, lots of factors have been taken into consideration such as geographic, geologic, hydrologic and construction time consume. It has been ultimately determined by applying round caisson foundation. Within the urban region densely distributed of architectures also in adjacent of the flood levees, the settlement of the caisson will cause safety threats to the nearby buildings and damaging the fragile city environment. In this essay, focusing on how to resolve the key point of overcoming settlement issue of the huge caisson within urban areas, by abstracting the construction practices, investigating similar cases of engineering, applying research methods including scientific experiments, data analysis, tests and surveillance, the key technologies including structure protection, process optimization, dregs removal from the pipelines, new air curtain for assisting the settlement have been assessed and confirmed. It has ultimately proved the possibility for applying the huge caisson within the city area with very limited space while with high standards for protection, making the counter effects that improves the method itself and pushing the technology advancing forward, providing valuable experience and reference to the construction of urban infrastructure and environmental preservation.
作者
沈涛
SHEN Tao(China Railway Major Bridge Engineering Group Co.,Ltd.,Wuhan Hubei China,430050)
出处
《广东公路交通》
2019年第5期100-106,共7页
Guangdong Highway Communications
关键词
沉井
防护结构
地下连续墙
反压下沉
管道排渣
空气幕
监测
caisson
protection structure
slurry wall
counter-pressure settlement
pipeline dregs removal
air curtain
monitoring and controlling
