104
D01:10. 7672/sgjs2015060104
施工技术
CONSTRUCTIONTECHNOLOGY
2015年3月下第44卷第6期
港珠澳大桥快速人工建岛施工关键技术
沈永兴，李业勋，张李
（中交三航局第二工程有限公司，上海
200122）
【摘要】根据港珠澳大桥东人工岛大直径钢圆简和钢副格相结合的快速成岛施工工艺，详细介绍了快速人工建岛施工技术在工程中的应用。东人工岛成岛施工采用八锤联动液压振动锤将大直径钢筒插人海底不透水土层，形成人工岛体外轮离，然后在钢四筒及钢圆筒构成的岛体内吹填砂土，并采用塑料排水板联合堆载预压、水上挤密桩等工艺对岛体内外的软土层进行地基处理，最终形成稳定的岛体结构。快速人工建岛施工工艺的成功运用实现
了深海大型人工岛的快速成型、规模化作业和环保施工，为外海海洋资源开发提供了可靠的工程保障。【关键词】桥架工程；人工岛：大直径钢圆简；超深塑料排水板；挤密砂桩；施工技术
【中图分类号】U445.4
［文献标识码］A
【文章编号】1002-8498（2015)06-0104-04
RapidIsland-formationKeyTechnologyAboutArtificial
IslandinHongKong-Zhuhai-MacaoBridge
Shen Yongxing, Li Yexun, Zhang Kui
(The Second Engineering Company of CCCC Third Harbor Engineering Co. , Ld. , Shanghai 200122,China)
Abstract: As the combination technology of large diameter steel cylinder and steel vice were successfully used in the rapid construction of east island in Hong Kong-Zhuhai-Macao Bridge, the rapid island-information technology was introduced. In the island-formation construction of east island, the large diameter steel cylinder were inserted by eight linkage hydraulic vibration hammer to impervious soil layer in seafloor, and the out contour of artificial island is formed. When the backfill sand were filled in the island body, ultradeep flashboard preloaded drainage consolidation method and sand compaction piles were used in the ground treatment of soft soil layer, and the steady island structure were formed. The success of rapid island-formation technology make the rapid prototyping, scale operation and environmental construction of artificial island in deep sea become a reality, which provide a reliable security engineering technology for offshore marine resources development.
Key words: bridges; artificial island; large diameter steel cylinder; ultradeep plastic drainage; sand compaction piles;construction
1工程概况
港珠澳大桥跨越珠江口伶仃洋海域，连接香港、珠海和澳门三地，其桥隧主体工程总长约 35.00km（其中香港界内约6.00km），大桥施工采用桥隧组合方案，隧道长5.99km，位于伶仃西和铜鼓航道处，隧道出口与桥梁相接处修建东、西人工岛衔接。港珠澳大桥东人工岛西侧与隧道衔接，东侧与桥衔接，地理位置接近香港大屿山。东人工岛岛体围护结构主要由59根直径为22.0m、厚度为 16.0mm的大直径钢圆筒及118片圆弧形副格板桩
【作者简介】沈永兴，工程师，E-mail;94715142@qq.com
【收稿日期】2014-06-20 万方数据
构成，岛体平面基本为西窄东宽的椭圆形，东西方向长约625.0m，南北方向长约215.0m，工程施工处泥面标高约－10.0m】，东人工岛的平面布置如图1 所示。图1中1~5为测点位置。
为实现在外海海洋环境下快速成岛，港珠澳大桥东人工岛施工采用大直径钢圆筒和钢副格相结合的快速成岛综合施工技术。利用8台进口 APE600型液压振动锤联动振沉系统将大直径钢圆筒简插入海底不透水土层形成人工岛体外轮脚，然后在钢圆筒及钢圆筒构成的岛体内吹填砂土形成人工岛，并运用塑料排水板联合堆载预压、水上挤密砂桩等工艺对岛体内外的软土层进行地基处理，最