深圳至中山跨江通道是国家高速公路网G2518 跨越珠江口的关键性工程,通过多方案比选,确定了桥、岛、隧组合的设计方案。项目线路全长约24 km,按双向8 车道高速公路设计;其中,线路长度为6 845 m 的水下隧道采用沉管法建造技术。通过试验研究和分析论证,确定矩形钢壳混凝土组合结构、先铺法基础碎石垫层、水下深层水泥搅拌桩的基础处理等关键技术的技术要求和施工工艺,并研发管节浮运安装一体船等施工专用设备。

Shenzhen-Zhongshan Crossing-river Link ( Shen-Zhong Link) is the key project in G2518 of National Expressway Network, across the Pearl River Estuary. Shen-Zhong Link is a mega project integrating bridges, artificial islands, tunnel, and underwater interchanges, which is built according to the standard for bi-direction eight-lane expressways. The total length of the project is 24 km, of which the tunnel is 6 845 m long, constructed by immersed tube method. Through experimental researches, analysis and demonstration, the technological requirements and construction process for the steel-concrete-steel composite structure of the rectangular immersed tube, the pre-laid gravel cushion and the underwater deep cement mixing (DCM) pile foundation treatment. In addition, a series of special construction equipment, such as the self-propelled huge barge integrated with the floating, towing, immersion and installation functions is developed.