Hong Kong—Zhuhai—Macau sea link project, China

The Hong Kong–Zhuhai–Macau (HZM) project links Zhuhai city and Macau city on the China mainland to the city of Hong Kong across the Ling'ding Ocean near the southeastern coast of China. The project consists of 26 km of sea bridges, two offshore artificial islands and an immersed tube tunnel of 6.8 km, with a design working life of 120 years. This chapter introduces first the general layout and structural elements of the project, and then it focuses on the durability design of the concrete structures for the 120-year design life, and the subsequent quality control in construction. On the basis of the collected data, a durability assessment is performed on the concrete elements for the achieved durability level. The strategy of life-cycle management of concrete structures is elaborated through the inspection/monitoring scheme, the maintenance planning and the real-time durability assessment.