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The company co-authored the newly compiled standard “Technical Specification for Anti-Corrosion Protection of the External Surface of Steel Shells in Immersed Tunnel Sections,” which has now been officially promulgated and implemented.
Date:
2023-01-16
The Chinese Society for Corrosion and Protection standard T/CSCP 0007-2022, “Technical Specification for Anti-Corrosion Protection of the External Surface of Steel Liners in Immersed Tunnel Structures,” jointly compiled by Qingdao Shuangrui Marine Environmental Engineering Co., Ltd. as the lead editor and with the participation of Dalian Kemaier Anti-Corrosion Technology Co., Ltd., Dalian University of Technology, and other organizations, has been officially promulgated and put into effect.
T/CSCP 0007-2022 The Technical Specification for Corrosion Protection of the External Surface of Steel Shells in Immersed Tube Tunnels is China’s first technical standard specifically addressing the durability and protection technologies for the external steel shell of steel-shelled concrete immersed tube tunnels. It sets forth life-cycle technical requirements covering the design, construction, acceptance inspection, and maintenance management of anti-corrosion coatings and cathodic protection systems for the external steel shell, thereby providing systematic and comprehensive theoretical support and technical guidance for ensuring the durability of steel-shelled immersed tube tunnels in China. This specification fills a critical technological gap in the field of steel-shelled concrete immersed tube tunnel construction in China and represents one of the key outcomes of the Shenzhen–Zhongshan Link project, a major national initiative under the 13th and 14th Five-Year Plans.
As one of the earliest domestic organizations to undertake research and development on monitoring technologies and equipment for cathodic protection of the external walls of steel–concrete immersed tunnels in complex, deeply buried marine environments characterized by coupled seawater–seabed mud–rock fill, the company has, leveraging the construction of the steel–concrete immersed tunnel section of the Shenzhen–Zhuhai Link project, successively developed a floating-type cathodic protection potential monitoring system for steel-shell immersed tunnels, an in-situ, pressurized-replacement capable monitoring sensor for steel-shell immersed tunnels, and a non-destructive, integrated installation method for the tunnel bottom surface. These innovations have been subjected to long-term, full-scale offshore monitoring trials on the physical tunnel segments of the Shenzhen–Zhuhai Link project, thereby facilitating and securing approval for their application in the project’s actual engineering works.
The Shenzhen–Zhongshan Passage is a large-scale, integrated cross-sea project that combines an ultra-long-span bridge, an exceptionally long, eight-lane双向 submerged-tube tunnel, an artificial island in the sea, and an underwater interchange. It is another world-renowned, century-defining engineering marvel following the Hong Kong–Zhuhai–Macao Bridge. The subsea tunnel of the Shenzhen–Zhongshan Passage spans approximately 6.8 kilometers, with the immersed-tube section measuring about 5 kilometers and comprising 32 tunnel segments and one final joint. It is China’s first steel-shell–concrete immersed-tube tunnel, the largest such tunnel in the world, and the country’s first project to mandate a service life of at least 100 years for its steel structure in a marine environment. The steel-shell–concrete immersed-tube tunnel of the Shenzhen–Zhongshan Passage is deeply buried at the mouth of the Lingdingyang Estuary, passing through multiple complex geological strata and operating in a coupled medium of seawater, marine mud, and riprap, where corrosive agents and environmental conditions are highly variable and intricate. Once backfilling is complete, it becomes virtually impossible to inspect or maintain the external corrosion of the steel shell. For steel-shell–concrete immersed-tube tunnels designed for a service life of 100 years or more, corrosion protection of the steel shell’s outer surface is a critical technology for ensuring the structure’s durability.
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