At 21:30 on August 4, after about 60 hours of continuous work, the roof slab of Section 11 (No. YZD9-2) of the cofferdam-built section of the Shenzhen-Zhongshan Link East Artificial Island completed a super-large-volume concrete pour. The pour volume was nearly 4,000 cubic meters, making it the largest single concrete pour at the Shenzhen-Zhongshan Link East Artificial Island.

The Shenzhen-Zhongshan Link East Artificial Island is China's first underwater interchange. The main-line cofferdam-built tunnel project is located on the west side of the East Artificial Island and connects with the project's immersed tube tunnel, and is divided into 26 structural sections for construction. The roof slab poured this time has a span of 68.8 meters, a slab thickness of 2.7 meters and a length of 19 meters. The total amount of rebar reaches 1,000 tonnes, and the concrete pour volume is nearly 4,000 cubic meters and must be completed in a single pour. It features many types of rebar, heavy individual rebars, difficult erection of the stiff skeleton, and high crack-control requirements for high-performance marine concrete, making construction highly difficult.

Because the cofferdam-built tunnel project will remain in the high-temperature, high-humidity and high-salinity environment of the sea area for a long time after completion, extremely high requirements are placed on the quality of mass concrete pouring. Crack control in mass concrete is a major difficulty. The contractor adopted measures such as installing chillers at the material yard, laying double-layer cooling water pipes and ice water inside the structure, and film-covered water-retaining curing, to strictly control the concrete temperature.

At 21:30 on August 4, the project department successfully completed the concrete pour of the roof slab of Section 11 (No. YZD9-2) of the cofferdam-built section of the Shenzhen-Zhongshan Link East Artificial Island, building momentum for the "accelerated sprint" in the final stage of main structure construction of the East Artificial Island cofferdam-built section.
The Shenzhen-Zhongshan Link is the only direct highway connection between the two major city clusters of the Pearl River Delta, "Shenzhen-Dongguan-Huizhou" and "Zhuhai-Zhongshan-Jiangmen." After completion and opening to traffic, it will shorten the drive from Shenzhen to Zhongshan from 2 hours to 20 minutes, which is of great significance for accelerating the revitalization and development of eastern and western Guangdong and promoting the integrated development of the Guangdong-Hong Kong-Macao Greater Bay Area city cluster.

To control all aspects of construction and advance the implementation of key milestones, the project linked Party member responsibility areas with project quality improvement. Through methods such as standardized construction briefings, technical disclosures, expert demonstrations, and formulating management rules for mass concrete quality improvement, it provided technical support for pouring a super-large volume of concrete in a single formwork pour.