On July 12, the final panel of the west anchorage diaphragm wall of the Lingdingyang Bridge of the Shenzhen-Zhongshan Link was successfully concreted, marking the full transition of the west anchorage to the cap beam lining and foundation pit excavation stage, laying a solid foundation for the solid anchorage construction.

The Lingdingyang Bridge anchorage is currently the world's largest sea anchorage, with an area equivalent to 17 basketball courts. The anchorage foundation of the Lingdingyang Bridge adopts a figure-eight diaphragm wall enclosure structure, divided into 79 panels, including 2 special 'Y'-shaped panels. The maximum wall depth of the west anchorage diaphragm wall is 52.5 meters, and the total concrete volume for the diaphragm wall is approximately 26,000 cubic meters.

During the construction of the west anchorage diaphragm wall, facing the difficulty of no reference experience for ultra-large sea anchorage construction, the project team based on innovation pioneered the geotextile tube cofferdam construction technology and successfully applied it on site. At the same time, combined with the geological characteristics of the west anchorage construction area, the 'drilling and milling method' was optimized to the 'drilling, grabbing and milling method', adopting the alternating construction technology of 'rotary drilling rig + trenching machine + trench milling machine' equipment, greatly improving the quality and efficiency of trenching. During this period, a construction speed of completing one panel in two days was achieved, ensuring the milling safety and trenching accuracy of the two special 'Y'-shaped panels.

The project fully promoted the resumption of work and production, prioritizing the organization of industrial workers from low-risk areas to return to work by chartered buses, bringing back more than 200 industrial workers from Sichuan, conducting nucleic acid screening tests for more than 300 frontline workers, and immediately carrying out epidemic prevention education and safety technical briefings for returning employees, effectively reducing the impact of the epidemic on production and recovering construction time.

Kuang Yicheng, deputy manager of the Poly Changda Lingdingyang Bridge Project, stated that during the peak construction period, the number of workers for the west anchorage diaphragm wall of the Lingdingyang Bridge reached 228, with 26 various types of machinery and equipment invested, and the concrete mixing station supplied continuously 24 hours a day, ensuring the accelerated progress of important processes.

At present, the construction of the Shenzhen-Zhongshan Link project is progressing smoothly. The construction of the west main tower column of the Lingdingyang Bridge has been fully launched, with the sixth segment of the left column and the fourth segment of the right column completed. The bottom sealing concrete pouring of the lower crossbeam water-stop box has been completed; the right foundation pit of the west anchorage has entered the process conversion ahead of schedule and is undergoing cap beam construction; the west approach bridge has completed 10 pile caps and a total of 276.9 meters of pier shaft construction.