The company has always focused on the research and application of large-diameter single pile construction technology without transition section, and has successfully promoted this technology from the intertidal zone to the offshore area. The operating water depth covers the mud surface elevation from +1m to -50m, and the pile driving diameter ranges from 4.3m to 8.8m. The verticality of more than 80% of the single piles is controlled within 1‰, which is far lower than the design requirement of 3‰ verticality. Relying on strong equipment and technical support, the company adopts two sets of foundation pile driving technologies: the traditional "jack-up lifting platform + double-layer pile holder pile driving technology" and the independently designed and developed "pile stabilizing platform technology", and its construction business covers the sea areas of Jiangsu, Fujian, Guangdong, Liaoning and other provinces.