Marine Construction Sharp Tools Like Walking On A Flat Ground

Marine construction "sharp tools" like walking on a flat ground

In June this year, the world's super project Shenzhen-China Corridor opened to traffic, becoming an important link for the integrated development of the Guangdong-Hong Kong-Macao Greater Bay Area.

As the longest and largest section of the whole line, the S06 section of the Shenzhong Channel of the Second Public Bureau of China Communications has 822 large-diameter offshore pile foundations, 141 deep foundation pit cofferdams, 137 high pier pillars, 124 large-volume concrete cover beams, and thousands of tons of steel and 5,000 tons of concrete are transported every day during the construction peak period. The difficulty goes without saying.

How do materials, equipment and personnel "stand" on the cross-sea bridge? Combined with the actual site, the project team set up a steel trestle of about 8 kilometers in length on the sea close to the bridge location, transforming the offshore construction into land construction, reducing construction safety risks and improving transportation efficiency.

How did such a long steel trestle take root in the deep sea? In terms of durability and stability design, the highest standards are used, the steel pipe piles are treated with anti-corrosion coating before leaving the factory, the bridge adopts galvanized military beret, and the section steel rear field is centralized sprayed with anti-rust paint, which can not only meet the stability needs, but also avoid steel corrosion to the greatest extent and increase the durability of the steel trestle.

According to reports, each section of steel trestle design span of 15 meters, 9 meters wide, steel pipe pile foundation first through the plate barge to transport to the site, the use of piling ship inserted. Depending on the geological situation, the length of the pipe varies from 42 to 56 meters.

Not only that, the project also innovatively adopts the modular design of the prefabricated drilling platform, replacing the previous "section steel + Bailey" platform. The modular design of the steel trestle and drilling platform, coupled with the rotary drilling process, has enabled the smooth development of offshore construction, making the double-tower cable-stayed bridge of Zhongshan Bridge a bright landmark of the deep-middle passage.