Mega piling ship heads for bridge in Brazil

The voyage of CRCC Bridge Piling No 1 heading to Brazil marks a key step for China's high-end marine engineering equipment sector as it expands its presence in deeper and more distant foreign waters, experts said.

The vessel, the largest of its kind globally, departed Lyusi Port in Nantong, Jiangsu province, on Sunday, bound for Brazil's All Saints Bay (Baia de Todos os Santos) to construct Latin America's largest cable-stayed cross-sea bridge.

The vessel will support construction of the Salvador-Itaparica Bridge, which spans Brazil's largest bay and requires pile foundation works in waters 64 meters deep.

"Complex ocean geology, strong currents and variable wave conditions have long made the site a major engineering challenge," said Song Jian, the vessel's construction director at China Railway Construction Bridge Engineering Bureau Group (CRBG).

Conventional global pile-driving vessels typically feature 80-meter pile frames, hundred-ton lifting capacity and decimeter-level positioning accuracy, with limited resistance to strong offshore winds — leaving them unfit for the depth and conditions in All Saints Bay.

The 130.5-meter CRCC Bridge Piling No 1 has a 156-meter pile frame and a 700-ton lifting capacity, with a maximum operational water depth of 70 meters, making it the most capable vessel of its kind in the world.

At its core is the world's largest luffing hydraulic cylinder, entirely domestically designed and manufactured.

"Technically, the vessel achieves two global firsts," Song said. "We are the first to apply an integrated dynamic positioning and anchor-mooring positioning system on a large pile-driving vessel. Combined with China's domestically developed BeiDou high-precision satellite navigation system, it delivers centimeter-level pile-driving accuracy."

The vessel is also the first to equip a pile-driving vessel with a closed-loop main cylinder hydraulic system, which converts potential energy generated when the pile frame lowers or tilts into recyclable electricity, with an energy recovery rate of 40 percent, Song said.

"For decades, deepwater pile-driving technology was dominated by European and US companies. This vessel represents a decisive shift from China following the pack to leading the global deep-sea construction equipment sector," said Du Zunfeng, professor and associate dean of the School of Civil Engineering, Tianjin University, an expert in marine equipment safety and industrial strategy.

Unlike older manually operated vessels, it delivers centimeter-level accuracy — representing an order of magnitude improvement over the traditional decimeter standard under deep-sea conditions — and supports one-click automated operation from positioning to pile installation.

The closed-loop hydraulic system automatically switches between consumption and regeneration modes. It also reduces hydraulic tank volume by 13 percent and deck footprint by 22 percent, while reducing operating noise levels. Fitted with a selective catalytic reduction (SCR) exhaust treatment system, the vessel meets the strictest IMO (International Maritime Organization) Tier III emission standards and can operate in all global emission control zones.

The Salvador-Itaparica Bridge is being delivered under a concession-based PPP model by a Sino-Brazilian joint venture including CRBG. With a main span of 682 meters and a total route length of 46.8 kilometers, the bridge will cut travel time between Salvador and Itaparica from one hour by ferry to roughly 15 minutes, and shorten freight routes for grain, cotton and tropical fruit from Western Bahia state by 200 km.

Rather than being a standalone equipment export, the vessel is sailing as part of an integrated engineering and equipment package — a model Du said adds long-term value to China's marine equipment sector.

"When equipment travels alongside a contractor's own overseas projects, it is tailored to real site conditions and delivers far better performance than generic off-the-shelf products. This approach is moving China from a product exporter to a full deep-sea solutions provider," he added.