World’s largest pile-driving ship departs China for Brazilian bridge project

In the churning, deep waters of the Bay of All Saints, conventional construction equipment doesn’t stand a chance.

Recently, the “world’s largest” custom-built pile-driving ship left Lyusi Port in Nantong, Jiangsu province, and is heading for Brazil’s All Saints Bay. It set off on an ambitious 45-day journey across two oceans.

It will help build Latin America’s largest cable-stayed cross-sea bridge: the Salvador-Itaparica Bridge. Notably, the bridge will span the country’s largest bay and involves pile foundation work in waters up to 64 meters (nearly 210 feet) deep.

Pile-driving ships are specialized marine construction vessels that hammer or press large vertical foundation piles deep into a seabed or riverbed. These foundation piles act as underwater stilts, anchoring and supporting heavy offshore infrastructure. Typical applications include supporting cross-sea bridges, wind turbines, oil platforms, and harbor docks.

Built for the extremes

The engineering challenge is huge. Constructing a 12.4-kilometer ( 7.7-mile) cross-sea span over deep waters and chaotic seabed geology requires unprecedented muscle. To tackle the job, China Railway Construction Bridge Engineering Bureau Group (CRBG) built a vessel designed to push the absolute limits of marine construction.

“Complex ocean geology, strong currents and variable wave conditions have long made the site a major engineering challenge,” Song Jian, the vessel’s construction director at CRBG, told China Daily.

Reports suggest the pile-driving ship features a 156-meter (511 feet) pile frame, making it the tallest in the world. It delivers a world-record lifting capacity of up to 700 tonnes ( approx. 771 US tons) for steel and concrete in a single maneuver. The vessel also holds the world record for operating depth, capable of driving foundations into ocean floors up to 70 meters (approx. 230 feet) underwater.

Holding a ship steady while pounding massive pillars into a shifting seabed is a brutal operational hurdle. To overcome it, the vessel pairs anchor mooring with state-of-the-art dynamic positioning. Onboard sensors continuously track wind, waves, currents, and ship orientation in real time, automatically firing thrusters to micro-adjust and keep the giant frozen in place.

Enhancing regional transport

This vessel is also a major milestone in marine construction technology as the first pile driver equipped with a closed-loop main cylinder hydraulic system.

According to Song, this system captures the energy naturally generated whenever the massive pile frame lowers or tilts, converting that potential energy into recyclable electricity.

Through this innovative mechanism, the vessel achieves an energy recovery rate of 40 percent, dramatically improving operational efficiency while reducing waste during heavy-duty offshore operations.

Its route is equally daunting. The vessel will navigate south through the narrow Strait of Malacca, round the turbulent waters of the Cape of Good Hope, and traverse the open expanse of the South Atlantic before dropping anchor off Bahia’s coast.

When the bridge finally opens, daily life in the region will transform overnight.

Commuters traveling between Bahia’s capital of Salvador and Vera Cruz on Itaparica Island currently face an hour-long ferry ride. The new road link will slice that trip to a quick 15-minute drive. For producers in western Bahia, the link promises faster, cheaper transit for vital agricultural goods, unlocking a new economic artery for northeastern Brazil.

Source: https://interestingengineering.com/innovation/largest-pile-driving-ship-brazil