The Xihoumen Highway and Railway Bridge in East China"s Zhejiang Province marked phased progress when 18 drill piles belonging to pier No 5 of the bridge, each with a diameter of 6.3 meters - the world's largest - were injected with cement on Sunday, state broadcaster CCTV reported.

The final cement injection was completed on Sunday, according to CCTV.

Since drilling work began in July last year, workers overcame technological challenges in the construction of the drill piles, which have the world's largest diameter, measuring 84 meters in length, of which a 37-meter-section is plunged firmly into bedrock beneath choppy water at a maximum depth of 60 meters in the area.

The completion of the cement injection at pier No 5 was completed ahead of schedule, according to the report.

The Xihoumen Highway and Railway Bridge, dubbed the world's longest super sea-crossing bridge with a total length of 3,118 meters, and connecting Zhoushan's Jintang and Cezi islands, is among a total of 10 landmark projects Zhejiang Province is undertaking to boost regional connectivity.

The bridge will allow trains travel at speeds of up to 250 kilometers per hour and will link up with Zhoushan, Zhejiang's last city not connected by rail.

The bridge has a main span of 1,488 meters. Its width, at 68 meters, is also the world's widest for a dual-purpose sea bridge.

As China rings in 2024 with a bang, a number of Chinese localities including East China's Anhui and Central China's Hunan provinces have launched a new round of major projects, reflecting a robust start to the new year, which Chinese experts describes as an encouraging sign for economic growth.