Robbins Slurry TBM emerges from below Zhanjiang Bay - Undersea Water Tunnel nearly Operational

After advancing up to 392 m (1,290 ft) per month, Robbins’ speedy Slurry TBM made a photo finish in China’s southernmost city. The 6.26 m (20.5 ft) diameter machine broke through at the end of 2012, and the pipeline is slated to become operational in March 2013. The Zhanjiang Bay Sub-Sea Tunnel runs 56 m (185 ft) below water level, and will provide fresh water to the Guangdong Steel Plant via twin pipelines.


The 2.7 km (1.6 mi) long conduit, constructed by contractor Guangdong No. 2 Hydropower Engineering Co., Ltd, required the use of a Robbins Slurry machine to excavate under 6 bars of water pressure in Zhanjiang Bay. The TBM, supplied and assembled by Robbins with key components and engineering from Mitsubishi Heavy Industries Mechatronics Systems, Ltd. (MHI-MS), was launched in September 2011. “The cutterhead design, layout of the cutters and injection ports were the most important design factors in completing this tunnel project,” said Qinghua Shi, Chief Project Engineer for the contractor.


The high-powered Robbins machine featured a smooth flow cutterhead to allow for easier removal of stones and boulders while avoiding clogging at the face.  The mixed ground machine utilized interchangeable knife-edge bits that could be switched out for disc cutters in geology that included abrasive sand, gravel, and silt. The “smooth flow” design approach for mixed face conditions is consistent with the Robbins design for mixed face EPB-type machines.


During tunneling, the Robbins TBM excavated up to 27 m (89 ft) per day, with no interventions needed. “Throughout the project, I felt there were no significant problems that happened on the machine. I am happy that we could operate the machine properly. There were no cutters that needed to be changed, even though this was a long tunnel excavation project.The launch and breakthrough also went very smoothly,” said Shi.


Once in operation, the Zhanjiang Bay Sub-Sea Tunnel will source water from the nearby Jianjiang River to the steel plant on Dong Hai Island.  The water supply for the large company of 20,000 employees is part of a plan by the Chinese government to improve the quality and output of steel in Guangdong Province.

Related articles:

Robbins EPBs will Link up Chinese Cities

By 2010, China’s first high-speed, inter-city rail link will shorten travel times between the cities of Guangzhou and Foshan to just 40 minutes. On December 16, 2008, the first of two 6.3??m...

more
02/2014

The Robbins Company

If the tunnel-geology ranges from soft soils to weathered rock, the Robbins Company offers a solution: The Earth Pressure Balance Machine (EPBM). EPBMs are built for durability and longevity with a...

more
06/2018 Japan

Hiroshima Heavyweight launches on Expressway Line 5

On September 18, 2018, a Robbins slurry machine, measuring 13.7 m in diameter, made its first cut into hard rock

Due to the project location there were also restrictions on delivering the TBM—in order to meet controlled transportation limits within the city, the TBM had to be divided into small transportable...

more

Robbins Record Breaker TBM finishes up at Moscow’s Massive Metro

EPB sets Russian Record and Breaks Through ahead of Schedule On Friday May 24, the first of three Robbins EPBs excavating the Moscow Metro made its breakthrough. City officials and contractors were...

more

Franklin Medal for Richard Robbins

In the end of April 2009, Richard J. Robbins, President and CEO of The Robbins Company from 1958 to 1993, received the Benjamin Franklin Medal for Engineering. He is following in a long line of...

more