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March 21, 2013

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Metro uses water to lower cave-in risk

BUILDERS of the city's Metro system are pumping back groundwater at a project site for the first time to avoid dangerous cave-ins of land in the area.

While the back-pumping is often used in building construction, it is being used for the first time at a 33-meter-deep excavation on Metro Line 13's Hanzhong Road construction site, the deepest Metro excavation in Shanghai.

"It would be a great danger if subsidence happened here in downtown," said Zhu Yanfei, the general engineer with Shanghai Tunnel Co. Zhu said many high buildings are located around the site.

The engineer said about 1.6 tons of underground water, or 42 percent of the total water pumped out, has been recharged after 97 days of construction, meeting subsidence prevention standards.

The rest of water will be recycled later or used for clean-up.

For a long time, the city has been beset by problems due to soft soil and a growing number of construction projects, including work on some landmarks like the new Shanghai Tower, which left nearby pipelines in danger.

Jiang Shujie, deputy director of Shanghai's construction and transport commission, said the subsidence problem "is a big one, involving many aspects like geology and construction work as well."

Shanghai is setting up ground subsidence alert standards soon to allow preventative measures.

Also, an Internet post that spread yesterday about a cave-in on a ramp of the Dabaishu section of the Inner Ring Road in Yangpu District was only road renovation work that was finished in the afternoon, according to authorities.


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