New chemical, advanced drill used to crack Manhattan rock

10/20/2008 | Associated Construction Publications

A new chemical rock-splitting mortar called Da-mite has been used to crack a rock up to 35 feet below the surface of New York City. Once the chemical is poured into a hole, 20,000 psi of pressure can build up after a day. The hundreds of 2-1/2-inch holes needed to hold the chemical were made using an ECM-590 drill from Atlas Copco to drill all the holes necessary for excavation. The same drill was used to create four-inch holes eight inches apart along the foundation.

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