San Francisco, California
At the end of 2013 KB International assisted Malcolm Drilling on the deep foundation shafts for the 181 Fremont Street project in downtown San Francisco. 181 Fremont Street will become the second tallest building in San Francisco. Malcolm drilled 44, 5 to 6 foot diameter piles to an average depth of 262 feet; breaking the record for the deepest foundation shafts in the Bay area. The financial district sits on what was once Yerba Buena Cove which served as a landing point for ships during the Gold Rush. Many ships were abandoned in the cove and it was eventually filled in. Malcolm excavated through this difficult fill and 30 feet into the challenging Franciscan formation. Malcolm Drilling elected to use polymer due to the superior skin friction achieved and selected KB as a result of their service on previous projects. KB’s engineers designed a polymer system specifically for the project in which the necessary properties could be achieved under such unpredictable and challenging soil formations.
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