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In October 2012 crews install underground steel supports to protect the Polson Building. These supports create a physical barrier to limit settlement during boring of the SR 99 tunnel, so the adjacent building is not affected. This technique was used to protect Antonio Gaudi’s Holy Family Church (La Sagrada Familia), a world heritage monument in Barcelona, during a similar tunnel project. Learn more about the program at www.alaskanwayviaduct.org.

Installing micropile walls

Fri, Nov 9, midnight 2012

by WSDOT

In October 2012 crews install underground steel supports to protect the Polson Building. These supports create a physical barrier to limit settlement during boring of the SR 99 tunnel, so the adjacent building is not affected. This technique was used to protect Antonio Gaudi’s Holy Family Church (La Sagrada Familia), a world heritage monument in Barcelona, during a similar tunnel project. Learn more about the program at www.alaskanwayviaduct.org.

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