Abstract
Soil conditions at a construction site for a new seven-story office building in downtown Seattle, Washington, dictated the use of an impact pile driver to set 50 to 60-ft long concrete piles into the ground, many less than 200 ft from existing offices. Exterior and interior noise measurements revealed that the pile driving activity exceeded the city's noise ordinance. A portable acoustic shield was designed, constructed, and implemented to reduce noise levels below the legal limits. Measured sound levels before and after will be presented along with details and photos of the shield in action.
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