Derrick does the job: Using a derrick to take down a Liebherr tower crane avoided the need for Sellen Construction to close busy Seattle streets

摘要

After constructing the 36-storey 1918 Eighth Avenue office tower in downtown Seattle, Washington, commercial general contractor Sellen Construction needed to take down a Liebherr 355 HC-L. Because of the tower crane's close proximity to the building, it couldn't lower itself down. The company hired a Liebherr 200 DR 5/10 to dismantle the crane and finish work on the roof. While deciding to use the derrick, Sellen also looked into erecting a large mobile crane to take down the 355 HC-L.