A few weeks ago I wrote about the progress of the new Stinson Municipal Airport Control Tower. As the main portion of the tower was going up the "cab" - the uppermost part with all the windows where the air traffic controllers actually do all their work - was simultaneously being built on the ground. Last week a large crane lifted it to its final resting place on top of the tower.
This is not how buildings are normally built. Then again an air traffic control tower is not a normal type of building. When you think about it, this approach makes sense. Since the cab contains the majority of the detail work associated with the project you want to build it in the most efficient way possible. Forcing every sub-contractors to climb ten flights of stairs to do all their work a hundred feet in the air isn't very efficient. Hoisting a massive pre-built component may seem like an extreme approach but it turns out to be the best one. AJT, the engineering firm responsible for the main portion of the tower, has perfected this approach having built several multiple versions of the same tower over the years.
Design is about the finished product to be sure, but it is also about how you get there. Strategizing how the "wings" - our contribution to the design - are prebuilt and attached to the tower represented a significant portion of our design as well.