The issues facing the project team on the $968 million International Arrivals Facility project at Seattle-Tacoma International Airport could hardly have been more extreme. 3D scans and animations were used to virtually sequence and insure that the install would go smoothly.
From an article in Construction Dive by Jenn Goodman.
Topping the list of challenges on the job was a middle-of-the-night installation of a 3 million-pound glass and steel walkway during driving rain while Boeing 747s landed and taxied nearby.
The 780-foot-long walkway, with 85 feet of vertical clearance and a 610-foot-long clear span between footings —enough room for wide-body aircraft to taxi underneath — was designed to connect the airport’s South Satellite building to the new International Arrivals hall.
Moving and hoisting the walkway’s 320-foot-long center section into place was a complex undertaking that required months of planning, high-tech tools and coordination among all stakeholders.
In order to optimize safety and minimize the impact to ongoing airport operations, the span was fabricated at a nearby airport cargo area. This approach enabled the team to streamline fabrication efforts, troubleshoot potential challenges and perform sensitive operations, such as the installation of the walkway’s stay cables, in a controlled environment, according to Brad McDermott, project executive at Clark Construction, the project’s design-builder.
When the massive structure was complete, Clark utilized self-propelled modular transport devices (SPMTs) operated by heavy transport consultant Mammoet to move it onto the tarmac. The specially designed hydraulic trailers can move in any direction and feature axles that telescope independently of one another to help evenly distribute weight and keep loads flat while moving over uneven terrain, McDermott told Construction Dive. Mammoet operating engineers controlled the SPMTs via remote, walking directly behind the transport during the move.
For the complete article click here.
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