To meet project needs, Brewer’s design called for eight scaffolding towers – a couple for each wing – in two setups to accommodate different portions of the work.
In the initial setup, each scaffolding tower provided a platform, approximately 10 ft by 8 ft, every 6.5 ft along the building façade. Contractors would use it to break out the brick.
In phase two, interior guardrails were attached to side bays to create working decks from which to build and weld a steel frame to support the shaft. First, workers removed the masonry, then a steel contractor fabricated and attached frames to existing steel along the building facade. With the steel framework in place, center bay decking was removed to accommodate the vertical installation of piping, duct work, and other vitals.
Towers were designed using the Layher Stringer 200 series stairs, the Layher Allround®, and diagonal bracing. A series of 30 Layher stair stringers made up each stair unit. Brewer has used Layher products exclusively since 2012.
For a proof of concept, Brewer set up a two-rise prototype for trades to come try out. “It was a balancing act to make sure everything was fitting within the open bay,” said Tom Brewer, “close enough to do the work, but not too close.”