Progress > September 2007
The Big Pour
On September 19th the Kroon construction team reached a much-anticipated milestone – the first big pour of concrete. In a single day, five trucks worth of concrete were spread to form the foot-thick slab that stretches along 40% of the basement level floor.
While this is only one of twenty large placements of concrete, it was a critical one. According to Chris Meyer, construction manager for the Kroon project, this first big pour was also likely to be the hardest. He emphasized that the construction process for a unique, innovative building like Kroon Hall is a learning process: there are some things that they only figure out as the materials come together at the full-scale, in real-world conditions. As a result, they have used these early steps to test the smoothness of the surface of the cured concrete and other building characteristics.
While progress on Kroon has steadily taken place over the past year, thus far it has largely been unseen by people passing by the building site, with the work deep in the hole or behind the scenes in the old boiler plant. But that is about to change. Over the next few months the entire superstructure will rise up on the spot.
Each level of the building is divided in two parts, with the basement level split into the eastern 40% and western 60%. While one team was prepping for the big slab on the eastern side of the building, another team has been prepping and pouring the vertical elements that will support the second portion of the basement slab. As soon as the first slab had cured, the vertical support team began placing the concrete forms and rebar for the basement level walls in the eastern end of Kroon. The slab team then shifted to the western side where they will pour the 60% slab in early October.
Each of these teams will take about three weeks to place the concrete forms, rebar, and pour the concrete. In this way, Kroon will rise with staggered steps, vertical and horizontal work taking place simultaneously. The line where the eastern and western sections meet will also slide back and forth with each level, the location being determined by the room configuration and wall placement on each floor.
Meyer noted that working with specialized teams like this makes the construction process much more efficient. For the casual passerby on Prospect Street or through Sachem's Wood, that efficiency will soon be obvious, as the skeleton of Kroon rapidly rises in the space of a semester.
Photographs by Peter Otis
Edward P. Bass
Susan & Coleman P. Burke
Michael F. O. Harris Family
Carl W. Knobloch, Jr.
Mary Jane & Richard E. Kroon
Evelyn and Bonnie Lee
Diana Calthorpe & Jonathan F. P. Rose
Joan O. L. Tweedy
William D. Waxter III
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