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October 6, 2017
One of the largest concrete mat pours in Seattle history took place over 23 hours last weekend for Skanska's 2+U office tower at Second Avenue and University Street.
Crews started at 2 a.m. Saturday. When they were done, they had placed 11,000 cubic yards of concrete into the hole, which was 50 to 80 feet deep on the sloped site.
The 40,000-square-foot mat foundation is 12 feet thick and fortified with 2.8 million pounds of rebar.
The operation required 140 craft workers, 1,100 mixer loads of concrete, six pumper trucks and 14 traffic cops controlling nine downtown intersections.
Cadman supplied the concrete and Brundage-Bone Concrete Pumping provided the pumper trucks. Others involved were MKA, Mayes Testing, National Barricade, McKinstry, Valley Electric, Gerdau and the Seattle Department of Transportation.
When 2+U opens in 2019, it will have 665,000 square feet of office space in 38 stories above a 24,000-square-foot outdoor urban village that includes arts and entertainment spaces, restaurants and retail.
The first level of office space will be 85 feet above the ground to accommodate the village.
Office floor plates will be 30,000 square feet on the lower levels and 18,000 square feet on the upper levels.
Amenities will include a 19th floor outdoor deck, event spaces, a bike club, and a fitness and wellness studio.
A video of the mat pour is at www.instagram.com/p/BZ35Q_UjThr/.
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