CFA Awards
Entry #3
Category: Single Family over 5,000 square feet
Size:
Total Square Feet: 11,854 sqft
Footings:
Total Concrete: 1,050 yds
Total Steel: 126,545 lbs
Walls:
Total Concrete: 501 yds
Total Steel: 256,210 lbs
Heights: 25’-0” (some up to 54’-0”)
Thickness: 10” to 1’-6“
I-Beams: 47 - 49’-0” long x 27” x 278” = 640,234 lbs
Significant Footing Details:
The footing was actually a mat slab ranging from 4’-0” to 4’-6” thick with 3 key ways below that 3’ x 3’ x 50’ long. We used approximately 560 yards with an additional topping slab 6” thick.
Outstanding Features:
The wall layout was difficult because there was only four square corners and the rest were acute and obtuse angles with intersecting interior walls at off angles. These were several columns going up 30’-40’ and the walls were 1’-6” to 1’-0” thick.
Describe the project:
This basement should be selected because of its size and complexity. From the bottom up to Grade level, we encountered mass quantities of rebar and concrete. We also had so many different phases to the basement with a wide variety of equipment and forming situations.
At first we had a Lo- Drill and Soil Mec to drill to 40’-60’ deep caissons. Where we encountered blue andesite rock which slowed the drilling down to 8’-10’ per day. We also encountered mass amounts of ground water. The site took several months to excavate. The mat slab and keyways had to be encased in waterproofing below and up the walls - the keyways due to logistics of the housing community.
We had to use a boom pump for pouring concrete. We had three structural decks above the mat slab we had to pour, and a pan deck we had to pour above the mat slab to create a crawl space to get to grade level. In addition, as I mentioned before there were few square corners or parallel walls. Most intersection of walls were acute or obtuse. From starting drilling to reaching ground level above, over 1 ½ years had elapsed.
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