CFA Awards
Entry #11
Category: Commercial/Multi-family
Size:
Piers & Walls Concrete: 1,097 yds
Footing Concrete: 503 yds
Wall Steel: 107 tons
Heights: 11’6”, 12’, 14’, 24’, 27’ and 30’
Thickness: 12”, 16”, 18”, 20” and 22”
Nature of the Project:
To construct footings, piers, retaining walls and a cluster of six (6) bins for underground aggregate storage.
Special Materials or Processes Used:
Concrete was 4000 and 4500 BL with some mixed having 50% slag. Slag was used to give the concrete a more durable wear surface. The slag, however, acts as a natural retarder and posed some pouring concerns on the higher wall pours.
Additional Project Details:
The project started in July with a series of Conveyer footings and piers. After the rock Excavation and footings were backfilled and Compacted, we started the
footings for the 6 bins and the retaining walls for the
conveyer pit. The retaining walls were 24 and 27' in
height, but relatively easy.
The vault (bin cluster) was much more involved and labor intensive. The exterior walls and the poured beams (32" x 48" beam) on the first level were poured monolithically to a height of 12’. A 6" angle iron was placed around the Inside of all 6 bins. The next level of pour was 11’6” and the interior walls were stepped in 6" to receive the steel bin hoppers. At the top of the 11’6” pour we placed a 4" angle to support the steel grating (grizzley) to support dump trucks. The 3rd and final lift was 42”.
To
date the piers, conveyor retaining walls and vault are
complete. Projected finish date for phase 1 will be mid-December.
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