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RE: Slab on grade[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Slab on grade
- From: "Paul Feather" <PFeather(--nospam--at)se-solutions.net>
- Date: Mon, 10 Nov 2008 10:44:06 -0800
Dobies are typically used in SOG construction, not elevated slabs. Bolsters is another term for chairs. In elevated construction chairs are used to secure reinforcing steel that serves as the support for the other specified reinforcing steel. When the chair becomes so short it is just a strip on the bottom of the form for reinforcing clearance, the correct term is bolster.
The distinction is important in some regards, particularly in review of PT layout and profiles. The offset for the PT CGS is different for a chair than a bolster, by the diameter of the intermediate bar.
The terminology is frequently inter-mixed and not used in the true sense. Chairs used to be actual four legged wire stands with plastic coated feet, but most often today the entire chair is plastic.
Paul Feather PE, SE
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