Posted Apr 28, 2023, 12:58 AM
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Join Date: Jan 2014
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Right, void of rebar, not of concrete. Tensile void.
Quote:
Originally Posted by Marshal
Forgive me if I am over-explaining, but:
There are two kinds of voids in poured concrete construction. One where no material is required (there is no structural requirement). These can be formed in the standard way, such that when the pour is complete the void includes the wood formwork which is trapped and air, or by other methods, for example, a hard foam shape used to form the void, which is then trapped by the pour and becomes what constitutes the void. It depends on what the engineer is doing at that location, and/or what is cheaper overall (with regard to material and labour costs for construction). A second version is a tensile void. This seems to be the case with Vancouver House. They need a large mass, so they want to fill that whole area. But, there is no need for reinforcing steel in the central part of the volume. So they are using the scaffolding to support the rebar placement above the void until the concrete is added. Once the concrete is in place, the scaffolding is dumbly trapped within but serves no purpose any longer. The end product is a large volume of concrete with an 'empty' box of rebar inside it.
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Last edited by madog222; Apr 28, 2023 at 5:22 AM.
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