3.1 BRD CONSTRUCTION IN GENERALA. The BRD engineering method is one of the top-down engineering methods for the underground reinforced concrete structures. With this engineering method, the underground reinforced concrete slab is top-down constructed without an extra supporting post installed. Namely, a bracket will be installed onto the steel frame column, and then, form frame and formwork will be installed for the bracket for concrete work. Bracket and form frame will be removed down using a torsion bar after the concrete has been cured.
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