Rotatable Concrete Spacer
Our patented Rotatable Concrete Spacer (US Patent #D373,070) solves many issues associated with the proper installation of reinforcing steel, placed in concrete beams and drilled shafts. One such issue is the proper clearance required between the reinforcing bars and the sides of forms or drilled shafts. Another is the proper alignment or positioning of the reinforcement, which is crucial for structural compliance. Lastly, the use of plastic spacers can have material incompatibility with the concrete.
Today, the standard practice for ensuring proper clearance requirements for the side and bottom of forms is to use two individual concrete spacers (Dobies), each significantly contacting the form along one of their sides (full area of the Dobie). The unique design of our Rotatable Concrete Spacer allows for proper clearance of the reinforcing bars from a side and bottom form by using only one spacer with minimal contact between the spacer and the form walls.
The Rotatable Concrete Spacer is attached to the main reinforcing bars, as opposed to a Dobie which connects to the reinforcing ties, therefore allowing for greater load capacities. The semi-round design also allows the placed reinforcing steel cage in a form or drilled shaft to be rotated into proper position without disturbing the sidewalls of the shaft.
Another common type of concrete spacer is made of plastic. Plastic spacers do NOT bond to concrete, and will, therefore, create weakened areas in the finished product. Furthermore, plastic spacers that do not bond to concrete can allow shrinkage cracks in the finished product, leading to deleterious effects in the hardened concrete and could cause corrosion and damage to the reinforcing steel. Our Rotatable Concrete Spacer is made of high strength concrete or can be fabricated on site using the special concrete design mix as specified for the project. The Rotatable Concrete Spacer will bond to the newly placed concrete, and assure homogeneity within the structure.
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