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Spiral stirrups are stirrups commonly used in Bored Pile Foundations. In the manufacture of these stirrups using a roller. Roller is a tool for rolling distance spiral reinforcement / spiral stirrups. Usually used for spirals is plain reinforcement because this reinforcing steel has elastic properties.
The diameter of the roller is made smaller than the diameter of the bored pile so that a blanket/concrete cover with a thickness of about 5 - 7.5 cm is obtained. For cutting and bending reinforcing steel commonly used cutting machines or conventional reinforcing shears. To bind the reinforcing steel, concrete wire is used using a gegep tool or pliers.