When the bond is prestressed concrete, the concrete is poured first, and when the concrete reaches more than 75% of the design strength, the steel bars are stretched (bundles) . The main tensioning procedures are as follows: embedding pipe hole → pouring concrete → drawing pipe → stretching of reinforcing steel bar for maintenance → anchoring → grouting (to prevent reinforcement from rusting) and treatment of anchor head, prestressing the Cross section of concrete, which binds the steel bar to the concrete as a whole, is called prestressed concrete. There is a bond prestressed concrete due to the bond force (resistance) of the role of prestressed steel tensile stress reduction, resulting in concrete compression stress reduction, so we should try to reduce this bond. This method is simple in equipment, no need of pedestal, flexible in production, and suitable for large-scale construction.
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