Prestressed anchors commonly used methods of operation

The use of prestressed anchor tends to reinforce some of the operational processes precisely because of the high demands placed on the safety of the work performed during construction. Therefore, the use of prestressed anchors is often of concern because prestressed anchors serve as the crucial role, so its quality requirements are quite high, so when to pay attention to what?
Prestress pretension method is the first on the pedestal according to the required design requirements will be stretched to the control of steel stress → and the use of temporary anchoring → pouring concrete → Concrete to be designed to achieve the strength of 75% or more cut off to rely on reinforced steel bars and concrete adhesion Pass preload. Simple construction, self-anchoring by adhesive force, without having to spend special anchor, temporary anchor can be reused (generally known as the tool anchor or fixture), mass production, economy, quality and stability. Used in small and medium-sized factory production.
Post-tensioning method for the buried pipe hole → pouring concrete → pumping → curing wear tendons → anchoring → grouting (to prevent steel rust). Rely on the anchorage to prevent the elastic rebound rebar, so that pre-stress concrete cross-section stress. This method has the advantages of simple equipment, no need to stretch the pedestal, and has the advantages of flexible production, but requires reliable anchors and jacks, and the anchor steel is large in size and suitable for large-scale construction on site.