Different Types of Prestressed Anchorages Are Installed and Used Differently
Prestressed anchorages are mainly used in engineering construction, and play a very important role in concrete tensioning. The types of prestressed anchorages can now meet the requirements of various engineering buildings, and the most important thing is that they can be used more comprehensively.
There are many specifications, models, and sizes of prestressed anchorages, which are mainly used in the construction of highway bridges and railway bridges. The industry standard can meet the technical requirements of transportation, so it can achieve a safer and more stable effect in the process of use.
Different types of prestressed anchorages are installed and used in different ways. The prestressed anchorage is mainly divided into stressing anchorage and dead-end anchorage according to the purpose and installation method.
1. Stressing anchorage
The stressing anchorage is an anchorage installed at the end of the prestressed tendon and can be tensioned. The function of this anchorage is to maintain the tension of the prestressed tendon and transmit it to the concrete in the post-tensioning structure or member. For example, ZJM13 series anchorages can anchor Φ12.7 steel strands, and ZJM15 series anchorages can anchor Φ15.24 steel strands. The stressing anchorage has good anchoring performance and self-anchoring performance. The stressing anchorage is generally composed of four parts: anchor head, wedge, bearing plate, and spiral reinforcement. The wedge is the key part of the stressing anchorage, and its forms are usually two-part and three-part and are made of high-quality alloy steel. Generally, YDC series multi-strand center hole jacks are used for tensioning stressing anchorages.
2. Dead-end anchorage
The dead-end anchorage is an anchorage installed at the end of the prestressed tendon, usually embedded in the concrete and not tensioned. The dead-end anchorage is suitable for the design stress at the end of the component is large or the end space is limited, and the post-tensioning prestress needs to be directly transmitted to the end of the beam.
Dead-end anchorages usually have P-type and H-type. P type dead-end anchor is a kind of wrap-around anchor that needs to use a barrel swager to compress the extruding anchor on the steel strand. H-type bond head anchor is a kind of anchor that uses an onion jack to roll the end of the steel strand into a pear-shaped head.