The Role Of Prestressed Anchors In Tensioning Operations
Release time:
2021-06-10
The role of prestressed anchors: The term in academic terms is an anchoring device used to maintain the tensile strength of the wire and transfer it to the post-tensioned structure or the concrete ...
The role of prestressed anchors: The term in academic terms is an anchoring device used to maintain the tensile strength of the wire and transfer it to the post-tensioned structure or the concrete structure in the component. At the same time, the pre-stressed anchors, clamps and connectors have reliable anchoring characteristics, which ensures that the strength of the pre-stressed tendons is fully utilized, and the pre-stressed tension can be safely realized.
When using pre-stressed anchor tension, the engineer must select the attachment, anchor or connector of the given structure according to the type, technology, tension construction method and conditions of the pre-stressed tendon. Generally, the acceptance method has three necessary verifications: For non-critical dimensions, non-critical surface treatments, local defects, etc., users can verify whether it can be used. In several pre-joint tension systems, corresponding anchors and jacks are used according to the specifications of the tendons. Therefore, any connector must be of good quality, and the construction personnel must be professionally trained to strictly implement each regulation.
When there is no steel band in the anchor, the effective compression tension zone formed by the anchor is independent of each other at the tail or middle of the prestressed anchor. Especially near the surface of the upper plate, the areas of effective compression tension are circularly distributed and not connected to each other. The compression tension between the anchors is small, the spreading range before the stress is small, and the anchors cannot effectively support the surrounding rocks between the anchors. When there is a steel band in the anchor, the effective compression tension zone formed by the anchor rod extends significantly along the steel band. Near the surface of the upper slab, the effective compression tension area is elliptical and connected to each other to form a continuous effective compression tension area. The prestress spreads in a large range, and the anchor rod can effectively support the surrounding rock between the anchors.
The prestressed anchor steel belt realizes the effective diffusion of the prestress of the bolts, significantly improves the support of the surrounding rock between the bolts, and the overall support effect of the support system is significantly improved.
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