What Is Prestressed Anchor Bar?
Prestressed rock bolts are a form of active reinforcement technology. By applying pre-tension (prestress) to the bolts, they generate friction between the bolts and the surrounding rock/soil or concrete structure, thereby enhancing the structure's stability and load-bearing capacity. Simply put, this involves applying a tensile force to the bolts beforehand, allowing them to work in advance and share the structural load.
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01
Working Principle
Active reinforcement. By pre-tensioning the rod body, an active preload stress is applied to unstable rock and soil masses, thereby limiting their deformation.
02
Force Transmission Mechanism
It is divided into a free section and an anchorage section. Prestressing is applied only to the free section, while the anchorage section provides the anchoring force.
03
Construction Process
The process involves multiple steps with stringent requirements: drilling → threading → grouting (often requiring secondary grouting) → curing → tensioning → locking. It necessitates specialized tensioning equipment and a professional team.
04
Application time
Proactively applied before the deformation of rock and soil masses
05
Reinforcement Effect
Immediately effective, it significantly enhances the overall stiffness and stability of rock and soil structures while effectively controlling deformation.
06
Applicable Conditions
Projects with stringent deformation control requirements, such as deep foundation pit support, tall slopes, large caverns, buoyancy-resistant structures, and dam reinforcement.
07
Quality Control
Multiple critical factors require control, including tension force, prestress loss, and anchorage efficiency.
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