Prestressed anchor supporting in deep foundation pit slope, rock and soil surface engineering and tunnel, stope underground chamber construction used in a reinforced supporting way. Metal parts, pieces of wood, polymer or other material rod, into the surface rock or chamber surrounding rock holes drilled well in advance, using its head, the rod body of the special structure and tail plate (or not ), or are dependent on the surrounding rock stability of rock mass with bonding combined together and produce suspension effect, composite beam, reinforcement effect, in order to achieve the aim of supporting. Has the advantages of low cost, good supporting effect, simple operation, flexible use, the advantages of less occupied construction clearance. Rock bolt action mainly suspension action, combined action, squeezing effect.

The prestressed bolt axial force, the surrounding rock in a certain range the stress state of rock by one-way ( or two-way ) compressed into three dimension, thereby increasing its circumferential compressive strength, the compression zone can under its own weight, and can withstand a certain degree of external load, to effectively control the deformation of surrounding rock.

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