The anchor bolt or tendon is an effective, simple and quick installation and lower cost support device than any of the known support methods. There is a wide variety of bolts and tendons to fix the rock, ranging from wooden bolts to iron pipe bolts and smooth and corrugated steel rods with anchors that are generally of two kinds: point and longitudinal. The most widespread at present is the longitudinal anchor, of which the cement grout anchor is used more for its ease of application and low cost. The cement grout, however, has deficiencies for its application in anchorage due to its low resistance to tension and shear, volumetric contraction when setting, low adherence capacity, long setting period, low resistance to corrosion, humidity , to weathering and vibrations. The alternative is resin, but its high cost has practically eliminated its use as an anchor for bolts and tendons, espec...

The anchor bolt or tendon is an effective, simple and quick installation and lower cost support device than any of the known support methods. There is a wide variety of bolts and tendons to fix the rock, ranging from wooden bolts to iron pipe bolts and smooth and corrugated steel rods with anchors that are generally of two kinds: point and longitudinal. The most widespread at present is the longitudinal anchor, of which the cement grout anchor is used more for its ease of application and low cost. The cement grout, however, has deficiencies for its application in anchorage due to its low resistance to tension and shear, volumetric contraction when setting, low adherence capacity, long setting period, low resistance to corrosion, humidity , to weathering and vibrations. The alternative is resin, but its high cost has practically eliminated its use as an anchor for bolts and tendons, espec...