The so-called anchor, is the slope, geotechnical engineering and deep foundation and other surface tunnels, stopes and other underground chamber used in the construction of a reinforced support method. Mainly metal, wood pieces, pieces of polymer or other material rod, into the chamber surrounding surface rock, or pre-drilled hole in rock, its head, rod and tail structure of special pallets ( can not), in order to achieve the purpose of supporting. There are prestressed anchor bolts and other categories.

 1. Drilling:
    Hole position error: the horizontal direction should be greater than 50mm, the vertical direction should not exceed 100mm
    Hole depth: not less than the design length, the length should not be greater than 1% of the design
    Aperture: Tolerance ± 10mm
    Drilling the bottom of the skew: the length of the bolt size should not exceed 3%.

 2 bolt assembly:
     Strand should be in addition to oil, rust
     Intervals along the rod axis to set an isolation rack 1.5m
     Free section of the application rod wrapped in plastic pipe, nozzle should be sealed with wire banding Bing.

 3 bolt-tensioning and locking:
     Bolt tension before the deal with tension calibration device
     Anchoring strength of the concrete body and the pedestal were greater than 15.0MPa when, before the tension
     Bolt tensioning sequence, you should consider the interaction between adjacent anchor
     Anchor Zhang Rojo set classification and observation time, bolt locks should be strictly according to specifications.

   In addition to mastering the above construction technology, construction workers must also do bolt construction quality assurance measures.

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