The strength classification of Mining Anchor Bolt can be divided from different angles:
Classification by material strength:
Common bolt: σ < 340MPa.
High strength (degree) bolt: σ = 340~600MPa.
Ultra-high strength (degree) bolt: σ > 600MPa. The majority of foreign countries are high strength and super high strength.
Classified by specific application:
General strength bolt: Generally used for small construction projects, its load strength is generally below 250MPa, and φ25 steel bars are usually used as the main body of the bolt.
Medium strength bolt: Generally used in large underground projects, its load strength is between 250-500MPa, and φ32 steel bars are usually used as the main body of the bolt.
High strength bolt: Generally used in large subway tunnels and other buildings, its load strength is between 500-800MPa, usually using φ40 steel bars as the main body of the bolt.
Special high-strength bolt: mainly used in special building structures, its load strength is above 800MPa, usually using high-strength alloy steel as the main body of the bolt.
Specific type of bolt:
HRB400 bolt: Generally used in foundation engineering and underground chamber support and other occasions, its tensile strength is 400MPa, suitable for the diameter of 16-40mm bolt.
In addition, it can also be divided into end anchorage, extended anchorage and full-length anchorage according to the anchoring length. According to the anchoring method, it can be divided into resin bolt, double quick cement bolt and inverted wedge metal bolt. According to the structure, it is divided into solid bolt, hollow grouting bolt and so on.
Please note that the above classifications are for reference only and may vary depending on the actual application and industry standards. In practical engineering, appropriate bolt type and strength grade should be selected according to specific conditions.
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