Operating and Application Conditions of Low Prestressing Anchor Bolt

1. Expansion shell injection anchors.

They are suitable for supporting projects with hard and medium hard rocks, or underground projects with high stress, which is easy to happen rock burst. It can provide active support resistance after excavation and bearing force of single one is not more than 200KN. Its length can reach to 20m.

2. Resin and rapid hardening cement volume anchor bolt.

It can be used in anchorage engineering with all kinds of rock masses and can provide active support resistance after excavation and bearing force of single one is not more than 200KN. Its length is generally not more than 12m.

3. Frictional anchor bolt.

It applies to plastic rheological rock mass, mine roadway support bearing blasting vibration or high press rock tunnel projects which is easy to happen rock burst. Temporary support and preliminary support of tunnel and underground projects. Bearing force of single one is less than 80 KN. The length of frictional anchor bolt is generally from 1.2m to 3.0m. While water expansion and frictional anchor bolt can be lengthened.

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