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New generation rock bolt
Our expandable rock bolts have strong expansion capabilities and excellent anchoring performance.
Tackling complex geologies
Our expandable rock bolts can meet various complex geological conditions and engineering needs.
Safe, efficient, and economical
Our expandable rock bolts provide customers with safer, more efficient, and economical anchoring solutions.
We’re here to help: Easy ways to get the answers you need.
The expandable rock bolt is made out of a thin-walled steel tube folded on itself. The expandable rock bolt is secured by injecting high-pressure water into the hollow cavity of the bar once it is inserted into the borehole. This process instantly strengthens and supports the structure by creating friction between the bolt and the borehole wall. It is composed of end sleeves, retaining rings, liquid injection ends and plates.
Function: hanging, beam forming, slope stabilization, arch forming, internal pressure
Application scenarios: hard rock mines, tunnels or emergency rescue
Our Features
Quality: We focus on material selection and quality control to ensure our products are of superior quality.
Fast: Our unique design and precision manufacturing processes enable fast and reliable expansion and anchoring, ensuring optimal performance and a dependable connection.
Cost-effective: It has high anchoring force, stability, corrosion resistance, and longer service life.
Install the anchor rod in the drill hole and inject high-pressure water. After the water pressure exceeds the elastic limit of the pipe material, the rod will undergo permanent plastic expansion deformation with the geometry of the drill hole, making it firmly embedded in the surrounding rock. In addition, when the rod expands, the anchor rod exerts a higher pressure on the surrounding rock mass, forcing the surrounding rock to generate strain, increasing the surrounding rock stress, and in turn, the surrounding rock also produces corresponding extrusion on the anchor rod. During the expansion, because its diameter become larger, there is a certain amount of shrinkage along the longitudinal direction, which causes the anchor plate to be pressed tightly against the surface of the surrounding rock, generating upward supporting force, thereby applying prestress to the surrounding rock.
| Item | Unit | Premium Line | Manganese Line | ||||
| Pm 12 | Pm 16 | Pm 24 | Mn 12 | Mn 16 | Pm 24 | ||
| Material | – | Q355 | Q355 | ||||
| Failure Load≥ | kN | 120 | 160 | 240 | 120 | 140 | 200 |
| Yield Load≥ | kN | 100 | 130 | 200 | 90 | 140 | 180 |
| Elongation≥ | % | 10 | 10 | 10 | 20 | 20 | 20 |
| Grouting Pressure | Bar | 300 | 240 | 300 | 300 | 240 | 300 |
| Section Diameter | mm | 28 | 36 | 36 | 27.5 | 36 | 36 |
| Round Tube Diameter | mm | 41 | 54 | 54 | 41 | 54 | 54 |
| Wall Thickness | mm | 2 | 2 | 3 | 2 | 2 | 3 |
| Upper Casing Diameter | mm | 28 | 38 | 38 | 28 | 38 | 38 |
| Expansion casing diameter | mm | 30/36 | 41/48 | 41/48 | 30/36 | 41/48 | 41/48 |
| Best Hole Enlargement | mm | 35-38 | 45-51 | 45-51 | 35-38 | 45-51 | 45-51 |
| Hole Diameter Range | mm | 32-39 | 43-52 | 43-52 | 32-39 | 43-52 | 43-52 |
Contact us now if you have any questions about our company and products. Any of your inquiry and suggestion will be highly appreciated. We will retain your information completely private.
China Reliable Rock Drilling Tools Supplier, Free Samples Available.
