The connection of high-strength precision-rolled threaded steel bar is to prevent mutual sliding of connecting parts by friction between contact surfaces.
Rock Anchor and Rock Bolt
The material of rock bolt body mainly includes high-strength steel wire, steel strand, hot rolled rebar and other high-strength steel. It can stretch freely under tensile load. When this part of elongation is permanently fixed or “frozen”, a certain pre-compression stress is generated on rock mass or various structures.
Therefore, rock bolt body is the main part to realize medium anchoring by tension. At present, main materials used in prestressed rock bolts in mining are fine-rolled threaded steel bars.
Friction Between Rock Bolt Rebar
The connection of high-strength precision-rolled threaded steel rebar is to prevent mutual sliding of connecting parts by friction between contact surfaces. To make contact surface with sufficient friction, it is necessary to increase clamping force and increase the friction of contact surface. Clamping force between components is achieved by applying a pre-tension to rock bolts, so the connectors (finished rolled rebar, bolts, etc.) must be made of high-strength steel.
Threaded Rock Bolt Rebar
Precision-rolled threaded steel bar is a rigid prestressed anchor. It is a steel bar made of 40Si2MnV or 45SiMnV, which belongs to high-strength steel, and has a complete external thread on. At any cross-section, it can be connected or anchored with a connector or anchor with an internal precision rolled screw anchor. The use of this type of rock bolt body is convenient for construction and safe and reliable for anchoring.