Hydraulic Expansion Anchor

Water Swelling Friction Bolt is made by high strength welded tube folded itself and welded to seal at both end of bolt.

Working principle:

When the bolt is used in the hole, the bush with a hole is connected with a chuck of a high-pressure water pump. Start the pump and inject the water into tube, the folded wall of bolt is forced to expand. When the pump reaches a standard pressure, the wall of bolt holds onto the strata and creates a big friction strength to support.Thus, a safety and stable support system is formed. The main application of the Hydraulic Expansion Anchor is temporary rock reinforcement in Mining and Tunneling. Bonding forces between the friction bolt and the rock mass are caused by form closure and friction transfer between the borehole wall and the rock bolt which is expanded by hydraulic pressure.

Fields of Application:

Systematic reinforcement of underground excavations

Temporary ground control

Main Advantages:

Immediate full load bearing capacity over the entire installed bolt length

Low sensitivity against vibrations caused by blasting works

Ability to maintain load-bearing capacity even when undergoing deformations

Safe and easy installation

No additional building materials required for installation

Flexibility in case of differing or varying borehole diameters

Quality check during every single installation