Pressure injection is the process of forcing sealing or reinforcing material into cracks, fractures, and voids in rock mass. It is one of the methods for restoring rock monolithic integrity and sealing workings — without dismantling existing support.
Applications in underground mining:
- Borehole cementation with cement milk
- Roof sealing or void filling
- Bonding, strengthening, and sealing weak and fragile layers of rock mass and coal
Injection materials:
Ready mixes and cement-based grouts are used for injection. Depending on geological conditions, material with appropriate viscosity and setting time is selected. Mineral binders provide durable reinforcement and sealing of rock mass.
Injection equipment:
The primary device is an injection unit — e.g., the pneumatic AI-01 "FRANIA" unit adapted for work in underground methane and non-methane mining plants. The device holds ATEX certification, approving it for use in methane and dust explosion hazard zones. Parameters: supply pressure 3–7 bar, capacity 6–25 dm³/min.