Ground Freezing System
Ground freezing is a temporary ground support technique that is used extensively for groundwater control and ground stabilization in underground construction and deep excavations. The process involves circulating refrigerated liquids through a series of subsurface pipes to freeze the ground creating a solid barrier that prevents water intrusion and provides structural support for excavation.
Boart Longyear manufactures ground freezing drill rods that are installed for refrigerated liquid circulation. Freezing rod applications have some unique challenges that are not found in typical foundation construction drilling application. Boart Longyear has gone through extensive development processes to ensure the freezing rods we provide incorporate our knowledge of construction drilling as well as unique technologies that are special to the ground freezing application.
Each ground freezing project has its own distinctive challenges which make the tooling requirements unique. Boart Longyear offers the services of designing the tooling package to meet your specific needs.
Product range
• Freezing rods up to 114 mm diameter and lengths up to 3 m.
• Driving rods with various bit configurations including carbide tips and flushing holes with check valves.
• Rotary drive flanges.
• Rotary percussive freeze rod systems available upon request.
Key features
• Specially selected steel to provide strength required for drilling while also remaining stable when subjected to extreme low temperatures.
• Specially designed threads that maintain a tight seal in the drill string, preventing leakage of freezing fluids into the surrounding ground.
• Custom designed rod seals that can withstand low temperature as well as tolerate various greases commonly found on drilling sites.
• Various configurations of driving points incorporating carbide inserts, flushing holes with check valves, and percussive bits.
• Economical rod designs keeping total project cost to a minimum.
