Ground Freezing

Ground freezing using brine or nitrogen is used as a temporary ground improvement. Ground freezing supports tunnel excavations and crossings in groundwater. It is based on a very simple physical principle. By artificially lowering the ground temperature, all water in soil pores or fissures is frozen, thus increasing the strength and impermeability of the surrounding ground.

With temporary gap-freezing, 'water-tight' excavation pits can once again become water-permeable after completion.