Principle of ground freezing
Ground freezing technology makes use of the properties of artificially frozen ground. To achieve this, freeze pipes are bored or driven into the ground in specified intervals. A refrigerant is passed through the freeze pipes absorbing the heat of the surrounding ground as it circulates. This leads to the formation of cylindrical frost bodies surrounding the freeze pipes which gradually coalesce to form frozen walls or slabs. As a rule, frost bodies can be produced in any shape by placing the freeze pipes in the appropriate positions. The frost bodies are monitored by temperature sensors placed within the frozen body or in the ground adjacent to the frozen area.