ABSTRACT
The applied methods for the detachment and support of excavation walls should secure integrity of the natural structure of soil in the foundation subject to construction. Construction of footings must be performed in a minimum span of time, especially in the winter and rain seasons. The sooner after excavation one undertakes the construction of footing and filling, the more natural does remain the structure of soil in the foundation and the smaller will be the cost of dewatering excavations. Frozen soil possesses the properties of impermeability and considerable strength. The technology of artificial freezing is based on the observation that some liquids remove heat from the ambient environment upon the evaporation at negative temperatures. The coil in which liquid is evaporated is surrounded by brine. The stability of deep trench walls prior to cast operations is secured by the cqunterpressure exerted by the clay solution which is continuously poured almost up to the edge of the leader shaft.
