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The paper observes various technologies of diaphragm wall implementation as a shoring system in excavation pits. Protection of the adjacent existing buildings and structures and maximal removal of the impact to the existing city building system during construction process are considered as the key positive factor of the diaphragm wall technology. The consideration is made basing on the completed projects within dense existing building system of Saint-Petersburg where each free land plot is valuable and shall be used with the maximum benefit.