Engineering restoration of the St. Petersburg conservatory

The building of the St. Petersburg Conservatory is based on original structures of the Bolshoi (Stone) Theater, built at the end of the XVIII century. This determine foundations diversity, presence of unbound seams in joints of brick walls of different construction periods, and other features identified during the survey, as well as at the engineering restoration. The construction history study, as well as the organization of scientific and technical support for design and restoration, made possible quick assess of revealed structures and their components technical condition and technical decisions aimed at simultaneously ensuring mechanical safety and preserving the historical structures authenticity. The device effectiveness has been confirmed at the pre-design stage of experimental sites for rubble masonry foundations injection fixing, which make it possible to include the injection solution exact costs in the project. Following issues are considered: effective methods of the rubble masonry foundations technical condition studying, assessing additional settling at the building structures loading with payloads, the risk of temperature deformations during the elimination of spontaneous deformation seams at the walls junction of different construction periods, the possibility of historical stairs structures using to reception the normative payload corresponding to the escape route.