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The article discusses the pile indentation equipment for dive prefabricated reinforced concrete piles which are used in clay soils in urban environments. It was developed in 2003 and intended for dive reinforced concrete piles of different cross-sectional (square, round, prismatic, ring, etc.) length from 5 to 12 meters. Different modifications (SVU-1, SVU-2 and SVU-3) have been prepared during the period of equipment’s exploitation. They have dived more than 35,000 prefabricated concrete piles in Tomsk, Novosibirsk, Omsk, Kemerovo and other cities of Russia. In 2011 specialists of “FundamentSpetsStroy” (Tomsk) and specialists from the Kuban State Agrarian University (Krasnodar) developed a special device-meter, which provides to get information on efforts of the indentation piles at predetermined elevations. The article describes a structure of device and its operating principle. The principle of device based on the conversion parameters of pressure hydraulic system of pile indentation equipment during the pile diving into an electrical signal that is converted to digital information. The article presents the main results of effort indentation of piles, also tables of received values and graphics. The article performed an analysis and the generalization results of experimental research.

The article describes the reconstruction of the historical stone building basements. It provides a brief description of the constructive solution of the buildings under consideration and summarizes information about their technical condition. The article highlights the importance of analyzing information about the construction and operation of buildings during the entire history. This article lists the main tasks of the reconstruction of historical buildings: area augmentation due to the reconstruction of previously unexploited basements, deepening of basements, expansion of existing openings in the walls and construction of new ones, arrangement of new entrance nodes into the basements of a building, etc. Besides, the article gives a brief description of the soil conditions of the reconstructed buildings sites, which are typical for historical buildings in Tomsk. It points out the need for thorough engineering and geological examinations with additional geotechnical examination of the soil base. Additionally, the paper clarifies the necessity to examine the characteristics of supporting layer foundation soils, changed due to their compaction by the weight of the building during the period of long-term operation. The results obtained during the examination and assessment of the technical condition of foundations and overhead building structures will be presented. Also, this study proposes classification of methods for strengthening natural foundations (freestanding, strip, slab and massive) using piles. In particular, it talks about piles that are installed without soil extraction - displacement piles (pressed and injected), as well as examples of numerical modeling of the work of detached and strip foundations reinforced with the use of piles when the basement floor elevations are lowered. Finally, it shows he experience of scientific and technical support for the reconstruction of buildings.