The concept of vertical expansion of development is becoming more and more popular in Russia, especially in large cities due to the scarcity and high cost of building land. This article continues the study presented in the material on the choice of a variant of the technology for constructing an operated roof, designed to be used, for example, as a recreation area, sports grounds, landscaping, etc. The article presents the results of a comparative assessment of the technological efficiency of the operated roofs construction, arranged with a traditional and inverse arrangement of a waterproofing carpet and thermal insulation. In the study, methods for evaluating their organizational and technological solutions based on technological efficiency indicators were applied. In addition, examples the systems engineering assessment tools use is provided. Determination of the manufacturability degree for the operated roofs installation on the basis of some system-technical principles and optimality criteria when comparing different options for organizational and technological solutions. Based on the calculation of performance indicators, a set of indicators with different dimensions arises. They are used as input for aggregate analysis when applying systems engineering. This approach allows achieving internal compatibility between the elements of the system, in this case, the obtained performance indicators. The technological advantages of the inversion installation of an exploited roof, in particular, intended for landscaping, have again been confirm.

Keywords: exploited roof, vertical gardening, inversion roof technologies

The exploited roof is intended for use, for example, as a recreation area, sports grounds, landscaping, parking lots, etc. It is proposed to compensate for the shortage of urban areas and the high cost of land within the city by using the concept of vertical construction expansion. The lack of free open space limits the ability to accommodate the necessary infrastructure to serve the growing number of residents and reduces the level of comfort for living. The article presents the results of a comparative study of technologies for the installation of operated roofs, arranged with a traditional and inverse arrangement of a waterproofing carpet and thermal insulation. As a result of the study, the technological advantages of the installation of an inverted exploitable roof intended for landscaping are shown. The labour intensity of technological operations and the duration of work when installing a green roof using inversion technology is 19.5% lower compared to the traditional one.

Keywords: exploited roof, vertical gardening, inversion roof technologies

The article is devoted to assessing the influence of errors in the experimental determination of initial data by non-destructive methods for recalculating the bearing capacity of building structures. When conducting an inspecting procedure the technical condition of the building structures that have been in operation for a long time, one of the main tasks is to determine their current operational suitability and predict their durability. The author considers possible errors or inaccuracies in the measurements of the physical, mechanical and geometric characteristics of a reinforced concrete beam (concrete class and reinforcement parameters). The degree of their influence on the change in the bearing capacity of the beam is compared. The conclusion is made about the greatest influence on the actual value of Mult (up to 34.5%) occurs from an incorrect determination of the diameter of the working reinforcement. Errors in determining the class of concrete remain within 1%; accuracy of determining the thickness of the protective layer - within 1.5% and they have a significantly smaller impact on the value of Mult.

Keywords: inspection of existing structures, methods of non-destructive testing, calculating of bending structures, reinforcement parameters

The article is devoted to the determination specificities of the actual compressive strength of the steel fiber concrete in existing buildings. The experimental studies results of an erecting mall constructions are presented. The monolithic fiber-reinforced concrete ground floor slabs were tested using three different destructive and non-destructive methods. The obtained results were analyzed. The high correlation (rdm-apo=0,855) of the steel-fiber reinforced concrete strength values obtained by the samples destruction and by the anchor pull out method was confirmed. The presented experimental studies results contribute to the statistical information accumulation on the issue of the actual strength of steel fiber reinforced concrete determination in full-scale constructions of erected buildings.

Keywords: fiber-reinforced concrete, full-scale structures, strength control, non-destructive testing methods (NDT), mechanical NDT methods, ultrasonic NDT methods