An overview of the substantiation of the relevance of the transition to mass ecological housing construction, which is determined by an acute shortage of housing and a high increase in the cost of electricity, is given. The development of an ecological substantiation of an energy-independent house using the example of a one-story house, taking into account natural and climatic conditions, is presented. The characteristics of the work of all utilized engineering systems are considered. It has been established that the housing and utilities sector, being one of the main sources of air and groundwater pollution, creates a large amount of household waste, which has a detrimental effect on the environmental situation. Renewable energy sources have an inexhaustible supply, since they are obtained from natural processes that will not be exhausted in the foreseeable future. Thus, the prospects for renewable energy sources are in considering them to replace fossil fuels. Economic efficiency is defined, which implies that the energy source is economical both in relation to the net cost of production and in relation to supply. The development of renewable energy sources will play an important role in the transformation and digitalization of the Russian power industry. Technologies of energy storage, intelligent systems for forecasting production and demand, predictive analytics of equipment condition, consumption management and many others will be developed.

An overview of the rationale for the unweighted hollow-core floor slabs use is given. The technological and design features of hollow-core floor slabs are considered. The possibilities of rational use of unweighted hollow-core floor slabs are presented. The calculation of monolithic floor slabs was carried out in the Lira software package on the basis of existing technologies, current standards and the methods for calculating the unweighted hollow-core slabs. The performance of floor slabs with spans equal in two directions is considered. It was found that regardless of the span of the floor slab, the effect of reducing its own weight exceeds the effect of reducing the section rigidity. The total deflection due to the own weight of the floor slab and the payload on it for the hollow core slabs is lower than for solid slabs of the same span. The use of unweighted monolithic slabs provides a reduction in the dead weight of the floor slab up to 35%. Reducing the load on the slab also provides a reduction in the reinforcing steel materials application rate. The use of unweighted monolithic floors by reducing the weight of structures and reducing their deflections will significantly optimize the structural schemes of buildings. The performed numerical experiment makes it possible to establish the boundaries of the effectiveness of the unweighted hollow-core monolithic floor slabs‘ use, upon reaching which the use turns out to be significantly more profitable than the use of traditional beamless floors.

Abstract. The paper considers the problem and its solution for the effective modification of the impulse rotators construction. When applying torsional vibrations to the working tool, the destruction of rocks occurs on the cleavage. The kinematic exciters of oscillations are able to change the amplitude-frequency characteristic, the loading pattern, the quality of processing according to the requirements of the material being processed. Constructive use of the oscillation device contains links and kinematic pairs, which quantity and quality determine additional drive energy losses. The authors estimate the expediency of drive elements installed by the magnitude of losses and the increase of effective work. The costs per output unit should not exceed the losses in the existing structure after changing the rotation drive of the working element.