Kosiak O. Improving the efficiency of working body of multi-tier trenchless layer of underground communications

Subject of inquiry is the working process of soil cutting by the multitier SWB. The aim of the thesis are improving the efficiency of working body of multitier trenchless layer of underground communications by reducing of specific and total resistance. The methods are based on the theory of multitier cutting Soil, mathematical methods of theoretical mechanics, mathematical modeling, variations, differential and integral calculus, and classical methods of parametric optimization, theory and methods of mathematical statistics. The theoretical and practical results are the method of engineering calculation of working equipment for multitier scheme of soil cutting, on the basis of equality mass flow of soil in adjacent tiers; the recommendations of rational parameters of working equipment for laying of underground pipelines; developed and established experimental models of work equipment of trenchless layer. The scientific novelty: at the first time the principle of equality of the mass flow of destroyed soil in adjacent tiers was used for study reasoning of design and improve multitier SWB; at first time the mathematical models to determine the height and width of tiers and their number was based on minimizing of traction resistance of multitier SWB; the optimum shape of the cross-sectional flow soil divider of multitier SWB was gained; in the further developed patterns of destruction of soil is set of equivalent widths and cutting marginal soil to determine the limits of use of cutting depth of soil when laying underground communications inclined blade with positive cutting angle, vertical knife of multitier SWB. The degree of implementation: the method of calculating of the optimum parameters of working multitier trenchless layers for distribution pipelines and underground utilities and put into production NVP "Haztehnika" (m. Kharkiv), which is used for the design of new and modernization of existing machines to improve the technology of laying of distribution pipelines; the results of the thesis are introduced in the curricula of the courses NUWARU "The earthwork machinery," "Machines for laying underground communications". Scope: Construction of underground pipelines for various purposes.