Abstract
The article represents a summary of findings of various research projects aimed at the optimization of specific items of small size machines developed and pilot tested at different stages of construction operations.For 15 years, Department of Mechanization of Construction Processes, Kharkiv National University of Civil Engineering and Architecture has been engaged in design, pilot testing and monitoring of practical application of small size construction machinery. All machines and items of equipment have adsorbed numerous research findings, and no similar products are available in Ukraine and worldwide.The authors analyze different items of construction machines that have already been tested in the course of construction operations. They include a twin-piston counterflow mortar-and-concrete pump, two-piston direct-flow mortar-and-concrete pumps equipped with ball valves, spring valves and disk valves, advanced cascade concrete mixing machines. Each of the above machines can operate in pursuance of a pre-set pattern of shotcrete operations.All machines are universal, as twin-piston concrete pumps may pump concrete mixes having different workability rates; they can also be used to transport building mixes in horizontal and vertical directions; they are applied for shotcrete operations. They are efficiently used in the preparation of different mixes.All machines and items of equipment are protected by Ukraine-wide patents. They are recommended for wide-scale use due to sophisticated structural solutions invested into their design.
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