The Use of Domestic Pneumatic Equipment at Enterprises of Building Industry
One of the time-consuming technological conversion of production of precast reinforced concrete structures at enterprises of the construction industry is theunloading of cement from railway cars (hoppers) at cement warehouses and transporting it to concrete mixing units. The use of outdated pneumatic screwpumps for cement pneumatic transport at most cement warehouses often disrupts the rhythmic work of warehouses, mainly due to the rapid wear of thepump screw. This leads to a decrease in productivity and high energy consumption of pneumatic screw pumps. The elimination of this disadvantage is mostadvisable by replacing the pneumatic screw pumps with the chamber pumps consuming only compressed air. The proposed chamber pump is characterizedby simplicity of design, so that its production is accessible for repair-mechanical shops of construction enterprises, as well as high performance and reliability,which makes it possible to fit into the standards of wagons unloading. Molding processing in the production of precast concrete products and structures isfundamental, as it lays the consuming qualities and physical and technical characteristics of products. When forming internal wall panels, solid floor slabs ina vertical position, the main drawback is the heterogeneity of the concrete strength along the height of the product, as well as numerous pores and voids onthe front surface of the products that require additional operations at the enterprises for their filling. It is proposed to use an internal pneumatic vibrator, whichhas a simple design, has the possibility to manufacture and repair on its own at the enterprise. Working drawings for a line of site and internal pneumaticvibrators of various nominal sizes, as well as a chamber pump for cement transportation have been developed. The accumulated practical experience inthe technology of production of reinforced concrete products and structures shows the possibilities for improving the technological processes of production.Chamber pneumatic pumps passed the practical test, and also pneumatic vibrators (mounted, internal) of various design solutions significantly expand thecapabilities of the factory technology.