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  • On the problem of the use of jet grouting technology in the construction of deep underground facilities

    Jet grouting technology is gaining popularity in practice. Until recently, the main area of application was considered strengthening the bases and foundations, as well as strengthening the walls of trenches in the construction of underground parts of buildings. At the same time there are examples of the use of technology inkjet technology for advanced fixing of deep underground facilities, as well as the mouths of vertical shafts. With the help of this technology is arranged anticipatory lining, which ensures the stability of the construction of the walls and reduce the inflow of groundwater during construction. This greatly reduces the complexity and duration of construction, increased safety. For a broader introduction of jet grouting technology in the construction of deep underground facilities must be a comprehensive study of patterns of interaction with the surrounding structures grouting array of temporary and permanent support of the barrel at various stages of penetration with the influence of the construction technology, heterogeneity of rocks and other factors. This will justify the optimal parameters walling in different environments and to develop effective technological schemes of production work

    Keywords: geomechanical state geological environment, the array, evaluation, arched part, the transport tunnel spectrum, acoustic resonance inspection, prognostication, control, forecast, weakened mechanical contact

  • Design of hot water-supply using renewable energy sources

    "Application of solar energy in supplying various infrastructure units is urgent these days. Traditionally these were the centralized urban heating systems, which were used for heating buildings. The suggested heating system is composed of solar collectors with a total area of 44.16 m2 and with a volume flow of hot water to the consumer of 1.5 m3/h. Computer-aided heating circuit consists of traditional circuits, composed of solar collectors, circulation pump and a lamellar heat exchanger. Additionally, the scheme is extended by a fixed temperature water tank and a circuit, which interfaces the heating systems. They will be in their turn separated by a heat exchanger. The equipment also provides an opportunity of organizing a reverse pairing with the heating systems to return the excess heat into the network. This scheme has several modes of operation. In the conditions of nighttime, cloudy afternoon, light fog or smog water heating is provided by a central source. If during daytime, while being heated directly by the sun the water gets overheated the overheated water discharge mode is switched on automatically to discharge excess heat to a central heating system. The scheme provides for a “solar connectors and central source of heat parallel operation mode” to maintain the desired temperature, for example in the morning. According to the results of observations the share of water heating due to the solar collectors in summer is on average about 75%. Shared usage of central source of heat and solar collectors allows to efficiently use the available energy resources."

    Keywords: renewable energy sources; solar collectors; computer-aided heating circuit; reverse pairing with the heating systems; efficient using of the available energy resources