Specific features of the static calculation of underground pipelines of gravity wastewater disposal systems

Summary

An essential pre-requisite for environmentally safe and reliable operation of underground pipelines of gravity wastewater disposal systems is specifying the requirements for the structural behavior of building construction elements (pipes, fittings) that are determined on the basis of a static calculation of the pipeline. In the process of the static analysis, direct and indirect loadings acting on the pipeline are determined and analyzed, and their impact on the structure is estimated. Existing approaches to performing a static analysis are considered. Based on the results of the studies carried out by Russian and foreign authors, it has been argued that the choice of the pipe parameters used in the construction of underground pipelines depends not only on the properties of structural materials, but primarily on the soil properties, conditions of laying and installation, as well as on the existing loadings and degree of pipeline deformation.

Key words

water disposal , underground pipeline , method , static calculation , trench , pipes , back filling

Efficiency of laying pipes made of ductile iron in seismically hazardous areas

Summary

At the current stage of housing and utilities reformation, with increasingly stringent requirements for the reliability and durability of municipal utility pipelines, the need to develop requirements for the selection of pipe materials and types tailored to the specific conditions of the installation and operation of urban water supply systems is becoming increasingly important. Proper selection of pipe materials is crucial to provide for the reliability of water pipelines in earthquake-prone areas of Russia. It is demonstrated that ductile iron pipes are currently the most promising choice for use in drinking water supply systems in earthquake-prone areas. It is noted that ductile iron possesses high strength properties similar to those of low-carbon steel (ultimate tensile strength, yield strength, and percentage elongation) and improved corrosion resistance. Information on seismic resistance calculations for ductile iron pipelines is provided to verify their safety for use in earthquake-prone areas.

Key words

water supply , reliability , ductile iron , calculation , materials , pipes , earthquake-prone areas