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

Enhancement of Technologies of Trenchless Laying of Underground Communication Means and Service Pipelines

Summary

An analysis of trenchless methods of building of horizontal wells for the laying of underground services is presented. A method of horizontal drilling involving the processes of destruction of rock mass and its removal from the well built possesses the biggest reserves of technical potential. Ways of improvement of the efficiency of a drilling process are considered. A new technique of drilling in the course of which a major part of rock destructed is removed and the lesser part remained is pressed into the well walls with the purpose of increasing their strength and solidity is offered. Transportation of rock mass is carried out by air flow in a special revolving pipeline. The results of laboratory and production tests of a mockup sample of a drilling device using the developed technique of drilling for building of horizontal wells are presented.

Key words

trenchless laying , underground pipeline , drilling , soil compaction , stability of well , horizontal pneumatic transportation