Approaches to the automated design of restoration work on dilapidated gravity pipeline networks in the presence of foul-smelling gases in them

Federal State Budgetary Educational Institution of Higher Education «Moscow State University of Civil Engineering (National Research University)», Moscow, Russia

^* Corresponding author: orlov950@yandex.ru

Abstract

The article considers the problems of improving the efficiency of design, construction, and reconstruction of gravity-flow pipeline networks based on computer modeling, as well as automation of estimated calculations, considering the use of modern trenchless technologies. The authors present the solution to a problem of a choice of the optimum variant of repair from among alternatives at the reconstruction of a dilapidated pipeline from chrysotile cement of the corresponding diameter and extent in which underlying space there is a foul-smelling and aggressive gas (hydrogen sulfide) in the quantity considerably exceeding its maximum permissible concentration in the atmosphere of cities. Computer modeling considered maximum permissible concentrations of harmful gas emissions and values according to data from organizations operating the network. The results of the work of the automated complex are temporal characteristics of removal of gas components at the organization of artificial air exchange in the under-flowing space of the gravity pipeline at the expense of the selection of productivity of ventilation units. We estimated the cost parameters of preparatory, basic, and finishing construction-technological operations in the complex of works on estimating repair-construction works. For example, mechanical cleaning of the inner surface of the drainage pipeline, organization of dewatering in case of groundwater level above the pipeline, and television inspection of the pipeline after the restoration operation by alternative trenchless methods.