bbk 000000
UDC 628.241
Lobanov A. A., Gromov A. A., Zhuravlev A. E.
The experience of constructing the extension of the main sewer in the northern part of St. Petersburg
Summary
The experience of constructing the extension of the main sewer in the northern part of Saint-Petersburg is presented. The works were carried out in a complex hydrological environment with the use of advanced tunneling machinery. Pressure-gravity drain siphon was chosen from the options considered. During the shaft construction both traditional methods (drilling freezing columns, shaft freezing with formation of glacial soil massive, boring in glacial soil shield with installation of immediate support of reinforced concrete tubing, construction of reinforced concrete jacket and technological shaft equipping), and new ones (shaft shielding with piled walls followed by drilling and constructing reinforced concrete jacket, shaft boring with shaft sinking machine and installing immediate support of segment blocks and sinking the whole support structure with shaft sinking) were used. In the process of constructing the main siphon tunnels boring with mechanized complexes with simultaneous assembling the immediate support of the tunnel with reinforced concrete tubing was used. At wash-out site in the process of boring the second line of the siphon an advanced tunnel-boring complex with hydroweight and hydrohaulage with constructing immediate support of the tunnel of segment blocks was used. To provide for the nonsilting flow rate in the sewer under the conditions of wastewater flow decrease a flow regulation facility was built in the lowest sewer point. The use of the advanced tunneling complex provided for shortening the timeline to completion of the sewer construction, ensuring leaktightness of the constructions and operations safety eliminating workers access to the tunnel face. Commissioning the extension of the sewer in the northern part of Saint-Petersburg provided for increasing wastewater treatment to 98.4%.
Key words
wastewater , monitoring , sewer , gas corrosion , shaft , tunneling complex , microtunnel
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UDC 628.247
Vasilyev V. M., Klementyev M. N.
Specific features of sewer tunnel construction and rehabilitation in Saint-Petersburg
Summary
The basic facts about the construction of deep sewer tunnels in Saint-Petersburg are presented. The causes of gas corrosion in sewers and their structural components are considered. The methods of protecting sewer tunnels in the process of construction or rehabilitation from gas corrosion are suggested. At the stage of designing the construction of a new sewer or its rehabilitation the concentration of gases in the underroof space must be measured. On the basis of the calculation data the decision on the sewer design, elevation differences, gradient and other parameters that ensure trouble-free operation is made.
Key words
collector , sewer tunnel , gas corrosion , composite material , protection from corrosion
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DOI 10.35776/MNP.2020.04.09
UDC 628.147.2+628.247
Kel’ Roman
Stages of development of repair methods for water distribution
and sewer networks
Summary
The construction of water distribution and sewer networks in Novokuznetsk was carried out in 1950–1970 with the rapid development of the industrial city. Today Vodokanal LLC is the main provider of cold water supply and wastewater disposal services to the population and industries in Novokuznetsk. In the 1990s, the conditions of the networks and the economic situation in the country required the search for advanced time-effective construction and repair technologies at minimum use of resources and finance for the most efficient performance of work. Today, the attitude of the enterprise for search for technically new, while also cost-effective, methods of repairing water distribution and sewer networks allow providing consumers with high-quality drinking water as one of the factors of sanitary and epidemiological well-being, improving the efficiency, reliability and quality of operations of the municipal drinking water supply and wastewater disposal facilities.
Key words
diagnostics , rehabilitation , gas corrosion , rehabilitation , water distribution and sewer networks , HD polyethylene , corrugated polypropylene , steel sewer wear , pipe locator , leak detection , teleinspection float raft , multifunctional mobile emergency-repair vehicle
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