Tag:composite material

№01|2015

CORROSION PROTECTION

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UDC 628.24

Vasilyev V. M., Klementyev M. N., Stolbikhin Iu. V.

Methods of protecting tunnel sewers and in-line structures  from corrosion

Summary

Hundreds kilometers of tunnel sewers and in-line structures mostly made of reinforced concrete have been in operation in Russia. A pressing problem of their damage exists caused by microbiologic (gas) corrosion. Common and theoretical possible methods of protecting sewers and in-line structures from microbiologic corrosion are considered. The classification of methods with the use of foreign and domestic literary sources and from own operation experience was carried out. The classification is based on the principle of the method group capability compliance to counteract any mechanism occurring in the process of reinforced concrete structure corrosion. The methods have been summarized in four tables according to the processes occurring in sewers. The analysis of corrosion protection methods has been carried out; the main drawbacks of each method have been determined together with the conditions of using the methods at the stages of design and construction, operation and upgrade. Special attention is paid to the methods of passive protection most often used by water companies to solve the given problem. As a main method of passive protection the use of different protection coatings is considered. The results of studying the rigidity of the protection coatings made by various manufacturers under corrosive medium impact caused by the operation of a pressure suppression chamber in Novosibirsk are presented. The principle of the studies was long-term exposure of concrete samples with surface protection coatings. The possible use of two common trademarks for protecting underground reinforced concrete sewers from destruction was approved.

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№1|2013

RECONSTRUCTION OF SEWERS

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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.

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