A construction method of anti-seepage and anti-corrosion sewage pipeline segment lining based on shield method

Abstract

The invention relates to a construction method based on a shield method for an anti-seepage anticorrosion sewage pipe segment lining. The method comprises the following steps that (a) holes in shield segments and gaps between the segments are blocked through epoxy resin; (b) the inner cambered faces of the shield segments are polished to expose inner pores of the shield segments; and (c) polyaniline / epoxy resin mixed coating is sprayed on the inner cambered faces of the shield segments and cured to form protecting coatings. Through the construction steps of epoxy resin blocking, shield segment inner cambered face polishing and protecting coating forming through curing, the construction process is more economical, simpler and rapider, the effective utilized area in pipes is increased, flow resistance of the coatings to sewage is smaller, and the pollution discharge speed is increased. In addition, the protecting coatings have excellent film-forming performance and corrosion resistance and can effectively resist corrosion of acid, alkali and salts in the sewage pipes to the reinforced concrete segments.

Description

technical field [0001] The invention belongs to the field of building construction, and relates to a construction method for a sewage pipeline segment lining, in particular to a construction method for an anti-seepage and anticorrosion sewage pipeline segment lining based on a shield method, which is used for underground sewage pipe network engineering construction. Background technique [0002] With the increasing perfection of shield tunneling technology (ie, shield method), its application in sewage pipelines is increasing. In the current sewer facilities in our cities, both pipes and sewage treatment are concrete structures. However, because the sewage in the sewage tunnel contains a large amount of salt solution, heavy metal solution, CH 4 , CO 2 and H 2 Chemical components such as S have a certain erosive effect on concrete and steel bars, which will affect the normal service life of the tunnel. Therefore, it is very important to study how to prevent these structu...

AI Technical Summary

Problems solved by technology

Using this method for lining structure construction not only has high efficacy, but also has a long anti-corrosion time and greatly increases the cross-section of the pipeline compared with the traditional concrete secondary structure. However, this method has many steps, complicated processes and time-consuming, which is not conducive to improving the construction speed.

The Chinese invention patent with publication number CN 1098485A discloses a long-distance metal pipeline lined with plastic film pipe anticorrosion construction method, using plastic film as anticorrosion sealing material, after metal pipeline pretreatment, coating primer, adhesive glue, lining The construction technology of sticking plastic film tube, sealing and bonding the flange surface, etc., makes the anti-corrosion inside the metal pipe meet the requirements. The primer is epoxy resin, low molecular polyamide, hardener, moisture absorbing agent, thixotropic agent and tackifier and other components; although this method is simple in construction and low in cost, the anticorrosion performance of epoxy resin needs to be improved

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