A Construction Method of Composite Secondary Lining Form of Shield Tunneling Sewage Tunnel

Abstract

The invention belongs to the field of underground engineering construction, and relates to a construction method of a shield method of a sewage tunnel composite secondary lining form. The method comprises the following steps of S1, implementing a surface treatment on the inner wall of a tunnel; S2, spraying the first layer of primer coatings on the inner wall of the tunnel; S3, carrying out surface treatment on the primer coatings; S4, spraying a top coating, which comprises the following steps that after the second primer coating is cured for 12 hours, two-layer two-component polyurethane waterproof anticorrosive coating materials are sprayed on the second layer of primer coatings, the first-layer two-component polyurethane waterproof anticorrosive coating materials and the second-layer two-component polyurethane waterproof anticorrosive coating materials have different colors; S5, treating a protective layer of the top coating, the method comprises the following steps of coating thesurface of the premier coatings with a layer of polyurethane as a protective layer after spraying and drying the second-layer two-component polyurethane waterproof anticorrosive coating materials, randomly spreading sand on the polyurethane, wherein the coverage rate of the sand is more than 50 percent and less than 90 percent, coating the polyurethane protective layer with a layer of cement mortar with the thickness of 1-3mm. The construction method is used for the sewage tunnel. The construction method not only can prevent corrosion, but also can prevent shock and permeation.

Description

technical field [0001] The invention belongs to the field of underground engineering construction, and relates to a construction method for a secondary lining of a tunnel, in particular to a construction method in the form of a composite secondary lining of a sewage tunnel by a shield method, which is used for the construction of an underground sewage pipe network project. Background technique [0002] With the continuous development of shield tunneling technology, its application in sewage pipelines is also increasing. In urban sewer facilities, ditches and pipes are almost all made of concrete. However, urban sewage often contains a large amount of salt solution, heavy metal solution, CH 4 , CO 2 and H 2 Chemical components such as S and small solid wastes will cause slow and continuous erosion of concrete and steel bars, which will affect the service life of the sewage tunnel; under the long-term groundwater and load, the tunnel will appear cracks or the gaps at the jo...

AI Technical Summary

Problems solved by technology

The invention belongs to the field of processing and manufacturing tunnel steel components, but the invention is applied to the field of anti-corrosion and anti-seepage construction in the form of the second lining of the shield-tunnel sewage tunnel; the coating used is only a single epoxy resin coating, and its function is relatively single. Its durability against impact and penetration is not strong

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