Method for enhancing durability of pier column under freeze thawing or chlorine salt erosion environment

Abstract

The invention discloses a template and method for enhancing the durability of a pier column under a freeze thawing or chlorine salt erosion environment; the template comprises a pier column template and a sheath which is provided with high freeze thawing durability and / or chlorine salt erosion resistance, wherein the sheath is fixed on the inner wall of the pier column template; a detachable connecting structure is adopted between the sheath and the pier column template; when pier column concrete is cast and a mold releasing condition is satisfied, the sheath and the pier column concrete are combined together; the pier column template is detached, so that the pier column template is separated from the sheath; and the sheath is left on the surface of the pier column. According to the invention, through using the prefabricated sheath with excellent durability as a pier column protective measure, the durability of the pier column can be obviously enhanced, the cofferdam transferring speed can be increased in the construction period, the offshore operation time is greatly reduced, a large amount of maintenance cost can be saved in the operation period, and obvious technical and economic benefits are obtained.

Description

technical field [0001] The invention relates to a formwork for improving the durability of pier columns under freeze-thaw or chloride-salt erosion environments, and a method for improving the durability of pier columns under freeze-thaw or chloride-salt erosion environments, and is especially suitable for freeze-thaw cycles or chlorine-salt erosion environments. Concrete cast-in-place construction piers under erosive conditions. Background technique [0002] The beam-column structure is the main form of cross-river, cross-river, sea-crossing or offshore engineering. A large number of engineering examples show that the part in the tidal range area and wave splash area is the first to be corroded due to freeze-thaw cycle damage or chloride corrosion. , thereby shortening the normal service life of the structure. When designing the durability of the structure, some protection measures have been taken for the tidal range area and the splash area, such as the use of high-perform...

AI Technical Summary

Problems solved by technology

The use of permeable formwork lining can significantly improve the freeze-thaw cycle resistance and chloride ion erosion resistance of the surface concrete, but the depth of improvement is limited, often only a few millimeters

The quality of coating application and silane impregnation is not only affected by the quality of the concrete within the protective layer, but also by the site operating conditions, and its performance often does not meet the design goals

Especially at sea, marine organisms such as barnacles and oysters can seriously damage the integrity of the coating, which can lead to large-scale peeling off of the organic coating in just a few years, making it lose its protective function on the pier concrete

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