A Construction Method of Built-in Hollow Steel Fiber Concrete Protective Layer

Abstract

The invention relates to a construction method of a built-in hollow steel fiber reinforced concrete protective layer, in which steel fiber hollowed steel fiber reinforced concrete is arranged on the outer side of a steel filled concrete structural column for protection; and the durability of the structural components is improved. The thickness 2f of the protective layer is not less than 70 mm. The wall thickness e2 of the thin-walled hollow steel pipe is not less than 5mm. The hollow steel pipe is in the middle of the protective layer. The protective layer is poured with steel fiber concrete. The amount of steel fiber added is 1-1.5% of the concrete volume. The 50mm round hole forms a hollow structure. The net spacing of the circular holes is the same as the diameter d, both are 50mm. Due to the anti-corrosion effect of steel fibers and the restraint effect of hollow steel pipes on the protective layer, the internal steel pipe concrete structural columns are protected in corrosive environments, and the hollow steel pipes also have auxiliary load-bearing capacity. It can be used in harsh environments with corrosive environments such as artificial islands, river courses, port projects, and offshore platforms.

Description

technical field [0001] The invention relates to the anti-corrosion structure design of steel pipe concrete columns, and belongs to the field of structural durability design. In order to prevent the corrosion of concrete-filled steel tube columns in severe corrosive environments, steel fiber hollowed-out concrete-filled steel tubes are used as protective layers, which can be used in the construction of structures such as port projects, artificial islands, marine and river engineering, and offshore platforms to prevent durability problems from causing Structural damage. Background technique [0002] Severe corrosion environment such as the water level change area of ​​the marine environment, the steel pipe concrete column of the offshore platform, artificial island, port engineering structure, etc., there are many protection methods, such as the use of anti-corrosion coating materials and cathodic protection technology. Anti-corrosion coating materials must be maintained freq...

AI Technical Summary

Problems solved by technology

The steel pipe surface of concrete filled steel pipe is relatively smooth, and the bonding effect with the external concrete protective layer is not good. Once the concrete cracks, the steel pipe will lose its protection

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