Novel FRP (fiber reinforced plastic)-steel tube-epoxy resin-sea sand concrete compression member

Abstract

The invention belongs to the field of engineering structures, and particularly relates to a novel FRP (fiber reinforced plastic)-steel tube-epoxy resin-sea sand concrete compression member. The member is characterized in that an epoxy resin layer is coated on the inner surface of a steel tube, and the steel tube is internally filled with sea sand concrete; an FRP material layer is overwrapped on the outer surface of the steel tube; because the FRP material layer is overwrapped outside the steel tube, and the steel tube is prevented from being in direct contact with the external environment, so that the durability of the steel tube is improved obviously; meanwhile the epoxy resin layer is coated on the inner surface of the steel tube, so that the sea sand concrete and the steel tube are isolated, and the corrosion effect of chloride ions in sea sand on the steel tube is avoided; and the potential safety hazards of the sea sand concrete are reduced, and the application of the sea sand concrete is promoted. The member is applied to high-corrosion coastal and offshore areas and the like, bears the load mainly focused on axle load, and has favorable economical and environmental benefits.

Description

technical field [0001] The invention belongs to the field of engineering structures, and in particular relates to a novel FRP-steel pipe-epoxy resin-sea sand concrete pressure-bearing member. Background technique [0002] Structural durability is a very important and urgent problem that needs to be solved, and has attracted widespread attention from all walks of life, especially in coastal and offshore areas, where structures are eroded by the marine environment, resulting in particularly prominent durability problems. Steel pipes or concrete-filled steel pipes used in coastal and offshore areas have serious corrosion problems. Currently, the common anti-corrosion measures are usually galvanized or painted. However, anti-corrosion materials will lose a certain amount every year. After a certain number of years, they need to be re-galvanized Or paint, the economic consumption is larger. Due to the increasing shortage of river sand resources, sea sand concrete made of sea san...

AI Technical Summary

Problems solved by technology

However, the chloride ions in sea sand can catalyze the corrosion of steel bars, so the sea sand used in engineering must strictly control the chloride ion content. If it is not handled properly, it will lead to serious durability problems for the structure, causing serious economic losses and safety. Hidden danger

When the steel pipe is filled with sea sand concrete, because the concrete is in a closed environment, the oxygen and water required for chloride ion corrosion of the steel pipe cannot be replenished, and the corrosion degree is gradually weakened.

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