Steel strand inhaul cable with polyurea protective material on outer layer and manufacturing method of steel strand inhaul cable

Abstract

The invention relates to a steel strand inhaul cable with a polyurea protective material on an outer layer. The steel strand inhaul cable comprises a steel strand combination formed by n steel strands, the outer layer of the steel strand combination formed by the n steel strands is coated with a polyurea protective coating I to form a steel strand inhaul cable body Ia with the polyurea protective material, and the outer layer of a wrapping and packaging belt of the steel strand inhaul cable body Ia is coated with a polyurea protective coating II to form a steel strand inhaul cable body Ia0b. A manufacturing method of the steel strand inhaul cable includes the steps that a series steel strand inhaul cable which has multiple protective functions is manufactured through one or more of the polyurea material coating process I, the wrapping and packaging process, the polyurea material coating process II, the extrusion molding process, the polyurea material coating process III and the like of the steel strand combination obtained after the steps of pretreatment, drying and coalescence molding. The method is simple and convenient; the manufactured steel strand inhaul cable is good in tension-resisting strength and flexibility, high in damping and good in ageing resistance, wear resistance and damping performance; the corrosion prevention capacity of the steel strand inhaul cable can be greatly improved, and the service life of the steel strand inhaul cable can be prolonged; and the n is larger than or equal to 1.

Description

technical field [0001] The invention relates to a drag cable and a manufacturing method thereof, in particular to a steel strand drag cable with a polyurea protective material on the outer layer and a manufacturing method thereof. Background technique [0002] Cables are the core components of cable-supported bridges and buildings. The design life of bridges and buildings as basic engineering is 70 years or even more than 100 years, while the service life of current steel strand cables is only 20 to 30 years. Cable-supported bridges and buildings need to change cables many times during use, and the cost of changing cables is high and affects the use. Therefore, the steel strand, which is the unit component of the steel strand cable, needs a new structural form to ensure its high durability. [0003] The steel strand is usually twisted by the center wire and the side wire. At present, there are generally two types of anti-corrosion steel strands. The first is to directly coa...

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Problems solved by technology

[0005] 1. The coating is easy to crack and fall off, and it is also easy to produce pinholes, so the steel strand is easily corroded, which affects the service life of the steel strand;

[0006] 2. Since the coating of the overall coated steel strand is thermosetting epoxy resin, the coated steel strand has high rigidity and poor bendability, and the epoxy resin will have aging phenomenon after long-term application, and its wear resistance is poor.

[0007] In addition, galvanized, galvanized aluminum and other steel strands adopt the anticorrosion method of sacrificial medium, which is not easily affected by local defects such as pinholes, but its coating is easy to wear and tear, so its service life is generally not particularly long; therefore, prestressed steel strands Anti-corrosion is a major issue related to the quality and life of bridge engineering. Feasible anti-corrosion measures must be strengthened for prestressed steel strands to reduce the huge losses caused by early failure of prestressed steel strands due to corrosion.

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