Prefabricated steel frame for corrosion-resistant bridge and manufacturing method thereof

Abstract

The invention discloses a corrosion-resistant prefabricated steel frame for a bridge and a manufacturing method thereof. The prefabricated steel frame is made of austenitic stainless steel, a pressurestress layer is solidified on the surface of a base body of the prefabricated steel frame, and residual pressure stress of the pressure stress layer is not lower than 500 Mpa; the outer surface of the pressure stress layer is coated with a nickel layer with the thickness 0.03-0.05 mm in a plated mode; and the outer surface of the nickel layer is coated with a cadmium layer with the thickness 0.08-0.12 mm. The manufacturing method comprises the steps that the austenitic stainless steel base serves as a raw material, hot-rolling for rough forming is conducted after casting, and then cold rolling is conducted multiple times for final forming; then mechanical finish machining is conducted till the required size is achieved; and surface-layer shot blasting is conducted, and the cadmium-nickelcomposite plating layers are plated on the surface. The corrosion-resistant prefabricated steel frame for the bridge is high in strength, good in roughness, pretty high in corrosion-resistant capacity, and high in anti-fatigue capacity.

Description

Technical field [0001] The invention relates to the field of bridges, in particular to a prefabricated steel frame for corrosion-resistant bridges and a manufacturing method thereof. Background technique [0002] Steel bridge (steel bridge), the main load-bearing structure adopts steel bridge, namely steel structure bridge, steel bridge. Fabricated steel bridges have been widely used all over the world. The original fabricated steel bridge was designed by the British engineer Donald Bailey at the beginning of World War II in 1938. The main design concept is to assemble the minimum types of unit components into a prefabricated steel bridge that can carry various loads and different spans, and only needs to be transported by ordinary medium-sized trucks. Under special circumstances, it can be built entirely by manpower. [0003] According to related research, the failure modes of steel structure bridges mainly include: due to long-term heavy-duty vehicles to fatigue fracture of the...

AI Technical Summary

Problems solved by technology

[0004] In the relevant patents that have been applied for in China, there are no materials and methods to improve the corrosion resistance of bridge prefabricated steel frames. They are only improved structurally, but the surface integrity design is not adopted in the structure. The manufacturing materials are generally carbon steel or carbon steel. For low-alloy steel, paint is generally used for anti-corrosion treatment, and pre-stress is generally used for anti-fatigue treatment. Such a prefabricated steel frame itself has poor mechanical strength and toughness, and the paint itself will fall off in the natural environment, and its bonding force with the substrate is also weak. The prestressing mode is too targeted, and it is generally obtained by directly changing the prefabricated steel frame structure, which actually directly reduces the fatigue limit and fatigue life of the prefabricated steel frame