Products Description
Carbon steel used in bridge construction has A3q for riveting bridge structure and 16q for welding bridge structure; Low alloy steel for bridge structure is 12Mnq, 12MnVq, 15MnVNq, 16Mnq and so on. The surface of the bridge steel plate should not have cracks, bubbles, scars, folds, inclusions, and steel should not be layered. The surface defects of the bridge steel plate are allowed to be cleaned, and the cleaning depth should not be greater than half of the thickness tolerance of the steel from the actual size, and the thickness should be guaranteed, and the cleaning place should be smooth without edges.
This steel plate also has a lot of advantages, its construction is fast, and very simple, do not need to increase the section size and weight of the reinforced member. And its end anchorage is very important, if not handled properly, it will cause avulsion phenomenon, a brittle failure.
Moreover, when the original component is in a state of high stress, it is suitable to use the unloading method, if the temperature of the base is below five degrees Celsius, the use of steel bonding method needs to be supplemented by heating measures to speed up curing. The construction of negative moment section of frame joints is difficult to deal with, so it is suitable to adopt the local amplitude modulation method, and attach the bottom of the beam first. When appropriate amount of aluminum is added to bridge steel plate, the surface of slab and finished product is easy to form transverse cracks. Attention must be paid to the matching process of drawing speed, cooling water and straightening temperature of continuous casting.
Bridge steel plate is mainly used for building railway Bridges, highway Bridges, cross-sea Bridges and so on. It is required to have high strength, toughness and withstand the load and impact of rolling stock, and to have good fatigue resistance, a certain low temperature toughness and atmospheric corrosion resistance. Welded bridge steel should also have good weldability and low notch sensitivity.
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