Grating: Zha, initial zh, vowel A, four tones.

Board: class, initial b, final an, three tones.

Steel has high strength and high elastic modulus. Compared with concrete and wood, the ratio of its density to yield strength is relatively low, so under the same stress conditions, the steel structure has small cross section, light weight, convenient transportation and installation, and is suitable for structures with large span, high height and heavy load.

Hand-made steel grating has pressure locking, welding, interlocking and welding-free. Hand-welded steel grating is to drill holes or slots in flat steel, and then put the cross bar into the holes for spot welding, so that there will be a gap between the cross bar and the flat steel, and each contact point between the cross bar and the flat steel is welded, and the cross bar can also be spot welded at intervals.

Flexible production technology and diversified products can basically produce a full range of steel grating plates, which has advantages in heavy duty; Because all welding is manual, weak welding, missing welding and false welding are easy to occur, which leads to false welding and missing welding reducing strength.

Extended data:

The upstream of steel structure is mainly the steel industry, and the price fluctuation of steel directly affects the procurement cost of this industry. On the whole, the upstream industry is basically a competitive industry, producing all kinds of steel for steel structures, such as steel plates, pipes and profiles, among which H-beams and medium plates are the most commonly used products in steel structures. Industrial insight research data: the crude steel output of 20 1 1 year reaches 696 million tons, and the output is relatively saturated, so the raw materials needed for steel structure production can be stably supplied.

Iron and steel industry is the material basis for the development of steel structure industry, and the technological progress of iron and steel industry has created favorable conditions for the application of steel structure. Some large enterprises in the domestic steel industry began to research and develop varieties and technologies of steel for building structures, and successively developed high-strength steel and steel with fire resistance, weather resistance, seawater resistance, delamination tear resistance and low temperature resistance, as well as H-beam, high-performance color coated steel plate and cold-formed steel beam, which laid a good application foundation for the development of steel structure industry.

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