国产,日韩欧美一区二区-国产 av 仑乱内谢-欧美人禽杂交狂配-17岁中国高清免费观看完整版

The four advantages of determining the development direction of steel structure are introduced as follows:

The advantage of steel output under current national policy

Before the 1980s, China produced a small amount of steel, and the state advocated "less use" of steel. China's iron and steel production is constantly increasing, we should promote the "rational use of steel." In the 1990s, China's steel output ranked first in the world. But because the technology of steelmaking in our country is unceasingly backward, we can't make good steel. For this, the country begins to popularize, support to use steel, established the steel group that USES jointly.

Manual manufacturing costs are low

For large buildings, steel structure is undoubtedly the best choice, and high and low buildings have steel structure and concrete structure of two choices. However, with the new generation of young migrant workers prefer to choose low pay, more decent work concept changes and the state pay attention to the issue of migrant workers wage arrears, there is a phenomenon of migrant workers pay settlement on the same day, the payment of cash, concrete construction labor costs continue to increase. In this case, the steel structure with low technical content and simple operation requires much lower labor cost.

Import embarrassing situation under the strategic reserve

China's iron ore is mostly lean ore, can only import a large number of iron ore from Australia. In order to reduce the pressure on imports, China has gradually implemented the steel reserve strategy, turning steel into a reality. Among them, steel structures are favored for their high recovery rate.

Green advantage of steel structure building materials

Concrete structural materials will become construction waste after 50 years, but steel structures can be recycled for use, plus the weight is more reasonable, seismic performance is good, can be welded, can be closed and other advantages, the development of steel structures is the only way.