New Technology of Erection of Green Building with Steel Structure Reflects Energy Saving and Environmental Protection

Steel structure is closely related to green building

At the 11th National Symposium on Modern Structural Engineering held a few days ago, Fang Hongqiang, an expert member of the Building Steel Structure Committee of China Construction Metal Structure Association, said: "A new type of building system may break through the industry boundaries among real estate industry, construction industry, metallurgy industry, machinery and equipment manufacturing industry and national strategic resources, and form a new industrial system, this is the industry generally optimistic about the steel structure building system."

Fang Hongqiang believes that steel structure building is the representative of green building. The promotion of steel structure is an important part of the development of circular economy in the construction industry, and it is the transformation and upgrading of the traditional civil construction industry. Steel structure building not only has the excellent performance of "light, fast, good and province", but also has the advantage of recycling. Steel structure has the advantages of high strength, light weight, good seismic performance, low foundation cost, large building area, high building quality, suitable for industrialization and standardized production, dry green construction, suitable for different climatic conditions, free from the influence of construction season, low comprehensive cost, etc, At the same time, steel structure can also reduce the pollution of construction waste to the environment, and can be recycled in the whole life cycle. Fang Hongqiang said that steel structure buildings are in line with the development direction of my country's energy conservation, emission reduction and circular economy, and are one of the structures with the least impact on the urban environment.

According to Fang Hongqiang, steel structures have been widely used in developed countries and are known as the main representative of green buildings. In Europe, green buildings are called ecological buildings or sustainable buildings. China's green building refers to a building that maximizes resource conservation (energy saving, land saving, water saving, and material saving), protects the environment and reduces pollution, and provides people with healthy, applicable and efficient use of space. Buildings that coexist harmoniously with nature. The technical advantages of

steel structure buildings are obvious

The average life span of European and American buildings is more than 80 years. In contrast, the average life span of buildings in China is only 30 years, which is less than 60% of the minimum service life of the national standard. In the process of repeated construction, my country has created two world firsts: while consuming the world's most cement and steel, it also produces the world's most construction waste-up to 0.4 billion tons per year, and the amount of construction waste has accounted for waste. 30% ~ 40% of the total. Construction waste is piled up and landfilled around the city, falling into the situation of "garbage siege". It not only occupies the land, but also contains various harmful chemicals, which seriously corrodes the surface and pollutes the underground water source, which is extremely harmful and poses a threat to the living environment of human beings. In addition, the construction waste also separated the city's historical context, weakened the city's cultural heritage, and destroyed the city's style.

Fang Hongqiang pointed out that because the reinforced concrete structure and masonry structure buildings need manual operation, the noise and dust generated during the wet construction on site seriously endanger the health of employees. More importantly, the recycling rate of building materials for reinforced concrete structures and masonry structures is extremely low, and the environmental pollution caused by the construction waste generated after reaching the life cycle and the adverse effects on future generations have caused domestic and foreign Experts are widely concerned and generally worried. In addition, there is a shortage of high-quality mineral materials for firing cement, and the sand and gravel for preparing concrete are already very tight in many places. In some areas, the mining of sand and gravel has seriously damaged the river bed and destroyed the vegetation.

Fang Hongqiang proposed that steel structure buildings should firmly establish the design concept of green buildings: according to the concept of "zero resources, zero energy consumption, zero emission, zero pollution, zero construction site and zero distance", establish a new model of life cycle development and construction of buildings from planning, design, construction, use to demolition, develop, design and build a new generation of modern steel structure residential building products that meet industrialization, standardization and industrialization.

Compared with traditional civil construction methods, steel structure buildings have four excellent properties of "light, fast, good and economical. The ratio of steel bulk density to strength is less than that of concrete and wood. Under the same conditions, the overall weight of the building using steel structure is the lightest. Steel structure is easy to manufacture mechanically, with high accuracy, convenient installation and short construction period, which is the most industrialized structure in engineering structure. Steel structure has little damage to the environment, good seismic performance and is suitable for different climatic conditions and atmospheric environment; the use of steel structure can also save the cost of foundation, can save water, easy to control the cost, at the same time, can also be reused, reduce construction waste.

He used a 3-to 4-story ordinary multi-story frame structure building to compare the steel structure building and the wood structure building. "If the wooden structure is used, it is generally necessary to use 40 to 50 trees of wood with an age of about 10 years; while the steel structure is used for steel construction, only the steel of 6 scrapped cars is needed." Fang Hongqiang said. In recent years, several earthquakes with great destructive power have occurred in the world, which highlights the most important advantage of steel structure buildings-good seismic performance. Judging from the actual situation in China, the promotion of steel structure houses in post-disaster reconstruction has no greater pulling force on the recovery of the local economy than concrete buildings, because steel structure houses are produced in factories and assembled on the construction site, which can save a lot of labor.

The development of steel structure buildings is the general trend

According to Fang Hongqiang, in 2009, China's construction consumption of steel accounted for about 50% ~ 60% of the total steel output, which is equivalent to the average consumption level of steel in the world. However, the consumption of steel in China's construction is mainly used in reinforced concrete steel, steel wire, steel strand, etc., the real sense of steel structure construction steel only accounts for about 10%. In China's housing construction, the construction area of steel structure buildings accounts for about 2%, while the construction area of developed countries accounts for 40% ~ 60%. In Japan, steel structure buildings account for about 50% of the total construction; in South Korea, steel structure buildings account for about 20% of the total construction. It can be seen that the steel consumption of steel structure construction in China is seriously low, which forms a huge contrast with the rapid growth of steel production in China, which is also a main reason for the overall oversupply of steel in China.

He pointed out that the latest data show that in 2010, China's steel output was more than that of Japan, the United States and other countries ranked 2nd to 10th combined, accounting for 43.3 percent of the world's steel output. The continuous growth of steel production in China has laid a solid foundation for the development of steel structure buildings in China.

Fang Hongqiang pointed out that at present, the combination of steel structure construction and China's affordable housing project construction can not only solve the housing problem of ordinary people during the "Twelfth Five Year Plan" period, but also solve the employment problem of labor surplus caused by steel overcapacity. Fang Hongqiang said that in the long run, due to the relative lack of high-quality iron ore resources in China, steel, as the "food" of modern industry, will become the bottleneck restricting China's great strides towards modernization, and a large number of steel structure buildings are very valuable high-quality resources. Fang Hongqiang said that the combination of steel structure construction with my country's urbanization construction and affordable housing construction is actually a country's long-term strategic reserve industry, which can benefit future generations and is of great significance.