"A new type of building system is likely to break through the industrial boundaries between the real estate industry, construction industry, metallurgy industry, machinery and equipment manufacturing industry, and national strategic resources, and become a new industrial system. This is the steel structure that is widely favored by the industry. Building system.” This is the keynote speech of “The Steel Structure and Green Building” by the president of Zhejiang Steel Structure Industry Association and the chief engineer of Hanjia Design Group Co., Ltd. Fang Hongqiang at the 11th National Symposium on Modern Structural Engineering.

 

Steel structure and green building

 

Fang Hongqiang, chief engineer of the Design Group, president of the Zhejiang Steel Structure Industry Association, experts of the China Building Metal Structure Association Building Steel Structure Committee and experts of the China Steel Structure Association, has a deeper understanding of steel structures than ordinary people. Fang Hongqiang believes that steel structure is the main representative of green buildings.

 

Fang Hongqiang said that the promotion of steel structure in the field of construction engineering 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 construction not only has four excellent performances of “light, fast, good and economical”, but also has the advantages of being recyclable and having less damage to the environment. As we all know, steel structure has 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, The influence of construction season and low comprehensive cost, steel structure can also reduce the pollution of construction waste to the environment, and can be recycled during the whole life cycle. Fang Hongqiang said that steel structure construction is in line with the development direction of China's energy conservation and emission reduction and circular economy, and is one of the structures that have the least impact on the urban environment.

 

According to Fang Hongqiang, steel structures have been widely adopted in developed countries, so they are called the main representatives of green buildings. Europe calls green buildings ecological or sustainable. China's green building means maximizing resource conservation (energy saving, land saving, water saving, material saving), protecting the environment and reducing pollution during the whole life cycle of the building, providing people with healthy, applicable and efficient use space. A building that is in harmony with nature. The development of green buildings has been clearly written into the country's “Twelfth Five-Year Plan”, which is the first time green buildings have entered national planning.

 

Fang Hongqiang believes that the core value of architecture is to protect people's lives. Japan’s “3.11” strong earthquake once again warned us that a large number of house damages and casualties were caused by a more destructive tsunami, rather than a collapse of houses, which has a higher share of Japan’s steel construction and Japan’s attention. Buildings are directly related to disaster prevention, disaster prevention, and safety design for life care. Fang Hongqiang stressed that in the face of the common disaster of mankind, we have no reason not to learn from, not to be alert, not to reflect.

 

Defects of traditional structural buildings

 

When talking about the defects of reinforced concrete structures and masonry structures, Fang Hongqiang said that due to the manual operation of reinforced concrete structures and masonry structures, the construction of wet construction on site, the noise and dust generated during construction have seriously jeopardized the health of employees. . More importantly, the reinforced concrete structure and masonry structure of the building materials can be very low in recycling rate, and the environmental pollution caused by construction waste after the life cycle, and the adverse effects on future generations have caused many domestic Widespread attention and widespread concern from outside experts.

 

Chen Yuyuan, an academician of the Chinese Academy of Engineering and a professor at Tsinghua University, said with anxiety: "The high-quality mineral materials used for firing cement have been in short supply. The sandstone for preparing concrete has been very tight in many places. The sand and gravel in some areas have seriously damaged the riverbed and destroyed vegetation. Coastal areas such as Ningbo and Zhoushan have brought major safety hazards to some projects due to the abuse of sea sand.” Waste vehicles can be used to build steel structures.

 

Fang Hongqiang not only has rich theoretical knowledge, but also has rich engineering practice experience. As the chief designer of the design of the Baotou Wanjun Daducheng residential project, the largest steel structure residential area currently under construction in China, Fang Hongqiang is very optimistic about the industrialization of steel structure construction.

 

Fang Hongqiang pointed out that steel structure should firmly establish the design concept of green building: according to the concept of “zero resource, zero energy consumption, zero emission, zero pollution, zero site, zero distance”, from planning, design, construction, use to demolition A new model for the development and construction of the entire life cycle of a building, developing, designing and building a new generation of modern steel-structured residential building products that meet industrialization, standardization and industrialization.

 

Fang Hongqiang used a three- to four-story ordinary multi-story frame structure to compare steel structure and wood structure. If wood structure is used, it is generally necessary to use 40 to 50 trees of about 10 years old; and for steel structures, only 6 pieces of steel for scrapped cars are used. Fang Hongqiang said that with the popularization of automobiles, the problem of “end-of-life vehicles” after “difficult roads and difficult parking” will also appear. It is a good choice to “digest” scrapped cars with steel structures. Comparison of steel structure buildings at home and abroad

 

Fang Hongqiang said that in 2009, China's construction of steel consumption accounted for about 50% to 60% of all steel production, which is equivalent to the average consumption of world steel. However, the consumption of steel in China's buildings is mainly used for steel bars, steel wires and steel strands in reinforced concrete. In the true sense, steel for steel structure construction 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% to 60%. In Japan, steel structures account for about 50% of the total construction; in South Korea, steel structures account for about 20% of the total construction. It can be seen that the steel quantity of steel structure construction in China is seriously low, which has formed a huge contrast with the rapid growth of China's steel production, which is also a major cause of the oversupply of steel in China.

 

The status quo and trend of steel structure in China

 

Fang Hongqiang believes that the Chinese are not good at using steel because China was once a country with severe steel shortage. According to the latest data, in 2010, China's steel output was more than the total of the second to the 10th countries in Japan and the United States, accounting for 43.3% of the world's steel production. The continuous growth of China's steel output has laid a solid foundation for the development of China's steel structure.

 

Fang Hongqiang believes that at present, China has fully developed the basic conditions for the construction of steel structures. First, the "standards", "norms" and "regulations" have been basically improved; second, the design tools (software) are complete; third, they have technical research and Product development capability; Fourth, a complete staff education and training mechanism has been formed in China.

 

Fang Hongqiang said that at present, there are more than one thousand steel structure manufacturing enterprises in China, and the manufacturing, construction and installation capabilities have been improved. Taking Zhejiang Province as an example, there are dozens of well-known steel structure manufacturing and construction enterprises such as Seiko, Southeast, Hangxiao and Hengda, and their equipment level and production technology management and management capabilities are close to the international level.

 

Fang Hongqiang said that based on technological innovation, reforming the traditional building system, promoting the industrialization, standardization and matching of steel structures, promoting the development and application of steel structures in engineering construction, protecting the earth's ecological resources with steel, and replacing concrete with steel structures; Structure and promotion of green and environmentally friendly buildings have become new methods and new ideas for sustainable development in the field of engineering construction.

 

Fang Hongqiang believes that at present, the combination of steel structure construction and China's affordable housing construction can not only solve the problem of housing difficulties for the people during the 12th Five-Year Plan period, but also solve the employment problem of overcapacity caused by overcapacity of steel. Fang Hongqiang said that in the long run, due to the relative lack of high-quality iron ore resources in China, the grain of modern industrial industry, steel, will surely become a bottleneck restricting China’s strides toward modernization, while the construction of a large number of steel structures is Very valuable quality resources. Fang Hongqiang said that the combination of steel structure construction and China's urbanization construction and affordable housing construction is actually a long-term strategic reserve industry of the country, which can benefit future generations and its significance is even more significant.