With the rapid advancement of urbanization, the newly added population of the city is growing rapidly, and the demand for housing is extremely urgent. The industrialized production of steel structure houses will become the first choice. The authoritative department predicts that by 2015, steel-structured houses will account for 15%-20% of the total housing construction in the country.

 

After nearly 20 years of development and construction, China's steel-structured houses have been struggling and have low marketization, with an annual construction volume of less than 1%. In particular, the Tangshan, Wenchuan, and Yushu earthquakes caused huge losses in life and property, and challenged the safety performance of China's housing construction system and structure. The good seismic performance and many advantages of steel structure houses are obvious to all. Starting from the advanced concepts of green, environmental protection, recycling and sustainable development, the state should vigorously promote the development of steel-structured houses.

 

Development and application of steel structure residential buildings

 

At present, China's resource shortage is becoming more and more serious. Steel structure can be recycled due to steel recycling, which saves a lot of resources. The state should encourage steel structure houses and give appropriate subsidies to investors or developers. After the steel structure buildings reach the service life, the country Recycling scrap or recycling to achieve strategic resource reserve purposes.

 

Key enterprises and innovative features of steel structure residential development

 

In recent years, a large number of steel structure residential research and development work, including engineering pilots, industrialization promotion, parts matching and green building certification, have been carried out in design, research, colleges and government departments, steel, steel structures, real estate enterprises, etc. Many local governments, real estate developers, and investors recognize it, but its development area and scope of promotion are far from enough.

 

In order to develop steel-structured houses, enterprises such as Baosteel, Cypress, Hangxiao Steel and Laiwu Steel, which have been working hard, have been at the forefront of the industrialization of steel structure housing. Local governments such as Beijing, Shanghai, Tianjin, Chengdu, Jinan, Shenyang, and Anshan have also given a lot of support and investment. At this point, steel-structured houses have achieved certain achievements, and hundreds of steel-structured houses have been built and put into use nationwide. Ten thousand square meters.

 

The World Steel Association organizes 10 key steel companies in the world to develop steel-structured houses. Baosteel represents China and participates in a large number of funds and researchers. The development of steel-structured houses suitable for densely populated countries such as China, India, and South Africa, and the collection of excellent programs around the world have been carried out three times. At present, significant progress has been made in the resettlement houses in Dujiangyan, Sichuan, the Wuhan Economic Housing, and the Shenyang Housing Project.

 

The United Nations expects global urbanization to reach 70% by 2050. In the past 20 years alone, there are 3 million new urban populations in developing countries every week. It is predicted that the demand for housing and infrastructure services will increase by 40% by 2030 compared to 2005. This means that in the next 21 years, more than 4,000 housing units per hour will be able to meet this demand, which is almost an impossible task. Although the data is so shocking, they also give the construction industry a huge opportunity to wait for them.

 

In view of the development opportunities faced by steel-structured houses, China Steel Structure Association pointed out in the “12th Five-Year Plan” regarding the planning of steel-structured houses, promoting the overall improvement of the quality of steel-structured houses and strengthening the earthquake-resistant, wind-resistant and corrosion-resistant steel structures. Research and development of fire resistance and structural safety and health monitoring. Improve the service life and actual life of the building, and promote the research and development of related supporting products. By 2015, the steel structure housing construction will account for about 15% and 20% of the total national building construction.

 

In the past ten years, the Ministry of Housing and Urban-Rural Development, the Ministry of Science and Technology, and central and local governments such as Beijing, Shanghai, Tianjin, Hubei, Shandong, Hebei, Zhejiang, and steel, steel structures, and real estate companies have all developed and applied steel-structured houses. The commercial buildings, affordable housing, housing projects, post-earthquake reconstruction of residential buildings, and key technologies for steel-framed houses have all made good progress and have been unanimously recognized by society, enterprises and users. This shows that steel-structured houses have broad market prospects. .

 

In recent years, relevant national departments have issued a number of standard specifications, such as the "Notice on Advancing the Modernization of Housing Industry to Improve Housing Quality", "Technical Guidelines for Industrialization of Steel Structure Residential Buildings", "Code for Design of Steel Structure Residential Buildings", etc. . In addition, the Wenchuan earthquake has brought development opportunities to steel-structured houses. According to the guiding ideology of the “National Wenchuan Earthquake Reconstruction Plan”, urban and rural residents must live in safe, economic, practical and provincial housing. However, the current new residential buildings are still dominated by reinforced concrete structures and brick-concrete structures, and only some of them use steel structures. These steel structure buildings are basically subsidized or aided by steel structure enterprises, and the provinces and cities that support the construction of the provinces have lost the opportunity to promote the application of steel structure houses due to technical reserves, cost, and construction period requirements. The three-year plan for post-disaster recovery and reconstruction in Sichuan Province is about to be completed in two years. It is estimated that the investment will be more than 1 trillion yuan. It is estimated to consume 370 million tons of cement, 37 million tons of steel, and 2100 trillion standard bricks for wall materials.

 

Analysis of the disadvantages of developing steel structure housing

 

Steel structure houses have mature experience in developed countries, and have been used for more than 20 years in China. At present, there have been relatively successful experiences and engineering examples from construction technology, structural systems, building product support to design, construction, and enclosure, including the construction of steel-structured residential quarters. In this case, why steel-structured houses have not been recognized by the market and users for a long time, for many reasons, mainly as follows:

 

First, it is technical and policy aspects, technical standards and norms are not perfect; the quality and price of supporting products and parts are uneven; the industrialization and standardization of component parts are insufficient; the policies and regulations encourage insufficient support; the independent development and innovation are weak and the investment is too small.

 

Second, in the market economy, advanced construction technology and products and traditional, extensive, backward construction technology and products have markets, and the irregular market order seriously affects the quality of construction projects and design service life; direct use of steel structures, The long-term comprehensive economic benefits of the society have not been fully recognized, and the acceleration of the construction period and the increase of the use area have become the benefits of developers and investment enterprises. Vigorously developing green and environmentally friendly housing is a long-term national strategic policy that enterprises will not consider.