Foreword: In 2009, China's urbanization rate was 46%, urban population was 622 million, rural population was 713 million, and about 250 million migrant workers were working in township enterprises and going out to work. The national housing construction area is 3.2 billion square meters, of which the residential construction area is 2.5 billion square meters, and the commercial housing investment is 2.56 trillion yuan. Such a large number of people's demand for housing and a broad market are the pillar industries of the national economy that are of great concern to government departments, construction industries and related materials, parts, and decoration enterprises. They are also the people's heart project, the performance project, and the well-off sign. 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 huge loss of life and property caused by the Tangshan and Wenchuan earthquakes has placed an extremely important and revolutionary issue on China's housing construction system and structural safety performance. At present, there are sufficient steel raw materials and it is a major steel country in the world. Starting from the advanced concepts of green, environmental protection, recycling and sustainable development, we should encourage the development of steel-structured houses. This is China and local governments, steel structure industry associations, societies, steel structures. Historical responsibility of the industry and related industries and enterprises.

Development and application of steel structure residential buildings

In the past 10 years, the Ministry of Construction, the Ministry of Science and Technology, and central and local governments such as Beijing, Shanghai, Tianjin, Hubei, Shandong, Hebei, and Zhejiang, as well as steel, steel structures, and real estate companies have all developed and applied steel-structured houses, including commerce. Economic housing, housing projects, and post-earthquake reconstruction. As well as the key technologies, supporting components and design specifications and standards of steel structure houses, they have made good progress and have been recognized by the society, enterprises and users, indicating that the steel structure houses have huge and potentially broad market prospects.

Steel structure housing policy and standard specifications

1. Notice on Several Opinions on Promoting Modernization of Housing Industry and Improving Housing Quality. State Administration 1998.8.20

2. Notice on Printing and Distributing the Technical Guidelines for Industrialization of Steel Structure Residential Buildings, Document No. [2001] No. 254 of the Ministry of Construction;

3. "Technical Regulations for High-rise Civil Building Steel Structures" JGJ99-98

4. “Design Rules for Steel Structure Residences” CECS261--2009;

5. Standard for the Ministry of Construction of the Technical Requirements for Low-rise Light Steel Structure-Assembly Residential Buildings JG/T182-2005

6. "Technical Regulations for Multi-story Steel Structure Residences in Shanghai" DJ08-2029-2007

7. Technical Regulations for Light Steel Structure Residences JGJ209--2010

8. "Tianjin Steel Structure Residence Design Regulations" DP29-57-2003

9. Technical Guidelines for Laigang Steel Structure Green Energy-Efficient Residential Building System JD14-002-2006

10. "Code for Design of Steel Structures" GB50017-2003

Steel structure residential superiority and characteristics

1. Light weight, high strength, good earthquake resistance, adapt to structural changes and architectural appearance;

2, factory production, can achieve component standardization, modularization, high precision, large scale

3. The construction and installation speed is fast, reducing wet operation, saving energy and land, and reducing the general labor service;

4. Light weight, reduced wall, beam and column area, which can reduce basic cost, increase the use area, space utilization and facilitate pipeline layout;

5, less pollution, easy to repair and renovate and can be recycled, in line with low carbon, energy saving, environmental protection and sustainable development requirements.

Green building 6 standards

1. The planning and design is reasonable, and the building is in harmony with the environment;

2, the maintenance structure is insulated from the cold, the doors and windows are closed, and the specifications are met;

3, heating, cooling and burning, etc., try to use clean energy, sunshine 2,500 hours / year, should arrange to use solar energy;

4, drinking water meets the standard, drainage depth purification, circulation (water use);

5. The decoration is simple and applicable, and the chemical pollution is lower than the environmental emission index;

6, enough outdoor activity space, greening is not less than 40%, no exposed surface.

Opportunities for rebuilding house and steel-framed homes after the Wenchuan earthquake

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. Involved in the disaster-stricken areas of Sichuan, Gansu and Shaanxi, the planning and construction needs are as follows: urban construction of 66.210 million square meters (85,900 sets, including 86,000 sets of low-rent housing); supporting public construction of 3.869 million square meters; rural new construction of 3.289 million (1315.87) However, the newly built houses are still mainly reinforced concrete structures and brick-concrete structures, and only some schools and houses use steel structures. These steel structure buildings are basically subsidized or aided by steel structure enterprises, and the implementation of the provincial and municipal planning and implementation of the counterparts has lost the opportunity to promote the application of steel structures due to the reality, technical reserves, cost, and construction period requirements.

Three-year plan for post-disaster recovery and reconstruction in Sichuan is about to be completed in two years

It is estimated that the investment will be more than 1 trillion yuan. It requires 370 million tons of cement; 37 million tons of steel; 2100 trillion standard bricks for wall materials.

Analysis on the problems and reasons of the current promotion and application of steel structure housing

Steel structure houses have mature experience in developed countries, and the application development time in China has been more than 20 years old. At present, there have been relatively successful experiences and engineering examples from construction technology, structural systems, construction product matching, design, construction, maintenance, etc., including the construction of steel structure residential quarters. Why has it not been recognized by the market and users for a long time, for many reasons, mainly in the following two aspects: First, technical and policy aspects, 1, technical standards, norms are not perfect; 2, supporting products and parts quality, price is uneven 3. Insufficient industrialization and standardization of component parts; 4. Insufficient support for policies and regulations; 5. Insufficient development and innovation, too little investment. Second, the market economy, 1, building advanced technology, products and traditions, extensive, backward technology, products have markets, and non-standard market order, low-cost competition, leading to and seriously affect the quality of construction engineering and design service life; 2. The direct and long-term social comprehensive economic benefits obtained by using steel structures, such as saving the foundation, accelerating the construction period, and increasing the use area, become the benefits of developers and investment enterprises. Green environmental protection and circular economy are the country's long-term strategic policy, which is often not considered by enterprises. There are short-term behaviors from planning and design and are considered to be high in steel construction costs. 3. The current national strength is strong, and the shortage of resources is becoming more and more serious. It is entirely possible to encourage the use of steel structures and give appropriate subsidies to investors (equivalent to borrowing). After the steel structure buildings reach the end of their useful life, the state recycles scrap or reuses them. Achieve the goal of strategic resources reserve.

The industrialization development of steel structure housing is a challenge and opportunity for enterprise science and technology personnel

1. Steel structure houses can meet the needs of domestic and foreign residents and coordinate with environmental protection;

2. Give full play to the superiority of steel structure, further improve the technology and standards of steel structure housing and promote the promotion of support policies to promote the recognition of the government, the market and users;

3. Develop and research steel structure building systems suitable for rural, urban, and public buildings. Creating a new type of industrialized, standardized, and advanced steel structure construction industry is the direction of historical responsibility and independent innovation. It is also the best time and opportunity to build a modern Chinese steel structure.

Key enterprises and innovative features of steel structure residential development

In the past 10 years, a large number of research and development work on steel structure houses have been carried out in design, research, colleges and government departments, steel, steel structures, real estate enterprises, etc., including engineering pilots, industrialization promotion, accessory parts matching and green building certification. It has won the recognition of many local governments, real estate developers and investors. However, its development area and scope of promotion are far from enough.

We have been adhering to and constantly working hard, such as Baosteel, 賽博斯, Hangxiao Steel Structure, Laigang Construction, etc., which are in the forefront of the industry in terms of industrialization. Local governments such as Beijing, Shanghai, Tianjin, Chengdu, Jinan, Shenyang, and Anshan have given a lot of support and investment, and steel structure houses have achieved certain achievements. The country has been built and put into use for millions of square meters.

World Steel Association and China Baosteel

The World Steel Association organizes 10 key steel companies in the world to develop steel-structured houses. China Baosteel represents China and invests a large amount of funds and researchers.

The goal is to solve the growing housing needs of the population; increase the consumption of steel; promote green, environmentally friendly, comfortable and healthy housing.

The development of a steel-structured dwelling suitable for densely populated, factory-produced production in China, India, South Africa, etc., has been launched three times.

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 over the next 21 years, more than 4,000 homes per hour will be needed to meet this demand – a task that is almost impossible. Although the data is so shocking, they also give housing design and construction industry a huge opportunity to wait for them.

Baosteel House Recycling and Reuse Baihua Village Pilot Project

Building area: 183.1 square meters

Structural system: steel frame structure

Construction site: Guankou Town, Dujiangyan

Recycling board room: 400 square meters

Hangxiao Steel Structure

Hangxiao Steel is committed to multi-story steel structure housing construction for many years, and has been widely promoted and applied in Hangzhou, Wuhan, Angola, etc., and has been well-supported in industrialization, slabs and wallboards, and has been recognized as a residential industrial base and energy-saving province by relevant state departments. Building.

Beijing Cybers Architectural Design Co., Ltd. Wuhan Steel Structure Economic Housing

The company is one of the earliest companies to try out the development of steel structure housing. It has been innovating for more than 10 years, developing industrial market, participating in the preparation of standard specifications and cooperating with Baosteel to jointly develop steel structure houses.

Ma Steel Steel Structure Residence

Maanshan Iron and Steel Co., Ltd. took the lead in the construction and production of hot-rolled H-beams in China, which were used in housing construction and exported to foreign countries. In 2001, in order to promote the development of steel structure housing, the steel structure house with H-shaped steel frame structure system was independently developed and designed. Many new technologies and advanced products have been adopted, and the users have responded well.

Laigang Steel Structure Residence

Laiwu Steel has done a lot of work in promoting hot-rolled H-beam and steel-structured houses. It systematically studies building and steel structure systems such as high-rise, low-rise and villas, including the first to promote energy-saving 65%, green building and other advanced technologies and products to the society. And get praise.

Yuanda Group

Adhering to the concept of energy conservation, environmental protection and life-saving, Yuanda insists on only products that can double energy conservation and can greatly improve the health level, and foster a corporate culture that is innovated in technology, and is implemented in Yuanda City and the United Nations Environmental Protection Agency. Energy-saving projects with an energy saving of 80%, innovative R&D and factory production, 9 degree seismic, 6 times material saving, 5 times energy saving, 20 times purification, 1% construction waste, 100% factory manufacturing, Known as the world architectural miracle.

China Steel Structure Association's "Twelfth Five-Year Plan" for steel structure housing construction planning recommendations

Promote the overall improvement of the construction quality of steel structure houses, and strengthen the research and development of seismic resistance, wind resistance, corrosion resistance, fire resistance, and structural safety and health monitoring of steel structures. Improve the use period and actual life of buildings more advanced, scientific and reasonable. Promote the improvement of related supporting products and components. By 2015, steel structure housing construction will account for about 15-20% of the total housing construction in the country.