Vigorously promote steel structure residential buildings

Experts such as Liu Yi, Vice President of China Metallurgical Construction Research Institute and Executive Vice President of China Steel Structure Association, unanimously believe that the technology of steel structure residential buildings in our country is becoming increasingly mature, and large-scale promotion is imperative.

The "Hangxiao Steel Structure" steel structure residential professional system has laid the foundation for the universalization of China's steel structure residential system, and there is more hope for the development of China's residential industrialization, "said Wen Linfeng, Deputy Director of the Housing Industrialization Promotion Center of the Ministry of Housing and Urban Rural Development.

Recently, another demonstration project of steel structure residential buildings in China, Hangxiao Steel Structure Baotou "Wanjun Daducheng" Phase I project, was launched. The "Hangxiao Steel Structure High rise Steel Structure Residential Industrialization Technology System On site Exchange Meeting" was jointly organized by the Housing Industrialization Promotion Center of the Ministry of Housing and Urban Rural Development, China Construction Metal Steel Structure Association, Inner Mongolia Autonomous Region Construction Commission, Baotou Municipal Government and other institutions. Industry experts gave high praise, and the steel structure enterprises were excited.

Policy Sunshine Shines on Steel Structure Residential Buildings

For Hangxiao Steel Structure, which has plunged into the field of steel structure residential buildings, invested over a billion yuan, and honed its sword in ten years, the biggest joy this year is that the steel structure industry can finally bask in the sunshine of national policies.

On April 27th, the Ministry of Finance and the Ministry of Housing and Urban Rural Development jointly issued a notice on the implementation of the "Opinions on Accelerating the Development of Green Buildings in China", which clearly stated that by establishing fiscal incentive mechanisms, improving standard specifications and evaluation identification systems, promoting relevant scientific and technological progress and industrial development, and other means, the proportion of green buildings in new construction will strive to exceed 30% by 2022.

As the main representative of green buildings, steel structure residential buildings can achieve "light and efficient", which means they have excellent properties such as light weight, fast construction speed, good performance, energy saving, material saving, water saving, land saving, earthquake resistance, etc. They are one of the building structures with the least impact on urban environment. Data shows that China's annual construction waste reaches 400 million tons, accounting for 40% of the total urban waste. Taking the path of energy conservation and emission reduction, construction is an important breakthrough point, and promoting steel structure housing is of great significance.

However, for a long time, due to insufficient understanding of the characteristics of steel structures in society, lack of corresponding policy support from the government, incomplete technical system, inability to form a large-scale construction volume, and high cost, the development of steel structure residential buildings has been slow.

Breaking away from traditional construction methods and promoting revolutionary changes in the construction industry, we have gone through countless difficulties and twists. Steel structure residential buildings have come this far, and we will cherish them even more and work harder. "This is the common aspiration of enterprises such as Hangxiao Steel Structure, Baosteel Construction, and Laigang.

The technical system is becoming increasingly perfect

Building houses like building blocks! On average, every two and a half to three days, one floor is built. In less than two years, the 275000 square meter phase has entered the final stage of mechanical and electrical equipment installation, commissioning, and interior decoration. In 2010, Hangxiao Steel Structure began constructing a 32 story Wanjun Metropolitan City complex in Baotou City, with a height of 96.6 meters and a seismic fortification intensity of 8 degrees. Its fast construction speed and unique construction method have attracted social attention. This is another steel structure residential masterpiece by Hangxiao Steel Structure, following projects such as Hangxiao Collective Apartment, Wuhan Century Home, and Angola Anju Project.

Unlike traditional concrete structures, the steel structure residential structure system adopts a steel frame steel-concrete core tube system. This system has high lateral stiffness and strong adaptability to building layout, making it easy to meet the functional requirements of residential layout, fire prevention, and sound insulation. The steel support adopts a combination of central support and eccentric support to form a lateral force resistant support system. Eccentric support consists of supporting diagonal bars and energy dissipation beam segments. Due to the installation of energy dissipation beam segments, the energy dissipation beam segments first shear and yield under large earthquakes, forming an energy dissipation mechanism to avoid buckling of the supporting diagonal bars and improve the seismic resistance of the building. The steel components were pre made in the factory, greatly improving the on-site construction speed.

Unlike the traditional construction method of cast-in-place concrete floor slabs, Hangxiao Steel Structure's steel truss floor slab is a combination template that processes the steel bars in the floor slab into steel trusses in the factory, welds the steel trusses with galvanized profiled steel plates, and pours concrete on top of them. The use of steel truss floor support plates can significantly reduce the amount of on-site formwork and scaffolding, simplify steel reinforcement kidnapping, reduce on-site waste, and ensure fast and high-quality installation.

Unlike traditional walls, the Handbang CCA board integral grouting wall, which is made of materials such as fibers, cement, quartz sand, additives, and water, is a composite solid wall formed by using Handbang CCA board as the panel, light steel keel as the column, and pumping concrete into its cavity. It does not contain asbestos or other harmful substances and is a new environmentally friendly material with excellent properties such as fire prevention and waterproofing. The overall grouting wall of CCA board is flat and does not require plastering, saving materials and manpower.

The Hangxiao Steel Structure R&D team has conducted comprehensive exploration on the structural system, construction selection, wall materials, production organization, and construction management to address the shortcomings of existing steel structure residential buildings in China, including factory work, indoor work, high-altitude work on the ground, dangerous and complex work done by machines, and environmental pollution work. They have found a complete set of methods to improve the performance of steel structure residential buildings.

The alliance between steel and housing is the way out

This year, the steel industry has been in great distress, from raising pigs at Wuhan Iron and Steel to making profits of less than a plate of vegetables per ton of steel, the steel industry is in a difficult situation and urgently needs to find a way out.

China has 36 million sets of affordable housing, and if a portion of it is used to build steel structure residential buildings, calculated at 30-50 kilograms of steel per square meter, it is an astronomical figure. If it can be promoted in commercial housing, it will be an incredibly huge market. The Housing and Steel Alliance is the right path for China's steel industry to overcome difficulties, and it is also the right choice for the country and the people! "Yao Bing, the president of the China Construction Metal Association, has been tirelessly calling for it.

The amount of steel used in construction in developed countries accounts for 10% -30% of steel production. Based on China's annual production of 880 million tons of steel in 2011, the annual amount of steel used in construction in China is only over 20 million tons, which is a negligible proportion. It is hoped that the government will provide appropriate subsidies for pilot projects of steel structure residential buildings to encourage their rapid development. "Steel structure expert Chen Luru suggested.

Steel is the lifeblood of industry, and steel structure is a strategic resource for the country. Although China currently has a severe surplus of steel, it is still in short supply in the long run because China's high-quality iron ore resources are relatively scarce. Iron ore mainly relies on imports, and the annual cost of importing iron ore is astronomical. From the perspective of future national savings and development, and from the perspective of "national strategic reserves", purposefully storing steel, storing steel for construction, storing steel for the people, and steel structure residential buildings should be the best way! "Many steel structure enterprises have called for it.