In 2011, China's steel output reached a record high of 627 million tons. Today, with the unprecedented pressure on energy conservation and emission reduction, and advocating a low-carbon economy and sustainable development, steel-structured houses have received extensive attention from all walks of life. During the two sessions this year, many representatives made suggestions on promoting the development of steel structure housing.

 

What are the values ​​of steel-framed houses? We may wish to calculate the steel structure.

 

Achieve low carbon construction and sustainable development of residential buildings

 

The steel structure residential building is a green building in the 21st century. It is an effective way to reduce carbon emissions and promote sustainable development of the cycle.

 

Low-carbon construction: CO2 emissions from construction of steel-structured houses are about 480kg/m2, which is more than 35% lower than traditional concrete carbon emissions of 740.6 kg/m2;

 

Material: The high-rise building of steel structure residential building has a weight of about 900-1000kg/m2, the traditional concrete is about 1500-1800 kg/m2, and its self-weight is reduced by about 40%.

 

● It can greatly reduce the consumption of resources such as cement and sand, thus greatly reducing carbon emissions during mineral excavation, smelting and transportation;

 

● There is no need for wood formwork and scaffolding during the construction of steel structure houses. If the market share increases by 5 percentage points, it can reduce the deforestation equivalent to 9000 hectares of forest;

 

● The building's own weight is reduced, and about 30% of the underground pile foundation is saved;

 

Water saving (reducing sewage discharge): Steel structure houses are mainly on-site assembly and construction, and water and sewage discharge can be greatly reduced during the construction process. If its market share increases by 5 percentage points, it will reduce the sewage discharge equivalent to the total water volume of 10 West Lakes;

 

Energy saving (saving energy consumption): CCA lightweight grouting wall has good self-insulation function, which is 3 times of traditional brick wall insulation performance, which greatly reduces operating energy consumption.

 

Provincial land (improving land use efficiency): The steel structure is “high and light”, easy to implement high-rise buildings, and can improve the efficiency of land per unit area; the indoor rate can increase by 5%-8%, and the underground garage parking space can be Increased by 10%-20%, today's social and economic value is particularly prominent in the case of the difficulty of parking and the difficulty of parking;

 

Environmental protection: Assembling construction, reducing noise, disturbing people, wastewater discharge and dust pollution at the construction site; reducing sandstone mining and construction waste discharge, protecting the environment, and building a new era of architectural civilization;

 

Recycling and Recycling of Main Materials: When the building is demolished, the recovery rate of the main structural materials of the steel structure residential buildings is over 90%, which is about 60% lower than that of traditional concrete waste.

 

● Respond effectively to the national “implementation of circular production methods”, and steel recycling and recycling can be a strategic resource reserve for the country;

 

● Reducing the landfill resource occupation and the harmful substances in the garbage to the surface and groundwater sources (construction waste accounts for about 40% of the total social waste);

 

Turn waste into treasure, use industrial waste resources: In the composite wall, industrial waste is the main material, turning waste into treasure - CCA wallboard is made of quartz sand tailings; fly ash is used in light grouting filling materials. Industrial waste is the main material, and it responds to the national call for “promoting the utilization of industrial waste resources”.

 

Promote the transformation and upgrading of China's housing industry

 

The steel structure residence fully conforms to the modernization development concept of the housing industry of “standardized design, factory production, assembly construction and integrated decoration”. It is the era of hand-built masonry in China, promoting the transformation of the production mode of residential buildings and promoting the transformation and upgrading of residential buildings. And an effective way of sustainable development.

 

Standardization of architectural design:

 

● The steel structure has perfect technical regulations, complete design software, and the steel structure components are accurate in size, so it is easy to realize “coordination of the modulus and size of the building and parts”, thereby improving the design and construction efficiency.

 

● Steel structural members have strong versatility and interchangeability, and are suitable for assembly construction and industrial construction.

 

Construction of parts (parts):

 

●Because most parts and components of steel structure houses are standardized and accurately prefabricated in the factory, the processing precision and quality are unmatched by traditional field operations;

 

● On-site construction workers will be transformed into assembly workers, reducing the labor intensity of workers and ensuring more quality.

 

On-site construction assembly:

 

● All the components of the steel structure house are prefabricated in the factory. The construction site connects, assembles and assembles the components through bolts, welding and other reliable means, and builds the house like a car.

 

●All kinds of processes can be three-dimensionally intersected to improve construction efficiency and shorten the construction period by more than 1/3;

 

● A large number of dry operations replace wet operation, the amount of on-site construction is greatly reduced, pollution discharge is also significantly reduced, the general material rate is more than 20%, and the water saving rate is more than 60%;

 

● Less concealed works, easy quality control and supervision, can effectively avoid the problem of traditional construction cut corners, or the construction workers are not strong enough to cause quality and safety risks;

 

●Assembled construction method, the construction site is occupied less;

 

● Significantly reduce the amount of on-site operations, reduce the number of on-site construction and management personnel, and effectively solve the problem of “labor shortage”;

 

● Relevant supporting advanced building energy-saving technologies are more convenient to apply.

 

Integration of civil works and decoration:

 

The surface of the CCA board wall is very flat and does not need to be plastered;

 

The wall adopts light steel keel frame structure system, which is convenient for pipeline pre-buried, easy to realize integrated construction and decoration solutions, and reduce waste of resources and materials;

 

Integrated embedded integrated decoration technology to improve the quality of residential decoration.

 

Improve the quality and comfort of the house

 

Improve quality problems such as leakage and cracking of traditional residential walls;

 

The sound insulation performance of the wall is effectively improved;

 

The CIA board has a self-insulation function, and the overall grouting composite wall body avoids the disadvantages of poor external fire insulation performance or external wall insulation system (such as: CCTV, Shanghai and Shenyang fire);

 

CCA board grouting wall with no condensation and breathing function, providing a dry and comfortable living space;

 

Door and window openings are not restricted, improving the lighting and ventilation performance of the house and enhancing the comfort of the house;

 

There is no load-bearing wall inside, the layout of the large opening, the space is easy to separate and realize the functional transformation, improve the adaptability of the house to the changes of the family structure, and prolong the service life of the residential building.

 

Improve the earthquake resistance and disaster prevention capacity of buildings and build a safe home

 

Since 1900, the number of deaths caused by earthquake disasters in China has reached 550,000, accounting for 53% of the global earthquake deaths. The reason is that for a long time, China's residential buildings are mainly brick-and-mortar structures or brick-concrete structures, and the buildings have insufficient seismic performance. The majority of earthquake deaths are caused by sudden death or suffocation. Second, the collapsed buildings hindered the road and seriously hindered the rescue after the earthquake.

 

As one of the most earthquake-stricken countries in the world, after suffering the Great Kanto Earthquake of 1923, the Japanese government made a determination to improve the seismic capacity of buildings. In the following year, the world’s first building seismic code was issued, and each building was built. The seismic performance of the building was accurately calculated. In particular, after the 1995 Kobe earthquake, 83.3% of the deaths were caused by the collapse of houses, and 12.8% were caused by fire. Subsequently, the epicenter of Hyogo Prefecture implemented the “No Birds” program, requiring buildings to suffer an earthquake of magnitude 8; the Japanese government proposed a “zero death” plan; the Central Disaster Prevention Conference established the “Earthquake Relief of Buildings” in 2005. According to the Policy, the earthquake resistance rate of buildings and their components will reach 90% by 2015. Therefore, various state-of-the-art anti-vibration methods such as steel structures and lightweight materials with excellent seismic performance are widely used, and almost all old-fashioned buildings are reinforced with steel frames of different shapes such as X, K, and Y.

 

This year's 3.11 devastating earthquake, Japan reached the highest level of 9 in the history of human observation, and the turn of the tsunami that triggered the millennium. Facts have proved that Japan has indeed withstood the test of the magnitude 9 earthquake, and the earthquake itself has not caused much damage to the building.

 

The outstanding seismic performance of steel-framed houses was once again confirmed.