Gather·Change丨"carbon" road, focus on building carbon neutral

In order to achieve green and sustainable economic and social development in China and fulfill its responsibility as a major country, the Chinese government set out in its government Work report at the beginning of 2021 the goal of "achieving carbon peak by 2030 and carbon neutrality by 2060".

As the world's largest emerging economy, China's industry, transportation and construction are the "three giants" of carbon emissions, among which the construction industry is a typical pillar industry of the national economy. Since 2012, the ratio of the added value of the construction industry to the GDP has always remained above 6.85%, and reached 7.16% in 2019 and 7.2% in 2020. In 2021, it will reach 7.01%.

"Built in China" and "infrastructure fanatic" have become national name cards, and the carbon emissions of the whole construction process account for more than half of the total energy carbon emissions of the country. In 2018, the total carbon emission of the whole construction process in China was 4.93 billion tCO2, accounting for 51.2% of the total energy carbon emission in the country. The problems of high resource consumption, high pollution emission and high extensive construction are prominent, which falls far short of the requirements of the new development concept of "innovation, coordination, green, open and sharing".

The proposal of "carbon peak" and "carbon neutrality" makes the green transformation of the construction industry face great opportunities and challenges, and the prefabricated building mode is an important manifestation and realization path of green construction, which will present a stage of leapfrog development under the guidance of the two-carbon goal. Prefabricated buildings are based on the concept of green development, the transformation and upgrading of the construction industry as the goal, supported by technological innovation, and the means of information and modern organization and management, so as to realize the core of building industrialization, realize the transformation of traditional production mode to modern industrial production mode, so as to comprehensively improve the quality, efficiency and benefit of construction projects.

The processes of design, material selection, production and assembly of prefabricated buildings are interlinked and influence each other, which requires full cooperation and active cooperation among the participating units of the industrial chain.

1) In the architectural design stage, it should lead the design work of low energy consumption, ultra-low energy consumption and prefabricated buildings, combine to form "ultra-low energy consumption + prefabricated buildings", and grasp the right to speak of green design and green construction. The deep combination of prefabricated steel structure and BIM technology, along with the development of globalization and urbanization of the construction industry, as well as the requirements of sustainable development, the application of BIM technology to the comprehensive management of the whole life cycle of the building is the inevitable trend to realize the leap-forward development of the construction industry information, but also to improve the installation precision of the overall structure of the building, to achieve fine management. Optimal solutions to increase efficiency.

2) In terms of low-carbon building materials, it is necessary to accelerate research and development of new low-carbon building materials, give priority to low-carbon building materials, and develop prefabricated concrete structures, wood structures, steel structures and other new low-carbon structural systems. To improve the thermal performance of the enclosure wall structure of the prefabricated building, further improve the thermal insulation performance of the wall to reduce heat loss, the selection of external wall thermal insulation materials, and the treatment of the cold and hot bridge node of the installation fixed way, become the priority among priorities.

3) In the construction production stage, digital intelligent production and manufacturing should be vigorously promoted, which can reduce the production energy consumption and loss rate, and also greatly improve the precision, automation and turnover rate.

4) In the construction phase, the total construction scale should be controlled reasonably to avoid large-scale overconstruction and promote the improvement of stock quality. In promoting the resource utilization of construction waste, construction quality should be improved, construction life should be extended, strict technical standards and monitoring system of construction quality should be established, and strict supervision of construction decoration and demolition should be conducted.

As supporting policies of prefabricated construction continue to increase, technical standards are established and improved, social demand is greatly increased, and the whole industrial chain is steadily coordinated, the transformation foundation and favorable conditions are multi-dimensional superposition, which will help promote the acceleration of prefabricated construction industry upgrading.

Major developed countries have mature building modernization systems. The penetration rate of prefabricated buildings in the United States, Japan, France, Denmark, Sweden, Singapore and the United Kingdom has reached or exceeded 70% in 2019, while China's penetration rate in 2019 is only 13.4%. Even if the target of 30% is achieved by 2025, by contrast, There is still a large gap in the penetration rate of prefabricated buildings in China. According to the development level of the existing prefabricated building, the thermal performance of the enclosure system of the prefabricated building should be greatly improved, the wide application of the prefabricated building should be developed, and the advantages of the prefabricated building technology should be further brought into play, so as to promote the construction industry to achieve the target of carbon peak and carbon neutrality.

As a professional metal envelope system solution provider, wiskind will continue to make efforts to promote the green and low-carbon transformation of prefabricated building business and improve the economic benefits of carbon emissions through successful and comprehensive digital transformation, as well as continuous research and development in the field of industrial building envelope product system. Promote our building industry to green and low carbon sustainable development direction.