The construction industry accelerates its transformation to green intelligence

Looking back at the upcoming 2022, the construction industry has been tested in various aspects such as the epidemic. With the changes in the market environment, the transformation of the construction industry is imminent, and the construction industry takes scientific and technological innovation as the lead to promote the transformation and upgrading of the industry to industrialization, green and intelligent.

Prefabricated buildings promote productivity

    In recent years, China has vigorously developed new building industrialization represented by prefabricated buildings, and promoted the optimization and upgrading of "Built in China". The rise of a number of independent innovation software, the level of equipment continues to improve, a series of world-class construction projects have become a striking symbol of "built in China", the construction industry from the site mixing mortar, "dust" of the traditional workshop era, the development of "building houses like cars" era of construction industrialization, is moving towards the era of digital construction.

    Construction industrialization makes the construction from the site to the factory, from construction to manufacturing transformation. The person in charge of China Construction Technology Group told reporters that they vigorously develop the industrialization of construction, a few years ago began the national layout of the manufacturing base, and currently has 24 new building industrial manufacturing bases and domestic leading intelligent production lines.

    Taking the Shenshan prefabricated building Smart Factory of China Construction Technology as an example, the factory is equipped with 17 production lines, with double leather wall panels, prestressed components, prestressed composite panels, prestressed double T panels, wall panels, fixed formwork, steel bars, concrete and other automatic production lines, which can produce beams, panels, columns, stairs, balconies and various prestressed components, with a designed production capacity of 220,000 cubic meters/year. It can meet the demand of 2 million cubic meters/year of prefabricated buildings.

The intelligent robot for binding steel bars has been applied in the smart factory of Shenzhen and Shantou prefabricated buildings. The intelligent robot can automatically identify and locate the bar mesh cage nodes, and realize the automatic processing of the bar mesh cage for the bay window through the hardware and software of the industrial six-axis robot arm, fixture, rotary table, integrated control system, etc. The production efficiency has been increased by 4 times, and the yield has been increased to more than 95%. To achieve efficient production, safe production, high quality production.

    Prefabricated construction has promoted the energy conservation and emission reduction of the construction industry and significantly improved the production efficiency. Taking Beijing Yizhuang blue-collar apartment project as an example, the project is 32 meters high, the construction area is 120,000 square meters, and the overall assembly rate is 92%. Since 90% of the building has been completed in the factory, the construction site can be moisture-free operation, can save 70% water, and achieve zero sewage discharge; No welding and other processes, can save 70% of electricity; No scaffolding, can reduce 80% of construction waste; The building materials can be disassembled and recycled, and the recycling rate can reach 90%. Six workers on site with a tower crane can complete the lifting of four box-type houses per hour. If four tower cranes work at the same time, 88 box-type houses can be completed in one day, the lifting accuracy can be controlled within 5 mm, and the construction speed is 60% faster than the traditional construction speed.

    A few days ago, the Ministry of Housing and Urban-Rural Development issued the "prefabricated building development can be copied and promoted experience List" (the first batch), prefabricated buildings will seek new breakthroughs from policy guidance, technical support, industrial development, capacity improvement, supervision and management, innovative development and other aspects.

    At present, more than 20 provinces in the country have introduced support policies and subsidy system standards related to prefabricated buildings, which will help the vigorous development of prefabricated buildings. Industry insiders expect that in the future, 80 to 90 percent of the Xiongan New Area will be prefabricated buildings. In Beijing, prefabricated buildings with only affordable housing have reached a high proportion. Prefabricated buildings will become the main construction method of the construction industry in the future, and will also usher in new growth opportunities for the industry.

Accelerate clean and low-carbon transformation

    Relevant data showed that the whole process of building energy consumption accounted for 45% of the total national energy consumption, and carbon emissions accounted for 50.6% of the total national emissions. The report of the 20th National Congress of the CPC proposed to promote the clean, low-carbon and efficient use of energy, and promote the clean and low-carbon transformation of industry, construction, transportation and other fields. In 2022, the development of green buildings in China will advance steadily.

    Accelerating the development of green buildings is an important starting point for the clean and low-carbon transformation of the construction sector. As of the first half of 2022, the proportion of new green buildings in China has exceeded 90%. According to the 14th Five-Year Plan for Building Energy Conservation and Green Building Development, by 2025, all new buildings in cities and towns will be completed as green buildings, building energy utilization efficiency will be steadily improved, building energy use structure will be gradually optimized, building energy consumption and carbon emissions will be effectively controlled, and a green, low-carbon and circular construction and development mode will be basically formed. Lay a solid foundation for peaking carbon in urban and rural construction before 2030.

    In September 2022, the Ministry of Housing and Urban-Rural Development publicized the first batch of three-star green building identification projects in 2022. According to the new version of the "Green Building evaluation Standards", China's green building evaluation index system is composed of five categories of indicators: safety and durability, health and comfort, convenience of life, resource conservation, and environmental livable, each category of indicators includes control items and scoring items, and a unified set of bonus points. When all the control requirements in the green building evaluation criteria are met, the green building grade shall be basic. When the total score reaches 60 points, 70 points, 85 points and meets the technical requirements of the corresponding star-rated green building, the green building grade is one star, two star, three star.

    From the announcement of the first batch of three-star green building identification projects in 2022, it can be seen that for civil buildings, obtaining the star-rated green building identification must investigate some key technical indicators, including the carbon emission intensity of the building operation stage, the thermal performance of the envelope structure, the reduction proportion of the heat transfer coefficient of the external Windows of residential buildings in cold and cold areas, and the water efficiency level of water-saving appliances. Building sound insulation performance, indoor main air pollutant concentration, exterior window airtight, watertight, wind pressure resistance performance, fully decorated green land rate, annual runoff total control rate, renewable energy utilization rate, non-traditional water utilization rate, green building materials application ratio.

    The development of green buildings is inseparable from innovative technological means. At present, the use of advanced technology to make the energy generated by the building exceeds the energy required for its own operation, and the construction of productive buildings is also an important direction to promote green buildings and building energy conservation. "Light storage straight soft" building is a productive building. The State Council's "Carbon peak Action Plan before 2030" proposes to build a "light storage direct and soft" building integrating photovoltaic power generation, energy storage, DC distribution, and flexible electricity consumption.

    The office building of Zhongjian Green Industrial Park, located in Shenzhen-Shantou Special Cooperation Zone in Shenzhen, is a "light storage direct soft" building. This "light storage direct and soft" building, the roof of the solar photovoltaic power generation device to store electricity and achieve flexible use, operation for more than a year, saving electricity more than 100,000 KWH, saving about 33.34 tons of standard coal, reducing carbon emissions of more than 47%, equivalent to planting 160,000 square meters. It realizes the transformation of the building from energy consumer to producer, storage and regulator, and makes the building become a "green power plant". Many people in the industry believe that "light storage straight and soft" buildings will be a mainstream direction for the development of green buildings and building energy conservation in the future.

Intelligent construction helps high-quality development

    At present, intelligent construction has become an inevitable trend of the development of the construction industry and an important starting point for transformation and upgrading, and is the only way for the transformation and upgrading of the construction industry. In 2022, smart construction will accelerate. In November 2022, the Ministry of Housing and Urban-Rural Development listed 24 cities, including Beijing, Tianjin, Chongqing and Xiongan New Area in Hebei Province, as smart construction pilot cities for a period of three years.

Intelligent construction is through the cross integration of computer technology, network technology, mechanical and electronic technology, construction technology and management science, to promote the construction and construction process to achieve digital design, robot-led or assisted construction engineering construction mode, is to speed up the transformation and upgrading of the construction industry, to achieve the modernization of the construction industry.

     Ding Lieyun, academician of the Chinese Academy of Engineering, believes that intelligent construction is a new construction model formed by the integration of information technology and engineering construction. On the basis of digitization of engineering element resources, it is fully empowered through standardized modeling, networked interaction, visual cognition, high performance computing and intelligent decision making. Intelligent construction to achieve digital chain driven project planning, planning and design, construction production, operation and maintenance services integration and efficient collaboration, the delivery of people-oriented, intelligent green sustainable engineering products and services. Intelligent construction promotes the interconnection, integration of online and offline, coordination of resources and factors in the construction process, and is an important support for achieving high-quality development of the construction industry.

    Construction is underway at the Tongzhou Hospital site of Beijing Anzhen Hospital in Songzhuang Town, Tongzhou District, Beijing. In the view of Xiong Zhengchao, chief engineer of Tongzhou Hospital project of Beijing Anzhen Hospital of Beijing Urban Construction Group, medical engineering has strong professionalism, high requirements, large structural volume, difficult organization and material management, more mechanical and electrical majors, and difficult pipeline layout. Relying on high-standard digital construction, it ensures high-quality construction by promoting intelligent construction.

Xiong Zhengchao introduced that by building a virtual construction information model, the project can simulate most of the construction processes at the start of the project, or optimize many unforeseen practices through digital modeling, and the construction personnel can really intervene before the start of each process, abandoning the traditional "see the move" and "feel the stones across the river" form to solve the problem. Through digital empowerment and analog construction, it can achieve twice the result with half the effort. At the same time, the digital management platform is introduced to upload all kinds of information in the construction process to the management platform in a timely manner, so that project decision-makers can understand the project dynamics without leaving home, and can quickly find problems, make decisions, and allocate resources.

    Xiong Zhengchao said that through the use of 5G, big data, AI artificial intelligence, AR augmented reality and other advanced technologies, they have built a "5G smart site" comprehensive management platform, so that mobile Internet, Internet of things, big data and the deep integration of the construction site, not only improve the efficiency of project management, ensure the smooth implementation of the project, but also reduce the cost of construction site management. Actively realize green construction, ecological construction and intelligent construction.

     According to the relevant person in charge of the Ministry of Housing and Urban-Rural Development, 24 cities are listed as smart construction pilot cities, and the main direction is to promote the deep integration of the construction industry and the digital economy with the support of scientific and technological innovation, cultivate new industries and new formats of smart construction, and strive to solve the outstanding problems of extensive production methods, labor shortages, and large resource and energy consumption in project construction. We will make better use of the important fulcrum role of the construction industry in ensuring steady growth and expanding domestic demand.

The development of intelligent construction is of great significance and great potential. By promoting the coordinated development of intelligent construction and construction industrialization, the core competitiveness of "China Construction" will continue to improve, and the high-quality development achievements of the construction industry will be more bright.

Source: Economic Daily