Under the call of the policy, precast buildings began to be piloted in small enterprises.

It is still necessary to use precast buildings prudently in high-rise buildings or places where strong seismic resistance is required.

Major policy indicators help the development of precast buildings.

Because of the incomparable advantages of precast buildings, China has vigorously promoted precast buildings in recent years.

At the same time, due to its weaker integrity than traditional buildings, precast buildings can not be applied to the construction field with special construction requirements for the time being.

It transfers a lot of field work in the traditional construction method to the factory, and then transports the building components and accessories built in the factory to the construction site.

2013 is the first year of the development of precast buildings in China.

In addition to these two most obvious advantages, the construction quality will also be significantly improved.

Specifically, by 2020, precast buildings will account for more than 20% of new buildings, more than 30% of municipalities directly under the Central Government, cities specifically designated in the state plan and provincial capital cities, and more than 40% of affordable housing projects will adopt precast construction.

The most fatal is the cost disadvantage.

Based on multiple advantages, precast buildings began to be used in more developed countries as early as the 1960s.

Because its finished products are spliced by precast components, it has the advantages of energy conservation, environmental protection and high efficiency of on-site construction.

The precast building also has its inherent defects.

The early precast buildings were restricted by the rigid assembly parts and looked uniform.

Fabricated precast components can reduce carbon in all aspects of the whole life cycle, such as construction, interior decoration, and later use, saving water by 20.5% per square meter, reducing carbon by 7.5%, and reducing waste emissions by 77.7%, which greatly alleviates the problem of energy consumption in traditional buildings.

In China, the core reason for the promotion of precast buildings is to reduce carbon emissions.

The first challenge is that the market supply and demand are not equal, and both construction enterprises and owner enterprises need to adapt to the market demand..

The precast components are precast in the factory, which can reduce the cracks and leakage of the wall and improve the overall safety level of the residence.

However, due to factors such as cost and people’s cognitive bias, precast buildings have appeared the situation of “crowing but not crowing”.

Later, after transformation, the appearance became more diverse, and the typical representative was the American apartment.

This has also received a positive response from the Ministry of Ecology, and the Ministry of Ecology has encouraged building emission reduction.

In recent years, China has taken precast buildings as the key construction method for promotion, and has received certain promotion results.

The precast house only needs to splice the precast house components, so it can be built quickly in complete sets, especially when it is urgent to improve the assembly efficiency and reduce the labor cost of on-site operation.

This paper will sort out the development process of precast buildings, explain the current situation and reasons of domestic development, and finally discuss the future development direction of precast buildings 1 – Precast building refers to the building made by assembling and installing building components and accessories (such as floors, wallboards, stairs, balconies, etc.) on the construction site through reliable connection.

– 2 – Opportunities and challenges of precast buildings.

Therefore, field construction is similar to “building blocks”.

According to the data of China International Commission on Environment and Development, more than one third of the total energy consumption of the whole society is building energy consumption.

The State Council led the relevant ministries and commissions to issue a number of guidance documents on precast buildings, marking the beginning of the development of precast buildings in China.

Precast components are used for assembly, thus reducing dust pollution and carbon emissions at the construction site; In addition, the splicing construction has also greatly accelerated the construction process, which has the advantages of environmental protection, energy conservation and efficiency.

Because precast buildings require precast components, the cost of prefabrication and transportation of components is increased, and the cost of installation is also increased; Precast parts need to be spliced through reserved holes, so the size of parts needs to be customized, which cannot be used universally, increasing the cost of customization; The rise of the overall cost leads to the higher price of precast houses, which directly weakens the purchase intention of consumers.

The Guiding Opinions on Vigorously Developing Precast Buildings issued in 2016 designated Beijing-Tianjin-Hebei, Yangtze River Delta, Pearl River Delta and other large cities as key development cities, aiming to accelerate the increase of the proportion of precast buildings in the new building area; At the same time, the guidance identified 30 cities as the first batch of precast building demonstration cities in China.

After the Second World War, European countries and Japan began to use precast buildings on a large scale in order to solve the housing shortage in a short time.

Swift Lift Anchors

The 2020 Central Economic Work Conference put forward eight key tasks for 2021, among which “doing a good job of carbon peak and carbon neutrality” became one of them.

These indicators give great impetus and pressure to precast buildings, and encourage local governments at all levels to promote their development.

In terms of construction management, due to less cast-in-place operations during the construction of precast buildings, the personnel input will be much less than that of traditional construction, which is conducive to on-site supervision and reduce the probability of safety accidents; At the same time, the construction reduces the disturbance to the residents.

The Crystal Palace, the theme building of the London World Expo in 1851, is the first large-scale precast building with landmark significance.

Therefore, the cost disadvantage is the biggest resistance on the market side.

⏵ 2.

According to the “Outline for the Modernization of the Construction Industry”, the market space of precast buildings is expected to reach 4.7 trillion yuan by 2025.

By 2025, precast buildings will account for more than 50% of new buildings, and the proportion of affordable housing projects will be more than 60%; Fully popularize the finished housing, the area ratio of newly started fully decorated finished housing is more than 50%, and the area ratio of fully decorated finished housing of indemnificatory housing is more than 70%.

The precast building is a new construction method vigorously promoted by the national and local governments in recent years.