Why should we develop prefabricated buildings?

why should we develop prefabricated buildings?

As early as 191, the book "Housing Industrialization" published by walter gropius elaborated in detail the standardized prefabrication, assembly and application prospect of housing units, and advocated the use of batch factory prefabricated components to produce housing economically and efficiently.

the birth and development of prefabricated buildings is the inevitable result of the industrialization and modernization of the construction industry, and it is the objective demand that the construction mode changes from the traditional production mode that relies on cheap labor costs to a mechanized and factory production mode. This is especially suitable for the stage of social development when the demand for civil buildings is strong, the labor resources are short or the cost is high, the degree of mechanization is developed, the accumulation of social wealth is rich, and the building quality and social benefits are highly valued. It is a major change in the way of building construction brought about by social and economic development. ?

1. Improve the quality of the project

The traditional cast-in-place construction method still relies on a large number of manual binding of steel bars, formwork erection and plastering, with large construction deviation, many common quality defects and obvious human factors. Assembled buildings, on the other hand, construct a large number of parts on the factory assembly line, with standardized operation, high degree of mechanization and good product quality. The installation and connection of on-site parts and components are operated by full-time industrial workers, and the building quality is significantly higher than that of cast-in-place method.

? 2. Improve production efficiency. The factory production is not affected by the bad weather and other natural environment, the construction machinery and automatic control are high, and the processing period of components is more controllable. On-site construction of the main structure, the assembled steel structure takes about the same time as the traditional steel structure, and the cast-in-place time of the assembled reinforced concrete structure is slightly longer than that of the cast-in-place method. However, the comprehensive construction period can be shortened by 25%~3% compared with the traditional cast-in-place method by combining the technologies such as interspersed construction, especially the industrialized technologies such as assembled interior decoration.

3. reduce the energy consumption in the construction process and reduce the construction pollution. Compared with the cast-in-place method, the prefabricated building can save about 25% water, reduce the dosage of plastering mortar by about 55%, save formwork wood by about 6%, and reduce construction energy consumption by about 2%. At the same time, it can reduce construction waste by more than 75%, significantly reduce construction dust and noise pollution, and reduce carbon emissions.

4. Reduce the pressure on labor resources. A large number of manual operations are reduced in an industrialized way, which reduces the labor intensity of workers, reduces the number of on-site workers by about 3%, is more convenient for construction management and technical training, and establishes a stable and high-quality assembled construction industry workforce.

unlike the United States, Japan and other major developed countries, China does not have a large number of objective conditions for developing wooden buildings, but the objective conditions for developing steel structures are mature.

in p>216, the national crude steel output reached 88 million tons, of which the steel used for steel structure construction accounted for about 7% of the crude steel output, far below the level of 3%~5% in countries such as the United States and Japan, while the residential buildings in steel structure construction accounted for less than 5%. The overall development plan of the steel structure industry in the "Thirteenth Five-Year Plan" is that the proportion of steel used in steel structure construction in China will exceed 1% in crude steel production in 22. In 219, the national crude steel output reached 996 million tons, an increase of 23% compared with 216. Driven by the simultaneous growth of steel output and steel consumption for steel structures, China's steel structure buildings will usher in a period of rapid promotion. The development of prefabricated steel residential buildings is not only one of the indicators to measure the modernization of the construction industry, but also the objective demand for China's steel industry to eliminate excess capacity and promote industrial upgrading and economic transformation. ?

the current economic situation and the development of science and technology have given prefabricated buildings a good growth soil. The application space of prefabricated buildings is becoming wider and wider, and there are more and more types of buildings, which also means that the construction industry is re-examining its position in the wave of industrialization.