The construction requirements such as node connection and earthquake resistance are not well considered, which will inevitably form a serious obstacle to the development of precast buildings.

In April 2013, the notice of the Ministry of housing and urban rural development on printing and distributing the development plan of green buildings and green ecological urban areas in the 12th Five Year Plan (Jianke [2013] No.

The competent authorities have issued a series of fiscal, tax and financial policies and technical standards to encourage the participants in the precast construction industry chain to actively carry out precast construction activities, and carry out relevant basic research on special topics, which has laid a solid foundation for the development of precast construction industry.

82), no qualification requirements will be made in the contracting process of corresponding professional projects..

The alliance has developed from the original precast component production enterprise alliance to today’s enterprise alliance integrating design, automatic production and construction.

Precast buildings were first represented by the development of Japan and the United States.

The engineering quality awards in the traditional construction industry, such as Luban Award and national high-quality engineering award, can not be applied to the quality evaluation of precast buildings.

At present, the problems existing in China’s precast concrete buildings focus on the low degree of standardization and insufficient support of quality management standards.

Development Status of precast buildings in foreign countries.

Founded in 1991, European SYSPRO construction industrialization high quality construction alliance is an innovation alliance in the field of European construction industrialization.

Most small towns in the United States are dominated by light steel structure and wood structure housing systems, while large cities are dominated by concrete precast houses and steel structure precast houses.

Combined with the lawyer’s understanding of precast buildings when acquiring precast concrete component manufacturers, this paper combs the current situation and policies of the development of precast concrete construction industry as follows, so as to provide reference for enterprises to invest in precast construction industry.

1) promotes precast concrete, steel structure and other building systems suitable for industrial production, and speeds up the development of prefabrication and assembly technology of construction projects, Improve the technology integration level of building industrialization.

At present, RPC structure (PC frame structure) is widely used in residential PC structure in Japan.

20), “For the seven professional contracting qualifications of earthwork, concrete precast components, elevator installation, metal doors and windows, prestress, nondestructive testing and sports facilities engineering cancelled in the original standard for qualification level of construction enterprises (Jian Jian [2001] No.

Combined with high-strength concrete and advanced seismic reduction and isolation technology, precast frame structure suitable for Japan’s national conditions is developed and applied to high-rise and even super high-rise buildings to adapt to the geological environment of frequent earthquakes.

In January 2015, Article 33 of the notice of the Ministry of housing and urban rural development on the implementation opinions on the qualification management regulations and qualification standards of construction enterprises (Jianshi [2015] No.

53) vigorously promoted the industrialization of housing, actively promoted the new building system suitable for industrial production, accelerated the formation of precast concrete, steel structure and other industrial building systems, completed the preparation of modular coordination standards between residential buildings and components as soon as possible, and promoted the formation of industrialization and standardization system, Realize the generalization of residential parts and accelerate the construction of an industrial base integrating design, production and construction.

In 2015, the opinions on the implementation of qualification management regulations and qualification standards for construction enterprises (Jianshi [2015] No.

The standardization, serialization and commercialization of precast building components are almost 100%.

The quality and management of precast buildings in China is still in its infancy.

Before the construction project is carried out, the precast concrete structural components are effectively selected and precast, and then the relevant building components are transported to the construction site and combined to form a complete building structure.

Development status of precast concrete buildings in China according to the report on the development of precast buildings in 2019 and main measures in 2020 issued by the Ministry of housing and urban rural development, by December 2019, 420 million m2 of newly constructed precast buildings had been started in China, an increase of 45% over 2018, accounting for about 13.4% of the newly-built building area, and the average annual growth rate in recent four years was 55%.

Solid Lifting Socket

In the process of the development of precast construction industry, the leading role of foreign governments is very obvious.

It has the advantages of fast construction speed, energy conservation and environmental protection, high strength, light self weight and so on, It can greatly reduce pollution and resource waste, and meet the needs of green manufacturing, energy conservation and environmental protection.

The integration of the in-depth design of precast components and parts with the on-site pouring is not high.

The construction, construction, supervision and design units have been used to the cast-in-situ mode, and the pre control ability of the project quality is insufficient.

There are great differences in regional development levels.

The proportion of newly started precast buildings in China’s key promotion areas (Beijing Tianjin Hebei, Yangtze River Delta and Pearl River Delta) accounts for 47.1% of the country, and the total proportion of newly started precast buildings in actively promoted areas and encouraged promotion areas (non key promotion areas) accounts for 52.9% of the country.

Relevant quality policy documents have been issued, forming a perfect precast concrete building quality control system.

Combing the policies of precast concrete construction in the three countries (I) main contents of the policy name of time institutions at the central level in January 2013, the notice of the State Council on Forwarding the action plan for green building of the Ministry of housing and urban rural development of the development and Reform Commission (GBF [2013] No.

Only through strict and continuous external and internal monitoring can it be officially granted the right to publicly use HiQ quality certification marks; Today, European SYSPRO members are all over Germany, France, Luxembourg, Belgium, Austria, Italy, the Netherlands and other countries with developed precast construction technology in Europe.

I.

The traditional building form needs to complete the components required by the construction project on the construction site.

20) has cancelled the production qualification of concrete precast components, and the component manufacturers lack the comprehensive design ability of products, especially the research on the node connection of precast components is not deep enough.

II.

From the perspective of structural form, precast concrete structure is still the main form, and shear wall structure is the main form in precast concrete residential buildings.