I guess at that time, the Ministry of Housing and Urban-Rural Development must feel dizzy, and the Standards and Quota Department had to immediately “the letter on the revision of the Evaluation Standard for Industrial Buildings” JB 2016 [164], and organize the new bid work, People and units kept some and changed some.

For the current development of precast buildings, industry experts have long expressed their concerns.

Let’s review the “13th Five-Year Plan” for precast buildings issued by the Ministry of Housing and Urban-Rural Development on March 23, 2017, This action plan is formulated to promote the comprehensive development of precast buildings.

Here are several key words: positive and stable, steel structure, mature and applicable, safe and reliable, and wood structure.

It is a bad time for life.

During the Chief Engineer’s Forum held by the Steel Structure Design Branch of the China Association of Steel Structures on August 18, 2018, experts held a closed meeting.

The evaluation plan has been drafted.

How to align? How to ensure the grouting quality? In Japan, precast shear wall structures are not used.

▲ Click the civil engineering bar to pay attention to our authoritative civil engineering expert team to build the WeChat Tumunao, and join the provincial and municipal communication group? Or not? This is a problem.

In view of the current sharp rise in the price of building materials such as gravel concrete and the treatment of sea sand chaos, relevant units have been entrusted to carry out a feasibility study on promoting the modernization of the construction industry by promoting precast steel structures.

Encourage local governments to set higher development goals, Realize the comprehensive development of precast buildings.

They use precast concrete frames and frame tubes, which are made of thick steel bars, and the construction quality is easy to ensure.

The outstanding problem of the current precast building is also the poor integrity and continuity.

It seems that the precast construction movement will stop.

Of course, the reasons given by the Ministry are somewhat grudging: the price of sand and gravel concrete has risen sharply, and the sea sand chaos has been controlled.

This is nothing.

The following is a summary of the civil engineers’ arrangement: Beijing began to develop hollow slabs in 1958.

It may also set a record.

Assembled building is a hot topic in recent years.

The Evaluation Standard for Assembled Buildings was issued in December 2017 and implemented on February 1, 2018.

Can the current design method and construction quality withstand the test of earthquake? How many experiments can really verify this? For example, the precast concrete shear wall has very thin reinforcement and small diameter of connecting sleeve.

Due to poor integrity and continuity, a large number of casualties were caused in the 1976 Tangshan earthquake.

Study the basic theory, technical system and construction technology of multi-story and high-rise precast concrete buildings with high assembly rate, and study the application of high-performance concrete, high-strength reinforcement, energy dissipation and vibration reduction, and prestressed technology in precast buildings ……

A national symposium on precast buildings was held to listen to the development of precast buildings in some regions, exchange work experience and deploy the next step.

To console myself, the standard number has not changed.

The first batch of precast building demonstration cities and industrial bases have been investigated and evaluated.

Use various resources and channels to support the development of precast buildings, especially actively coordinate the land department to use precast buildings as construction conditions when transferring or allocating land Local governments can take the level of assembly rate as the basis for supporting and encouraging policies.

The main reason is that the original grand blueprint, especially some rigid indicators, is too big to move forward, and it tugs at the crotch.

Through the evaluation, the current development status of precast buildings has been studied, and the existing problems and deficiencies have been analyzed.

When the country put forward various goals for the development of precast buildings, there is no unified view of what precast buildings are! In 2015, the Ministry of Housing and Urban-Rural Development just worked out the Evaluation Standard for Industrial Buildings (GB/T51129-2015), which has been implemented since January 1, 2016.

……

Launch the preparation of precast building technology system guide, sort out and propose mature, applicable, safe and reliable precast building technology system suitable for China’s national conditions, and increase the promotion and application.

From February to May this year, the 11th Central Inspection Team conducted an inspection tour of the Party Leadership Group of the Ministry of Housing and Urban-Rural Development, There is a special section on precast buildings in the “Notice of the Party Group of the Ministry of Housing and Urban-Rural Development of the Communist Party of China on the Progress of Inspection and Rectification” issued on October 28, 2018.

The competent departments of housing and urban and rural construction of each province (district, city) should include the development of precast buildings in the key assessment and supervision items as an important assessment indicator in the field of housing and urban and rural construction.

Here is an interesting detail.

It was only in September that the state proposed “precast buildings” instead of “industrial buildings”.

Alas, the “Evaluation Standard for Industrial Buildings” was revised within one year of implementation and abolished within two years.

Entrust relevant units to carry out research on wood structure building technology suitable for China’s national conditions, put forward development countermeasures for wood structure building in China, and promote the healthy development of wood structure building in China.

By 2020, the proportion of precast buildings in new buildings in China will reach more than 15%, including more than 20% in key promotion areas, more than 15% in active promotion areas, and more than 10% in encouraged promotion areas.

Compared with the “bulletin” on October 28 and the “action plan” on March 23, it is obvious that the “bulletin” is more grounded.

(3) Actively and steadily promote the development of precast buildings.

In addition to safety issues, the durability of precast buildings is also very worrying.
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