The state strongly promotes precast construction, which is one of the development directions of the construction industry.

One-sided understanding of precast buildings as the only way to realize architectural industrialization.

The use of composite beams artificially adds a horizontal construction joint in the horizontal direction of the beam, which has adverse effects on the compression area of the beam and should be avoided as much as possible.

In some places, for the sake of assembly rate, it is forced to change the overall cast-in-place slab with great technical and economic advantages into reinforced concrete composite slab, while the precast composite slab is often only used as the bottom formwork.

For example, we will strive to use about 10 years from 2016 to make the proportion of precast buildings in new buildings reach 30%.

Stop the irrational and great leap forward push for precast buildings.

If the buildings with weakened seismic performance and poor integrity are left at a certain historical stage, they will become historical sinners.

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According to the statistical data in the article of Jin Hongxiang, the head of Beijing residential administration, the peak period of precast large-plate residential buildings built in Beijing from 1958 to 1991 accounted for about 10% of the total annual residential buildings completed in Beijing, and this precast type was gradually phased out by the market economy.

(Here we should look at the problem from the perspective of development, and then discuss the assembly rate after a comprehensive study of the purpose, significance and adverse factors of the implementation of precast buildings.) Some places follow the relevant policies of the state ▼ In order to achieve the assembly rate, some places clearly require the assembly rate to be reached in the controlled planning conditions of the plot, and some places do not give administrative review to the precast buildings, It can be said that the pursuit of assembly rate is chaotic.

The construction unit is the main body of the construction market, and the government has the responsibility of supervision and guidance in the market.
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In fact, whether in theory or in practice, the integrity and safety of cast-in-place concrete are better than those of precast buildings.

The essence of construction industrialization is construction mechanization, which can improve the level of mechanized production.

Cast-in-situ: I am an economical precast building precast building: I am cleaner than you are.

Practice has proved that mechanized cast-in-place concrete can also achieve construction industrialization, especially the commercial concrete technology, concrete pump truck transportation, tool type large formwork technology, pumping concrete mechanized construction technology and so on have been very mature.

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For technical and economic construction schemes with immature technology and poor economy, do not rush forward, let alone use administrative orders to “force the good into prostitution” and “hasten the growth”.

Reasonably set precast building indicators and blindly pursue assembly rate.

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It is irrational to have the suspicion of one-sided pursuit of the Great Leap Forward of Assembly.

It is the same nature as the Ministry of Agriculture to relax the control of genetically modified crops to push the precast buildings excessively and unrealistically.

Ignoring the advanced applicability of today’s mechanized cast-in-place concrete.

In the spirit of seeking truth from facts, mature technology and economically comparable technical solutions should be implemented in batches when they are mature.

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Strengthen the comparative study on the life cycle cost of precast buildings and mechanized cast-in-place concrete buildings, strengthen the comparative study on market sales, strengthen the comparative study on customer demand, and strengthen the comparative study on the decoration, use, maintenance and other aspects of finished building products.

The tool-type large formwork that can be used repeatedly is changed into a one-time precast composite slab bottom formwork, which increases the process, wastes materials and increases the dead weight of the structure.

Suggestions: 1.

The waste of social resources itself is not the embodiment of the green concept and environmental protection concept.

▲ Click the Civil Engineering Bar to focus on our authoritative civil engineering expert team to build a civil engineering bar.

Cast-in-situ: I am safer than you are.

This is a great opportunity for the Ministry of Housing and Urban-Rural Development to study the damage mechanism of precast buildings and cast-in-place concrete buildings under earthquake loads.

A comparative study is made on the seismic performance and fire resistance of precast stairs and cast-in-place stairs, which are very important for earthquake escape and fire evacuation.

Cast-in-situ: I am cleaner than you are.

Flat Steel Anchor

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It is an indisputable fact that the cost of precast precast buildings is more than 10% higher than that of mechanized cast-in-place concrete buildings.

Cast-in-situ: I am faster than you are.

Be responsible for the history, stop and one-sided publicize the advantages of precast buildings as soon as possible, and rationally and dialectically view the advantages and disadvantages of precast buildings and mechanized cast-in-place concrete buildings.

Under the existing historical conditions, there are still some problems that are worth thinking about: 1.

The author of the provincial and municipal communication group: Sheng Aihua, master of engineering, senior engineer, national registered cost engineer, first-class constructor, and supervision engineer.

Assembled building: I am cleaner than you are.

It is responsible for the history and should not be the sinner of the history.

In the spirit of seeking truth from facts, we should guide the market to develop in a healthy direction from the perspective of comprehensive social benefits, and we should not unduly promote precast precast buildings with the isolated slogans of green and environmental protection.

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The earthquake occurred in Jiuzhaigou, Sichuan, on Tuesday night and Xinjiang on Wednesday morning.

In the spirit of being responsible for history, we should strengthen the comparative study of seismic performance between precast buildings and mechanized cast-in-place concrete buildings.

Written on August 19, 2017, editor’s note: I just wrote an article on Sunday calling for strengthening the seismic research of precast buildings.

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Any appearance of the objective laws of nature will be punished by nature.

Mechanized cast-in-place concrete buildings have a better performance-price ratio than precast concrete buildings.

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The increase in cost is a direct reflection of resource consumption, which is in contradiction with the so-called energy saving, material saving and environmental protection of precast precast buildings.

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