Parts are made and installed in place in one step in the factory, and they are installed quickly on site.

First, reinforced concrete precast buildings represented by Vanke and others.

Second, the water consumption is too large.

Fourth, there are common quality problems, serious cracking and leakage.

Now the annual completed housing area has reached 2.5 billion square meters, and the annual water consumption is more than 30 billion tons.

Objectively speaking, although it has made great contributions to the rapid development of urban and rural construction, its disadvantages are also very prominent: first, extensive operation mode, steel Cement waste is serious.

Among them, about 1/7 according to the number of projects, about 1/5 according to the building area, and about 1/4 according to the amount of investment are high-rise and super high-rise office, hotel, apartment buildings, which can adopt this building form.

The water consumption of the cast-in-place system is more than 12 tons / square meter.

This building model is suitable for multi-storey, small high-rise office and residential buildings.

Third, all steel precast buildings represented by Yuanda industrialized sustainable buildings.

The rate of parts is 80%~90%.

“The technical path adopted by sustainable buildings is the integration and integration of steel structures, which realizes the transportation of similar standard containerized containers, greatly reduces the cost of shipping, and solves the bottleneck of the transportation radius of general precast buildings.

More than 2000 kilometers of urban underground comprehensive pipe gallery have been started.

In 2014, China completed 2.573 billion square meters of housing (1.075 billion square meters of real estate), 415500 new projects, and the output value of the construction industry was 17.67 trillion yuan.

Enhance the scientificity, authority and openness of urban planning, and promote the “integration of multiple regulations”.

It completely replaces traditional technology, saving energy (80%), steel (10%~30%), concrete (60%~70%), and water (90%).

When talking about how to promote the wide application of the cast building form of all steel structure in multi-storey and small high-rise buildings (houses with less than 30 floors and a large number of areas), Wang Tiehong believes that the core problem is to solve the problem of whether it is good, economical or not, and whether it is fast or not.

Third, the construction site is dirty, messy and poor, which is often an important pollution source of inhalable particles above PM10 in the city.

“The sustainable buildings that can be built by Yuanda are ‘six saving and one environmental protection’ (that is, more energy-saving, land-saving, water-saving, material saving, time saving, investment saving and environmental protection) buildings, which conform to the concept of circular economy, are good, economical and fast, and realize the transformation from extensive construction industry to high-end manufacturing industry, which is a profound change in the transformation and development of the construction industry.” Since 2013, Wang Tiehong, who led a special research group to conduct in-depth tracking research on Yuanda Kejian for five times, spoke highly of this.

This building mode is suitable for high-rise and super high-rise office and hotel buildings, and some of it is applied to residential buildings.

High standardization and integration reduce the cost by 1/4~1/3 compared with traditional technology, and one to two floors can be built every day.

On the basis of traditional technology core tube, it focuses on the industrialization of steel structure components as far as possible, and also extends to the integration of on-site decoration.

Fifth, labor costs soared, and it was difficult to recruit, manage, and control quality.

Source: in the two sessions of China building materials news, Li Keqiang said: we should strengthen the management of urban planning and construction.

This building mode is suitable for high-rise and super high-rise office, hotel and apartment buildings.

Actively promote green buildings and building materials, vigorously develop steel structures and precast buildings, and improve the standards and quality of construction projects.

The second is steel structure precast buildings represented by southeast grid, China Construction steel structure, Hangxiao steel structure, etc.

We believe it will become a starting point of the ‘the Belt and Road’ strategy.” Wang Tiehong emphasized in particular.

The component conversion rate is 30% – 40%, emphasizing the integration rate.

According to Wang Tiehong, after nearly 10 years of hard work, China’s factory assembled buildings have made breakthrough progress and are in the leading position in the world.

This shows that traditional technology has not changed.

Based on the traditional technical framework and frame shear wall, it focuses on the component of exterior wall panels, interior wall panels, floors, etc., with a component rate of 40%~50%, and extends to the integration of on-site decoration.

Loop Box

At present, high-rise and super high-rise buildings are mainly steel structures, but not all steel structures.

Build a smart city, improve the living environment, and make the people’s lives more secure, less worry, and more comfortable.

To sum up, there are three modes.

They are mostly reinforced concrete core tube + steel frame structures, which still do not completely get rid of many disadvantages of traditional technology.

Developing factory assembled buildings is the demand of energy conservation and environmental protection.

The cost is further reduced, which is close to the cost of traditional technology, and it can build a floor in about 5 days.

The development prospect of factory assembled buildings is expected.

When talking about the promotion prospect of all steel structure precast buildings, Wang Tiehong made a detailed explanation with the building data of 2014 as an example.

In addition to the requirements of energy conservation and emission reduction, we must speed up the transformation and vigorously develop and promote factory assembled buildings.

It is reported that Yuanda Kejian once completed the 57 storey “Xiaotian city” in Changsha in 19 days, creating a new record for high-rise buildings with an average construction rate of 3 floors per day.

During the exploration of precast building technology, some enterprises have invested human, material and financial resources in the research of multi-storey small high-rise steel structures and built some demonstration houses, but they have failed to solve some problems of the steel structure itself, such as poor sound insulation and poor comfort (the “good” problem has not been solved); The cost is significantly higher than that of traditional technology (the problem of “saving” is not solved); There are still a lot of on-site operations, and the construction speed has no significant advantage (the problem of “fast” has not been solved)..

In view of why we should vigorously develop factory assembled buildings, Wang Tiehong believes that China’s existing construction technology path (called traditional technology) was formed in 1982, that is, reinforced concrete cast-in-place system, also known as wet operation.