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

The fifth is the soaring labor cost, difficult recruitment, management and quality control.

Second, the water consumption is too large.

Source: In the two sessions of China Building Materials News, Li Keqiang said that urban planning and construction management should be strengthened.

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

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

Rebar Cap

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

The components are manufactured and installed in place in one step in the factory, and the site is installed quickly.

“The technical path adopted by sustainable buildings is the component and integration of steel structures, which has realized the similar standard container transportation, greatly reduced the shipping costs, and solved the bottleneck of the transportation radius of general precast buildings.

It completely replaces traditional technologies and is more energy efficient (80%), steel saving (10% – 30%), concrete saving (60% – 70%) and water saving (90%).

“The sustainable building that can be built in the future is a ‘six saving and one environmental protection’ (that is, more energy saving, land saving, water saving, material saving, time saving, investment saving and environmental protection) building, which conforms to the concept of circular economy, is good, economical and fast, and has realized 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 has led a special research team to conduct in-depth follow-up research on the great feasibility of construction for five times, has highly praised this.

The third is the precast and precast building with all-steel structure represented by the Yuanda factory sustainable building.

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

It is reported that Yuanda Kejian built the 57-storey “Small Tiancheng” in Changsha in 19 days, setting a new record for high-rise buildings with an average construction speed of 3 floors per day.

The cost is further reduced, which is close to the cost of traditional technology.

Most of them are reinforced concrete core tube+steel frame structures, and still have not completely overcome many disadvantages of traditional technologies.

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

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.

The component conversion rate is 80% – 90%.

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

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

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

This building model is suitable for high-rise and super-high-rise office and hotel buildings, and some are applied to residential buildings.

On the basis of traditional core technology, it focuses on the industrialization of steel structure parts and components as far as possible, and also extends to the integration of on-site decoration, with the componentization rate of 30%~40%, emphasizing the integration rate.

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

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

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

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

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

There are three models in summary.

The development prospect of factory-assembled buildings can be expected.

The cast-in-place system uses more than 12 tons of water per square meter.

On the basis of traditional technical framework and frame-shear wall, it focuses on the componentization of exterior wall panels, interior wall panels, floors, etc.

Among them, about 1/7 of them are analyzed according to the number of projects, about 1/5 of them are analyzed according to the building area, and about 1/4 of them are high-rise and super high-rise office buildings, hotels, and apartment buildings.

Now the annual completed housing area reaches 2.5 billion square meters, and the annual water consumption exceeds 30 billion tons.

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

In addition to the requirements of energy conservation and emission reduction, it is necessary to accelerate the transformation and vigorously develop and promote factory-assembled buildings.

The highly standardized and integrated technology reduces the cost by 1/4~1/3 compared with traditional technologies, which can achieve the construction of 1~2 floors per day.

The third is that the construction site is dirty, messy and poor, which is often an important pollution source of inhalable particulate matter with PM10 or more in cities.

It can be built in about five days.

This shows that the traditional technology has not been changed.

The second is the precast steel structure buildings represented by the southeast grid structure, CSCEC steel structure, Hangxiao steel structure, etc.

We believe that it will become a key point of the” the Belt and Road “strategy.” Wang Tiehong particularly emphasized.

The componentization rate is 40%~50%, and extends to the integration of on-site decoration.

In the exploration process of precast building technology, some enterprises have invested human, material and financial resources in the research of multi-storey, small and 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).
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