Into the construction line, explore the development of Hainan prefabricated building industry
"Building a house is like building blocks" - this is the image of the construction industry for prefabricated building construction. With advances in technology, it is possible to prefabricate floor and wall panels in factories, transport them to construction sites, and then assemble them together. In fact, this kind of building like "building blocks" is more and more common in Hainan.
According to statistics, Hainan's prefabricated building area has doubled for three consecutive years, and by 2020, the province's prefabricated building construction area has reached 11 million square meters, and it is expected that the prefabricated building construction area will reach 17 million square meters this year.
How fast can prefabricated buildings be built? Is the house strong enough? Why does the government want to promote prefabricated buildings? With these questions, Hainan Daily reporter into the prefabricated building construction line for interview.
How fast can prefabricated buildings be built?
It only takes three to four days to build a floor
On March 29, several tall buildings, some of which have been topped out, are rising in the Haikou Financial Center project in Haikou's Jiangdong New District. At the construction site, there is no accumulated garbage, no sprinklers to deal with dust, and even the noise of electric welding is not heard.
"The assembly rate of our projects reaches 50 percent. Components such as floor slabs and laminated panels are made in the factory and shipped to the site for assembly, so there is not as much pollution and noise." Zhang Prosperity, general manager of Shenzhen Company of China Railway Guangzhou Engineering Bureau, the construction side of the Haikou Financial Center project, said that compared with the traditional building mode, most of the main structural components of the prefabricated building are modular production on the factory assembly line, and the cast-in-place operation is greatly reduced, greatly reducing the construction waste, which is very energy saving and environmental protection.
Not only that, because the prefabricated parts can be manufactured in the factory in advance, the construction time and construction personnel are reduced, and the construction is safer and more reliable. "Such a construction project with a total area of 80,000 square meters needed at least 600 workers in the past, and it took seven to eight days to build a floor. Now we only need more than 200 workers, and it only takes three to four days to build a floor, which is very labor-saving and time-saving."
Is the house strong enough?
The factory manufactures parts in millimeter size
It only takes 3 to 4 days to build a floor. Is the quality of the house built by prefabricated buildings reliable?
"The prefabricated parts that are made in the factory are made according to the designed mold size, which can be down to the millimeter level, so that the components fit together seamlessly, like assembling a car." Zhou Zhou, executive manager of the project of Haikou School Affiliated to Peking University, said that the academic center building of the project is a large building with a construction area of about 50,000 square meters and a height of 24 meters. Such a large volume and complex structure of the building, the use of prefabricated steel structure construction saves 5 months of construction time.
In addition, compared with traditional construction methods, prefabricated buildings produce parts in factories that are not affected by the natural environment such as bad weather, the construction period is more controllable, and the industrialized way is less or even independent of human factors, effectively avoiding the common problems of traditional buildings such as water leakage and horizontal deviation.
"From the beginning of the design of the academic center building, wind resistance and earthquake resistance are taken into account, and in the foundation pit construction stage, seismic isolation rubber supports are set up to isolate the superstructure from the foundation, which can effectively isolate the seismic force of 70% to 80%." In addition, the Academic Center also chose to use the enhanced vertical edge double bite infinite shrinkage high rib metal roof system, which is safer, better wind resistance, and easy to install, and can withstand typhoons up to 17." Tour introduction.
In fact, not only the academic center building of Peking University Affiliated High School Haikou School, our province requires that the prefabricated buildings located in the seismic fortification intensity of 8 degrees (including 8 degrees) or higher seismic intensity areas, belonging to the key fortification class or special fortification class, should use isolation and shock absorption technology, and encourage other types of prefabricated buildings to use isolation and shock absorption technology.
Why the push for prefabricated buildings?
The outstanding advantages of energy conservation and environmental protection are in line with Hainan's development
At present, the construction industry recognizes that the cost of prefabricated construction is higher than that of traditional construction methods. So why is our province still pushing prefabricated buildings?
"Compared with traditional buildings, prefabricated buildings have incomparable advantages in construction quality, construction period, energy saving and environmental protection." Wu Yachun, secretary of the Party Committee and chairman of Hainan Construction Group Co., LTD., introduced that prefabricated buildings have the advantages of high industrialization, short construction cycle, convenient transportation of components, and green environmental protection, which is very in line with the development requirements of the strategy of building a national ecological civilization pilot zone in our province.
Since the prefabricated building market in our province has just started, how to reduce costs is the key. In the past three years, our province has continued to promote prefabricated buildings through policy guidance, and actively promoted prefabricated buildings from public building projects invested by the government to introduce prefabricated parts production enterprises, and some cities and counties have also accelerated the rapid development of the prefabricated building market through tax relief, optimization of bidding and other supportive measures.
With the expansion of the application scale of prefabricated buildings, many construction units and developers have also found that the labor cost of the construction industry is gradually increasing, and the call of the government to promote green buildings is rising, and the advantages of prefabricated building construction are gradually emerging.
"From the construction cost (housing construction cost and housing facilities and equipment installation cost) consideration, the cost of prefabricated construction is higher than the cost of traditional construction, but from the overall project point of view, prefabricated construction can shorten the construction period, reduce human investment, coupled with safety, environmental protection, reliable, prefabricated construction advantages are obvious, is the future trend of development." "Mr. Zhang said.
Prefabricated buildings are gradually entering the life of Hainan people. At present, in addition to the public buildings invested by the government in our province, the commercial residential projects of large developers such as Country Garden and Vanke have adopted prefabricated buildings. According to the provincial Department of Housing and Urban-Rural Development, it is expected that the construction area of prefabricated buildings in our province will reach 17 million square meters this year.
The industry believes that with the expansion of the scale of prefabricated construction, there will be new changes in the design, production and construction mode of construction projects, project process management mode, and the use, decoration, property management and other fields after the delivery of construction projects.
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