At the same time, steel structures show great potential for development."In 2018, the steel structure output was 687.4 million tons, accounting for 7.4% of the steel output, and the output growth was 11.84%;Overseas export of steel structure output reached 1.117 million tons."A few days ago, the deputy secretary general of China building metal structure association, building steel structure branch chairman of the party baowei in the national steel structure building industry conference announced to the whole industry last year building steel structure industry development data.
The same double-digit growth, indicating that the steel structure is becoming a "steel demand" new point of strength.
Good policy frequency steel structure heat does not decrease
In 2019, the national conference on housing and urban and rural construction proposed to vigorously develop prefabricated steel structure buildings and actively carry out pilot projects of prefabricated steel structure housing construction.In the construction of low-income housing and prefabricated housing in pilot areas, as well as renovation of dilapidated rural houses and relocation of poverty alleviation in inland-prone areas, a certain proportion of engineering projects shall adopt the steel structure prefabricated construction method, track the progress of pilot projects, improve relevant supporting policies, and promote the establishment of a mature steel structure prefabricated housing construction system.
At the same time, in accordance with the requirements for "much starker choices-and graver consequences-in" prefabricated building action plan, by 2020, our country to develop more than 50 prefabricated construction demonstration city, set up more than 200 prefabricated construction industry base and more than 30 prefabricated construction science and technology innovation base, the construction of more than 500 prefabricated building demonstration project, prefabricated building new buildings share will reach more than 15%.It can be said that steel structure in the heat of the construction industry.
In 2018, 2.76 million tons of steel were used in completed steel construction projects with a floor area of 24.5 million square meters, accounting for 0.6% of the 4.135 billion square meters completed in 2018.Steel structure construction projects are mainly concentrated in cities at sub-provincial level or above, accounting for more than 70% of the completed projects and more than 81% of the building area.
"It is worth mentioning that in the past two years, there has been new growth in steel structure buildings and steel structure houses in prefabricated building demonstration cities.Meanwhile, in terms of related standards, the 2018 prefabricated steel structure building and residential technology and product standards have been greatly improved."The party guards the introduction.
At present, hunan province has been included in the steel prefabricated housing construction pilot provinces.Zeng yong, chairman of hunan jinhai group co., ltd. and President of hunan steel structure industry association, pointed out that the transformation and upgrading of the construction industry should be based on prefabricated buildings, the future of prefabricated buildings should be based on steel structure, and the development of steel structure industry should be based on the support of policies and local governments.
By the end of 2017, 31 provinces (municipalities directly under the central government and autonomous regions) and some cities had issued implementation opinions or guidance on the development of prefabricated buildings and issued various preferential, encouraging and supporting policies.It can be said that the high attention of local governments is an important foundation for the rapid development of prefabricated buildings.
"With the strong promotion of national top-level design and industrial policies, prefabricated steel structure building, as an important system of prefabricated architecture, will embrace new development opportunities and challenges."The party defends point out.
Environmental protection and sustainable industrial prefabricated buildings have obvious advantages
In terms of construction mode, the traditional cast-in-situ system has played an important role in the urban and rural construction after China's reform and opening up."But the serious shortcomings of the cast-in-place system will lead to its gradual replacement by the emerging prefabricated buildings.""Said wang tiehong, President of the China construction industry association and former chief engineer of the ministry of housing and urban-rural development.
According to him, the fact has proved that the cast-in-place system has many disadvantages.It is extensive construction.Construction materials are transported to the site for secondary processing and waste of steel and cement is serious.Second, excessive water consumption.According to incomplete statistics, the average high-rise consumes 12 tons of water per square meter, which cannot be recycled.Third, environmental problems are prominent.The construction process will produce a large number of inhalable particulate matter, causing environmental pollution.Fourth, there are serious quality problems, such as cracking, leakage and so on.Fifth, there is a shortage of the new generation of migrant workers.
"After nearly 10 years of hard work, China's factory prefabricated buildings have made breakthroughs and are leading the world in many aspects.Here, I am responsible to say that any technology used in China must be the best."Mr Wang said.
Compared with the traditional cast-in-place mode, the prefabricated building has an obvious advantage.According to the three existing modes at present, the first is the reinforced concrete prefabricated building (PC), which is suitable for office and residential buildings of small and high buildings with a large area;Second, prefabricated steel structure building, suitable for high-rise, super high-rise office, hotel building, part of the application to residential buildings;Third, all steel structure prefabricated building, suitable for high-rise, super high-rise office, hotel, apartment buildings.These three models can completely replace the traditional technology, more energy saving, steel saving, concrete saving, water saving, parts conversion rate can reach 80%~90%, and the housing rate is high, no cracking and leakage problem.
"In terms of construction and installation cost, there are 11 super high-rise buildings in China, and the average construction and installation cost is as high as 13,000 yuan/m2 to 19,000 yuan/m2, excluding land cost, etc. If the all-steel structure is used instead, 1/3~1/2 of the construction and installation cost can be saved."Wang tiehong said.
From the perspective of market competition, steel structure means a larger market scope.The transportation radius of PC is 150~300 km, and the steel structure is 300~500 km."For local governments to invest in other places is to increase GDP, increase tax revenue and solve the problem of labor employment.Mr Wang said.
How to develop prefabricated buildings, wang tiehong thinks we should pay attention to three "perfect match" combinations.First, assembly +BIM(building information model).The Shanghai cooperation organization (sco) venue in Qingdao is an all-steel prefabricated building, which was completed in only six months. BIM is a great contribution.Second, assembly +EPC(general contracting mode).The use of EPC mode can save the cost of prefabricated construction.Third, assembly + ultra-low energy consumption passive.Passive ultra-low energy building refers to the envelope structure which ADAPTS to climate characteristics and natural conditions, has higher thermal insulation performance and air tightness performance, and has extremely low energy consumption.Wang tiehong stressed that ultra-low energy consumption passive has a broad development prospects.
Development space large steel structure housing "steel demand" potential unlimited
赣公网安备 36043002000135号
Hangzhou Forever Steel Co.,Ltd.
Jiujiang Eternal Construction Co., Ltd.
Forever Office Automation System