China FAMOUS Steel Engineering Company Company News

The advantages of building a steel structure villa: the steel structure has good stability, and the stability of the steel structure villa is very strong. The construction period is relatively short. Before the construction of the villa with the steel structure, all the engineering components have been completed, so the construction of the steel structure villa is relatively simple and takes a short time. The price of the steel market is relatively stable, and the price of building steel structures is relatively cheap. Light steel villas have various color shapes, such as strong adhesion and leakage resistance, short construction period, earthquake resistance, wind resistance, thermal insulation, moisture resistance, and high use space. Most of the building materials used are recyclable and green and energy-saving. . Light steel villa installation process, so that everyone has a clearer and more intuitive understanding of it. Light steel structure has light weight, less earthwork for foundation construction, little damage to land resources, and reinforced concrete strip foundation is generally adopted for foundation. Because the weight of the steel structure house is only 1/4-1/6 of the reinforced concrete structure house, the basic treatment is relatively simple. The connection between the steel structure and the concrete foundation is embedded with 10-12 corner bolts along the load-bearing wall, and the spacing is generally 1.2-1.5 meters. Considering the requirements of earthquake resistance and wind resistance of the house, galvanized flat iron shall be embedded at the corner of the house to connect with the steel structure. According to the design drawings, the main components are directly assembled at the factory after the production and transportation. The component area is small and the thickness of the envelope structure is small, which can increase the use area of ​​the building. After the waterproof treatment on the flat foundation, the dragon skeleton is installed. The light steel keel is a double-sided aluminum-zinc-plated steel, which not only has good toughness and ductility, but also ensures that the house will never collapse during an earthquake. The distance between light steel keels is scientifically calculated to ensure the overall safety of the house. The truss structure between the floors ensures the stability of the structure, increases the stability of the steel structure system, and forms a stable structure of the steel structure physical system. The wall of the light steel villa is combined with the current civil engineering technology and the fireproof and moisture-proof insulation technology, which can install the water and electricity pipelines in the wall in advance, which is conducive to the neatness of the house, unlike traditional houses that require red brick and concrete wiring and water and electricity Wake up and remodel. The wall of the light steel villa is composed of installing functional boards. There are many kinds of functional boards. Commonly used are fireproof, waterproof, noiseproof, thermal insulation, thermal insulation and various wall hangings for decoration Edition etc. The roof treatment is similar to the wall installation, except that the sun protection layer and waterproof layer are added, and the top layer is covered with another tile. At present, there are many types of tiles, including cement tiles, terracotta tiles, asphalt tiles, and metal tiles. A variety of colors and patterns can be selected. External wall sealing board The external wall osb board ensures the integrity of the structure. The exterior decoration materials include American PVC hanging board, cement wood grain fiber board, metal carved board, etc. It is environmentally friendly, durable, beautiful and diverse in color! The materials of the interior wall can be selected according to your own economic conditions.

The prefabricated structure refers to the construction of the building pre-fabricated in advance in the factory or on the construction site or elsewhere, and then the construction of these buildings is transferred to the construction site by means of transportation, through the cooperation of a certain splicing technology and some mechanical lifting, The building structure is constructed by assembling these scattered prefabricated buildings into a whole. With the sustained and rapid development of China's economy, the continuous increase in labor costs, and the increasing awareness of energy conservation and environmental protection, in recent years, China's research on prefabricated structure construction has gradually increased, and many units have developed some technologies. the study. Among them, the representative Vanke enterprise has become a pilot real estate enterprise of prefabricated structure construction in my country, has completed more than ten projects of actual size, and obtained good economic benefits. 1 Classification and advantages of prefabricated structure 1.1 Classification of prefabricated structures Prefabricated buildings can be divided into two categories according to their degree of assembly: (1) Fully assembled. All components of this type of building are just like mechanical production products, which are produced in batches in the factory and then transported to the construction site for assembly. These components mainly include assembled large slabs, beams, frame structures, slab-pillar structures, box structures, etc. The maintenance structure around the fully assembled building can be masonry or pouring on site, as well as prefabricated wall panels. The main advantages of this fully-assembled building are the high production efficiency of building components, the quality of mass-produced components is guaranteed, the construction speed of direct splicing is fast, and the seasonal impact during the construction process is small. Large and relatively stable areas, if factory production of building components will achieve better results. (2) Semi-assembled type. The main load-bearing components of such buildings are partly prefabricated components and partly will be built on site. For example, in building structures, brick walls are generally used for vertical load-bearing, so such components can be masonry on site. Like floors, beams. Stair platforms and other horizontally load-bearing components generally use prefabricated components for site hoisting. In large-scale buildings, a common practice is to use prefabricated components for the outer wall, and the inner wall is usually cast-in-place using formwork. The main advantage of this type of construction is that the one-time investment cost of the required production base is less than that of a fully assembled building, the adaptability is more extensive, a large part of the transportation cost is saved, and it is easy to promote. Under certain conditions, it can also achieve the effect of shortening the construction period, which is more conducive to the realization of large-scale flow construction in various places, and can obtain good economic effects and better structural integrity. At present, relatively more semi-assembled structures are used in my country's buildings, which are assembled monolithic structures. 1.2 Advantages of assembled structure According to foreign statistical data, the advantages of prefabricated buildings were introduced in terms of construction speed, engineering cost, etc.: (1) Saving labor. Also according to the data, the average time for a square meter in France is 20 man-hours per square meter, but after using prefabricated buildings for industrial production. After the assembly technology is used in construction, the man-hours per square meter fell to 11.5 man-hours. Obviously, when it was changed to a prefabricated building structure, construction labor savings by nearly 50%. In addition, it also reduces the intensity of labor. (2) Shorten the construction period. In Japan, under normal circumstances, a 100-family five-story residential house with a traditional construction method requires a construction period of 240 days. However, prefabricated buildings and building components are pre-fabricated at the factory and carried out on site. After the construction method of mechanical hoisting, it took only 180 days to complete the construction of a five-story residential building of 100 households, which shortened the construction period by 25%. (3) Reduce the cost. When the prefabricated structure and industrial construction methods are adopted, the construction cost per square meter is lower than that of the traditional structure. However, due to the different economic conditions of various countries, the structure of the building is also very different, so the cost reduction data are also different.

In recent years, the strong market demand has made the steel structure industry popularized and continued to develop. The steel structure has also been widely used in construction, railways, bridges and residential areas. Tens of thousands of steel structure enterprises of all sizes across the country are advanced in the world. The steel structure processing equipment has fully promoted the rapid development of steel structure. Zhang Xuezheng, deputy to the National People's Congress, Secretary of the Processing Party Branch of Laigang Group Jinan Laigang Steel Structure Co., Ltd., and head of the manufacturing department, put forward his own suggestions on how to promote the industrialization of the steel structure industry.   Status quo: Lack of industrialization chain, backward industrialization Seriously restrict the development of the industry   Zhang Xuezheng said that there are many problems in the steel structure industry at present. The steel structure industry has a huge market and a huge industry. The competition is also extremely fierce, and disorderly competition has caused a waste of social resources. In addition, steel structure buildings have the advantages of less floor space, low overall cost, fast construction speed, and environmental protection. However, the current development of domestic steel structure houses, steel structure bridges and other fields is relatively lagging behind. "Masonry houses and bridges still dominate, and there is no uniform standard for steel structure processing, which limits the development of the industry."   In the production link, Zhang Xuezheng believes that due to the lack of an effective industrialization chain, the production link is generally separate, and most of the steel structure processing enterprises have capacity bottlenecks. Moreover, the industrialization and backward industrialization of the steel structure processing industry, as well as the hidden dangers of safety and environmental protection caused by extensive processing methods. "Many steel structure processing enterprises' production equipment and processes are unable to meet market needs. Some are small workshops, which not only cause waste of resources, but also pollute the environment."   In addition, in the steel structure processing industry, the supply and thinking of sales of fixed production, as well as the age of the laborers engaged in the steel structure processing industry, the intensive personnel, and the lack of market labor, and other issues, have seriously restricted the development of the industry.   Way out: Strengthen government guidance and supervision and early warning mechanism Special funds and policy support to promote industrial upgrading   According to the current situation, what measures should be taken to promote the development of the iron and steel industry? After detailed investigation, Zhang Xuezheng believes that the government should first strengthen the supervision and early warning mechanism of the industry association to avoid the waste of social resources caused by excessive market competition. At the same time, on the basis of fully drawing on the industrialization development of advanced steel structure processing industries in Japan, Europe and the United States, the role of industry associations will be played to further promote the industrialization level of the steel structure industry and effectively solve the bottleneck in steel structure processing capacity.   To reduce waste of resources and environmental pollution, Zhang Xuezheng suggested that the competent department organize and improve the relevant laws, regulations and standards of the steel structure processing industry, and further standardize the safety and environmental protection law enforcement, so that the steel structure industry does not deviate from green, safe, energy-saving and efficient development Original intention. Strengthen industry self-discipline, increase law enforcement inspections of related industries such as prefabricated construction, and resolutely crack down on enterprises that fail to meet safety and environmental protection standards, and adapt or even deceive national and local policy support. High-quality development of iron and steel enterprises must focus on process reengineering, process improvement, and product upgrades, and the products will extend downstream and high-end, while the transformation requires financial and policy support. Zhang Xuezheng said that the competent department can further promote the industrialization, informatization and intelligence of the whole process of design, production, construction and maintenance of assembled steel structures through policy guidance, the establishment of special funds and the provision of low-interest loans. Break through "industry barriers" and promote the transformation and upgrading of related industries. "The policy should be perfect and effective. In addition to the funding policy, it should also promote the construction of the supply chain in the steel structure industry, and thus promote the transformation and upgrading of steel companies."

Since entering the 1990s, the development of steel structure buildings in China has been very rapid, especially the completion of some iconic high-rise buildings representing the city, which has opened a new page for the development of steel structures in China. For example, the 88-story, 420m-high Jin Mao Tower in Shanghai, which is the third tallest in the world, has been completed and is now in operation. Shanghai Pudong World Financial Center, which is said to be the world ’s highest height, has a 95-story 460m high and a building area of ​​310,000 m2. Construction is now being stepped up. The Dalian Presidential Building, which is invested by foreign investors, is being stepped up and is under construction, with a total of 95 floors. After its completion, it is said that its height will be among the best in the world. The development of light steel structure is in full swing, especially in the construction of industrial plants. It can be seen from the substantial increase in the number of steel structure manufacturing and construction companies. For example, Shanghai ’s steel structure manufacturing and construction units have grown from dozens of originals to more than 400 at present, and Baosteel in Shanghai alone has Nearly one hundred steel structure manufacturing plants. Under the great situation, how to make good use of the situation and grasp the quality of design and construction is a very urgent issue at present. This article intends to give a brief introduction to the advantages of light steel structure, material selection and design points, plastic design and the use of web buckling strength and skin effect, which will help readers have a more comprehensive understanding of light steel structure.   Light steel structure industry and its scope of application The so-called light steel structure usually refers to the structure composed of the following steel materials: ① cold-formed thin-walled steel structure; ② hot-rolled light-weight steel structure; ③ welded or high-frequency welded light-weight steel structure; Structure composed of welded composite beams and welded composite columns.   1. Scope of application According to the current situation in China, this structure has been widely used in single-storey industrial plants, multi-storey industrial plants, office buildings, and non-load-bearing components in high-rise buildings due to its wide utility and obvious advantages. For single-storey industrial plants, usually H-shaped steel, welded connection is used as beam and column, C-shaped or Z-shaped light steel plate is used for purlin, roofing system or floor system is made of pressed color steel plate, and the top can be poured Concrete and profiled steel plates can be used as rebar, and can also be equipped with rebar if necessary. The wall enclosure can also be made of single-layer or sandwich-laminated steel plates, which can be filled with various insulation layers.   2. Main advantages (1) Short construction period: the biggest advantage of light steel structure is that all components can be spliced ​​and installed on site by the factory. It takes only 45d to 2 months for a small industrial plant, and 8 to 12 if reinforced concrete is used. About months. ⑵Good comprehensive economic benefits: due to the short construction period, it can be put into use in advance to obtain investment benefits in advance; more due to the use of brightly colored color profiled steel plates, which are beautiful and gorgeous, improving the dynamic sense of the surrounding environment; because the building itself has light weight In general, there is no need to make pile foundation, which can save investment; due to the use of polystyrene foam sandwich board or veneer plus insulation cotton and other measures, the effect of heat preservation, heat insulation and chapter insulation is good. The color steel plate is made of galvanized as the substrate and silicone as the surface, processed by two-divided and two-baked, and the durability is also good. According to the current market price in China, the cost of the light steel structure is already lower than that of the reinforced concrete structure. The greater the span of the plant, the more obvious its advantages, which is also a major advantage on which it relies on competition. (3) Good seismic performance: Because the steel structure is a flexible structure and light weight, it can effectively reduce the earthquake response and disaster impact, which is very conducive to earthquake resistance. China is a country with many earthquake areas. Steel structures should be widely used in the construction of earthquake areas, which can greatly reduce earthquake disasters and casualties. The painful lessons of the Tangshan earthquake should be remembered. At present, Tianjin has officially launched light steel structure housing. ⑷ is suitable for demolition and relocation: once the owner is not satisfied with the factory site or unexpected changes in the external environment, the entire building can be demolished within a short period of time with minimal loss, and all of these are not available in reinforced concrete buildings. It is precisely because of the many advantages of light steel structure, and with the continuous emergence of new products of fire prevention and anticorrosion in recent years, the shortcomings of poor corrosion resistance of light steel structure have been better solved, making it obtained in industrial plants and civil facilities Widely used.   Steel structure is generally divided into ordinary steel structure and light steel structure, and there is no obvious boundary between them. The calculation rules are the same. The so-called light steel structure is generally a type of structure with a small structural load, a small structural rod and a thin wall thickness. The main load-bearing structure is generally a portal steel frame, roof frame and net frame. Because the load acting on the light steel structure is small, the internal force generated by the structural effect is generally small, which makes the strength of the structure often not a problem. However, due to the small cross-section of the member and the small cross-sectional inertia, the structural As the stiffness also decreases, the overall and local stability of the structure becomes the main problem that must be paid attention to in the design. This is the characteristic of light steel structure. Knowing this feature, we can take corresponding measures, such as adding support and bracing to meet the slenderness ratio requirements of the rod, and adding stiffeners to meet the local stability of the component.   A. Features of portal frame structure Let's talk about our common portal frame structure. The structure of the portal frame light-weight house is generally composed of the main frame and the supporting system. The main frame includes: 1) the main load-bearing member-the portal frame; 2) the wall frame; 3) the purlin, etc .; the supporting system includes: 1) Vertical support between rigid frame columns; 2) Horizontal support between rigid frame beams; 3) Rigid tie bars and braces; 4) Corner bracing, etc .; As can be seen from the above structure, the support system occupies a large proportion, which is also the characteristic of light steel structure. The load acting on the portal frame house is generally: vertical load (structural weight, snow load, ash load), horizontal load (wind load, crane braking force), and seismic load (horizontal and vertical). Due to the light weight of the light steel structure, the response to earthquakes is also relatively light, which is very beneficial for earthquake resistance. B. Judge whether the structure is suitable for light steel structure Whether is light steel can be determined according to the size of the structure under load and the type of structure. 1. Floor and roof structure system: if it is a reinforced concrete floor or roof slab, the light steel structure cannot be used when the load is large; 2. Crane load: if there is a large tonnage crane, it does not meet the requirements of light steel structure; 3. Structural system: If the building is multi-story, or a relatively high single-story structure, it should not be designed according to light steel. C. "Domestic rigid frame light house steel structure technical regulations" CECS102: 2002 scope of application It is suitable for single- or multi-span solid web portal frame, with light roof and light exterior wall, no bridge crane or only medium and light working bridge crane with lifting capacity not more than 20t or Steel structure of single storey house with 3t suspended crane. D. The role of each member of portal frame Portal type rigid frame, the various loads on the building are mainly borne by it and transferred to the foundation. The connection between the rigid frame and the foundation has two forms: rigid connection and hinged connection. Generally, hinged connection should be used. When the horizontal load is large, the house When the height is high or the rigidity is high, rigid connection can also be adopted. The rigid frame column and the inclined beam are rigidly connected. The characteristic of the rigid frame is that the rigidity in the plane is large and the rigidity out of the plane is very small, which determines that it can bear the load parallel to the plane of the rigid frame when the horizontal load is acting, but it can't help the load of the vertical rigid frame.   Wall frame is mainly responsible for the weight of the wall and the horizontal load (wind load) acting on the wall, and indirectly transmits it to the main structure.   Purlins, bear the roof load, and pass it to the frame. The purlins are also connected to each rigid frame by bolts, together with the wall frame beams and the rigid frame to form a spatial structure.   Because the purlin and the wall frame beam are connected by bolts, the connection point is similar to the hinge, and because the slenderness ratio of the purlin and the wall frame beam is larger, under the action of parallel to the longitudinal load of the house, its transmission stiffness Limited, so it is necessary to set a certain number of rigid tie bars between the rigid frames of the roof. We just said that the rigidity outside the plane of the rigid frame is very small, so we must set up the inter-column support between the rigid frame columns and the horizontal support between the rigid frame beams to form a structure with sufficient rigidity;   Because the out-of-plane rigidity of purlins and wall frames is small, it is necessary to set braces (increasing support) to reduce the slenderness ratio in this direction;   For rigid frame inclined beams, the upper flange is generally compressed, the lower flange is tensioned, and the upper chord is generally not unstable due to the purlin connection. However, when the roof wind load is applied, the lower flange of the inclined beam may change its sign. The pressure becomes unstable, so it is necessary to install the support. In addition, the portal frame and the foundation are connected by anchor bolts. When the shear force formed by the horizontal load is large, the bolts must bear these shear forces. We generally do not want the bolts to bear this part of the shear force. It does not consider its role, but sets the shear key between the column foot of the rigid frame and the foundation to bear this part of the shear force.

200 tons C-shape DHS galvanized steel purlins girts exported to Oceania on May.13, 2020.   The quality of our products has been recognized by customers, and customers are placing orders one after another. If you have a demand for steel structure products, please feel free to contact us.

Our company has a new plant, located in Fuyang, Hangzhou, with an area of about 30,000 square meters. The factory has multiple production lines, including DHS purlins, Conflor metal floor decks, steel structure members, etc. Welcome your visit.

450 tons steel structure members and DHS purlins exported to Oceania on Apr.19, 2020.

260 tons Galvanized Composite Floor Deck exported to Oceania on Apr.15, 2020.

350 tons C/Z-shapee DHS galvanized steel purlins girts exported to Oceania on Apr.15, 2020.

2 sets cold roll forming machine (automatic change C/Z-shape purlin) exported Oceania on Mar. 22, 2020.