steel shed construction industry: continues to improve performance period

Around the landmark building have completed the steel industry is pushing to accelerate progress. Recently, the world's first steel structure of the TV tower - Central Plains Fortaleza began operating this steel tower is a landmark Henan, the world's first high than the entire steel structure Ukraine Kiev TV Tower 8 meters high, while France Eiffel Tower 64 meters high,

To become the world's first high steel shed. "Shanghai Center" to be completed in 2014 the main use of steel; 12 of the Guangzhou Asian Games venues to be built in 11 for the steel body. Completion of a large number of landmark buildings and steel industry development will become a good endorsement. Increasingly strong desire of the pursuit of green building era of low-carbon economy, industrialization of construction is to achieve a low-carbon construction, an important way for green production, the steel structure is an important way to achieve architectural industrialization. Steel structure with easy installation, reducing the wet work, recyclable steel resources, save on labor costs, and many other advantages, occupy an important position in the construction of industrialization.

Industrialization of residential construction, Japan, the United States, Australia has become the most typical of the country. In order to promote the development of green buildings in China, China's Ministry of Housing will also take a series of encouraging policies to promote the development of the steel industry, such as the preferential interest rates of home loans, the reduction of property tax, to formation "Yijiangdaibu" system. 2011 the Ninth China Steel Structure Gold Award Award, National Steel leading enterprises winning a lot, such as Seiko Steel 13 project winning Hangxiao Steel 4 winners, southeast grid of eight award-winning, built in steel constitutive 15 winners, the relative concentration. The industry classic project awards the appraisal also help to enhance the visibility of the leading enterprises in the country, thereby increasing the market concentration of the steel industry. "Twelve Five" is still steel construction stage of rapid development, China's steel production in 2015 will reach 50 million tons,

Leading enterprises in the long-term high-speed development of performance can be expected. Financial experts predict the development of the steel structure in the "12th Five-Year" period, China: First, over the past 10 years, coastal economic undertake international industrial transfer, the construction of the factory of the world to promote the light steel demand over the next 10 years, facing rising labor costs and the yuan appreciation pressure will inevitably migrate to the Midwest. The new government will promote the transfer of industries and upgrade also needs a large number of plant construction. This means that China, the factory of the world mobile edge in the next 10 years while the upgrade, to bring the same light steel demand. Second, with the significant increase in labor costs and the price of cement, concrete housing structure costs will increase, mechanized steel shed housing will gradually narrow the cost gap compared with the future in areas such as commercial real estate will usher in large-scale use of the steel structure of the inflection point,

Such as the train station airport. Steel structures listed in the first quarter of this year, the company's performance began to prove the above judgment. Brokerage research, it is estimated that 1 quarter results and newly signed contracts will be established in the steel industry, represented by Seiko Steel will usher in the view of the rise of explosive inflection point.

steel structure workshop lattice boom mobile crane repair

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steel engineering construction common quality scores and preventive measures

Steel the member tube ball node plus liner, each weld expansion should be 1.5-3.5mm, without the liner, the each welds expansion should 1.0m2.mm, caulking steel nodes, each node in the amount of expansion should 2.0m3.Omm .. Steel Ruler sure unanimous Proofing and contemplate measure change negative.

Assembled or pre-assembled the assembly unit should operate on the in chronological size like, do not grasp the size chosen .. unit construction deflection happens in the steel structure folded normal there should be remaining just bracket bracket mounted on the screw steel engineering k to mobilize the steel structure deflection. basis for the steel structure type, size, and practice conditions, installation operation are appropriate to mobilize, so that the deflection value is less than the design values ​​of deflection Steel Components production grid steel structure construction process


The steel structure is damaged, we want instant instant solution, steel grid introduced steel structure damaged main factors: a change in the steel structure carrying capacity by load changes, extended service, rules and regulations; 2) components due accident deformation, distortion, disability, depression, resulting in the member section weaken rod warp connect cracking on; 3) caused by the temperature difference between the role of the member or connection deformation, cracking and warping; 4) due to chemical substances erosion corrosion and electrochemical corrosion of the steel structure weakened member section; 5) steel engineering  violations include mistakes in the design, production, construction and service midterm use and operation. Double-sided submerged arc longitudinally welded pipes steel structure the application of quality control of large span steel structure cable-membrane structure

steel structure warehouse roof truss construction safety measures

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China steel structure the altitude assembly method according to the structure type and construction conditions

The overall installation method or altitude slip method to install steel truss installed altitude assembled, assembled bracket position in the design and erection of the crane to the grid component sub-parts (or block) hanged to the design of the air position bracket assembly. This method is sometimes no large lifting equipment, but the large amount of assembled bracket, aerial work. Strength bolts connecting the steel truss or bolted spherical joints made of steel pipe truss with China steel structure is more appropriate, there are still some of the construction of steel grid method has been applied

Overall installation method is assembled into the ground on the first grid as a whole, and then use the lifting equipment to enhance the overall design position be fixed. This construction method does not need tall assembled bracket, aerial work less easy to ensure the quality of the welding, lifting large lifting equipment, technology is more complex. Therefore, the steel ball node grid (especially the three more rods to the grid and other grid) is more appropriate. Depending on the equipment used, the overall installation method is divided into multi-machine method lift crane, pull the lever to enhance law jack enhance jacking up method.

This method is used for height and weight are not large, the small grid structure. Prior to installation in the ground grid the the dislocation assembly jobs (ie, the assembled position with the mounting axis shifted by a certain distance, to avoid pillars position). Crane (mostly crawler cranes, mobile cranes) assembled good grid as a whole up to the top of the column above, in the shift of the air to fall into place fixed. In order to prevent the grid to enhance the overall collide with pillars the stagger distance depends on the grid to enhance the clear distance between the grid with columns or pillars corbel process, shall not be less than 10 ~ l5cm grid assembly to consider convenience and the air is displaced to facilitate the work of the crane. Required consultation and design unit, part of the edge of the space truss rod pieces left to grid upgrade after welding, or change some of the impact grid to enhance the pillars

After the processing of the metal structure factory, steel truss, single plane truss or three-dimensional truss makes up a small unit transported to the site, site assembly that is in the assembled position of the small unit the truss makes up the entire grid. The grid assembled the key, is to control the size of the axis of the bearing of a good grid framework (pre-amp welding shrinkage amount) and bagging requirements.

Grid welding sphere with steel pipe welding. General strength butt welding, for safety reasons, the increase in the butt at 6 ~ 8mm fillet weld welding. Wall thickness greater than 4mm weldment groove interface should be made. For the uniform and steel pipe butt weld length slightly adjustable, plus casing. The first assembly mounted on the bottom chord afterloading diagonal web members, to be between two truss steel pipe all placed and correction, and then gradually root welded steel pipes such small grid multi-purpose four-crawler up vertical machine ( or car tire crane) lift crane, also with two crawler cranes, or a lever lifting.

If the smaller grid weight, or four cranes lifting capacity to meet the demand should be four cranes arranged in both side of the grid, so as long as four crane slewing the requirements to complete the grid air shift, multi-machine The key is to lift crane a crane China steel structure or some cranes will overload the grid torsion weld cracking. For this reason, before lifting to be measured most crane lifting speed, in order to grasp when lifting. When the grid lift crane to about 30cm higher than the top of the column elevation air shift, move the grid above the top of the column. Grid settled down for the grid produced midline accurately capitals midline agreement prior the grid four corners of each tied to a wire rope, using inverted chain in place on the line

The arrangement of the cable wind rope should enable multi uprooted rod integrally connected with each other, in order to increase the overall stability. The Each uprooted rod at least 6 wind cable rope, the wind cable rope according to the wind load, hoists, pull lever skew, wind cable rope initial stress load, calculated according to the most adverse circumstances combined select. Ground anchors also need to be calculated and determined.

steel pergolas process jingta

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Fireproof coatings use of countermeasures

The countermeasures problems in the use of fireproof coatings
(A) to strengthen publicity and education to enhance their understanding. Steel structure engineering fire hazard causes are many, but a very important reason for thinking and understanding is steel structurenot in place, contempt fire prevention of the illegal construction of luck.The fire department should make use of newspapers, radio, flyers, and other forms of extensive publicity on fire prevention, organizational design, construction units, the training of fire codes and laws and regulations to improve the level of business theory and law enforcement abiding sense of design, construction personnel. Conditional can also take advantage of the actual case of fire, visits to the scene of the fire; take advantage of the news media and public disclosure of fire losses and casualties; convened fire responsibility to publicly address the General Assembly, so deeply rooted awareness of fire safety in the entire society everyone. 

(B) the correct selection of a variety of fire-resistant coating. A wide variety of fire retardant coatings market, its fire performance are not the same. Therefore, must be full investigation of the role of fire retardant paint varieties grasp its performance, and in accordance with the substrate coating normal use conditions and fire environmental conditions, such as the right choice varieties of fire-resistant coating. Thin, ultra-thin or thick fire retardant paints can not be indiscriminately on for all steel structure fire protection, must be in accordance with the building fire risk, environmental conditions, production technology, value protection aspects to be taken into account, truly fireproof paint fire performance.
(C) strengthen the supervision and management, good production and sales shut. Fire resistance and physical and chemical properties of test report products sold must be qualified by the national testing organizations in order to sell the factory, and shall be accompanied by the manual, indicating the technical steel structureperformance, manufacturing batch number, storage period, the scope of application. Fire supervision departments respond to each batch of fire-resistant coating to the factory quality sampling and testing its packaging, labels, indicating compliance with the requirements. All operating units of the fire retardant coating, purchase required to contact the manufacturer for product brochures and other information provided to the user in the sales brochures and other information, and the implementation of the operating systems listed, marked with the manufacturer of the product, technical performance, product testing organizations, the scope content. The fire supervision departments should track supervision, regular or irregular spot checks of product quality, mastery of the marketing staff expertise and after-sales service. Violation of the provisions of the production of substandard products, endangering public safety by or unlicensed, unlicensed operators, according to the law strictly, sales of fake and shoddy products, in conjunction with the industry and commerce, quality supervision and other relevant departments to resolutely crack down on the majority of maintenance users and the interests of the masses. 

(D) to strengthen the supervision of the construction site, testing organizations. Book issued an audit opinion, the fire department should expressly require the the fireproof coating construction unit shall have the appropriate the construction qualification to undertake the project, at the same time to track the construction site supervision services. Such as before brush fire retardant coating, require the construction unit first surface rust and rust treatment is determined according to the requirement, the steel surface debris should be cleaned and the gap junction applications of fire retardant paint or other fireproof material to fill the blocking level before construction. Should maintain good ventilation, rainy days or when the surface of the steel members condensation, unfit for the job. Because of the rapid construction of fire-resistant coating, strengthen the supervision and inspection of the construction site, it is extremely important. Check through the construction site, you can master the basic situation of the construction team and the progress of the project, the quality is good or bad, whether the product is qualified. Also only field inspection and supervision, to discover hidden promptly rectification hidden to avoid unnecessary losses. In addition, to strengthen the detection units of firefighting agency management efforts, and correctly guide industry self-awareness, strict testing specifications and requirements, to give the corresponding penalties for a false report or larger error detection unit, until the abolition of their qualifications.
(E) strict acceptance criteria to ensure that the quality of the project. Fire department in the construction unit to apply for acceptance requirements before the first request to provide intermediary testing organizations test report and construction records, including the records of the hidden works, at the same time the fire department in the site acceptance process to grasp the following requirements of the classification and acceptance: The coated thin fireproof coatings to comply with the following requirements: 1 between the coating and the steel substrate and coating firmly bonded between, such as delamination, hollowing; 2, coating thickness to meet fire resistance design requirements; 3, the appearance of the coating to be smooth, clear contours, color uniformity, no obvious depression, chalking, loose laitance, mastoid have been removedsteel structure from any individual cracks, its width should not be greater than 0.5mm. Thick coating fireproof coatings to meet the following requirements: 1, between the coating and the steel substrate and coating bonded firmly and completely closed, such as delamination, hollowing; 2, coating thickness of 80 area% (inclusive) to meet the design requirements for fire resistance, and the thickness of the thinnest should not be less than 85% of the design thickness; 3, the appearance of the coating should be smooth, without significant depression, chalking, loose laitance , have been removed from any individual cracks mastoid, its width should not be greater than 1mm. Acceptance When you encounter one of the following circumstances, should check whether its coating steel components connected to steel mesh, to ensure a solid coating: 1, withstand shock and vibration beam; 2, the design coating thickness is greater than when 40mm; 3, sticky lacquer strength is less than a coating of 0.05Mpa; 4, the web height of the beam greater than 1.5m.

New technology for steel the high corrosion coating rust

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The Comparison of the Series of the light steel structure workshop

Light steel structure workshop clear and simple recognition of the community. Analysis of the current situation, the construction of the building of the domestic and foreign enterprises in building performance gap between the following three aspects: (a) In essence, the gap in the architectural design concept, the architectural design of light steel still performs the existing various building codes, and concrete building is no essential difference. Its architectural concept is the use of special material, indeed a different place with concrete, and thus make the building performance of a variety of differences
1, the integration of building structural design is the design of concrete building design according to the structure after the first architectural design concept design, light steel building due to its special materials and advanced design software has enabled the design process to achieve the building structure one design, architectural design is completed with the structural design is completed at the same time. Light steel enterprises abroad are to follow such a philosophy, most enterprises are still running the design principles of concrete construction. Building design according to the design of concrete building design, structural design, on the one hand that it would demonstrate its architectural style, on the other hand, the destruction of a light steel building unique architectural features. For example, the light steel structure can achieve large span concrete structure is difficult to achieve. As architectural design engineers do not understand this situation, therefore, the design of the building may have been a small span of the building, which could lose the building has a grand and imposing large span building opportunities. This is mainly due to the current state-of-the-art design software causes many domestic and Design Institute. With the popularity of various state-of-the-art steel structure design software in the future, this problem will be solved satisfactorily.
Containment system, with the main structure design integration basic practices of Chinese enterprises in this regard is that the design of the main structure, the maintenance system designed separately, while the the foreign general practice is a unified design, even some companies still perform construction modulus made to ensure the accuracy of building the overall installation. For example, between the two uprights install interior wall panels, interior wall panels from the left column, row by the former practices, the board is a high rib to the right column are high rib. In fact, This indicates that by the practice of the former can not guarantee the accuracy of the installation, while the latter can ensure the accuracy of the installation.
Accessories system designed with the overall building systems integration building designed by the foreign enterprises in the installation, when the basic guarantee for the end of the installation, no extra accessories on the ground, there is no lack architectural accessories. The majority of domestic enterprises or small accessories or accessories. This is because the non-uniform results of the the accessory system design and the design of the entire building systems. Building performance can also be affected. Of course, there is also a standardized accessories. (B) Construction manifestations gap light steel building construction performance are mainly the following four characteristics that scale, lines, colors, and change. In these four areas, we are different gaps.
1, the construction scale: light steel structure workshop designed by foreign enterprises in building scale performance, the performance was very good, especially the a ridge Shuangbo or with parapet large span light steel building, has a grand building momentum. This building scale performance works of architectural styles, from the hands of domestic enterprises, yet rare

On-site fabrication and installation of steel structure color steel sandwich panel

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light steel structure Engineering and the Built Environment

Combining environmental building the second session of the National light steel structure Construction Technology Seminar held recently in Guangzhou, Housing and Urban-Rural Development Ministry of Science and Technology Division, Deputy Director Han Aixing at the meeting, the steel structure is also combined with the built environment. Hanai Xing pointed out, along with China's reform and opening up and economic and social development, while the development of the cause of building, steel structure has also been a lot of development, this seminar marks the steel structure from the earliest discussions not to the development of steel structure to now how to develop a steel structure, even in the steel structure of the research design stage into the construction phase.

Steel structure construction technology compared with other concrete technology, a lot of design technology is not important, relatively speaking, materials, theory in the design of the research phase is good to engage in the construction aspects with concrete and other terms, the construction little more difficulty and the problems encountered are a lot of aspects to re-examine the new understanding, especially since the recent situation of many of the new structure in the country generally build up a lot of new construction. Toward highly integrated building technology, many industries need a lot of technical, need to combine, under the present conditions, and energy conservation, the environment, the combination of this seminar is from more structural technology, construction and installation, welding, etc. discuss, which is the most basic and fundamental essence, throughout construction science, construction environment far not to these areas, the steel structure is also combined with the built environment. Hanai Xing pointed out that, in recent years, the domestic many strange building or steel building, mechanics, construction connection welding technology has made a breakthrough, but also had a certain impact on society and the environment,

Several light steel structure projects, environmental concept would think that the people living in the building work and live is inappropriate, not just from an environmental sunshine, wind, or my heart are inappropriate role. Some buildings in which to live will get sick. The environment created, this is a big premise can not be changed. According to reports, the steel structure construction technology exchange, is to sum up the experiences and lessons of the technical problems in the past major projects in the construction process, to discuss the steel structure project currently under construction, new materials, manufacturing processes, the installation program, application technology research, face new issues and new challenges, learn new construction techniques and construction methods.

The Assembly election held in Guangzhou, Guangzhou has built and are building a very influential group of international and domestic construction steel structure projects, such as the new Baiyun International Airport, Guangzhou New TV Tower, Pearl River New Town West Tower, Guangzhou Opera House, Pazhou International Conference Center, and so on. Some of these projects represents not only the construction of the highest level of China's construction sector, as well as the emerging space structure stadiums, and some are under construction engineering allows delegates to learn more intuitive design of steel structures and construction problems.

The VSR future and its effect-jingta

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Superfinishing surface quality influencing factors and control measures

Keywords: machinery and equipment parts surface quality control measures influencing factors
With the Superfinishing development of China's science and technology, to a large extent, promote the development of the machining industry, machining industry occupies a larger proportion of the market economy. Performance and service life of machinery and equipment, is an important criterion to measure the production levels of the corporate machinery, and the operating efficiency of the machinery and equipment by the influence of mechanical parts, if the quality does not meet the requirements of mechanical parts, when told running of the machinery and equipment, on will lead to lower efficiency equipment noise problem is serious, and even cause serious security incidents, therefore, to ensure the quality of the surface of the part, while the emphasis on the parts to use performance.

Analysis of factors that affect the surface quality of the parts
(A) production equipment factors
Mechanical parts in the production process, production equipment has a significant impact on the quality of products. In general, the production process of the mechanical parts need to go through the grinding process, the conduct of these production processes must be done by a professional production equipment support. However, due to the production equipment of the mechanical parts processing enterprises in China compared to the production line there is a big gap between the more developed countries, the production equipment backward production equipment accuracy and equipment productivity enough to affect the overall quality of the machine parts. For example, in the production process, the lack of stability of production equipment, there will be more substantial vibration problems in the production process of sanctification, so that the parts of the surface chatter marks, increases the surface roughness, thus deteriorating the quality of the machined surface. have serious quality problems.

(B) production of technical factors
Superfinishing parts processing, the production technology of choice, also determines the surface quality of mechanical parts. For example, under the same conditions, the carbide tool surface roughness of the machined parts to be significantly lower than the high-speed steel cutting tools, diamond, cubic boron nitride cutting tools production effect is more superior to carbide. However, in the actual production process, the production of parts of the material should be based on specific selection, otherwise, also the quality of the parts of the surface will have some impact. For example, the affinity of the diamond with iron-group material, making the processing of iron-group material parts are not suitable selection of diamond tools, or the production quality will be seriously affected. Meanwhile, in the production and processing of brittle material parts, the chips will appear in particulate form, if in the process of cutting swarf occurs problems such as chipping, causes parts of the surface more rough, and therefore, during the production before machining, must be considering the features and characteristics of the material, and to choose the production technology.

(3) other factors
In the process of mechanical equipment, will cause a certain impact on the quality of the surface of the mechanical parts, the main influencing factors including abrasion resistance, fatigue strength, and corrosion resistance, etc., if the mechanical parts of the property can not meet the conditions of use of the device and the construction environment, will be a serious impact on the life of the equipment and the use of mechanical effect. Therefore, in the actual production process, it must be comprehensive consideration of the relevant properties of machinery parts, machine machining surface quality and resistance, to ensure the normal operation of mechanical equipment.

Machining surface quality control measures
(A) to strengthen the introduction of advanced equipment
Add some product processing equipment, has a very large impact on the surface quality of the mechanical parts, therefore, strengthen the introduction of advanced production equipment, improve the overall performance of the production equipment, effective way to control the quality of the machined surface. With the continuous development of China's science and technology, the performance of production equipment and run effect gradually enhanced, therefore, must be to strengthen the machined surface quality control, to ensure that the use of machinery and equipment performance. Production business process, you should pay attention to the introduction and application of production equipment, improve the process parameters to reduce surface roughness to ensure the market competitiveness of the machinery and equipment.

(2) emphasize the machining method \
At present, it is possible to reduce the processing method of machining surface roughness ultra-precision cutting and ground roughness grinding method, and is responsible for the final step processing of ultra precision machining, grinding technology. Ultra-precision machining during mechanical parts processing, there are generally three forms of exercise, low-speed rotary movement of the workpiece, the grinding head axial movement as well as Whetstone three reciprocating vibration, three different running form, form is not repeated mechanical workpiece surface trajectory, to enhance the degree of smoothness of the surface of the workpiece. Ultra-precision machining process of cutting and grinding with grinding there is a big difference between the the rough workpiece production of ultra-precision machining, the workpiece surface wore off, the whole contact area will greatly increase the pressure also will swordsman, the workpiece will conjunction to form a layer of film between Whetstone Whetstone with the workpiece will not again be direct contact.
(C) improve the surface mechanical properties

Another method to improve the machining surface quality is reasonable improvement in the process, the physical and mechanical properties on the surface of the workpiece and to change the processing method, so as to achieve the purpose of increasing the surface quality of. Before conducting machining, we must first develop a reasonable processing process in order to guarantee the quality of the workpiece machining, the unloading surface quality processing to provide a reasonable scientific basis. In the process, you must select a reasonable cutting parameters reasonable cutting parameters is the suppression cutting BUE important factors can effectively reduce the residual processing area of ​​the height, to ensure that the workpiece surface smoothness of. Machining depth of cut and feed rate also has a direct impact on machining surface quality. Appropriate to reduce the main the declination and vice declination angle in the case of a certain amount of feed, and are able to effectively reduce the workpiece surface roughness. In addition, in the machining process, it is should be noted that to select the appropriate cutting fluid, to improve the coefficient of friction between the machining tool with the workpiece, effectively reduce the interaction between the temperature of the tool with the workpiece in the cutting work, so that the degree of wear of the workpiece to greatly reduce, to ensure the quality of the machined surface.
Summary:

Machined surface quality of the Superfinishing of the use of machinery and equipment and production efficiency has an important impact on machining surface quality problems, will result in greatly reduce the stability of the machinery and equipment, the use of performance greatly reduced, the noise problem is obvious, and even cause serious industrial accidents, therefore, must be emphasis on mechanical processing sectors, to take reasonable measures to improve the smoothness of the surface of the part to improve the effect of the use of parts. The same time, the actual production process, we must attach importance to the properties of the mechanical parts, such as the degree of abrasion resistance, corrosion resistance, fatigue resistance, for the use of the environment and conditions of use of the equipment, make full detection work to extend the use of mechanical products life, to ensure the healthy development of the machining industry.
Technology and the principle of Stress Detector voltage tester:http://steelprofileexport.blogspot.com/2012/12/technology-and-principle-of-stress.html