Cleaning up steel structure coating process technology improvement

In the steel production process, cleaning painting is extremely important.

Because of the objective existence of steel structure of large tonnage, large size characteristics, different in machinery industry.Product production process to how safe, is the premise of quality assurance, and create a green environment, clean and comfortable working environment, efficient, civilized operation, is always to perplex our problem.In order to meet the business development needs, after a long time of gestation, a comprehensive and multifaceted external information resources, integration and upgrade existing equipment, new energy saving and environmental protection, has self characteristics of new multifunctional steel structure assembly workshop, set steel, steel plate, steel cleaning rust, special-shaped structure of sandblasting, painting in one, fill the previous vacancy, overall train of thought of as follows:

1 pipe blasting cleaning

Shot blast cleaning machine has been cast in great quantities used in steel structure, machinery industry, for the processing of steel structure steel, steel, steel and other raw materials or shape and size can be designed in different sizes, the number of polishing head device.Aiming at the bar, pipe truss special production requirements, double spiral roller steel shot blasting machine workpiece input output design for tapered roller, roller is arranged at different position and polishing head, to achieve all-round shot blasting chamber.The walking motor speed, wide range of speed, can adapt to different specifications of the workpiece processing requirements, the outer wall of the steel tube cleaning disposable derusting grade reaches Sa2.5 - Sa3, changed the traditional primitive blasting process, with a high degree of automation, energy saving and environmental protection, the safe operation of the advantages, greatly improves the cleaning work efficiency, leading in the peer level, has been completed a large number of network engineering production, still play an irreplaceable important role.In the latest technological transformation, we on the original rotary blow back type dust removing system transformation, instead of the simple and practical space occupancy, low bag dust collector, water tank filter to form replaced stack emission.Compared with the common cartridge type dust collector, reducing the investment and running cost, through calculation and ensure the filtering area, to meet air processing requirements, simplifying the electrical control system, the operation is more convenient.The new steel structure assembly workshop the equipment moves recombination, unified classified management, make the equipment efficiency gets more sufficient play.

2 plate blasting cleaning

Steel shot blasting machine is the processing plate size requirements, design of different specifications, polishing head number of special steel plate processing equipment, which is characterized in the chamber body below the projection angle radiation surface design.With the business development, we relate more elevated bridges and other special-shaped structure processing, steel making greater use of steel plate pretreatment processing mode, if the general steel shot blasting machine processing, needs to produce a special bracket, the two loading and unloading turnover, heavy work efficiency is low, and the electricity consumption.Special steel shot blasting machine, Menfu to 3 meters, suitable for most sheet metal processing capacity range.Loading and unloading the input output table, disposable easily complete the steel shot blasting, the output end set pill blowing device, the timeliness of clean steel.Consider the development of future needs, the equipment can be upgraded to include a full set of Shotblast derusting, painting, drying, waste gas filter system of steel pretreatment line, to save space, simplify the operation process, eliminate ground paint pollution factors, Shotblast derusting spray paint finish, shortening after rust removal of steel oxidation time, effectively compensate for artificial processing efficiency deficiency.

3 steel blasting cleaning

Steel shot blasting machine is designed and developed according to the shape of the workpiece dimensions of different specifications, polishing head number of shot blasting equipment, which is characterized in the chamber body to different setting angle parabolic head, this equipment technology is already very mature.The shot blasting machine can also process the smaller size of the workpiece, mass production can make the special bracket, so that the workpiece can be placed in the projection angle radiation range reasonable position, operation open only need polishing head, effectively reduce the vulnerability of loss and electricity consumption.For some time structure and small pieces of generic profiles processing, we equipped with a non-standard pieces of shot-blasting machine, the roller of each set of 2 parabolic head, equipment structure and steel plate machine can complete the same principle, processing, without the two turn and shot blasting, avoid unnecessary consumption.Because of the huge equipment structure, equipment below ground foundation must be waterproof, prevent future equipment in the long-term use of water seepage, unnecessary trouble.Because of the high rate of equipment utilization, the frequent replacement of wearing parts, energy consumption, use improper operation cost increase, even appearing polishing head transmission bearing damage, damage of motor, Gangwan breakdown equipment enclosures and the like, must cause enough take seriously, prevent equipment failure becomes a bottleneck in production process.The new steel structure assembly workshop 4 shot blasting equipment to plan, to integrate resources, standardize the management.Steel pill device using maximum speed can reach 70m/s, high speed splash shot on the person with danger, must guarantee the cleaning chamber protective rubber curtain intact, operating personnel wear special protective equipment.Equipment used frequently in examination room in vivo protective plate and wear resistant lining board, shot blade, directed sets and other parts wear, damage is found to stop promptly replaced, prevent processing is not seasonable caused greater losses.

4 sandblasting derusting cleaning

Technical reformation of equipment, in order to better meet the needs of large special-shaped components cleaning painting, design and construction of full closed sandblasting room, sandblasting room size is 27m × 24m × 6m, sandblasting equipment selection for high performance pressure feeding type double cylinder double gun continuous sand blasting machine, output per hour up to 40m2 (two guns), continuous operation to meet the ergonomic requirements.Premenstrual process research, absorb helps reduce cost, improve the utilization ratio of the equipment structure, form a self characteristics of the equipment configuration.In our workshop crane covered work area, set the whole of the enclosed work areas are arranged on one side, a dedicated room (including sandblasting system, dust removal system, back to the sand system and all vent lines), the other end is provided with a labyrinth air inlet.Jet noise that are arranged on both ends of the gate, and convenient vehicle.Workpiece import available dual / single road car ferry transport vehicle, can also be transported into the open roof, use of bridge crane loading and unloading transport.Sandblasting room set abrasive automatic recovery system of belt conveyor, steel through recycling, the projectile and the dust separating after repeated use, avoid unnecessary consumption of the artificial.Dust discharge through a wind pipe, composed of a dust remover treatment compliance after discharge via a dedicated channel.

The roof design, using different from general sandblasting room form (using the landing door type crane import and sandblasting room to work to achieve the loading or turn over, or not setting the blasting room lifting function, being unable to turn over the malpractice of workpiece loading and unloading operations), the research and design of movable flexible roof.P38 tracks on both sides of installing 16 walking trolley, trolley mounted on 8 pieces of truss supporting, truss supporting span 25.5 meters, cross-sectional design into the inverted triangular structure, reduce the structure weight, in order to ensure the stability of roof movement.Foldable flexible roof is fixed at one end, pulled open and close of roof.In the selection of transmission form, design engineer considering rack, chain, wire rope traction and other methods, combined with the site conditions, considering the advantages of simple structure, low failure rate, convenient maintenance and use requirements, determine the wire rope drive traction running type.

All shot blasting equipment layout, fully consider the rust, paint site turnover requirement.The processing area to ferry vehicle track on all production workshop, complete the processing after the workpiece can be easily transported to the next process.In energy saving and environmental protection philosophy thinking ahead of workshop design.All around the wall mounted louvers, to ensure that the indoor and outdoor air circulation.Calculating air processing requirements, implementation within the specified time, exchange capacity.Shop paint area setting suction inlet, to the ventilation pipe output, by a special paint waste gas treatment device for purifying (with water spray, activated carbon absorption principle processing), reach the demand of environmental protection emission standard.

Because of the objective existence of steel structure of large tonnage, large size characteristics, different in machinery industry.Product production process to how safe, is the premise of quality assurance, and create a green environment, clean and comfortable working environment, efficient, civilized operation, is always to perplex our problem.In order to meet the business development needs, after a long time of gestation, a comprehensive and multifaceted external information resources, integration and upgrade existing equipment, new energy saving and environmental protection, has self characteristics of new multifunctional steel structure assembly workshop, set steel, steel plate, steel cleaning rust, special-shaped structure of sandblasting, painting in one, fill the previous vacancy, overall train of thought of as follows:

1 pipe blasting cleaning

Shot blast cleaning machine has been cast in great quantities used in steel structure, machinery industry, for the processing of steel structure steel, steel, steel and other raw materials or shape and size can be designed in different sizes, the number of polishing head device.Aiming at the bar, pipe truss special production requirements, double spiral roller steel shot blasting machine workpiece input output design for tapered roller, roller is arranged at different position and polishing head, to achieve all-round shot blasting chamber.The walking motor speed, wide range of speed, can adapt to different specifications of the workpiece processing requirements, the outer wall of the steel tube cleaning disposable derusting grade reaches Sa2.5 - Sa3, changed the traditional primitive blasting process, with a high degree of automation, energy saving and environmental protection, the safe operation of the advantages, greatly improves the cleaning work efficiency, leading in the peer level, has been completed a large number of network engineering production, still play an irreplaceable important role.In the latest technological transformation, we on the original rotary blow back type dust removing system transformation, instead of the simple and practical space occupancy, low bag dust collector, water tank filter to form replaced stack emission.Compared with the common cartridge type dust collector, reducing the investment and running cost, through calculation and ensure the filtering area, to meet air processing requirements, simplifying the electrical control system, the operation is more convenient.The new steel structure assembly workshop the equipment moves recombination, unified classified management, make the equipment efficiency gets more sufficient play.

2 plate blasting cleaning

Steel shot blasting machine is the processing plate size requirements, design of different specifications, polishing head number of special steel plate processing equipment, which is characterized in the chamber body below the projection angle radiation surface design.With the business development, we relate more elevated bridges and other special-shaped structure processing, steel making greater use of steel plate pretreatment processing mode, if the general steel shot blasting machine processing, needs to produce a special bracket, the two loading and unloading turnover, heavy work efficiency is low, and the electricity consumption.Special steel shot blasting machine, Menfu to 3 meters, suitable for most sheet metal processing capacity range.Loading and unloading the input output table, disposable easily complete the steel shot blasting, the output end set pill blowing device, the timeliness of clean steel.Consider the development of future needs, the equipment can be upgraded to include a full set of Shotblast derusting, painting, drying, waste gas filter system of steel pretreatment line, to save space, simplify the operation process, eliminate ground paint pollution factors, Shotblast derusting spray paint finish, shortening after rust removal of steel oxidation time, effectively compensate for artificial processing efficiency deficiency.

3 steel blasting cleaning

Steel shot blasting machine is designed and developed according to the shape of the workpiece dimensions of different specifications, polishing head number of shot blasting equipment, which is characterized in the chamber body to different setting angle parabolic head, this equipment technology is already very mature.The shot blasting machine can also process the smaller size of the workpiece, mass production can make the special bracket, so that the workpiece can be placed in the projection angle radiation range reasonable position, operation open only need polishing head, effectively reduce the vulnerability of loss and electricity consumption.For some time structure and small pieces of generic profiles processing, we equipped with a non-standard pieces of shot-blasting machine, the roller of each set of 2 parabolic head, equipment structure and steel plate machine can complete the same principle, processing, without the two turn and shot blasting, avoid unnecessary consumption.Because of the huge equipment structure, equipment below ground foundation must be waterproof, prevent future equipment in the long-term use of water seepage, unnecessary trouble.Because of the high rate of equipment utilization, the frequent replacement of wearing parts, energy consumption, use improper operation cost increase, even appearing polishing head transmission bearing damage, damage of motor, Gangwan breakdown equipment enclosures and the like, must cause enough take seriously, prevent equipment failure becomes a bottleneck in production process.The new steel structure installation

Four software analysis of the same light rigid frame structure

      Often hear the saying: "a certain software than a certain software province the amount of steel, of course, who say such things are generally not of our professional people, at most, is a little knowledge, however, as a true professional design staff know about the specific component design process how much? There are a large number of software users in the design of steel structures industry, therefore, as preparation software in the design field, it is necessary to do some things: different software on the same conditions as the same below a engineering calculations to see the results in the end there is much of a difference.
      The selected areas of light steel structure, because this is the use of the most extensive and the most sensitive to the amount of steel structures, I just did a software, so often heard the most about light the issue of the amount of steel in steel.
      Popular software are the industry today, they the: 3D3S, STS, PS2000 also Maggie_GJ.
I. Project Introduction
      Selected works as follows:
      Two spans 27m, hipped slope of 1/20, cornices elevation 7.5m column spacing 9m material Q235. Diagram is shown below, as indicated by a clear cross-section beams and columns specifications (beam marked only the left cross, right symmetrically), member ID inside the circle, the segment size of the beam member also made a mark.
      Load:
      Roof dead load: 0.2 KN/m2
      Roof live load: 0.3 KN/m2
      Basic snow load: 0.45 KN/m2
      Basic wind pressure: 0.45 KN/m2
      Not consider earthquakes.
Second, analysis of results
      In order to get accurate conclusions, we do not use the software to optimize the function of the components, but simply checking the member section given here give only the number calculated by the software components control stress.
Consider a factor of 0.6 (knee bracing effect), control the stress of the stability of the stress in the plane, in brackets the value of the stability of the stress in the plane.
      In column (8 members), stress control plane stability stress For the purposes of this case, because of the live load is evenly distributed, and the structure symmetry, the column axis force, so the cross-section according to the calculation is relatively small, but the actual situation Due consideration should be given to the uneven distribution of the load, where the calculation result is not considered, the brackets for the stability of the stress in the plane value.
      For oblique beam (2-7 member), the the gantry frame light house steel structure technical regulations (CECS 102: 2002) provides that calculation of its intensity in the plane before computing its stable plane bending member, but 3D3S and STS gives stability plane stress, but also control stress. "Portal frame light housing steel structure technical regulations" (CECS 102: 98), he says that the calculation of the length of the vertical support point spacing oblique beam plane, this was removed in subsequent procedures . If the plane stable calculated as a bending member, the inclined beams should be a bent components, and the axial pressure along the rod axis direction or the horizontal direction to consider it? There is stability factor is calculated according to this calculation length is the point? So like the column as a bending member as to calculate the plane's stability is a bit far-fetched. Calculated stability outside the plane is actually calculated the overall stability of the flexural members, but also to take into account the axial force. But still beam characteristics. Maggie not calculated the stable stress within the so-called plane.
Third, extraneous words
      Control stress table view from above, basically very close, just PS2000 slightly higher, this may be my version earlier. Therefore, we can say that the key to the so-called savings in the amount of steel is not software, but the use of the software, the software is only a tool, like a calculator. That kind of hope that the little people do not know the component design process can be easily completed ideal structural design software, even if there is, it is also a potential bomb. It generated construction drawings, you can fool the layman's owners also make professional knowledge you Dousheng unlimited expansion of self-confidence, steel structure design and feel much better than this.
      Real structural engineers have the skills of mechanics, approximate the stress state in a variety of boundary conditions have a certain feeling for the structure under a load, especially flat-structure system for complex spatial structure system With the help of structural analysis software to understand the stress condition. Second, we need to have the theoretical basis of the component design axial compression member of Compression Members need to consider in terms of steel structures, should be clearly understood. Also need to master the common node connection and the calculation method, some experience issues involved here. Also need to know, but outside of the design fabrication and installation knowledge, because a lot of these issues need to be considered during the design phase. Of course, the most important thing as the sense of responsibility of the structural engineer.

Steel sheeting is widely used because of its light weight, high strength,

beautiful appearance, convenient installation, etc., abroad not only hand industrial plants, and many civil construction, building envelope to do with it, such as roof and wall panels.

The so-called skin effect refers to the pressure plate in its plane shear capacity, may be called by diaphragm action. Such as steel sheeting and components for a reliable connection, this skin effect of the building envelope can also become an important part of the structure, the entire structural system, connected with compression, bending pressure component provides continuous side to support, and thus improve the bearing capacity of the rigidity and stability of these components. The design specifications of the United States to introduce the method of the blindfolded supporting design. Our "cold-formed steel structural design specifications by force skins are under development.

At present, China's steel industry, there are still many problems, including:

The steel industry is in line with energy saving and environmentally friendly, sustainable development of industry awareness has to be raised. In recent years, Japan, Canada, the United Kingdom government and research institutions published a lot of articles devoted to the development of the steel structure housing the advantages and measures used for reference.

2 design concepts can not meet the needs of the market. The super high-rise buildings and special requirements mostly by foreign architects program successful, indeed unique in their planning, environmental, architectural and functional. Connection node is too complex, consume too much steel and bring more problems to the production and installation, but also increases the cost of the project.

3 parts of steel structure enterprises blindly launched, the herd instinct, leading to overcapacity and waste a lot of resources.

Market run is not standardized, the bidding companies compete to lower prices and steel prices, caused the loss of processing and installation enterprises.

Steel research and development funds, standards and specifications revision cycle is too long; standard and application-specific procedures missing items, lag; steel standards and engineering design, construction specifications, procedures convergence is not on.

6 steel structure processing plants and the construction and installation of business equipment, computer management, labor productivity need to be further improved.

7 steel structure professional and technical personnel, the lack of skilled workers, especially in the SMEs shortages, technical quality and management do not adapt to the needs of production.

8 of the role and function of the industry associations are far from being in place. Particularly in the specification and to guide the market order, service enterprises, develop the steel market, the standard preparation of amendments and the training of professionals, has yet to be perfected.

The next period of time, the steel structure in several areas of China will increase, will also speed up the construction of thermal power plants, the main plant and the the boiler steel frame the amount of steel plant steel (including nuclear power plants will increase wind power generation steel, etc.); bridge traffic engineering will increase use of steel railway bridges, roads and bridges in recent years the use of steel into the development trend, the Beijing-Shanghai high-speed, across the sea, cross-river bridge with steel bridge, highway guardrail, toll station, the amount of the steel structure of the traffic signs are also many. There are airports, train stations, new and expansion; municipal building in the amount of steel structures will increase subway and light rail projects, urban overpasses, viaducts, environmental engineering, urban public facilities and temporary housing and so more and more use steel structure. Especially in Beijing, Shanghai, Tianjin, Chongqing, and the major capital cities, medium-sized cities in economically developed, steel consumption will be significantly increased.

Such as Beijing for viaduct steel over 20,000 tons annually. Beijing Olympic Games, Shanghai World Expo, the Asian Games in Guangzhou and Shenzhen World Youth Council supporting facilities with a large number of steel building; steel structure housing a substantial increase. The state advocates the construction of land-efficient residential, the steel residential design specification and supporting technology, basic materials have. At present, China only several million square meters of residential steel developed countries has reached 40% to 50%. China's annual completion of 600 million m2 of urban residential construction 5% is made from steel, multi-layer, high-rise buildings per square meter on average 50kg steel design, the amount of steel will reach 1.5 million tons per year. The figures have not been rural buildings with steel structures included in the statistics; China's steel prices lower than international prices, low labor costs, good quality steel production, strong competitiveness in the international construction market, foreign enterprises in the past few years procurement of steel structure in China has increased, and the many Steel Factory also undertake overseas orders. (End)