The advantages and disadvantages of building steel plant?
Time：[2014-7-26] Hits：5262
Advantages and disadvantages of steel construction plant?
Foshan Steel Advantages
1, widely use: apply to factories, warehouses, office buildings, stadiums, hangars and more. Both for single-large-span construction, can also be used to create a multi-or high-rise construction.
2, the construction of simple, short construction period: All components are prefabricated in the factory is completed, simply assembled on site, thus greatly shorten the construction period, a 6,000 square meters of construction materials, just 40 days to complete the basic unit.
3, durable, easy to maintain: General Computer designed steel construction can resist harsh weather, and simply maintenance.
4, beautiful helpful: Steel construction clean lines and smooth, with a modern feel. Colored wall panels have a variety of colors to choose from, other materials may also be wall, and therefore more flexible.
5, the cost is reasonable: steel construction, light weight, reduce the cost base to create fast, can be put into operation as soon as possible, much better than the overall economic efficiency of the construction of concrete structures.
Shortcoming
An analysis of the quality of Foshan Steel Works attack doubt
Steel is difficult to guarantee the quality of the project for many reasons, but also very complex, both technologies resulting in improper questions, there are also questions about the formation of violation of technical operations, as well as a sense of responsibility because of technical standards and construction workers to form questions, as well as decision-makers quality doubt mistakes formation.
(A) doubt their existence steel
A unit of a building in the processing box columns 1200 * 1200 * 60 in the welding process appeared as suddenly found 60mm thick web of tear appearance, clearly visible crack the board, from the thickness direction of the two bonus half the depth of the crack by NDT inspection found at a depth of about 3mm attack, while another of the same type from the same batch of plates cut a few parts, it was discovered in the mezzanine board memory, rolling doubt the quality of poor quality is the main form the reason. Because the welding process of welding the welding stress episodes opened the sandwich material. Thus there tearing in the thickness direction of the plate appearance.
Analysis: Because of the use of particular parts of the web as in the component parts used in the longitudinal direction of the upper and lower parts of welding in the welding formal opening of full penetration groove force of stiffeners, because the existence of an internal board layered, welding welding stress episodes released thus torn out sheet in the thickness direction.
Can take the following measures to deal with several of the actual situation:
(1), mezzanine exist within a large steel mills belonging to the onset of their quality in the process of rolling doubt, has gone beyond the requirements of national standard specification can send requests to verify mills, steel mills in consultation with the return or exchange cargo handling;
(2) If the number is less sandwich technology sector and the owners can seek advice, information feedback to the steel mills, the construction of the emergence of doubt take remedial measures, according to the results of non-destructive inspection in doubt, the site uses gouging All dig beyond their depth with equal strength and weld filler material, the outer end of the treatment, after a predetermined time for NDT inspection, while the samples for the same members, physical testing, design specifications can reach continue to use;
(3), under the supervision of the parts cut off the witness again to meet the conditions put on the plate, replaced parts for non-load-bearing and non-critical parts or as an auxiliary use, after the prescribed time after the completion of perform NDT inspection, make a record.
(B) appear in the construction process in doubt
Manufacture process easier to attack the quality of questions and deal with it very difficult after the onset of the main processes and is particularly important process. General questions about the quality of processes episodes proportion is small. During the construction process of the above, in particular processes have welding, painting, an important step has cutting and installation.
1, the welding process. The processes are hidden works, one of the most easy to attack the quality of processes in question, from 2004 to a company's product quality report statistics show that the onset of the quality of questions in the process: because, as the quality of welding seam resulting in failure rates as high as 80 % or more, followed by questions about the procedure because of technical and operational personnel improper operation, which results in about 10% of weld quality questions, such questions are the main questions directly impacts the quality, quantity, so this type of questions must be professional check the companies use specialized tools to be able to check to check, judge it, generally based on the type of weld defects into the slag, not fusion, such as porosity.
2, the coating process. The process also belongs hidden processes, the impact of construction on the structure function is less than. Quality is also easier to attack questionable processes. The main questions about the quality of process table now: exterior paint large drop and local components falling, falling film component appearance, seizures sagging appearance, insufficient film thickness, film thickness spread unevenly, film color color large.
3, lofting cutting processes. Before this process belongs to the leading members before processing, the quality is good or bad for the next process there is a direct impact, and even cause the entire cutting scrap parts, episodes of this situation is very common, so the next feeding for strengthening the process of quality control is very important and necessary. The onset of the quality process now doubt the main table: For long and thin type of cut parts in the deformation ratio than ferocious; since cut gas or plates inside presence and composition of the slag, which results in the spread unevenly cut surface appears horse teeth pattern, nodules, deep cut marks over norms; gas cutting or sawing parts shrink and does not consider the follow-up process, the shape and size of components resulting in excessive; because of mistakes in the preparation of technical documents, which results in zero bulk parts scrapped; cutting the size of the cut beyond the grave specification requirements.
4, the installation process. The quality component machining process occupies an important position in its quality greatly influenced by the procedure, so before installing strengthen the monitoring process is very important. The process of attack, the main questions about the quality of the table now: orientation of fault parts installed, such as pretending to 3450mm 4350mm; components using fault, should have been installed 2 # components parts, installation is another part # 3; zero component mounting fault in the correct orientation, such as holes originally outwardly board 45mm, 45mm and the actual contents of the South; void mounted components installed beyond technical specifications and documentation requirements, 3mm gap, 7mm; some zero components are not installed by correcting it, after the installation is complete distortion exists no way to eliminate distortion; operatives privately easy way to cut a hole the size of overweight position on the part; assembly and welding area is not a table, surface treatment; since the paper size fault installation fault formation.
(C) the use of questions
Because the steel plant does not regulate the use of foam, some manufacturers in order to save costs, with the lowest non-flame-retardant materials as fillers, resulting in a fire steel plant personnel can easily attack caused casualties.
