The complexity of construction quality problem of steel structure project is mainly manifested in many factors that cause quality problems, and the reasons for quality problems are complicated. Even the quality problems of the same nature are sometimes different, so the quality problems are analyzed and judged. And processing ads complexity. Such as welding cracks, which can occur in the weld metal can also occur in the base metal heat effects, both in the weld surface, but also within the weld; crack parallel to the bead can also be vertical In the weld, the crack may be cold cracks, it may be hot cracks; causes of improper selection of welding materials and welding preheating or post-heat improper points.
(B) The severity
The seriousness of the construction quality of the Steel Spac Frame For Hangar Online project is manifested in the following aspects: Generally, it affects the smooth progress of the construction, resulting in the delay of the construction period, the increase of the cost, serious collapse of the building, resulting in personal injury and property damage.
Steel construction quality problems will also change with the outside world and the time to continue to develop and change, quality defects gradually. For example, the welds of steel members due to stress changes, so that no cracks in the original weld cracks: the weld after the weld in the role of the activities of hydrogen can produce delayed cracks. Another example is the long-term load-bearing components, the steel components to produce under the arch bending deformation, resulting in hidden dangers.
As China’s modern buildings are mainly in the concrete structure, engaged in construction management and technical staff of the steel structure of the production and construction technology is relatively unfamiliar to the main workers of the specific construction workers do not understand the scientific construction of steel structures Methods, resulting in the construction process of accidents often occur.
Steel Spac Frame For Hangar Online must pay attention to protection, especially thin-walled components, therefore, in a strong corrosive medium within the building should not use steel structure. Steel structure should be thoroughly rusted before painting, paint quality and coating thickness should meet the relevant specification requirements. In the design should avoid the structure of moisture, leakage, the structure should be avoided in the inspection and maintenance of dead ends. New construction of the steel structure generally have to re-brush at a certain time coating, maintenance costs higher. At home and abroad are developing a variety of high-performance coatings and weathering steel is not easy to rust, corrosion resistance of steel poor problem is expected to be resolved.
Steel is not fire
Temperature of more than 250 ℃ or less, the material changes, not only the intensity gradually reduced, but also the occurrence of blue brittle and creep phenomenon. Temperature of 600 ℃, the steel into the plastic state cannot continue to carry.
Fracture of steel structure
Steel structure at low temperatures and under certain conditions, may occur brittle fracture, as well as thick layer of lamellar tear, and should cause the designer’s special attention.
More expensive steel
After the use of steel structure will slightly increase the cost of construction, often affecting the choice of owners. In fact, the cost of the upper structure of the total investment in the proportion of small projects, an increase of about 10%. The high-rise buildings, for example, an increase of less than 2%. Clearly, a single factor in the cost of the structure should not be used as a basis for deciding which material to use. If a comprehensive consideration of various factors, especially the duration advantage, the Steel Spac Frame For Hangar Online will be an increasing attention.