Embodied in the steel production process

1, Steel plant units with no installation process, install components without order. If a hall, a building area of ​​6,000 square meters, a total of 4 layers. The members have all been installed to the ceiling, but the main steel columns are still not fixed welding small steel columns of the edge of the auxiliary have all welding finished. In another example, the steel columns installed as soon as possible the steel columns at the bottom of the pad pad flat weld it, then dense with fine stone. But some site color plate has begun to install the column foot has not closed.
Mishandling installation of the steel columns, like a candle, a root single plug up the day they can not form a solid framework unit, windy way, resulting in the collapse. Such security incidents occur several times, and should definitely be avoided.
3 anchor bolts uneven, the column feet plane without the prior measurement, embedded dislodged a column deviation, should be measured buried.
4 field welds generally not in place. Rigid connection pad welding gap is too small, not penetration results pad hand to pull it off; liner plate specifications do not meet the requirements, or even replaced with steel; the bad weld forming, rugged, and varies in width spatter, weld flash is not clear, bite the meat more stomata; the arc head arc tail without lead arc quenching board dishing and so on.
Steel company to install high-strength bolts, some more: Luya, even lower than the nut; bolts not tightened SHEAR Plum head not wring, the large hexagon no early wring final screw marked ; install the friction surface of the protective paper is not torn; high-strength bolts for temporary fixing, not lacquer sealed 48 hours after installation; without making torque and axial force re-examination, the tightening torque is calculated according to the specified; the friction coefficient trial is not in place, Some do, some do only one group. Rod bolts are not tightened, Rod is not straight, waist round hole is not big washers, caused by the nut base metal contact surface is too small, easily perforated.
 6 drawings reviewing carefully, resulting in the installation of quality defects. Such as design drawings did not indicate that drilling in the crane beam wing board, the construction unit has not argued, results welded mounting rails, causing the crane beam deflection. Violation of the mandatory provisions relating to crane beam does not allow flexible provisions.
7 the envelope color plate patchwork of tight close adverse side the nostrils "not plugging the impact against leakage of rainwater and beautiful. This article comes from the steel structure engineering network