2012年12月24日星期一

The China steel structure components production of steel and steel castings varieties, specifications, performance


Quality of imported steel products should meet the requirements of the standards of design and contract provisions. Variety of welding materials, specifications, and performance should be consistent with the current national standards and design requirements. Steel connection connected with high strength large hexagon head bolts Vice torsional shear type high strength bolts connecting Vice steel grid with a high-strength bolts, common bolts, rivets, self-tapping screws, pop rivets, Nailing, riveting bolt (mechanical type and the formula dosage forms), foot riveting bolt fastening standard parts and nuts, washers and other standard accessories, varieties, specifications, performance should be consistent with the current national standards and design requirements. High strength large hexagon head bolts connection deputy China steel structure and torsional shear type high strength bolts connecting the factory should be, respectively, with the box with torque coefficient and fastening axial force (pre-tension) inspection reports.

The welders must, pass an examination and obtain a certificate of competency. The permittee the welder must in passing the examination of the project and its scope of accreditation welding. Design requirements for full penetration of the two weld ultrasonic inspection for internal defects inspection, ultrasonic inspection can not make judgments on the defects, should be used ray detection the internal defect classification and testing methods should be consistent with the current national standard "ultrasonic testing of steel weld by hand methods and classification of testing results Act "GB1135" steel melt welded butt joints radiographic inspection and classification of "GB3323 requirement.

Steel columns, steel girder webs material should pay attention to the cross-sectional dimensions of change, allowance should be left at both ends the beam weld using automatic submerged arc welding, welding sequence according to the welding process requirements of the order. Hole, all connecting plate, gusset plate must be paired drilling hole on accuracy should meet the specification requirements. The anticorrosion coating: shot blasting reach ST2 level. The surface of the component should not China steel structure mistaken coated friction connection (especially face), drain coating, the coating should not be peeling back to rust. The coating should be uniform, no obvious creasing flow fall, such as pinholes and bubbles. Steel structure components factory inspection and No. No. generally marked the axis of the column number, overweight super long the components sometimes also marked the position of the center of gravity of the weight and lifting. The difference of the light steel and heavy steel truss steel structure construction process

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


http://structureworkshop.blogspot.com/2012/12/china-steel-structure-altitude-assembly.html

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