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Purlins are horizontal structural members used in building structures to support roof covering materials.
Bolt ball node refers to the node by high-strength bolts, steel ball, fastening screws, sleeves and cone head or sealing plate and other parts of the group.
In the specific construction process should be for different weldments and their weld thickness requirements to control the size of the steel pipe material, which requires the same specifications of the rod first to produce "sample rod", so as to achieve the purpose of correcting the size of the material.
used as a template in the construction stage, can replace the force reinforcement in the normal stage, such as the load is larger then need to install additional force reinforcement; fire situation, need to configure fire-resistant reinforcement.
The vertical rib (web) plate is perpendicular to the transverse plate, and the two adjacent vertical ribs are mechanically occluded together by the compression steel plate roofing panels.
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