A, scaffolding material and specifications
(1) the material of steel pipe and specifications

Generally adopt appropriate GBT00 ordinary carbon structural technical conditions of technical requirements of A3 steel, flat and smooth appearance, no crack, delamination, distorted, make hole section and is less than 0.5 mm steel pipe corrosion degree, must have the manufacturer's quality certificate or rental unit quality assurance certificate.

All fasteners shall be preferred 48 mm outside diameter, wall thickness 3-3.5 mm of welded steel pipe used for stud, the ledger and diagonal length of steel tube with 4-4.5 m advisable for small bar steel pipe length is 2.1 2.3 m.

(2) the material of fasteners and specifications
Fastener is specially for the bar to steel pipe scaffold for connection, it has to turn right (cross) and docking (a word) three forms, fasteners should be malleable cast iron, its technical requirements shall be met GB15831 "steel pipe scaffold fastener" regulation, it is forbidden to use deformation, crack, oil silk, sand holes and other ills of fasteners are not allowed to sustain tension along axis direction; The right-angle fastener forbid along the cross axis under torsion;

Docking fastener is unfavorable and sustain tension, when used in vertical nodes, the only allowed under pressure, fastener bolt tightening torque should be controlled between 40 to 50 nm, using the right Angle and rotary fasteners, fastening, steel pipe end, should extend fastener cover plate edge, no less than 100 mm, the fastener grip the pole, the opening minimum distance not less than 5 mm, rotating fastener clearance at both ends of the rotating surface needs to be less than 1 mm.