The transverse flat tubes which are not at the main joints on the working platform shall be better to be set at equal space according to 

need of the supporting scaffolding and the maximum space shall be no bigger than half the space of longitudinal space.

When using the pressed steel scaffolding, wood scaffolding and bamboo scaffolding, the two ends of the transverse flat tubes on the double lined scaffolding shall use right angle couplers to fix on the longitudinal flat tube; for the single line scaffolding, its one end shall be fixed with right angle scaffolding coupler to the longitudinal flat tubes and the other end into the wall and the inserting length into the walls hall be no smaller than 180mm.

The main joints shall be set with a horizontal flat tube and fixed with scaffolding double clamp. All of them shall not be removed during the construction period.

All the single line scaffolding shall be fastened and fixed into the wall at one end also with a length of no smaller than 180mm.