ing or folder installation. Welding fixed for the permanent position does not require demolition, such as equipment around the platform; and with the use of the installation folder does not undermine the zinc layer and the demolition of the characteristics of convenience.
Welding is fixed: usually at a flat 2 flat steel welding, weld length of not less than 20mm, not less than the high welding 3mm, the use of plane angle weld; if the grating or the span of particularly large particularly when th