A Brief Discussion on the Classification of Scaffolding
Divided by the material of the rod
1) Scaffolding with a single specification steel pipe. It only uses one specification of steel pipe, such as the clip type steel pipe scaffold, which only uses welded steel pipes with a diameter of 48 × 3.5.
2) Scaffolding with a combination of steel pipes of various specifications. It is composed of two or more different specifications of steel pipes, such as a portal scaffold.
3) Scaffolding mainly made of steel pipes. Scaffolding mainly composed of steel pipes, supplemented by other types of steel members, such as inner scaffolding with channel steel supports or bases, and cantilever scaffolding with connected steel plates. When using steel pipe crossbars, the bowl buckle type steel pipe scaffold is a "single steel pipe scaffold"; When using steel profiles to build edge crossbars, it is referred to as a "scaffold mainly made of steel pipes".
Divided by the way vertical force is transmitted between horizontal and vertical bars
1) Transmitting force through friction on the contact surface. The load on the crossbar is supported and transmitted to the upright by the frictional reaction force generated by the contact surface at the node after compression, such as the effect of fasteners, which generates frictional force through the positive pressure of tightening bolts;
2) Transmitting force through welding seams. Most of the plug-in connections between horizontal bars and vertical bars use this method, and the gantry also belongs to this method;
3) Direct pressure transmission. This method is more common in scaffolding where horizontal bars are placed at the top of vertical bars;
4) Relying on the pin to resist shear force transmission. The vertical connecting plate through which the pin passes through the horizontal bar and the hole in the vertical bar are used to achieve connection, and the pin is subjected to shear force on both sides. This method is not commonly used in the connection of horizontal and vertical bars.
In addition, there are three ways of force transmission in the connection between poles:
1) The force transmission of the socket joint support. The upper and lower upright poles are connected, using connecting rods or socket tubes to ensure a good state of connection;
2) The shear transmission force of the pin rod connected by the pin rod;
3) The meshing force transmission of screw connections. The external thread of the inner tube meshes with the internal thread of the outer (sleeve) tube to transmit force. The latter two methods of force transmission are often used in pole connections that require height adjustment.
Divided by the fixing method and installation position of the connecting components
1) Fixed distance connection: that is, the fixed distance setting of the welding piece on the rod, the fixed length of the rod, and the fixed spacing of the connection points;
2) Non fixed distance connection: that is, the connecting piece is a single component that can be clamped on any part of the rod by tightening the bolt.
Divided by the fixed node operation method of workers
1) Insert and tighten;
2) Tighten the bolts
