Shelf tube refers to the construction site for the workers to operate and solve vertical and horizontal transport and the erection of various brackets. The general term in the construction world refers to a place on a construction site that is not directly constructed using an outer wall, interior decoration or a high layer. Mainly for the construction personnel up and down work or the perimeter safety net maintenance and High-altitude installation components, and so on, plainly is Shing, scaffold production materials are usually: bamboo, wood, steel pipe or synthetic materials.
Some projects also use scaffolding as a template, in addition to advertising, municipal, traffic, bridge, mining and other departments are widely used.
Classification of steel tube shelves Domestic steel pipe material made of scaffold has fastener-type steel pipe scaffolding, bowl buckle steel pipe scaffolding, socket-type steel pipe scaffolding, door-type scaffolding, as well as a wide range of scaffolding, hanging scaffold and other steel pipe material scaffolding.
Proceed from its material and structure, and can be roughly divided as follows:
1, according to the material division of the bar 1) Single gauge steel tube rack tube.
It uses only one standard steel pipe, such as a fastener-type steel tube scaffold, using only ф48x3.5 welded steel tubes. 2 a variety of specifications of steel tube combination of the shelf tube.
It is composed of more than two kinds of steel tubes of different sizes, such as portal scaffolding. 3 Pipe-oriented tube.
That is, the steel pipe, supplemented by other steel bar components of the scaffolding, such as with a groove steel jacking or base of the scaffold, there are connecting steel plate of the scaffold.
When the steel pipe bar is adopted, the steel pipe scaffold is a "single steel pipe Scaffold" When the steel bar is used as a "steel pipe scaffolding".
2, according to the cross bar and vertical force between the transfer of the way divided 1) by the contact surface friction effect transfer force.
That is, the friction force behind the contact surface of the joint is used to support the transverse load and pass it to the vertical bar, such as the function of the fastener, and the friction is generated by tightening the positive pressure of the bolt; 2) by the Weld force.
This is the way in which most of the rails and the vertical poles are inserted, and the door frame is the same; 3) Direct pressure transfer force.
This method is commonly seen in the bar at the top of the scaffolding; 4) by the pin-beam shear force. That is, the vertical connecting plate through the bar and the hole of the upright bar are used to realize the connection and the two sides of the pin rod are subjected to shearing force.
This method is rare in the connection between the bar and the pole.
In addition, there are 3 kinds of force transfer modes in the connection between the vertical bar and the vertical bar: 1) The support transfer force of socket docking.
That is, the upper and lower vertical bar docking, the use of connecting rods or intubation to ensure the good state of docking;
2 Shearing force of pin rod connection; 3) The meshing force of the screw buckle connection. The internal thread of the inner tube and the outer (sleeve) pipe are engaged in the transmission force.
The latter two kinds of force-transfer methods are used to adjust the height of the vertical bar connection.
3, according to the connecting parts of the fixed way and installation location Division
1 Fixed distance connection: that is, the fixed distance of the welding parts on the rod, the length of the bar is set, the junction spacing is stereotyped;
2 Indefinite distance connection: that is, the connecting part is a single set piece, by tightening the bolt can be clamped on any part of the rod.
4, according to the working method of fixed node of workers Division
1 Insert important tube; 2 Tighten the bolt rack tube.