Light Steel Plant Roof Purline System

Light steel plant system - roof, purline

Structure of the roof frame: the structure of the roof depends on the use of the roof materials and the use of the house.The main structure is triangular roof, triangular arch roof and fusiform roof trapezoidal steel roof frame

Light steel roof truss with ordinary steel roof truss has no much difference in essence, the design method of the principle is the same, just cross section size is small, light steel roof truss bar connection structure and conditions of use is slightly different

Trapezoidal roof articulated support node:

Purlin:

Purline forms: the purline should be given priority to the use of real abdominal components, or an empty abdominal or lattice structure.Purline is generally a single span simple support component, and the real abdominal purline is a continuous member.

Hollow type purlin, hollow type purlin by the Angle of the upper and lower chord and batten plate welding, its main characteristic is to use less steel, small Angle steel and steel sheet, can be reasonably used for batten plate spacing is dense, assembling and welding of the workload is bigger, so the application is less.

Lattice type purline: lattice purline can be used in plane truss, space truss type and bottom supporting purline.

The purline is arranged and shelved on the roof (frame)

1. For the bending moment of the upper chord of the roof, the purline should be located at the upper chord of the roof.When using inner gutter, purlin should be as close as possible to the gutter.

2. The sections of the real abdominal purline shall be perpendicular to the roof slope.For channel steel and z-shaped steel bars, the upper limb tip (or roll) should be pointed toward the ridge direction to reduce the torque caused by the eccentric load on the roof.

3. The upper chord of the truss purline shall be perpendicular to the upper chord of the roof, while the bowstring and the lower chord shall be perpendicular to the ground.

4. Spinal purlin scheme: the real abdominal purline should be double-purlin scheme, and the ridge purline can be connected with channel steel, Angle steel or round steel (see below).The truss purline adopts single purlin scheme at the roof of the roof. Although the steel amount is more than the province, the purline model increases and the structure is complicated, so it is advisable to use double pu sandwich panel.