Attaching the a-frames to the center collar, Chapter 7: roof assembly – Grain Systems Tanks PNEG-4072G User Manual
Page 97
• Use evenly distributed connection points of support when lifting.
• Before attempting a lift, adjust each lifting cable to achieve the appropriate angle needed (approxi-
mately 30 degrees).
• Assemble the A-frames with X-bracing last, so that they can be easily accessed to be lifted into place
first.
Table 7-3 For Gamma roof
Bin Diameter
Peak Capacity
Ground Snow Load
Approximate A-Frame
Weight
72 ft. (21.95 m)
50 K
50 PSF
999 lb (453 kg)
The part variance multiplier is 4%.
Attaching the A-Frames to the Center Collar
The A-frame rafters must be installed to support the center collar and main roof structure.
Before You Begin
The center collar should be assembled and secured to the support pole, and the A-frame rafters should be
assembled. Determine the correct location of each A-frame. For more information, see
. Read and understand the safe and proper lifting procedures needed to install the A-
frames. For more information, see
Guidelines for Assembling and Lifting the A-Frame Rafter Sections,
.
1. Carefully lift the A-frame assembly (A) into position, and align with the proper holes on the center
collar (B).
2. Install flange bolts (C) and flange nuts (D) as shown.
3. Before continuing with the remaining A-frame rafters, secure the A-frame rafter to the eave clip. See
Attaching the A-Frame to the Eave Bracket , page 98
Pneg-4072G 72 Ft Diameter 40-Series Bin
97