Accessories Used with Ribs

Butt Joint

• Butt plate height: Rib Depth plus 1"
• Width: Flange width plus 1"
• Thickness: 4" and 5” sections – ³/₈"
       6" sections – ¹/₂"
       8" sections – ⁵/₈"
       10” sections – ³/₄"
       12" sections – 1"
• Bolt size (A325) and quantity:
       4" sections: (2) ³/₄" dia
       5" and 6" sections: (2) 1" dia
       8" and 10" sections: (4) 1" dia
       12" sections: (6) 1" dia

The above are for normal loading conditions. For extreme conditions, a full-moment strength joint may be required. 

Foot Plate

• 4” sections: ¹/₂" x 7" x 7"
• 5” sections: ⁵/₈" x 9" x 9"
• 6” sections: ⁵/₈" x 9" x 9"
• 8” sections: ³/₄" x 12" x 12"
• 10” sections: 1" x 14" x 14"
• 12” sections: 1-¹/₄" x 16" x 16" 

Tie Rods

• A529 rod stock with 4" N.C. thread each end
• Length=rib spacing + 6"
• With 4" and 6" sections: ³/₄" dia.
• With 8" and 10" sections: ³/₄" dia.
• With 12" and above: structural spreaders are recommended
 

Pipe Spacers 

• Schedule 40 pipe stock
• Length=rib spacing – web thickness
• With ³/₄" dia. Tie rods: 2" dia.
• With ³/₄" dia. Tie rods: 2" dia.