S e c t i o n 1 3 - P a g e 4 May 2013 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 – " 8" sections – 5 / 8 " 10" sections – " 12" sections – 1" • Bolt size (A325) and quantity: 4" sections: (2) " dia 5" and 6" sections: (2) 1" dia 8" and 10" sections: (4) 1" dia 12" sections: (6) 1" dia The above ar e for normal loading conditions. For extr eme conditions, a full-moment str ength joint may be r equir ed. Foot Plate • 4 " sections: " x 7" x 7" • 5 " sections: 5 / 8 " x 9" x 9" • 6 " sections: 5 / 8 " x 9" x 9" • 8 " sections: " x 12" x 12" • 10 " sections: 1" x 14" x 14" • 12 " sections: 1" x 16" x 16" Tie Rods • A529 ro d stock with 4 " N.C. thr ead each end • Length=rib spacing 6 " • With 4 " and 6" sections: " dia. • With 8 " and 10" sections: " dia. • With 12" and above: structural spr eaders a re r ecommended Pipe Spacers • Schedule 40 pipe stock • Length=rib spacing – web thickness • With " dia. Tie r ods: 2" dia. • With " dia. Tie r ods: 2" dia. www .dsiundergr ound.com