SR 141 – I 676 677 Tiebacks

New overpass bridges crossing over I-95 were under construction. During the excavation for the abutments, tiebacks were required to assist with the support of excavation. Eighteen helical anchors tiebacks were installed and successfully load tested.

Project Summary:

  • Helical Pile Type: 5 1/2″ .361 (3-Bolt) RS Ideal
  • # of Helical Piles: 18
  • Location: New Castle, DE
  • Installation Depth: 35′-40′
  • Ultimate Pile Capacity: 60 to 204 KIPS in Tension
  • Equipment Used: Kobelco Excavator, DIGGA SD 95 Drive Head, Marian Torque Indicator
  • Challenge/Unique Aspect: Custom tension adapters were specially fabricated by IDEAL with a square end to accommidate the adapters behind the sheeting wall. Tieback loads ranged from 60 to 204 KIPS in tension.
  • General Contractor: R.E. Pierson Construction Co
  • Audubon Environmental & Helical Piers