UFC 4-150-07
19 June 2001
SR-8: REINFORCING TIE-BACK SYSTEMS FOR STEEL SHEET PILE WALL
Problem: Light to moderate movement of the top of the steel sheet pile wall has
occurred due to tieback failure or excessive loading behind the wall. The area
behind the wall is accessible to perform repairs.
Description of Repairs: Install a new wale slightly above the existing wale.
Locate the new deadman anchors based on engineering calculations. Trench for
the tie rods between the wall and the deadman anchors. Place the tie rods
through the wale and sheet piles and secure in place to the deadman anchors
(see Figure 8-8). Be sure that enough clearance is allowed through the sheet
piles to electrically isolate the tie rods from the piling.
Install zinc or magnesium packaged anodes to prevent future corrosion of the
rods.
Replacing an existing tieback system may involve the replacing any or all of the
existing components, depending on the amount of deterioration that has taken
place.
Sheet pile wall movement can also be arrested by changing the soil loading
acting on the wall. For example, stone riprap dumped against the exterior toe of
the wall will add resistance to the movement of the toe. Alternatively, or in
addition, backfill can be removed from behind the wall and replaced with
lightweight granular fill. This type of fill is free draining, which reduces the
hydrostatic pressure behind the wall and allows the water level on both sides to
balance.
Application: Reinforcing or replacing the tieback system may be restricted to
correcting slight to moderate wall deflection. Excessive deflection may require
wall replacement or major restoration.
Future Inspection Requirement: Carefully inspect the wall for further signs of
continued deflection or steel member failure.
8-19
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