Steel Sheet Pile Wall

[MMS2007]

I have situation where the Permanent sheet pile wall has a tie back system, Contractor wants to know: How the anchor bar will be tensioned? Either indirectly by placement of the backfill or by direct application of some predefiend tension or torque before backfill placement?

 

[PEinc]

If you are significantly filling behind a wall, you should not be using a tiedback wall design.

Tiebacks are stressed using a center-hole, hydraulic jack with a calibrated pressure guage and sometimes a load cell. The tiebacks are not supposed to be stressed by movement of the wall when backfilling.

It is also a very bad idea to place backfill over a bar tendon. This can cause bending of the tieback bar tendon which adds a stress for which the tendon was not designed and which can cause tendon failure. If too much fill is placed before the tieback anchors are installed and stressed, the sheet pile wall will move forward excessively. If the tiebacks are stressed before

If neither you nor the contractor know the answer to the question, then neither of you should be designing or building the wall. You should have an engineer and a contractor who are experienced with tiedback walls.

 

[DRC1]

If we are talking about a drilled in anchor (either bar or stand) I agree with PEInc. If we are talking about a tie back rod to deadmman sheeting, that is a little more forgiving. Typically the sheets are driven plumb. The fill is brought to the level of the rods. The rods and wales are instaled and the bolts are brought up snug. If possible the sheets may be deflected back (toward the deadman) slightly. The balance of the fill is brought in. Use light hand compaction (such as a GAS plate tamper) adjacent to the wall. The anchors should be fine. However, you really need a specialty contractor to properly develop a drilled in anchor and lock it off. Also the designer should provide guidance on testing & lockoff procedures for drilled in anchors.