Temp tie-backs for shoring wall?
Temp tie-backs for shoring wall?
(OP)
I am looking for ideas on how to tie-back a temporary shoring wall. Our current plan is to cast some rather large deadmen and use coilrod to tie back the pile. The problem with this approach is that the deadmen would be located within a embankment area and will interfere with the placement of the fill. I have looked at the Manta-Ray system, but everything I have seen says that it can only be used in "undisturbed" soils. We have also thought about driving a couple of anchor pile after the fill has been placed and cut these off below grade, but then we lose the piling. Any other ideas?





RE: Temp tie-backs for shoring wall?
1. drilled in soil anchors, 12 to 24 inch diameter
2. drilled in belled soil anchors
3. helical anchors
RE: Temp tie-backs for shoring wall?
Manta Ray anchors are capable of relatively low working loads. Manta Rays and the other anchors that GeoPaveTraffic mentions require various types of equipment to drill-in or drive the anchors. If the wall needs multiple tiers of anchors, it will be difficult to get the drilling equipment to each tieback elevation. I'd look at an MSE wall (with a wire basket facing) or sheeting with tie rods and deadmen unless the wall is less than 12 to 14 feet high and can be cantilevered. Check the bedrock elevation which could interfere with embedment of sheeting. Also consider settlement of the embankment and the additional loads this could put on the tie rods. Tie rods are usually designed for tension, not combined tension and bending.
RE: Temp tie-backs for shoring wall?
During the construction of the second bridge we will have a cut of about 14 to 16 feet. It would be at this point that we would attach a waler tied back to the deadmen at the original ground elevation. We will have approximately 22 feet of wall total with a pile embedment of around 6 feet. The soil layer is so dense that we don't have to worry about the toe giving way however, bending is the main issue. Once this phase is completed, we will backfill to the same elevation as the other bridge and pull the soldier pile.
RE: Temp tie-backs for shoring wall?