Tied-Back Retaining Walls
Structural Support Retention
Earth Retention Stabilization
Rock Anchors/ Soil Anchors
Soil or Rock Anchors generally consist of steel elements (DWYIDAG thread bar) grouted in a drilled hole. The thread bar is subsequently tensioned. This provides lateral or vertical force to resist movement of a retaining structure. Anchors are often used for excavation support, or as a part of permanent retaining walls, or to resist up-lift forces on foundations. R.S. Foundation Systems uses rock anchors to stabilize slopes and walls, provide tiebacks for bridges, stabilize dams, and secure caisson walls.
Tied-Back Retaining Wall
Tiebacks may be used in conjunction with a variety of retaining systems (sheet piles, soldier piles, secant and tangent walls to provide additional lateral resistance beyond that achievable by a cantilevered wall. Tiebacks are drilled into the ground with a small diameter shaft. They can be horizontal but are typically installed at an angle of 15 to 45 degrees. The tie-backs are constructed of thread bar or steel strands which is inserted into the small drilled borehole. The shaft is grouted which encases the steel and bonds it to the surrounding ground. The steel is stressed to a design load and locked-off to maintain the load on the tie-back. Tie-backs can be installed in one or multiple rows as required to support the excavation depth.
Soil nailing is an economical technique for stabilizing slopes and for constructing retaining walls from the top down. The technique involves the insertion of relatively slender reinforcing elements into the slope – often general purpose reinforcing bars (rebar) although proprietary solid or hollow-system bars are also available. A rigid facing (often pneumatically applied concrete, otherwise known as shotcrete) or isolated soil nail head plates may be used at the surface. Alternatively a flexible reinforcing mesh may be held against the soil face beneath the head plates.