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Tiebacks Support Excavations Without Bracing

by Donald T. Goldberg, (M.ASCE), Principal; Goldberg-Zoino & Assocs., Newton Upper Falls, Mass.,
M. Daniel Gordon, Partner; Park View Homes, Colorado Springs, Colo.,


Serial Information: Civil Engineering—ASCE, 1977, Vol. 47, Issue 12, Pg. 62-65


Document Type: Feature article

Abstract:

Tiebacks are used to support earth retaining walls in deep excavations without using internal bracing. Although more expensive than bracing to construct, tiebacks can result in overall project savings by providing a clear work area. A tieback consists of a concrete or pressure grout anchor deep in the earth behind the wall being supported and a tie, which connects the wall to the anchor. The design of the anchor is empirical; experience is essential. Ties are designed as tension members and are usually steel bars or cables. The article discusses design considerations, describes the different procedures for installing tiebacks, lists contingencies that must be considered, tells when tiebacks cannot be used and compares the advantages and disadvantages of cables and bars for use as ties.

Subject Headings: Cables | Tieback (geotechnical) | Bracing | Anchors | Excavation | Bars (structure) | Walls

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