Chance® Tie Back Anchors
A.B. Chance has led the industry in manufacturing of multi-helix screw anchors since the 1950’s. Screw anchors have a definite advantage over other products, with their consistent record of growing use and their strong reputation earned through extensive use in tieback, electrical-utility and petroleum industries.
Ten Advantages to Screw Anchor Application
- Removes uncertainties and costs associated with a grouted anchor when used in loose, sandy soils and low-shear strength clay soils.
- Screw Anchors may be installed with conventional rotary drilling typically used in grouted-anchor tieback construction.
- Installs without drilling or spoils removal, cutting labor and equipment costs by as much as 30%.
- Fast and easy installation (typically takes 20-30 minutes). A rate of 30-40 per day for installing and testing is not uncommon. The designed procedure is based on the popular General Bearing Capacity Equation.
- Since grouted is eliminated, testing is immediately possible following installation.
- Soil strength can be determined by monitoring torsional resistance, which assists in ascertaining anchor load capacities and avoidance in overstress.
- Screw anchors can be withdrawn and reused, making them usable for temporary installations.
- Ultimate tensile capacity of screw anchors can be as high as 200 kips.
- Since there is no need to create an open hole or casing as there is with a grouted anchor, there is no risk of the anchor’s dimensions changing.
- Can be installed in any weather conditions.
Our Tieback anchors can be matched to soil and heavy tension loads in the same way as the Chance® Helical Pier Foundation System Anchors are for compression applications. They’re ideal for building-site preparation, roadways, retaining walls, levees, dams, and revetments. While always competitive, they are most attractive where caving soils otherwise would require casing, and also in high water table areas.
Total Basement Systems offers Chance® Tie Back Anchors to Maryland, DC, and Northern Virginia.
