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The CHANCE® SOIL SCREW® is a method for reinforcing the earth to construct retaining walls.
In this "soil nail" application, a Chance screw anchor acts in a bearing mode compared to grouted anchor, which relies on friction. This gives the SOIL SCREW economic advantages. Bearing plates are spaced along the entire length of SOIL SCREW anchors. They are ready for immediate loading as soon as installed.
Backhoes and skid-steer loaders can quickly rotate SOIL SCREW anchors into place. Anchor size and grid spacing are designed to local soil conditions and load requirements. A reinforced-shotcrete veneer often is applied to the wall face.
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Tiebacks: A pre-engineered tieback system for earth retention supplied by the largest manufacturer of anchors in the world simplifies the challenges for contractors. These tieback anchors are installed by rotating the anchors into the ground with common rotary drilling equipment. 
Once the minimum depth is obtained the capacity can be determined by reading the installing torque and correlating it to the holding capacity ratio. 
Capacities to 200,000 pounds per anchor are obtainable with this system. Proven on hundreds of applications these cost effective tiebacks can be tested immediately. No concrete to wait for curing! This saves time and money plus improves schedules.
Ambrose Homes uses the Chance anchor tieback system for these reasons: - Installed anchors can be proof-tested immediately -- no waiting for grout to cure.
- Install in almost any weather, with conventional drilling equipment. No concrete trucks or grout pumps required.
- Predictable holding strength in all soils.
The success of the screw anchor tieback system is based on decades of similar use of CHANCE anchors by electric utilities. The proven reliability and engineered predictability of the system's performance give you tiebacks that are positive, economical and hassle-free.
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