Anchors & Soil Nails
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Chance® Helical Tieback Anchors are used to stabilize and anchor retaining or basement walls damaged by lateral loads from earth and water pressure. Tieback anchors are installed by rotating the anchors into the ground with a rotary torque motor. Capacities up to 200,000 pounds per anchor are obtainable with this system and are available in either a square or tubular shaft configuration. The Chance Helical Tieback Anchor can be proof tested immediately, as there is no grout to cure. Installation of the helical tieback can take place in almost any weather with conventional drilling equipment. No concrete trucks or grout pumps required. There are also customized drilled and grouted support systems available.
Chance® Soil Nails
Chance Civil Construction provides the Soil Screw® Retention Wall System as an efficient and economical system to retain soil during excavation and construction of structures. The soil screw anchors have 1 ½” square shaft with 8” diameter helices. The lead section and extensions vary in length from 53” to 70” and provide a 55 kip torque rating and 70 kip ultimate tension rating. These soil nails are used in conjunction with a shotcrete facing to retain soils. The following are some advantages of this system over other soil retention methods:
- Fast installation without specialized equipment
- Immediate support without curing time
- Reduced installation time
- Post tensioning not required
- No need for H-piles, walers and heavy reinforced walls
- Immediate onsite capacity verification
- Excavations adjacent to and deeper than existing structures often use Atlas Resistance® Piers with soil nails
Grouted tiebacks are ideally post-tensioned and used to secure sheet pile, bored pile, beam and timber lagging, and concrete walls. The grouted anchors transfer the tensile forces from the steel rod to the grout body and then to the surface friction of the surrounding soils. All grouted anchors have a free anchor length and are post-tensioned to approximately 80% of their designed working load. The steel rod diameters vary from 1 to 3”. Hole sizes range from 3.5 to 10” and can support loads up to 1,000 kips for both temporary and permanent applications. Corrosion protection for tiebacks is specified per PTI as either Class I or Class II.
