CHANCE® helical piles and helical anchors have found increasingly widespread use within the structural and geotechnical engineering industries. The increased use is a direct result of the versatility and cost-effectiveness of the helical system. The ability to be utilized in both tension and compression applications make the pre-engineered system an attractive alternative to the foundation stabilization and earth retention sectors of the construction industry.
Helical piles and anchors have the built in advantages of rapid installation with small equipment, immediate loading capabilities, and cost efficiency when compared with traditional foundation methods such as concrete piers and driven piles. Helical piles and anchors also feature built in quality control through real-time tracking of the torque-to-capacity ratio during installation.
THE DESIGN AND THE PROCESS
The helical system is segmented with helical bearing plates welded to a central steel shaft. Load is transferred from the structure through the shaft to the soil through the bearing plates. Central steel shafts are available in either Type SS (Square Shaft) series or Type RS (Round Shaft) series. SS-RS combinations are available when conditions require a deep bearing strata with an increased need for lateral stability.
Segments or sections are joined with bolted couplings. Installation depth is limited only by soil density and practicality based on economics. A helical bearing plate or helix is one pitch of a screw thread. All helices, regardless of their diameter, have a standard 3" pitch. Being a true helical shape, the helices do not auger into the soil but rather screw into it with minimal soil disturbance. Helical plates are spaced at distances far enough apart that they function independently of each other as individual bearing elements; consequently, the capacity of a particular helix on a helical pile or anchor shaft is not influenced by the helix above or below it.
The Helical Pulldown™ Micopile (HPM) overcomes obstacles faced by traditional foundation methods and serves a growing number of applications throughout the industry. Higher load capacities and additional lateral stability in weak surface soils can be achieved by utilizing this patented micropile technology. The pulldown micropile brings the advantages of the pre-engineered helical system to the heavy micropile and anchoring markets providing tension loads of 70,000 lbs to 200,000 lbs and compression loads of 20,000 to 400,000 lbs. Click for more.
Feel free to contact us with questions or concerns regarding helical applications, feasibility, design assistance, or project estimates.. Our staff of professional engineers will be able to assist you with any needs you may have. 800.773.2368.