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Power-installed foundations have been proven in thousands of installations throughout the world. These instant foundations come in two forms; non-extendible foundations, for site lighting or any pole support (Click here for figure 4a), and extendible foundations, for deeper bearing soils. Chance engineers have installed, tested, and retrieved countless foundations to confirm performance and durability. The predictable holding strength of Chance foundations are achieved by matching the installed torque of the foundation to the retention capacity of the soil. Predictable holding strengths for almost any load obtainable in most soils-from loose sand and clay to caliche and weathered sandstone. A typical foundation can be installed by AHPC in very little time using standard equipment. The superstructure can be mounted immediately - no waiting for concrete to cure. Chance foundations can be installed in all weather conditions, thus eliminating weather-related construction delays. They can function as permanent installations or serve as temporary foundations, which can be easily retrieved and reused.
A typical non-extendible foundation installation can be made in about 30 minutes using conventional rotary equipment. Torque capacities vary from 10,000 to 25,000 foot-pounds depending on diameter of foundations. Once the foundation is installed, load can be applied immediately. Soil parameters usually dictate function the number of foundation anchors to support a given load. The lateral-load capacity of an individual element is function of the pier length, diameter and soil strength properties. The large-diameter helix on the foundation usually provides sufficient compression-load capacity and standard base-plate bolt patterns accommodate most attachments. Custom-made patterns can be made to meet specific needs. Each year, hundreds and thousands of Helical-Pier foundation anchors are produced and installed, solving many challenges unattainable by conventional methods. The "Chance Helical-Pier System" offers a technically superior and cost-effective approach. The galvanized steel Helical-Pier units are pre-engineered to transfer projected loads to bearing-capable strata below weak soils. This isolates the structure's integrity from seasonal changes in the surface-layer conditions. To reach a sound geological footing, shaft extensions may be added during installation. Loads of up to 200 kps can be attained on a single pier.
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The Chance system includes a broad range of foundations with various attachments for field adjustments. AHPC support services include analysis of soil test probes and job-rated foundation recommendations.