A.B. Chance
a Division of Hubbell Power Systems, Inc.
210 N. Allen Street
Centralia, MO 65240 USA
Tel: (573) 682-8414
Fax: (573) 682-8660
E-mail: hpsliterature@hps.hubbell.com
Web site: http://www.abchance.com

Helical Pulldown^™ Micropiles

MR-Manufacturer

Manufactured by A.B. Chance, an ISO 9001 company, headquartered in Centralia, Missouri. With more than 97 years of earth-anchor research and development experience, A.B. Chance also markets to electric utilities, telecommunications and pipeline industries worldwide.

UA-USES, APPLICATIONS

Patented composite end-bearing/friction pile well suited for resistance to bending moments and lateral loads in poor soil conditions by transferring load to high end-bearing-capacity helical plates. It consists of a steel screw anchor with a 4" to 10" grout column around the shaft above the helical plates. High capacity: Tested to 410 Kips per pile.

PR-PRODUCT PRESENTATION

Design is specified per application and typically consist of square shafts (1-3/8" to 2-1/4" solid high-strength steel) with single- or multiple-helix configurations (typically 8" to 14") in combinations to match loads. Displacement plates added at extension joints form void in the soil filled by grout reservoir on grade as anchor is torqued into the soil. Column may be sleeved during installation if required

UA-USES, APPLICATIONS

Typical applications are construction and expansion of commercial and industrial building foundations, and tower foundations for power and telecommunications. Connections may be by steel fabricated brackets or integration into rebar gridwork of concrete pile cap.

AI-ASSEMBLY, INSTALLATION
Torque monitoring contributes to production control. Displacement plates form grout column to design depth. Measuring grout volume indicates formation of column. To estimate ultimate bearing capacity, an empirical factor (usually 10 ft.^-1) is multiplied times the average torque over the final 3 feet of installation. Special techniques and tools derived through experience and engineering expertise give Chance^® anchoring methods advantages not easily duplicated.

TS-TECHNICAL SUPPORT

To assist design professionals, A.B. Chance provides application-engineering assistance. Input required:
1. Soil data - involves depths of layers, strength parameters and type;
2. Anchor description – consists of extension length, installation angle, distance to datum;
3. Load – magnitude and direction.

Based on a multitude of various projects and soil conditions in our cumulative experience, A.B. Chance supports the following services:

• Certified installers
• Training
• Geotechnical engineering guidance for special cases
• Inventories of standard and specially designed products to match applications to soils.