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Geotechnical Report Back
A soil investigation by a geotechnical engineering firm is recommended for each tower site to determine its unique soil and physical characteristics, and to provide data to develop safe design parameters, economical foundation alternatives, and installation procedures. To ensure that the report furnishes useful information to the foundation designer, the geotechnical firm should be provided with the following information:
  1. A plot plan and site location map with tower, equipment building and other site improvements located.
  2. Tower base vertical reaction, shear, and anchor vertical and horizontal reactions for guyed towers; or maximum compression and tension (uplift) reactions with shear for self-supporting towers; or maximum overturning moment, compression and shear for monopoles.
  3. Any special conditions or requirements of the specifications.
  4. The minimum depth of borings for guyed tower bases should be 15-20 ft; for guyed tower anchors 10-15 ft; for self-supporting towers and monopoles, boring depth will vary depending upon the type of foundation being considered. The magnitude of the structure reactions, site and soil conditions may require altering the boring depth requirements.
The geotechnical report should provide the following information at minimum:
  1. Boring logs.
    1. Date, sampling methods, number and type of samples.
    2. Description of the soil strata according to the Unified Soil Classification System.
    3. Depths at which strata changes occur referenced to a site datum.
    4. Standard Penetration Test blow counts.
    5. Soil densities.
    6. Elevation of free water encountered and its level after 24 hours; and recommended ground water elevation to be considered for design.
    7. Maximum and average depth of frost penetration.
  2. Other soil characteristics or properties which may be required because of local conditions.
  3. A description of alternative foundation methods with recommendations for ultimate values for passive pressure, bearing pressure, skin friction, the angle of internal friction, other applicable soil properties, and appropriate safety factors.

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*TIA/EIA-222-F, “Structural Standards for Steel Antenna Towers and Antenna Supporting Structures”.

For further information on how to obtain Telecommunications Industry Association (TIA) standards please go to http://global.ihs.com or contact Global Engineering Documents at 1-800-854-7179 or 303-397-7956.


 
 
Sabre Towers and Poles, the tower division of Sabre Industries, Inc., designs and manufactures
guyed towers, self-supporting towers, monopoles, and concealment structures.

Sabre Towers and Poles • 2101 Murray Street • P.O. Box 658 • Sioux City, IA 51111
Toll Free: 800-369-6690 • Fax: 712-224-1601 • Email: sales@sabrecom.com

Copyright 2009 Sabre Industries, Inc. • All Rights Reserved
Designed and Developed by Sabre Industries, Inc.