Base Foundations
- a general guide
Typical foundation options for poles are ground planted, shear or flange based stub mounted and flange based with concrete pad or pile foundations.
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Make your choice from one of the options below for additional information.
NOTE: All foundations which are not standard will be designed specifically for each situation. We will happily discuss any special requirements and provide information on request.
Structural Notes
Concrete compressive strength (fc) shall be 25 MPa at 28 days. Materials and workmanship shall be in accordance with NZS 3109:1997. Concrete placement and curing in cold weather shall be in accordance with the recommendation from ACI 306-66.
A 200mm minimum layer of well compacted cement stabilised AP40 fill is to be placed under the concrete pad.
Steelwork to be hot dip galvanised after fabrication to AS/NZS 4680:2006.
Reinforcement bars shall comply with NZS 3109:1997. 'R' denotes grade 300 plain bar. 'D' denotes grade 300 deformed bar. 'RH' denotes grade 430 plain bar. 'DH' denotes grade 430 deformed bar. 'RH500' denotes grade 500 plain bar.
Provide duct for cable entry as required.
Minimum allowable soil bearing pressure shall be 100 kPa or as advised by a geotechnical assessment.
Contractor to provide orientation and location.
Only approved designed light fittings and attachments may be used (i.e. no additional attachments are to be fitted to any part of the pole without written approval from Spunlite Poles Ltd).
Backfill hole with cement stabilised AP40 fill well compacted in 200mm layers for ground planted poles
NOTE: Foundation design information supplied is intended as a guide only. Other solutions may be more appropriate for specific situations and locations. Due to variations in site conditions and installation procedures,Spunlite does not accept legal liability for the use of this information. If requested, Spunlite will design specific foundations for each project. Alternatively, Spunlite recommends the engagement of a competent Chartered Engineer to determine the suitability of a specific foundation design and geotechnical site evaluation.
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NOTE:
This reinforcement layout will be suitable for most situations however reinforcement layout and quantity can be subject to change depending on depth of pad required due to ground conditions and specific pole loadings.
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Pad and Pile Foundation Size Guide
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The above table assumes a constant wind sail area of 5m² for all heights, a regional wind speed of 46m/s (ULS) and Mz,cat=3. It is a general guide only with specifications varying substantially due to location and windage. Other solutions may be more appropriate for specific situations. Due to variations in site conditions and installation procedures, Spunlite does not accept legal liability for the use of this information. If requested, Spunlite will design specific foundations for each project. Spunlite recommends the engagement of a qualified Chartered Engineer to determine the suitability of a specific foundation design and geotechnical site evaluation.
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Typical Ground Planted Foundation
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