Transpower Tower Foundation Strengthening – Upper South Island Grid Upgrade
Construction Techniques Group Ltd

Severe weather conditions on several occasions in the last few years have highlighted New Zealand’s need for a secure electricity transmission system.

This project involved inspecting the foundations of about 1,000 towers to ensure that two lines in the north of the South Island could withstand adverse weather. Additional conductors were added in some cases thereby changing loadings on the foundations.
A variety of strengthening techniques were developed for the range of sites involved, which were spread over 450 kilometres. Great care in planning and implementation was required to manage demanding environmental constraints, restricted communications channels and the need to work with live lines above the sites.

The knowledge and experience gained through this remarkable project will undoubtedly be used in the future to help preserve the integrity of power transmission systems here and overseas.

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