Project Hurunui Wind Construction and Project Overview

Project Hurunui Wind Construction Effects and Management Report
Currently a minimum vertical curve radius of 200m has been adopted based on the ground
clearance of a multi-axle platform trailer with 0.5m wheel articulation. It is recognised that
this may be further reduced if the final trailer configuration permits.
Where access road grades exceed 12.5%, we envisage that haulage of the heavier turbine
components, such as tower sections and nacelles, may require additional tractor units,
dozers, or assistance by winching. An upper bound gradient of 15% has generally been
adopted. Steeper gradients may be applied at straight or broad sweeping sections if
unavoidable, subject to a maximum limit of 20%. At tighter horizontal curves, the gradient
has generally been limited to less than 12.5%.
Appendix C illustrates typical tower and blade transport configurations. Actual transport
configurations will depend on the selected turbine.
(b) Nacelle units
Depending on the turbine, nacelle units typically weigh 90 tonnes (which typically includes
an 8 tonne transport frame). Typical road transportation details/schematics (provided by
turbine manufacturers) are attached in Appendix C. An example of an off-road
configuration is also illustrated.
The minimum geometric criteria for transport of the nacelle units around the site are within
the parameters assessed for the blade and tower sections.
(c) Main erection crane
An erection crane capable of lifting the tower sections, nacelle unit and rotors to the top of
the towers (typically 80m) will need to access each turbine site. The erection crane
proposed for this project may have a crane track width of up to approximately 5m. A
photograph of a typical crane is shown on Photograph F1 in Appendix F.
An access road width of approximately 6m is expected to accommodate the main erection
crane based on its operational requirements. This width has been assumed for all roads
within the core site although further detailed design may reduce this width down to 4.5m
towards the end of roads and along spur roads depending on the final crane configuration.
Based on feedback from cranage service providers, a maximum access road grade of 17%
(5.7H:1V or 10 o ) is considered negotiable by a crawler crane that is unloaded with the boom
up. The crane can also negotiate road grades in excess of 17% by removing the crane’s
boom which may be required along a limited number of road sections.
(d) Turbine platform at turbine locations
The turbine platform at each turbine location is an integral part of the road access. The
turbine platform merges with the road access to enable transporters to deliver turbine
components and provide a working platform to both construct the turbine foundation and
erect the turbine components. Turbine platforms and the access roads are constructed at
the same time and therefore the preliminary design criteria for both are considered
together.
Based on experience gained at Project Te Apiti, Project White Hill and Project West Wind
together with feedback from turbine manufacturers and cranage service providers, a
5C-1604.02
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