1. Greenwich Wind Farm, Greenwich, ON
General Contractor: Renewable Energy Systems Americas, Inc.
Foundation Contractor: Swan and Associates
Drilling & Anchor Contractor: Geo-Foundations Contractors, Inc.
Post-tensioned Anchor Supplier: Con-Tech Systems Ltd.
Summary:
The Greenwich Wind Farm in Ontario Canada will
consist of 43 each Siemens 2.3MW-101 wind turbines.
The nacelles are mounted on top of 80m tall steel
tubular towers. The tower foundations are sited on
competent rock, typical for the region in Western
Ontario. The small diameter (8.0m) shallow concrete
foundations are tied down with 16 each post-tensioned
strand anchors. Each anchor tendon contains 18
strands for an ultimate capacity of 4691 kN (1055 kips).
The anchors have a bonded length of 5.0m and an
unbonded length of 8.0m for an overall anchor length
of 13.0m.
All anchors are re-stressable, so that their integrity can
be tested during their service life. Also available are
monitoring systems for these anchors, which would
allow for real-time monitoring. These have not been
installed here.
Geo-Foundations Contractors drilling (left) and
Con-Tech Systems Ltd. strand anchors waiting for installation (right)
www.contechsystems.com
ctswest@contechsystems.com
Tel.: Joe Alter @ 619 659-9931

2. The production schedule demand for this project is
very high. Initial plans were to construct 4 finished
foundations per week. This meant an anchor
production of 72 anchors per week and a total anchor
fabrication time of about 10 weeks. Con-Tech Systems
Ltd. produced the anchors within the required
schedule.
Unlike other wind farms, these turbines are distributed
over a much larger area. This makes them visually less
intrusive, but increases the demands on the logistics
for installation.
Foundation construction will continue through the
winter, so that tower and turbine installation can
proceed as planned in February 2011.
Typical Anchor Detail
Anchor stressing demonstration Typical rock formation on the site