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Wind Turbine Foundations

Contech and Patrick and Henderson Inc. offer a track record of proven wind turbine foundations to meet the needs of today's large scale wind turbines (1.5-3.0 MW), as well as foundations for future turbines of much larger scale.

These foundations are engineered to withstand:
FLOODS | EARTHQUAKES | BLADE STRIKES | HURRICANES

Contech CMP Wind Turbine Solutions

We can help design a solution to fit your site's needs. Have our wind expert contact you for assistance on your project or to answer any questions. Call 855-450-WIND or complete the form to request additional detail.

Contech's CMP deep foundation bases are available to support wind turbines or vertical shafts and our MOBILE PIPE® mill is an ideal solution for remote sites, providing fast and cost-effective onsite steel pipe manufacturing.

Additional Wind Farm Solutions Applications

  • Culverts – Flexible options for directing storm flows where you need them to go.
  • Stream Crossings – Cross streams and other environmentally sensitive areas with our reliable bridges and structures.
  • Slope Stabilization – Prevent movement and downslope erosion and provide support for grade changes with our hard armor products.
  • Haul Roads/Tank Trails – Easily support heavy loads with a variety of roadway and crossing solutions.

Tensionless Pier Wind Turbine Foundation

The P&H Tensionless Pier is a patented, proprietary foundation to support wind turbines on monopole towers. The foundation consists of a large diameter, cast-in-place annular pier (typically 14 to 16-feet in diameter and 25-feet to 35-feet deep).

Advantages of the Tensionless Pier Wind Turbine Foundation

  • Turbine sizes: 100 KW to 3 MW installed, with capacity for larger. Supports the largest turbines to date both in North America and internationally.
  • Most efficient, cost effective foundation solution – more than 6,000 installations
  • Typical and historical foundation savings more than 25% as compared to shallow foundations in various soil conditions
  • Most efficient utilization of time and resources
  • 3-6% reduction in total project development costs
  • Well suited for varying soil conditions See the Turbine Foundation Material Comparison Chart.
  • Deep foundations are superior for seismically active zones, floodwater inundation, flood scour, frost depth, creeps and landslides
  • Extended fatigue life characteristics due to post tensioning
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Anchor Deep Foundations

The P&H rock or pile anchor foundation is a proprietary (patent-pending) foundation used to support large wind turbines. The P&H anchor foundations consist of a 5-foot thick, 24-foot diameter, reinforced concrete mat (cap) supported by commonly 12 to 20, 35 to 50-feet long anchors aligned within a typical 20-foot diameter circle. Large wind turbines greater than 2 MW may require more anchors and a double row.

Large 2-½ inch diameter rods are used as the anchors. The number and length of anchors are based on the magnitude of applied loads at the top of the foundation as well as the soil and rock conditions. The pile or rock anchors are installed by drilling a shaft and the anchor rod is inserted and grouted. Post-tensioning is used to develop an internal tension force in each anchor. The intention is to have enough tension in the rod to reduce foundation deflections from normal wind loading.

The large overturning moments induced by the wind turbine are resisted by friction (bond stress) along the length of the anchors. The anchors are post-tensioned to create a compression stress on the subgrade beneath the cap. The post-tension load resists the overturning moment by creating a built-in clamping force to keep the cap in place. The higher the pre-tensioning of the anchors results in a higher moment capacity of the foundation. The post-tension load in the anchor is calculated to cover the load imposed by maximum wind forces given by the turbine manufacturer. Normal operational loads do not produce stress reversals in the subgrade/concrete interface or the anchor so there is no substantial fatigue or cyclic degradation of the soil or rock.

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Advantages of the Anchor Deep Foundations

  • Ability to support the largest available turbine systems
  • Anchor foundation systems excel in every soil type
  • Reduced footprint and site disturbance
  • Reduction and potential elimination of blasting requirements
  • Increased stiffness and long-term reliability
  • Maximizes material and resource efficiencies
  • Superior for mountain and remote access sites

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