Jackets are a popular choice of fixed wind foundation in deeper water depths of 30m-80m, and in regions with challenging ground conditions, where the use of smaller, shallower piles can reduce installation risks. Jacket foundation piles are usually pre-installed for efficiency, and installation is done using a pre-piling or pre-drilling template to ensure that they are within the required tolerances. These templates require a precise and intelligent design process to ensure they deliver safe and efficient offshore operations.
Turnkey Delivery
2H provides complete design and engineering services for pre-piling and pre-drilling templates. We leverage our design experience, a global footprint, and partnerships with local supply chains and fabrication yards around the world to deliver cost-effective templates that meet our clients’ requirements for safe and reliable offshore operations.
Design Considerations for Pre-Piling Templates
Template configurations can vary significantly to suit the pile size and arrangement, the local ground conditions, and the wider installation spread. In some cases, templates can be made adjustable for use on multiple projects with different specifications.
The installation of jacket piles is a precise operation and depends on successful template operation. Pre-piling templates generally incorporate the following features:
Survey systems to ensure the template is orientated and positioned correctly before piling.
A hydraulic levelling system to ensure that the template is orientated horizontally for accurate positioning and verticality of the piles.
Hydraulic pile guides to accurately position the piles during driving. These tend to be retractable to allow passage of the piling hammer/follower.
Active control system functionality to aid the above.
Additional features may include:
Integration with drilling systems, where either relief drilling or drilled and grouted pin pile sockets are required.
Integration with drill casings for areas where socket stability is a risk.
Noise suppression to reduce the acoustic effects of the hammer.
Mudmat breakout mitigation systems to ensure that the structure can be retrieved in a variety of soil conditions.
