Plymouth - Jupiter Point Restraint Piles

Case Study Overview

The existing mooring pontoon system at HMS Raleigh Naval Sea Training School had reached the end of its lifespan. The proposed £1.9-million-pound modernisation works being carried out by Falmouth Divers Ltd consists of replacing the existing pontoon network and the installation of two 610mm x 20m long rock-socked restraining guide piles to support the new 35m landing walkway.

At a glance

  • Location: Torpoint, Plymouth 2020
  • Plant used: 400t Jack-up Barge ‘Haven Seaseven’
  • What we did: Red7Marine supported main contractor, Falmouth Divers Ltd, with the installation of two rock-socket restraint piles for a new landing pontoon platform

Why Red7Marine?

Red7Marine (R7M) operates the largest fleet of jack-up barges (JUB) in the UK. With a proven track record, we could offer Falmouth Divers Ltd the required resources with the added assurance that our elevated platform would provide a safe working platform to the client even in a challenging marine environment. This was a key factor as the project was programmed to be carried out over the winter months.


What makes the project standout?

The piling project was delivered from inception to installation on behalf of Falmouth Divers Ltd, with our in-house marine plant and labour. The works were carried out safely to the specification and within programme. The project’s programme dictated that the works could only be carried out over the winter break due to restraints within the Naval base. Key factors that led to the successes of the project are listed below:

  • The R7M engineering department detailed the utilisation of the 400t jack-up barge at tender stage to Falmouth Divers Ltd, providing a full turn-key package. The modular jack-up barge provided a working platform which meant both piles could be installed in one location. This bore dividends in the timescale for completion, the monetary value of the project and the risk profile as only one setup was required.
  • Rapid mobilisation – working in the harshest weather months of the year, it was integral that the project was completed safely and expediently within a two-week timeframe. All key items of marine plant and equipment were mobilised to site in just four days directly after the Christmas break.
  • Both 610mm diameter piles were installed to level and within tolerance in four days to comply with license deadlines. R7M designed a bespoke piling gate to accommodate the pile and casing that could be easily transferred on-site to each piling location, therefore saving time and cost.
  • The project was carefully planned in conjunction with Falmouth Divers Ltd and executed where R7M was able to deliver the full package of works from one barge in one primary location.



The Challenges and Solutions

To ensure successful delivery, several challenges were overcome during the planning and construction phase of the project:

  • The site is located within a Naval base in close proximity to a Site of Significant Scientific Interest (SSSI). R7M worked closely with the client, Falmouth Divers Ltd, utilising a small site-team to find solutions to several key issues to ensure the necessary passes and consents were in place before the construction works commenced.
  • The site information was restricted with historical data detailing an expected ground makeup comprising of hard sandstone. This unknown ground risk augmented the threat of on-site delay due to deferred drilling outputs. R7M mobilised with surplus drill tooling to overcome any unseen hard ground should it have arisen, mitigating the need for remobilisation.
  • The 15t bespoke piling gate designed, detailed and manufactured in-house specifically for the project meant that both piles could be installed from one barge location quickly, safely and to tolerance.
  • All works had to be planned within a constricted schedule. R7M utilised a small multi-skilled site team taken from our domestic labour pool specifically skilled in rock-socket installation. All required materials were loaded on to the barge before mobilisation making the team totally self-sufficient once on-site.
  • The Project Manager and Engineer that supported the barge team on-site had been involved with the project from tender stage. This early involvement offered an in-depth knowledge and understanding of what was required having been involved with the project from the engineering solution stage.

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Red7Marine’s operations and engineering teams are all highly skilled and experienced in the marine environment providing partners with an industry-leading service.




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“Falmouth Divers Ltd contracted Red7Marine at the end of 2019 to undertake the installation of two rock-socketed piles at the Jupiter Point Royal Naval training facility near Torpoint. Red7Marine mobilised its SeaSeven jack-up vessel from Liverpool and transited it to Plymouth in early January through a gap in the seasonally bad weather. The mobilisation was conducted efficiently within a week as planned.”

Garry Duff, Engineer Falmouth Divers