Case Study Overview
Red7Marine supported principal contractor Farrans Construction at the Twelve Quays Jetty Construction. Our in-house engineering department conceptualised, designed and implemented all temporary work solutions, planned and managed project risks, whilst our Marine Operatives oversaw the installation of four raking piles as part of an ongoing contract.
At a glance
- Location: Birkenhead
- Plant used: Haven Seariser 1 and Haven Seaseven Jack-Up Barges
- What we did: Visited our client’s project site and studied project documentation. Planned and delivered all temporary work solutions which included: an access and egress solution, single & double-layered piling gate, jack-up stability assessments and a site geotechnical review. We planned all marine operations to suit Red7Marine’s bespoke marine vessels. Our Marine Operatives also oversaw the entire marine operation and carried out the complex installation of four raking piles and new berthing piles from our 250t & 400t Jack-Up Barges. These modular barges played an integral role in providing stable working platforms for the ongoing contract.
Our team faced unpredictable marine conditions throughout this project including a 10m tidal range, strong winds and large swell. As part of the works, we supported the installation of 14 vertical piles and four raking piles which proved to be particularly challenging, because of the surrounding existing structures, UXO risk, unprecedented geotechnical and environmental conditions.
- Due to the large tidal range, currents reached > 5m/s, and unsheltered waters resulted in regular wave heights > 3m.
- Geotechnical conditions presented multi-layered soils with high risk of punch through and scour across the marine site.
- Dual angled raking piles designed next to the existing jetty resulted in constructability issues and limited space to conduct piling works.
Speaking of these challenges, Jacob Ben-Arie, Maritime Engineer, says: ‘The Twelve Quays project was located on the River Mersey and provided difficult environmental conditions for all Marine Construction activities. It is Red7Marine’s technical capabilities and experience that enables such challenging projects to be delivered successfully for our clients’.
Red7Marine engineers and marine operatives provided the client with solutions throughout the project’s life cycle. Planning marine operations, designing temporary works solutions and assisting with fabrication and implementing solutions on site.
All site movements were planned to reduce risk and ensure safe operations were conducted, planning around slack waters and weather windows, reviewing detailed forecasts day-to-day.
Detailed JUB stability and leg penetration assessments were carried out across the site, enabling risks to be mitigated and associated procedures implemented.
Large scale temporary works were designed, fabricated (in-house) and implemented on site by Red7Marine to overcome complex raking and vertical pile installation requirements. Over 250T of steel was managed across Red7Marine’s barge over the project lifecycle.
The flexibility of our Haven Seaseven and Haven Seariser 1 allowed us to deliver the works despite these challenges, whilst our team’s determination meant that the project was completed in a timely manner.
Complete Package Delivery
Red7Marine provided equipment, crew and engineering support to the project to ensure our clients’ successful delivery.
Red7Marine provided specialist barge and marine experience to the project.
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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