Argyll and Bute Harbours
Argyll and Bute Council is responsible for 39 piers, harbours and slipways. Created by Argyll and Bute Council, the Asset Management Plan details work required over the next 10 years across the entire marine infrastructure. Council officers arrange inspections and meet with other interested parties on a regular basis to ensure that the plan meets the future needs of the service.
PREMIER ENGINEERING MAGAZINE spoke to Allan Finlay and Alex Leslie from Argyll and Bute Council about some of the work recently completed and currently ongoing as part of the Asset Management Plan.
Alex Leslie said: “The Marine Asset Management plan is something that has been developed over the last few years to look at the long term upgrading/development of our infrastructure. The income generated through our Fees and Charges meets the needs of the Asset Management Plan and, in principle, that is how it is funded; our income is used to fund the programme.”
A contract to address corrosion of sheet piling at Campbeltown Old Quay (Walls C,D,E,F) was won by contractor Lochshell Engineering with a value of £146k. Works include an on-site survey by the contractor, followed by off-site fabrication, installation of steel plate repairs and Cathodic Protection; works are due for completion this month.
A second project at Campbeltown Old Quay is currently in the design stages. This is for the replacement of 120m of circa 1941 Frodinham sheet piling (Wall A). Works are anticipated on site 2012/2022.
Allan Finlay said: “We are at the early stages of master planning for a new port development at Craignure.”
Following a meeting of the Harbour Board, a Scottish Transport Appraisal Guidance (STAG) report was completed. The report considers a number of costed options for replacement of the pier and a separate report was also presented to the September 2019 Harbour Board.
A contract to address rock armour settlement at Dunoon breakwater was awarded to the Contractor L.M Keating on 23 August 2019, valued at £812k.
Allan said: “This project is to reinstate and re-profile the existing rock armour at the breakwater. The core of the breakwater had been breached and the loss of material had resulted in settlement and movement of the primary armour stones. Circa 8000T of armour stones will be placed. Work started in November 2019 with completion expected this month.”
Fionnphort/Iona Ferry Slips
Work at Fionnphort/Iona Ferry Slips will see the construction of two new breakwaters; £8 million and £9 million respectively, in addition to improving berthing for the ferries at the slipways. The project will provide a new safe overnight berth for the ferry at the Fionnphort side, which will remove existing risks to the operation and enhance service resilience to the island.
Sedimentation analysis is ongoing and subject to detailed design and gaining necessary consents, works are anticipated on site 2021.
A tender was issued in mid-2018 to seek the services of a Mechanical Engineer with specialist link span experience. A specialist engineer, seconded from the consultant ‘Royal Haskoning’ has been working directly for Marine Services since the beginning of 2019. A complete review has been carried out on all Council link spans – at Dunoon, Rothesay, Campbeltown, Port Askaig and Craignure – this has taken the form of on-site inspections, reviews of maintenance records – both specialist and on-site maintenance – along with a complete review of extant link-span maintenance contracts. Recommendations were made to extend one of two existing contracts for a finite period with a view to re-tendering link-span maintenance in the near future.
Following initial surveys and recommendations, RL Engineering has completed their ‘first round’ of servicing on all link-spans since the contract extension was signed. The opportunity was taken to replace all hydraulic hoses at all five link spans during RL’s recent servicing works. Craignure link-span will require replacement of some major parts and work is ongoing to prepare for refurbishment work. Close liaison will take place with Calmac and, of course, the local community before works are carried out. Once planned works are completed at Craignure, a tender will be issued for maintenance of link-spans.
Work on the installation of a new wave screen was completed in August 2019. The wave screen is considered to be the first phase in the overall work required to address continuing settlement at Rothesay Pier.
Allan said: “The wave screen has been installed to reduce thrust/wave action against the old masonry quay wall and should prevent further deterioration on the structure and prevent further loss of material. We redeveloped the harbour just over ten years ago and were monitoring the old quay wall and identified a need to protect the integrity of it.”
Following the completion of the installation of the wave screen, further works (Phase 2) will be required in order to address the areas of settlement behind the quay wall and instability of the quay wall. Phase two of the project, which will involve grouting and mini piling, is currently at the early design stages, with the construction due on site this year. This will be around a nine to 12 month project.