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One year of construction at the Northern Ammunition Jetty

A drone image of the Northern Ammunition Jetty over the Loch Lomand sea. A big yellow and red crane is on the jetty along with a small white boat beside it. There is a road and lots of green trees on the right of the jetty.
The Northern Ammunition Jetty in Glen Mallan is being refurbished to support the Royal Navy's surface fleet in loading and unloading ammunition [Crown Copyright/MOD2020]
This week, marks one year since we started construction work to refurbish the Northern Ammunition Jetty in Glen Mallan, Scotland, to support the Royal Navy’s surface fleet and aircraft carriers in loading and unloading ammunition.

Since my last update, the construction of the jetty has really progressed and it’s rewarding to see refurbishment works taking shape. Bringing the Royal Navy’s surface fleet into Glen Mallan requires a new jetty structure, five new mooring dolphins, two pedestal cranes and lots more infrastructure.

What we’ve done so far

On the sea next to land is three rows of Jetty piles made out of steel. They are cylinder and black. They lead up to the Jetty.
The jetty piles support a reinforced concrete deck on the new jetty and walkways. [Crown Copyright/MOD2020]
We recently hit a major milestone by completing the installation of all 127 jetty piles into the seabed. These support a reinforced concrete deck on the new jetty and walkways. This  allows us to work “on land” from the new jetty deck which sits on top of the piles. The jetty piles are made out of steel and were produced between a yard in Glasgow and a mill in Turkey. They were driven into the seabed using a piling technique until they had a firm hold on the bedrock. They were then drilled out to allow concrete to be poured creating a bond between the bedrock and the pile.

We’re also installing four new navigational markers, which are special lights that will enable pilots to safely navigate in and out of Glen Mallan. The lights are mounted on large steel tower structures rising up to 30 metres from the seabed. The tops of these towers will be installed by a crane barge later in the year. The lights are powered by solar panels without using the national grid, which has saved the team at DIO and VolkerStevin the job of having to lay electrical cables into the seabed. To minimise disruption to local vessels and the public, the lights will only be visible along certain routes.

We’ve also installed 20 fender panels along the front of the new jetty structure. Once all the fender panels are in place this will create what is known as a continuous berthing face, enabling all vessel types to use the new jetty. Two modular fender spacer units have been fabricated for the Queen Elizabeth Class aircraft carriers that move with the tide to prevent the vessel’s overhanging flight deck from colliding with the jetty. They are currently being constructed in Holland.

What’s next

A yellow crane is pulling concrete out from the soil. There is a working in orange visible jacket sitting inside and some workers outside.
Staff and contractors continue to work on this critical infrastructure project throughout COVID-19. [Crown Copyright/MOD2020]
We’re continuing to place prepared moulded concrete units onto the piles and pour on wet concrete. Once this is complete, we can start  work on installing the buildings onto the jetty deck including  stores, back-up generators and pre-fabricated modular buildings for the offices. In addition, we will be installing a modern firefighting system to ensure our operatives on site are safe.

We’ll also be installing two modern pedestal cranes which will help to ammunition all vessels safely and efficiently, and will be replacing the old rail mounted portal cranes which have reached the end of their lifespan.

Challenges we navigated through

The past year has been challenging, but extremely rewarding and I’m proud of the progress that we’ve made so far on the refurbishment works. Without the hard-work, commitment and collaboration of our staff, contractors and local companies, we wouldn’t have made the progress we have today.

We take the safety of our workers very seriously, who continue to work to deliver this critical infrastructure programme for Defence. We’re regularly keeping in touch with them and following the latest government guidelines to help protect our workers against Coronavirus.

In Spring 2021, the refurbishment of the jetty will be complete, helping to provide the Armed Forces with the capabilities they need to maintain Britain’s security in an ever-changing world. Keep an eye out on our Inside DIO blog for further updates on Glen Mallan.





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