The Glen Mallan project team has been recognised at three construction industry awards for their work. The project won ‘Best Infrastructure Project’ at the Scottish Civil Engineering Awards 2021 and ‘Upgrade and Renewal Project’ at the British Construction Awards 2021. It was also a finalist in the Construction News Awards 2021 for ‘Best Large Project over £50 million.’
The Northern Ammunitioning Jetty at Glen Mallan on the shores of Loch Long in Scotland was refurbished between 2019 and 2021 to extend the design life of the existing facility by 50 years. The works were carried out by VolkerStevin under a design and build contract with Arch Henderson as the lead designer and also the Principal Designer under CDM regulations.
We carried out the detailed design of the new 135m long jetty which consisted of a reinforced concrete suspended deck supported on steel tubular piles. The piles were socketed in to rock using a combination of driving and drilling techniques. The deck soffit was formed using a series of precast beams and planks which were filled in using in-situ reinforced concrete. The jetty was designed to withstand mooring and berthing forces associated with the full British Naval surface fleet including the Queen Elizabeth and Prince of Wales Aircraft Carriers. It also supports two pedestal cranes capable of handling all shore to ship lifting requirements.
We also designed five mooring dolphins which were connected to the jetty via a series of steel walkways and intermediate support structures. The dolphins consisted of steel tubular raking piles supporting a pilecap formed of an outer precast shell filled with in-situ reinforced concrete. Each dolphin supported one or more quick release mooring hooks to allow mooring of all design vessels.
Four navigation aids were designed by Arch Henderson as part of the project. The navigation aids consisted of monopiles either socketed in to rock or driven in to alluvial sands. The navigation aid topsides; housing navigation lights, solar panels, and battery packs; were prefabricated off-site and fixed on to the lower monopiles using a grouted spigot piece.
Construction Stage
Northern return precast units placed onto tubular piles and northern bankseat pads
Driving and drilling of tubular piles in the 12 pile piling gate.
Driving and drilling of tubular piles in the 12 pile piling gate
Drone shot showing deck construction progressing along the jetty head
Fixing of in-situ reinforcement around the northern pedestal crane insert. The deck was locally thickened at the pedestal crane locations to withstand the associated imparted loads
Drone shot showing piling works on dolphin 4 and deck construction progressing along the jetty headHMS Queen Elizabeth
Completion
Awards
