A74(M)/M74 - Northbound and Southbound

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  • Construction
  • Temporary Access and Roadways

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John O'Donnell

Sales Manager - North and Scotland

07990 587847

Challenge

The A74(M)/M74 is a busy motorway forming the main route between the Border and the central belt of Scotland, carrying around 30,000 vehicles every day. A programme of upgrading works was set in place to improve the condition of the road, which is 20 years old in some places, and extend its long-term life.

For planned resurfacing works to take place on the Northbound and Southbound carriageways, protection to both the travelling public and workforce was necessary, and would require Mabey to supply a substantial amount of BarrierGuard 800.

The work was split into four stages, with each phase of work requiring a minimum of 3km of BarrierGuard per carriageway. Each phase was carried out over a three week cycle, with Barriers required in place for approximately 12 days per phase while the resurfacing works took place.

Due to the time constraints, installation of the equipment would have to take place throughout the night in eight hour shifts. With this in mind and to save time on transporting, Mabey created two temporary depots, one at Junction 15 (Beattock) and one near to Junction 13 (Abington) to deliver the BarrierGuard from.

Prior to the installation commencing on the carriageways, six artic vehicles were loaded with BarrierGuard 800 at each of the temporary depots, and dispatched as soon as the lane closures were put in place, allowing the installation to begin as early as possible.

Each articulated vehicle was quickly  unloaded and sent to the next temporary depot to be re-stocked, before delivering equipment to the opposite carriageway. This allowed a minimum of twelve loads to be installed on each carriageway per shift.

To make installation as efficient as possible, the number of Barriers on each vehicle was reduced to fifteen 12m units per load (the maximum capacity of a vehicle is eighteen), removing the need invert any Barrier units, making them easier to install and simplifying the process. To further increase the rate of installation, instead of using the traditional Hiab vehicles to lay the barriers, 35Te all-terrain cranes were used free-on-wheels.

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Solution

On each phase, the two installation teams started in the middle of the required run using a double-male unit, allowing them to work consecutively in opposite directions, and as a phase was completed the BarrierGuard was removed, again over-night in eight-hour shifts. Each of the first three phases required a total of approximately 6120m of BarrierGuard 800, with phase 4 increasing the total to 6912m.

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