Contractors World

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Contractors World - 2015 Vol 5 No 2

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First Bridge Is Completed

Video footage showing the construction of the first major structure as part of the £500m M8 M73 M74 Motorway Improvements Project has been released by Transport Scotland.


The completion of the Braehead Rail Bridge marks a significant milestone in the progress of the M8 M73 M74 Motorway Improvements Project. The contractor responsible for delivering the project, and its construction joint venture, was Ferrovial Lagan.

The time lapse footage reveals the new rail bridge, weighing in excess of 2,000 tonnes, sliding into its final position over what will become the new M8 motorway, to join the existing Cutty Sark rail bridge at Bargeddie, Glasgow.

The first phase of works involved the closure of the railway line over four weekends in April 2015, allowing the construction team to lay the foundations by installing eight piles (each two metres in diameter) and reinforce the ground on either side of the bridge. The three-span steel bridge was then built adjacent to the existing railway prior to the slide.

The new bridge will carry the Rutherglen and Whifflet rail line over the new M8, which is currently being constructed to the south of the existing A8.

Dario Saavedra, construction manager for Ferrovial Lagan Joint Venture, said:

The operation included the removal of the existing railway infrastructure including overhead lines, rail tracks and the embankment, before the steel and concrete bridge could be pushed into its final position over the precast piers to carry the weight of the structure.

The construction team used a Self-Propelled Modular Transporter (SPMT) system to slide the 2,000 tonne structure into place.

A computer controller was used to simultaneously drive the six SPMT platforms carrying the bridge structure 50 metres north, in an operation that lasted approximately four hours.

Gavin McKevitt, Regional Director Scotland and Northern England, Lagan Construction Group, said:

The bridge push has been the culmination of many months of intricate planning, detailed engineering, and consultation with all the key stakeholders and is a credit to the teams involved. It's successful completion demonstrates the level of engineering excellence on this scheme and we are delighted that the first major milestone has been achieved.


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