Electrical Contracting News (ECN) November 2016 - Page 24

PROJECT FOCUS A LANDMARK CROSSING The landmark Queensferry Crossing in Scotland promises to be one of the most efficient, high performance bridges ever built. Russell Drury takes a look at this impressive feet of engineering, as well as its cable management systems by Metsec. D ue to open in May 2017, the Queensferry Crossing forms the centrepiece of a major upgrade to the cross-Forth transport corridor in the east of Scotland. It will be the longest three tower, cable-stayed bridge in the world and represents a Scottish Government capital investment of more than £1.3bn. A major logistical challenge The 250-tonne steel bridge sections arrive in Rosyth docks from China, where they are then prefabricated to incorporate all of the services and road surfaces. The cable management systems supplied by Metsec are prefabricated into 424 modules by SES and then installed into each of the 110 finished 750-tonne road section decks before they are taken out by barge onto the River Forth and then lifted by crane to connect to the span between the bridge towers. All of the cable management products used had to be pre-approved by the construction contractors, the Forth Crossing Bridge Constructors Consortium (FCBC) which consists of Hochtief Solutions AG, American Bridge International, Dragados SA and Morrison Construction. Due to the extreme temperatures, thermal extension couplers for cable management were designed into the project with the support of the Metsec team to help compensate for the movement of the bridge due to temperature fluctuations, wind and traffic. Early stages of construction as the first deck is erected. 24 | November 2016 24-25 Project Focus.indd 24 11/10/2016 13:00