Plate 5.3: Typical tractor and trailer set up for cable drum transportation 6
5.6.3.2 Installation of cables into ducts 338. Jointing pit locations for subsequent phases may not correspond to the locations specified for East Anglia ONE as different cable technology may be available at that time or an alternative supplier could be used. When the jointing pit locations have been determined each would be excavated, the pre-installed ducts exposed and a lightly reinforced concrete slab would be cast for the base of the jointing pit.
339. The cable drum would be delivered to one of the jointing pits and a cable pulling system would be installed into the trench. As with the direct lay this may comprise a steel bond and winching system with free spinning cable rollers placed along the bottom of the trench.
340. Once on site, the cable drum would be raised off the ground on hydraulic jacks to enable it to spin freely when pulled. The cable would then be pulled from the drum into the trench using the pre-installed rollers, with sufficient cable pulled through to the far jointing pit to allow for jointing onto the next section. The process would be repeated for the second cable to be installed in the duct.
341. The main variation for installing cables in pre-installed ducts as opposed to open trenches is that cable pulling in ducts relies on the use of biodegradable water based lubricant during the pulling process.
Source: Photo courtesy of Prysmian Group. This photo is representative of works that will be undertaken for the proposed East Anglia THREE
project.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 5 Description of the Development Page 75
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