PROJECT – Substation Demolition
LOCATION – Sighthill, Edinburgh
DATE – August to November 2016
PROJECT VALUE – £350,000
PROJECT DESCRIPTION – Working for a new Client, BDB Dismantling have recently completed the demolition of a 275kV substation to include dismantling and removal from site of 2no 150ton transformers and 100ton shunt reactor. This was carried out following the removal of all associated oil into tankers, which was sampled beforehand and confirmed PCB free.
A strategy was implemented to keep on site work to a minimum thus reducing hazards and risks to project personnel; Heavy road haulage was used to collect the transformers/shunt reactor in full units and transport to a nearby recycling facility for further processing. This also helped to shorten the programme.
Following removal of ancillary equipment, each 150ton transformer was raised approximately 1000mm using 4no 100ton hydraulic jacks. The transformer was raised up to 1000mm at 150mm intervals with timber sleepers/packing material inserted at each interval to take up the weight of the transformer. Under watchful eye of banksmen at the sides & rear, the trailer was reversed directly below the transformer, which was then lowered onto the trailer bed, secured and removed from site.
Two 15meter post insulators, that were located approximately 3 meters from live equipment were demolished during outages, when the live equipment was temporarily isolated. This was carefully programmed with the Scottish Power team to ensure the outage dates were met. 7meter high timber protective shrouds were constructed under temporary works design and used to protect the new equipment during demolition.
A remediation strategy was implemented for the area of ground contamination. This included removal into transport and disposal off site of the material under SEPA consignment. The void and other excavations on site, following removal of slabs and bases, were backfilled using highways agency specifications.
Other work carried out on site included; asbestos abatement; removal of 24 control cabinets within the switch room building & associated cable; removal of bushings and associated reinforced concrete post insulators; removal of approx. 200 l/m concrete trench covers and replace with new GRP covers; fabrication and installation of a new security barrier.
