DIRECTIONAL DRILLING - CASE HISTORY - Perco DRILLING - CASE HISTORY New Electric Cable Ducts from Perco Perco Engineering Services Ltd The Old Nurseries, Nottingham Road, Radcliffe-on-Trent ...

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  • DIRECTIONAL DRILLING - CASE HISTORY

    New Electric Cable Ducts from Perco

    Perco Engineering Services Ltd

    The Old Nurseries, Nottingham Road, Radcliffe-on-Trent, Nottingham, NG12 2DU Tel: 0115 933 5000 Fax: 0115 933 4692

    Email: info@perco.co.uk Web: www.perco.co.uk

    Perco were contacted to supply, weld & install an overhead and underground

    cable upgrade and a system reinforcement of an existing supply line

    in Wrexham, North Wales.

    The scheme involved:

    Drilling from within Legacy substation

    to an adjacent field under a large earth bund that surrounded the

    substation.

    Crossing the A5 to North Oswestry.

    Crossing under Whittington Lane and

    three 1200mm water supply lines.

    Each crossing would have three 225mm SDR11 and two 125mm SDR11

    ducts installed. Upon a site visit, Perco

    decided that the best method of installation would be via Horizontal

    Directional Drilling using their Vermeer D36x50 drill rig as it was compact in

    size, but still powerful enough to drill

    through the hard ground conditions.

    During, the works around the substation, extreme caution had to be

    taken as it was still live. The rig and the support lorry were kept as far away

    from the site as possible and a safety

    watcher was on duty at all times. The ground consisted of soft clay with the

    occasional boulder being encountered. Roughly 80mtrs of duct was installed

    during the first crossing which took 3

    days with great care being taken to

    ensure a clean bore.

    The second crossing provided sandy ground conditions and although the

    road was on a small embankment,

    Percos settlement calculations showed that one of the bundles of ducts had to

    be installed at too great a depth. The client agreed that three 225mm and

    two 125mm would be installed instead.

    The final crossing proved to be more

    difficult due to the ground conditions being very hard ground. The ducts had

    to be installed individually. For more information please contact

    Chris Brodie on 0115 9335000 or

    07866 043382.

    Scope: Horizontal Directional Drilling Project: Oswestry Substation, Wrexham Sub-Contractor: Perco Engineering Services

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