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The Concrete Times May 2015

The CONCRETE Times • MAY 2015 DIAMOND DRILLING, CUTTING & SAWING FEATURE C&P KEEPING THE TUBE ON TRACK WHEN THE 250 METRE LONG RUISLIP, LONDON TUBE DEPOT NEEDED AN UPGRADE, CASTLE & PRYOR were commissioned to drill 1500 holes TO FIX THE NEW track. 6 Handling over 4 million passenger journeys is all part of a days work for London Underground, whose rolling stock is maintained at their Ruislip depot, one of 15 depots in and around Greater London. When the 250 metre long depot required an upgrade to its track system and concrete hard standing, Castle & Pryor were commissioned by Clancy Docwra to drill 1500 holes in preparation for the track infrastructure. 1500 holes, one big challenge Each hole measured 30mm in diameter with a penetration of 210mm, for the resin anchor used to secure the track to the concrete. Due to the presence of the steel alloy rail tracks and rail anchors, it was not feasible to use the traditional approach of a diamond drilling rig with drill motor attached to a drill stand then bolted down via the drill stand base plate. Choice of methods Whilst there are other methods that can be used to TFL Ruislip Depot stabilise the drill stand, such as back propping or suction vacuum, Castle & Pryor opted to use hand-held methodology. This allowed maximum control and precision to drill between the tracks, as well as significantly speeding up the drilling, as there was no need to move the stand from hole to hole. Free hand drilling Free hand drilling requires the highest levels of training and expertise in order to drill with a high degree of accuracy and precision and also increases the risk of Track joint


The Concrete Times May 2015
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