D-Drill at work in the Cambrian mountains
We were asked to form two trenches in the floor slab of the slip way, total length 9m long x 650mm wide x 300mm deep, for new pipe work to be put in place and to form a 450mm wide 175mm high slot x 1.6m deep through the bund wall, after the concrete was removed from the trench for the pipes to go through.
We then needed to diamond drill a 175mm dia hole into the dam wall for pipe work to be fitted. The overall depth was 2m 750mm. Kaymac Marine had placed a limpet dam in the main reservoir that was bolted on the wall and then the water was pumped out so we could drill right through.
We used a hilti 3 phase wall saw for cutting the trench, power was supplied by a 3 phase generator which Kaymac had hired. We used a weka dk32 for drilling through the bund wall and a Dimas hydraulic motor for drilling through the reservoir wall, due to the depth.