NORTHERN Irish contractor Earney Contracts has been using a Schaeff WS-60 Cutting Unit to cut trenches in rock more efficiently and quietly than conventional breakers can.
The contractor is using the 850 mm-wide unit fitted to a 20 tonne Cat 320BL excavator to cut through the asphalt at an average rate of 70 m/day for a 1.5 m-deep pipeline being laid in the Ballynahinch to Crossgar road in County Down.
'The cutter produces a type one backfill, is very accurate and allows us to trim if necessary, to produce a very neat, level-bottomed flat-sided trench, ' said foreman Andrew Earney.
'If we had used a breaker, we would have had to take out twice as much material, which we couldn't then reuse. The Schaeff machine also leaves a jagged edge to the asphalt at the top of the trench, which gives a better bond to the new overlay.'