With the walls of this old quarry forming the backdrop to what will be the back gardens of a new housing scheme, the property developer needed to ensure that the tenants would be safe in their own homes from the risk of any falling rocks.
CAN designed and installed the whole solution which comprised 300 rock bolts to anchor specific rock features in place, 4000m2 of Maccaferri mesh and 52 tonnes of shotcreting to particularly fragmented areas.
Owing to the coastal environment, head plates were powder coated for additional corrosion protection and coloured in such a way that they blended into the rock face.
Prior to the main works intensive devegetation, rock scaling and reprofiling works were carried out both by hand using rope access and MEWP’s, along with a long-reach excavator fitted with a breaker.
The topography above the quarry meant that mechanised plant was unable to access the crest line. CAN’s solution was to lower traditional A-Frame drilling rigs from the crest line to install rock bolts to the upper third of the face. This was done using our 17m reach telehandler with drill basket that was able to reach and install bolts to the lower two thirds from the quarry floor.
Duration: 12 weeks
Client: Cavanna Homes
Location: Oreston, near Plymouth