Special Drilling Projects

Necessity is the Mother of Invention

When South West Water came to us with the problem of installing a 10″ sewage outfall through a hole drilled from the top of a 300′ cliff in Cornwall to a target of one metre below Mean Low water springs we knew we had a challenge on our hands.

A previous attempt by another company to drill the hole in one pass had failed after some 3 months of effort.

We decided that a pilot hole would have to be drilled using diamond drilling methods to ensure accuracy and this hole (56mm in diameter) could then be reamed out to the required diameter (12″) using a DTH drill.

The Diamond drill hole had to be continuously surveyed and wedged to guide it into position.

The drilling challenge was successfully met and the outfall now serves the Perranporth area in Cornwall.

A similar drilling method was also used to install an outfall at Mevagissey in Cornwall and was also highly successful.

If you have a problem involving drilling speak to the people who can tailor a solution to meet your needs.

Previous projects have included:

The installation of Piezometers in an Earthfill dam at the Wheal Jane Mine Site in Cornwall For the Environment Agency by DTH drilling.
The drilling of blast holes on the sea bed in Pembroke Dock, West Wales for Seacore from their Jack up rig.
Pressure relief drilling in the Victorian dams of the Elan valley in Mid Wales for Severn Trent Water and the Burrrator and Roadford Dams in Devon for South West Water.

Recent Projects

Rock Anchoring Contract Completed in Launceston for CORMAC

Carnon Contracting have successfully completed a bolting and meshing contract for Cormac at a site near Launceston in Cornwall, UK. The works included the installation of solid bar rock anchors and rockfall mesh to mitigate the risk to site workers from potential rockfalls[...]

Polzeath Cornwall:- Soil Nailing, Shotcreting (Guniting) and Ground Anchoring

Carnon Contracting have recently completed a scheme to stabilise the face of an excavation for a new Ecohouse in Polzeath in Cornwall. The rocks comprised the installation of Soil Nails and Rock Anchors and the construction of a reinforced sprayed[...]

Ground Source Heat Boreholes, Mullion, Cornwall

Carnon Contracting have completed drilling boreholes for several Ground Source Heat Pumps in Mullion in Cornwall. A total of 12 no. 100m boreholes were drilled on behalf of ROK. The loops and Grout were all supplied and installed by[...]

Ground Anchor/ Soil Nailing Contract Completed

Carnon Contracting have completed a Ground Anchor/ Soil Nailing contract in Cornwall. It comprised the installation of Stainless UK Grip bar anchors/Solid Nails and piles to remediate a failed retaining wall in Falmouth. The site had access issues and the drilling[...]

Newquay Airport Site Investigation

Carnon Contracting and Crofty Consultancy have jointly completed an Environmental drilling project at Newquay Airport in Cornwall UK. The works included the installation of sampling holes for the monitoring of groundwater. The[...]

Ground Source Heat Pump Boreholes, Somerset.

Carnon Contracting have drilled and installed seven Ground Source Heat Pump Boreholes at a site in Somerset.The works included the installation of the ground loops and the grouting of the system with Thermally[...]

Ischebeck Titan Soil Nails and Shotcrete installed at Penlee Quarry

Carnon Contracting have completed a project to stabilise a slope at Penlee Quarry near Newlyn in Cornwall. The works entailed the installation of 9 grouted Ischebeck Titan Soil Nails and the stabilisation of the slope using sprayed concrete, Shotcrete. The client[...]

Mini Piling for Foundations.

Carnon Contracting have recently completed several small mini piling contracts for private customers and small developers throughout Devon and Cornwall. Mini Piling quite often provides a cost effective alternative to deep concrete foundations and avoids the requirement to take large[...]

Site Investigation on the A30 in Cornwall

Carnon Contracting have carried out a Site Investigation adjacent to the slip road of the A30 at Tolvaddon for Card Geotechnics. The works included rotary drilling and the gathering of data from Standard Penetration Testing.[...]

Tywarnhale Mine Adit Works

Carnon Contracting have completed a contract to carry out underground safety works at Tywarnhale Mine near Porthtowan for its owners, Imperial College of Science and Technology. The works comprised the blocking of of an old stope access to maintain access through[...]

Site Investigation Drilling in Cornwall

Carnon Contracting have completed a site investigation drilling contract for Aquasource at a site on the North Coast of Cornwall . The contract involved the drilling and casing of holes into the side of an abandoned[...]

Rock Anchoring Complete

Carnon Contracting have completed a significant contract to install 48 Double Corrosion Protected rock Anchors at a development site near Lynton in Devon. The client was Hoveman Developments and the materials will be supplied by DYWIDAG. The rock anchoring phase of[...]

Slope Stabilisation in Mylor

Rock Bolting and Underpinning Carnon Contracting were contracted to carry out emergency works when a slope failed at the base of a garden in Mylor, Cornwall. After stabilising the angle of the slope a comprehensive scheme of works was designed by[...]

Rock Bolting in Newlyn

Retaining Wall Repair Carnon Contracting have recently completed a Rock Bolting contract as part of a project to rebuild a failing retaining wall at Chywoone Hill, Newlyn in Cornwall. The access to the site was extremely awkward with all equipment being[...]

Rock Bolting and Slope Stabilisation in Looe

Carnon Contracting have recently undertaken the installation of Rock Anchors and Mesh at a site at Hannafore Road in Looe, Cornwall. The main contractors were Collards Constructions and the works comprised the installation of circa 30 rock anchors, plates and[...]

Piling in Carbis Bay

Carnon have completed a contract to install 53 Rock Socketed mini piles for a project in Carbis Bay in Cornwall. The project was carried out for a private client who is constructing a modern thermally efficient timber frame structure supplied[...]

Soil Nailing in Feock

Carnon Contracting have completed a significant contract in Feock in Cornwall comprising the installation of Self Drilling Anchors and mesh to stabilise a cliff face that had partially collapsed. The works included the drilling of 80 Self drilling anchors, mesh[...]

Roskear Shaft Refurbishment

Mine Shaft Refurbishment Carnon Contracting have completed the installation of a new ladderway and ventilation system to Roskear Shaft, Camborne, Cornwall for the Environment Agency. This enables personnel to access the adit drainage level safely without the use of specialised cranes. This project also included the installation of[...]

Site Investigation Drilling from a Pier in Alderney

Carnon Contracting were approached in 2005 to devise a method of obtaining Core Samples from the base of the Quay at Braye Harbour on Alderney in the Channel Islands. Carnon Contracting drew up a drilling approach involving[...]