Specialist Drilling & Anchoring

We have excavator mounted drilling rigs ideal for slope stabilisation works ranging from four tonne through to twenty five tonne fitted with both rotary and rotary percussion drifters.

These drilling rigs have the ability to reach up 9 metres or down to 6 metres below the machine. When access is limited our hydraulic slide drills can be mounted onto scaffolding or elevated work platforms to complete the drilling task. Our drill range also includes hydraulic crawler drill rigs which can drill and case large diameter holes in any material.

Tensioned Anchors

Tensioned Anchors also known as ground anchors are most commonly used in bridge construction, pile walls and dams. They are made from either a steel reinforced bar (rebar) or single strand or multiple cables depending on the load applied. Warner Company has installed many of these anchors in temporary and permanent situations and have the capabilities to apply loads up to 3,000kn.

Soil Nails

Soil Nailing is a common method used to prevent landslips by installing steel reinforced bars into drilled holes and anchoring them to the soil strata by grouting. Soil nails are most commonly used in steep cut batters. Often steel reinforcing mesh is fixed to the bars and then shotcrete is applied. Warner Company has all resources to complete these works in house.

Rock Bolts

Rock Bolts are used to anchor a rock formation to the parent rock mass. The rock that is at risk of falling is drilled, continuing into a solid rock formation. A steel bar, cable or fibreglass bolt is then installed into the hole and fixed with either chemical resin or a cement grout. A bearing plate is then installed and the bolt is tensioned. Rock Bolts are also used in Rockfall Protection Netting Systems (RPNS) on unstable cuttings to tension the netting to the rock. Warner Company has a variety of drills to install rock bolts. Top hammer drills are used most often because of their efficiency. If access is difficult, hydraulic slide drills can be utilised from scaffolding, an EWP basket or onto a small excavator. In other cases Warner Company has installed rock bolts with held equipment from ropes.

Mini-Piles

Mini-piles are small diameter drilled and grouted friction piles generally ranging from 150mm to 350mm in diameter. Warner Company has used mini-piles as an economical alternative to large diameter drilled shaft foundations. Mini-piles can replace conventional piles where there is limited or difficult access or work area due to existing structures such as overhead power, bridges or buildings. Warner Company has several rigs we can use for mini-piles depending on requirements.

Horizontal Drains

Warner Company has installed horizontal drains into existing cuttings and batters, soil nail walls and highwalls. We have installed drains up to 70m long. A horizontal drain is a hole that is usually drilled just above horizontal to the required depth, then a slotted pipe is installed to allow water to enter the pipe and flow to the outlet at the batter face. The main reason to install drains is to relieve hydrostatic pressure which can cause major landslips and rockfalls.

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