Geotechnical Drilling and Anchor Installation
The type of drilling equipment the Vector team uses to perform the work will
depend upon the specific requirements of the project.
Drilling rigs are machines that are used to create holes in the ground. They vary in size and capabilities, from hand held pneumatic drills to rigs that are attached to a machine or hung on the cliff /slope using cables and operated using rope access techniques.
In rock drilling, the hole is usually not made through a circular cutting motion, though the bit is usually rotated. Instead, the hole is usually made by hammering a drill bit into the hole with quickly repeated short movements. The hammering action can be performed from outside the hole (top-hammer drill) or within the
hole (down-the-hole drill, DTH). Drills used for horizontal drilling are called drifter drills.
Hand drilling using pneumatic rock drills
This method is used on hard to access slopes/cliffs and where small diameter, short length rock anchors or soil nails are required. This method requires two Vector operatives with extensive knowledge in the use of hand held rock drills. The Drill is positioned between the two rope access operatives on a seperate line
and moved hole to hole by hand. A relatively quick and cheap method of anchor installation.
All our hand held rock drills are fitted with anti vibration handles.
DTH ( Down the hole) Rig
This method requires the drill to be mounted on a frame and either suspended using cables or attached to a tracked or wheeled machine. DTH drilling can be performed in most types of rock, hard or soft. In DTH drilling,
the drill string rotates while the drilling hammer continuously strikes down into the rock.
A down-the-hole drill, usually called DTH by most professionals, is basically a mini jackhammer screwed on to the bottom of a drill string. The fast hammer action breaks hard rock into small flakes and dust and is blown clear by the air exhaust from the DTH hammer. The solid bar is then installed and grouted into place using a separate grout line. This type of drill is more suited to solid rock and for large diameter holes.
Top hammer drill rig
The Top hammer rig is mounted in the same way as a DTH rig, either by a frame or onto a tracked or wheeled machine.
A top hammer drill rig mainly used for the installation of soil nails as the hammer action takes place from outside the hole. It can also be used to install solid rock anchors by open hole drilling but only on good ground.
Soil nails are a cost-effective method for long- or short-term stabilisation of steep existing or proposed slopes. The stability of the slope is increased with the installation of steel or glass fibre threaded soil nails. The end results ,along with the correct drainage, significantly reduce the chances of a landslide or other ground movements. This type of drill is more suited to soil or fractured ground where the integrity of the hole is compromised and only a sacrificial anchor could be installed.
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