Excavation and Groundwork

Drilled piles (also known as drilled piers) are a kind of pile wall made using the stabilator system. Drilled piles are of high technical quality and are a durable, long lasting solution. They can be assembled quickly and effectively without the need for vibrating or pneumatic machinery.

There are several different kinds of drilled piles which can be used to construct properties. To help you find the right one we have provided the following information on different drilled pile methods.

Rotary boring is a method which can be used to create larger diameter piles than other piling methods. Rotary piling can also be used through tough strata. Depending on the natural features of a worksite different rotary boring techniques can be used.

• Dry Boring Techniques are effective for use on ground with dry conditions. When using this method the pile is sealed in a temporary casing to protect the bore from any moisture or unstable layers of earth. When the bore reaches the desired depth a cage structure is introduced to stabilize the bore and concrete is poured. The concrete helps the bore to rise to the correct level where it is stabilised. The casing can be left on or removed as desired.
• Wet Boring Techniques are used on ground that is sodden but still stable. Wet boring methods also involve a temporary casing to protect the bore against moisture. The bore is then positioned using a digging bucket to reach through the layers of strata to the desired depth. Similar to dry boring techniques a cage is positioned around the bore and concrete is poured in. In this method removing the temporary casing is also optional.

Under reamed piles are extremely durable constructions which can support high load bearing capacities. This as they have mechanically assembled enlarged bases which come in a variety of sizes up to just over 6cm in diameter.

Under reamed piles are formed in inverted cone shapes with a sloping surface set at 55° horizontally. Under reamed piles are more limited than other piling methods as they can only be used in firm soils.

Auger cast piles are a versatile solution for most construction sites. They cause very little noise pollution while the pile is being formed which makes them well suited for residential or industrial sites. They are also a versatile solution to use with bearing piles and excavation support.

Auger Cast Piles don’t require any form of casing and are formed by drilling through the ground using a flight auger. When the correct depth is reached a concrete mixture is pumped down the auger. As the concrete is being poured the auger is slowly removed leaving a solid column of concrete up to ground level.