Micropiles are sometimes called minipiles, and are a deep foundation element constructed using high-strength, small-diameter steel casing, and/or threaded bar.

Alternatively, a less than 300mm drilled and grouted reinforced pile may be installed.

Micropiles resist static and seismic loading conditions, and are often employed as an in-situ reinforcement for slope and excavation stability. They are also used for underpinning during the construction of foundations for a variety of projects including highways, bridges and transmission tower projects.

We use percussion rigs, flighted continuous bore micropile rigs, pendulum rigs, and bobtrax drilling rigs.

We find micropiles are especially useful in difficult or restricted access areas, or where environmental stability may be compromised.

CLL is very experienced in micropile installation, especially in tight access situations, where work is required behind buildings, on top of cliffs, down gullies or in basement areas.

“A lot of the micropiling that we do is in hard to reach places, with particular considerations to have to account for.

“This might be in built up areas where you can’t have much noise, where there’s limited headroom, a very small staging area, and you’re not allowed to create dust.

“At times we’ve had to remove a floor in an existing building to allow access for our rigs to install a foundation, and then reinstate the floor.

“Micropiles have their place in particular contexts, and particular challenges.

“At CLL we understand when they’re the best option from cost, time and tricky access challenges.

“As for any of our solutions and services though, we thoroughly understand our capabilities and what we can provide for our clients.

“We have the knowhow to know when and how to use different ground improvement techniques, including micropiles if that’s the best option.”

Jonny Walker