What are Bored Piles?

by | Jul 27, 2021

Piles are foundations that are drilled/bored into the ground in order to offer greater structural strength in weak soil conditions. Some soil is strong, and can carry heavy loads without too much difficulty. Other soil types, however, would fail structurally were you to try and construct on top of them without additional support. Piles provide this kind of support. In this post, the team here at Borehole Solutions, who offer piling and geotechnical solutions, wanted to look at bored piles, in particular.


How do Bored Piles Differ from Other Piles?

There are several different types of piling, including sheet, driven, screw and micro piling. Bored piles, however, differ in that they’re cast in-situ. What do we mean by this? Well, unlike driven and screw piling, in which the piles are inserted into the ground, with bored piles, the piles are essentially made within the borehole. A borehole is augured into the ground, into which cement/concrete is poured and left to set.

They’re also known as replacement piles because the concrete poured in replaces the soil taken out whilst the borehole is being bored. These aren’t to be confused with displacement piles (like driven and screw piling) where the soil is forced to the side, or, displaced. Bored piles are ideal for urban environments as they cause minimum disturbance and vibration, and can be installed in relatively restricted conditions, particularly in conjunction with the use of certain drilling rigs.

They can either be installed using percussion or rotary drilling, making them an incredibly versatile and accessible option for construction projects. Whether or not the borehole requires lining prior to concrete is poured depends on various certain factors, such as the water table height, for instance. Where collapsible conditions might be experienced (in deeper boreholes, for instance) then instead of concrete, a vinyl polymer fluid is often used, instead


How Deep are Bored Piles?

The depth of bored piles can vary, and depends on the kind of construction that’s going to take place overhead. For the most challenging of soil conditions/the heftiest of constructions, though, piles of up to 60 metres can be drilled. In terms of diameter, again it varies, but it (usually) ranges from 300mm to 2800mm.


Are Bored Piles Expensive?

Although a highly effective, reliable and trusted piling option, the on-site processes required mean that it does tend to be amongst the more expensive piling choices. That said, you pay for quality, and what you’re getting is a foundation you know will stand the test of time, even in the most trying of situations and settings.


Contact Us

So, if you’d like to find out more about our piling and geotechnical solutions, then get in touch! Contact Borehole Solutions today on 01733 200 501 or by emailing us at info@boreholesolutions.com. Alternatively, you can fill out one of our online enquiry forms and we’ll get back to you as quickly as possible. However you wish to get in touch, we look forward to hearing from you!