PILETEC'S PILING SERVICES

With decades of experience, Piletec Geotechnical Ltd delivers reliable and innovative piling solutions for projects of all sizes and complexities. Our expertise spans a wide range of advanced techniques, tailored to address the specific challenges of your site.

We specialise in:

– Continuous Flight Auger (CFA) Piling – Efficient, adaptable, and suitable for various soil conditions.

– Sectional Flight Auger (SFA) Piling – Perfect for restricted access or confined spaces.

– Rotary Open Bore Piling – Designed for challenging and variable terrains.

– Overburden Systems – Ideal for layered or obstructed ground conditions.

– Grundomat Piling – A versatile option for tight, complex environments.

Using cutting-edge equipment and precise execution, we ensure every project is completed safely, efficiently, and to the highest standards, building dependable foundations for lasting success.

TYPES OF PILING

Sectional Flight Auger

SFA piles are constructed by drilling a series of interconnected auger sections deep into the ground. To ensure stability during the process, the sides of the borehole are typically supported using temporary casing. Once the desired depth is reached, the augers are carefully withdrawn. Reinforcement is then installed, followed by the injection of cement grout or concrete from the base of the borehole. Finally, the temporary casing is systematically removed, leaving behind a secure and robust pile foundation.

Sectional flight auger

Continuous Flight Auger

CFA piles are constructed by drilling a continuous flight auger deep into the ground. Throughout the process, the sides of the borehole remain supported by the soil-filled auger itself, eliminating the need for temporary casing. Once the required depth is reached, sand-cement grout or concrete is pumped through the hollow stem of the auger as it is gradually withdrawn. Reinforcement is installed immediately after the auger’s removal, resulting in a stable and robust pile foundation.

CFA piles are formed by drilling a continuous flight auger into the ground. The sides of the hole are supported at all times by the soil-filled auger, eliminating the need for temporary casing. Upon reaching the required depth, sand-cement grout or concrete is pumped down the hollow stem as the auger is steadily withdrawn. Reinforcement is placed immediately after withdrawal of the auger.

Rotary Open Bored

450mm Rock Drilling

Low Headroom 450mm Contiguous Piled Wall

Rotary Open Bored Piles are reinforced concrete piles cast in holes drilled to predetermined depths using rotary drilling techniques. This method is one of the most economical piling solutions but is typically limited to specific ground conditions.

To ensure successful installation, the soil must be stable enough to retain the borehole’s shape during drilling and concrete placement. Rotary Open Bored Piles are less suitable for areas with groundwater unless effective dewatering can be carried out and concrete can be placed without requiring a permanent casing.

These piles are ideal for projects requiring a cost-effective and reliable foundation solution, provided the ground conditions align with the method’s requirements.

Pre-Drilled Driven

This method loosens the soil by means of boring a hole of sufficient diameter through the difficult soil layers into which the pile must be installed. Pre-drilling is usually carried out by auger drilling. Pre-drilling may also be required on sites where it is important to avoid noise and vibration. Mechanical augers have been used to bore uncased holes to receive piles which are installed in the hole and then driven a short distance to their required bearing level. This method would only be used where cast-in-situ piles are unsuitable because of ground or structural conditions.

A limitation of pre-drilling is that the bearing capacity of the pile may be reduced due to decompression. This aspect must be taken into consideration when the load carrying capacity of the pile is estimated.

Overburden Piling System

Odex Piling

The Odex Piling system utilises an eccentric under reamer to cut a drilled hole ahead of the bottom of the casing. The casing is then simultaneously advanced by a percussive force applied to bottom of the casing. As the hole is advanced, the drill cuttings are removed by air and travel up the inside of the casing in the annular space between the casing ID and the drill rod OD. The ODEX pile is highly effective in overburden soils where boulders or gravel layers are present, or when layers of rock must be penetrated. Generally the casing is removed once the pile reinforcement and concrete is placed. In some applications the casing is left in place while a rock socket is formed.

Super Jaws

A revolutionary new overburden system for simultaneously drilling and casing hole sizes 5-1/2″ to 42″ (139mm – 1067mm) in diameter.

Designed for top performance in both overburden and solid rock formations.

Large bit face area for transferring blow energy to the formation yielding faster penetration rates.

Uniquely designed bit wings extend out further than the casing O.D. when the bit reaches bottom to allow simultaneous drilling and casing.

The bit can be used to the full operating pressure of the hammer resulting in rapid penetration and minimum drilling time.

Bit wings retract inside the casing when the hammer is pulled off bottom. No reverse rotation, which can cause unscrewing, is required.

No ring bits or other drilling equipment is left down the hole.

Grundomat Pile

Grundomat driven piles are extremely flexible. There are various hammers that offer a range of sizes and are able to accommodate even some of the most restrictive and difficult access points. This means that engineers and construction companies can benefit from being able to install high quality piles without the need for overly costly installation techniques. They are also very accurate and offer low vibration rates which mean that there is minimal displacement and piles are placed exactly where required with no guess work.

The flexibility of Grundomat driven piles lies in the fact that they can be used where other pile driving solutions simply cannot. Restricted access needn’t be a problem and this means that driven piles can be added in extremely hard to reach situations while still only requiring a small pile driving team consisting of 2 people.

The minimal vibrations and low noise mean that they can even be used in residential areas for the construction of extensions and conservatories on residential properties. Grundomat piles are also widely used on the railway infrastructure

Hollow Bar Micro Piling

Micropiles can be installed in areas of restricted access or close to buildings. Due to the fully threaded system, the micropile can be extended and grouted in areas where the founding level is deeper than expected.

The rotary percussive drilling method ensures minimal disturbance is caused during installation compared to driven piling systems, enabling the foundations of old structures or buildings to be upgraded without damage. Pile stiffness can be increased by placing a steel tube over the top 2m of bar and grouting the annulus.

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Or call us on 01709 730873