Driven Piling: How Driven Piles Work and When to Use Them

Driven piling is the installation of preformed piles — concrete, steel or timber — by forcing them into the ground with a hammer, vibrator or hydraulic jack, rather than excavating a hole and casting the pile in place. Because the pile pushes the soil aside instead of removing it, driven piles are known as displacement piles. They are one of the oldest foundation techniques and remain one of the most efficient where ground conditions and surroundings allow, giving a pile whose quality is controlled in the factory and whose capacity can be checked as it goes in.

This article explains the types of driven piles, how they are installed and verified, the effects they have on the ground and neighbours, and how an engineer decides whether driven piling suits a particular site. For the wider family of pile foundations, see our overview of pile foundation types.

Types of driven piles

Precast reinforced concrete piles

Square or polygonal concrete piles cast in a yard, cured and transported to site. They are robust and economical for moderate loads. Their length is limited by transport and handling, so longer piles are made by joining segments with welded or mechanical splices during driving.

Spun prestressed concrete piles

Hollow circular piles manufactured by spinning concrete in a mould and prestressing it. The prestress helps the pile resist tension and cracking during handling and driving. Spun piles are widely used for building foundations in the region and are commonly installed by jacking or hammering in jointed segments.

Steel H-piles and tubular piles

Steel piles tolerate hard driving well, can be spliced easily to any length and penetrate dense layers that would damage concrete. H-piles displace relatively little soil; open-ended tubes may form a soil plug. Corrosion allowance or protection must be considered for permanent works, particularly in aggressive ground or marine conditions.

Timber piles

Historically common and still used in some parts of the world, timber piles are now rare in modern building work. Their durability depends on staying permanently below the water table.

How driven piles are installed

Installation methods fall into four groups:

Drop hammers — a heavy weight lifted and released onto the pile head. Simple but slow.
Hydraulic and diesel impact hammers — more controlled and efficient, delivering a measured energy per blow.
Vibratory drivers — clamp to the pile and vibrate it into the ground, effective in granular soils and commonly used for steel sections.
Hydraulic jacking (press-in) — a rig that pushes the pile into the ground using its own weight and counterweight, without impact.

Jacked piling deserves special mention in a dense city. Because it avoids repeated impact, it produces far less noise and vibration than hammering, which is why jack-in spun or square concrete piles are frequently used for buildings in built-up areas. The jacking force also gives a direct reading of resistance during installation. The equipment itself is discussed in our article on the piling machine.

Whatever the method, the pile is driven in segments, with joints made to a specified standard, until it reaches a target depth, a target resistance, or both.

Verifying capacity: set, refusal and testing

One of driven piling’s great advantages is that every pile is, in effect, partly tested as it is installed. For impact driving, the set — the penetration per blow, or per set of blows, near the end of driving — gives an indication of the resistance the pile has mobilised. The engineer specifies termination criteria based on design capacity, ground conditions and the hammer used, and the piling records show whether each pile met them. For jacked piles, the final jacking force and the period it is held provide a comparable check.

Driving resistance alone is not proof of long-term capacity. Some soils gain strength after driving as excess pore water pressure dissipates (set-up), while others lose resistance (relaxation). Capacity is therefore confirmed by testing a proportion of piles:

Static load tests — loading a pile with kentledge or reaction piles and measuring settlement; the most direct method.
High-strain dynamic testing — instrumenting the pile during a hammer blow and analysing the stress waves to estimate capacity and check pile integrity.
Integrity testing — low-strain methods to identify damage or defects along the pile.

Good practice combines driving records, dynamic tests and a smaller number of static tests to build confidence across the whole pile group.

What driven piling does to the ground

Because driven piles displace soil, they change the ground around them. In loose granular soils, driving densifies the soil, which can increase capacity. In soft clays, displacement creates excess pore pressure and can cause heave at the surface and uplift or lateral movement of piles already installed nearby. Pile sequencing — driving from the centre of a group outward, for example — and monitoring of previously installed piles are standard controls.

Soft marine clay, present across parts of Singapore and especially beneath reclaimed and low-lying land, raises a further issue. As the clay consolidates under fill or groundwater changes, it settles and drags down on piles passing through it, adding load through negative skin friction. The pile design must allow for this. Hard layers, boulders and the variability of residual soils over weathered rock can also cause piles to refuse early, deflect or break, which is why a thorough site investigation is the starting point for any driven pile design.

Noise, vibration and neighbours

Impact driving is loud and generates ground vibration that can be felt in neighbouring buildings. In Singapore, construction noise is controlled by NEA under the Environmental Protection and Management Act, with permissible noise levels and restrictions on working hours for sites near residential and other noise-sensitive premises. On a constrained urban site, those limits, together with the risk of vibration affecting old or sensitive structures nearby, often rule out conventional hammering.

The usual responses are to choose jacked piles, to use bored piles instead, or to manage impact driving carefully with condition surveys of neighbouring buildings, vibration monitoring and agreed trigger levels. Vibratory driving reduces impact noise but can still transmit vibration and may cause settlement in loose sands.

Choosing driven piles versus bored piles

The choice between displacement and replacement piles is rarely about one being better. It depends on loads, ground, site constraints and programme.

Driven piles suit sites with soils that can be penetrated, moderate to high loads distributed over many piles, a desire for factory-controlled pile quality, and situations where spoil disposal or groundwater would complicate excavation.
Bored piles suit very heavy column loads, sites with hard layers or boulders that would stop a driven pile, sockets into rock, and locations where vibration and noise must be minimised.

Our article on bored piles covers the alternative in detail. Load from the piles is gathered and transferred to the structure through the pile cap, discussed in our guide to the pile cap. In Singapore, pile design forms part of the structural plans prepared and endorsed by a Professional Engineer and submitted for approval, with installation supervised and recorded under the building control framework.

Frequently asked questions

What is the difference between driven piling and bored piling?

Driven piling forces a preformed pile into the ground, displacing soil sideways. Bored piling excavates a hole, removes the soil and casts a concrete pile in place. Driven piles offer factory-controlled quality and a measure of resistance during installation; bored piles suit very heavy loads, hard ground and sites sensitive to vibration.

Is driven piling allowed in Singapore?

Yes, driven and jacked piles are used in Singapore, subject to the structural design approved under the building control framework and NEA’s controls on construction noise. On sites close to homes or sensitive buildings, jacked piles or bored piles are often chosen to keep noise and vibration within limits.

How do engineers know a driven pile is strong enough?

They combine installation records — the set per blow for hammered piles, or the final jacking force for jacked piles — with testing of a proportion of piles, such as high-strain dynamic tests and static load tests. Together these confirm that the piles achieve the required capacity.

Can driven piling damage neighbouring buildings?

Impact driving generates vibration and, in soft clays, ground heave or movement that can affect nearby structures if not controlled. Condition surveys before work starts, vibration monitoring, careful sequencing and choosing low-vibration methods such as jacking reduce the risk.

Choosing between driven, jacked and bored piles for a constrained site? Talk to our consultancy or get in touch.