Generally the choice between concrete bored piles and steel sheet piles or tubes is based on technical reasons; although where the lines between each technique are blurred, the primary reason may be cost.
Bored concrete piles offer excellent end bearing capacity, enhanced wall friction, a high degree of stiffness and can be constructed with a minimum of vibration. Concrete piles can be installed through hard ground layers. Piles of any size and length may be constructed on site. Correct design and construction will ensure a very long design life. Concrete piles can be used to provide simple embedded retaining walls, but the cost compared to that of a sheet piled wall is usually prohibitive.
Sheet piled walls can however offer load bearing capacity, as can driven steel tubes. Additional stiffness can be created by high modulus sheet piled walls. Vibration can also be avoided when driving sheet piles by pressing. Sheet piles can be installed in hard ground using specialist equipment.
The decision between choosing a concrete or steel piles solution is therefore not necessarily straightforward.
Our ability to offer a multi-disciplined approach to your project brief, whereby we can consider both concrete and steel sheet piles, means you can be assured our proposal is based on sound technical reasons whilst offering the most cost-effective solution.