Precast piles are mainland Europe’s leading foundation choice and Aarsleff have been installing them in the UK for over 30 years. Supplied by sister company, Centrum Pile, our combined knowledge and expertise means we can deliver projects of almost any scope and size. We’ve answered eight of the most commonly asked questions about precast piles below.
Due to the possibility of carrying vertical and horizontal loads as well as bending moments, precast piles are used for the foundation of all sorts of engineering structures under virtually every soil condition. Piles can be a single section, or several sections can be jointed to provide longer piles for deeper ground conditions.
Piles can be provided in various sizes, formed in high strength concrete, with varying reinforcement. They are particularly useful where there is a need for very deep piles, typically up to 40 meters, in soft ground or in aggressive or contaminated soils.
The fundamental difference between a driven pile foundation and bored pile foundation lies in their point of manufacture. A driven pile is formed off-site under factory-controlled conditions and a bored pile is manufactured on site and in place.
Bored pile foundations, also known as replacement piles, are typically poured in place and provide support for structures, transferring their load to layers of soil or rock that have sufficient bearing capacity and suitable settlement characteristics. Driven piles are sometimes referred to as displacement piles because in the process of driving the pile into the ground, soil is moved radially as the pile shaft enters the ground. There may also be a component of movement of the soil in the vertical direction.
Curing precast concrete in the correct environment is essential to longevity of life. Aarsleff install Centrum Piles – cast in-house by our sister company, Centrum Pile. Centrum piles are cured in a factory coded to ISO 9001 and are all certified to BS EN 12794. Quality is of upmost importance and is monitored for every pile, with full traceability built into the Centrum Pile System. This quality assurance combined with Aarsleff’s delivery expertise means that you can be assured of the quality of your solution.
With the benefit of using pile joints, precast concrete piles can be driven to lengths longer than 30m. Often concrete precast piles can be driven down to 30m, however, in special circumstances, such as offshore projects, piles can be driven down to a maximum of 150m.
There is no established depth for foundations; nor is there a simple way of determining suitable depths. Instead, there is a very wide range of foundation types and depths suitable for different applications, depending on considerations, such as:
Shallow foundations are suitable at a depth of around <2.5 m, any deeper and you would need to look at a suitable piling solution. If the foundations are to be in close proximity to an adjacent structure, care must be taken to ensure the excavation works do not undermine it, nor is additional pressure exerted upon it. The foundation may need to be at least the same depth as the adjacent building’s foundation base.
Precast Piles are a versatile foundation solution, perfect for many needs across different sectors. Aarsleff’s commitment to delivering operational excellence in ground engineering means we are laser focused on creating value within your scheme. Contact us today to discuss your next project.
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