How Does Precast Pile Manufacturer Work?

Driven piles are deep foundation elements installed using impact or vibration hammers to a design depth or resistance.

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Common uses

Can be used for all types of construction, particularly in aggressive soil conditions Well suited to sites where the ground conditions are highly variable as they are driven to a set or pre-determined resistance A good foundation choice when you have very thick layers of soft soil and/or a high water table that would be problematic for a traditional drilled pile Small piles sizes can be used for: underpinning houses and light buildings, limited headroom, difficult access Medium pile sizes can be used for: foundations for new buildings, infrastructure, floor slabs and load transfer platforms, lateral support for earth retention in conjunction with king post walls Large pile sizes can be used for: wind turbines and pylons, river bridge foundations, bridge abutments and piers, marine construction

Process

Driven piles can be made of timber, pre-cast concrete, steel H-piles, steel sheet piles, or pipe piles. In some cases, pre-drilling may be necessary in dense soil to allow the pile to reach design depth. They can be installed in one length or jointed for deeper piles.

Advantages

Widely used and suited to most ground conditions Extensive range of pile sizes Piles are pre-manufactured to factory standards, the required length and standard conformity Piles may be installed to significant depths > 80m No spoil so often the most cost effective heavy foundation solution for contaminated or brownfield sites Unaffected by ground water Rapid follow-on construction

Quality assurance

Keller has access to an extensive selection of pile sizes to ensure an optimum design solution and can draw on extensive experience and resources to ensure successful project delivery.

We also use the most up-to-date, enclosed hydraulic hammers, which keep noise disturbance to a minimum.

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.

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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.

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:

• The nature of the load requiring support
• Ground conditions
• The presence of water
• Space availability
• Accessibility
• Sensitivity to noise and vibration

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.

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