Screw Piles in Cohesionless Soils

Screw Piles in Cohesionless Soils

Screw piles are a modern alternative to traditional foundation methods, offering structural resistance against tensile and compressive loads. Their ability to be installed in tight or restricted access areas enables construction timelines to be streamlined and costs to be reduced. As well as this, screw piling construction is ideal for sites with environmental laws, such as those requiring tree-protected zones to be adhered to.

Due to their design, screw piles have a low impact on the soil environment where installation occurs. This is largely due to their low shaft friction and small size measurements, which minimize disruption of the underlying soil layers. This, combined with their versatility and ability to support a wide range of building projects, makes them an excellent option for many applications.

The use of screw piles can also be beneficial when working on existing structures. This is because, unlike traditional foundations, they can be installed without affecting the surrounding structure or disrupting its function. Additionally, their helical flights and rock tips allow them to penetrate into the ground without damaging or disrupting surface materials.

Although there is considerable evidence supporting the performance of screw piles, it is important to note that a comprehensive site investigation is essential before starting any project. This includes conducting a geotechnical analysis to assess the soil composition and determine its bearing capacity. This will then allow the design team to develop an appropriate screw pile configuration and determine the required installation depth.

Screw piles can be used in a variety of construction projects, including homes, commercial buildings, bridges, and roads. They can also be used in various ground conditions, including clayey, sandy, or waterlogged soils and gravelly or rocky soils. They are particularly suited for sites with restricted or difficult access, as they can be installed by hand without the need for heavy machinery and extended setup times.

The ultimate capacity of a screw pile in both compression and tension is dependent on the end-bearing resistance, helix plate bearing, and shaft-soil friction. This can be influenced by soil conditions and installation processes, such as predrilling, which can result in a reduction in the shaft capacity.

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