Displacement piling is a technique performed without soil removal. Commonly, displacement piles are used for foundations that provide support for structures from housing to commercial and industrial buildings. At Roger Bullivant we have a range of different displacement piling techniques including Driven Precast Concrete Piles, Driven Tubular Steel Piles, RB Combipile, Cast Insitu CHD Piles, CHAD Piles, and CDA Piles.
What are the different types of displacement piling?
- Driven Displacement Piles
Driven Displacement Piles can be precast or steel. and the piles themselves are manufactured off-site and driven on site. Our precast piles are designed and manufactured in-house in varying segmental lengths to reach required depths, and our steel piles are commonly sourced from a recycled oil pipeline.
- Auger Displacement Piles
Auger Displacement Piling is a wet concrete technique where the specialist drilling tool displaces the soil laterally during penetration of the soil to the required pile depth. The tool is then extracted while concrete is pumped through the hollow stem to the base of the tool.
Displacement Piling Solutions
Driven Precast Concrete Piles are the most versatile, cost-effective deep foundation solution, suitable for most ground conditions including contaminated ground. This technique is designed and manufactured in-house in varying segmental lengths that are combined to reach required depths.
Driven Precast Concrete Piles are used for many types of structures providing foundations for residential, commercial, and industrial buildings through to art installations and features. Driven piles can also be used for a variety of civil engineering applications from bridges to embankment support, power and transmission towers and rail-related structures. This method often represents the most-cost effective deep foundation solution, being quick and clean to install, and may also be adopted where the prevailing ground and groundwater conditions may preclude the use of bored cast-in-situ pile, for example in very soft soils or where artesian groundwater is present.
This technique is often used as an alternative method to Driven Precast Concrete Piles where difficult ground conditions are present including hard driving conditions or where some types of obstructions are present. At Roger Bullivant we can install a combination of precast and steel tube piles on a project, to achieve a wider range of pile load combinations to meet your requirements where driven tubular steel piles are the preferred solution.
Driven steel tubular piles provide a robust, versatile, and sustainable foundation solution, suitable for use in difficult ground conditions. They can include Hard driving conditions, backfill materials, and some obstructions, which can benefit from using this solution.
RB Combipile provides a robust, versatile, cost-effective, and environmentally friendly deep foundation solution. Where ground conditions exist that may damage the precast pile, a Combipile solution can be adopted comprising partial steel tube and partial concrete precast sections. The recycled steel tube is driven first, before joining the segmental precast to create the Combipile. This piling method can be considered where a solely driven precast concrete solution cannot be adopted. The part steel tube and part precast solution is then a cost-effective option to consider. No spoil is produced during the installation process as the pile displaces the lower level strata as it is driven deeper into the ground.
RB Combipile is a quick and clean displacement piling solution that is immediately ready for follow on construction.
Continuous Helical Displacement (CHD) Piling forms a screw-shaped cast in situ pile without producing any spoil. An ideal solution for contaminated sites, CHD piles can be used across various sectors and construction projects. This technique is commonly used within the residential and commercial sector and for schools, however, it can be considered in a wide variety of settings. The pile is Suited for light to moderately loaded piles and can be used in a variety of soils.
Auger Piling Solutions
CHAD piles are suited to most ground conditions and can be used for a wide variety of applications, having the most advantage where moderate to high loads are required and the ground conditions preclude the use of conventional CHD piles The CHAD pile is able to penetrate denser strata than CHD piles, whilst offering a reduced volume of spoil in comparison to a traditional comparable CFA solution.
CHAD offers partial displacement, with the auger removing the central core only of the pile using a single rig, negating the need to utilise a separate pre-boring rig to overcome issues with bands of dense strata to reduces costs, reduce the effects of surface heave in consolidated clays, and reduce the amount of spoil generated in comparison to conventional CFA piles.
CDA offers an alternative method to traditional smaller CFA piles, providing a more practical and cost-effective solution for your project. CDA piles are straight shafted bored displacement piles which provide enhanced capacity when compared to traditional auger techniques along with generating minimal spoil.CDA piles are suitable for lightly loaded structures, and as the same rig is utilised for both CHD and CDA the solutions can be combined to provide a cost-effective proposal for your scheme.
Advantages of Displacement Piling
- These techniques are displacement not replacement meaning there is minimal spoil generated, making it ideal for contaminated sites.
- For our driven piling solutions fewer traffic movements are required on-site compared to alternative piling methods, significantly reducing CO2 emissions on site.
- Displacement techniques are our most cost-effective deep foundation solution, as they do not generate spoil. Also, our Driven Precast Concrete Piles are designed and manufactured in-house in varying segmental lengths which can be combined to reach required depths, thereby minimising waste and improving cost-effectiveness.
- Driven precast, driven steel, and combipiles are Installed utilising RB’s in-house design and built ‘Quiet Hammer’ rigs which significantly reduce noise pollution when compared to conventional driven piling rigs on the market.
- Our Displacement Auger techniques are Low noise and vibration, ideal for environmentally sensitive areas.
- Our driven piling solutions offer improved Cleanliness of the working platform over wet techniques, lowering the risk of injury of onsite personnel.
- Our driven piling solutions are suitable for most soil conditions
- Both our displacement pile options, augered and driven are suitable for residential developments