Drilled Piling

Drilled piling is ideal for installing foundations in challenging ground conditions, such as soils with cobbles, boulders and rock layers, and has the capability of forming rock sockets. 

Smaller diameter piles can support heavy vertical loads as the overburden drilling techniques adopted have the capability of forming rock sockets into stronger underlying rock strata. 

A wide variety of drilling methods are available, depending on ground conditions and project requirements. 

What is Drilled Piling used for? 

Also known as replacement piles, bored pile, mini piles, cast-in-drilled-hole piles (CIDH piles) or cast-in-situ piles, has many applications within the civil engineering and construction sector. 

Van Elle offers a range of drilled piling methods, depending on ground conditions and foundation loads:

  • Odex rotary percussive for piles up to 323mm in diameter 
  • Rotary percussive for piles up to 900mm diameter 
  • Duplex rotary percussive for piles up to 900mm with 1050mm casing 
  • Superjaws casing advancement systems for rotary percussive for piles up to 813mm in diameter 
  • Elemex Super Jaws DTH (down the hole hammer) for permanently cased piles up to 1000mm diameter 

Key rig capabilities: 

  • Rig loadings: 1–40 tonnes 
  • Pile diameters as vary depending on drilling technique- 300 – 1050mm 

What are the advantages of Drilled Piling?

  • Larger diameter piles can be installed in restricted access and low headroom conditions 
  • Fast and accurate pile installation in challenging ground 
  • Ability to drill through unreinforced concrete obstructions 
  • Wide range pile diameters to suit high structural loads 
  • Low vibration and disturbance  
  • Piles can support compressive, uplift/tension, and lateral loads 

Common Uses

  • Structural foundations for heavy loads within restricted access conditions 
  • Installing piles through sands, gravels and boulders and rock 
  • Ideal for forming rock sockets to support heavy loads 

Drilled piling are installed using rotary percussive hammers and drill bits to simultaneously install casing as the pile bore is advanced. Compressed air or water is used as both a circulation and a flush mechanism to bring bored cuttings to the surface. Where a pile is to be founded in bedrock, casing is advanced to the rockhead before the drilling tool is extended to create a rock socket. Concrete and reinforcement is installed in the completed borehole and casing is either removed or left in place to form the finished pile.  

Van Elle have a unique offering providing cased piles including the rock socket in which the steel casing transfers the load and removes the need to concrete and reinforce the pile.