Piling - Techniques

Continuous Flight Auger

• Unstable Ground
• High Groundwater Levels
• High Speed
• Quality Control Essential

A Continous Flight Auger (CFA) pile is formed by drilling into the ground with a hollow stemmed continuous flight auger to the required depth or degree of resistance. No casings are required. A cement grout mix is then pumped down the stem of the auger. While the cement grout is pumped, the auger is slowly withdrawn, lifting the soil on the flights. A shaft of fluid cement grout is formed to ground level.

Sectional Flight Auger 

• Uses 1-2m Flight Sections
• Solid or Hollow Stem
• Temporary Casing Often Used
• Reinforcement – Section
• Grout VS Concrete 

 A sectional flight auger pile, is formed by drilling into the ground with multiple flight sections installed to the designed depth.

The sectional quality to these machines allows installation in restricted access zones. The rigs are very versatile and can be utilized in the majority of Abbey Pynford’s projects.

It is most common to bore the pile and fill with concrete post extraction; however this will depend on the ground conditions encountered.

Top Driven

• Rapid Mobilisation
• Minimal Site Preparation
• Compression Tension, Raking Piles
• Residential and Commercial Applications

Abbey Pynford’s Top Drive piling rigs are lightweight rigs that have been specifically developed to require minimal site preparation. They are ideally suited to both large open sites and smaller infill sites.

Reaction Piles

• Presscore
• Jacked in Piles

 Abbey Pynford owns bespoke equipment to jack piles into the ground. The Presscore units can be pushed into the ground until a jacking pressure is achieved relating to the loading of the structure. The structural loadings and jacking pressures are designed by our in-house department.

Abbey Pynford own a number of 10T and 50T jacks that can be utilized in the jacking processes. In extreme examples whole houses can be jacked to a level if subsidence has not detrimentally affected the fabric of the structure.

Internally Driven

• Grundomat
• Drop Hammer Rigs

Abbey Pynford install a range of high performance mini piles using dynamic energy techniques and pneumatic soil displacement systems from 100mm diameter up to 300mm.

These systems work particularly well with relatively shallow bedrock strata. The mobilisation and installation of the piles relatively fast compared to SFA techniques, however the noise and vibration of these rigs must be considered for the surrounding environment.

Special Geotechnical Processes

• Soil Mixing
• Ground Anchors
• Soil Nails
• Void Grouting

Abbey Pynford uses its specialist ground engineering knowledge to quote the most cost effective foundation design for any project. In some cases special geotechnical processes work out as the most efficient way to install the foundations.

The type of soil improvement scheme depends on the underlying ground strata and therefore a good site investigation is key to ascertain a developed quote.

Restricted Head Room Piling

• Widest Range of Mini Rigs
• Pile Diameter 150-1000mm
• Pile Depth up to 35m
• Headroom 2.5m

There is a distinction between purely restricted access piling and headroom. Abbey Pynford specialises in both.

The options available to clients are clearly met by experienced estimating staff who know the limitations of the equipment intimately.