Continuous flight augering
Encyclopedia
Continuous flight augering (CFA) is a technique used in construction
to create concrete piles.
Continuous flight auger has been used in the United Kingdom
since 1966, but its use is relatively new in the United States
. A continuous flight augering drill is used to excavate a hole and concrete is injected through a hollow shaft under pressure as the auger is extracted. This creates a continuous pile without ever leaving an open hole.
Continuous flight augering can be used to construct a secant pile wall which can be used as a retaining wall
or as shoring
during excavation
. Once initial piles are set with concrete, other shafts are augured between them, slicing into the original piles, with the new ones receiving reinforcement. The finished result is a continuous wall of reinforced concrete that aids and protects workers during excavation.
Construction
In the fields of architecture and civil engineering, construction is a process that consists of the building or assembling of infrastructure. Far from being a single activity, large scale construction is a feat of human multitasking...
to create concrete piles.
Continuous flight auger has been used in the United Kingdom
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
since 1966, but its use is relatively new in the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
. A continuous flight augering drill is used to excavate a hole and concrete is injected through a hollow shaft under pressure as the auger is extracted. This creates a continuous pile without ever leaving an open hole.
Continuous flight augering can be used to construct a secant pile wall which can be used as a retaining wall
Retaining wall
Retaining walls are built in order to hold back earth which would otherwise move downwards. Their purpose is to stabilize slopes and provide useful areas at different elevations, e.g...
or as shoring
Shoring
Shoring is a general term used in construction to describe the process of supporting a structure in order to prevent collapse so that construction can proceed. The phrase can also be used as a noun to refer to the materials used in the process....
during excavation
Earthworks (engineering)
Earthworks are engineering works created through the moving or processing of quantities of soil or unformed rock.- Civil engineering use :Typical earthworks include roads, railway beds, causeways, dams, levees, canals, and berms...
. Once initial piles are set with concrete, other shafts are augured between them, slicing into the original piles, with the new ones receiving reinforcement. The finished result is a continuous wall of reinforced concrete that aids and protects workers during excavation.