Continuous Flight Auger

by Colm Edwards | Nov 5, 2014 | CFA, Techniques

Instal­la­tion process CFA piles are formed by drilling a con­tin­u­ous flight auger into the ground. The sides of the hole are sup­port­ed at all times by the soil-filled auger, elim­i­nat­ing the need for tem­po­rary cas­ing or ben­tonite slur­ry. Upon reach­ing the...

Secant Bored Pile Retaining Walls

by Colm Edwards | Oct 30, 2014 | Secant Bored Pile Retaining Walls, Techniques

This sys­tem involves con­struct­ing inter­lock­ing bored piles to form a con­tin­u­ous con­crete piled wall suit­able for water bear­ing ground con­di­tions. The un-rein­forced pri­ma­ry piles are con­struct­ed first, often using Con­tin­u­ous Flight Auger...

Soil nailing

by Colm Edwards | Oct 30, 2014 | Soil Nailing, Techniques

Soil nail­ing has become very pop­u­lar over the past two decades espe­cial­ly in embank­ment sta­bil­i­sa­tion works asso­ci­at­ed with motor­way widen­ing and rail­way embank­ment sta­bil­i­sa­tion. It is espe­cial­ly use­ful for sites with dif­fi­cult access as the...

Rotary Bored Piling

by Colm Edwards | Oct 30, 2014 | Rotary Bored Piling, Techniques

Rotary bored piles dif­fer from CFA piles in that a tem­po­rary cas­ing is installed to sup­port the bore from col­lapse in unsta­ble ground con­di­tions, for exam­ple in super­fi­cial soils. Where cas­ing lengths are short they can be insert­ed as a sin­gle plain...

Restricted Access Mini Piling

by Colm Edwards | Oct 30, 2014 | Restricted Access Mini Piling, Techniques

For dif­fi­cult access or low head­room sites small pur­pose built pil­ing rigs can be employed. They use either rotary or con­tin­u­ous flight auger tech­niques to suit the pre­vail­ing ground con­di­tions. Using such meth­ods mini piles can be drilled in diam­e­ters...

Contiguous Bored Pile Retaining Walls

by Colm Edwards | Oct 29, 2014 | Contiguous Bored Pile Retaining Walls, Techniques

This sys­tem involves con­struct­ing dis­crete piles in a line to form a retain­ing wall. The piles are typ­i­cal­ly spaced out with their cen­tres 150mm greater than their diam­e­ter; for exam­ple, 600mm diam­e­ter piles at 750mm cen­tres. They are drilled with...