TRENCHLESS TECHNOLOGIES
In order to avoid urban blockages caused by surface works for the installation and rehabilitation of underground pipelines for public utilities, trenchless technologies are often used, which allow the works to be carried out without the need to excavate ditches.
Trenchless technologies are the optimal solution for crossing roads and other transport corridors, as well as rivers and waterways.
AUGER BORING METHOD (MICROTUNNELING)
○ Auger boring can be defined as a method of boring beneath the earth’s surface by means of a jack and a bore. It works by simultaneously jacking the casing pipe while the rotating augers remove the excavated soil.
○ The auger machine can be installed using a steel sheet pile sending and receiving pit and also use sheet piles for manholes.
○ Auger boring is also known as dry boring because unlike other methods of boring, no slurry is generated.
○ During auger boring, a cutting head with a slightly larger diameter than the casing pipe excavates the soil just in front of the casing. The helical rotating auger blades carry the soil back to the machine where it is removed either by hand or machine. The auger boring machine runs along a track which is aligned with the casing pipe where it has to be installed.
○ Auger boring is cost-effective and less time-consuming. A good understanding of soil conditions where auger boring is to be carried out is essential while designing these projects, so geotechnical reports and investigations are indispensable.
LAUNCHING SHAFTS WITH SHEET PILES
