Question

______ is used to sink the hole in ground where hand or mechanical augering is not possible, such as water bearing sand or gravels.
1. Technical auger
2. Casing auger
3. Boring rig
4. Belling bucket

Answer 1

Correct Answer - Option 3 : Boring rig

Concept:

Auger Boring: It is the process of forming a horizontal bore by jacking the steel casing through the earth from the main shaft to a reception shaft. Spoil is removed from inside the encasement by means of a rotating auger. These rotating augers carry the spoil back through the casing pipe to the main shaft for removal. An auger boring machine (ABM) bores through soil or rock with a cutting head attached to the ‘lead’ auger to install a steel casing pipe.

Benefits of Auger Boring:

1. A timeless application that creates extremely stable bores
2. The simple, effective method with a high success rate
3. Little to no disruption to surface, buildings, rail, or traffic
4. The safe, fast method with low operating costs   

A boring rig is a method used to sink the hole in the ground where the above hand or mechanical augering is not possible for water-bearing sand or gravel.

Casing auger:

• A cased auger is one that has been drilled with a sleeve in place to prevent soil collapse.
• A cased auger is a trenchless method of installing pipelines using horizontal augers or pipe jacking.
• A steel casing also known as a sleeve is installed as the borehole progresses requiring minimum overcut.

Belling bucket:

• Belling Bucket is used for enlarging the pile base in stable (mainly cohesive) soil conditions.
• The cutting arms are gradually opened by applying the vertical crowed force on a connecting rod and a leverage system.