In special civil engineering, the auger drilling process is in practice a predominantly clockwise system. The connections are based on 6-kt or 8-kt. -Connections and threaded connections with or without mechanical locking. The auger drills are connected to each other using pins, heavy-duty pins, U-pins and auger connections. A distinction is made between hollow auger drills (with internal passage) and solid drill auger (without internal passage).

This drilling process in special civil engineering is used almost exclusively for loose/sandy soils, as well as for light rocky soils, silt and clay soils. The type of auger is selected based on whether the soil is cohesive or non-cohesive. With known geology, measurement points can be created, among other things, by drilling with a hollow auger drill.

With this soil condition, the hole “stands” after the auger drill has been pulled and does not collapse, so that screws with a closed base pipe and with 6-kt./8-kt. connectors are used.

In cohesive soils, also known as clayey soils, the auger drilling process in specialized civil engineering may be less suitable, particularly if the clay is too firm or too compact. Cohesive soils have a high degree of cohesion, which means that the clay particles are strongly bonded together and have little water permeability. Here you can possibly speak of a dry drilling process. Or even from using a auger drill.

If the soil is not cohesive, the hole may collapse after the drill string has been pulled. Auger drills with threaded, hexagonal or 8-sided connectors are used, which have a central hollow tube with internal and external threads. It is also possible to rinse through this hollow tube.

Wet drilling processes or hollow drilling augers can also be used with hexagonal or 8-point connectors.