IMKO TRIME-FM, User Manual, Page: 12 / 22

12
3 Access Tubes and Augers
The penetration depth of the measurement field of the 44mm TRIME tube-access-probe is up to
150mm into the soil. The measurement sensitivity is the highest near the access tube and decreases
exponentially into the medium. Therefore the insertion method of the access tube is very important.
Auger
equipment for
the direct setting
of the access
tubes into
homogeneous
soils.
Small version
without soil
anchors for
access tubes
with 1m length
Pre-boring
with an
Edelman-
auger
Fixing
of the
rubber
bung
TECANAT
access
tube
Support
pillar
with clamp
device
Ramming head
with clamp device
Screw
auger
with
handle
Internal
steel guide
and
protection
tube
Steel cutting shoe
of access tube
Soil
anchor
Clamp
device
for
rubber
bung
Pre-boring of bore holes with standard augers destroy the soil texture, because it is difficult to come to
a good and close contact of the access tube inside the soil. With the described auger equipment it is
possible to set the access tubes directly into homogenous soils without pre-boring. In very stony soils it
is not possible to use this method. Therefore it could be possible to use an Edelman-Auger for pre-
boring and closing the air gaps with mud. Changes in soil structure, and a delay time (up to 4 weeks)
before it is possible to come to precise measurement values must then be accepted.
The IMKO auger equipment consists of: access tube support pillar with three soil anchors, ramming
head with clamp device, screw auger with handle, clamp device for the rubber bung, and an internal
steel guide/protection tube. Deliverable is a small version without soil anchors for setting of glass fibre
tubes with 1m length.
A steel cutting shoe is glued into the access tube. The screw auger, that moves easily within the guide
tube is used to drill out soil to about 0,1m below the cutting shoe. Depending on soil homogeneity, the
tube can be hammered 5..10cm into the soil. This cycle is repeated until the tube is fully installed. The
internal protection tube is then removed and the access tube can be sealed by a rubber bung.