Augering and Extraction Kits for optimal Access Tube installation
Proﬁle Probes are used within access tubes inserted into augered holes in the soil – correct installation is vital for accurate measurement of soil moisture proﬁles.
The goal of installation is to produce optimal contact between the soil and the wall of the access tube. The augered holes should be straight, smooth sided and the correct diameter. Delta-T augering kits help you achieve the best possible access tube installation in virtually any soil. However it may not be possible to install an access tube successfully in very stony soils, or where a site features compaction, voids, foreign bodies, or soil instability.
Three types of augering kit are available (a PR-AUG2 25mm spiral auger should be ordered in addition to the selected kit for dry sandy soils).
Augering Kit features
The key components are:
Stabilisation plate to keep the auger vertical. Reading errors can arise from conical enlargement of the hole (funnelling) during augering, especially in the top 30cm. This results in poor contact between the surface of the access tube and the surrounding soil. The stabilisation plate minimises this effect.
Insertion rod to drive the access tube into an augered hole by applying force to the bottom of the tube (normally by hammering). This new technique reduces the ﬂexing that can produce air gaps around the access tube and minimises soil displacement.
Finishing auger to expand augered pilot holes to the exact diameter required for an access tube. This specially designed adjustable ﬁnishing auger produces straight, smooth-sided holes in most soil types.
The optional PR-EXK1 is a heavy duty system for removing installed access tubes from the ground. The kit includes a cast iron jack, chains, jack foot and a tube clamp
|Augering kit selection|
|soil type and depth||PR-ASK1-S Starter Kit (short)||PR-ASK1-L Starter Kit (long)||PR-AKC1Complete Kit|
|Up to 40cm depth||✓||✓✓||✓✓✓|
|Up to 1m depth||✗||✓✓||✓✓✓|
✓ = Meets basic need
✓✓ = Well suited
✓✓✓ = Well suited & includes items for extra convenience
✗ = Unsuitable
|PR-ASK1-S||Augering starter kit (short). For short access tube installation only, includes 24mm pilot auger, stabilisation plate and access tube insertion rod.|
|PR-ASK1-L||Augering starter kit (long).For access tube installation (long or short tubes), includes all items in PR-ASK1-S Kit, plus ﬁnishing auger and mallet.|
|PR-AKC1||Augering kit (complete).For access tube installation (long or short tubes), includes all items in PR-ASK1-L Kit, plus ﬂexicanes, carrying bag and cleaning rod.|
|PR-AUG2||25mm spiral auger, for dry sandy soils.|
|PR-EXK1||Access tube extraction kit.|