U**0 sampling system, U**0 samplers
U**0 (U4) and U*0 Samplers used for obtaining undisturbed samples
in most soils and some weak rocks. The U**0 sampler gives a nominal
**0 mm (4") diameter sample and the U*0 gives a nominal *0 mm
diameter sample.
U**0 Sampling Systems
This equipment is designed for obtaining undisturbed samples in
most soils and some weak rocks such as Chalk and Marl. The sampler
produces a nominal **0 mm (4") diameter soil core, approximately
**0 mm (*8") long.
The sample tube with attached cutting shoe is driven into the
ground by means of a Sliding Hammer.
A Drive Head (or Bell Housing) fits between the Sliding
Hammer and the Sample Tube and contains an "overdrive space" and a
ball valve. The ball valve allows air to be released as the tube is
driven into the ground.
Two types of U**0 sampling system are in common use
:
Standard System
Consists of a Steel or Aluminium Sample Tube,Cutting
Shoe and optional Corecatche Cutting shoes are
case-hardened and may have a plain or serrated edge. Plastic or
Alloy End Caps are available to fit sample tubes and a
special Sealing Wax is used for long-term storage of
samples.
Plastic Liner System
Consists of a steel Body Tube, which encloses a
replaceable Plastic Liner. Plain or serratedCutting
Shoes attach onto the base of the Body Tube, and an
optional Corecatcher and Spacer Ring (required
when a Corecatcher is used). Plastic End Caps are
available to fit the plastic liners.
Although using Plastic Liners reduces the overall cost of obtaining
and storing samples, the cutting shoe is necessarily thicker and
thus the sample significantly more disturbed compared with the
Standard System.
For both systems Connectors are available to join two or
more sample tubes together in series.
