Triefus Triple Tube Core Barrel for dam sites / well mineral
resources core drilling
Triefus Triple Tube Core Barrels
Triefus Triple Tube Core Barrels designed for dam sites , bridges ,
building , well mineral recources core drilling
Triefus Triple Tube Core Barrels is a precision instrument designed
for dam sites, bridges, building, well mineral recources core
The Triefus Triple Tube Core Barrel is a precision instrument
designed to maximize core recovery in site investigation and
exploratory drilling programs. With this cafe barrel it is possible
to obtain as near to 100% volumetric core recovery in as
undisturbed condition as it is possible to achieve with rotary core
drilling equipment. It is not uncommon for drillers to report 98% +
core recovery in the most difficult formations.
The results obtained from the use of Triefus Triple Tube Core
Barrels can be a deciding factor in the investment of large sums of
money in areas such as foundation design for dam sites, bridges and
building, as well as the development of mineral resources. These
results must be as accurate as it is possible to obtain. Triefus
Triple Tube Core Barrels are capable of giving these results even
under the most adverse circumstances provided they are used with
the care that their function demands.
When used in conjunction with the Triefus Borehole Impression
Device, it is possible to orient the core, differentiate drilling
fractures from natural bedding planes and precisely locate the
position of any core loss. An easily transportable permanent record
of cored borings is also available for laboratory use.
In addition to the standard Triefus Triple Tube Core Barrel a
retractor model is available in most sizes for coring very soft
formations where the core may be washed away by any excess jetting
action while circulating. Many parts are interchangeable between
both types of barrels and the retractor barrel can be converted to
a standard barrel on site.
Triple Tube Core Barrels (Standard)
The Triefus Triple Tube Core Barrel, as described in figure 1, was
developed nearly sixty years ago in conjunction with the snowy
mountains hydro electric authority and the joint coal board of
Australia for coring the badly weathered and decomposed granite in
south eastern new south wales ‘from the grass roots down’.
Set O.D. of Bit
Set Core Diameter
Set Reamer Diameter
3-5/8' x 2-1/2'C
4-3/8' x 3 C
5' x 4 C
7’x 5 C
10'x 8 C
The cutting sizes AMLC, BMLC, NMLC and HMLC are to international
standards and are used with standard W series casing. Water Ends
are threaded to accept W series drill rods. From 2C to 8C the
barrels are supplied with rod connections specified by the client.
The letters ‘LC’ used in the reference nomenclature refer to ‘Large
core’ to differentiate between the original double tube core
barrels (NM etc.) in which the core diameter was much smaller than
that obtainable with these barrels.
All Triefus Triple Core Barrles are normally supplied with steel
split inner tubes; however plastic (non-split) inner tube is
available in NMLC size and stainless and hard chromed split tubes
can be supplied for most other sizes. The plastic inner tube is
used in NMLC triple tube core barrels where it is desired to retain
the core exactly as it is recovered from the hole. The core is not
removed from the plastic inner tube which is sealed at each end and
despatched undisturbed to the laboratory. Because the plastic is
clear and only 1 mm thick, visual examination of the core is
possible at the drill site.
The outer tubes of all Triefus Triple Tube Core Barrels are hard
faced at each end. Staggered hard facing over the full length of
the outer tube can be supplied if required.