Cross Hole Ultrasonic Monitor - with Tomography support
CHUM supports Cross Hole Sonic Logging (CSL) as well as Single Hole
Ultrasonic Testing (SHUT, SSL) and two- and three-dimensional Tomography
(3DT, CSLT).
This is the primary method used in the industry for for high
resolution testing of large drilled piles (ACIP)
Applicable standards: ASTM D6760-07, AFNOR NF P 94-160-1 (2000)
Uses the pulse-echo method (PEM, PIT) for pile testing. The pile is
struck with a handheld hammer and the PET digital accelerometer records the
reflected waves on the computer screen. The resulting signal (reflectogram)
readily provides information regarding the pile’s length and integrity.
This is the primary method used in the industry for for quick quality
control of a large number of piles.
Two PET versions are available: PT001 - USB PET and PT002– Bluetooth PET.
PSI uses the well-known Parallel Seismic method to establish the depth of
existing foundations (specifically piles) where the superstructure precludes
access to the pile heads.
The test requires the installation of a plastic access tube in parallel,
and as close as possible, to the tested pile. The tube should be carried
down to a depth exceeding the assumed pile length by a margin of 8-10 m and
filled with water. In unsaturated soils the tube should be firmly grouted in
the hole to achieve good coupling with the surrounding soil.
SAM measure changes in pre-stressed soil and rock anchors force.
Pre-stressed soil and rock anchors are widely used in civil engineering
to resist the horizontal pressures acting on retaining structures. With
time, anchor force may decrease due to relaxation and creep. As a result,
anchored elements may displace excessively and eventually fail. Therefore,
it is extremely important to have suitable permanent means to measure the
residual force and verify that the anchor is functioning properly and
according to design.
Advantages: Low cost, accurate, integral, simple installation and remote
monitoring
