SELIX EQUIPMENT INC.
JEFF CALOW | EASTERN CANADA
OFFICE: 1.647.532.1416
EMAIL: JEFF@TEIROCKDRILLS.COM
WESTERN EQUIPMENT SOLUTIONS, LLC
CRAIG BERNINGER | WESTERN NORTH
CANADA
OFFICE 1.801.560.9170
AMERICA
EMAIL: CRAIG@TEIROCKDRILLS.COM
accordance with ASTM D6760 (ASTM
2014a). As shown in Figure 7, significantly
cleaner signals were produced
for the CSL tests performed using fully
threaded hollow rebar access tubes
compared to the tests (in red) that used
roughened PVC access tubes, resulting
in improved clarity.
These results indicate that there
are no barriers to use hollow rebars in
both structural applications and quality
control. In addition, the locations of
prefabricated voids that were used for
mounting the hydraulic actuator for
the lateral loading tests and a known
planted anomaly were identified by the
CSL measurements more clearly with
the hollow rebars.
Hollow bar micropiles with inside
strain gauges or TIP wires
In grout injection bored hollow bar
micropiles, TIP wire probes as well
as strain gauges can be installed into
the grout filled hollow bars. Terracon
installed strain gauges inside Titan
40/20, 52/26 and 73/53 hollow bar
micropiles at two projects in Las
Vegas, Nev., (Figures 8 and 9) to
monitor load transfer during testing
and construction.
TECHNICAL
Figure 7
Figure 8
Figure 9
Time (microseconds)
Crosshole Signal (millivolts)
CIR – PVC Tubes
HSIR – Hollow Bar
1000
750
500
250
0
-250
-500
-750
-1000
0 50 100 150 200 250 300 350 400 450 500
PILING CANADA 53
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