RST Instruments ICTS0005, System Instruction Manual

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2
RST Instruments
2 TILTMETER MONUMENT INSTALLATION
In order for the Tiltmeter installation to be successful, the Tiltmeter Monument must be rigidly
connected to the structure of interest, free of long-term adverse factors including corrosion, form
distortion, and impact damage.
2.1 F
RESH
C
ONCRETE
H
ORIZONTAL
In a typical installation on new concrete, the following procedure is suggested:
After the concrete has been placed and leveled in the location of interest, work the Tiltmeter
Monument into the concrete until the top surface of the plate is level with the concrete surface, with
the diagonal stud pairs aligned with the desired measurement axes, ideally with the orientation of the
studs consistent across the entire site.
If desired, increased strength of placement may be achieved by fitting countersunk brass screws
through the mounting holes and tightening nuts on the back side, leaving 50 mm of threads exposed
below the Tiltmeter Monument.
Ensure that no concrete is permitted to remain on the top of the Tiltmeter Monument, especially on
the studs. If necessary, carefully clean the studs with a damp cloth. Ensure that the Tiltmeter
Monument is protected from damage during curing, form stripping, and subsequent operations.
2.2 F
RESH
C
ONCRETE
V
ERTICAL
In order to avoid damage during form stripping, it is suggested that a separate form segment be built
in such a manner that the Tilt Monument is stripped separately. The separate form segment can be
drilled to suit the studs and greased to facilitate the stripping of the form and subsequent cleanup of
the Tiltmeter Monument. The separate form segment may ideally be recessed slightly below the
main vertical surface to give enhanced safety from damage.
The Tiltmeter Monument should be mounted with its face vertical and the axis from stud 1 to stud 3
vertical.
2.3 E
XISTING
C
ONCRETE
The Tiltmeter Monument may be attached to existing concrete using mechanical fasteners, using
grout, or a combination of methods. Mechanical fasteners require precise concrete drilling and/or a
central adapter plate. The effectiveness of grouts, either cement-type or chemical, is highly
dependent on the concrete condition, surface preparation, site conditions and other variables.
Figure 2: Tilt Monument Plate