Handbook for Bridge Inspections - TSP2

Equipment
* Theodolite
* Tripod
* Levell ing pole
* Measuring tape
* Levelling bolts and hammer action drill, if necessary.
Purpose
7.2.2 Horizontal Distances/Displacement
To measure movement, for examp le of abutment piers, piers,
superstructure etc.
Procedures
Reference is made to Procedure Movement. Movement can often
be noted in bearings and joint apertures and can be measured w ith
a folding rule or poss ibly by using a sma ll spirit level. Movement
in piers can be measured with a plumb linc. The measurement o f
movement should be taken in connection with recording the temperature.
Ifmovement has to be followed up over a period bolts
should be installed between which the measurements are to be
taken. In order to determine which parts are subject to movement,
a levell ing instrument can be empl oyed .
.. .
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Figure 7.2 ~ I MeaSliremelll of Displacemelll
Acceptance Inspection
sco pe
For all bridges with moving bearings an inspection must be made
of the bearing's placement, orientation and any displacement. The
first two points should specifically be checked against the original
drawings. The joint apertures and their associated temperatures
should also be recorded.
Other Inspections
The need for taking measurements should be assessed in connection
with the visual inspec tion.
Equipment
Purpose
* Fol di ng rul e
* Spirit level
* Plumb and line
* Thennomeler
* Levell ing Telescope
7.2.3 Measuring the Thickness of Wearing
Course
To measure the thickness of the asphalt wearing surface on the
bridge deck to check whether it meets requirements or not.