Handbook for Bridge Inspections - TSP2

evidence of deep-seated corrosion. In this way one can determine
the size of the surface area requiring sandblast ing and the application
of new paint surfaces.
Surface Treatment
The most conveni ent way of calculating the area that and treatment,
is from the original drawings. If these do not exist,measurements
must be performed. In some cases there might be a necessity
of taking samples in order to determine the type of coatings. The
selec tion of repainting system is dependent on the existing coating
system. In most cases it is reasonabl e to paint some test-areas
before th e final painting system is being determined.
Railings and Parapets
Joints
So far as damage to rai lings or parapets is concerned, measurements
should be taken of the total length in meters of those sections
to be repaired and those to be repl aced. The total number of
posts to be rep laced should also be calculated.
If the renewal of joint sections is considered a possibility, the joint
apertures should be measured and th e temperature recorded. It will
also be necessary to clarify whether the apertures are sufficiently
wide or whether they shou ld be widened/narrowed. In add ition the
length of the joint construction should be measured. A check
should al so be carri ed out to determine whether there are ex isti ng
railing posts which could be in the way of new joint constructions.
Consideration should also be given to the need to jack up/adjust
bearings due to differences in their settings.
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Handbook for Bridge Inspections