Handbook for Bridge Inspections - TSP2

7.2.8 Measuring of Vertical Clearance
Purpose
Procedures
Scope
To measure the headroom for bridges crossing roads and the clearance
for sh ips under bridges over the sea or other water.
A headroom check may become necessary after rcasphalting or
ot her changes to the roadway or, for example, after a heavy load
has used the road. Depending on the bridge's design and the purpose
of the measurements it may be relevant to take maximum and
minimum headroom measurements.
Acceptance Inspection
Should the headroom of a new bridge not have been carried out at
the building stage, then this should be done al the latest during the
Completion SUlVey.
Major Inspection - Special Inspection
Headroom should be measured after rcasphalting or other works
which can affect a bridge' s headroom.
Equipment
* Measuring tape
* Telescopic measuring rod
* Surveying equipment
7.3 Adequate Materials
Investigation - Concrete
The following sections provide a description of the materials in vestigations
which can be undertaken during the inspection ofbridges
and their concrete elements.
When evaluating the condition of a concrete construction it is
important 10 remember that the different materials investigations
should be viewed in relationship to one another.
The local ising of materials investigations fo r coastal bridges is
specificall y dealt with in Chapler 7.3.9.
Refilling Test Holes..cuts
Several of the materials investigations carried out on concrete
require the drilling of holes or chiselling out cuts in the concrete.
Procedural Code - 2 lays down a requirement in sllch instances
that the holes/cllts be refilled. However, no guidelines have been
given as to how th is should be completed. The foll owing procedures
have therefore been recommended:
Holes of a Diameter < 25 mm
The hol es should be fi ll ed with grey paintable single-component
polyurethane grouting or equivalent cement mortar,
The holes should be completely fi lled using a tube connected to a