Handbook for Bridge Inspections - TSP2
Handbook for Bridge Inspections - TSP2
Handbook for Bridge Inspections - TSP2
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The sound waves can be transmitted into solid materials, but not<br />
air. The test sensor should be placed on the surface; the sound<br />
waves are then bounced off the reverse surface oflhe test area.<br />
The results are recorded via an oscilloscope, and their interpretation<br />
places great demands on the operator. This person should possess<br />
the necessary qualifications and ex perience <strong>for</strong> recording and<br />
interpreting the results.<br />
X-ray and ultrasound tests complement each other. Ultrasound testing<br />
is the preferred method <strong>for</strong> checking <strong>for</strong> faults in bonding<br />
materials and certain types of cracks.<br />
Eq u i p me ntl Com pete nce<br />
Purpose<br />
Procedures<br />
Purpose<br />
Procedures<br />
E qu i p mentl Com petence<br />
These checks should be carried out by companies with properly<br />
trained personnel and special equipment.<br />
7.4.6 Magnetic Powder Check<br />
To check <strong>for</strong> the presence of cracks in the steel which are not<br />
visibl e to the naked eye.<br />
The extent of the cracks should be documented by means of drawings<br />
or photographs. Both cracks all the way through the steel<br />
and on the surface are to be drawn as a record. This type of test<br />
does not provide any measurements of the depth of the cracks.<br />
These checks should be carried out by companies with properly<br />
trained personnel and special equipment.<br />
7.4.7 Fi bre Optics<br />
To check <strong>for</strong> the presence of damage, e.g. corrosion or cracks, in<br />
enclosed or not easily accessible steel elements with the use of a<br />
fibre-optic equipped endoscope.<br />
These checks should be carried out by companies with properly<br />
trained personnel and special equipment .<br />
Purpose<br />
Procedures<br />
Eq u i p m e ntl Com pete nce<br />
7.4.8 Ultrasound Measurement of Material<br />
Thickness<br />
To measure the thickness of steel parts when directl y taken measurements<br />
are not possible, <strong>for</strong> example when only one of the steel<br />
surfaces is accessible. This may be the case with corrugated steel<br />
pipes and piles.<br />
Reference is made to Procedure 87.1838 and Chapter 7 A.5. The<br />
possibl e results of corrosion on the reverse surface do not reflect<br />
ultrasound impulses. The effecti ve thickness wi ll there<strong>for</strong>e be<br />
measured.<br />
These checks should be carried out by companies with properly<br />
trained personnel and special equipment.
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