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HSi-300 ASCB Video 2008
Earthquake disasters - in-situ stress measurement in concrete - a component for the geolocation
With the new acousto elasticy sensors of IBJ Technology can be measured for the first time the concrete tension on-line permanently directly. No sensors are needed for the measurement of the stretch. The acousto elasticy effect seizes directly the influence of the concrete tension on the wave velocity of ultrasonic. This speed change of the ultrasonic waves directly in the sensor are measured. The sensors consist of a small measuring body, which is embedded in the concrete. The pressure strength of the sensors is so large, which is practically indestructible them. In practical attempts concrete inspection pieces were completely destroyed. The tension sensors get over this crash without prejudice to and remain in function. The concrete case of application of these new sensors of IBJ Technology for stress measurement in concrete are on-line measuring procedures for building security. The sensors are characterised by their special suitability for the remote monitoring of buildings of all kinds.
The instrumentation use of the acousto elasticy effect makes qualitatively and quantitatively new measuring and safeguards methods possible in buildings and in the mountains. As example of possible applications the monitoring of local tensile states in buildings can be enough over Period to be called. Further new and at the same time economical applications result, like on-line monitoring of the answer spectrum of buildings of any kind in seismically active areas. Already during the building phase measurements are possible in foundations and stakes. Also tunnel-build with high overlays and/or large ground pressure features can so on-line be supervised. The measuring bodies can be brought in already in the phase of the building production, i.e. concreting. Also an additional installation into boreholes (method of the hard inclusion) or the spanning in expansion joints of buildings is possible. Innovative applications know a world-wide disaster net (disasters net).
The availability of means of transport and traffic center (roads, bridges, airports, tunnels) can within seconds be determined on-line. The representation of the destruction takes place with the geo location (Disasters Geolocation).
The activity of relief organizations can be arranged so efficient The administration and authorities of the states receive such an aid to the maintenance of public security. Seismic data describe only the geographical place and the strength. Reliable on-line data are missing for the degree of the destruction. Seismic sensors bring only measured values to acceleration. Data for the degree of the destruction must come objectively from the building (object).
The data necessary for it are determined with acousto elastic sensors by IBJ Technology.
About the Author
Frank-Michael Jaeger is founder of the IBJ Technology. IBJ Technology is owner of several patents for innovative measuring techniques.





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