IBJ TECHNOLOGY
Ingenieurbüro Jäger

Whether upper or under: Building damage reliably recognize

With the new procedure for the early recognition of building damage in the high and foundation engineering, announced by IBJ Technology to the patent, show themselves damage in the solidium substantially in former times as so far usually.

Well-known procedures seize the geometrical changes (lowering and/or deviation measurements) in the building, which already arose by effect of strange influences. Change of the stress and redistributions of stress arise however already before the geometrical changes. Ability these to be in time determined and interpreted, can be reduced larger damage to the building by suitable measures or turned away. The new and world-wide only procedure for the early recognition of building damage by the long-term observation and the comparison of stress measurements within the buildings by means of ultrasonic, is based on the akusto-flexible effect. The running time of an ultrasonic impulse within inhomogenously buildings is measured in homogeneous and isotropic measuring bodies. The speed of sound of the ultrasonic waves depends on the flexible stresses within the measuring bodies. If one uses a flexible not compressable medium, for example a solid body well-known composition, as measuring medium one can by the determination of the change of speed of sound, which tensions in the surrounding building determine. A condition for this measurement is form and actuated conclusion of the measuring bodies with the building. The connection of the measuring bodies knows positive connections by special cement, or for example by embedding in construction units with elastomers, by force and, how take place with supports from construction units or counter bearings from bridges. A highly soluble measuring technique signals changes in the stress structure immediately over a bus system. The new procedure can be begun favourably for the increased safety of underground buildings, so in the tunnel and build from caverns. The mountain stress in-situ are measured. The measuring bodies can be brought in also radially between the tunnel lining and the mountains. In connection with building information systems for buildings of all kinds it can contribute substantially to building security. More preferentially the installation takes place in foundations, columns or supports.

Applications:
Building from tunnel and caverns
Security of underground buildings
Building monitoring

So the tension sensors in the concrete could measure the load changes and stress changes with a building damage after eniem earthquake immediately on-line. The alert with GPS item data is spread world-wide over the Internet. The combination also for everyone accessible maps of the world (like for example: Google Earth, Maaps or MSN Virtual Earth) can facilitate the management after disasters substantially. So fast data are available over destroyed journeys in the case of seriousness.

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IBJ Technology

New procedure for the damage recognition at bridges

Revolutionary method for the recognition of bridges collapse.


Bridges can be supervised on-line. With that new procedures for the permanent monitoring of bridges and other traffic routes could be recognized disasters as in time in Minneapolis. The world-wide only on-line procedure permits the measurement of loads and stress situations directly in the building. With ultrasonic the stress in the building directly and in real time is seized. All changes can be transferred immediately on-line by Internet Monitoring or Wireless Lan. The sensors are brought either directly into the building or later attached to endangered places. Design features such as carriers or bridge bearings can be supervised particularly simply. The sensors are constantly at or active in the building. The simple structure and the small size permit comprehensive application at all buildings from steel or concrete. In the procedure many traffic routes could be supervised world-wide. The costs of such a monitoring are small.

Alarm over Internet

The collapse of buildings accompanies with a measurable change of the tensions and loads. These are correlation with the world-wide available stove data of seismic events and examined for plausibility. thus a distinction of natural occurences (earthquake, mudslide etc.) is possible.

Instrumenting with acousto elastical stress sensors in concrete