P PALISADE

P

Metrology

Symbol of the Poise.

Pa Pa

Metrology

Symbol of the Pascal.

PACHOMETER Pachom tre

Equipment for Measure and Control

A hand-held device intended for the non destructive control of reinforced concrete structures.

Its principle is to operate a steel bar placed in a magnetic field. When the device is moved on the surface of concrete, the magnetic field it creates is modified when it comes near a reinforcement of the setting bar and the dial needle on the device consequently moves. The maximum displacement occurs when one stands at the plumb of the bar and the closer the bar is to the surface the more important the displacement is. In short, this device enables:

• to determine the position of the reinforcements in the reinforced concrete works;

• to measure the thickness of concrete which covers these reinforcements;

• to know (approximately) the section of these reinforcements.

Various types of pachometers can be found on the market among which: the JAMES pachometer, the CEBTP LOCAR L pachometer, the PROTOVALE CM 5 pachometer and finally a special type called Lizard whose characteristic is to move on vertical walls. The lizard consists of a ballasted fixed part, set at the base of the wall, carrying an electric winch; of a moving part carrying the detector or detectors which moves while rolling along the wall thanks to a draw cable. This carriage is guided by two other taut cables passing through grooves. The moving part carries the detector; signals gave off by...