Encardio-rite normal and inverted plumb lines are simple and reliable systems that are widely used in civil engineering projects where highly accurate long-base rotation/tilt/relative displacement measurements are required, like in high rise buildings, concrete and masonry dams, etc.
Plumb line is mainly used in concrete and masonry dams for measurement and monitoring of relative displacement between:
· Dam top and the base
· Base and the foundation rock
Normal Plumb line
This assembly is used when displacement between the top and base of a dam is to be measured and monitored.Model EDS-50 normal plumbline consists of a plumb line wire fixed through a collet arrangement centered on a rectangular collet bar at the top of the structure/dam. A heavy weight is clamped at the lower end of the wire, which is damped in a tank filled with oil, to prevent any to & fro oscillatory movement of the plumb due to vibration or shock.
Inverted Plumb line
The assembly is used when the displacement between the base of the dam and the rock foundation is to be measured and monitored. Model EDS-51 inverted plumb line monitors displacement between the structure/dam base and rock foundation. The plumb wire is anchored between rock foundation (bottom of drilled hole) and float submerged in a water tank in the observation area. A tension is maintained in the plumb wire as the float is free to move. Water in tank acts as a damping medium. A tilt or displacement in the foundation brings about a shift in the float which is measured by readout systems mentioned above.
For talking measurements, Encardio-rite provides two options:
· Portable optical readout system, comprising of two travelling telescopes(one each for X and Y axes) for measurement of displacement
· Model EPR-01S an advanced automatic readout unit with remote real time monitoring facility, comprises of two contactless inductive sensors that give position of the pendulum wire in two directions.