APPLICATION OF MAGNETIC EXTENSOMETER IN EXCAVATIONS


The magnetic extensometer is a system which is used for examining the settlement and heave in foundations, digging and barriers. Settlement occurs at the depth or the position and is identified there. It is there only where the settlement is measured.
The soil extensometer incorporates magnetic targets that are placed so that they can move freely outside the access case or inclinometer case which is flush joined. The 3 or 6 Leaf Spider, magnetic settlement plates or magnetic joints can be the targets.
The relative position of the magnetic targets is used for measuring the settlement. This is done by using a Reed Switch Probe which helps in identifying the magnets which are lowered down through the central access casing.
Features
This device helps in the total and the progressive settlements too. The Following are the characteristics of a magnetic extensometer that are used in the task of excavation.
Convenient handling
As an alternative to the measuring tape, the magnet extensometer uses a graduated cable which is very easy and convenient for handling. It also winds up very easily. The diameter of the cable is 3.5 mm or 0.125”. It has a pair of steel conductors for the better stability of the dimension. The cable jacket is made up of polyurethane which is extremely flexible and has very high resistance power against abrasion.  A laser marks the graduation on the cable jacket. These are durable just like the cable jacket is.
Precision
The readings are repeated to +/-3 mm or +/- 0.1 inches. By constructing a reference stand that comprises a Vernier dial gauge, a great level of precision can be achieved.
Application
The magnet extensometer is used for examining the settlement and heave in the digging, foundations, dams, and embankments. This device can also be fixed at the back of the retaining structures like sheet piles and slurry walls, over the ground openings like tunnels and shafts. Information from the device can be used for signifying the depths at which the settlement has occurred and even the total amount of settlement is recorded through this device.
Installed components
The components which are already installed in the device are access pipe, datum magnet, spider magnet, plate magnet and various telescoping sections.
The datum magnet is located at the end of the tube which sets a benchmark. Measurement of all the other anchors is provided to those benchmarks for the calculation of the absolute settlement of every anchor point.

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