CEP Magnetic Spider Extensometer Description
The CEP Magnetic Extensometer is designed to measure subsurface settlement or heave in earthfill embankments, excavation, ground improvement and land reclamation projects.
INSTALLATION
inclinometer casings or pvc access pipe with telescoping couplings are used
where the soil SPT value is less than 20 blows/30cm or where total vertical
or lateral movements are expected to exceed 50mm. In each installation a magnetic
datum is installed at the bottom of the inclinometer or pvc access pipe. The
BH is usually drilled to stable ground where the soil SPT value is at least
100 blows/30cm. The magnetic spider anchors are attached along the inclinometer
casing at the specified depths. A simple triggering device is used to release
the compressed spider legs to anchor at the specified depths in the soil.
MONITORING
The ground settlement or heave is measured by means of measuring the position
of the spider magnets with respect to the distance from the bottom datum. The
readout consists of a reed switch probe attached to an electrical tape with
1 millimeter graduations. A buzzer in the tape reel sounds when the reed switch
probe passes through the magnetic fields of the spider magnets and datum. The
depth of the spider anchors are read on the electrical tape.
SPECIFICATIONS
CEP2-4 Magnetic Indicator with 50m electrical tape, marked in mm. Other lengths
available upon request: 100m, 200m.
Note : Magnetic Spider can be adapted to fit 60mm O.D. PVC access pipes.
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