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2.2.2 Installation of Model 4810 Contact ("Fat Back") Pressure Cell
This section details installation instructions for Model 4810 Earth Pressure Cells, which
are used for the measurement of earth pressures on structures. In backfills for piers, piles,
bridge abutments, retaining walls, culverts and other structures the cells may be installed
either inside a concrete structure being poured or directly on the surface of an existing
structure. For slurry walls, the Model 4820 Earth Pressure Cell is used as described in
Section 2.2.4.
2.2.2.1 Installation in Poured Concrete
When pouring concrete the cells can be held to the forms using nails through the lugs
welded to the edge of the cell. Position the cell so that the thin pressure sensitive plate is
directly against the concrete form. Nail the plates to the form lightly in such a manner
that they engage the concrete sufficiently and will not pull out of the concrete when the
forms are removed. Route the cable inside the concrete to a convenient readout location
or to a block out inside where excess cable can be coiled. Protect the cable from damage
during concrete placement and vibration, by tying it to adjacent rebars. See Figure 11.
Concrete Form
Excess Cable
(coiled inside blockout)
Pressure Cell
Double Headed Nails
(through mounting lugs, 4 places)
Side View
Front View
Figure 11 - Attachment of Model 4810 to Concrete Form
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