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2.2.3 Installation of Model 4815 Hydraulic Load Cell
A particular installation, shown in Figure 13, used the Model 4815 Hydraulic Load Cell
to measure the concentrated load on a tunnel lining from an existing wooden pile
(supporting a building above) that had been cut short by the tunnel excavation in frozen
ground. The load cell was designed to measure any increase of load on the tunnel lining
that might occur when, at the end of tunnel construction, the ground was allowed to thaw
out. The load cell was positioned below the bottom of the pile and temporarily held in
place with lugs and a mortar pad until the shotcrete tunnel lining was sprayed.
Figure 13 - Model 4815 Hydraulic Load Cell Measuring Loads on a Tunnel Lining
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