1. Introduction
Different
types of Inclinometer Casing have different degrees to which they can
bend, this is dependent on the type of casing and the diameter and
length of the casing.
2. Casing Deflection and What It Means
Please
see the below infographic which shows the deflection values of various
types of Inclinometer Casing.
Let's look at the third one down for an
example, we can see that it's orange (meaning it's Easy Connect casing)
and it has an outer diameter of 70mm, this is the most common type of
casing.
We can see that it allows for around 46mm of deflection in a 1m
length, any more than this and the Inclinometer will foul against the
side of the casing.
It's rare that 46mm of deflection is experienced in a
metre only, if you were to see the deflection happening over 3m, you
would be allowed a deflection of 138mm before running into trouble.
The
deflection can be seen when looking at Inclinometer data in In-Site
using the Incremental Deflection graph when comparing two reading sets,
let's look at the graph below and work out the deflection between the
two circled points.
We can see that the deflection starts at -0.03mm,
goes out to 0.20mm at the maximum, and comes back to -0.03mm, this all
happens over 2m; therefore we can say that 0.46mm of deflection has
occurred over 2m, and thus 0.23mm of deflection has happened over 1m, so
we're very much safe from the 46mm maximum deflection over a metre.
If you have any further queries regarding Inclinometer Casing Deflection, please submit a support ticket or call Soil Instruments on +44 01825 765370 for advice.