Javad TRIUMPH-LS, User Manual

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73
Stake Out Alignments
By default, parabolic curve has “
Grade In
” (starting
slope) and “
Grade Out
” (ending slope) identical (that
is, forming a straight line) and equal to the ending
slope of the previous section.
Note: In current implementation all slopes are defined
in percent, i.e. as Δ(vertical)/Δ(horizontal)*100%.
We need to create transition curve for 5% target
slope. So, enter “50.0” as horizontal length and “5.0” as
“
Grade Out
”.
Note: You can also enter “ End Elevation ”, and “ Grade
Out
” will be computed automatically (in our example,
set “
End Elevation
” to 151.25 and “
Grade Out
” will
be calculated as 5%). As a parabolic curve with fixed
starting slope and horizontal length has only one
degree of freedom, “
End Elevation
” and “
Grade Out
”
fields cannot be edited independently.
Now our screen looks as shown in Figure 25.
Figure 25
Tap “
New Section
” to create straight line, note that
slope is automatically set to our desired 5%, and edit
“ Hor. Length ” to 35.0 (Figure 26).
Figure 26
The procedure has become a little bit boring, so let
us get familiar with the List screen and create another
transition parabola via copy. Tap the “
List
” button at
the upper right corner of the screen.
Figure 27