Road_009
a
b
c
d
One reason to stake out a point indirectly is that the peg would not
last long at the position of the actual point. In this example, the peg
staked directly would be removed as soon as the excavation work
starts.
Horizontal stake offsets are, like shifts, defined perpendicular to the centreline
of the layer the line(s) belongs to, if no offset angle has been defined. For sur-
face grades and road crowns, the stake offset is applied following the same
rules as stated for horizontal shifts. Refer to "43.4 Working with Shifts" for
more information.
For each stakeout method, a horizontal and/or vertical offset can be defined.
The stake offset and stake height difference are defined on the page of the
stake panel.
The sign convention for stake offsets and height differences is identical to the
convention used for design shifts.
a
g
b
c
d
e
f
+ +
Road_011
a
Centreline
b
Line on left side
c
Negative stake offset
d
Negative stake height difference
e
Line on right side
f
Positive stake offset
g
Positive stake height difference
The app offers for all stakeout methods a page showing a graphical representa-
tion of the measured position in relation to the design. If stake offset and/or
stake height difference are used, the map shows the original cross section view
of the design as well as the position to stake out. A yellow/black peg marks
the position to stake out.
43.6.5
Road - Chainage or Station Equations
Chainage or station equations are used to adjust the alignment chainage or
station. The most common reason for doing so is the insertion or removal of
curves during the design process. Inserting or removing a curve would require
recalculating the chainage or station of an entire alignment. Using chainage or
station equations eliminates this need. Chainage or station equations can cre-
ate either a gap or an overlap as shown in the following diagrams.
☞
Stake offset
Sign convention for
stake offset and
height difference
Map with stake offset
and stake height dif-
ference
Description
690
Roads - General
