Leica Captivate - Left;Right Rail Stake-Out; Rail - Working with Offsets; Tunnel - Basic Terms

Description
The le
ft or right rail of a track can be staked out:
•
direc
tly,
•
horizontal and/or vertical offsets can be used to stake any point relative to
either rail.
Diagram - Staking out a point relative to the right rail
Rail_007
a
b
c
d
e
f
a Track centreline
b Le
ft rail
c Right rail
d Point to stake
e Horizontal offset from right rail
f Vertical offset from right rail
☞
The position from which the horizontal and rail offsets will be applied
depends o
n how the left and right rails were defined in the imported
design data. Using standard practice, the horizontal offset would be
defined from the active face of the rail, and the height offset would
be defined from the highest part of the rail, as shown in the diagram.
43.6.12 Rail - Working with Offsets
The sign convention for offsets is:
Rail_008
ad+
-b
c+
e-
a Centreline
b P
ositive horizontal offset
c Positive vertical offset
d Negative horizontal offset
e Negative vertical offset
43.6.13 Tunnel - Basic Terms
Term/Expression Description
Centreline Geometric alignment in two or three dimen-
sions t
o which all design elements of the
project are referenced.
Left/right rail stake-
out
Sign convention for
o
ffse
ts
Terms and expres-
sions
698 Roads - General