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43.6.15
Description
☞
Centreline shifts
702
Measuring tunnel profiles - Plan view
h
e
a
b
f
Tunnel_009
Profile view
Tunnel profiles can be measured vertically, horizontally or perpendicular to the
tunnel centreline.
c
d
a
Tunnel_010
Tunnel - Shifts
When working on site, often design data does not match the measured data.
For example, an existing road surface that should intersect with the design sur-
face may be 15 cm higher than the plans indicate. For a smooth intersection,
this difference is distributed over the remaining 100 m of paving. To handle
these situations, the app allows the possibility of adding shifts to the existing
design data. A shift is applied when selecting the element to stake out/check.
Shifts do not change the stored design. They are applied temporarily for stake
out purposes.
Horizontal and vertical shifts
Horizontal shifts are always perpendicular to the centreline whereas vertical
shifts are applied along the plumb line.
a
b
Road_013
Constant and linear shifts are supported
For both horizontal and vertical shifts, two different types can be applied:
Constant:
The shift remains the same from its start chainage or station
to the end chainage or station.
a
d
i
b
c
d
e
c
f
g
g
h
i
e
a
b
c
b
d
e
a
b
Centreline
Instrument position
Tunnel face
Defined profile to scan
Instrument profile
Back distance
Forward distance
Back interval
Forward interval
Centreline
Tunnel face
Horizontal profile
Profile perpendicular to cen-
treline
Vertical profile
Horizontal alignment with
constant shift (plan view)
Vertical alignment with con-
stant shift (profile view)
Roads - General
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