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Rotated profile
47.3.4
Overview
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c d
e
b
f
a
Tunnel_022
b
c
a
Tunnel_029
Scan profile
A tunnel surface is scanned in detail during construction and/or at the comple-
tion of construction to detect overbreak, underbreak and/or to create an 'as
built plan' of the finished tunnel surface.
Scan profile allows measuring a user-defined number of tunnel profiles along
an existing tunnel alignment.
It can be defined:
Whether to scan the whole tunnel profile or just a segment of it.
•
•
The interval between measurements around the profile.
It does not matter if a design profile exists in the job or not.
If the job does not contain a design profile, then before scanning the defined
scan area the instrument will first scan a profile at the instrument chainage.
For a description of the Scan Profile, Scan area page, refer to "47.3.1 Over-
view".
a
Centreline
b
Point to stake out on excava-
ted profile
c
Excavated profile
d
Design profile
e
Centreline offset
f
Centreline height difference
a
Centreline
b
Rotated centreline offset
c
Rotated centre height differ-
ence
Roads - Tunnel
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