Distance along a particular element
By the distance along a particular element of the design profile and an offset
from the element.
d e
c
b
a
Tunnel_006
a
Centreline
b
Point on tunnel face to stake
c
Element of design profile to stake
d
Distance from start of design pro-
file element
e
Offset perpendicular to design pro-
file
Staking tunnel profiles
Tunnel profiles are normally staked after excavation to indicate the position of
tunnel design elements or services such as lighting or ventilation.
Basic terms
Usually a tunnel under construction is designed and built in various stages such
that a given chainage can have various design profiles. For example shotcrete
or final lining. Each design profile is called a layer.
b
a
c
Tunnel_007
a
Centreline or axis
b
Final lining
c
Shotcrete
Measuring tunnel profiles
Tunnel profiles are normally measured after excavation to compare the excava-
ted profile with the design profile. This check can occur during the excavation
phase of the project or for quality control checks of the built tunnel.
When measuring tunnel profiles, it is possible to scan various profiles from one
instrument position. The profiles to scan are defined with respect to a defined
chainage. Profiles can be scanned at a given forward and back interval within a
given forward and back distance from the defined profile.
Tunnel profiles
Roads - General
701
Содержание Captivate
Страница 1: ...Leica Captivate Technical Reference Manual Version 3 0 English...
Страница 153: ...3 Continue as if creating a new polyline Refer to Create new polyline Several segments Creating Points and Lines 153...
Страница 561: ...Next step Store saves the new coordinate system QuickGrid 561...
Страница 786: ...7 Stake Line To stake out the selected intersection point all delta values must be 0 000 786 Roads Road...
Страница 812: ...Tunnel Profile Editor Profile details view Tunnel Profile Editor Layer details view 812 Roads Tunnel...
Страница 839: ...Field Option Description Offset limit Editable field Maximum horizontal offset from defined pro file Roads Tunnel 839...
Страница 848: ...Field Option Description Scans com pleted Display only Number of scans being measured Number of total scans 848 Scanning...