6.6
Plant, equipment and documentation (03 46001 – 03 46040)
03 46001
horse head
rectangular frame (01) that supports a main tunnel (01) during construction (01) of an opening in its tunnel lining (03 42005)
03 46002
Prince of Wales feathers
frame (01) supporting the top of a main tunnel (01) during construction (01) of an opening that consists of a central post (01) with splayed struts (01) supporting a tunnel head tree (03 46016)
03 46003
side tree
vertical or inclined support at the side of a heading (03 41005) or horse head (03 46001)
03 46004
leg
vertical or nearly vertical member at the side or face of a heading (03 41005) to support head boards (03 46007) or heading head trees (03 46006) and to cover the exposed ground (01)
cf. leg (03 32002)
NOTE Usually of timber (01).
03 46005
sprag
03 46006
heading head tree
transverse member, part of a frame (01), in the soffit (01) of a heading (03 41005), that supports the ground (01), head boards (03 46007) and poling boards (03 26029)
03 46007
head board
03 46008
face board
board that supports a tunnel face (03 42019)
03 46009
byatt
biatt
temporary transverse horizontal member to support a deck (01), walkway (01) or guarding (01) in an excavation (01)
03 46010
arch rib
structural member (01) with the profile (01) of a tunnel (01) that supports ground (01) or tunnel lining (03 42005)
03 46011
benk bar
longitudinal corrugated steel plank to support ground (01) or tunnel lining (03 42005), or to forepole (03 44012)
03 46012
kicker
temporary horizontal member wedged across a tunnel (01) to distribute load (01) from one structural member (01) from a horizontal or raking strut (01) supporting face boards (03 46008)
03 46013
timber brob
timber (01) block fixed to a heading head tree (03 46006) to prevent a side tree (03 46003) moving inwards due to ground (01) pressure
03 46014
Yankee brob
03 46015
thrust wall
wall (01) that takes reaction from hydraulic jacks (12 56028) when pipe jacking (01) or thrust boring (01)
NOTE Usually temporary.
03 46016
tunnel head tree
upper horizontal member of a horse head (03 46001)
03 46017
roof board
03 46018
side board
length of timber (01) placed longitudinally between side trees (03 46003) to support the ground (01) at the sides of a timber heading (03 41009)
03 46019
lagging
timber (01) or steel plank placed horizontally between arch ribs (03 46010) to provide temporary support to ground (01) or tunnel lining (03 42005)
03 46020
slurry support
support to a tunnel face (03 42019) provided by slurry (01) under pressure in a compartment at the front of a tunnel boring machine (03 46029)
03 46021
support and transport system
03 46022
breast plate
horizontal timber (01) supporting vertical face boards (03 46008) that is itself supported by a tunnel shield (03 46032) or other structure (01)
03 46023
timber heading head tree
length of timber (01) supporting roof boards (03 46017)
03 46024
compressed air caisson
pneumatic caisson
caisson (01), with an air deck (03 36019) and air lock (01); the air in the working chamber is maintained above atmospheric pressure to exclude water
03 46025
wet caisson
03 46026
ring beam
03 46027
box caisson
caisson (01) closed at the bottom and open to the atmosphere at the top
03 46028
choker ring
bottom section of a caisson (01) including its cutting edge; of larger external horizontal dimensions (01) than the remainder of the caisson (01)
03 46029
tunnel boring machine
machine for advancing a tunnel (01) by rotary cutting
03 46030
shaft boring machine
boring machine operating downwards in a vertical direction
03 46031
earth pressure balanced tunnelling machine
tunnel boring machine (03 46029) with a cutting head that operates in a chamber from which wet spoil (03 23023) is removed by an enclosed archimedean screw (05 12122) of sufficient length (01) to achieve atmospheric pressure at its discharge end
03 46032
tunnel shield
mobile steel structure (01) supporting ground (01) at the tunnel face (03 42019) ahead of the tunnel lining (03 42005)
NOTE Usually cylindrical.
03 46033
Greathead shield
tunnel shield (03 46032) for hand excavation (01)
03 46034
open shield
tunnel shield (03 46032) that does not cover the tunnel face (03 42019)
NOTE The tunnel shield (03 46032) is normally used for soft ground (01).
03 46035
compartmental shield
large tunnel shield (03 46032) divided into compartments to provide access for excavation (01)
03 46036
jacking shield
tunnel shield (03 46032) for pipe jacking (01)
03 46037
roadheader
self-propelled machine for cutting and loading soft to medium hard rock (03 23027) in sections by means of a rotating cutter mounted exactly or transversely on a boom
03 46038
cutting edge
leading edge of a tunnel shield (03 46032) or a caisson (01) shoe
03 46039
hood
upper part of a tunnel shield (03 46032) that protrudes ahead of its body to provide overhead protection
03 46040
front shield diaphragm
curtain plate
diaphragm across the front of a tunnel shield (03 46032) or one of its compartments to control the ingress of unstable ground (01)