Tunnel and shaft solutions brochure - Humes

Segmental shafts
Where shaft diameters exceed the size of the one piece
ring '3.60 m ID', the segmental shaft system comes
into its own so that shafts of almost any diameter
can be constructed.
A ring consists of a series of ordinary segments which
have four edges that are perpendicular to each other
and two tapered segments (left and right) which have
one tapered end which allows for closing of the ring
by simply lowering the last (tapered right) segment
into position.
Number of segments per ring varies depending on the
shaft diameter (refer to Table 3 below).
Table 3 – Standard segmental shaft details
Internal
diameter
(m)
External
diameter
(m)
Height
(m)
Segments per ring
Ordinary Tapered
Mass per ring
(tonnes)
Mass per
segment
(kg)
4.50 4.90 1.00 5 2 7.36 1,050
6.00 6.45 1.00 7 2 10.78 1,200
7.50 7.95 1.00 8 2 13.37 1,340
9.00 9.50 1.00 12 2 17.80 1,270
10.50 11.00 1.00 12 2 25.40 1,820
12.50 13.15 1.00 14 2 32.80 2,050
15.00 15.75 1.00 16 2 44.50 2,500
Note:
Diameters up to 25 m are also available, contact Humes for availability.
14 Tunnel and shaft solutions
Figure 9 – Installing tapered segments to close the ring
Tapered left
segment
Tapered right
segment
Ordinary
segment