Compressed Air Work And Diving 1909
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CHAPTER VIII.
Tunnelling (continued).
Blackwall and Rotherhitiie.
The Blackwall Tunnel, 27 ft. external diameter, and the
Rotherhitiie Tunnel, 30 ft. external diameter, are the two
largest tunnels which have been constructed by means of
compressed air. The Blackwall Tunnel was starteel in
1891 and finished in 1897, the engineer being Sir
Alexander Binnie. The Rotherhithe Tunnel was starteel
in 1904 and finished in 1908 and the engineer has been
Mr Maurice Fitzmaurice, C.M.G.
Both these tunnels are for road traffic and have been
made by the London County Council. The Blackwall
gives a 16 ft. roadway and a footway 3 ft. in. wide on
each side, and the Rotherhithe a roadway, also 16 ft.
wide, and two footways, each 4 ft. 8J- in. wide.
The Blackwall Tunnel shielcl was 19 ft. 6 in. long
and 27 ft. 8 in. external diameter.* It was di vided
into twelve compartments by three vertical and three
horizontal divisions. The central division only extended
from top to bottom so that there were two compartments
at the top, four on the next two levels, and two at the
bottom.
In loose orrounel the front was closed in by shiitters
O J
* The Engineer, 21st May 1897.