Annular shield takes slice around bore; lining reused with new segments; wet ground causes caving.
Tunnel enlargement on a London tube railway
Eng. News-Rec
Engineering News-Record ; 93 , n 24
1924
1 Fig.
Article (Journal)
English
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Enlargement of the city and South London railway tunnels
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Engineering Index Backfile | 1928
Engineering Index Backfile | 1928
The post office tube railway, London
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