Pipes laid by means of Mangnall-Irving system of thrust \ill\oring, consisting of pushing solid pilot head from pit dug at one side of road or other obstacle to be crossed, until it comes out in another pit dug at other side of obstacle.
Sewer pipes laid by thrust boring
Engineer
Engineer ; 141 , n 3671
1926
3 pages
3 Figs.
Aufsatz (Zeitschrift)
Englisch
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