. Engineering and Contracting. 102 I ENGINEERING-CONTRACTING Vol. XXXIII. No. 5. reached where the top of the rail would beabout 90 ft. below mean high water, this loca-tion giving sufficient cover over the tunnelsto insure stability and guard against the possi-bility of shipwrecks settUng on the this point to the portal an ascendinggrade of per cent was adopted, which gave cided to support the tracks on screw-pilescarried through the lining of the tunnels, asoriginally proposed by the writer. In order to know something of the capacityof the screw-piles in the actual material
. Engineering and Contracting. 102 I ENGINEERING-CONTRACTING Vol. XXXIII. No. 5. reached where the top of the rail would beabout 90 ft. below mean high water, this loca-tion giving sufficient cover over the tunnelsto insure stability and guard against the possi-bility of shipwrecks settUng on the this point to the portal an ascendinggrade of per cent was adopted, which gave cided to support the tracks on screw-pilescarried through the lining of the tunnels, asoriginally proposed by the writer. In order to know something of the capacityof the screw-piles in the actual material to bepassed through, it was resolved to test caisson was sunk at the end of one of the screw-pile, having a shaft 30 in. in diameterand a blade 5 ft. in diameter, was loaded with000,000 lbs. with the result that, for a month—the duration of this loaded test—there was nosubsidence. Again, and after the iron tunnel lining hadbeen constructed across the river, tests were. Workinir Position LONGITUDINAL SECTIONS i. ELEVATIONS,TUNNEL LEVEL. PILES CENTRAL Placing Pile Section in PositionVertical Itam at top of etrokeBlocking & Hangers in position
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