Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 - The New York Tunnel Extension of the Pennsylvania Railroad. - The East River Tunnels. Paper No. 1159 by S. H. Woodard;Francis Mason;James H. Brace
page 15 of 93 (16%)
page 15 of 93 (16%)
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the one below 6 in. The water-proofing was covered by a 1-in. mortar
plaster coat, after which the concrete of the 4-ft. inverted arch was placed. While the water-proofing and concreting were being done, the air pressure was kept at from 30 to 33 lb. per sq. in., the full hydrostatic head at the cutting edge. After standing for ten days, the air pressure was taken off, and the removal of the roof of the working chamber was begun. The water-proofing was done by the Union Construction and Waterproofing Company. TABLE 1.--RELATION OF THE FINAL POSITION OF THE CAISSONS TO THAT DESIGNED. ================================================================ LOCATION.| LONG ISLAND CITY. | ---------------------------------------------------------------- Shaft. | North. | South. | ---------------------------------------------------------------- Corner. | High. | East. | North. | High. | East. | North. | ---------------------------------------------------------------- Northeast|0.21 ft.|0.08 ft.|0.05 ft.|0.32 ft.|0.15 ft.|0.28 ft.| Northwest|0.22 " |0.08 " |0.02 " |0.00 " |0.15 " |0.12 " | Southwest|0.27 " |0.14 " |0.02 " |0.18 " |0.45 " |0.12 " | Southeast|0.23 " |0.14 " |0.05 " |0.39 " |0.45 " |0.28 " | ================================================================ ============================================================================= LOCATION.| MANHATTAN. | ----------------------------------------------------------------------------- Shaft. | North. | South. | ----------------------------------------------------------------------------- |
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