Compressed Air Work And Diving 1909
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COMPRESSION BY RISING WATER. 77
which are flush with the concrete. On these the shield
slides. With such an arrangement the shield can be
kept at the proper level without difficulty, but placing
it involves getting out in front of the shield, which is
a disadvantage.
o
TABLE XIII.
Shoiving Compression, by Rising Water, of Air in top of a Tunnel on the
Level tv hen Converted into a “ Diving Bell” by a Screen reaching half-
way down. This table cannot be used for a tunnel on a gradient.
Initial Pressure in Pounds per Square Inch. Height of Water up Screen in terms of the Diameter of the Tunnel.
<ro 5HT 4 5 2Ö- n 2 <T 7
Resultant Pressure in Pounds per Square Inch.
0 2 '■) 9 14 23 37 63
5 8 12 17 24 36 5a 90
10 14 18 25 34 48 72
15 19 25 33 44 61
20 25 32 41 54
25 .31 39 49 64
30 37 45 57
35 42 52 65
40 48 59