. Shield and compressed air tunneling . V^AiS^t- R ,/,• u a^ ^ NOrE:MoBo/hfobe OA<SwtKVl__Jll_li /* ranoved except in keu ^^9©^ Section? [) IT E3jas< ir Busnmq-Casrlron A-B. ling- FiG. 134.—Method of reinforcing broken cast iron lining segments by meansof turn-buckles. With this design the bolts need not be removed in order toplace the turn-buckles. 9. Decay of Cast Iron Lining.—As a rule, cast iron tunnel hningis not readily subject to corrosion, although it may be affectedlocally by water heavily charged with sewage, acids, or trade wastes,which may enter between the uncoated joints of
. Shield and compressed air tunneling . V^AiS^t- R ,/,• u a^ ^ NOrE:MoBo/hfobe OA<SwtKVl__Jll_li /* ranoved except in keu ^^9©^ Section? [) IT E3jas< ir Busnmq-Casrlron A-B. ling- FiG. 134.—Method of reinforcing broken cast iron lining segments by meansof turn-buckles. With this design the bolts need not be removed in order toplace the turn-buckles. 9. Decay of Cast Iron Lining.—As a rule, cast iron tunnel hningis not readily subject to corrosion, although it may be affectedlocally by water heavily charged with sewage, acids, or trade wastes,which may enter between the uncoated joints of the matter of so-called graphitization of cast iron is also worthyto be considered. Sometimes pieces of iron buried in water orearth, including recently laid cast iron water pipe, have beenfound completely graphitized; the iron has disappeared, leavingcarbon in the form of the original casting, but without anysubstance or strength. Although we know of no case in whichcast iron tininel lining has been so affected, it maj- not alwaysbe immune from it. Perhaps some compositions of cast ironare more subject to it than others, and if so, the selection ofthe co
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Keywords: ., bookcentury1900, bookdecade1920, bookidshieldcompre, bookyear1922
