. Shield and compressed air tunneling . ge. A proper design of switches andturn-outs should be used and properly laid. The rails should beof sections of not less than 25 to 30 lb. per yard. Economy inthe track construction will soon be eaten up by delays due tocar off the track and general demoralization of the trans-portation. The track should be spiked to the floor beams andnot to the planking, because the flooring can then be removedwithout disturbing the track. (B) The Cars 62. Use of Cars.—The cars used in tunnel transportation aremainly used for taking out the excavated spoil and for bri
. Shield and compressed air tunneling . ge. A proper design of switches andturn-outs should be used and properly laid. The rails should beof sections of not less than 25 to 30 lb. per yard. Economy inthe track construction will soon be eaten up by delays due tocar off the track and general demoralization of the trans-portation. The track should be spiked to the floor beams andnot to the planking, because the flooring can then be removedwithout disturbing the track. (B) The Cars 62. Use of Cars.—The cars used in tunnel transportation aremainly used for taking out the excavated spoil and for bringingin the lining. Special types of cars are used for each purpose. 63. Muck Cars.—The cars used for taking out the spoil, orthe muck cars, should be of rather small capacity. The excava- ILAXT AM) KQIIIMENT 11)5 tion is not carried out on a large scale as it is with a steam shovelin a raihoad cut and the cars have to be handled by man powerat and sometimes through the shield as well as through the locks. /./,V//M/////^V/////////,.
Size: 2279px × 1097px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidshieldcompre, bookyear1922
