Saves rock from air slake
For water tunnels, lining gives smooth surface
Adds to the structural strength.
Gives correct Shape to tunnel.
Withstands soil pressures in soft soils.
Supports loosened rock pieces during blasting.
Prevents water percolation.
Tunnels require lighting while construction and also
A light intensity of 260 lumens is said to be
For lighting Oils, Coals, Acetylene gas were used
formerly, but nowadays electric lighting is most
Need of Lighting Operation and Equipments Station
Switches, turnouts and passing tracks
Drilling and Mucking Zones
On Drill Carriages
Underground material supply and storage points
At all obstructions
Complete lighting after construction for utility of
Electric Lighting It is most commonly used for lighting in
tunnels and also is a most perfect source.
Furnish Steady and bright light
Does not consume oxygen
No offensive gases are given off
Easy for wiring and extension
Lamps may be easily adjusted for intensity