Used at concrete linings of dam derivation,underground metro,highway and railway bored tunnels.
For small tunnel formwork,replacing can be done with available tractors,loaders.etc.Raising and lowering can be done manually
Moving,raising,lowering for bigger tunnels is done by hydromechanical equipment.
Formwork is steel faced,has windows and sliding valves for pumping concrete.
Has surface vibrators attached to formwork,type and quantity calculated beforehand.Energy for vibrators are supplied by convertors.