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Jumbo drilling rig - TWS
Excavating a tunnel is usually done by the combination of uni-function machines (for drilling the blasting holes, erecting the steel support or setting in rock bolts, spraying concrete and other operations).In the NATM tunnel excavating operation, when the uni-function machines are placed in the direction of the tunnel, the overall length is over 600m, maximum, to reduce the effective tunnel width excessively, require many hours for moving those machines forward and backward and cause accidents due to the contact, insertion, etc.
Then, in recent years, a tunnel work station (tunnel driving plant) in which the heading point of a tunnel is used three-dimensionalls to reduce the number of machines for the intensive areas of operation, have seriously been investigated. As a result, a multifunction drilling machine on which other machines or devices are installed and which is different from a usual gantry jumbo, is being produced.
Recently the above-mentioned intensive drilling machine is named Tunnel Work Station (TWS) and it is being developed by the endeavors of the persons concerned.