Question

similarity and differences between tunneling technology roadheader, tunnel boring machine and drill and blast

Answer 1

Similarities

• All are excavating equipments or techniques.
• All of the techniques are basically used to excavate vertical surfaces .

Differences

Roadheader

• Consists of a boom mounted cutting head , loading device and a crawler travelling track.
• The excavation is usually done on vertical surfaces like walls , it is done by a rotating drum which has spikes so that it tears through the surface.
• The arm with the rotating drum , can be controlled upto a certain angle making it a precise excavation device.

Tunnel Boring Machine

• It is an efficient tunneling device .
• It does not have a controllable arm .
• It is mainly used to make tunnels.
• It is expensive.
• It can be used to make uniformly round tunnels .
• Ground vibration is low when using Tunnel Boring Machine for excavation of tunnels.

Drill and Blast

• Method of using explosives and drill for excavation.
• Ground vibration is high when Drill and Blast technique is used for excavation.
• Requires highly skilled people to operate .
• Proper structure support methods are important when using this technique for tunneling.
• Site preparation time is low.

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