Tunnel Boring Machines
 
Akkerman wheel machines range in size from 44“ (1118 mm) to approximately 128“ (3251 mm) in outside diameter and can be equipped with three types of cutter head:-
   
Dirt cutter head for clay, silt & sand
Carbide cutter head for soft to medium hard rock
Sand shelved for loose unstable soils
   
An optional closed face cutter head can be used for boring in most unstable ground conditions. It’s hydraulically operated doors prevent subsidence while excavating the ground.