Example: tourism industry
Mechanised Shield Tunnelling
Found 1 free book(s)An introduction to pipe jacking and microtunnelling
pipejacking.orgmechanised drives 4d) ... in other forms of tunnelling. Shields, excavation and face support can be provided for a wide variety of ground ... steerable shield, which must be frequently checked for line and level from a fixed reference. For short or simple pipe jacks, these