Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 2417 An introduction to pipe jacking and microtunnelling 4 DESIGN AND CONSTRUCTION METHODS Microtunnelling machines and guided augers Fully guided machine remotely controlled from the surface, where man entry is generally not required. These microtunnelling machines are typically of two types, pressurised slurry and auger, both having face support capability: Guided auger boring machines can also be used for pipe installation in suitable ground conditions. Pressurised slurry As with the Pressurised slurry TBM, excavated material is transported from the face to the surface suspended in a slurry. Auger machine Where excavated material is transported from the face to the drive pit via a cased screw auger.