Sewer Diversion Method Pipe JackingPipe Jacking methodIn a situation where the sewerage pipes have to be laid in deeper ground (3 to 7 meters), the pipe jacking method will be adopted. This method not only minimises the digging of the trench to lay the new pipes but also alleviates disruption to the public.1. To form the pipe jacking or pipe receiving station, a temporary shaft will be set up at the proposed new manhole location.2. The soil in the temporary shaft is excavated3. The pipe jacking machine is then set up at the base of the shaft. Upon confirmation of the alignment, the roller cutter at the face of the cutting head machine cuts the soil in front of it.4. The excavated soil is then fed to the crusher through a pipe and further crushed to smaller pieces, after which it is transported up to the ground surface in a fluid form using a slurry pump.5. The excavated soil in slurry form is treated by passing it through a number of screens.6. The dry spoil is then removed from site, so as to keep the works area clean.7. The new pipe is lowered in sections behind the cutting head machine and gradually pushed behind the cutting head machine into the area excavated. The excavation and pipe installation cycle continues until the cutting head machine reaches the receiving station with the new pipeline laid behind it.8. A new manhole structure is then constructed in the receiving shaft.9. Once the manhole construction is completed, the temporary shaft is backfilled and surrounding area reinstated.10. Finally the manhole is cleaned and inspected by the relevant agency for handingover and commissioning of the new line.