Pipe Jacking

Pipe Jacking is a technique for installing a pipeline through a horizontal bore created by operators working in a jacking shield and hydraulically jacked from a drive pit. Pipe Jacking is a man entry technique and pipes are typically of 900mm in diameter or more. The jacking shields consists of steel cylinder from which operator’s carry out excavation by hand held tools. Spoil is hauled to surface by means of trolley or suction systems. When enough excavation is done in front of the tunnel, pipes are pushed forward by hydraulic jacks, which are located in thrusting pit. When all length of a pipe segment is entered in to the ground, jacking cylinders are retreated and a new pipe segment is added to the string at the drive shaft. Being the simplest technique, Pipe Jacking is only applicable in stable ground without saturated soils. The drives are limited in length and steerling is done manually.

Advantages

  • Minimal Surface interference. Therefore, noise level and traffic disruptions are minimized.

Limitations

  • Drive and reception shafts are required.
  • Length depends on soil type.
  • Nor applicable below water table.
  • Small diameter pipes cannot be installed. Steering is manual.

Technical Data

  • Lengths 40-60 meters
  • Diameters 900mm (36″) and above
  • Materials RCP,Stelland Vitrified Clay

Pipe Jacking Procedure

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