HOBAS Pipe Systems for Trenchless Applications

Pipe Jacking

When pipelines are laid in densely populated areas, protected natural habitats, or beneath heavily frequented roads, jacking is often the least disruptive solution. Thanks to centrifugal casting, HOBAS Gravity as well as Pressure Pipes can be designed and manufactured with the compressive strength and wall thicknesses required for the necessary jacking forces.

With their smooth, almost non-absorbing exterior surface, tight outer-diameter tolerances and comparably light wall structure, HOBAS CC-GRP Jacking Pipe Systems experience the lowest necessary jacking loads in the industry, high installation rates, and are suitable for very long and also curved drives. HOBAS De 3000 Pipes have been jacked e.g. on a more than 900 meter long curved alignment in one single drive.

Apart from providing excellent hydraulic properties the mirror-like smooth inner surface is easily maintained and disinfected adding jacking to the installation portfolio of potable water lines where hygiene plays a major role.

The pipes’ small outside to inside diameter ratio provides an array of advantages. For instance, smaller jacking machines are required for the pipes, which means lower equipment and lease costs, less excavation material, larger pipe capacity.

Adequate joints and fittings for every application ensure a complete tight system.


Curved Pipe Jacking

For economic and environmental reasons, curved pipe jacking is increasingly specified by designers and clients. Dividing the drive into straight sections with bends located inside the shafts necessitates the use of more numerous and in many cases deeper pits. With curved drives the quantity and the depth of these jacking pits can often be optimized.

HOBAS CC-GRP Jacking Pipes have unique benefits when it comes to curved alignments. Their high compressive strength and elasticity are here especially favorable features. Thanks to the elasticity of the GRP material, HOBAS Jacking Pipes react to eccentric loads by means of spigot deformation. The pipes therefore remain in full contact to each other without timber packing rings. This allows for an optimal transmission of jacking forces and higher steering precision.

All HOBAS Production Facilities in Europe are certified to the jacking standard ISO 25780 by TÜV Süd.

HOBAS Benefits

  • curved alignment
  • lower machine costs
  • less excavation material
  • higher installation rates
  • longer drive lengths
  • fewer necessary shafts
  • higher steering precision
  • lower necessary jacking forces
  • excellent hydraulics
  • less maintenance
  • long lifetime


Rehabilitation by Relining

When spot repairs on deteriorated pipelines are no longer feasible, authorities are confronted with having to decide between rehabilitation and pipe replacement. The latter solution has the disadvantage of being very costly and disruptive to urban areas where the largest sewer networks are located.

Relining is a process whereby the existing pipeline, instead of being replaced, is relined with a new pipe of a smaller diameter to refurbish the original pipe for continued service. Being light in weight, corrosion resistant, easily jointed due to push-together joints and rigid to resist grouting forces, HOBAS CC-GRP and NC Line Systems are ideal for this application. A maximal mass flow is above all ensured thanks to the smooth inner surface (small roughness coefficient) and the relatively light wall structure of HOBAS Pipes.

Scope of Supply
Outside Diameter [De] 272 - 3600 mm
Nominal Pressure [PN] 1 - 10 bar
Nominal Stiffness [SN] 32000 - 1000000 N/m²
Supplementary Products - Practical push-to-fit couplings
- Up- / Downstream Pipes for Intermediate Jacking Stations
- Lubrication - Injection Nozzles
- Manholes for Jacking Sites
- Relining with Standard Pipes and Non-Circular Profiles (NC Line)