HOBAS Manhole Renovation - As Good As New

Renovating existing manholes, shafts and structures in drainage systems is constantly gaining in importance. HOBAS supplies two systems that differ considerably from the technologies previously available in the market and therefore enable quite different results. The total number of manhole structures in Germany’s public sector is some 10 million. And about 1 million of them need to be repaired. This means renovation costs amount to approximately of 4 billion euros. There are two different techniques: manhole rehabilitation and the shaft-in-a-shaft process, to produce optimal, cost-effective results.


Shaft-in-Shaft Renovation

HOBAS Shaft-in-Shaft Renovation is a technique where a HOBAS Manhole is fitted inside the structure rehabilitated. This method does not only take given conditions into account (e.g. nominal width, depth, channel) but also means the old manhole does not have to be completely removed. The new manhole fully overtakes all static loads. 



  • Static loads all applied to the new manhole
  • High corrosion resistance and permanent leak tightness
  • Rehabilitation independent of dampness, leak tightness and structural design of old manhole
  • Small dimensions
  • Little excavation
  • Quick and easy installation
  • Low maintenance, long life

Manhole Rehabilitation

The Requirement for this process is a static-load-bearing manhole. HOBAS Rehabilitation  Manholes are modular systems. All the individual components are designed to fit through a standard manhole opening (De 625 mm). The process is a quick and easy way to rehabilitate leaking or corred manholes. In addition, the HOBAS Rehabilitation Manhole modular System can also be adapted to virtually every application.


Special Features:

  • Rehabilitation process: no trenchwork necessary
  • Simple installation (modular system)
  • Complete protection against corrosion and groundwater infiltration
  • Resistance to aggressive wastewater
  • No dependence on old manhole’s condition
  • Sensitive areas (e.g. pipe connections) permanently leak-tight