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Janssen Process CemConex for Joint repair

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Injection process for the repair of faulty joints in sewer

The mineral injection material CemConex consists of 2 components, which are individually mixed in suspension above ground and mixed in the packer just prior to the actual injection at the repair spot. Before their final mixing the individual components have a long pot life (more than 2 hrs.). After final mixing before injection they cure within a very short time (approximately 3 minutes). Thus the packer can be advanced to the next joint shortly after the injection action. This allows for a continuous and quick operation.

The rehabilitation process is remotely controlled from a service vehicle under continuous cctv observation. Cables and hoses are fed through the manholes. Under normal circumstances the existing wastewater in the sewer does not need to be diverted.

After remotely positioning the packer at the damaged joint the injection mortar is pressed all the way into the surrounding soil and bedding. The connection is sealed permanently and inherently stable. Injection pressure and the amount of material are automatically recorded.

CemConex equipment
CemConex injection packer
control room
undug section after rehabilitation in clay and concrete
rehabilitated joint outside
rehabilitated joint inside

City benefits

  • no reduction in cross section
  • permanent economical rehabilitation
  • seals tightly against in- and exfiltration, root growth and fills voids and cavities
  • low material cost
  • material environmentally sound
  • short repair time
  • no by-pass needed due to the open packer
  • rehabilitation from manhole to manhole

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