Trenchless Technology Center
Louisiana Tech University

Water Environment Research Foundation
http://www.werf.org
 
SEWER LATERAL REHABILITATION

Rehabilitation of defective sewer laterals restores impaired structural integrity and reduced hydraulic capacity of these pipes, as well as improves the leak-tightness of pipes and connections and hence eliminates or minimizes groundwater infiltration into the sewer system and/or exfiltration of wastewater into the surrounding soil. Rehabilitation also prevents root intrusion through defects into the pipes, which is a serious problem for many agencies.

Sewer laterals can be repaired or replaced either over their entire length or only in selected parts.

A number of trenchless rehabilitation methods have been developed for the purpose of lateral repair—the principal methods in use today being cured-in-place (CIP) relining products, replacement by pipe bursting, chemical grouting, and flood grouting. Robotic repairs are a relatively new method, whereas mechanical repair sleeves for sectional repair of laterals are less frequently used.

The lateral rehabilitation methods shown below are included in our database. Click on the link to see details.
METHODS:
CIP Relining
  CIP, Standard Liners
  CIP, Remotely Inverted Standard Liners
  CIP, T-Liners
  CIP, Short T-Liners
  CIP, Top Hats
Pipe Bursting
  Static Pull
  Pneumatic Bursting
Lateral Chemical Grouting
  Grouting, Mainline Packers
  Grouting, Push Type Packers
Flood Grouting
Robotic Repairs
  Robotic, Pressure Applications
  Robotic, Non-Pressure Applications
Mechanical Repair Sleeves
Pipe Bursting

Lateral bursting is a method in which a cone-shaped tool (bursting head) is forced through an existing lateral pipe fracturing it while simultaneously a new replacement pipe is pulled in. The replacement pipe is usually an HDPE pipe, although other pipe types can also be used. Either a whole lateral is replaced or a part of it.

The method offers a new pipe and thus a permanent repair. Root problems are eliminated in the future. Lateral pipe can be upsized. The lateral needs no pipe cleaning or root removal, and can eliminate small sags. The method is very suitable for badly damaged pipes (the more cracks the easier to burst) but is not suitable for deep laterals where excavation of pits would be difficult or in laterals with many bends where multiple pits would be required for one lateral. Lateral bursting can be difficult in hard clays with high groundwater lever or in pipes previously repaired with metal clamps. Access to private property is required and may be an issue.

Lateral bursting can be carried out as (1) static pull or (2) pneumatic bursting.

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