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
Mechanical Repair Sleeves

Mechanical repair sleeves provide sectional repairs in laterals: short sections (18 in.) are typically repaired although sleeves can be overlapped if longer repairs are needed.

The method utilizes a stainless steel repair sleeve, which is mounted on a flow-through plug, inserted into the lateral pipe through a pit, pulled to the repair spot, and mechanically locked in place by applying a pressure to expand the plug. After the sleeve is securely locked in place, the plug is deflated and removed from the lateral. The method typically also includes chemical grouting to provide a water tight seal around the repair sleeve: during the plug expansion, the grout is released from slots in the wall of the sleeve to fill the annular space between the sleeve and the host pipe and to enter the soil.

The method is most suitable for laterals in overall good condition except on short sections where the pipe is severely cracked or even partially collapsed, and for pipes with offset joints. Excavation of pits is required and access to private property is needed.

CompanyLink Pipe Inc.
Product/System NameGrouting Sleeve™
Web Sitehttp://www.linkpipe.com
Product Material
InstallationPull-in & expand
Product CureGrout: ambient
Lateral, Pipe TypeAny
Lateral Dia, Min4 in.
Lateral Dia, Max12 in.
Lateral Dia, TransitionNo
Repair in Lateral, Max18 in.
Mainline Dia, Min-
Mainline Dia, Max-
Repair in Mainline0
Bends in Lateral, 90sNo
Offset of Joints, Max< 1 in.
Lateral Protruding, Max-
Active Leaks (Heavy)No
Lateral CleaningNo
Cleanout (1 or more)No
Pit(s) ExcavationYes
Entering Private PropertyDepends
Lateral PluggingNo
Mainline PluggingNo
Structural RepairYes
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