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
Static Pull

Static pull uses a heavy-duty pulling device to simply pull a bursting head through the old pipe. For replacing ductile pipes (lead, galvanized iron, cast iron, etc.), a pipe splitting head is used. This is a variation of the static pull head, with blades that slice through the pipe and split the pipe open rather than burst it into fragments as the head is pulled through the pipe.

Static pull is more suitable in very shallow laterals where the vibrations could damage the driveways or other objects, and in sandy soils with high groundwater level (where pneumatic tool can get stuck due to soil liquefaction from vibrations). Most lateral busting is performed as static pull.

CompanyTric Tools, Inc TT Technologies, Inc.
Product/System NameTric Lateral™ Grundotugger®
Web Sitewww.trictrenchless.com www.tttechnologies.com
Product Material
Installationstatic pull static pull
Product Cure- -
Lateral, Pipe TypeAny
Lateral Dia, Min2 in. 4 in.
Lateral Dia, Max6 in. 6 in.
Lateral Dia, TransitionYes Yes
Repair in Lateral, Max300 ft 150 ft
Mainline Dia, Min- -
Mainline Dia, Max- -
Repair in Mainline0 -
Bends in Lateral, 90sOne Two
Offset of Joints, Max2 in Any
Lateral Protruding, MaxYes Yes
Active Leaks (Heavy)Yes Yes
Lateral CleaningNo No
Cleanout (1 or more)No No
Pit(s) ExcavationYes Yes
Entering Private PropertyDepends Depends
Lateral PluggingYes Yes (4 hrs)
Mainline PluggingDepends Depends
Structural RepairYes Yes
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