Trenchless Technology Center
Louisiana Tech University

Water Environment Research Foundation

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.
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
Pneumatic Bursting

Pneumatic bursting uses repeated impacts of the bursting head driven by compressed air. The bursting head is a cone-shaped soil displacement hammer guided by a small pulling device to keep the hammer in contact with the existing pipe. The percussive action of the bursting head is similar to hammering a nail into a wall, where each impact pushes the nail a small distance farther into the wall.

Pneumatic bursting is more suitable in difficult soils (hard clays).

CompanyTT Technologies, Inc.
Product/System NameGrundo----?---®
Web Site
Product Material
Installationpneumatic bursting
Product Cure-
Lateral, Pipe TypeAny
Lateral Dia, Min4 in.
Lateral Dia, Max6 in.
Lateral Dia, TransitionYes
Repair in Lateral, Max150 ft
Mainline Dia, Min-
Mainline Dia, Max-
Repair in Mainline0
Bends in Lateral, 90sTwo 45 deg. One 90 deg at entry.
Offset of Joints, MaxAny
Lateral Protruding, MaxYes
Active Leaks (Heavy)
Lateral Cleaning
Cleanout (1 or more)No
Pit(s) Excavation
Entering Private PropertyYes (unless lower laterals only)
Lateral PluggingYes
Mainline PluggingYes (unless upper laterals only)
Structural RepairYes
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