Underground Infrastructure - February 2023 - 42

Solving Infiltration
Problems After Structural
Rehabilitation.
By: NASSCO Member and ICGC Chair John Manijak, Hoerr Construction, Inc.
The process of sewer system Inflow & Infiltration
(I&I) removal requires a holistic approach to truly be
effective. Specifically, all four points of infiltration
must be addressed to achieve ultimate success.
These four points are manholes, mainline joints,
service connections and service laterals.
a pipe and extends the life of the original host pipe
for decades. However, since the original pipe
remains in place, cracks, fractures, failed joints, and
holes can remain. If there is no chemical or
adhesive bonding, then an annular space between
the host pipe and CIPP liner, if not a tight fit, may be
present, and water may still enter the host pipe,
flow within that space, and then reenter at
reinstatements and manhole terminations. However,
since NASSCO and other industry specifications
require a hydrophilic barrier at CIPP connections to
mitigate migration of infiltration in the annulus,
infiltration typically does not freely flow through the
annulus.
Nearly all municipalities are constrained by
budgetary limits for the annual amount of work that
can be performed and are forced to make the
decision to repair only certain items while leaving
the remainder neglected. Some concentrate only
on mainline structural solutions as a widespread
approach while others will tackle only segments
with known impending failure. It sometimes
becomes a balancing act of " How much can be
done right or right now? " versus " What are my
spending limits? " .
Returning to address I&I after a mainline structural
solution such as CIPP has been installed is a
decision that a lot of owners are facing. When a
mainline pipe is lined, it becomes a new pipe within
Sewer grouting is the process of eliminating
infiltration through the trenchless installation of a
chemical grout to the exterior of structures. When
performed at lateral connections in conjunction with
mainlines that have been lined with CIPP, grouting
can be used to stop infiltration at the
reinstatements.

Underground Infrastructure - February 2023

Table of Contents for the Digital Edition of Underground Infrastructure - February 2023

Underground Infrastructure - February 2023 - 1
Underground Infrastructure - February 2023 - 2
Underground Infrastructure - February 2023 - 3
Underground Infrastructure - February 2023 - 4
Underground Infrastructure - February 2023 - 5
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Underground Infrastructure - February 2023 - 52
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