Underground Construction - August 2020 - 25

If none of the trenchless
renewal methods can be
employed (because of factors
such as shape, soil voids and
localized collapse, alignments,
size, joint settlements, hydraulic capacity problems), the pipe
might have to be replaced using
a parallel line installed by the
trenchless construction methods. In some cases, multiple
trenchless renewal methods,
or even a combination of opencut and trenchless methods,
might be considered. The latter
approach would apply when the
surface disruption associated
with conventional open-cut
technique could be tolerated.

Project details
To reduce emergency projects
and impacts to the travel-

ling public, departments of
transportation (DOTs) can
use spray-applied pipe linings
(SAPLs) to renew deteriorated
gravity stormwater conveyance conduits and culverts,
provided they are discovered
prior to loss of soil-structure
interaction. To implement this
new technology, the American
Association of State Highway
Transportation Officials'
National Transportation
Product Evaluation Program
developed a Technical
Committee for SAPLs.
The SAPL Committee consists of DOTs, manufactures
of resin-based material, and
manufactures of cementitious
based materials. An early
request from the DOT members was to ensure that the

spray-applied lining functioned
as a structural liner. However,
it was quickly realized that no
standardized structural design
methodology existed for this
technology. Manufacturers
utilize different design methodologies, with some using CIPP
ASTM F1216 methodology and
others using various classical
analytical structural design
equations developed for other
purposes. A gap in knowledge
was identified and preliminary
discussions for research among
the SAPL Committee members
took place.
The research needs statement was posted through Ohio
DOT's Research Program,
and the National Cooperative
Highway Research Program and
CUIRE were selected. The fund-

ing commitment was achieved
by Del., Fla., Minn., N.C., N.Y.,
Ohio and Penn. DOTs, and led
by Ohio DOT. Other DOTs are
encouraged to join, to expand
the research to their states'
particular needs.

Objectives and
methodology
The primary objective of
this three-year research is to
develop design equations for
structural renewal of gravity stormwater conveyance
culverts using SAPLs for both
cementitious and resin-based
materials, and for circular pipe
and pipe arch shapes with
spans larger than 36 inches.
Design equations developed
with this project will use loading, as detailed in AASHTO's

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UConOnline.com | AUGUST 2020

25
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Underground Construction - August 2020

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