Underground Infrastructure - July 2023 - 27

Rehab Technology
Th e steel encasement pipe was successfully
put into position aſt er only a
few hours of work. Th e blockage under
the wall was cleared and the encasement
pipe was installed. Unfortunately, another
challenge was soon encountered.
Manhole 190WC is a point of infl ection
that redirects the pipeline to parallel
the drainage channel and is also a drop
connection point-of-entry to the interceptor.
Th e connections were not installed in
vertical alignment but were off set where
they connected to 190WC. Th is required
the TRA team to excavate the connection
to reconnect the manhole. During
the connection excavation, a signifi cant
(20-foot) void close to manhole 190WC
(FIGURE 3) was discovered, extending
under the drainage channel wall and private
driveway, jeopardizing the structural
integrity of both structures.
Th e prevailing hypothesis is the original
pipe collapsed behind the drainage
channel wall, forcing the fi ll above the
failed pipe and below the driveway to
wash into the interceptor, leaving a void.
Th ankfully, the void was discovered before
it collapsed causing damage to the
driveway and automobiles above. To fully
repair the interceptor and properly fi ll
and compact the void, the channel wall
and driveway were sawcut and removed,
and shoring was installed (FIGURE 4).
Th e original manhole 190WC was removed
and replaced with a polymer concrete
manhole that is resistant to corrosion
and erosion from grit and abrasives.
More challenges
Additional challenges were encountered
when reconnecting the downstream line
to the new 190WC manhole. Th e pipe
was disintegrating when a rubber boot
connection was att empted and a signifi -
cant amount of large debris (FIGURE 5)
was located in the line. Images showed
hanging joint gaskets, infi ltration holes,
and extensive exposed reinforcement.
Any level of vigorous cleaning to remove
mud and debris would present serious
risk to the existing pipe. Th e contractor
utilized a custom bucket (FIGURE 6)
made from a section of steel pipe with
a rebar " fi lter " welded on to catch large
rocks while allowing water and sediment
to pass through. Cables were att ached to
the front and back of the basket to drag it
back and forth and to prevent the basket
from gett ing stuck. Once the large debris
was removed, the pipe between manholes
190WC and 180WC was replaced
via pipe bursting.
Th ough HDPE DIPS DR-21 was suffi
cient for the depth of cover between
190WC and 180WC the summer of 2022
was fraught with material shortages. In
the entire United States, there was not
a 208-foot quantity of external diameter
of 30-inch HDPE DIPS DR-21 available.
Th ough it resulted in a smaller internal
diameter, the team obtained HDPE
DIPS DR-17.5 in quantities suffi cient to
complete the installation. Despite the
smaller internal diameter associated with
the stiff er DR-17.5, it was determined to
be suffi cient to carry the expected fl ows
in this segment of the system. Th e materials
and bursting cone came from New
Mexico and Chicago, respectively, and
were on site in less than fi ve days. Once
set-up was complete, the actual bursting
was fi nished in litt le more than an hour.
Flow was restored on July 1, 2022,
and fi nal site restoration completed the
concrete channel wall and residential
driveway. In addition, a new fence and
fresh landscaping were installed at the
impacted residential property.
Th e Walker-Calloway emergency
repair started out as an SSO event that
evolved into a bigger infrastructure challenge
as the investigation unfolded. Early
frustrations eventually yielded positive
results with some valuable takeaways.
Maintaining
good
relationships
with
suppliers, contractors and engineers is
valuable in an emergency and you must
remain fl exible with approach and mateFIGURE
6: Large debris
FIGURE 5: Custom bucket for debris removed
rials. Expect the unexpected and just keep
going. While the depths of the existing
pipe and the close proximity of house to
the work area presented signifi cant challenges,
proper planning by the engineering
team, professional execution by the
contractor and good quality control by
the inspectors led to a successful repair
of a deteriorated section of the WalkerCalloway
Interceptor System and the
legendary Caverns of Calloway. UI
FOR MORE INFORMATION
Flow-Line Construction, (214) 390-2848,
fl ow-lineconstruction.com
Circle C Construction (pipe bursting),
(817) 383-2119
FIGURE 7: Final site restorations
UndergroundInfrastructure.com | JULY 2023 27
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Underground Infrastructure - July 2023

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

Underground Infrastructure - July 2023 - 1
Underground Infrastructure - July 2023 - 2
Underground Infrastructure - July 2023 - 3
Underground Infrastructure - July 2023 - 4
Underground Infrastructure - July 2023 - 5
Underground Infrastructure - July 2023 - 6
Underground Infrastructure - July 2023 - 7
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