Underground Construction - December 2019 - 15

Experience
Superior
Performance
The first bed was 16 by 267 feet with 72 chambers. It has a total
installed volume capacity of 12,452 cubic feet of water, while the
second bed is 23 by 100 feet with 42 chambers has 7,428 cubic feet
of installed capacity. Each has 12 feet of cover. The chambers
are made from an engineered grade of impact-modified
polypropylene copolymer and designed for a 75-year service life.
Each MC-3500 chamber, without end caps, measures 90 inches
long by 77 inches wide and 45 inches high and has an installed
volume of 178.7 cubic feet of water. ADS N-12 18-inch diameter
high-density polyethylene (HDPE) pipe was used to connect
the chambers.
According to Daniel Currence, P.E., director of engineering for
the Drainage Division of the Plastics Pipe Institute Inc. "because
Tulsa granted a waiver specifically for the use of thermoplastic pipe
at the Gathering Place, the project was able to be under budget
as compared to using concrete structures and pipe. The use of
thermoplastic pipe and structures made it possible for the landscape
architect to make on-site changes after the drainage system was
installed. These changes could be readily accomplished with a small
crew using even hand tools to change and move the pipe, and with
as little disruption to the nearly finished landscaping."
"Another nice thing about using plastic in this job was doing the
many changes after it was installed. It was a lot easier using plastic
pipe than it would have been with concrete pipe," Egge stated. "It
was the same way with the Nyloplast structures."
"In a lot of places, the architect would come out, look at the way
the landscaping was done and say, 'it doesn't feel right'. It was really
handy to be able to take out, cut the pipe, put in a fitting, adjust it
and adjust the structure to the right height you wanted."
Generally, there were two or three Sherwood crews onsite, each
with an operator, a foreman plus three laborers. "Because of the pipe
we used, we could have a smaller crew. And second, the equipment
didn't have to be nearly as big," he continued. "This also helped a
lot because we were in such confined areas doing the changes. We
needed to use small equipment so we could get in and out. For a lot
of the change orders, because of the pipe and size and weight of it,
we could actually go in by hand without much equipment and make
those changes without destroying major areas of the landscape." *
The Plastics Pipe Institute, Inc. (PPI) is the major North American trade
association representing all segments of the plastic pipe industry and is
dedicated to promoting plastic as the materials of choice for pipe and conduit
applications. PPI is the premier technical, engineering and industry knowledge
resource publishing data for use in the development and design of plastic pipe
and conduit systems. Additionally, PPI collaborates with industry organizations
that set standards for manufacturing practices and installation methods.

XTR Reamers
Inrock's XTR reamers provide a modular,
re-usable platform in sizes ranging from 28"
to 60" and accept INROCK's proprietary Milled
Tooth, Standard TCI, or Premium TCI cutters
specifically designed for HDD. XTR provides
flexibility and consistent performance
to get the job done.

For more information,
call 1 (877) 2 INROCK or visit www.inrock.com
UConOnline.com | DECEMBER 2019

15
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Underground Construction - December 2019

Table of Contents for the Digital Edition of Underground Construction - December 2019
