A "forward-looking" community in Quebec benefits from a modern sewer system.
Turning part of the former industrial park into one of the key components of Candiac Plaza is a pedestrian-oriented development (POD) of 2,000 units in Quebec, which is a rainwater system.
With a total area of 165,367 square meters (1,780,000 square feet), Candiac Square is located in the southern part of the Montcalm Industrial Park, close to one of the main entrances to Candiac, Quebec. The developer and the city government hope to revitalize the area through sustainable practices, with a focus on the benefits of nearby public transportation, as the site is 20 minutes away from downtown Montreal.
This $600 million project occupies the site of the Consumers Glass factory built in 1966. This residential community, nicknamed "Plaza Nature", combines a "green house" project with an area of 10,000 square meters (107,639 square feet) and more than 17,000 trees. The Central Park has its own rainwater recycling system.
The station is 20 minutes from downtown Montreal.
The system was designed by consulting engineers from SM Group International (now FNX-INNOV) and installed by A. & JL Bourgeois in two phases, from 2017 to completion in 2019. It consists of two parts: a pipeline network and a pair of underground rainwater retention devices. Both use high-density polyethylene (HDPE) pipes to meet the rainwater management requirements of the municipal and provincial governments.
For the first part of the rainwater network, Bourgeois installed 1,200 mm (48 in) diameter HDPE pipes over 630 m, and 15 chimney-style 900 mm (36 in) diameter manholes for direct welding to the pipes. Other pipes are also used for pipes with diameters ranging from 450 to 1,500 mm (18 to 60 inches).
Candiac Plaza was built on former industrial land.
The engineer specified corrugated HDPE pipes from Soleno in Quebec City. This meets the requirements of the American Society for Testing and Materials (ASTM) F405 Standard Specification for Corrugated Polyethylene (PE) Pipes and Fittings and F667 Standard Specification for 3 to 24 Inch Corrugated Polyethylene Pipes and Fittings; Canadian Standards Association (CSA) B182.8, PVC launch Piping and fittings; and American Association of State Highway and Transportation Officials (AASHTO) M 294, a standard specification for corrugated polyethylene pipes of 300 to 1500 mm (12 to 60 inches) in diameter.
In order to treat the retained water, an AS-10 Aqua-Swirl hydrodynamic separator was added at the end of the pipe before connecting to the urban rainwater drain. HDPE pipes over 1,290 m (4,232 ft) form this rainwater network.
For each of the two 16-row retention systems, nearly 480 HydroStor HS180 chambers were installed on the stabilized geogrid and then surrounded by clean stones covered with TX-90 geotextile. The first reservoir is designed for heavy rain events and can store up to 2,505 cubic meters (88,463 cf) of water, while the second can store up to 2,475 cubic meters (87,403.8 cf) of water. A waterproof geomembrane and two protective geotextiles were installed in the two excavation areas, 35 m (115.7 feet) wide and more than 66 m (216.5 feet) long.
Ease of installation is the key to this project.
The Plastic Piping Association (PPI) of the trade association reports that the polyethylene (PE) resin produced for pipes has a good strength-to-weight ratio, is easy to handle, and will not be degraded by soil, chemicals, environmental water, and moisture to prevent corrosion or growth. rust. Since HDPE is non-conductive, it is not affected by electrochemical-based corrosion processes caused by electrolytes (such as salts, acids, and alkalis).
In addition, HDPE pipes are not susceptible to biological attack or tuberculosis, resist biological clogging and maintain a high and consistent flow rate throughout the life of each system.
"HDPE can resist corrosion, abrasion, deicing salt and vibration, ensuring the resilience of the infrastructure," said Daniel Currence, engineering director of PPI's drainage department. "This rainwater channel system in Candiak Square has a long service life."
The material is also easy to install.
“HDPE products are light in weight and easy to handle, and do not require special equipment such as cranes, so installation is easier and faster,” Currence said. "Compared with traditional concrete pipes, the length of Solflo Max pipe reduces installation time and the number of joints between pipe sections."
Since Candiac Square's HDPE manholes do not require oversized dimensions, they save a lot of money in terms of purchase, excavation and installation costs. Their welding design makes it possible to assemble the entrance and exit in the factory, so it is effective to make connections on the construction site. Another feature of the manhole is its smooth outer wall, which prevents vertical movement during the freeze-thaw cycle.
"This storm sewer system can extend the lifespan. The community has higher and higher expectations for sustainability and resilience."-Daniel Currence, PE, PPI.
Using a waterproof bell to provide powerful joints and O-rings or integrated gaskets, Soleno's slightly oversized pipes are quickly and easily assembled together with clamps to verify the installation quality and the nesting depth network of the sewer.
The HydroStor HS180 fixing system is made of polypropylene (PP) and HDPE and is easy to install due to the low weight of the chamber. Designed for projects with large capacity or limited space, each room can store 5.1 cubic meters (180.1 cubic feet) of rainwater, making it more cost-effective than alternatives by greatly reducing the area of the tomb.
The installation of the geogrid helps to ensure a strong and stable foundation at the bottom of the chamber by distributing the linear working load over a larger surface area. The Aqua-Swirl treatment device is installed at the outlet of the sewer to recover suspended solids, oil and grease. Direct access to the device from the surface facilitates regular maintenance, and there is no need to work in a confined space.
"Today, communities have higher and higher expectations for sustainable and resilient products," said David M. Fink, President of PPI. "As an association, we and our members believe that HDPE pipes can meet or exceed these expectations. This practical, long-life rainwater pipe network is made entirely of HDPE products and has won the favor of Candiac City. The residents of Candiac Square will benefit. for many years."
Steve Cooper is the managing director of SCA Communications, which provides public relations (PR) for PPI. For more information, please visit www.plasticpipe.org.
This article was published in the November/December 2021 issue of Consulting Engineers Canada.
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