CASE STUDY

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Aluminum Tunnel Liner Plate Reline, NL

Due to the high costs of replacing failing infrastructure, interest is growing for the rehabilitation of existing steel and concrete structures in a variety of different geometries. Relines with Tunnel Liner Plate offer superior solutions because they are often constructed more quickly than other building alternatives, can provide significant costsavings in locations where structures have a high amount of ground cover, and cause the least amount of disruption to the general public.

OWNER Public Works CanadaCONTRACTORS General - J-1 Contracting Ltd. Sub - S&H Construction CONSULTANTS Meridian EngineeringLOCATION Terra Nova National Park, NL

The host Multi-Plate structure with aluminum tunnel liner plates laid at opening

CASE STUDY

Call 1-800-565-1152 or visit armtec.com

CASE STUDY

Threaded grout port

Background:In the Fall of 2012, Armtec was asked by Public Works Canada to visit a site in Terra Nova National Park in EasternNewfoundland and assess thepossibility of rehabilitating a 47-year old structure, installed in 1965 using Armtec Multi-Plate. At the site meeting it was determined that a rehabilitation with Tunnel Liner Plate would be the right solution and aluminum plate was selected because of the long service life it would provide. Because of its locationat the bottom of a steep embankment, accessibility to the existing culvert was a challenge. The portability of the product made it a great solution for the unique geography of the project. Tunnel Liner Plate, which only Armtec manufactures in Canada, could beshipped to the site and hand-carried in segments weighing only 9-14kg through the length of the existing host structure for erection. The alternative choice would have been to incur significant construction costs in building the access infrastructure, which could also negatively impact the park’s environmentally sensitive area.

Design: After Public Works Canada deter-mined that Tunnel Liner Plate would be most suitable for the installation, Armtec’s engineering team quickly prepared a detailed set of drawings and specifications for Public Works Canada to review. In the summer of 2013, a tender was called for the work which included Armtec’s drawings and specifications in the tender package.

Installation:As the only manufacturer of TunnelLiner Plate in Canada, Armtec’sNewfoundland team secured the business in late 2013, began installation of the structure in May 2014, and completed the project the following month. The work involved relining the existing 2,430mm diameter Armtec Multi-Plate which was installed under 8m of cover with a new 2,250mm diameter Aluminum Tunnel Liner Plate.During construction, the site wasvisited by a number of parties such asEngineering Consultants, Departmentof Transportation Engineers, and Public Works Engineers. Given the unique challenges posed by the

project, there was tremendous interest in Armtec’s solution, so much so that one worker proposed (tongue-in-cheek of course) charging every visitor a toll to see the project! Feedback from visitors to the site was overwhelmingly positive and Armtec’s products generated a substantial amount of interest.

The installation of Armtec’s Aluminum Tunnel Liner Plate was a successful project for Public Works Canada and caused little disruption to the visitors of Terra Nova National Park. More importantly, there was little environmental impact to the area. To learn more about this project or for more information on Armtec’s various Tunnel Liner Plate options, please speak with an Armtec Representative or visit our website at www.armtec.com.

“Given the unique challengesposed by the project, there wastremendous interest in Armtec’s[Tunnel Liner] solution, so muchso that one worker proposed(tongue-in-cheek of course)charging every visitor a toll tosee the project!”

Rick Hobbs, Owner, S&H Construction

CASE STUDY

Armtec is a leading national manufacturer of a comprehensive range of infrastructure products and engineered construction solutions for customers in a diverse cross-section of industries. With operations coast to coast, we are a trusted partner for transportation, public works, forestry, oil and gas, and mining operations throughout the country and abroad. Since 1908 our commitment to quality, customer service and innovation has set the benchmark in the Canadian drainage and bridge landscape.

Call 1-800-565-1152 or visit armtec.com

1) 10" pump at upstream end, allowed Multi-Plate to be completely dewatered.

2) Existing Multi-Plate was cleaned of all debris and rocks.

3) Plates were placed in bundles atupstream end of culvert by excavator.

4) Plates were brought into thestructure by hand, according to platelayout per ring.

5) Crew of 3 assembled 5 plates inside structure. Final top plate was then put into position to complete the first ring.

6) 2x4 was used as blocking to ensure uniform spacing and proper alignment.

7) Second ring was assembled with 5 plates and moved into place next to first ring. Once in place, final top plate was placed into position. Each ring was bolted to the previous ring through an inward projecting vertical flange. This allowed assembly to be completed from inside the host structure.

8) After three days, crew of three was able to complete 20 rings per day.

9) Once all rings were completed, bolts were tightened to the specified torque of 115-135 foot pounds.

10) Grouting was completed using aportable concrete pump. The groutmixture was a freely flowing mixturewith an approximate 6" slump that was pumped through 2" grout plugs located throughout the structure. Grout was placed in 3 uniform lifts along both sides of the pipe while ensuring the design diameter of the reline pipe was held at all times.

11) Grout was injected into the groutports and the ABS plug was secured to prevent the grout from flowing out.

12) Sand bags were placed aroundthe structure inlet and outlet ends toprevent grout from flowing out atthe ends.

Project Overview:

STATS

• Plate Weight: 9-14kgs

• Ring Width: 500mm

• Total Rings Used: 87

Installation completeMonitoring the grout process

Injecting grout into the grout ports