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The City is preparing to begin tunneling for the Combined Sewage Storage Tunnel (CSST), the City’s second-largest infrastructure project with important environmental benefits and a key part of the Ottawa River Action Plan.
Approximately one year ago, the City put shovels in the ground at Chamberlain Avenue and Kent Street to create an access shaft to tunnel north. Now the 23-metre deep shaft is complete, and the tunnel boring machine (TBM), which will be used to excavate the tunnel, is being assembled underground for launch. Tunneling will begin later this fall.
The TBM will be 250 metres long once fully assembled, and will work as deep as 31 metres below surface, with up to nine people inside it. At the other end of the future North-South Tunnel, work is underway on the exit portal near the Ottawa River, where in the spring of 2018, the machine will complete its 2-kilometre journey under the city, exiting behind the Supreme Court of Canada.
The Combined Sewage Storage Tunnel (CSST)
The CSST will greatly reduce the frequency of combined sewage overflows entering the Ottawa River. During major rainfalls, the tunnels will hold up to 43,000m3 of surface runoff and wastewater – as much as approximately 18 Olympic-sized pools. Once the rainfall subsides, the water will be treated before being returned to the river.
By keeping sewage overflow from entering the Ottawa River, the CSST will protect the health of our aquatic ecosystem, lower the amount of contaminants released into the river and improve the water quality. The CSST is also good for our drainage system; it will reduce the risk of basement flooding in the city’s core, and provide increased capacity and reliability to our sewer system.
The CSST will consist of two inter-connected tunnels over six kilometres in total length, three metres in diameter, located 10 to 31 metres below surface level. The North-South Tunnel will run below Kent Street, from Chamberlain Avenue to just behind the Supreme Court of Canada, and the East-West Tunnel will run through the downtown core, from Stanley Park to LeBreton Flats, generally under Cumberland and Slater Streets.
The CSST project is a $232.3 million investment, with funding provided by the Government of Canada, the Government of Ontario, and the City of Ottawa. The Government of Canada and Province of Ontario are each providing $62.09 million and the City has committed $108 million.
The Tunnel Boring Machine (TBM)
The TBM, which can cut through solid rock at the pace of approximately 20 to 25 metres per day, will be used to construct the tunnels. When fully assembled, the TBM will be roughly 4 metres in diameter and 250 metres long – more than 4 times the length of an NHL rink.
The face of the machine has a rotating cutter wheel that grinds and chips away the rock in various sizes, ranging from tiny gravel to fist-size pieces, as the machine moves forward. This material is then transferred from the tunnel by conveyors and mucking cars on tracks back to the shaft entrance to be taken away. As the machine mines the tunnel, precast concrete liners will be placed in segments behind the machine and grout added to permanently seal the tunnel.
Quotes
“Infrastructure investments are vital to creating jobs, strengthening the middle class and building more inclusive and healthy communities where families can work, learn and play. Today’s milestone for the Combined Sewage Storage Tunnel project will help protect the environment, reduce residential flooding, and ensure that Ottawa residents and their families can enjoy recreational activities on a cleaner and healthier Ottawa River.”
The Honourable Catherine McKenna, Minister of Environment and Climate Change and Member of Parliament for Ottawa-Centre, on behalf of the Honourable Amarjeet Sohi, Minister of Infrastructure and Communities
“High-quality water and wastewater infrastructure is an essential part of building liveable communities. The Combined Sewage Storage Tunnel project is of critical importance to our community, as it will help protect and preserve, in the shadow of The Peace Tower, one of Canada's great watercourses, The Ottawa River.”
The Honourable Bob Chiarelli, Minister of Infrastructure and Member of Provincial Parliament for Ottawa West – Nepean
“This is a significant milestone for the Combined Sewage Storage Tunnel project, which brings us one step closer to fulfilling a major goal of the Ottawa River Action Plan. I am pleased that we are delivering on Council’s commitment to protect our precious water resources and ensure the health and vitality of the Ottawa River for future generations.”
Mayor Jim Watson, City of Ottawa
Resources:
Website: Combined Sewage Storage Tunnel (CSST)
查看原文...
Approximately one year ago, the City put shovels in the ground at Chamberlain Avenue and Kent Street to create an access shaft to tunnel north. Now the 23-metre deep shaft is complete, and the tunnel boring machine (TBM), which will be used to excavate the tunnel, is being assembled underground for launch. Tunneling will begin later this fall.
The TBM will be 250 metres long once fully assembled, and will work as deep as 31 metres below surface, with up to nine people inside it. At the other end of the future North-South Tunnel, work is underway on the exit portal near the Ottawa River, where in the spring of 2018, the machine will complete its 2-kilometre journey under the city, exiting behind the Supreme Court of Canada.
The Combined Sewage Storage Tunnel (CSST)
The CSST will greatly reduce the frequency of combined sewage overflows entering the Ottawa River. During major rainfalls, the tunnels will hold up to 43,000m3 of surface runoff and wastewater – as much as approximately 18 Olympic-sized pools. Once the rainfall subsides, the water will be treated before being returned to the river.
By keeping sewage overflow from entering the Ottawa River, the CSST will protect the health of our aquatic ecosystem, lower the amount of contaminants released into the river and improve the water quality. The CSST is also good for our drainage system; it will reduce the risk of basement flooding in the city’s core, and provide increased capacity and reliability to our sewer system.
The CSST will consist of two inter-connected tunnels over six kilometres in total length, three metres in diameter, located 10 to 31 metres below surface level. The North-South Tunnel will run below Kent Street, from Chamberlain Avenue to just behind the Supreme Court of Canada, and the East-West Tunnel will run through the downtown core, from Stanley Park to LeBreton Flats, generally under Cumberland and Slater Streets.
The CSST project is a $232.3 million investment, with funding provided by the Government of Canada, the Government of Ontario, and the City of Ottawa. The Government of Canada and Province of Ontario are each providing $62.09 million and the City has committed $108 million.
The Tunnel Boring Machine (TBM)
The TBM, which can cut through solid rock at the pace of approximately 20 to 25 metres per day, will be used to construct the tunnels. When fully assembled, the TBM will be roughly 4 metres in diameter and 250 metres long – more than 4 times the length of an NHL rink.
The face of the machine has a rotating cutter wheel that grinds and chips away the rock in various sizes, ranging from tiny gravel to fist-size pieces, as the machine moves forward. This material is then transferred from the tunnel by conveyors and mucking cars on tracks back to the shaft entrance to be taken away. As the machine mines the tunnel, precast concrete liners will be placed in segments behind the machine and grout added to permanently seal the tunnel.
Quotes
“Infrastructure investments are vital to creating jobs, strengthening the middle class and building more inclusive and healthy communities where families can work, learn and play. Today’s milestone for the Combined Sewage Storage Tunnel project will help protect the environment, reduce residential flooding, and ensure that Ottawa residents and their families can enjoy recreational activities on a cleaner and healthier Ottawa River.”
The Honourable Catherine McKenna, Minister of Environment and Climate Change and Member of Parliament for Ottawa-Centre, on behalf of the Honourable Amarjeet Sohi, Minister of Infrastructure and Communities
“High-quality water and wastewater infrastructure is an essential part of building liveable communities. The Combined Sewage Storage Tunnel project is of critical importance to our community, as it will help protect and preserve, in the shadow of The Peace Tower, one of Canada's great watercourses, The Ottawa River.”
The Honourable Bob Chiarelli, Minister of Infrastructure and Member of Provincial Parliament for Ottawa West – Nepean
“This is a significant milestone for the Combined Sewage Storage Tunnel project, which brings us one step closer to fulfilling a major goal of the Ottawa River Action Plan. I am pleased that we are delivering on Council’s commitment to protect our precious water resources and ensure the health and vitality of the Ottawa River for future generations.”
Mayor Jim Watson, City of Ottawa
Resources:
Website: Combined Sewage Storage Tunnel (CSST)
查看原文...
