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As engineers on Friday ventured into the LRT tunnel far below Rideau Street to assess the damage caused by the massive sinkhole that opened up earlier this week, crews above them continued working around the clock to repair the damage at street level.
After pouring several thousand cubic metres of concrete into the hole and waiting for it to set, workers focused on repairing the infrastructure that was damaged when the road collapsed on Wednesday morning, ultimately swallowing a minivan and one piece of construction equipment that are now both encased in concrete.
There were no injuries and no cause has been established, though many wonder if it could be connected to the LRT work happening below.
Rideau Transit Group, which is building the LRT, is coordinating the repair work with various city departments and the utility companies.
Pipes located deepest in the ground used to move sewage and stormwater were to be fixed first, followed by water and utilities, including power, natural gas and telephone, which are located closer to the surface, said city manager Steve Kanellakos in an interview.
If workers can safely be in the hole while the nearby roads — Colonel By and Sussex drives — are open to traffic, Kanellakos said the city would open the road (it hadn’t happened as of 4 p.m. Friday).
“That would be a great achievement if we can do that,” he said, adding: “If they can’t safely get in there or the equipment they need can’t be accommodated because of traffic, we’ll keep it closed until they finish the work.”
But the stretch of Rideau Street between Dalhousie and Sussex will remain closed for some time yet, Kanellakos said.
“They’re still thinking one to two weeks is a reasonable timeframe for them to finish that work, barring any other things they discover,” he said.
After all the underground infrastructure is fixed, more concrete will be poured and then the roadway will be resurfaced.
The street closure has been a pain to many transit users and pedestrians this week, but most drivers should already be accustomed to avoiding the area.
Rideau between Sussex and Dalhousie was closed to most vehicle traffic last August as part of LRT construction, while one lane in each direction was restricted to OC Transpo and STO buses, taxis, delivery vehicles and LRT construction vehicles.
The LRT tunnel is about two dozen metres underground, far below the sinkhole, which was estimated to be about five metres deep.
RTG’s engineers were hoping to determine Friday what shape the tunnel is in.
“They don’t think there’s any permanent damage there,” Kanellakos said. “It’s just a question of getting out some of the water, some of the debris that might have come in.”
The city manager said he had a productive meeting with RTG officials Thursday.
“They are focused on getting back to work,” he said, noting it’s still early to know when crews might return to their jobs at that location. RTG is working on a “tunnel reinstallment plan.”
Elsewhere underground, work continues in the three downtown stations, including Rideau, which is just east of the sinkhole site. Crews were down to the final 50 metres of tunnelling at the time of Wednesday’s road collapse.
RTG officials don’t fear the timeline for opening the Confederation line in 2018 will be delayed, Kanellakos said.
No one from RTG was available for an interview, but the company is supplying the city with regular updates, said spokeswoman Kathryn Keyes.
City officials did not hold a media briefing on Friday, as they had on Wednesday and Thursday.
A lunchtime memo from Kanellakos to the mayor and city councillors reiterated several key pieces of information heading into the weekend.
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After pouring several thousand cubic metres of concrete into the hole and waiting for it to set, workers focused on repairing the infrastructure that was damaged when the road collapsed on Wednesday morning, ultimately swallowing a minivan and one piece of construction equipment that are now both encased in concrete.
There were no injuries and no cause has been established, though many wonder if it could be connected to the LRT work happening below.
Rideau Transit Group, which is building the LRT, is coordinating the repair work with various city departments and the utility companies.
Pipes located deepest in the ground used to move sewage and stormwater were to be fixed first, followed by water and utilities, including power, natural gas and telephone, which are located closer to the surface, said city manager Steve Kanellakos in an interview.
If workers can safely be in the hole while the nearby roads — Colonel By and Sussex drives — are open to traffic, Kanellakos said the city would open the road (it hadn’t happened as of 4 p.m. Friday).
“That would be a great achievement if we can do that,” he said, adding: “If they can’t safely get in there or the equipment they need can’t be accommodated because of traffic, we’ll keep it closed until they finish the work.”
But the stretch of Rideau Street between Dalhousie and Sussex will remain closed for some time yet, Kanellakos said.
“They’re still thinking one to two weeks is a reasonable timeframe for them to finish that work, barring any other things they discover,” he said.
After all the underground infrastructure is fixed, more concrete will be poured and then the roadway will be resurfaced.
The street closure has been a pain to many transit users and pedestrians this week, but most drivers should already be accustomed to avoiding the area.
Rideau between Sussex and Dalhousie was closed to most vehicle traffic last August as part of LRT construction, while one lane in each direction was restricted to OC Transpo and STO buses, taxis, delivery vehicles and LRT construction vehicles.
The LRT tunnel is about two dozen metres underground, far below the sinkhole, which was estimated to be about five metres deep.
RTG’s engineers were hoping to determine Friday what shape the tunnel is in.
“They don’t think there’s any permanent damage there,” Kanellakos said. “It’s just a question of getting out some of the water, some of the debris that might have come in.”
The city manager said he had a productive meeting with RTG officials Thursday.
“They are focused on getting back to work,” he said, noting it’s still early to know when crews might return to their jobs at that location. RTG is working on a “tunnel reinstallment plan.”
Elsewhere underground, work continues in the three downtown stations, including Rideau, which is just east of the sinkhole site. Crews were down to the final 50 metres of tunnelling at the time of Wednesday’s road collapse.
RTG officials don’t fear the timeline for opening the Confederation line in 2018 will be delayed, Kanellakos said.
No one from RTG was available for an interview, but the company is supplying the city with regular updates, said spokeswoman Kathryn Keyes.
City officials did not hold a media briefing on Friday, as they had on Wednesday and Thursday.
A lunchtime memo from Kanellakos to the mayor and city councillors reiterated several key pieces of information heading into the weekend.
- Road closures and transit detours remain in place while crews repair the damage and restore services
- Sidewalks on the north side of Rideau between William and Dalhousie streets and on the south side of Rideau between Nicholas Avenue and Dalhousie have re-opened, facilitating the reopening of businesses in those areas
- Additional signs and digital boards have been put up to help the public navigate around the site
- Water service has been fully reinstated to most buildings in the area and Ottawa Public Health’s precautionary boil-water advisory only remains in place for some businesses (it was lifted for the Rideau Centre food court)
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