Confederation Line (Stage 1) | In Service 1.0

[acottawa]

What is jet grouting?

[Richard Eade]

It is one way of solidifying non-cohesive till soils, such as what occupies the last 50 metres to be tunneled. Basically, a hollow drill is lowered to the depth required and then grout (weak cement) is blasted out of the sides of the drill’s head as the drill is withdrawn. The very high pressure, high velocity, jets of grout breaks up the surrounding soil, mixing it with the grout. The drill is moved a bit further along to do the same again, until the soil all along the tunnel’s path, at the tunnels depth, has been turned to ‘soilcrete’ (once cured, of course). It is then safe to tunnel through the (now) solid ground.

Check out the video from Hayward Baker: https://www.youtube.com/watch?v=e2aEEUvmLIM. The equipment should look familiar if you have checked out the Rideau Street site lately.

[acottawa]

Originally Posted by Richard Eade

It is one way of solidifying non-cohesive till soils, such as what occupies the last 50 metres to be tunneled. Basically, a hollow drill is lowered to the depth required and then grout (weak cement) is blasted out of the sides of the drill’s head as the drill is withdrawn. The very high pressure, high velocity, jets of grout breaks up the surrounding soil, mixing it with the grout. The drill is moved a bit further along to do the same again, until the soil all along the tunnel’s path, at the tunnels depth, has been turned to ‘soilcrete’ (once cured, of course). It is then safe to tunnel through the (now) solid ground.

Check out the video from Hayward Baker: https://www.youtube.com/watch?v=e2aEEUvmLIM. The equipment should look familiar if you have checked out the Rideau Street site lately.

Interesting, thanks.

[Guideway]

Is that what that giant pole thingy is on rideau street (at the west entrance)?

[acottawa]

I had a look at Cyville while doing a value village drop off. It looks very close to done (stairs, roof, mezzanine, platform, tracks, one power line all finished). It will be a long 2 years for people living nearby.

[Kitchissippi]

Originally Posted by acottawa

It will be a long 2 years for people living nearby.

Full LRT service is one and a half years away....

[rocketphish]

Rideau Street closes to traffic after 'small sinkhole' develops
Hole emerges near site of much larger sinkhole that swallowed street in June

CBC News Posted: Oct 02, 2016 4:35 PM ET Last Updated: Oct 02, 2016 4:49 PM ET



A stretch of Rideau Street was closed to traffic Sunday after a "small sinkhole" opened up near where a much larger hole swallowed the street this summer.

As of 4 p.m., Rideau was closed to motor vehicles from Sussex Drive to Dalhousie Street after the sinkhole appeared during construction work, said acting Staff Sgt. John Gibbons with the Ottawa Police Service.

"While in the midst of construction, a small sinkhole appeared on Rideau Street," Gibbons said in a statement.

"As a precaution, Rideau Street is presently shut down."

The sidewalk remained opened to pedestrians and OC Transpo buses were being rerouted to the Mackenzie King Bridge on the other side of the Rideau Centre, Gibbons said.

Rideau-Vanier Coun. Mathieu Fleury said on Twitter Sunday afternoon that "jet grouting" work opened a hole two feet deep and one foot wide, causing the street closure.

He said buses would be back on Rideau Street Monday morning.

In June, a massive sinkhole swallowed a portion of Rideau Street not far from the city's ongoing light rail construction site, causing a gas leak and forcing the evacuation of all nearby businesses.

While it's not known yet what caused the current hole, the city is assessing the situation, Gibbons said.

Rideau Street has been closed to all vehicles but buses, taxis and delivery vehicles since August 2015 for construction.

It was set to close nightly to all vehicles for light rail construction work on Monday until early December.

http://www.cbc.ca/news/canada/ottawa/small-sinkhole-rideau-street-october-2016-1.3788275

[rocketphish]

City closes section of Rideau Street due to small sinkhole

Joe Lofaro, The Ottawa Citizen
Published on: October 2, 2016 | Last Updated: October 2, 2016 5:59 PM EDT

No vehicles were swallowed up this time, but Ottawa police took extra precautions by closing part of Rideau Street on Sunday when another sinkhole opened up.

Police said a “small sinkhole” appeared during construction. Rideau was closed Sunday afternoon between Sussex Drive and Dalhousie Street as city crews assessed the hole.

Bus routes that normally use Rideau Street were being detoured to the Mackenzie Road bridge.

Coun. Mathieu Fleury said on Twitter the hole was one foot wide and two feet deep, and was caused by “settlement of grout in the bore holes” during construction.

He also indicated in his tweets that regular bus operations would resume in the morning.

Commuters should keep in mind there were previously announced nightly road closures for the same stretch of Rideau Street beginning Monday through December. The two-block section will be closed from 8 p.m. to 6 a.m. due to ongoing LRT Confederation Line construction.

During that time, buses are diverted to Mackenzie King bridge and businesses remain open, according to the city.

The small sinkhole appeared less than three months after a massive sinkhole gobbled up a parked van on June 8 and shut down the same section of Rideau Street for nearly three weeks.

http://ottawacitizen.com/news/local-news/section-of-rideau-street-closed-again-due-to-sinkhole

[1overcosc]

It might be best to just close the road entirely for a month or two.

[lrt's friend]

How about closing Rideau until tunneling is completed and the tunnel secured? What about our safety?

With so many road closures and detours and transit delays, I avoid downtown at all costs. Last time I went downtown, I was so confused, I wasn't sure where to go.

[Guideway]

At this rate: the sinkhole cement fillings will replace the jet grouting!

[rocketphish]

City reopens section of Rideau Street after a small sinkhole opened up

Joe Lofaro, The Ottawa Citizen
Published on: October 3, 2016 | Last Updated: October 3, 2016 11:47 AM EDT



No vehicles were swallowed up this time, but Ottawa police took extra precautions by closing part of Rideau Street on Sunday when another sinkhole opened up.

Police said a “small sinkhole” appeared during construction. Rideau was closed Sunday afternoon between Sussex Drive and Dalhousie Street as city crews assessed the hole.

Buses that normally use Rideau Street were being detoured to the Mackenzie Road bridge, but have since been allowed back on Rideau as of Monday morning.

Coun. Mathieu Fleury said on Twitter the hole was one foot wide and two feet deep, and was caused by “settlement of grout in the bore holes” during construction.

Commuters should keep in mind there were previously announced nightly road closures for the same stretch of Rideau Street beginning Monday through December. The two-block section will be closed from 8 p.m. to 6 a.m. due to ongoing LRT Confederation Line construction.

During that time, buses are diverted to Mackenzie King bridge and businesses remain open, according to the city.

The small sinkhole appeared almost four months after a massive sinkhole gobbled up a parked van on June 8 and shut down the same section of Rideau Street for nearly three weeks.

http://ottawacitizen.com/news/local-news/section-of-rideau-street-closed-again-due-to-sinkhole

[Uhuniau]

At the current rate, there won't be a single street left unclosed in Mathieu Fleury's ward before the next council election.

[PHrenetic]

Good Day, all.
Interesting note in the latest TPAP Completion reports for the Western 2:
from the Stage2 website downloads, Appendix K, Section 2.2.2 on Cleary station revised alignment :
Quote:
Alternative Alignment, was found to be feasible although it resulted in some encroachment of the spirals for the 120m station platform. In the west
end, the spiral at the end of the 95m radius track is 2.87m within the station, resulting in a deviation from tangent of 35mm. In the east end, the spiral at the end of the 99m
radius track is 3.49m within the station, resulting in a deviation from tangent of 24mm.
Although this deviation of design standards is appropriate in this location to achieve a
specific objective, this does not mean that this specific design variation should be utilized elsewhere.
The alignment design would maintain a 40 km/hr. speed limit through the alignment in
this area and the platform nosings would be cut back slightly to accommodate the
inswing/outswing of the vehicle. This type of alignment variation to standards was deemed acceptable in the Stage 1 alignment at Rideau Station (east end of station into
the Waller St. curve) and therefore was considered a possible alignment solution
through 747 Richmond Road at both ends of the station. While the design speed
throughout the EA alignment is 80 km/hr, the introduction of 40 km/hr curves at each end of the station platform is not considered an operational constraint to achieving the
ultimate capacity objectives for the Confederation Line.
UnQuote.

So... they already have shaved the platform in Rideau station to accommodate a tight tunnel curve, and will do the same at both ends of Cleary. Interesting.

EnJoy.

cross-posted to Western Corridor Extension.

[1overcosc]

When Phase 1 was put to tender, the section around Rideau Station was dubbed the "Innovation Zone", as many of the design specifics were left unspecified with the bidder asked to determine precise alignments and layouts, due to the complexities of having to make such tight turns & big elevation changes in that area.

[AndyMEng]

Originally Posted by 1overcosc

When Phase 1 was put to tender, the section around Rideau Station was dubbed the "Innovation Zone", as many of the design specifics were left unspecified with the bidder asked to determine precise alignments and layouts, due to the complexities of having to make such tight turns & big elevation changes in that area.

"We don't know what to do, you guys figure it out!"

[roger1818]

Originally Posted by AndyMEng

"We don't know what to do, you guys figure it out!"

That is likely partially true. Its also better to give the engineers some flexibility to find an optimal solution. Needlessly over specifying the requirements limits their ability to find a better solution. I believe that's what happened with the original tunnel alignment. The politicians were overly specific about the route before any engineering studies were done to determine what the best route actually was.

[rocketphish]

Construction Update
Week of October 3

Construction of Hurdman Station, a critical transfer point on the O-Train Confederation Line, continues to progress as crews mobilize to begin installation of structural steel. Further east, construction of the permanent bus loop has gotten underway at Blair Station, a key component to allow residents to transfer from bus rapid transit to light rail when revenue service begins in 2018.

---

Crews install rebar for the station walls at Pimisi Station

West Stations

Tunney’s Pasture Station: Station foundation work continues as crews install rebar for station footings and mobilize to begin caisson installation.

Bayview Station: Work on the ancillary building is ongoing; crews drill and pour caissons. Crews begin duct bank installation. Ground improvement activities and sewer work also occur.

Pimisi Station: The station walls and platform continue to take shape; activities include waterproofing, rebar installation and concrete pours. Crews also backfill, install duct banks and continue mechanical and electrical work.

---

Reinforcements at the Lyon Station east vent shaft

Central Stations

West Portal: Preparation for future guideway work continues on the ramp.

Lyon Station cavern: Crews continue work on the station’s concourse level; activities include rebar installation, formwork and pouring concrete. Shotcrete final lining in the east transition and arch final lining pours are ongoing.

Lyon Station west entrance: The station entrance continues to take shape; crews install rebar, formwork and pour concrete for the station walls and stairs.

Lyon Station east entrance: Crews continue work on the station concourse level; activities include rebar installation and concrete pours for station walls. At the east vent shaft, crews continue rock removals and install reinforcements.

---

Waterproofing the arch in Parliament Station cavern

Parliament Station cavern: Work on station L-walls is ongoing; activities include rebar installation and concrete pours. Waterproofing of the station arch occurs.

Parliament Station west entrance: Crews work on the station stairs and structural steel installation is finalized at the station entrance. At the east vent shaft, crews continue hoe ramming and rock removals over the weekend.

Parliament Station east entrance: Crews continue installing structural steel and removing the foundation wall. At street level, rock removals and line drilling are ongoing in anticipation of future blasting activities.

Traffic restrictions on Queen and O’Connor streets remain in effect.

---

Rebar installation in Rideau Station cavern

Rideau Station cavern: Crews waterproof, install rebar and pour concrete for station L-walls.

Rideau Station west entrance: Crews install falsework and rebar for the station roof slab. Drilling and overnight jet grouting activities continue through December.

Rideau Station east entrance: The station walls continue to take shape as crews install rebar, formwork and pour concrete.

---

Crews install rebar and formwork at uOttawa Station

Traffic restrictions on Rideau Street remain in effect.

East Portal: Crews continue ramp excavation and install whaler beams as part of reinforcement work during the day and overnight in preparation for future guideway work.

uOttawa Station: The station continues to take shape; crews install rebar, formwork and pour concrete for the suspended slab. As part of the next phase of construction, crews begin excavating for station footings.

---

Formwork installation at Cyrville Station

East Stations

Lees Station: Work continues on the station raft slab; activities include rebar installation and concrete pours. Crews begin sewer installation.

Hurdman Station: At the station, crews continue pouring the concourse floor slab, finalize masonry for the block wall and mobilize to begin structural steel installation. Work continues at the bus operator’s building including electrical and roof installations.

Tremblay Station: The station construction continues to progress; crews pour concrete and install structural steel and the roof metal deck. Work on the station canopy occurs.

---

St-Laurent Station: Crews work on the hydro room and begin preparations to install the station escalators. Electrical work and trackwork are ongoing in the station.

Cyrville Station: Crews install rebar, formwork and complete concrete pours as the station concourse level and stairs take shape. Work on the parapets and the station roof is ongoing. Electrical work occurs at the auxiliary building.

Blair Station: Construction of the station continues to advance; crews work on the station roof, soffit and continue mechanical and electrical works as well as landscaping activities. Permanent bus loop construction begins.

---

Crews install reinforcements in the running tunnel

Tunnel Excavation and Support

Mining of the running tunnel is ongoing and crews install reinforcements.

---

Systems installation at Blair Station

Guideway

Tunney’s Pasture Station to West Portal: Guideway and trackwork activities continue; crews install fencing and the Overhead Catenary System foundations during the day and overnight. Flash 🞵🞵🞵🞵 welding and pulling rail also occur in sections.

Mann Avenue Bridge to Tremblay Station: Guideway construction continues in sections; crews install duct banks, fencing and ballast. Between Rideau River Transitway Bridge and Tremblay Station, crews continue trackwork activities, including ballast installation, pulling rail and welding.

Belfast Yard to Blair Station: Systems and cabling installation are ongoing

---

Other Activities

Bayview Bridge: Reconstruction of the Bayview Bridge is ongoing; crews continue excavation and work on parapets and the transition slab.

CPR Bridge near Bayview Station: As part of bridge reconstruction, crews work on the pier caps and abutments and begin girder installation.

Mann Avenue Bridge: Crews complete caisson installation, work on the bridge abutments and pier caps, and mobilize by the end of the week to begin installing girders overnight.

---

Upcoming Construction Activities

In the coming weeks, the following construction activities are scheduled to occur:

• Tunney’s Pasture Station work requiring right turn lane restriction.
• Delivery of Traction Power Sub Station (TPSS) on the guideway near Tunney’s Pasture Station.
• Blasting at Parliament Station east entrance.
• Structural steel installation at uOttawa Station.
• uOttawa Station concrete pours requiring intermittent closures of the pedestrian tunnel.
• Mann Avenue Bridge work and overnight lane closures.
• Vehicle testing and Overhead Catenary System will be energized in phases along the guideway between Belfast Yard and Blair Station.
• TPSS installations along the alignment.

http://www.ligneconfederationline.ca/construction/construction-update-93/

[DarthVader_1961]

Specific to Hurdman station.... Why did they choose an elevated approach?

[kmcamp]

Originally Posted by DarthVader_1961

Specific to Hurdman station.... Why did they choose an elevated approach?

I think it has to do with the fact it's a high volume transfer station. You need the buses and trains at a separate level. If it was at-grade, then all the westbound passengers would have to go up a set of stairs, cross a bridge, and then down again on the other side. With the elevated station, the passengers only have to go up/down one set of stairs, which makes for a faster transfer.