underground eglinton crosstown lrt stations take shape with unique mining technique

by:Gewinn     2019-09-09
Twenty metres below Eglinton Ave
Dozens of workers waving huge machines are building a building that looks like an underground cathedral.
In fact, it is the future site of Laird station and one of the 25 planned sites of Eglinton Crosstown light rail.
Laird will be one of the 15 underground stations in Crosstown for $5. 3-
Province billion
The funded light rail project will span 19 kilometres across Toronto Midtown, one of the three stations being built using a unique mining process called sequential mining method (SEM).
The station is still a few years away from completion, but the progress is clear.
\"It\'s always exciting.
When I came here it was just a parking lot and nothing else.
Every time you see it at each stage, it\'s changing and impressive, \"said Aleix Giralt, Laird project manager of Crosslinx, a consortium hired to build LRT.
More typically, underground stations are built using \"cutting\"and-
The method of \"covering\" includes digging a large area, building a station underground, and then covering it.
Using SEM, only one small surface area was excavated to form a shaft leading to the station level and then hollowed out the station site from below.
The reason why this method is chosen is because at 489, Laird will be a particularly long Station that will not only accommodate passenger platforms, but also rail crossing stations for trains to travel in reverse, and pocket tracks for storing vehicles. Cut-and-
It takes nearly 500 metres to cover Eglington Avenue.
This will make the buildings in billostown more destructive.
SEM is more common in Europe, but it has never been tried in Toronto before, according to crosswlinks.
Read more: the Eglinton Crosstown construction site was shut down by residents complaining that workers were smoking in a city eager for more transportation, and for Toronto\'s Little Jamaica, the news media announced plans to help Eglinton businesses, because the LRT building started before the Laird station started working, the boring machine created two smaller
To build the station, the staff entered the tunnel on both sides of Laird from two shafts south of Eglington.
Once into the tunnel, in order to create a space large enough to build the stations, the workers gradually expanded them out.
This is a complex process because workers have to keep stabilizing the tunnel as it expands to prevent it --in.
First of all, the crew used a large machine called \"giant\" for 18-
A one-meter-long pipe is inserted horizontally into the clay.
They are tightly spaced together to form a \"pipe roof\" that supports the ground \".
They then dug out the material under the pipe shed with an excavator, including the removal of the tunnel lining previously installed by the tunnel rig.
Finally, the newly expanded tunnel surface is sprayed with special concrete called sprayed concrete.
Sprayed Concrete sets so fast that it is safe to work in about 10 minutes.
The workers repeated these three steps in each section of the tunnel, digging about one. 5 metres a day.
In the end, the double tunnels will be extended until they are merged to create a separate open space.
But at the current stage, they have expanded upwards to become towering galleries with arched arches.
The arch is the best shape to support the weight of the ground, but the effect is to make the site look like some sort of underground church.
The SEM process is expected to be completed by July 2019 and Crosstown is scheduled to open by September 2021.
To meet these schedules, two staff members, consisting of 10 people, work around the clock seven days a week.
\"You\'re trying to keep things going,\" said Steven Dubo, field director of the project . \".
\"This will never stop.
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