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How those excavators will be lift up or back on the exact ground level? What is the process of that. As they are 105 + ft down and digging the ground. . What they do to lift up the excavators to make them reach at ground level or any top to bottom they made temporary path or small road
I wonder how many cool artifacts, bones, fossils, etc are digger up and never found in construction like this. They just get relocated and used as clean fill somewhere.
And why would they have shut the job down exactly? Canadian safety standards tend to be more stringent than OSHA's as a rule. What did you see in this video that you deem to be unsafe?
Usually the shoring walls (the concrete-covered walls that you see in the video ) act as the outside form for the actual walls of the building. There isn't an space left when they;re poured. Sometimes they even spray shotcrete directly on the shoring wall and finish that with trowels, that makes u the inside walls of the parkade.
Pretty easy lift. The large Cat excavators weight between 80000lbs and 200000lbs so if they are the largest ones then about 100 short tons. They look like 352F's which are in the 120000lbs range so about 60 tons or so. A 200 ton wheeled crane like a Liebherr LTM1160 would make short work of lifting each of the excavators out of the hole.
Thanks for the correction on the machine model number. The last two digits of the model number indicate the weight in metric tonnes so the machines weigh about 100000lbs. Easy lift for a 200 ton crane. Thanks for posting these video’s very interesting to watch. jb
My dad make me a dig a hole this size with a short shovel for a waterproofing job. Told me it had to be done that way to save money and he still complain after the job finish he didn’t charge enough.
By chance, you didn’t happen to get any video of them removing the excavators once the digging was completed? Given the depth of the hole combined with the weight of each piece of equipment the removal would have been an interesting video as well.
I"ve casually seen a few deep excavations in Vancouver - like the Canada Line section of Skytrain. What is that blue-grey ground material and how deep does it go? It seems endless and not to bad to work with for stability and consistency. Looks like glacial (marine) till - but sooo deep
Shale Rock, compacted mud and clay. This construction site is only 350 metres from the shoreline so the hardpan on this dig began only a few metres from the surface. (Disclosure: I'm no expect or geologist.)
With a crane like this one ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-C79Ejh4RfLs.html and the last of the spoils with a clam shell bucket crane like this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-GD-TQzdHbOU.html
That top one is reaching WAY down, whew. I was wondering why a conveyor belt system isn't being used? Maybe too much structure to be built around it, and the constant need to reposition? Big job no matter how you approach it.
@rats arsed I can't wear them long with a hole I get bothered by said hole and ultimately go hulk on the hole and tear it until it can't be worn by hulk anymore.
I was thinking the same thing. Probably would be a huge chunk of change to make a custom setup then to have it not be used again or for at least a long time and having to keep it somewhere afterward until needed again or until scraped or sold. Sounds like a headache really to me lol. I could be way wrong tho idk.
The angle required would have been too steep at some point to function properly and that pit is way past that point.. The different materials it would need to transport out would be a factor and would also impact the operational angle in addition to placing a size restriction on the material that can be loaded on the conveyor therefore possibly requiring more equipment and manpower to break down.. You could do it in stages but they take up a lot of room and would be in the way but your comment certainly brings a few ideas to mind...like a hydraulic powered, varying angle, wall hugging, modular step conveyor system, or maybe a vertical screw tube system..you could prob adapt an existing scissor lift platform and add conveyors as a conceptual design....im just thinking out loud here Im no expert but your light bulb inducing comment caught my attention
@@richardcox8409 They have different kinds of converyers. That's a good point about the angle but you could have a converyer that has buckets and you would only need minimum angle. They probably just made best with what they already had.
I thought about the belts that have the small bars on them after i posted and never thought of buckets like a dredge...and yeah Im with you on the "just made the best"
I am amazed at all of the armchair quarterbacks proposing clamshells or conveyor belts to do this excavation. They so obviously know nothing about construction sites in a downtown core and the challenges that go along with them. But common sense should tell them that the companies contracted for this job just might have a little knowledge about what they are doing. These jobs are put up for tender and the lowest bid usually gets the job. Sure some contracts are awarded on a cost plus basis, but those are usually government contracts or large utilities like nuclear power plants and hydroelectric dams. Even then the costs have to be justified and are scrutinized every step along the way.
Cool video, I've just been watching a company excavating some foundations in Manhattan, got me wondering how they do it and I found your video. Thanks for taking the time to put it all together.
My guess would be they used the equipment they owned . As a business owner I’d rather use my equipment and have it take a little longer than spend a bunch of money on the perfect system for each job
As a German, do you have any suggestions, or just the knowledge that there "have to be more efficient and faster ways. brb., designing something." ? "brb"?
I’ve seen multiple comments about a conveyor system. The steepest angle a standard conveyor works at (around 30 degrees) would require a much larger hole or many conveyors to get to the bottom. Either way they would be in the way of the shot Crete shoring process, excavation and the constant changing depth would require constant modification to the system. A drag slat conveyor or bucket elevator system would possibly work but again the angle is probably too great as those max out at near 50 degrees, are not typically modular, usually aren’t longer than 100 ft and again would need to be constantly modified to accommodate excavation/ would be in the way of the shot Crete shoring process. This is the most efficient way to do this in this depth/footprint of excavation…… that why it’s basically done this way everywhere.
@@Zepfancouver Those pictures illustrate what I’m talking about. The angle becomes a problem as the depth increases. In a shallow hole it would work. But realistically…. 2 349 excavators would still be much faster/more cost effective on that site too.
Good job. We are going to have such a job, digging 10 meters (one third of yours). We will make a ramp while excavating and send dump trucks down to load the excavated soil. At the end, the excavator will dig the ramp from bottom to top to finish the job. In your case, with 105 ft, I don't think ramping would be possible. Have you considered this alternative?
Some places have sinkholes. This one looks like a shithole. Unless of course you give us a follow up and turn out to be a DTT. Then it would really be something right?
Blasting was used multiple times, at 5:09 you can see large fragments of shale rock from blasting and some blasting mats stacked up next to the pile of shale rock.
It took 10 months. I don't know how much it costed, I would like to know. I don't work for NorLand Limited. I missed the removal of the excavators, was at work that day, NorLand Limited posted a great video of removing the excavator on a different project norlandlimited.com/news/lifting-two-excavators-100ft-deep
quite the opposite. these are hybrid electric CAT excavators that are extremely fast and fuel efficient. they are also quite large and can move large quantities of material very quickly especially with a skilled operator.
They spent $2.3 million to do the 48” bore holes. Forget about the beach, should have lowered the ground to sea level 300 foot around the money pit. Once at sea level either sink a wall as in this video or a sheet pile like they did on the beach, would cut any flood tunnels. Dig down slowly like an archeological dig. Since the pad looks to be about 40 feet above sea level, they would need to only sink a pit about 140 foot to bed rock and reveal all attempts at searching as well as flood tunnels and hopefully a money pit? Only hitch is if there are caves or cracks with access to water lower down and fill up from below hard to seal and pump out. Had they done this 4 years ago they could have saved money, dug through the winter with a covered pit and we would have had some kind of resolution, show is getting kind of boring with constant rehashing of what we already know.
Slow going. How many CY/day were you getting? Obviously no room for a crane/bucket topside, and I assume you couldn't get a lane closure? How were you loading trucks hauling offsite?
I don't care for working underground one bit. That is always where the serious accidents happen.People get killed or messed up. Twenty stories up and I'm fine.
Nice work...hard work!!...respect to all d worker's...but...I've seen 187ft excavation in China...which was pretty SCARY just looking down!!...and you know what?...it was done MAINLY BY HAND...WITH HEAVY POWERFUL SOIL DRILLERS MANUALLY OPERATED BY D WORKERS...NO EXCAVATORS DOWN BELOW...JUST 1 SIMPLE TALL CRANE PLACED DOWN BELOW IN D CENTER!!...D WORKERS HAD TO B TRANSPORTED DOWN & UP BY D CRANE...AND D CRANE OPERATOR HAD TO CLIMB UP & DOWN THROUGH D FRAMES OF D CRANE AFTER PLACING D TOP OF IT IN A STRATEGIC PLACE WHERE HE COULD SAFELY STEP-OUT!!...Impressive i might say?!...it took them 5 dammnn years till completion...due to several STOPS & RE-STARTS regarding OUT OF BUDGET, SAFETY INSPECTIONS and WATER DRAINAGE!!
These deep excavations are mesmerizing when you are standing at the edge... it feels very surreal to see a giant box excavated out of the earth. The Georgia Hotel rebuild was 110ft deep - very impressive. To those saying conveyor belts would be better, it really just doesn't work in this environment, this is a hard heavy material, and a conveyor belt would have a hard time lifting it vertically. At an incline, it would literally need to be wrapped around the inside of the excavation in a spiral to get useful production volume, and just would not be practical. Triple handling the load between three excavators that are sitting in place is actually not that bad efficiency wise - when they need to move, that's where major efficiency impacts occur. Regardless, it's a slow methodical process and strict safety rules for shoring and stabilization need to occur throughout the process. Near the end, cranes with claw buckets are used to extract the last of the material, and often it's incorporated as ballast within the core pour if the material is suitable. As a last step, large cranes hoist these 120,000+ lb machines out of the whole like little toys. Next time you walk by a site like this, stop and appreciate, they are marvels!
Reminds me of the old kids book, "Mike Mulligan and his Steam Shovel", where he digs a cellar so big the equipment could never get out: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KZtXtbZn5f0.html
How exactly are they going to get those vehicles out? Just imagining the expense of digging the hole and building the foundations make me sick. It’s probably millions I assume, it make’s me wonder how can anyone just afford to do something like that it’s very fascinating and sad that I would never have the ability to have something like this done
Sadly I was working that day they lifted the Excavators. Here are the same vehicles on a different site ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-EE36cai9y18.html being lifted out.
Why didn't they use a conveyor? Well, because it's must been installed somehow in that pit, but excavators will work there anyway, so it's doesn't have sense to spend time and money installing a conveyor.
They call it shotcrete (spray-on concrete) - Drilled holes in wall for tie rods, installed meshing then spray on concrete, like this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-o-6wNyYChV0.html a site (Alberni by Kengo Kuma) not far from here.
Gotta wonder what they were thinking. It would have been much more efficient to use a medium size Manitowoc or similar crane with a moderately large clamshell, with front end loaders instead of hoes feeding the pile for it to dig. Wouldn't even need to be a very big crane to beat this production rate, and footprint on the street wouldn't be much larger than the hoe up on the surface. These mid-size cranes are readily available to rent, so you don't need to buy one. Agreed that conveyors might have trouble with the big rocks they turned up. This is a real misapplication of excavators. One or 2 would still be needed for the detail work that excavators are good at. Not rocket surgery!
Missed the heavy lift, got home from work and they were gone, very disappointed. Uploaded the video and watched it, then I also down voted it because of the missing egress of these excavators. I feel your pain.
This is the method for the excavated perimeter walls - Shotcrete (spray-on concrete) - Drilled holes in wall for tie rods, installed meshing then spray on concrete, like this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-o-6wNyYChV0.html a site (Alberni by Kengo Kuma) not far from here.
@@Zepfancouver Thanks... That means step down process is followed. First excavation of few feet depth then shotcrete is done ... Then again further excavation is done and Shen shotcrete is done. This is repeated till desired bottom of excavation. Otherwise for such vertical cut soil wil collapse.
When she said "Deeper", he took it far too literally, spilling over into the following days and well into his place of work as a construction/excavation foreskin on a job site.
Lol that's pretty good....here in Australia things are very similar at times...especially our local council workers....I remember once I drove past some local works and someone had spray painted a sign that said.....more padded shovels required...says it all.
Yeh well unions can be a bad thing also.....building sites being held to ransom by unions over the most stupid things...we have one atm here....a 300million dollar high rise tower stopped because the government acused them of getting underworld figures here to stand over workers that complain about unsafe working conditions. And at the other end of the spectrum we have unions that demand unrealistic wages for workers...e.g..$38 per hour for a site cleaner....picking up offcuts!!! And wonder developers go bust!!! So union for life my ass!!!
Superb work, and in the video we only see the result of the real critical work : to do the contention walls to avoid collapses. That is the structural key of the whole further works, if you imagine the soil load against all that long and tall wall you can get scared. Congrats to those who calculated and made that critical part and thank you for upload video.
@@frontrowal8656 Anchors (the machine for that is visible, mostly covered with tarps, 2:12 for example) and spray on concrete (visible in the vid around 1:12, right rear corner) and probably steel mesh (not shown afaik).
