Results 76 to 100 of 861
Thread: Gondola cable snaps
-
08-11-2019, 03:00 PM #76
-
08-11-2019, 03:01 PM #77
You could be on to something
“I have a responsibility to not be intimidated and bullied by low life losers who abuse what little power is granted to them as ski patrollers.”
-
08-11-2019, 03:19 PM #78
Correction: the tower after the first rise is not #8. The tower #8 with the first cabin fall was much further up the line, just after #9 (almost immediately) and beginning the long flat section. It looks like the tower numbers skip sometimes.
You would have to remind me! LOL.Last edited by puregravity; 08-11-2019 at 03:42 PM.
-
08-11-2019, 03:39 PM #79
Thanks Pure Gravity for bringing the knowledge. No evidence yet it was sabotage
Couple folks have mentioned thermite. Think that is possible and perhaps affords a little distance clinging on to the tower. If it was sabotage
-
08-11-2019, 03:52 PM #80
There’s a mechanical pressure relief as well as the active tensioning system that acts as a backup safety, and will allow it to let off pressure when the rope contracts when the control power is off. About the chinesium, I’ll damn near guarantee the rope is from the Swiss rope manufacturer Fatzer ( the lift manufacturers preferred supplier).
On the subject of how to cut a rope while it’s under tension. Since it’s a detachable gondola, it has a plastic core in the rope (nice and bendy, and supports the strands well) heat will do the trick. Melt the core, the strands lose support, the steel is probably close to red hot, and under tension, and that’ll do. Could take long enough for you to get away while it’s happening. In that old destructive test video they lit the shack on fire and guess what happened.
Sent from my iPhone using TGR Forums
-
08-11-2019, 04:49 PM #81
thats some ballsy shit if it was cut. where are the pics of the end of the snap. prob real easy for experts in the field to see it right off
-
08-11-2019, 05:51 PM #82Registered User
- Join Date
- May 2016
- Posts
- 3,612
-
08-11-2019, 06:40 PM #83
If it was cut with a torch, grinder, explosive charge, etc, it is going to be fucking obvious to just about anyone, even a RCMP inspector. And they aren't going to plaster all the evidence on the web.
That would explain why RCMP said "sabatoge" vs this being a weather induced failure under fully expected weather conditions.Originally Posted by blurred
-
08-11-2019, 06:49 PM #84
-
08-11-2019, 07:19 PM #85Registered User
- Join Date
- Jan 2013
- Location
- Northern BC
- Posts
- 2,596
Sorry for prying but, i’d like to hear more about your ´enormous agenda ´ .
Sent from my iPhone using TGR Forums
-
08-11-2019, 07:24 PM #86
Does egenda mean online?
-
08-11-2019, 07:31 PM #87Registered User
- Join Date
- Nov 2006
- Location
- idaho panhandle!
- Posts
- 9,987
-
08-11-2019, 07:39 PM #88
jeez, settle down eh.
-
08-11-2019, 07:45 PM #89
sorry for the wordplay.
allow myself to repeat myself
if someone cut that shit, that's ballsy. i'm also fascinated by engineering and physics.
sarcasm. eh.
-
08-11-2019, 08:16 PM #90Registered User
- Join Date
- Jan 2013
- Location
- Northern BC
- Posts
- 2,596
Gondola cable snaps
No no, not code for that. Îm just trying to move the conversation along. You never know, perhaps the suspects are amongst us on these very pages.
Sent from my iPhone using TGR ForumsLast edited by Angle Parking; 08-11-2019 at 08:43 PM.
-
08-11-2019, 08:39 PM #91Registered User
- Join Date
- Mar 2008
- Location
- northern BC
- Posts
- 31,060
get a room you 2
Lee Lau - xxx-er is the laziest Asian canuck I know
-
08-11-2019, 09:21 PM #92
i think we've covered it at this point.
glad no one was hurt, for sure
gnarly.
-
08-11-2019, 11:36 PM #93Registered User
- Join Date
- Jan 2013
- Location
- Northern BC
- Posts
- 2,596
Gondola cable snaps
We have covered it until we learn more. Much like the saga of the POS teenagers who recently met their demise, the story remains to be told.
Sent from my iPhone using TGR Forums
-
08-12-2019, 02:57 AM #94
I'd think the same thing. Now imagine, the car is parked on a tower, so that it comes to a stop overnight in this position so that the car grip is on the tower:
Now imagine that the car is swinging in a less violent state than before, but just enough that a collision is made with Haul Rope Catcher device and Detacheable Grip Torsion Tube. As in the test, then it "started to pull the haul rope out of the sheave liner groove".
So then a deropement happens on one wheel, with the car on the rope at that wheel, the force actually causes the car to come off the tower entirely because that is probably enough force to bring it out of alignment on one whole sheave assembly.
Now, the rope swings down. Say the tower is one after a long steep section (the whole S2S is steep for the first 7 towers). Now the rope drops down, the weight of both sides drops, and it bounces back up ...
Then what happens? The 'bounce' probably causes the rope to bounce off the wheels of the towers in front and behind it too.
Starts a catastrophic chain reaction that brings more derailments and vibrations ... causing an eventual rope failure too.
In the Whistler Gondola Accident, a quote says 'the car was moving a lot and the cables bouncing “like crazy"' and 'swinging wildly'
http://www.vancouversun.com/news/Twe...212/story.html
If someone had a string tram model and tried that, taking the rope off one tower and dropping it down, then I'd be surprised if the rope motion didn't take down the rope from all the towers on one side of the rope line. It might look like something impossible ... until a small event that produces a stronger motion brings more of the system into play.
edit: Just the right amount of tension in the system might make it all impossible. Maybe someone can explain how that all works.
JUST A THEORY.Last edited by puregravity; 08-12-2019 at 03:46 AM.
-
08-12-2019, 02:58 AM #95
Someone forwarded me a copy of the report from 2014 that I remember reading years ago.
BRITISH COLUMBIA SAFETY AUTHORITY INVESTIGATION REPORT
SEA TO SKY GONDOLA INCIDENT
February 4, 2014
Report No.: RPT-5095-00
https://imgur.com/a/qeK7jfH
For some reason, I can't actually find it anymore on the BCSA website. The original link to it there doesn't bring it up and and a search for the report number doesn't bring anything up either. In any case, I uploaded it as images for each page as a way of sharing it here.
There are some pictures and analysis of the deropement that occurred showing the tolerances in the system to movement caused by wind or other factors.
My only comment today for watercooler discussion, is this data from pages 4, 6, 15 and 16:
Page 4
----------
... The speed selector switch was in slow mode and the speed set point was 1.5 m/s (meters per second).
Page 6
----------
11. As the cabin loaded with the person performing the line check approached tower 13, the installation shutdown due to a rope position detector fault and a deropement detection switch fault detected at tower 7 at 8:30 AM. The rope position detector switch senses immediately when the rope starts to move out of its normal position and shuts the installation down. The deropement detection switch is a switch that detects when the rope comes off of the sheaves (or wheels) on a tower. The wind speed observed at tower 8 when the two faults occurred was 50 km/h. The gondola was running at a speed of approximately 2.5 M/S according to the information provided by the system data logger
It wasn't the actions of an employee that stopped the system. It was, in fact, the deropement detection that stopped the system. The fallen car was found later by the lift manufacturer employee walking the line.
Page 15
-----------
Testing at this location was limited to swinging the cabin towards the tower to a value of 16.4 degrees. At this inclination the detachable rope grip began to pull the rope out of the sheave groove and the torsion tube was 15 mm away from contacting the rope catcher. ...
Page 16
-----------
Status: SSGLP was required to lower wind speed thresholds for operations until such time as they could demonstrate an increased level of monitoring for this passenger ropeway alignment. SSGLP implemented the following improvements prior to receiving an operating permit for full public operation: An additional wind meter ... wind warning and wind alarm values that slow the system have been reduced ... A camera has been installed at tower 8 that monitors tower 7 for cabin movement ... Operation will not be permitted during wind speeds greater than 40 km/h or during forecasted arctic outflow winds.
ALL FOOD FOR THOUGHT
-
08-12-2019, 03:53 AM #96
^ i feel like you are onto something. wow!
wow!
-
08-12-2019, 03:54 AM #97
copy/paste.
-
08-12-2019, 04:27 AM #98
it's fine, give him time...
-
08-12-2019, 05:07 AM #99
I'm done.
I admit defeat.
Throwing in the white towel on my Dunning Kruger theories.
Perhaps I need to masturbate more
Even in the Whistler Gondola incident, with a complete tower collapse,
the haulline never broke.
Haul lines never break. Even in the craziest tower failures, the haul lines even end upholding up the broken towers.
Thermite?? Is that the going consensus?
It is really sad actually.
Sad for all the people that are without work.
Sad for the locals that were serving the tourist market.
Sad for the people that invest so much time and effort into making the system reliable every day.
Sad that someone might do such a thing.
-
08-12-2019, 08:57 AM #100
^ Yeah, that's my gut feeling. I can envision a lot of failures, but the haul cable snapping short of some kind of defect is difficult to imagine especially when the lift isn't running.
Bookmarks