Thursday, December 13, 2018

Update: What are those wheels doing?


More photos! 

I went over to the construction site and took a new photo today.  It's below.  If you click on the image, you can download the original (with all of the EXIF metadata).  



This wasn't ideal lighting conditions for photography, but I did what I could.  

I also took my binoculars so I could get a close-up look, and found that the wheels actually have multiple loops of cable wrapped around them.  The yellow boxes (one per wheel) seem to be motors that drive the wheels (but I'm guessing about that).  

In this closeup (from another pic), you can see that the wheels are both "tipped inward" towards each other at about a 45 degree angle.  You can also see the cables, though it's not completely clear how the cables run from below other than they wrap a bit onto the wheel in multiple loops.   



I'll try to get better photos later.. Perhaps tomorrow I'll remember my telephoto lens.  We'll crack this Challenge yet!  

Searching on! 


12 comments:

  1. I got it before you psted this better image just now

    After a long, but interesting trawl thru construction sites of stadiums--I could see what looked like a floppy roof on the ground between them-I got onto roof lifter sites then found mention of 'strand jack'. Never heard of this but a quick click on images of strand jack I found lots of image hits like this one https://www.enerpac.com/en-us/strand-jack-accessories/USStrandJackStrandRecoiler

    So, what you ask about are the recoil wheels. As the cable is pulled the excess can be wound around the wheels you see. Going the other way the wheels with strands of cable feed the jacking system. Used for very heavy lifts apparently.

    Great way to spend on hour on a rainy rainy day jon tU

    ReplyDelete
    Replies
    1. Great job, Jon!

      I will try to find the answer with the new photos shared by Dr. Russell and using search, to find maybe a faster way to solve it. Or at least, a different way.

      Delete
    2. I was reading on Internet and found a very interesting article. It made me remember many Challenges in many ways, subjects, topics, tools and more.

      That Ebenezer geezer... who was the real Scrooge? "...Research by political economist Peter Clark has shown that he had been a corn trader and vintner whose family had supplied Captain Cook’s ship Endeavour as it charted the Pacific..."

      Delete
  2. I got it before you psted this better image just now

    After a long, but interesting trawl thru construction sites of stadiums--I could see what looked like a floppy roof on the ground between them-I got onto roof lifter sites then found mention of 'strand jack'. Never heard of this but a quick click on images of strand jack I found lots of image hits like this one https://www.enerpac.com/en-us/strand-jack-accessories/USStrandJackStrandRecoiler

    So, what you ask about are the recoil wheels. As the cable is pulled the excess can be wound around the wheels you see. Going the other way the wheels with strands of cable feed the jacking system. Used for very heavy lifts apparently.

    Great way to spend on hour on a rainy rainy day jon tU

    ReplyDelete
  3. Replies
    1. "I went over to the construction site and took a new photo today. It's below. If you click on the image, you can download the original (with all of the EXIF metadata). "
      fwiw - the EXIF info seems limited - is this showing all of it? - GPS not turned on? - tried to use (would have preferred) Jeffrey's Image Metadata Viewer, but couldn't get past the reCAPTCHA… meh
      Chrome exif of the strand Jacks — are there no Jills?…
      Jill & Jack & the cranes…

      Delete
    2. 2nd try…
      …if the new Charleston East campus ends up looking this good, I guess BIG and Heatherwick Studio will have succeeded… very serene…
      Dan's crane contribution to the Edo skyline.
      updated, w/ Jack - hope Hiroshige doesn't mind too much… Utagawa Hiroshige, Minowa, Kanasugi, Mikawashima, No. 102 from One Hundred Famous Views of Edo
      from Brooklyn
       did have pretty good documentation of the build…
      SERP examples…

      Delete
    3. WRT the EXIF .. you're right. Sorry about that. Blogger seems to have a new behavior (which is to store a smaller version of the original) -- the side effect of which is to remove the EXIF. I'll post links to MY copies of the original image in the future.

      Delete
    4. Mange tak, Daniel, Bjarke Smith
      BIG LON
      audio for viewing assorted cranes… jacks, towers, gantry, whooping, et al & otherwise.
      parental warning - 676,750,562 views - DJS
      …is there a finish date for this part of the project? or a hold and review period on the roof approach? and then there is the housing thingy…
      where's Elon's boring machine when you need it?
      boring…

      Delete
  4. Excellent vid at YT

    Bay Bridge SAS Tower—Strand Jacks and Rollers

    https://youtu.be/n7G7p1MPWlM

    https://www.youtube.com/watch?v=wJeyD_67YMo

    ReplyDelete
  5. …missed that several times as I was looking, but not seeing…
    that one cable isn't hooked to anything?

    ReplyDelete