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#124395 - 09/27/06 02:58 PM Engineering Problem ...  
Admin  Offline

Joined: Oct 2000
Posts: 3,443
forwarded by email today:
(original source unknown)
Problem: A backhoe weighing 8 tons is on top of a flatbed trailer heading east on Interstate 70 near Hays, Kansas ? The extended shovel arm is made of hardened refined steel and the approaching overpass is made of commercial-grade concrete, reinforced with 1 1/2 inch steel rebar spaced at ?6 inch intervals in a criss-cross pattern layered with 1 foot vertical spacing.

Solve: ? When the shovel arm hits the overpass, how fast does the trailer with the backhoe have to be going to slice the bridge in half?? (Assume no headwind and no braking by the driver who is oblivious of the situation . . . )

Extra Credit: Solve for the time and distance required for the entire rig to come to a complete stop after hitting the overpass at the speed calculated above .
Answer: Scroll down..........
[Linked Image]

[Linked Image]

[Linked Image]
Answer -? ? It doesn't really matter... ? The point is that the trucking company just bought themselves a bridge...

Tools for Electricians:

#124396 - 09/27/06 05:32 PM Re: Engineering Problem ...  
Rewired  Offline
Joined: Jan 2006
Posts: 558
Hamilton, Ontario, Canada
THAT would have been something I would have LOVED to have seen! ( from a safe distance of course).
I would not believe it if I didn't see it!


#124397 - 09/27/06 05:47 PM Re: Engineering Problem ...  
Dnkldorf  Offline
Joined: Dec 2004
Posts: 1,064
nowhere usa
Ah, a little duct tape and it'll be fine....

That is a funny post..

#124398 - 09/27/06 05:57 PM Re: Engineering Problem ...  
Theelectrikid  Offline
Joined: Apr 2004
Posts: 810
Levittown, PA
ROTFLMAO!! Must be an idiot to do that!

Ian A.

Is there anyone on board who knows how to fly a plane?

#124399 - 09/27/06 06:30 PM Re: Engineering Problem ...  
walrus  Offline
Joined: Jul 2002
Posts: 680
Bangor Me. USA
Can you say photoshop

#124400 - 09/27/06 06:33 PM Re: Engineering Problem ...  
classicsat  Offline
Joined: Nov 2002
Posts: 456
"I was delivering this overpass and ran out of gas"

#124401 - 09/27/06 07:17 PM Re: Engineering Problem ...  
Gus99  Offline
Joined: Aug 2005
Posts: 24
Los Angeles, CA
They repaired the railing on both sides pretty quick didn't they!


#124402 - 09/27/06 07:21 PM Re: Engineering Problem ...  
NJwirenut  Offline
Joined: Sep 2001
Posts: 806
Bergen County, NJ
Not a fake:

Here's a news report:

[This message has been edited by NJwirenut (edited 09-27-2006).]

#124403 - 09/27/06 07:36 PM Re: Engineering Problem ...  
steve ancient apprentice  Offline
Joined: Mar 2005
Posts: 169
west springfield,mass
Even with my bi-focals I could see a sign as to how high the bridge is. Trueley Amazing.

#124404 - 09/27/06 07:54 PM Re: Engineering Problem ...  
iwire  Offline
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
NJ thanks for providing the links. [Linked Image]

I also thought I would point out that this is a type of hollow concrete box bridge.

It is not 3' or 4' of solid concrete, it is a couple of 10" to 14" decks.

Still amazing but much more believable that slicing a solid concrete bridge.

Zoom in on the first picture where you can see the bucket has punched a hole through the bottom deck in to the void.

Bob Badger
Construction & Maintenance Electrician

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