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Manicmechnic
Joined: 12 Jan 2005
Posts: 202
Location: Enfield CT. USA
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| Posted: Sat Nov 04, 2006 6:00 am Post subject: Challenge yourself here: |
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A Backhoe weighing 8 tons is on top of a flatbed trailer and 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 crisscross pattern layered at 1 foot vertical spacing.
Solve: When the shovel arm hits the overpass, how fast do you have to be going to slice the bridge in half? (Assume no effect for headwind and no braking by the driver...)
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 - Who cares, the trucking company just bought themselves a bridge.
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Rev.Vassago
Joined: 04 Apr 2006
Posts: 6125
Location: The other side of the coin
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| Posted: Sat Nov 04, 2006 6:36 am Post subject: |
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| Equipment was loaded backwards on the trailer. Just sayin'. :wink: |
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Roadhog
Joined: 16 Sep 2005
Posts: 4418
Location: Upper Lower Michigan...he heeeeeeeeee
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| Posted: Sat Nov 04, 2006 8:42 am Post subject: |
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Given=
clearance of back-hoe in locked down position =15.56 ft.
clearance from roadway to underside of overpass = 16.93 ft.
flatbed deck height @ normal tire pressure = 3.54 ft.
% of tire squat under load excess of 20-ton = +/- 19%
est. of tire rise due to tire temperature = +.073 in. realitive humidity 60%
diameter of driver faceprint on windshield
computer velocity readout at POI
total fecalmatter mass cc contents of driver shorts
conversion factors ...Xa2
..............................17c
..............................3.5T Y=mx + b
..............................where m is the slope and b is the Y- intercept
2h + 2w ~ P= 2 II 7 ~ [u3]
(x +/- h)2 + (y + k) 2 = 1 ~ X2 + (y-k)2
_________ ________ ____ ______
A 2 mx +/- b2-ub3 + Xa2 = b 2 x 17c
Combination Vehicle was traveling at approximately 64 mph.
All inertia was absorbed within 2 seconds.
Tensile strength of back-hoe no contest to overpass materials.
Had a CAT motor been propelling this Vehicle, instead of a Cummin's
our finding indicate total penetration...and Driver could have punched through quite easily...without impacting the windshield.
Further finding indicate boom extendtion would have occured with loading equipment forward or backward.
Driver was cited for not wearing a seatbelt. |
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Rawlco
Joined: 25 Jan 2006
Posts: 1166
Location: Central Maine
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| Posted: Sat Nov 04, 2006 10:19 am Post subject: |
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roadhog wrote: Given=
clearance of back-hoe in locked down position =15.56 ft.
clearance from roadway to underside of overpass = 16.93 ft.
flatbed deck height @ normal tire pressure = 3.54 ft.
% of tire squat under load excess of 20-ton = +/- 19%
est. of tire rise due to tire temperature = +.073 in. realitive humidity 60%
diameter of driver faceprint on windshield
computer velocity readout at POI
total fecalmatter mass cc contents of driver shorts
conversion factors ...Xa2
..............................17c
..............................3.5T Y=mx + b
..............................where m is the slope and b is the Y- intercept
2h + 2w ~ P= 2 II 7 ~ [u3]
(x +/- h)2 + (y + k) 2 = 1 ~ X2 + (y-k)2
_________ ________ ____ ______
A 2 mx +/- b2-ub3 + Xa2 = b 2 x 17c
Combination Vehicle was traveling at approximately 64 mph.
All inertia was absorbed within 2 seconds.
Tensile strength of back-hoe no contest to overpass materials.
Had a CAT motor been propelling this Vehicle, instead of a Cummin's
our finding indicate total penetration...and Driver could have punched through quite easily...without impacting the windshield.
Further finding indicate boom extendtion would have occured with loading equipment forward or backward.
Driver was cited for not wearing a seatbelt.
Also further findings indicate that had the trackhoe been manufactured entirely by Caterpillar AND the truck engine been manufactured by Caterpillar the bridge would have been completely demolished. |
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Rev.Vassago
Joined: 04 Apr 2006
Posts: 6125
Location: The other side of the coin
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| Posted: Sat Nov 04, 2006 11:31 am Post subject: |
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Rawlco wrote: roadhog wrote: Given=
clearance of back-hoe in locked down position =15.56 ft.
clearance from roadway to underside of overpass = 16.93 ft.
flatbed deck height @ normal tire pressure = 3.54 ft.
% of tire squat under load excess of 20-ton = +/- 19%
est. of tire rise due to tire temperature = +.073 in. realitive humidity 60%
diameter of driver faceprint on windshield
computer velocity readout at POI
total fecalmatter mass cc contents of driver shorts
conversion factors ...Xa2
..............................17c
..............................3.5T Y=mx + b
..............................where m is the slope and b is the Y- intercept
2h + 2w ~ P= 2 II 7 ~ [u3]
(x +/- h)2 + (y + k) 2 = 1 ~ X2 + (y-k)2
_________ ________ ____ ______
A 2 mx +/- b2-ub3 + Xa2 = b 2 x 17c
Combination Vehicle was traveling at approximately 64 mph.
All inertia was absorbed within 2 seconds.
Tensile strength of back-hoe no contest to overpass materials.
Had a CAT motor been propelling this Vehicle, instead of a Cummin's
our finding indicate total penetration...and Driver could have punched through quite easily...without impacting the windshield.
Further finding indicate boom extendtion would have occured with loading equipment forward or backward.
Driver was cited for not wearing a seatbelt.
Also further findings indicate that had the trackhoe been manufactured entirely by Caterpillar AND the truck engine been manufactured by Caterpillar the bridge would have been completely demolished.
I object. :evil: :x |
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Roadhog
Joined: 16 Sep 2005
Posts: 4418
Location: Upper Lower Michigan...he heeeeeeeeee
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| Posted: Sat Nov 04, 2006 12:29 pm Post subject: |
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Sustained! :? :)
(must own a "Hurry up will ya........I'm Cummin..") :P |
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Rawlco
Joined: 25 Jan 2006
Posts: 1166
Location: Central Maine
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| Posted: Sat Nov 04, 2006 12:52 pm Post subject: |
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Withdrawn. :lol:
But I made you consider it. :lol: |
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Rev.Vassago
Joined: 04 Apr 2006
Posts: 6125
Location: The other side of the coin
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| Posted: Sat Nov 04, 2006 2:22 pm Post subject: |
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To quote Johnny Cochran:
Quote: If the engine is red, the bridge is DEAD. |
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shyykatt
Joined: 06 Aug 2006
Posts: 2097
Location: MN
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| Posted: Sat Nov 04, 2006 7:41 pm Post subject: |
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| :shock: :shock: |
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Angel
Joined: 15 Oct 2005
Posts: 288
Location: Georgia
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| Posted: Sat Nov 04, 2006 11:29 pm Post subject: |
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| :lol: :roll: |
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Random_Facts
Joined: 06 Mar 2006
Posts: 558
Location: Northern California
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| Posted: Wed Mar 14, 2007 7:09 pm Post subject: |
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| Wow wouldn't want to have been that driver...thats a oops did I do that? lol. :shock: |
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eastern ontario
Joined: 05 Mar 2007
Posts: 984
Location: Eastern Ontario, CANADA
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| Posted: Wed Mar 14, 2007 8:45 pm Post subject: |
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| cmon roadhog, been 30yrs since i left school! |
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Mack2
Joined: 02 Jan 2007
Posts: 527
Location: North Carolina
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| Posted: Thu Mar 15, 2007 6:30 am Post subject: |
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| Just some more info. That excavator is a long reach machine meaning that the boom and stick are much longer than on a normal excavator so you have to load them backwards in order to avoid being over length. |
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Mack2
Joined: 02 Jan 2007
Posts: 527
Location: North Carolina
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| Posted: Thu Mar 15, 2007 6:36 am Post subject: |
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| Rawlco I have to object to the part about it being a Cat excavator frankley Cat can bring out there new 330 excavator and it still won't out dig our (1997 or 1999 can't rember) Link Belt 4300 with 8,000hrs. |
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Mack2
Joined: 02 Jan 2007
Posts: 527
Location: North Carolina
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| Posted: Thu Mar 15, 2007 3:04 pm Post subject: |
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Just so you know this how they normally look.
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