always check your load height....

[Big Dog]

Engineering Quiz:

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.

How fast must the driver of the 18 wheeler be going to slice the bridge in half?

[NHMaster3015]

Engineering Quiz:

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.

How fast must the driver of the 18 wheeler be going to slice the bridge in half?

mass x enertia = disaster

[wrench spinner]

ill bet if he was going a few mph faster he could have made it through!

[PLUMBER RICK]

that backhoe/ excavator weighs a whole lot more than 8 tons.

my work truck is 7 tons and it would have been a book of matches if it hit the bridge. even i know what drive thru's i can fit under. (not many):banghead:

rick.

[MrsSeatDown]

my work truck is 7 tons and it would have been a book of matches if it hit the bridge. even i know what drive thru's i can fit under. (not many):banghead:

rick.

I thought you don't eat crap during the day. . . and you wonder why your cholesterol is high:slap:

[PLUMBER RICK]

I thought you don't eat crap during the day. . . and you wonder why your cholesterol is high:slap:

i clean drains, i eat crap all day long.:eek: it actually lowers my cholesterol as noting stays in me:barf:

remember, if the truck doesn't fit, i don't go.

it's all the family dinners this week that is pushing my cholesterol up:finger:


now back to the 8 ton load.

i'm guessing the counterweight alone is 8 tons and the excavator is closer to 35-40 tons.

rick.

[PLUMBER RICK]

my guess was pretty close 32 tons


Model
R290LC-7
Engine
Cummins QSB5.9-C
Operating Weight
29,300 kg (64,600 lb)
Bucket Capacities, SAE
1.27m? (1.66yd?)
Engine Rated Power
200(147Kw) / 1900 rpm
Max.Digging Depth
7,500mm (24'7")
Max.Digging Height
10,160mm (33'4")
Overall Length
10,560mm (34'8")
Overall Width
3,400mm (11'2")
Overall Height
3,290mm (10'10")
Travel Speed
3.1Km/5.2hr(1.9/3.2mph)
Bucket Digging Force
17,200Kgxf / 37,920lbxf


rick.

[plumberscrack]

Backhoe 1

Concrete Overpass 0


Usually the bridge wins that match but not this time ;)

He must have been going like 70 or 80 miles an hour right?

[Pipestone Kid]

Engineering Quiz:

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.

How fast must the driver of the 18 wheeler be going to slice the bridge in half?

Not enough info--was the backhoe running and in gear as well as riding on the flatbed? :grin-angelic::grin-angelic:

[Tom W]

I am willing to bet that exactly 365 1/4 days after that incident the driver will have been fired for exactly one year.

[BHD]

I think if you saw the close up pictures of the tack hoe, you would see the score as

track hoe 0

over pass 0

I do not think either one won on this ride, the trailer is on the ground the cylinders on the arms of the track hoe are ripped apart and in general on big pile of scrap iron,

[threecreeks3]

I saw basically the same thing happen years ago with a redwood log.The log left the trailer but it took out about a 6' wide 3' tall piece of overpass.It took them a long time to fix because of all the extended fractures in the concrete.
Sam

[Alphacowboy]

Not to mention, load your equipment correctly. The "hoe" was loaded backwards. When loading equipment with extendable arms, you are suppose to load them with the arms facing rearward. If this trackhoe would have been loaded that way, the damage to this bridge and machinery would have been MUCH less, or dare I say no major damage at all. But, because it was loaded with the arm forward, when the machine hit the overpass it drew the arm up and into the bridge multiplying the damage exponentialy.