Subject: Engineering Problem.

MichTish

Seasoned Expediter
A backhoe weighing 8 tons is on top of a flatbed trailer and heading
east on Interstate 70 near Hays, Kansas USA at 65mph. 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 at 1 foot vertical
spacing.

Problem: 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.

See below for the correct answers .......


image0011.jpg



image0022.jpg



image0033.jpg











The correct answer - Who cares, the trucking company just bought
themselves a bridge.
 

RichM

Veteran Expediter
Charter Member
The trucking companies insurance company just bought a bridge. Now the trucking company will have no insurance.

I bet the driver bought him/herself unemployment real quick. Lucky that no one was in the middle of the bridge when that happened.
 

Jefferson3000

Expert Expediter
I saw the after effects of a boat hitting the overpass while traveling I-95 North near Vero Beach, FL. Not near as bad. In this case the driver only mis-calculated the height by a couple of inches.

Was the arm of that shovel resting lower originally and popped up? Sorry, I just have problems understanding how a pro driver would be so careless in choosing a road that would not allow his shipment to pass safely. :p
 

x06col

Veteran Expediter
Charter Member
Retired Expediter
US Army
We Carriers have large problems trying to understand the thinking processes of many drivers. Seems if they are not doing stupid stuff, they are doing really stupid stuff.
 

sixwheeler

Expert Expediter
>We Carriers have large problems trying to understand the
>thinking processes of many drivers. Seems if they are not
>doing stupid stuff, they are doing really stupid stuff.



We Drivers have large problems trying to understand the thinking processes of many carriers. Seems if they are not doing stupid stuff, they are doing really stupid stuff.

S... happens its an imperfect world.
 

jackdixon_2000

Veteran Expediter
Charter Member
Those are fascinating photos. I would like to know the whole story. I can't believe the driver would have knowingly hauled this equipment with the bucket arm not fully lowered. Maybe someone here with heavy haul or equpment experience can tell us if the hydraulics can rise on their own if not locked down?

Interesting how the arm facing to the rear, after making contact 2 to 3 feet above legal limit would continue knifing upwards?

Next physics question. Going from 65 mph to 0 in 35 ft what would be the sustained G force? I would say in this particular case there may have been a locking jaw failure and the tractor would have continued on, still a good example for seat belt use
 

jackdixon_2000

Veteran Expediter
Charter Member
Oh darn, don't ya just hate when you post and then realize you screwed up. I went back and realized I was thinking of the arm facing a different direction on entry. I see the obvious knifing effect now, duhhh, its still early here, need a second cup
 

MichTish

Seasoned Expediter
http://www.snopes.com/photos/accident/graphics/hoecrash4_small.jpg

The photographs displayed above capture the aftermath of an accident that occurred on the evening of 13 February 2006 on Interstate 70 near Hays, Kansas. The driver of a semi-tractor trailer that was hauling a track hoe excavator on a flatbed misestimated the clearance at an overpass, and the boom of the hoe collided with the overpass and knocked a 45-foot gap through the deck of the bridge. The accident forced an 11-day closure of the eastbound lanes of Interstate 70. (The bridge itself remained closed even after the highway reopened.)

The driver of the rig was uninjured, although he was later cited for not having clearance to drive on the interstate. The Kansas Department of Transportation said the construction company for which the driver worked would be liable for the cost of repairs to the overpass, which were estimated at $134,000 as of late March 2006.

An Associated Press photo captured the scene the night of the accident:



Interstate 70 bridge repairs near Hays could be done by August
Associated Press
HAYS, Kan. - The Kansas Department of Transportation said repairs to a 45-foot gap in a bridge over Interstate 70 should be done by August and could cost up to half a million dollars.

Kevin Zimmer, an area engineer for the Transportation Department, said contractors should have the deck of the bridge poured by July 4. Then workers will begin on the curb and rails.

The bridge near Hays was damaged Feb. 15, when it was struck by a flatbed trailer owned by Lee Construction. The truck was carrying a track hoe excavator, which struck the overpass and knocked a hole in the bridge, forcing an 11-day closure of the eastbound lanes of the interstate.

The driver, Michael M. Conley, was cited for deviating from his assigned route.

Zimmer has said the Transportation Department had to dip into its emergency funds to pay for traffic control after the accident and remove the damaged part of the overpass. He said the state plans to forward a bill for the repair work to Lee Construction's insurance company.

"We're focusing on rebuilding the bridge," Zimmer said. "At the end, we'll recap all of our expenses to the date. That's when it will be turned over to insurance."





Nuts and Bolts
Kansas construction firm has bad day
By Olivia Grider



If your truck drivers need a reminder to measure the equipment loads they’re hauling, an incident that happened near Hays, Kansas, in February is one of the best you’re likely to find.

An excavator being transported on a flatbed trailer smashed into an Interstate 70 overpass, its boom raising as it ripped more than halfway through the bridge. “We’ve never seen anything like this,†says Kevin Zimmer, area engineer for the Kansas Department of Transportation. “The boom just punched a hole through the deck.†Zimmer says minor overpass hits occur from time to time, but they usually take a 1- to 2-foot chunk of concrete out of the bridge and then slide under it.





The Transportation Department plans to bill Garden City, Kansas, firm Lee Construction, the owner of the tractor trailer, for the mishap. Cleanup costs totaled $134,000 and Zimmer says a 45-foot bridge section replacement could cost hundreds of thousands. Eastbound lanes of I-70 through Hays were closed for 11 days, sending drivers on a 9-mile detour. Zimmer says work on the bridge is scheduled to start this month and it will probably reopen to traffic in July.

The truck driver, Michael Conley, didn’t have the necessary permits to be on the interstate and was supposed to travel on two-lane roads. Unsure of the route he should take when he reached Hays, Conley looked at a map and saw he could use the interstate to get to his destination, Zimmer says. The excavator struck the first overpass he came to, about a mile into his journey on I-70. No one was injured in the collision, although debris damaged a sport utility vehicle that was driving alongside the semi. The trailer carrying the excavator separated from the truck.





Zimmer has this advice for anyone hauling large construction equipment: “Before you get headed down the road, check your actual height and make sure you know your route really well.â
 

LDB

Veteran Expediter
Retired Expediter
I see the $134k for immediate cleanup and the half million estimated charge to repair the bridge but nowhere is the replacement price of the backhoe mentioned in the insurance company's eventual bill. That can't be cheap either.

Leo Bricker, 73's K5LDB, OOIDA 677319
Owner, Panther trucks 5507, 5508, 5509
Highway Watch Participant, Truckerbuddy
EO Forum Moderator
----------
Support the entire Constitution, not just the parts you like.
 

arkjarhead

Veteran Expediter
My dad hauls stuff like that all the time. When you get your permits for the oversize loads your permit tells you what route you can safely drive. The only thing I can figure is the intial impact raised the boom. High loads are supposed to have pole cars in front. So when the pole smacks the truck stops.
 

Moot

Veteran Expediter
Owner/Operator
Wow! What a mess. An RGN heavy haul trailer ain't cheap either. The tractor must have sustained some damage also.
 
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