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Date: Sun, 21 Sep 2008 18:26:30 -0400
To: TSCM-L2006_at_googlegroups.com
From: "James M. Atkinson" <jm..._at_tscm.com>
Subject: Re: [TSCM-L] {2906} Engineering Quiz
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Looks like the boom was originally in the forward position, but that
the joint/knuckle was about two feet higher they the over pass, and
when the joint hit the overpass it forced the boom to extend. This
means the truck could have been moving pretty fast when it hit the
bridge and that much of damage was caused when the boom extended
after impact. I noticed that the excavator did not appear to be
chained down, and the trainer looks like the wrong kind to transport
this piece of equipment. The damage to the boom make me suspect that
the unit had not been properly retracted fully and that it was a
couple of feet too tall. The separation of the ram for the cylinder
on the rear of the boom make me suspect that the boom was still
partially extended, which would have raised the height by several feet.
I would estimate that at the point of impact the crane was moving
around 65 mph (+/- 5 mph), distance the tractor traveled/skid would
pinpoint speed at time of impact.
Not properly loaded, wrong kind of trailer, chains?, no height check
prior to departure, no route planning, speed too fast, etc.
-jma
At 01:46 AM 9/21/2008, Its from Onion wrote:
>
>
>
>
>
> An excavator 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 steel and approaching a two lane overpass made of 5,000
>psi concrete, reinforced with #6 steel bars spaced at 6 inches on center
>each way, each face.
>
>Solve: When the shovel arm hits the overpass, how fast does he 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 pix for answers)
>
>>
>
>
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Received on Sat Mar 02 2024 - 00:57:20 CST