Big Load ... Thx Clay V!

Subject: FW: 338 Wheeler

 

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 I AM A CRANE OPERATOR AND WAS OPERATING A 225 TON  4100 MANITOWOC UP AT HAVERHILL AND WE HAD A LOAD JUST LIKE THIS THAT CAME UP THE OHIO RIVER ON A BARGE AND WAS UNLOADED UP ABOVE IRONTON AT COLEGROVE OHIO AND IT TOOK THEM 5 DAYS TO UNLOAD A 125 TON VESSEL AND GET LOCATED ON A TRAILER SET UP JUST LIKE THE ONE IN THE PICTURE AND TO MOVE ALL THE AXLES IN PLACE TO DISTRIBUTE EQUAL WEIGHT ON EACH AXLE, THEN THE STATE INSPECTOR WOULD GET UNDER EVERY BRIDGE THAT THIS LOAD WENT OVER TO MAKE SUE IT DID NOT DO ANY DAMAGE TO THEM IT CAME DOWN ST RT. 52 TO HAVERHILL AND WE HAD TWO CRANES TO UNLOAD IT WITH AND TO STAND IT IN THE UPRIGHT POSITION AND THEN I SET IT ON IT BASE. THE VESSEL WAS 120 FEET IN HIGHT,. I WAS SO HAPPY TO HAVE THE CHANC TO SEE THIS PICTURE SO THANKS SARAH, I CAN SAY BEEN THERE AND DONE THAT.                         CLAY "SONNY" VICE

Thought you might get a kick out of this.                                                                        For the past few weeks, a "super heavy" load has been making its way from Hardeeville, South Carolina to Biggar, Saskatchewan  It is a large electric generator destined for a clean coal power plant. The generator weighs in at 1.98 million pounds and isn't something you just jump on an interstate freeway with and truck  it on down the road. In order to support such a load without destroying every inch of road you travel, the weight has to be widely distributed. You also have to travel back roads so that day to day commerce isn't completely disrupted along your route. After all..... your top speed on level ground is less than 20 mph and this drops to as little as 1.5 mph on grades and slopes. Rush hour traffic on an interstate would soon be solidly backed up to the state lines in both directions. I finally had time to catch up with the load on Friday as it moved along a stretch of country road near the NC state line, but was unable to get near enough to shoot photos.  Luckily, one of the crew let me know it would be on the move again early Sunday morning when they would be making a detour around an interstate overpass that was not rated for anything near the weight of the load. Here is the rig I'm talking about.... The trailer, as rigged, is 300 ft. long all by itself. There are 36 rows of axles, each with 8 tires. (288 total) These can be augmented with up to another additional 80 wheels on hinged outriggers, for a total of 368 potential flats.  Add in 5 each 10 wheel heavy duty road tractors (2 pulling and 3 pushing)  and that flat tire potential rises to 418.  The outriggers are not deployed in these photos, so the total tire count, for the moment, is 338. The load then had to negotiate the 90 turn seen in the photo. This had to be done while keeping all 338 tires solidly on paved surfaces. Note that each axle is steerable so it's only a little less exacting than a tap dancing centipede, but an on board computer system has things well in hand. It doesn't fully control the action since there is a "driver" in the chain of command. Here the action as begun and the lead tractors are making their initial turn. As things advance, dozens of power crews are on hand to clear overhead wires and there are hundreds of  other support crews and dozens of support trucks waiting to fall in line behind the convoy.  Notice that each large truck has a box firmly anchored over the rear wheels. Those are 18,500 pound weights which give the truck the needed traction this load requires to get it moving.  Looking closely at the rear section of the trailer, you'll see it is sitting at about an angle of 45 to the rest of the load. Once the main load was aligned as they wanted, the rear section crabbed and adjusted until it was in line and ready to travel. It was a strange action to watch but it worked perfectly. Here is a shot of one of the two "Drivers" The computer might tell the all wheels how much to turn, but this guy tells the computer when to do it and how much at a time. He's apparently pretty durable since the dawn temperature was a chilling 25 as he began his ride. Here you can see how the immense weight was distributed across the trailer sections as well as the hinge points for the support bridge. Both ends are supported in this fashion, making the whole rig a lot more flexible than it might first appear. Those outriggers I mentioned are clearly visible along the outer edge of the trailer.  The main bridge beams suspend the huge generator about 18 inches above the roadbed. When the job is completed, the round pins near the bottom edge can be removed and the beams can be stacked for their return trip home. Even up close they almost look too small to be holding that much weight up in the air. Standing near this beam is a little spooky. All kinds of pops and groans can be heard, even when it isn't on the move.