At the bottom of the ditch we have for sewer it's opened up large enough for a 330C L to sit down there and crane pipe in, which is why im guessing they dont make us pull a box. When the main hoe digs it he opened it up at the very bottom 5ft for a 36" pipe, but thats only the last 2 meters, it then steps up to 10ft wide. At the bottom of that hole the 330 is behind him craning pipe in, sanding and then he backfills 18" of dirt on top of the pipe and pads himself out for the next cut.
Backfill is carried out with my 973C Track Loader for the first 5ft above pipe, I get the first 2-3ft of dirt by cutting the walls out and spreading it, but after that we cut holes in the spoil pile and push dirt down in. I chase the pipe crew with the track loader and have a Dynapac Sheepsfoot 15ton packer with me. After me to fill the rest of the cut we normally use 2 dozers 1 to push dirt down and another to spread it around. For the spreading around we use a D8N since its a nice "trim" dozer as everyone calls it. For pushing down they bring out the real iron. We used a D10N and for awhile a D10R. He pushes a mountain of dirt down in the hole and if the 8 gets too far behind... you make a ramp and fire the D10 down in there and spread with it.
I agree with the pre trenching with a big hoe, instead of scrapers. One 385 can swing around 12,000 cy per shift in those conditions. It would take several scrapers and support equip to match that.
2 385's, a D10N, D9N, 2 973C's, a couple 330's, a 375L, 4 or 5 packers, 2 or 3 966 loaders, and for a hoe pack.. a Link Belt 210LX or a 710G John Deere backhoe.
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What do you think... :slomo
Looks like he raised the cab to avoid getting wet on his feet.