How much of a difference production wise can I expect from loading 40 Ton offroad trucks at the bottom of a 10-12' cut as opposed to loading them at ground level? What kinda yards do you think I can get in a decent 12 hr day? 4yd bucket, standard stick and boom.
How many trucks? You will definitely save probably close to 20-30 seconds per truck if you can get them to run below the hoe as opposed to next to it on the same level. When we have 40-tonners being loaded by 345's it usually takes 6-7 passes per truck, so about 90 second load time (if your in good digging material, rock or really hard clay will slow it a bit). If the trucks are running consistently and the hoe doesn't sit much, figure about 3 minutes per truck (load, wait time) 20 loads an hour or 240 loads a day, how many yards, depends on how many yards per truck you plan to claim (I think we claim 24 yards, so 24*240=5760 CY a shift). I'm just roughly rounding the numbers for ease of the brain, it's late, hope that helps though:drinkup:usa
We will have as many trucks as it takes to keep it swinging regularly... I'm thinking 3 trucks per machine, the haul is gonna average about 700'. I think I can get the bottom hard enough to run on, it's the ramps out I am worried about. They are always the hardest spot to keep hard. Trying to see if it's worth cutting lime or flyash on 10 or so ramps. We are digging a new channel 8000' long 16' deep and 200' wide.
I estimate a 20 second per load savings putting the trucks in the cut. I do not know how hard or soft your digging is. I was in pretty tight cobble rock and getting 200 to 210 in a 12 hour day recently. That was with an older 345BL swinging a 60" bucket. In nice material where the 72" bucket would dig easily, I think I could do 240 easily. On the rare occasions we hit a soft spot in the cut, we would average 21 to 22 loads per hour. The hoe was always over the trucks. Our haul was about 600 to 800 ft, and 2 trucks worked out fine. If the digging was easier, then 3 would do, with one truck waiting about 1/2 minute each time, on average. As for yardage, I don't know what Jim hauls to get 24 yards of it in a truck, but I usually end up at 18 to 20 bank yards per load, and my loads are FULL. I also know people who claim more, but the survey does not lie, and I don't want to think I am done and still have 20% of the dirt to haul.
Jerry, Not gonna lie, I was just grabbing numbers a bit... We mostly run 30-tonners and claim 14-15 yards on them. You're probably more accurate with 20, we may go 22 though. I think job to job the claim number can change depending on what we have (ie rock or sand or clay). Didn't mean to throw anyone off, like I said we don't 40 tonners as much as we used to. I do still think you can get 5500-6k yards a shift from one of the hoe/truck packages though. As long as the trucks can move and the digging is moderate to easy.
That's what I was hoping to hear, there is 0 hard digging in Louisiana, at least in my area. I am goin to have 3 349e's with 74" buckets and one 345c with same bucket. 5,000 yards would be 20,000 yards, we are spreading 1' thick lifts that the compaction requirement is 3 passes with a haul truck. What Would you guys think it will take or What would you use to spread the material? Im hoping to get a 1.5 conversion factor and haul 20yrds/truck. Will 2 d6n's w gps, a d6t, and a D8L keep up spreading, with the haul roads, (will have tractor and blade also) and grade the cut?
That is a good sized operation! I'm interested to see how the new 349 compares to the 345 c.
Good luck, whenever the project gets going, keep us up to date and share some pictures too:drinkup
Crazy The way I would see it the 8L will handle what 2 hoes will send, and the 6N's will each handle one, leaving the 6T for the cut and haul roads. It may not work out with the exact machine doing what I said, but the point is there is enough support to make it work. Sounds like a busy site. My only concern is to have a large enough fill area to get the compaction requirement met. Jim. I wasn't trying to bash you, and hope you did not take it that way. Your advice is on the money most times and valued by me and a great deal of others. I want to see pictures as well. Sounds like a busy site.
We will have 200 acres to spread the fill on, I'm hoping the dozers work out like you said. The 349 is a bit faster and more powerful than the 345c, a noticeable difference. I will try to take some pictures. I have a ton of pics just don't know how to put them on from my iPhone.
Are the 349's L or LME? here in the UK I have never seen a L we all use LME most of which carry a slightly oversize bucket of 4M3, which equate to 5 passes on a Cat 740.
Just L.. I don't find the lme's load faster cause of all the changing conditions throughout the job.