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Deep Pit Excavation

 
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Old 06-05-2019, 02:20 PM   #1
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Deep Pit Excavation


Hi, I am trying to get an idea of the equipment needed and timeline to excavate a 20x80 by 60 feet deep pit. I am assuming that 2 or 3 excavators will be used on benches to haul the soil out of the pit, about 30,000 CY.

How many excavators should be used and how many yards of dirt can each excavator move in a day?

Thanks
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Old 06-05-2019, 03:50 PM   #2
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Re: Deep Pit Excavation


Usually works out to right in between 3.49 and 3.51

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Old 06-05-2019, 03:59 PM   #3
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Re: Deep Pit Excavation


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Old 06-05-2019, 04:48 PM   #4
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Re: Deep Pit Excavation


Quote:
Originally Posted by Big Johnson View Post
Tree Fitty.
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Old 06-05-2019, 05:00 PM   #5
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Re: Deep Pit Excavation


how many yards in a day?

depends on:

soil type
size of machine
size of bucket
skill of operator
set up time

the biggest time burners will be load out time & truck round trip time.

you listed yourself as a c12 guy, you should know these answers prior to bidding.
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Old 06-05-2019, 06:59 PM   #6
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Re: Deep Pit Excavation


I don't know much about excavation but I'd have a pretty solid shoring plan in place for that sort of dig.
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Old 06-06-2019, 01:02 PM   #7
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Re: Deep Pit Excavation


You can either bench it per OSHA, slope it per OSHA, or use some type of sheet pile or shoring system which requires an engineer to design.

Is it inside a building or outdoors? Working in deep excavations is a pain. Productivity goes way down because everything has to come in / out via crane, etc., time spent going in and out, etc. You also need air monitoring the entire time anyone is down there and will need some type of stair tower or access system to get in / out. Need a crane and stretcher on site and an emergency evac plan and way to get an injured worker out safely, etc. I would definitely have a full time qualified safety man on a job like that at all times. Dewatering will likely have to be considered also. Honestly, the digging is the easy part.

I've done a bunch of these type projects and the fact that you are asking such simple questions, makes me think you would be much better off walking away or subcontracting this job to the pros who do this sort of thing every day. If you don't know what you are doing on these deep pits, you can easily get someone killed and real good chance you might lose a bunch of money.

Last edited by Fishindude; 06-06-2019 at 01:05 PM.
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Old 06-07-2019, 10:30 AM   #8
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Re: Deep Pit Excavation


Thanks Griz & Fishindude, I am not doing this job, but I want to educate myself on how such a job is done and work out the details. So, the proper way of doing this is to use 3 scrapers, one at the surface, one 20ft down and another at 40' down. The bottom scraper digs and places dirt on the second bench, a truck road is built down to the second bench to haul the dirt away, would that be right? Like the picture attached.
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Deep Pit Excavation-rate-analysis-excavation.jpg  

Last edited by taz1234; 06-07-2019 at 10:35 AM.
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Old 06-08-2019, 04:39 PM   #9
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Re: Deep Pit Excavation


It's not that simple, and that pit in photo looks to be 30' deep max. Get's pretty tricky at 60' deep. Really depends on how much site you have to work with and the soil and water conditions. Handling that material 2-3 times or more is not cost effective.

Might be a good application for a conveyor? They also have some pretty impressive long boom excavators if there is room enough to use one.
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Old 06-09-2019, 01:37 AM   #10
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Re: Deep Pit Excavation


If someone wanted to move 20,000 yards for < 4,000 yard (actual # 3,550 less overdig), hole

I'd remove their phone # from all my phone books........

CT needs a sidewalk super FAQ.

Brownfield work, like NYC?

Union/Mob area?

Crazy regulation area, like federal project/land, Or Californiastan?

Traffic issues for spoil trucks/ barges....

Sale of spoil?

On or off site back fill storage.....

Any chance of large rocks/bedrock requiring blasting.

Dewatering, maintenance pumping, caissons needed?

SWPP? DNR permits, local subsidence of neighboring foundations, See San Fran tower Sue fest......

I would class your dig as a large trench, longer and DEEPER then wide.... 20 foot dimension severely limits size of equipment used in the hole.....100 H.P. track loader? front hoe?

Soil engineer, and skilled shoring contractor / engineer.

Sadly the permitting process-building permitting is so-----drawn out the actual digging, barring extraordinary rain events, would be the trivial issue.
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Last edited by Fouthgeneration; 06-09-2019 at 01:40 AM.
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Old 06-09-2019, 08:46 AM   #11
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Re: Deep Pit Excavation


Quote:
Originally Posted by taz1234 View Post
Thanks Griz & Fishindude, I am not doing this job, but I want to educate myself on how such a job is done and work out the details. So, the proper way of doing this is to use 3 scrapers, one at the surface, one 20ft down and another at 40' down. The bottom scraper digs and places dirt on the second bench, a truck road is built down to the second bench to haul the dirt away, would that be right? Like the picture attached.
Sorry, but a scraper in mass excavation terms is one of these
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Old 06-09-2019, 10:44 AM   #12
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Re: Deep Pit Excavation


Oops, I meant to say excavator. What's the bucket size on a long boom excavator, do they go up to 5 yards?
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Old 06-09-2019, 11:50 AM   #13
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Re: Deep Pit Excavation


BTW, in some jurisdictions if the material is hauled off site, it's a mine and you have to conform to all local and MHSA rules and regulations.

Last edited by hdavis; 06-09-2019 at 12:24 PM.
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Old 06-09-2019, 01:02 PM   #14
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Re: Deep Pit Excavation


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BTW, in some jurisdictions if the material is hauled off site, it's a mine and you have to conform to all local and MHSA rules and regulations.
I think the limit here is 1000 yards. Not 100% positive on that #.
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Old 06-09-2019, 01:23 PM   #15
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Re: Deep Pit Excavation


The SWPPP could be a rather significant component on this project.

I wouldn't worry so much about the size of a bucket as I would be more concerned about the cost of the machine. They aren't cheap.

Also, your insurance company may impose conditions.

The safety precautions/plan is going to be rather significant cost also.
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Old 06-09-2019, 01:32 PM   #16
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Re: Deep Pit Excavation


Quote:
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I think the limit here is 1000 yards. Not 100% positive on that #.
Over in Brunswick, if it stays offsite, you're a mine and have to go through all the zoning etc. No lower limit IIRC.

In actual practice, material may be hauled off site and then returned. It isn't unusual for some to get lost....
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Old 06-09-2019, 01:41 PM   #17
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Re: Deep Pit Excavation


If you're willing to pay, you could get a 20 yd bucket on a 80' boom, but the machine that would go on isn't going to be easy to transport. It's more in the mine equipment category.
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Old 06-09-2019, 03:01 PM   #18
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Re: Deep Pit Excavation


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Oops, I meant to say excavator. What's the bucket size on a long boom excavator, do they go up to 5 yards?
Don't know on that one, but if you contact your local CAT dealer you get all those questions answered.
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Old 06-09-2019, 04:38 PM   #19
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Re: Deep Pit Excavation


I checked, Cat has as big as an 8.5 yard bucket.
The machine that can handle that bucket probably would not fit well on a 20 x 80 lot.
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Old 06-09-2019, 09:54 PM   #20
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Re: Deep Pit Excavation


First 15-20 feet with track back hoe excavators at grade...

Two or three cranes, lifting "skips" think dump box off dump truck..

craneable backhoes/ track loaders, ,< 15-20 tons for next 40 feet down....

OSHA shoring all the way down and dewatering in most parts of the USA.....

less then 30 days equal at least 200 yards a day/ 25 yards an hour production, finish in ~21 working days barring bad weather, etc..

millions of people could dig the hole, only a few thousand could shore it a safe and ECONOMICAL manner. IMHO

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