I would just hire a contractor to do the job. Its a one time need only, so renting equipment and training yourself saves very little.
View attachment 661414 this is a rock i found with a 24 auger. It was mounted to skidsteer.
Isnt there any rental yards in your area? I rented a skid steer with 24 auger for $200 for 3 hours use when i set my front porch. Rental yard 20 min away so it wasnt bad. No way my 45 hp kioti would have pushed that auger into the ground
This is exactly why I got a M62. I can just throw a HYD auger on the front and drill whatever I want. Rental is 45 min away but doable.
His piers could be 6 feet deep. Good luck with that shovel.
How much more in concrete costs will the horizontal piers cost ya? When I looked at this it was quite a bit more than a vertical cylindrical pier.
What do you do if you hit the rock with a big augur?
Speaking of large augers. I have ten power poles down the side of my driveway. I thought they would use a 12" or 18" auger to dig the holes for the poles. Boy - was I ever wrong. A HUGE semi truck with a gigantic hydraulic auger mechanism and a 3" auger. It would auger and also could operate as a rotary hammer.
So they auger/hammer a 3" hole down as deep an necessary. Then they drop some type of electric detonator to the bottom of the hole - fill the hole with high nitrogen fertilizer( I guess). Pack the top tight with dirt and heavy rock. Run the electric connection over to a truck parked about 150 feet from hole. Everybody crawls UNDER the truck and they touch it off. A mighty ROAR - rocks flying everywhere - a cloud of dust. They now have a hole big enough to drop a power pole into.
Eight of the ten poles had to be "developed" by blasting. Basaltic lava bedrock is very close to or at the surface.
At my request - they came down to where I was working on the house and I got to witness two of these operations.
How many piers? Get an 8" augur bit, lay out the 24" hole,
drill 3 holes around the perimeter, and use a shovel to finish it?