The Piers
This
was a fun day for me - it was the day we really broke ground. Tim is using
his backhoe to drill the holes for the piers. I got to help by guiding
the augur back into the hole each time he brought it up to dump a load
of dirt. The bit is 16" in diameter and the extensions make the pole
16' long. We used the entire length to dig the 16' holes. Each hole took
over 30 minutes to drill. We finished 6 holes in the afternoon I worked.
There were only 96 more to do after that. Each hole went through about
6' of dirt, 9' of bedrock (sort of shale like stuff) and about 1' of "refusal"
- rock that is too hard to drill through. As it turns out, this is ideal.
The bedrock is good for holding the piers from sliding, and the refusal
will keep them from sinking.
For
all 102 piers, Devin and company tied the cages by hand. There are four
pieces of rebar (16' long) with these square pieces approximately every
foot. The tying took about a week for two people.
This
shows how much steel they delivered for the foundation. In the foreground
are the square pieces for the cages. In addition to 102 piers, the cages
are used in the forms for the walls as you can see in the next page of
this story.
This is
Devin hard at work on the day the concrete piers were poured. Here he is
wielding a shovel to dig a trench from one pier to the next. It was a hot
day and Devin had a lot to manage. His estimate of 63 cubic yards of concrete
to fill the pier holes was accurate. It took 7 concrete truck loads!
Because
the site is on a hillside and the piers are scattered, Devin hired a concrete
pump with a large boom. As you can see in this picture and the next, each
concrete truck backed up to the pump truck which stayed at the site all
day. Two workers moved the boom from pier to pier and filled them. It took
most of one day to fill all 102 holes.
This
is another view of the concrete truck, pump and boom. As you can see, the
boom was quite large!