Julien,
In actual fact you are not talking about an 'anchor' but a *MOORING*.

I belong to a Club which is one of the oldest on the Delaware River, just
North of Philly. It is a 'self-help working mans' club rather then a
'Newport Yacht Club'. Strictly sail, and everybody pulls their weight. Since
my Potter only weighs about 1200 lbs, I was thinking of doing something
similar with an old car wheel - which would have simulated a 'mushroom'
mooring anchor. ABSOLUTELY NOT allowed. {There were a couple that were
'grandfathered' . . . but they were RAILROAD wheels and 6ft pipes, weighing
about 900 lbs.} Depending on the boat {and personal preference} a 'single'
or 'double set' of mushroom {or one of the newer 'exotics'}anchors must be
used. The 'set-up' per the guidelines in 'Chapman's'.

We are on a river with a reversing tidal stream and a 7ft swing. About a
third of the field is hauled & inspected each winter. ALL the buoys are
pulled in late Fall . . . and the 'floating docks' as well. The docks use
'permanent' moorings that I understand are massive blocks of concrete. Where
this differs from the 'boat moorings' is that there is no 'bottom chain' and
riding chain' . . . it's all the same size. Also each 'float' is secured
with 4 chains that are 'crossed' like spring lines to hold everything in
place. It make for quite an adventure, twice a year !!

Regards & Good Luck,
Ron Magen
Backyard Boatshop

"Julien Mills" wrote in message
...
John Cassara wrote:

Thanks, everyone for the replies.

He was reading a book about dock building. I would infer he wants to
anchor
a floating dock.

Yes, someone read the op. Actually I am thinking about attaching the
pipes of a pipe dock to the cement anchors. I have a hard rock bottom
so I can't auger them in, or let them sink into mud.
I could go the floating dock route, but at the moment I am leaning
to a stationary dock.