In article ,
"Dan Listermann" wrote:

I have built a floating dock from treated 1/2" 4 x 8 plywood, skirted with
treated 2x4s and supported by 9 cable restrained 15 gallon plastic barrels.
Currently I have two of these tied together with 8' 2 x 4s using lag bolts.
The resulting dock is 8' x 8'. I want to double the size with two more
sections for a total size of 8' x 16'.

The river floods occasionally so I will want to be able to take the docks
out. This will involve dragging them up about 12' of bank. I want to
disassemble the four sections to do this. I am looking for a way to connect
the four so that they can be easily disassembled and reassembled without me
getting too wet in the winter. So far, I have bought hanger bolts and wing
nuts that I intend to use with 16' 2x6 boards on either side. This will
work, but it will be very tricky to get all the holes aligned at once.

Any suggestions?

I'd be tempted to use eyebolts and something to join them with--such as
"quick links" or a vertical pin of some sort. Both of these assume that
the sections don't have to be absolutely rigidly attached to each other
(although the ring-and-pin approach could be made nearly rigid).

If you wanted to go with the 2x6 approach, you could at least split the
16' length into sections that only cover one joint, so it's only
necessary to line up two sections at any time. That may, of course,
force you to keep track of more wing nuts and washers and whatnot, and
that (if you're like me) means more fishing around the bottom of the
water for nuts and bolts.

--
Andrew Erickson

"He is no fool who gives what he cannot keep to gain that which he cannot
lose." -- Jim Elliot