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bridge for Island
We routinely have to build crossings for creeks, etc., and have found the two cheapest, easiest ways.
First, the down & dirty, get a flat highway semi-trailer, remove the running gear and drag it over the gap.
Secondly, and IMHO more time consuming, but more "user friendly" is to get two or three OWSJ's (Open Web Steel Joist) made the right length to span the gap. Join them as a single unit by welding or bolting cross-ties in place, then deck with your favourite flavour of decking material. If you have access to them, surplus sign boards work well. They are usually 3/4" outdoor grade plywood and have been well painted. Light steel decking, or even expanded mesh also work well.
Best of luck.
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bridge for Island
SG, any structural steel or even welding shop can make them up. For that matter you could do it yourself if you can weld.
They can be built in bolt together sections, but aren't very heavy by the foot anyways. Get full length units and just use a rope to pull them into place. I would think 2 or 3 guys could jockey them into position by hand.
They are just a long bent piece of rebar, sandwiched between 4 pieces of angle iron.
Best of luck.
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bridge for Island
Call me a cynic, but, here I go anyways.....
From the very limited amount of detail you can give in 3 or 4 sentences, and IMHO (as an engineer), it won't work.
For lot's of reasons.
First of all, the shear volume of wood itself in the structure. Bear in mind the first thing any structure has to do is hold ITSELF up, before you can even think about loading it further.
Assuming with where you're located, that it will be built using Southern Yellow Pine, and we know that dry SYP has a weight of 45 pounds per cubic foot of wood.
You said the beams will be 4" X 6" X 32' (in total), and there are 2 of them, as well as the decking of 2" X 6" X 4'wide. The beams will weigh about 475 pounds, and the deck another 960 pounds. We're up to about 1435 pounds, and we haven't even thought about the sides, railings, the steel, or the fasteners.
I would guess-timate that the whole structure would weigh in the area of 2,000 - 2,500 pounds.
Best of luck.
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bridge for Island
Beagle, I agree 100%, I was just trying to keep it in "Crayon".  .
That's also why I suggested clear-span with OWSJ's instead. ;->
Best of luck.
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bridge for Island
And here's yet another way to look at it:
Put a nice bridge over to the island $3,000
Build a nice gazebo on the island $2,000
Have a nice island you can walk to, with a lovely gazebo on it as a landscape feature, and have an appreciation of maybe $25,000 for a mere $5,000 investment.
I know what my wife would say, and boy am I ever glad my wife doesn't make the financial decisions.
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