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bridge for Island
time is running short tonight I will gather my thoughs and materials and post tommorow night.
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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
"Trying to get out the cheapest way and something I can do with little or no help"
I will go out on a limb here: Based on the structural requirements of the bridge you will not get away from this project without spending (when all is done and told) at least 2k. Thats the equivalent of 10 $200 lawn mowers if you assume no present vs. future difference in the time value of money. At this rate you could just buy a new lawn mower every year and leave it unprotected on the island. Also 2k will buy you a nice little John boat setup which you could use to get to the island and then use it elsewhere as well.
Here is another way to look at this:
Assume the bridge setup costs 2k. It's depreciated lifespan is assumed to be 15 years (i.e. in 15 years time you would consider it's value to be 0.00). Assume an annual depreciation of 20% in year 1 and 19% in year two and 18% in year three and so on. You could use your own estimates for this kind of sturcture - I assumed that in 5 years it will have lost approximately half it's value, if you think that's steep ask your accountant they will tell you it's not nearly a valuable as you think it is. The first year of mowing will cost you 400 dollars in depreciated bridge costs alone - say you mow 5 times, that's 80 bucks per mowing. In year 2 it will cost 304 dollars in depreciation costs or just over $60 per mow and so on. My point is that a bridge structure is a comparitvely expensive option and that's not what you asked for. Ask your wife if she thinks you need a 2000.00 bridge - I know what I would say.
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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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bridge for Island
Murf,
gazebo was what I could not remember my friend built on his island.
SG, since you are in Georgia you will need to add electricty to that for a ceiling fan to keep it sort of cool and the insects off. Also put in grill what a neat get away it could be.
My friend's island was used for their daugther's wedding. The wedding party on island and guest were not. Great set up.
kt
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bridge for Island
I guess it depends on whether you are in the maximist or minimist camp. Looks like I am one of those in the latter and from where I stand looks like there aren't many of us 
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bridge for Island
Ann
you are determined to get me behind a push lawnmower. You think I am nuts, I have not discussed this with the wife. She works with an accounting firm you and her would have me swiming to the island with hand shears.
Murf
a gazebo the same size of the Island I would not have to cut anything, might as well add a bar. With the bar I would surly need hand rails on the bridge.
KT
I still have one to marry off so the wedding party sounds good to me.
Beagle
Went to the local buy any thing store, met a guy that builds docks. He has two 55' 12" X 12" treated beams that he builds docks from. I can cut them to suit. He gave me the number of a person who may already have beams cut to size I will check with him tomorrow. At the store this guy had bought floats for a dock and his customer backed out. They are 3' x 4' by 3' high thick plastic, you for some reason cannot use styrofoam for docks any more. $90 for the floats apiece the beams $140 to $150. Is this a good start. The floats are if I need a floating dock. Might get the foats for future use.
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bridge for Island
I think we can make this work, and have a decent looking bridge. The 12x12 timbers are border line for the 32 foot span, whick means they are in the stress range, but will probably feel soft under load.
What I would suggest is doubling the 12x12 for the center 23 feet of the bridge. If you can picture this, span the 32 feet with the 12x12 timber, then reinforce the BOTTOM of the center 16 feet out of the 23 foot drop. You can use the whole 23 feet (recommended) if you want. We can get a good shear connection between the two timbers with through threaded rods on 24"C/C, and three rods at each end. In other words, your bridge girder will be 24" deep for the center 16 or 23 feet, whatever you decide.
If that sounds good for the girders, we can start looking at the stringers and deck.
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bridge for Island
Ok lets say I have two 12 x 12 33long side by side spaning the to the Island. you lost me with the reinforcement 16' and I dont have a clue about the 23'. were you thinking I was only using one 12 X 12?
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bridge for Island
Ok, let's try again. you need to but both 55 foot timbers. You'll have 2 12x12 timbers spanning to the island. For the center 16 feet of the 33 foot span, you will add another piece of 12x12 to the bottom of each girder. So for the center 16 feet, the girder will be 24" deep. We'll take a pice of what we cut off the 55 foot timber and add it to the bottom for the center 16', through bolted to the 33 foot long timber.
33'
Land--------------------------------------Island
--------------------
16'
Side View of Girder
Hope fully the diagram above helps. The girder is 24" deep for the center 16'.
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