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Stiffening floating "T" dock gangway from twist
#518108 03/18/20 03:25 PM
Joined: Mar 2020
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Dock has a 16'x5' section connected to a 4'x12" Platform. Has floats on the far ends of the 4'x12' and 2 floats at the head of the walkway / 16'x5' portion.

Bouncing on a far side of the beginning of the walkway produces some twisting / torsion on the walkway to the ... other... section.

Any thoughts on how to minimize this twist that don't involve repositioning the walkway floats / excessive framing?

My thoughts are of the Tacoma Narrows bridge sans oscillating feedback loop

I was going to include an ascii diagram of the framing but it would be way too phallic. I didn't account for that when designing it. I blame Excel.


Last edited by Nobbler; 03/18/20 03:26 PM.
Re: Stiffening floating "T" dock gangway from twist
Nobbler #518114 03/18/20 08:52 PM
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Inverted truss system using 5/16 or 3/8 solid steel rod. Flats welded to rod ends with a hole. steel bracket with stand-off in center going down about 1.5' (actual length depends on walkway length), rod is bolted solid at one end, welded to center stand-off then bent down and bolted to opposite end.
Both sides need to be done at the same time because after rod is welded in center, walkway has to be jigged in a fashion that allows being loaded "up" slightly in the center so when you attach rod at opposite end and walkway is put back in place it loads the steel rod.

Last edited by Snipe; 03/18/20 08:53 PM.

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Re: Stiffening floating "T" dock gangway from twist
Snipe #518130 03/19/20 09:42 AM
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Thank you, that was exactly the answer I was looking for!


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