How far out can I extend a structure supported on one end?

[LD1]

Hope you take the time to figure out just what you need to anchor the beams to the concrete. Lots of rebar, anchors, J bolts, etc.

Simply sitting beams on a block of concrete, and pouting more overtop I don't think will hold well

 

[Streetcar]

If you encase the ends of the beams in the end foundation, you will have integral foundation and just need rebar.
The integral foundation can have soil placed against it for smooth transition from ground to dock

 

[aczlan]

If you encase the ends of the beams in the end foundation, you will have integral foundation and just need rebar.
The integral foundation can have soil placed against it for smooth transition from ground to dock

I would make sure to weld the rebar to the beam before pouring the concrete so that you are pulling "up" on the bottom of the block (rather than trying to split the block in half).

Aaron Z

 

[LD1]

I would make sure to weld the rebar to the beam before pouring the concrete so that you are pulling "up" on the bottom of the block (rather than trying to split the block in half).

Aaron Z

That's sort of what I was eluding to. Only I was envisioning looping the rebar over the beam like a big horseshoe, and letting it embed in the concrete all the way to the bottom. And maybe a few bends at the bottom to make it like j bolts.

Think upside-down horseshoe with the legs looking like j bolts.

 

[ning]

Thinks it will be a mosquito noisy frog haven. We are blessed with no mosquitos now.

There are many ponds around where I live. The frogs can be deafening at time, but it's a "good noise" IMO.
It always gives me pause when they all suddenly shut up!

Re mosquitos: Bats. Lots of bats. There are definitely a lot of mosquitos around the pond, but 100y away at my house there aren't nearly as many. Our house's deck (between floor 1 & 2) has a band around it which stands about 1" off from the house, leaving perfect slots for bats to live in - I'm guessing that there are about 50 living here now, and come evening you can see them flitting around eating bugs.

Dragonflies are also mosquito predators - their larval stage mostly eats mosquito larvae.

There are also non-toxic mosquito controls you can use in a pond ("mosquito dunks" - bacterial and acts against the larvae). I've considered using some occasionally but the bugs for the most part don't bother me, probably because of the bats & dragonflies.

 

[Streetcar]

Easier way to anchor beams Is cut hole in web and thread rebar through hole. Rebar over beam will have little cover as overlay is only 2" on beam

 

[MossRoad]

I would make sure to weld the rebar to the beam before pouring the concrete so that you are pulling "up" on the bottom of the block (rather than trying to split the block in half).

Aaron Z

Excellent point. Anchor it to the bottom of the block. However, I still wouldn't make it "diving board" style. I'd run beams back the same distance behind the pier as in front of the pier and put a second pier on the landward end. He'd end up with double the walkway, and it would be neutrally balanced forever and eternity. Plus he'd have a counterweight for the inevitable "too many people on the dock" scenario. He could get away with a smaller pier at the water's edge as well this way.

 

[bdog]

Well guys I met with an engineer today. Kind of crazy he recommended the same size beam I was thinking based off my internet calculations. He is finalizing his design but most likely it will be three W21X44 beams.

They are still working on the volume of concrete needed but the plan is to dig a big hole with the backhoe and set two I beams in the hole running perpendicular to the dock with the tops at ground level. One at the waters edge and the other 10' back. We will then weld a bunch of rebar to them, etc and fill the hole with concrete leaving the tops of these beams exposed. The long 40' I beams will then lay on top of and be welded to the I beams embedded in concrete. Then concrete will be poured over the whole mess.

 

[MossRoad]

Well guys I met with an engineer today. Kind of crazy he recommended the same size beam I was thinking based off my internet calculations. He is finalizing his design but most likely it will be three W21X44 beams.

They are still working on the volume of concrete needed but the plan is to dig a big hole with the backhoe and set two I beams in the hole running perpendicular to the dock with the tops at ground level. One at the waters edge and the other 10' back. We will then weld a bunch of rebar to them, etc and fill the hole with concrete leaving the tops of these beams exposed. The long 40' I beams will then lay on top of and be welded to the I beams embedded in concrete. Then concrete will be poured over the whole mess.

Sounds excellent! Pictures when you start the project will be appreciated (and drooled over, no doubt).

 

[Egon]

Well guys I met with an engineer today. Kind of crazy he recommended the same size beam I was thinking based off my internet calculations. He is finalizing his design but most likely it will be three W21X44 beams.

They are still working on the volume of concrete needed but the plan is to dig a big hole with the backhoe and set two I beams in the hole running perpendicular to the dock with the tops at ground level. One at the waters edge and the other 10' back. We will then weld a bunch of rebar to them, etc and fill the hole with concrete leaving the tops of these beams exposed. The long 40' I beams will then lay on top of and be welded to the I beams embedded in concrete. Then concrete will be poured over the whole mess.

Now that sounds good!