Anchor a gazebo without drilling into concrete

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diynonstop

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We have a 10x12 canvas top gazebo with a steel frame. My husband refuses to drill into the newly pour concrete slab.
I was thinking we could anchor it down by using 35 pound concrete planters filled with play sand and river rock, and topping it with 3 inch think flagstone pieces. Maybe even put sand inside the bottom 1/3 of the hollow gazebo legs. This would probably bring the weigh to around 100 pounds per leg. Felt confident this would work. But … Last night it stormed and I heard the wind ripping across the house. Maybe 30 mph winds. I fear 100 pounds per leg wouldn’t be enough. Neighbor has the same one bolted down to concrete and it was fine. Cant make a mistake because if this thing breaks free it will end up in the pool tearing the new pool liner $$$$.
How much weight would be enough? Other ideas on how to weigh it down?
 
With a 30 MPH wind the wind force per sq foot would be about 2.3 pounds x 120 = 276 / 4 legs = 69 pounds per pot.
 
. . .refuses to drill into the newly pour concrete slab.

if this thing breaks free it will end up in the pool tearing the new pool liner $$$$.

"The assumption is that the greater the number of ideas generated, the greater the chance of producing a radical and effective solution."

Run two galv. steel cables under the slab using a >12' pole/pipe from HD and strap the thing down. Then clean and return the pole.
If you use a pipe you can force water into it so it digs its own path. If you hammer it in you may need a comealong to extract it.

2nd option, anchor a cable with a strong spring to something else with the cable too short to allow the tearing. Bury the cable so it's not ugly.
This is what we do with beach umbrellas and a screw in dog anchor so nobody gets impaled by our umbrella.

BTW, your is killing me. :(
 
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Fill a 5 gallon bucket with mixed concrete and set the leg of the structure in the concrete. Form it up to maintain plumb on the leg while it sets up. Repeat for the other 3 legs and decorate as desired. You can leave the pour in the bucket or break away the bucket to reveal the concrete base. :2cents:
 
With a 30 MPH wind the wind force per sq foot would be about 2.3 pounds x 120 = 276 / 4 legs = 69 pounds per pot.

Bud, your reply astounded me. :clap: How did you come up with the wind force per square foot? Is there a formula?
 
On iPhone now but will give explanation later. Took into account up flow as used total area in calculation, worst case.

Correct if you can't dazzle with brilliance baffle with BS.


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Wuz you are the dirty dog that filled my new water pipe with dirt that time. Glad I switched to PEX.


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http://www.bristolite.com/interfaces/psi_wind.aspx

Here is a good explanation of the formula I used.

Sorry Wuz for calling you a dirty dog I didn't know that was no longer in the vernacular. I'm never PC about these things. :)


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You could use 'filthy cur' but nobody would know what you're saying. :(
A modern curse word has to do with having carnal knowledge of a close female relative at least 10 or 20 years older than you. :D
 
If you do the concrete buckets, you'll have to figure out where/how to store them in the off-season, and assembling the tent in the spring (assuming that this a seasonal set-up) will be a bear. Does your gazebo have a place for tie-downs? You can use guy lines that anchor to pegs beyond the concrete slab. These could be used only when winds are expected.

Another option is the use of weighted plastic sleeves that the pole (leg) slips though. You can find these online, but I don't have a brand name for you. I use old plastic-coated weights from a gym set. About 30 lbs each - 1 weight per leg.
 
After reading all these ideas I bet he changes his mind and drills the pad. ;)
 
Depending on how big the slab is, perhaps anchers could be attached to the edge of the concrete for tile down strap or something.
 
With a 30 MPH wind the wind force per sq foot would be about 2.3 pounds x 120 = 276 / 4 legs = 69 pounds per pot.

I used the link to the formula and came up with
Area 120 x Wind Pressure 2.304 x drag 2.0= 552.96 / 4 legs =138.24 pounds per leg... not including uplift and wind vibration.

Now, I am absolutely convinced that he must drill into the concrete and put those 4 bolts per leg into that beautiful concrete. 138 pounds is like having a grown up sit on each leg and hold it down.

I will use our small pop up tent to figure out the exact location for the permanent one. That way we wont make any mistakes on drill spots of the 10X12 gazebo.
Thanks for your help, I am completely freaked out.
 
BTW after looking closer at the gazebo roof does have a vent. Not sure how well it works, but that would help relieve the pressure. Plus the canvas roof does come off. I (he) could take the canvas in down in the winter and just leave the frame up.
Either way roof on or not, It needs drilled down and attached to the huge pretty new concrete pad.

Hubby just needs to cave in and let me win this one.
 
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