What type of actual fence are you planning on building? That will really affect how strong the posts need to be. Overall, the bottom bracket you posted will probably be strong enough but we need to know some more information about the type of offense and the type of gate you plan on using.

 

I'm going to be using 4x4 6' high for the posts and 1x6x6 for the fence boards, the posts will be less than 6' apart and the gate is made of 1x6 and 43" wide

The gate I Am using is here http://www.homedepot.ca/product/treated-wood-gate-with-decorative-insert/941981


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Those after-thought post bases will not hold any gate. Wind alone will work them loose.
Either move the fence so you can dig post holes or cut the concrete.
I've done enough for family to know that they are most important customers, including all the cost cutting ways and mistakes.

 

From previous experience they're not really a great solution.

I tried using these with a small 3ft section of fence with a 4ft gate, both only about 3ft tall.

I used a Simspon version of that with 1/2 concrete anchors and lags and within about a week of opening and closing the gate the things started to come loose.

It's more work, but you could cut out the concrete where posts need to go and re-pour with proper anchors set into the concrete. And have a little more piece of mind that things will be secure.

 

Sorry I do want to do it right but also I'm just trying to avoid a huge amount of work by drilling into existing cement walkway not to mention it won't match. Are these good with epoxy holding them in the cement?

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Just an opinion... I'm with T Jansen...... not a sturdy lasting assembly.... but if it is mostly cosmetic and unused.... and cost/time/effort is important....

the epoxy (two part simpson) will hold.... the post base will wobnble.

Just an opinion/experience.

 

Ok...... Thx for all the replies looks like I have to rethink my approach


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That actually looks like the post base I used.

I'm not an expert here, some one else might be able to help a bit more. But you could try some epoxy underneath it might help, It might also loosen up with time and moisture.

If you want to go this route I'd say just to make sure those lag bolts are extremely tight, if those bases are any bit loose when you put the posts in they will greatly amplify it.

 

The loads on a gate will pull just about any surface mount loose. There's just not going to be enough contact made between the post, the mount and the underlying concrete to make it work. Sad to say your choices are limited.

 

I've run into the same issue with these anchors before. They just don'e provide enough support and I ended up re-doing the fence with proper anchors set in concrete.