Anyone know of a supplier in Pattaya for anchor bolts.

The kind where you drill the hole in the concrete and then set the bolt in a two part epoxy mix.

Tried the ones that expand and lock in the holes but they eventually get loose.

Cheers

Sorry, should add looking for about 5/8ths diameter. Max number to buy 6

1/2", 5/8" wedge anchors don't get loose if proper length and embedment and are installed in good structural concrete. ok, lots of 'ifs' there... if you use epoxy anchors, make sure you blow the conc dust out of the holes, else you'll get nothing.

Agree with bbradsby, expanding anchors do not normally work loose, what are you fixing and in what structural material?

If you do insist on chemical anchors, Hilti have a local office and website so should be able to advise on a retail outlet.

Agree with bbradsby, expanding anchors do not normally work loose, what are you fixing and in what structural material?

If you do insist on chemical anchors, Hilti have a local office and website so should be able to advise on a retail outlet.

The base for the bolts is a solid brick built pillar and the expanding bolts tend to crack the bick substructure

I am thinking on the lines of epoxy bolts as they would tend to hold it together rather than crack it. Hanging a gate by the way

The base for the bolts is a solid brick built pillar and the expanding bolts tend to crack the bick substructure

I am thinking on the lines of epoxy bolts as they would tend to hold it together rather than crack it. Hanging a gate by the way

Got it. You may well find that the chemical anchors will just pull out too

Do you have access to the other side of the pillar? If so I would install a steel backing plate to spread the load and bolt right through.

Access all around the pillar so will look at that option, it's about 12" square so will need to source a long masonary drill.

The usual Thai red brick & ungrouted block are not good supporting anything but lightweight/decorative items. if your gate is steel, or large in dimension, or both, my guess is your installation will eventually fail via anchor pull-out. you need a solid material for your anchorage, or a through-bolt with large washers as Crossy stated.

Probably do it this way using a 4mm thick steel strip

Probably do it this way using a 4mm thick steel strip

How about putting two steel bands around (one vertical strip) instead all these bolts?

Probably do it this way using a 4mm thick steel strip

How about putting two steel bands around (one vertical strip) instead all these bolts?

Thought about that but feel that with the strip going over the top it puts most of the force into the vertical on the pillar. 4 hinges to fit on the strip.

How about putting two steel bands around (one vertical strip) instead all these bolts?

Thought about that but feel that with the strip going over the top it puts most of the force into the vertical on the pillar. 4 hinges to fit on the strip.

I see what you mean. I think, with a gate there are not only vertical forces; the main issue is shear stress.

It might work, but you need sufficient mass above the two top bolts to deal with the shear stress. Unlike re-enforced concrete, brickwork cannot deal well with this stress; you need to compensate with vertical gravitational force through mass. Rings around the brickwork, especially in conjunction with strips on both side, might just give the extra capacity to deal with the shear stress.

Hope this makes sense. The blue line is where I think one critical point could be. I think.

Will probably do a belt and braces job by fitting a wheel to the outside edge the gate so that no real weight is put on the pillar. The pillar was built by Somchai and Sombat using the small red bricks around a 4 inch concrete post then cement rendered so probably not the strongest pillar in the world.

Will probably do a belt and braces job by fitting a wheel to the outside edge the gate so that no real weight is put on the pillar. The pillar was built by Somchai and Sombat using the small red bricks around a 4 inch concrete post then cement rendered so probably not the strongest pillar in the world.