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SPECIAL ANCHOR BOLT

SPECIAL ANCHOR BOLT

SPECIAL ANCHOR BOLT

(OP)
Hi,

I have pile cap having both the cases given below
Case-A
The pile cap supporting column with base plate and anchor bolt .
Case-B
The columns are removed along with the base plate and anchor bolt , Crane would be moving over the pile cap.
To satisfy the above cases the ANCHOR BOLT must be of an removable type, as well as the above two case occurs continuously , means after some time columns are again supported and anchor bolt is again fitted in the same location .

Please suggest what type of anchor bolt should i use in this case , Please also note that the above two cases are occurring in corrosive environment. No Hiti Bolts are Acceptable as well for above case.

Please find the two cases attached with the link below
http://files.engineering.com/getfile.aspx?folder=e...
http://files.engineering.com/getfile.aspx?folder=8...

RE: SPECIAL ANCHOR BOLT

You could install an embed plate with anchor rod couplers welded to the underside.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: SPECIAL ANCHOR BOLT

(OP)
Can you please explain with picture i couldn't understand sorry, Please not the anchor bolt is subjected to shear and moment

RE: SPECIAL ANCHOR BOLT

Will the column have to be removed and re-installed more than once? Or is this a one time thing?

If this is a one time thing you may have consider an embedded plate and welding the baseplate to the embedded plate. When need to be removed just grind off and re-weld later. Obviously not a solution if this is being removed frequently.

I think what KookK was getting at was welding a coupler to the underside of the baseplate (coupler would be cast in concrete) then you could thread your anchor bolt down through the baseplate into the coupler.

RE: SPECIAL ANCHOR BOLT

I would just call it a ferrule, appropriately anchored, of course. Screw the bolt in and out as required.

RE: SPECIAL ANCHOR BOLT

(OP)
Hi how i would remove the anchor bolt can you please explain me

RE: SPECIAL ANCHOR BOLT

(OP)
Any body having alternate solution can please post there views, It is difficult to weld and cut many times hence embeded plate with weld could not be used.

RE: SPECIAL ANCHOR BOLT

As JAE mentioned, you just need couplers on your anchor rods. You don't need to have a cast in plate. I only suggested one to ensure accurate placement of the couplers. You could also achieve that with a forwork template.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: SPECIAL ANCHOR BOLT

(OP)
By the way is there any couplers would rotate with anchor rod , or some sand might fall inside the coupler and would result in a mess .
Just intrested to know more .

RE: SPECIAL ANCHOR BOLT

(OP)
I am expecting an alternate soltuion if i am not using Coupler.

RE: SPECIAL ANCHOR BOLT

Here's a similar condition using couplers. If you're worried about sand and plastic caps won't do, you can get metal caps.

Frankly, it's hard to imagine a solution that:

1) doesn't project above the surface,
2) doesn't involve welding.
3) doesn't involve couplers.

Your problem may be over constrained.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: SPECIAL ANCHOR BOLT

I don't think that coupler rotation will be a problem. However, if you're worried about it, have the couplers welded to an embedded plate.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: SPECIAL ANCHOR BOLT

You could drop the top of your cap 8" below grade, install normal anchor bolts, and fill the 8" with lean mix concrete to be chipped out and sandblasted later.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: SPECIAL ANCHOR BOLT

(OP)
HI thanks for your suggestion , Can any body tell me weather hilti has couplers like above.

RE: SPECIAL ANCHOR BOLT

(OP)
Hi can anbody suggest Galvanized coupler and anchor bolt for the above discussion

RE: SPECIAL ANCHOR BOLT

I would specify F1554 anchor rods and, per the recommendations of the F1554 specification, either A194-2H or A563-DH heavy hex coupling nuts which can be galvanized. If you foresee welding any of this hardware, I'd stick with grade 36 F1554 hardware. I think that the other grades can be made weldable but I wouldn't bother trying unless grade 36 didn't work out for some reason.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: SPECIAL ANCHOR BOLT

As an alternate path to consider: If the crane access is just temporary and only a few columns need to be removed and restored, can you just protect your original cast in place anchor rods by using a combination of timber (crane) mats and compacted fill? This can be removed later, leaving the anchor rods undamaged.

RE: SPECIAL ANCHOR BOLT

(OP)
Hi everybody i am back from where i started.
Finally we arrived a anchor bolt based on the sketch below but water would enter into the sleeve and corrode the thread rod and sleeve can anybody suggest a good solution .
http://files.engineering.com/getfile.aspx?folder=3...

RE: SPECIAL ANCHOR BOLT

Use the same detail, but with stainless steel.

RE: SPECIAL ANCHOR BOLT

(OP)
Hi we have thousands of supports like that wood timber mat would be more expensive.The entire process is to reduce the cost

RE: SPECIAL ANCHOR BOLT

(OP)
You mean to say stainless steel wont corrode in corrosive environment with water .

RE: SPECIAL ANCHOR BOLT

Everything corrodes. It's only a matter of how fast. Maybe you could find some removable silicone filler or something? What's your corrosion strategy for the steel column and anchor bolts in the permanent case?

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: SPECIAL ANCHOR BOLT

Just grease the cap screws. And reinsert them when the frames are not in place. As to corrosion, that would not differ much from any other anchorage in exposed conditions.

RE: SPECIAL ANCHOR BOLT

(OP)
See the steel columns would be for three months and would be removed after three months made flat and all vehicles and crane would be moving over them for 2 months , again the coulmns would be plaves there ,This occurs like a cyscle for 20 years .

RE: SPECIAL ANCHOR BOLT

Yes, I think we understood that. But would just bolt heads present a problem for the vehicle movements?

RE: SPECIAL ANCHOR BOLT

(OP)
The bolt heads and the base plate are the problem , as you know base palte is attached to the column . I was told that it should be flat groung after removing column . In the sketch i have attched water inside the coupler is the problem . I need a different solution or some idea to stop the wate inside the coupler.Please also note that there is no grout in the pile cap below the base plate.

RE: SPECIAL ANCHOR BOLT

Well, when you take the column away, the base plate is not longer a problem. Then you reinsert the cap screw. If it has to be flatter than that, perhaps a button head cap screw or even a grub screw is what you need to temporarily fill the hole.

RE: SPECIAL ANCHOR BOLT

(OP)
The problem is the water which penetrates from the bottom of base plate to the coupler when column is still there . I dont have any problem once the column and base plate are removed.

RE: SPECIAL ANCHOR BOLT

You could consider a silicone caulking around the perimeter of the baseplate once it's installed.

RE: SPECIAL ANCHOR BOLT

(OP)
Ok is it durable enough for frozen weather with salty environment .

RE: SPECIAL ANCHOR BOLT

(OP)
Also is it easily removable

RE: SPECIAL ANCHOR BOLT

(OP)
Also let me know weather it was used in any oil and gas project

RE: SPECIAL ANCHOR BOLT

1. Yes it is durable enough, just be sure to use a silicon based caulk that is rated for exterior use and not latex. Also make sure that the concrete and baseplate are dry and that there is no ice/moisture on them when applying the caulk.

2. As for removal, you shouldn't have an issue. They make caulk remover tools that you can pick up in any hardware store.

3. I don't see why this would be a concern, unless the oil and gas industries have something against the use of silicone.

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