SPECIAL ANCHOR BOLT 1

[allimuthug]

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/getfil...a-97e1-4f04-8c33-f9557b724585&file=CASE-A.png

http://files.engineering.com/getfil...c-31ab-450e-a758-648ab59ca012&file=CASE-B.png

 

[allimuthug]

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

 

[allimuthug]

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

 

[KootK]

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.

 

[hokie66]

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.

 

[allimuthug]

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 .

 

[hokie66]

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

 

[allimuthug]

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.

 

[hokie66]

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.

 

[allimuthug]

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.

 

[PittEng88]

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

 

[allimuthug]

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

 

[allimuthug]

Also is it easily removable

 

[allimuthug]

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

 

[PittEng88]

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.