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anjanasuresh
SEFI Member
Joined: 15 Feb 2012
Posts: 3
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 Posted: Wed May 17, 2023 9:24 am Post subject: Anchor Bolts short in length |
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Recently we encountered a site issue where anchor bolts were short in length and sufficient threads were not available for nuts.
We have gone through many articles and SEFI as well for finding the solution and one such solution which is feasible for us is to weld the extended threaded rod to the existing anchor rod. The grade of anchor bolts used in our case is Property class 4.6 confirming to IS 1367(Part 3): 2002. Experts please advise whether welding is allowed for anchor rods of grade 4.6 or please suggest any other solution which is commonly followed in such situations.
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Trilochan S.Dholakia
SEFI Member
Joined: 12 Oct 2011
Posts: 9
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| Posted: Thu May 18, 2023 7:30 am Post subject: Welding Anchor Bolts |
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1. From the photo it appears column is not placed centrally. One can see left and right stiffener plate dimensions different ! Please review. It appears not correct.
2. You may try coupler bars. Preference is Bar tech couplers .
Request to review.
Hope this finds helpful
T. S. Dholakia
Sent from my iPhone=
Posted via Email
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vikram.jeet
General Sponsor
Joined: 26 Jan 2003
Posts: 3714
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| Posted: Fri May 19, 2023 3:17 am Post subject: |
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A thick washer needs to be welded to A bolt and plate in addition to butt welding of Bolt extension,,
Washer weld must be thick enough to take Bolt uplift force,, both at plate around as well at bolt around.
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anjanasuresh
SEFI Member
Joined: 15 Feb 2012
Posts: 3
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| Posted: Fri May 19, 2023 4:03 am Post subject: Re: Welding Anchor Bolts |
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| Trilochan S.Dholakia wrote: | 1. From the photo it appears column is not placed centrally. One can see left and right stiffener plate dimensions different ! Please review. It appears not correct.
2. You may try coupler bars. Preference is Bar tech couplers .
Request to review.
Hope this finds helpful
T. S. Dholakia
Sent from my iPhone=
Posted via Email |
Dear Sir,
Thanks for the reply.
1. Photo attached is of one of the Tower leg tapering from bottom to top and hence you may find it not aligned to the center.
2. I understand, going with option of coupling nuts with extended rods requires enlarging the existing holes in the baseplate which is not possible in our case.
3. Is welding permitted for Grade 4.6 bolts? Please clarify.
Regards,
Anjana B.S
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spsvasan
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Joined: 18 Dec 2008
Posts: 376
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| Posted: Sun May 28, 2023 6:59 am Post subject: Re: Welding Anchor Bolts |
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[quote="anjanasuresh"][quote="Trilochan S.Dholakia"]1.
Thanks for the reply.
1. Photo attached is of one of the Tower leg tapering from bottom to top and hence you may find it not aligned to the center.
2. I understand, going with option of coupling nuts with extended rods requires enlarging the existing holes in the baseplate which is not possible in our case.
3. Is welding permitted for Grade 4.6 bolts? Please clarify.
The higher strength of Grade 4.6 bolts is usually obtained by heat treatment. The heat produced by welding will affect this strength gain. Hence the standard practice is to avoid welding in grade 4.6 bolts
S.P.Srinivasan
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anjanasuresh
SEFI Member
Joined: 15 Feb 2012
Posts: 3
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| Posted: Mon May 29, 2023 8:57 am Post subject: Re: Welding Anchor Bolts |
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[quote="spsvasan"][quote="anjanasuresh"] | Trilochan S.Dholakia wrote: | 1.
Thanks for the reply.
1. Photo attached is of one of the Tower leg tapering from bottom to top and hence you may find it not aligned to the center.
2. I understand, going with option of coupling nuts with extended rods requires enlarging the existing holes in the baseplate which is not possible in our case.
3. Is welding permitted for Grade 4.6 bolts? Please clarify.
The higher strength of Grade 4.6 bolts is usually obtained by heat treatment. The heat produced by welding will affect this strength gain. Hence the standard practice is to avoid welding in grade 4.6 bolts
S.P.Srinivasan |
Dear Sir,
Thanks for the reply,
Noted sir.
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