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PostPosted: Fri Apr 28, 2006 4:18 pm 
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Joined: Fri Apr 28, 2006 4:02 pm
Posts: 1
Location: Oslo, Norway
Hi, I need to clean an old concrete wall of its original bolts and replace it with new ones. The original bolts seem to be straight iron sunk in with the holds attached with a washer and nut. They seem to be sunk about 8 - 10 years ago. The wall on which they are placed is 14m high and is exposed to the weather including ice (am not in sa guys! ;-)

I have not yet down a visual inspection of each bolt, but am already certain that 90% would need to be replaced. Is there anyone that can give me advice on chopping them and then placing new ones in the concrete. Am used to sandstone placing with expansions, but this is quite different.

Cheers


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PostPosted: Tue May 02, 2006 1:35 pm 
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Joined: Tue May 02, 2006 1:17 pm
Posts: 11
Location: Pretoria
Chopping bolts from a concrete wall can be quite easy, you'll need a cold steel chisel and a hammer.
After the object has been removed from the bolt, leaving the bolt exposed, knock a couple of grooves in the bolt, at the point where it meet the wall, with the hammer and chisel. Then take a big swing at the bolt with the hammer and it should come off quite easily flush with the wall. It might chip the concrete a bit if it is an old wall but that can be reparied with filler.

As for new bolts, there is quite a range of good anchor systems availible to do the job in concrete. Expansion bolts can work well if they are designed for the purpose in mind. Best is get a catalog of anchors from your local supplier or ask them to recommend a product. Stainless steel will last the longest outdoors but watch out for mixing metal types to avoid galvanic corrosion.


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PostPosted: Tue May 02, 2006 3:50 pm 
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Joined: Tue Jan 17, 2006 6:09 am
Posts: 434
I just bought a battery powered grinder... ideal for chopping bolts. Scary stuff!


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PostPosted: Wed May 03, 2006 5:15 pm 
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Joined: Tue May 02, 2006 1:17 pm
Posts: 11
Location: Pretoria
Hey Derek, you gonna climb some ice this year?


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PostPosted: Wed May 03, 2006 6:50 pm 
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Joined: Tue Jan 17, 2006 6:09 am
Posts: 434
Hmmm...ice...that's that cold stuff. I'm feeling a bit wimpish. But I am keen. Keep me posted Lofty. Any plans yet? I think this winter is going to be a big one. A few of the mates are also keen.


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PostPosted: Thu May 04, 2006 8:04 am 
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Joined: Mon Sep 26, 2005 8:39 am
Posts: 7
Location: Durban
Check out the Berg ice RD's at http://kzn.mcsa.org.za

_________________
What would Chuck Norris do?


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PostPosted: Fri May 05, 2006 11:07 am 
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Joined: Tue May 02, 2006 1:17 pm
Posts: 11
Location: Pretoria
Got some ice plans so far:
24-25 June - Oxbow
7-11 July - Giants Castle Eastern Gully etc (JHB section meet)
29-30 July - Bokong (JHB section ice course)
9-13 August - Compassberg Winter Ascent (if there has been snow)

I'm also hoping for a better season this year after the pathetic winter we had last year.


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PostPosted: Fri May 05, 2006 4:22 pm 
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Joined: Tue Jan 17, 2006 6:09 am
Posts: 434
Will definatly be keen for Compasberg...this is the only \"real\" ice route in the EC. Well exept for the small crap we did at Tiffindale.

Do these plans fall away with no snow? Obviously...


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