On 25/04/2011 Marto wrote:
>My mate Tim rapped down and using an extendable draw and his own body
>weight gave each bolt a good outward pulling tug. The third bolt from
>the ground came out quite easily, all the others remained in place. The
>bolt had snapped from rust rather than pulling straight out. The guide
>book also mentions that it is quite run out getting to the third bolt.
> It is now an extensively longer run out to the next bolt....with a certain
>ground fall from about 15m.
Shite. A bit of a worry. Can you confirm they type of bolt ... 10mm non-stainless steel dynabolts?
Raises a couple of questions;
-What are the chances the bolt broke because it was origianlly overtightened (not just because of rust weakening it)
- Do these bolts rust quicker in sandstone than granite.
-Are similar bolts at Tarana and in the ACT really that bad.