Well, they’re in and it feels good, but there were some moments of real concern. Had I chosen the right posts; were they strong enough for ramming; did it matter that they couldn’t be pointed? In the end, all it took was a good operator with good experience and rain; lots of it.
The 8’x5″ end posts are all pre-drilled and provided the biggest challenge. With the delays meaning installation didn’t begin until after Christmas, drying soils and some rocky patches slowed things up. The 100mm augur bit should have been ample but the difficulties of accurately drilling at a 30 degree angle resulted in a change to vertical posts. While possibly not as strong in design, the upside is that the posts are now 900mm in the ground which we considered plenty strong enough when combined with the 40″ ground anchors. On the other hand, trying to bang them in so far resulted in a worrying attrition rate and unacceptably high costs.
In fact, so great were the concerns, that I put a stop to proceedings until I could think of some way, (or someone,) to do it better. I was resigned at this point to having to pre-drill every hole, even for the 3 1/2″ line posts, with frightening cost implications. Eventually, pouring out my woes to a mate in the south eventuated in him making a call to someone who knew someone who was away at the moment but might be able to help when he gets back …etc…etc. It turned out that he could and, after many more delays, he did. Not only that but, after so much rain fell in April that I was worried about getting onto the site at all, by May 17th, all 620 line posts were in with no pre-drilling and with the loss of only one; a pretty incredible outcome. Love your work Ian Brown.