Tree World - View Single Post - Tree-to-Ground Guying

quercus · 24th February 2008, 11:25 PM

It seems like the only plausible idea. Concrete block pouring is not that difficult and I have done it before succesfully. The only thing that can be seen above the ground is the eye of the lag bolt, wich can be cut of when it is not longer needed. If accessible by crane the block can also be removed in one piece when the tree is gone. Also a block of 15 metric tonnes is not that big when it comes to concrete. I have poured blocks of 30 tonnes each.

What you do is you measure the volume and dig the hole. Then you punch in steel rebar of 1 meter long and 1 cm thick on various heights and on each side in the sides of the hole. Punch them in the sides with a hammer about 50 cm deep. So the other 50 cm can be locked in the concrete. Have a large lag bolt cut to length and put a stick in the eye and lay it on both sides on the ground on a brick. So the lag bolt is now suspended on the stick and will come about 20 cm above the ground. Be sure to dig at least 30 cm deeper then the volume you calculated. The blocks have to be at least square like a cube. Or even better is that they are deeper then what they measure on the surface.
Both blocks may not be more then 45 degrees sideways to the axis line of the tree target. Now pour concrete into it with a large mixer. When it hardens put the ground back on the top of the block. You now have a serious anchoring point. The more distance the more shallow is the angle of the cables to the tree. This is way stronger then a steep angle, and lets you dig in an area where there are no major roots. Anchor the cables as high as possible in the tree. I'd suggest at least 10 tonne MBS pre tensioned dynamic cobra bracing for this.... But still, we need a lot more pics.

Another possibility is that you have a steel cable with 2 loops spliced in the lag bolts and put the lag bolt completely vertical in the concrete block so that only the eye sticks out. The steel cable loop then comes above the ground as an anchor point. This is even stronger then what I mentioned before.

When completed this tech shouldn't cost more then 4000 usd.

24th February 2008, 11:25 PM	#12 (permalink)
quercus Mature tree Join Date: Nov 2007 Location: belgium Posts: 424	Re: Tree-to-Ground Guying It seems like the only plausible idea. Concrete block pouring is not that difficult and I have done it before succesfully. The only thing that can be seen above the ground is the eye of the lag bolt, wich can be cut of when it is not longer needed. If accessible by crane the block can also be removed in one piece when the tree is gone. Also a block of 15 metric tonnes is not that big when it comes to concrete. I have poured blocks of 30 tonnes each. What you do is you measure the volume and dig the hole. Then you punch in steel rebar of 1 meter long and 1 cm thick on various heights and on each side in the sides of the hole. Punch them in the sides with a hammer about 50 cm deep. So the other 50 cm can be locked in the concrete. Have a large lag bolt cut to length and put a stick in the eye and lay it on both sides on the ground on a brick. So the lag bolt is now suspended on the stick and will come about 20 cm above the ground. Be sure to dig at least 30 cm deeper then the volume you calculated. The blocks have to be at least square like a cube. Or even better is that they are deeper then what they measure on the surface. Both blocks may not be more then 45 degrees sideways to the axis line of the tree target. Now pour concrete into it with a large mixer. When it hardens put the ground back on the top of the block. You now have a serious anchoring point. The more distance the more shallow is the angle of the cables to the tree. This is way stronger then a steep angle, and lets you dig in an area where there are no major roots. Anchor the cables as high as possible in the tree. I'd suggest at least 10 tonne MBS pre tensioned dynamic cobra bracing for this.... But still, we need a lot more pics. Another possibility is that you have a steel cable with 2 loops spliced in the lag bolts and put the lag bolt completely vertical in the concrete block so that only the eye sticks out. The steel cable loop then comes above the ground as an anchor point. This is even stronger then what I mentioned before. When completed this tech shouldn't cost more then 4000 usd.