DecadentLinuxUserNumeroUno wrote, on Mon, 16 Feb 2015 19:24:43 +0000:
Right now, the two 16-foot boards to the side of the tree are unattached
at the tree (they're screwed into the floating bridge only).
At the moment, the bridge is wholly supported by the cables and, at the
low end, by the posts we first cemented into the ground, when we started
this project in the untrampled woods.
It is time for those attachment pins you speak of though...
What we are thinking is that they sell these $100 treehouse attachment
bolts, designed specifically for trees (but they're expensive since
we'd use probably use four or six of them overall).
We can't find anything larger than one-inch wide bolts at our local
Home Depot, so, we have to order our bolts online, at any measure.
We're debating right now the feasibility of 1 inch or 2 inch bolts,
which are about twenty bucks each, versus the treehouse attachment
bolts which are five times as expensive.
So, that's our next question. What kind of bolts make the most sense,
keeping cost in the equation (if cost were no object, the treehouse
bolts would do quite well).
I don't know what kind of bolt you will use, but here is my experience
with bolts in a living tree: I fastened some wooden squirrel feeders
to trees using lag bolts and washers. In a year the tree grew AROUND
the bolt, pulling it through the plank of the feeder. I learned to
put a spring between the bolt head and the washer to allow for this.
A threaded SS bar through the tree might be a better option, making it
longer than needed so you could back off the nut as the tree grows.
Of course you would want a jam nut so that it would not back off by
Are these bolts going to support the weight of the bridge? That seems a
bit awkward with the long length of the board. Does the support board
run under the bridge to be supported at the other end?
I think rather than drilling into the tree, I would make use of the
various branches and wrap a line around the tree trunk like a lasso
somewhat higher up than the walkway. The branches will keep it from
sliding down the tree without being tight. Drop the line to the walkway
or even pass it under and back up on the other side to the same or
rickman wrote, on Tue, 17 Feb 2015 20:17:21 -0500:
The bridge is already supported.
It's supported by a 3/8-inch suspension cable on both sides.
The bolts are simply for redundancy, and, because the treehouse, when
built, will add additional weight, even if/when the cable is suspended
for the treehouse itself.
We haven't decided what to do with the branches yet.
Redwood branches tend to die off and fall out from time to time.
Not all but here and there. Some are 4-6" in diameter. Consider that
but end coming down on you, your car, your shop. One punched through
my shop roof and kept out the rain with all of the green junk on top.
I had to cut it off on top and on the bottom - punch out the disk and
replace the roof boarding. Glad it was in the shop.
Martin - relocated from my 100 or so tall tree home site.
A dozen years ago we owned a lot (around 4 acres) with many large
trees. One huge oak had a horizontal limb about 2 feet in diameter
and I dreamed of putting up a spiral stair and a platform on the limb,
just for fun. We wound up selling the lot instead of building a house
on it, and I went by to look at it a last time and the limb had fallen
off and was lying on the ground.
You should get a less weak grip of the facts.
A one inch hole drilled through the center meat of a Redwood? Hardly.
The stainless bar finishes the task. The tree would have no problem
growing around the bar, and even if it did not, it would not weaken the
tree ANY significant amount.
If the tree could take a 30 ton tornado force before, now it can only
take a 29.8 ton force.
Pretty much negligible, is the point.
You'd break the gear you hang on the pins before you'd break the pins or
Oren, ever since kooties and large feet, I've learned that when you
say the huckleberries are ripe, the huckleberries are ripe.
I should have taken a picture of it, but, the dog stays mostly on
the other side of the fence, not even close to the bridge anymore.
Certainly he doesn't venture out on the bridge.
Some day, I'll snap a picture if he does though.
For you, my friend.
Interestingly, that dog is fantastically protective!
When the mountain lion came by, and we didn't know it, he was
barking and yelping like crazy and growling, which is not his
normal nature. It was only later, when one of the animals got
killed, during the storm, where the dog was locked inside,
that we had realized what he was making all that commotion about.
So, now, the dog stays outside, with the rest of the animals,
to protect them, even during the storms (which may have abated
until next winter, by now).
There's a funny thing about mountain lions.
They can easily bring down a full-sized buck, so, a puny human
"should" be easy prey. Given that they're experienced hunters, I doubt
the human would have much time to see the mountain lion that gets him.
Given that, the mountain lion should "win" against a puny human,
particularly with the claws and teeth of the mountain lion wrapped
around a puny human's head, neck, and throat.
So, given that, why aren't there far more mountain lion attacks
than statistics show?
Clearly, where I hike alone (almost daily), mountain lions abound.
We have dead deer, dead goats and sheep, and even videos of a mountain
lion dragging a buck taken by a dash cam on our winding road.
The enigma is that there aren't really a whole lot of documented
attacks on humans. Sure, humans aren't their standard fare; but
how do "they" know that?
I'm not worried, but, I do hike in these here hills almost every
day, and, I haven't yet "seen" a mountain lion (although I've seen
plenty of dead deer).
The reason is that humans ganged up on and killed critters that dared
to take a human. Over the last say 50,000 years, this enduring bit of
Darwinist pressure had a big effect. Five or six people with spears
are quite capable of killing a lion.
I've encountered mountain lions (aka cougar, puma) in both the Santa Teresa foothills
and the Marin headlands. They're sized similar to a medium sized dog
(24" to 36" at the shoulders, 65 to 180 pounds depending on gender and age).
The lions mainly hunt from dusk to dawn, which is one reason that human-lion
encounters are rare. The lions are also not interested in humans as prey.
On Fri, 20 Feb 2015 20:01:51 GMT, email@example.com (Scott Lurndal)
I encountered one in my back yard. Awakened by the dog barking very
strangely, I stuck my head out the arcadia door to encounter mountain
lion with my dog standing on top of his dog house shaking like crazy
Mountain lion took off like a bullet.
| James E.Thompson | mens |
| Analog Innovations | et |
Thanks for your well wishing.
It is one of a kind, so, we're learning as we go.
In the end, it will be pretty neat though, don't you think?
It a 10-foot wide suspension bridge, which starts at ground level
on a path in the redwoods about a thousand feet (or so) from the
nearest anything, and then goes for about 70 feet to a large
second-growth redwood, where the deck expands to 16 feet wide.
Sitting on the wide decking, about 40 feet above the ground, will
be a two story treehouse, with a bathroom, kitchen, electricity,
gas heating, and WiFi Internet (which is something we're experts
at by now, given that we all maintain our own radio antennas).
We're thinking of suspending the treehouse with 1/2 inch cable
wrapped from the big tree to the two smaller trees cradling
the bridge at about the half-way point that you see to the
right in this picture.
So, that way, the treehouse and the suspension bridge would
be, in effect, supported separately (or we might make the support
mutual and redundant). We're also thinking of adding downward
hanging support cables, again from the smaller redwoods to the
decking, to add redundancy once the treehouse weight goes up.
One problem we have been having is we have had to constantly
adjust the tilt and leveling of the bridge, as weight was added
to the end. We ended up buying a dozen cable winches, which are
what is holding the bridge up now, one of which can be seen in
the left in this photo below.
We also may erect a few more nets so that we can walk out to
the neighboring trees. In fact, if you look closely, you can
see two different nets in the picture above. One is to the
top left of the picture, and the other is in the center right,
in the big redwood tree itself, where someone spent months
sleeping in and writing a book, many years ago (his net is
still there, 40 feet up in the tree; but we would replace it
as it's not safe to use probably, being fifty years old).
Redundant would be good. Bridges without redundant support fall down,
e.g. the one in Minnesota--see e.g.
We're also thinking of adding downward
You can't wrap the cables round the trunks, or you'll kill the trees in
a few years. Nice big eye bolts are the ticket, I expect, provided you
don't put any torque on them (i.e. you have to drill the pilot hole in
the direction of the pull). The tree can easily grow around them,
unlike wraparound cables. The problem with wood fasteners is that they
aren't load rated, unlike machine bolts.
Sure beats turnbuckles.
I think George Dyson probably published construction details of his
famous tree house.
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