ksolem wrote:The appropriate removal technique depends mostly on the type of bolt used. The kind of rock and quality of placement matter also, but in order to know what tools will do a clean job you have to know what kind of bolts were used.
Some can be disassembled and removed easily, some can be pried out with a "tuning fork" type tool, some are nearly impossible to pull without scarring up the rock badly. In my experience a material called "instacrete" works well for patching the old holes, or mix some local crushed rock into epoxy putty.
My tuning fork for 1/4 & 5/16 inch bolts:
Got a close up picture?
Seems pretty lame setting uneeded fixed anchors in a wilderness canyon. PM me if you can id or photograph the bolts.
Here is a photo of one set of bolts. Note the two different types:
http://www.rickkent.net/ViewerPlus/viewphoto.aspx?ID=91606
There is no way to link a medium-size photo, as the medium-size jpegs on Rick's site are transient images, so I have to just link the page. Click on the photo to see the original size which is much larger.
Obviously, more of the bolt becomes apparent once the hanger is removed, but the above is the best photo he's got of those. The hangers weren't removed until a year later, when I joined him for that same canyon, and we started our bolt-removal "mission" there. We presumably had to spend some work and time creating the usual cairn anchor to use, before thinking about bothering to remove the existing bolt anchor.
Ironically, with that hard metamorphic rock, it likely takes more time and work to drill a good bolt hole than it does to gather some large boulders into a pile. Usually some rocks are available. They're often a LOT of work to get into place, but they're available, unlike
some of those rappels in Utah slot canyons.
Here are a couple of my photos from the same canyon:
Even after removing the hanger, a bolt is still mostly hidden in the rock, so you can't see it all in a photo, but we couldn't see any more in person either. My close-up shows the most you're going to see. I would have taken close-ups of the other bolts if I knew I would need the shots for this purpose. At least I got SOME photos.
By the way, bolts are not the only metal that has found its way into this particular canyon:
http://www.rickkent.net/ViewerPlus/viewphoto.aspx?ID=91659
Who's up for removing this thing?