Results 1 to 5 of 5
Thread: FYI - Lucky Charms bolts
-
10-29-2007, 11:28 PM #1
FYI - Lucky Charms bolts
We were down in the North Wash area a few weeks ago and did the Lucky Charms loop. We found someone had bolted the 200ft dry fall. We were planning to rappel the dry fall using natural anchors (and there was a large boulder which could've easily been used), but since they were there, we used them. They're on the west side at the top of the drainage. TR here:
http://picasaweb.google.com/gwest1000/LuckyCharms
-
10-29-2007 11:28 PM # ADS
-
10-30-2007, 07:59 AM #2
Re: FYI - Lucky Charms bolts
Originally Posted by gwest
-
10-31-2007, 12:21 PM #3
Yeah, probably the same ones. They still looked pretty new, so I didn't know if they had just been put in this year.
-
10-31-2007, 03:03 PM #4
Re: FYI - Lucky Charms bolts
Originally Posted by Stick
I usually shoot for no closer together than the span of my hand, between the tip of my pinky and thumb, at the widest I can make it. Leaves a bit of margin for error.
Sometimes closer makes for a more compact and less obtrusive anchor.
-Brian in SLC
-
10-31-2007, 05:56 PM #5
Re: FYI - Lucky Charms bolts
Originally Posted by Stick
To maximize strength, bolts should be 2X the length of the bolt apart. Thus assuring that the 45 degree sheer cones of the two bolts do not intersect and that the bolts can be truly termed independent.
But we don't place two bolts because we need the strength. We place two bolts because bolts are not inspectable, bolts are hard to place correctly, and therefore we wish to improve the reliability of the overall anchor via redundancy. Placing bolts too close together to compromise their reliability would involve placing them close enough that the web between the two holes is in danger of collapse or fracture. I'm thinking, bolts at least 2" apart are probably just fine in our sugary navajo sandstone.
It is, however, possible that drilling a hole "close to" another expansion bolt could compromise the original placement, due to vibration and shock waves. Seems like, again, we are talking 2-3 inches. The possibility does, however, suggest that if putting in two bolts quite close to each other, you should probably drill both holes first, THEN set the expansion bolts in the holes.
Capiche?
Tom
Similar Threads
-
Bad Bolts in Rock of Ages
By Iceaxe in forum CanyoneeringReplies: 61Last Post: 05-18-2011, 08:02 AM -
Bolts versus needless risk
By qedcook in forum CanyoneeringReplies: 104Last Post: 11-22-2008, 08:01 PM -
Bolts IN and OUT in Glen Canyon
By ratagonia in forum CanyoneeringReplies: 4Last Post: 10-07-2008, 10:40 AM -
Bolts in Baptist Draw need to be pulled
By Scott P in forum CanyoneeringReplies: 9Last Post: 05-14-2008, 06:22 AM -
Lucky Charms: Creation or Evolution
By hank moon in forum Environmental IssuesReplies: 0Last Post: 08-05-2007, 02:28 PM
Visitors found this page by searching for:
Outdoor Forum