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Tuesday 16th March 2010 at 9:46:40 AM
Rank: Belay Test Passer
#Posts: 1
#Points: 1
Wednesday 17th March 2010 at 11:36:24 AM
Rank: Cut-loose Expert
#Posts: 280
#Points: 280
i'm assuming you're planning on top-roping (TR). in that case, you'll want to find a couple of solidly anchors struts/support beams (maybe some components of the guard rail). the problem with anchor-building around man-made structures like a bridge are the potentially sharp metal edges to which you'll be attaching your soft goods. to protect your webbing/rope/cordage that you might use, try a piece of carpet or something between the rail/post/beam and your anchor. beyond considerations like that, it's just like setting up any other TR rig. just make sure you have at least 2 solid anchor points and then equalize the rig at the master point. i've written a bit about USSR (ultimate slingshot rig) for TR anchor in another post (should pop up in a search). you could look that up, or just use webbing (cord would work, but i wouldn't necessarily suggest it unless you knew you didn't have to worry abut it getting cut). either way be careful about the aforementioned edges to make sure your anchor doesn't get sawed.
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if you're referring to leading i would strongly advise against trad, because the integrity of cement and even rock mortared in place is not good for protection. i've seen bolts work before on bridges, but rap-bolting is the way to go for that (just for safety again).
-
hope that helps a bit.
Wednesday 17th March 2010 at 12:06:21 PM
Rank: Cut-loose Expert
#Posts: 280
#Points: 280
i'm assuming you're planning on top-roping (TR). in that case, you'll want to find a couple of solidly anchors struts/support beams (maybe some components of the guard rail). the problem with anchor-building around man-made structures like a bridge are the potentially sharp metal edges to which you'll be attaching your soft goods. to protect your webbing/rope/cordage that you might use, try a piece of carpet or something between the rail/post/beam and your anchor. beyond considerations like that, it's just like setting up any other TR rig. just make sure you have at least 2 solid anchor points and then equalize the rig at the master point. i've written a bit about USSR (ultimate slingshot rig) for TR anchor in another post (should pop up in a search). you could look that up, or just use webbing (cord would work, but i wouldn't necessarily suggest it unless you knew you didn't have to worry abut it getting cut). either way be careful about the aforementioned edges to make sure your anchor doesn't get sawed.
-
if you're referring to leading i would strongly advise against trad, because the integrity of cement and even rock mortared in place is not good for protection. i've seen bolts work before on bridges, but rap-bolting is the way to go for that (just for safety again).
-
hope that helps a bit.