Drilling into rock

[Sethius]

well,
things are getting interesting and im now wondering if any of you, have drilled into rock before for trail building purposes, if so what did you use exactly?

as scoping out new track potential today and found an amazing line but would require drilling into rock to hold a bridge between the rocks. like | _ |

so has anyone done it?

[derelikt]

A generator and hammer drill. You are now cool because you are 1337.

[Chalkie]

OLIOLIOLIOOOOO the 1337 Club has just attained it's newest member!

Anyway. I'm assuming you would just need a Masonry drill bit and a cordless drill. Go have a chat to your local hardware store they should sort you out.

[Sethius]

OLIOLIOLIOOOOO the 1337 Club has just attained it's newest member!

Anyway. I'm assuming you would just need a Masonry drill bit. Go have a chat to your local hardware store they should sort you out.

cheers chalkie, if i find what im over and get it built ill post up pics! will be a nice line for something different.

[luke.b]

Yep, good quality masonary bit, and a decent cordless should be able to sort you out. Then just drop a dyna-bolt through the wood and into the hole and your off.

[rhyno]

Really does depend on the rock though, as there will be natural fault lines and also the rock may be too soft to handle the pressure of a dynabolt. It should be right, just take a good look at where your drilling first.

[Sethius]

Really does depend on the rock though, as there will be natural fault lines and also the rock may be too soft to handle the pressure of a dynabolt. It should be right, just take a good look at where your drilling first.

basically both rocks are both a few tonne, we talking huge ars boulders here with a good strong structure no shailing or anything of the sort.

[Mojo]

do you need a weight bearing solution or just something to support from horizontal movement for going over a rock???

[wokkawokkawokka]

I agree, your best bet would be using a cordless hammer drill and a masonary bit, but then use chemset to anchor your threaded rod or whatever you will be using. Go to any climbing gym and talk to the guys there on the best stuff to use (dont trust my advice!!!) as there are different chemsets for different applications.

just a suggestion, a timber slatted cable bridge between 2 rocks would certainly be a novel line...

[Reubs]

Yep, done it a few times with both dyna bolts and rawl plugs (the little green tube things) depending on how it was going to be loaded. You dont necessarily need a hammer drill (assuming it is sandstone) but the masonry bit is a must. A normal cordless will do the job if you take it slow but obviosly a hammer drill will be easier. The best way to attach timber to the dyna bolt is with a steel bracket- i made my own with some 3mm steel plate, drill a couple of holes and bend it to the shape you want, paint it to stop rust.

[Sethius]

it will be weight bearing along with the wood, tis why i like the idea of running cables if i can from top to bottom of the section just to spread it out and using larger holds top and bottom of the rock its basically a spiral down about 5m in between 2 large boulders.

cables and a solid structural setup may be the best option yet.

[rowdyflat]

It depends on the rock type where you live ---ob Mansfield.
If it is a type of granite it will be large + hard.If it is softer eg sedimentry oops spelling? rock it may split.
You can use a generator or lots of batteries , rotary/hammer drill + masonary bit.
The bolt solutions have already been discussed dynabolts or chemsets are very strong at right angles to the load.
Alternatively you may find that you can built a tight wooden structure + just jam it in place between the rocks.

[shore_2]

If you plan on building a decent sized house on it after your done using it as a jump use chemset/dyna bolts.
In the past on a vertical shear load i have used some stuff called "spagetti" i think it is known as.
Get a sharp 5.5mm masonary bit. A decent guage 4in long nail and your done.

Here's the steps:
1) Drill through both timber and stone with 5.5mm bit.
2) Feed "spagetti" (it's made by ramset it comes in a bundle) through both timber and rock.
3) Cut it to length flush with the end of the timber.
4) Put a decent guage 4in nail through it all.

You will be suprised at how well it holds. A nail has something like a 3 tonne shear strength anyway.

[bikekid127]

i hope your trail works out well

[nickmann]

jackhammer:p