rock excavation

[72shortbox]

Does anyone have any expirience using one of these expanding liquid mixtures such as
The Cracker from u.S. Anchor Corp. or
Bristar from Demolition Technologies Inc.

I have a pipeline project were we have encountered hard rock, but blasting is not allowed due do some old pipe adjacent to the new line.

What other methods are used other than just hoe ramming for ever.

 

[StephenA]

I have used expansive cements before. You have to expand to an open face and it takes several hours to work, so quite slow.

Depending on rock hardness, you could look at a milling machine on the end of a backhoe. There are different sizes and mill a trench with vertical sides. Also depends on the trench width required.

I can find a name if you do not know of them.

StephenA

 

[72shortbox]

I havent heard of a milling machine on a backhoe. Is that applicalbe for hard rock 6,000psi +
We looked into a large trencher which was used in the coal minds, but the mobalization is rather high.

As for the expansive cements. What brand did you uses and how close did you have to put the holes?

 

[StephenA]

This is one web site that has a rock grinder tool as I guess that you are in the US.

http://www.langtool.com/products.html#ltc_rock_grinder

Best regards

StephenA

 

[cvg]

a rock trencher can work. I have used this on a project through heavily cemented material (caliche) which was essentially rock. The mobilization may be high, but production rates might make up the difference. If the old pipe is very close to the new, I would be concerned about hitting the old pipe with either a trencher or a hoe ram.

 

[StephenA]

From memory the holes were around 600mm apart, but it will very much depend on fracture planes and rock brittleness.

I used it in South Africa and Hong Kong so brand name may not help. I think that it was a Japanese make in HK.

Presumably the old pipe will be in a blasted trench so the location should be well defined and if you are around 1 to 1,5m away, you should be OK using the rock trencher unless it is a very weak pipe.

StephenA

 

[StephenA]

This is another rock trencher web site

http://www.hydrorock.com/

Best regards

StephenA