Directional Drill and/or Boring for Underground Power Cables Basics

[nonsinusoidal]

I am working on developing a directional boring standard for burying power underground cables. I have been doing research on the basics of directional Boring for power underground cables. However,I have not been able to find a good source to guide me on how to completely understand the following:

1. How to determine the minimum set back distance where the drilling machine should be located from the entry point in order to achieve the final depth where the underground cables need to be at?

2. Cables can not exceed the minimum bending radius which are given by the manufacture's specifications. As a result of this limiting factor, how do the drill rods are guided and what path do they take when directed to bore a hole for pulling back the underground cables.

3. Is there a minimum slope which drill rods can be guided to reach a certain depth or how is this accomplished?

4. Is there a mathematical analysis which can be utilize to determine the path (bored path) which the drill rods be taken when being driven into the ground?


I would really appreciate if any of you may be able to help me with the above mentioned questions. Thank you

 

[bimr]

You should talk to one of the equipment suppliers:

http://www.ditchwitch.com/

or magazines:

http://www.trenchlessonline.com/

 

[dicksewerrat]

Vermeer is another good place to get info.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[BaronENG]

From my experience, non-vertical borings can be a bear at long lengths. Gravity wants to pull the bit down and the hole may deviate. Holes may also become unstable with fall-in material.

My experience has been with core-sampling though at lengths of ~300'. At those distances, it's hard to say if your bit hasn't deviated significantly, especially in non-vertical oriented holes.

 

[dicksewerrat]

Also go to the Trenchless online site. Attend some equipment and trenchless seminars. Talk to NASST chapter in your area. NASSCO is another orginization to check out.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com