Difference between Lowering and Boring Pipe Segment

[elaineabc]

I am still confused between terminology when contractors are referring to lower, bore, directional drill of a pipe segment. I hope I could be lucky enough to have someone explain to me in details. Thank you very much.

 

[bimr]

Try this paper:

http://www.microtunneling.com/education/Papers/tt0696_1.htm

 

[Ashereng]

Yes, the paper is correct. There is no "definitive" definition.

I think of it this way.

A HDD or Horizontal Directional Drilling is typical of large diameter pipes and long runs. The drill head is controllable. It can go anywhere - up, down, left, right, forward, backwards. The drill is continuous. The drill head goes forward, and stuff goes backwards. I am currently involved in a 1.5 km HDD (that's almost a mile). I have heard of HDD over 3 km.

A bore, I tend to think of as more like an auger. You stick it in the ground, then pull it back out to get the material out. Stick it back in and do it again. I tend to think of bores are being for shorter distances, like maybe 100 m (about 100 yards).

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

 

[LHA]

I agree with Ashereng...and I'll take the obvious one...

I've never heard the term 'to "lower"', but I think they must be referring to what I've always thought of as "trenching" or 'to "opened cut"': excavate, insert bedding, pipe and backfill.

Engineering is the practice of the art of science - Steve

 

[zdas04]

lha,
That is right. You "lower" an assembled segment of pipe into a trench or open cut and you "feed" an assembled segment into a bore or HDD.

David