"Jim Langston" <tazmaster@[EMAIL PROTECTED]
> wrote in message
news:fnUYj.13$bx6.2@[EMAIL PROTECTED]
> Larry Hewitt wrote:
>> "Jim Langston" <tazmaster@[EMAIL PROTECTED]
> wrote in message
>> news:4PfYj.7$N06.5@[EMAIL PROTECTED]
>>> Jerry Beeler wrote:
>>>> A cylindrical pipe has a radius of 100 inches and a length of 30
>>>> feet. The pipe was run under a road, but, due to an error it had to
be
>>>> removed and dropped 18 inches below it's original position.
>>>>
>>>> What is the volume of the void that is left from the original
>>>> position?
>>>> Note: This void has to be filled with $200/square yard material so
>>>> I have to be accurate.
>>>>
>>>> Thanks!
>>>
>>> Are you sure you need to fill up the volume at all? It sounds to me
>>> like you are thinking that once you dig out the pipe and put a new
>>> one lower down you will have a void where the old pipe was. But
>>> consider, you are going to have to remove as much material where you
>>> put the pipe lower down. You are going to have to remove the dirt
>>> where you are going to place the pipe lower down and put it...
>>> somewhere. So actually when you are done moving the pipe down you
>>> won't have any void.
>>
>> Fill removed from the trenching would not be able to be compacted
>> enough to sup****t a road. The void will need to be filled with a
>> grout, cement, or similar material that can flow to fill all cavities.
>
> Well, then your problem is compounded, isn't it? Because you are going
to
> have to dig down to the pipe to remove it, and aren't going to be able
to
> reuse the fill over it, right? So you will need to fill with material
all
> the way down to the bottom of the pipe. Or are you somehow going to be
> able to reuse the material?
>
I don;t think you are picturing the situation accurately.
Assuming, for simplicity, that they are using a 100 in boring machine,
then
after removing the pipe they will bore 18 inches deeper for the new pipe.
The new pipe will lay snuggly in the new trench. In reality, a small
amount
of sand of small gravel will line the bed, but it will be a very small
amunt
if the soil is stable.
This will leave a "quarter moon" shaped void above the pipe 18 in tall at
the center (trace a quarter, moveit down 3/16 in, then trace it again.)
The fill problem is acute at the "tails" f the void where the two
cir***ferences intersect.
I work for a municipal utilityand this is not an unheard of situation ( it
is fake, 100 in diam pipeswould not be bored under a road). Our cad
software
actually has a utility for figuring this out.
Larry
>
>>> --
>>> Jim Langston
>>> tazmaster@[EMAIL PROTECTED]
>
>
>
> --
> Jim Langston
> tazmaster@[EMAIL PROTECTED]
>
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