Manhole depth v diameter
 

I've to connect a 110mm soil pipe to an existing 4" clay sewer pipe. It
will be near enough at a right angle.

Depth will be about 750mm-900mm.


To make it roddable I will need an inspection chamber.
There is obviously a relationship between the diameter of inspection chamber
and depth to permit the use of rods.
I'm keen to install the smallest I can get away with as they are not cheap
things.
Advice please.


mark

Manhole depth v diameter
 

"mark" wrote in message
et...

I've to connect a 110mm soil pipe to an existing 4" clay sewer pipe. It
will be near enough at a right angle.

Depth will be about 750mm-900mm.


To make it roddable I will need an inspection chamber.
There is obviously a relationship between the diameter of inspection
chamber
and depth to permit the use of rods.
I'm keen to install the smallest I can get away with as they are not cheap
things.
Advice please.

mark


It's easier to dig down and build a brickwork chamber with a lid. Make the
chamber suit the lid you buy. A good lid is 3 foot X 2 Foot for a rodding
access chamber, making the longest face toward the direction of rod pull.

The chamber depth will be determined by the depth of the drain you are
connecting up with, and a couple of inches below for the chamber sole plate.

Manhole depth v diameter
 

BigWallop wrote:
"mark" wrote in message
et...
I've to connect a 110mm soil pipe to an existing 4" clay sewer pipe. It
will be near enough at a right angle.

Depth will be about 750mm-900mm.


To make it roddable I will need an inspection chamber.
There is obviously a relationship between the diameter of inspection
chamber
and depth to permit the use of rods.
I'm keen to install the smallest I can get away with as they are not cheap
things.
Advice please.

mark


It's easier to dig down and build a brickwork chamber with a lid. Make the
chamber suit the lid you buy. A good lid is 3 foot X 2 Foot for a rodding
access chamber, making the longest face toward the direction of rod pull.

The chamber depth will be determined by the depth of the drain you are
connecting up with, and a couple of inches below for the chamber sole plate.



I have one of these going spa

http://www.wickes.co.uk/Manhole-Covers/5t-Steel-Manhole-Cover/invt/240730

In very good condition. Hardly used! (Decided to lay patio over the
drain a few months after having fitted it, so replaced with one that
takes the blocks.)

Wycombe area.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

Manhole depth v diameter
 

"BigWallop" wrote in message
om...

"mark" wrote in message
et...

I've to connect a 110mm soil pipe to an existing 4" clay sewer
pipe. It
will be near enough at a right angle.

Depth will be about 750mm-900mm.


To make it roddable I will need an inspection chamber.
There is obviously a relationship between the diameter of
inspection
chamber
and depth to permit the use of rods.
I'm keen to install the smallest I can get away with as they are
not cheap
things.
Advice please.

mark


It's easier to dig down and build a brickwork chamber with a lid.
Make the
chamber suit the lid you buy. A good lid is 3 foot X 2 Foot for a
rodding
access chamber, making the longest face toward the direction of rod
pull.

The chamber depth will be determined by the depth of the drain you
are
connecting up with, and a couple of inches below for the chamber
sole plate.




Also, if you are forming a brick built manhole, if you are careful you
can slit the existing pipe with an angle grinder to form the channel,
casting concrete under it as the base, and running your new pipe in
using a 'slipper' fitting which is haunched in with the base. Been
there and done that !

AWEM

Manhole depth v diameter
 

In message , mark
writes

I've to connect a 110mm soil pipe to an existing 4" clay sewer pipe. It
will be near enough at a right angle.

Depth will be about 750mm-900mm.


To make it roddable I will need an inspection chamber.
There is obviously a relationship between the diameter of inspection chamber
and depth to permit the use of rods.
I'm keen to install the smallest I can get away with as they are not cheap
things.
Advice please.

Umm... My sister had a house built where the existing sewer (private)
was rather deep. There does not appear to be an inspection pit at the T
junction but there is a *rodding eye* fitted. This rises at about 30deg.
and is finished with a screw down plastic cover.

These were the builders who did not bother to connect her bathroom basin
waste to the sewer but left it running into the foundation trench:-(

Huge may be along shortly to frighten me!

regards


mark






--
Tim Lamb

Manhole depth v diameter
 

Tim Lamb coughed up some electrons that declared:

In message , mark
writes

I've to connect a 110mm soil pipe to an existing 4" clay sewer pipe. It
will be near enough at a right angle.

Depth will be about 750mm-900mm.


To make it roddable I will need an inspection chamber.
There is obviously a relationship between the diameter of inspection
chamber and depth to permit the use of rods.
I'm keen to install the smallest I can get away with as they are not cheap
things.
Advice please.

Umm... My sister had a house built where the existing sewer (private)
was rather deep. There does not appear to be an inspection pit at the T
junction but there is a *rodding eye* fitted. This rises at about 30deg.
and is finished with a screw down plastic cover.

Interestingly, I have a 6" private sewer running down the Bungalow's garden,
serving about 5 houses up the road. Goes into the public sewer into the
road.

I have a pit up top and pit down bottom end, and a pit on my own bit of 4".
I spent a good half day however, digging around trying to find the pit
where they join. I uncovered a "patio" under the grass (lots of slabs),
moved all that, dug around more, but without going 4' down I'm presuming
there's just a buried junction.

Weird...

Manhole depth v diameter
 

On Sun, 16 Nov 2008 13:30:14 GMT BigWallop wrote :
It's easier to dig down and build a brickwork chamber with a
lid. Make the chamber suit the lid you buy. A good lid is 3
foot X 2 Foot for a rodding access chamber, making the longest
face toward the direction of rod pull.

For the depth quoted by the OP (750-900mm), 600x450/24x18 would
be more usual. But yes, get the cover and frame first and build
the chamber to suit.

--
Tony Bryer, 'Software to build on' from Greentram
www.superbeam.co.uk www.superbeam.com www.greentram.com

Manhole depth v diameter
 

"Tim S" wrote in message
...
Tim Lamb coughed up some electrons that declared:

In message , mark
writes

I've to connect a 110mm soil pipe to an existing 4" clay sewer pipe. It
will be near enough at a right angle.

Depth will be about 750mm-900mm.


To make it roddable I will need an inspection chamber.
There is obviously a relationship between the diameter of inspection
chamber and depth to permit the use of rods.
I'm keen to install the smallest I can get away with as they are not
cheap
things.
Advice please.

Umm... My sister had a house built where the existing sewer (private)
was rather deep. There does not appear to be an inspection pit at the T
junction but there is a *rodding eye* fitted. This rises at about 30deg.
and is finished with a screw down plastic cover.

Interestingly, I have a 6" private sewer running down the Bungalow's
garden,
serving about 5 houses up the road. Goes into the public sewer into the
road.

I have a pit up top and pit down bottom end, and a pit on my own bit of
4".
I spent a good half day however, digging around trying to find the pit
where they join. I uncovered a "patio" under the grass (lots of slabs),
moved all that, dug around more, but without going 4' down I'm presuming
there's just a buried junction.

Weird...


Could they be running in parallel passed your property? They would meet
again at the downstream pit, if they do.

Just a thought.