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On Sun, 08 Jun 2008 14:27:26 -0700, Darren New <dne### [at] san rrcom>
wrote:
>And what everyone so far has missed is that roads get repaved. The
>manhole screws into the vault at the bottom
Not in the UK they don't. They are kept in position by gravity. They
lift in and out vertically.
--
Regards
Stephen
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Stephen wrote:
> Not in the UK they don't. They are kept in position by gravity. They
> lift in and out vertically.
Wow. How do they keep them level with the road, then? How do they even
make them level with the road in the first place?
--
Darren New / San Diego, CA, USA (PST)
Helpful housekeeping hints:
Check your feather pillows for holes
before putting them in the washing machine.
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"Darren New" <dne### [at] sanrrcom> wrote
> Warp wrote:
> > You left out the fact that a round cover will not fall into the
manhole
> > no matter how you might screw up opening it.
> And what everyone so far has missed is that roads get repaved. The
> manhole screws into the vault at the bottom (so you can make it flush
> with the surface of the road) and has threads on the outside. When you
> repave the road, the first thing you do is give all the manholes an
> extra crank or two to lift them up an inch or so, so they stay flush
> with the surface of the road after you add more asphalt.
Another incidental benefit, but not the ultimate reason. Manholes have
always been predominantly round, even in cobblestone streets, which are not
designed for repaving higher, and where round bezels are actually often a
*liability* (See
http://images.google.ca/images?hl=en&q=cobblestone%20manhole ). Plus not all
manhole bezels are threaded in.
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Hinged...
http://www.ngs.noaa.gov/PUBS_LIB/GeodeticBMs/images/figure05.jpg
Decorated...
http://barista.media2.org/wp-content/manhole%20japan.jpg
http://www.pinktentacle.com/2007/10/japanese-manhole-covers/
Square...
http://www.tilingandpoolprojects.co.uk/images/manHoleLarge.jpg
http://www.forgotten-ny.com/STREET%20SCENES/manholes/CT&ESC.jpg
http://www.soe.uoguelph.ca/webfiles/wjames/illustrations/AestheticInfrastructure/MHcoverSquareSanitaryPafosCyprus.JPG
http://farm2.static.flickr.com/1320/1431363588_d3de12ea72.jpg?v=0
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somebody wrote:
> Another incidental benefit, but not the ultimate reason. Manholes have
> always been predominantly round, even in cobblestone streets, which are not
> designed for repaving higher,
Well, sure. Are manholes older or newer than paved streets, tho? Once
you have paved streets and decide you need manholes to be round for
them, one might decide that one might as well use manholes on paved
streets, as well?
> http://images.google.ca/images?hl=en&q=cobblestone%20manhole ).
Funny enough, the first image at that link shows a square manhole for
me. :-)
--
Darren New / San Diego, CA, USA (PST)
Helpful housekeeping hints:
Check your feather pillows for holes
before putting them in the washing machine.
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And lo on Sun, 08 Jun 2008 23:01:45 +0100, Darren New <dne### [at] sanrrcom>
did spake, saying:
> Stephen wrote:
>> Not in the UK they don't. They are kept in position by gravity. They
>> lift in and out vertically.
>
> Wow. How do they keep them level with the road, then? How do they even
> make them level with the road in the first place?
If you're talking about what I think you are then there are adjustment
bricks that can be altered to raise or lower the level, but on a new road
(or a stripped one) the level of the road surface is dictated by the
ironworks. If an alteration is done then a square is cut around the cover,
the work is done and that section of road is resurfaced to the level of
the ironwork. Oh sure there are rules about the degree of difference
between new and existing surfaces - heh, but this is why we have the lumpy
bumpy roads we know and love :-P
--
Phil Cook
--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com
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On Mon, 09 Jun 2008 09:38:12 +0100, "Phil Cook"
<phi### [at] nospamrocainfreeservecouk> wrote:
>If you're talking about what I think you are
...
Thanks Phil, you said it just as well as I could or better :)
--
Regards
Stephen
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And lo on Mon, 09 Jun 2008 09:50:37 +0100, Stephen <mcavoysAT@aolDOTcom>
did spake, saying:
> On Mon, 09 Jun 2008 09:38:12 +0100, "Phil Cook"
> <phi### [at] nospamrocainfreeservecouk> wrote:
>
>> If you're talking about what I think you are
> ...
>
> Thanks Phil, you said it just as well as I could or better :)
My pleasure. Not that I, you know, take any real interest in road surfaces
:-P
--
Phil Cook
--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com
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On Mon, 09 Jun 2008 09:58:55 +0100, "Phil Cook"
<phi### [at] nospamrocainfreeservecouk> wrote:
>
>My pleasure. Not that I, you know, take any real interest in road surfaces
>:-P
I understand and it has been many years since I inspected gutters
close up :)
--
Regards
Stephen
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Warp wrote:
> John VanSickle <evi### [at] hotmailcom> wrote:
>> A manhole is *circular* minimize the amount of extra material needed to
>> make it impossible for the cover to fall into the manhole.
>
> Are you sure it's a question of minimizing material and not simply because
> it's the *simplest* possible solution for the problem (ie. avoid the cover
> to ever fall into the manhole)?
It is the simplest solution, but if another solution used less material,
economics would drive one of those solutions.
Regards,
John
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