GX Date

On 11 Jul 2005 13:05:34 -0700, "naked_draughtsman"
<newsaddress@the-pev.co.uk> wrote:

>
>
>Guy Gorton wrote:
>
>> But the big question is when will the safety people declare the
>> remaining structure to be safe - if they ever do. If they do, will a
>> relaying team believe them? Ditto Chiltern drivers and passengers,
>> not to mention a few freight drivers.
>
>The tunnel is being constructed to take 4 tracks so there would be
>plenty of space to the side to install some temporary supports if
>necessary to reassure users (or hold up the rest of the tunnel!)
>
>pete
Two problems with that idea, I think. The first is that the track is
hard up against the southern side of the tunnel at the station
(western) end before veering gently into the middle of the space.
That is the result of the present two tracks through the station being
what were the down through and platform lines.
The second is the problem of how to attach such supports to the inside
of the curved segments without compromising the strength of the
segments by drilling holes and so on. Perhaps steel verticals with
horizontal ties at the top?
And what happens when the 4-track space is needed for 4 tracks?

Guy Gorton

In article <huq6d15qf7d54h1653qm9pfd1t27n8c3gv@>, Guy Gorton
<drossguy.gorton@stoppervirgin.net> wrote:

> And what happens when the 4-track space is needed for 4 tracks?

Looking at the photo of the inside of the tunnel (not yours, and I
can't find it now) the 4-track space looks as though it has been
encroached on by concrete(?) haunchings built at the bottom of the
tunnel walls. Any comment on that?

Sam

In article <120720050857564792%Sam.Wilson@ed.ac.uk>, Sam Wilson
<Sam.Wilson@ed.ac.uk> wrote:

> In article <huq6d15qf7d54h1653qm9pfd1t27n8c3gv@>, Guy Gorton
> <drossguy.gorton@stoppervirgin.net> wrote:
>
> > And what happens when the 4-track space is needed for 4 tracks?
>
> Looking at the photo of the inside of the tunnel (not yours, and I
> can't find it now) the 4-track space looks as though it has been
> encroached on by concrete(?) haunchings built at the bottom of the
> tunnel walls. Any comment on that?

I've now found the references to the photo - it's in
<news:WZSdnWXvzLpmq1TfRVnysA@pipex.net>.

Sam

On Tue, 12 Jul 2005 08:57:56 +0100, Sam Wilson <Sam.Wilson@ed.ac.uk>
wrote:

>In article <huq6d15qf7d54h1653qm9pfd1t27n8c3gv@>, Guy Gorton
><drossguy.gorton@stoppervirgin.net> wrote:
>
>> And what happens when the 4-track space is needed for 4 tracks?
>
>Looking at the photo of the inside of the tunnel (not yours, and I
>can't find it now) the 4-track space looks as though it has been
>encroached on by concrete(?) haunchings built at the bottom of the
>tunnel walls. Any comment on that?
>
>Sam

There is a contractor' route through the tunnel on the north side. A
concrete segmented wall separates contractors from railway Perhaps
that is what you have seen.

Guy Gorton