Cricket and tunnels.

[neasdena60]

I quite like this idea from the MCC and Lords..

" Most of the tunnels rumoured to snake through London's foundations are urban myths, but not in the case of Lord's. There are two disused train tunnels under the Nursery Ground, and they could be converted into indoor nets."


www.telegraph.co.uk/sport/cricket/2295014/Tunnel-vision-for-Lords.html


www.timesonline.co.uk/tol/sport/cricket/article3716497.ece

[Ben]

The first artical says they were for the Met and Jubilee. Surely thats not right is it? What were they for then.

[Dstock7080]

May 11, 2009 15:23:14 GMT Ben said:

The first artical says they were for the Met and Jubilee. Surely thats not right is it? What were they for then.

The second article may give the answer:
^{"The tunnel, which was part of the Marylebone to Aylesbury train line, was constructed in 1897 and bears testimony to the expertise of Victorian architects and builders. This runs 200 metres from beneath Wellington Hospital to St John's Wood Road and extends 38 metres under the Nursery Ground. The original station at Lord's was demolished in 1939."}

[wellgroomed]

May 11, 2009 16:38:33 GMT Dstock7080 said:

May 11, 2009 15:23:14 GMT Ben said:

The first artical says they were for the Met and Jubilee. Surely thats not right is it? What were they for then.

These arn't Underground tunnels. They refer to the disused tunnels between Marylebone station and West Hampstead.

What people usually refer to as St. Johns Wood Tunnel now - actually consists of a number of overline bridges and covered ways.

From Marylebone out to West Hampstead:

(1) Lodge Road overline bridge.
(2) Danubius Hotel (covered way).
(3) St. Johns Wood Road overline bridge.
(4) Lords Tunnel
(5) Wellington Hospital (covered way).
(6) St. Johns Wood Tunnel.

"Lords Tunnel" consisted of three tunnel bores. Only one of which is still used today, which contain the two main lines and the Up Siding.

The centre bore originally carried the headshunts from the Up & Down Slow lines, with the down side bore carrying the headshunts from the original Wall Siding.

Whilst it used to be more obvious than it is today, you can still see the tunnel bores from the disused sections of Lords Tunnel. Although the obvious gap on the 'down cess' between the St. Johns Wood Road and Lords Tunnel has now been fenced off with pallisade fencing.

The 4 chain gap between Lords Tunnel and St. Johns Wood Tunnel was covered over by the Wellington Hospital in 1974.

[Chris M]

Is there a technical definition of when a bridge stops being a bridge and starts becoming a covered way?

[wellgroomed]

May 11, 2009 18:26:00 GMT Chris M said:

Is there a technical definition of when a bridge stops being a bridge and starts becoming a covered way?

I've never found one! If there ever was one, I think it's been lost in the mists of time.

Personally, I believe that anything that has been bored is a tunnel. With anything that has been covered over, after having been open during it's life, to be a covered way.

However, I think simply the official designation mixes depending on who's responsible for civil structures at the time.

For example, the covered way at Gerrards Cross - is officially "Gerrards Cross Tunnel".

The locking sketch for Three Spires (Coventry), shows the overline bridge for Phoenix Way as "Bedlam Lane Tunnel", but that name then doesn't appear anywhere else that I can see.

Then you have similar issues, which is not picked up on so much as the tunnel/covered way debate; with whether a viaduct is actually a viaduct or an underline bridge.

Luckily (?!), the civil engineers on the Underground have made life a lot easier for everyone by prefixing everything with things like [RW] and [W]!

[Deleted]

I believe that anything that has been bored is a tunnel

Really? I must be a tunnel.... ;D

[stanmorek]

May 11, 2009 19:02:03 GMT @wellgroomed said:

Personally, I believe that anything that has been bored is a tunnel. With anything that has been covered over, after having been open during it's life, to be a covered way.

I would generally agree with this statement.

The classification of structures on LU appears quite arbitrary. Covered ways on LU are structurally speaking no different to a bridge*. The LU definition for a covered way is "a structure spanning over the system whose length is twice its span" though I don’t where this might originate. I believe NR’s definition for a covered way differs.

The brick arch structures spanning over the sub-surface railway are referred to as tunnels by LU though the majority of these were constructed using the same cut and cover methods as covered ways with temporary centring timbers to form the arch rings. The logic in the classification is that the structural behaviour of arches is quite different to covered way structures and has more in common with the deep level tube tunnels. It is not uncommon for covered ways to however have jack arches as decking. A bored tunnel was constructed under Clerkenwell though internally it appears no different to the other brick tunnels on the SSR. Incidentally, Gerard’s Cross Tunnel is structurally an arch and the failure to understand its behaviour led to the partial collapse of the first attempt.

Confusingly, LU retaining wall assets have the same W- prefix as parapet walls. Gabion basket type retaining structures use the RW- prefix.

* Just something I wanted to clarify Railway engineers would describe a bridge supporting the line as an underline- or underbridge and a bridge over the line as an overbridge. Simple. However, the definitions are reversed for Highway engineers.