Re: Track re-lay practices (was Box Hill extension)
IS Edit
Friday, April 19, 2002 4:39 AM
The track construction method in your photo looks a
lot simpler and cheaper than using concrete sleepers to me.
Why carry around sleepers that weigh at least 100kg
when you can get wet stuff carried to the rail in the back of an agitator trucks
and simply pour it around the track?
I'm missing something, here.
Bob Murphy
----- Original Message -----From: Brent EffordSent: Friday, April 19, 2002 2:24 PMSubject: [TramsDownUnder] Track re-lay practices (was Box Hill extension)"In addition to being quieter, asphalt (bitumen) is much easier to work with
when track repairs need to be performed."
Hmmm ... not quite sure about this one. If, as on the new Whitehorse Rd
track, the concrete is solid up to just below the rail head, and the asphalt
is a thin layer on top, mainly for aesthetic reasons, I can't see where
there would be any maintenance advantage. Surely the asphalt is an extra
complication - though probably a worthwhile one, like the rubber boot.
Now we are on the topic of trackwork - can anyone tell me when Melbourne
track relaying practice switched from constructing a temporary track and
maintaining services around the work (which went on mainly during normal
working hours as far as I know) to the current practice of closing both
services and the road, and working round the clock with heavy machinery over
a weekend? I presume the change pre-dates privatisation.
The use of concrete sleepers on the Box Hill job is interesting. Are they
now used for relays as well? The method used as recently as last August was
to prop the rails on concrete blocks and shims, with gauging and horizontal
alignment ensured by tie-bars and temporary wooden braces, as shown in the
attached I took in Glenferrie Rd. Using sleepers seems likely to be far
easier.
Cheers,
Brent Efford
TechMedia Services
Co-ordinator, Transport 2000+ NZ
PO Box 2626, Wellington 6015
New Zealand
[email protected]
Ph (04) 801 9331, Fx (04) 801 9344
Mob 025 887 387
www.techmedia.co.nz
| Yahoo! Groups Sponsor | |
|
|
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.