Hi Alex,
The first photo below is the first track laid for GCLR1. In the immediate foreground the track has already been set in concrete. further along you can see the steel sleepers, height adjustable from below. A lot more steel would be added there before concert was added. The yellow steel sleepers got buried in the concrete. Sydney seems similar except that their adjustment seems to be done from above.
The second photo at the west side of the terminus tunnel shows the concrete slot which would keep the track in gauge. Where necessary it is built as a curve. But just how these slots are formed, I don’t know as I have not seen them do it, and I don’t expect any more is to be done.
I hope that this explains it adequately,
Regards,
Richard
> On 15 Jul 2017, at 23:50,jg62430@... [TramsDownUnder] TramsDownUnder@...> wrote:
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> Richard,
> Thanks for your reply. I realise that the majority of the track is on concrete sleepers which establish the gauge of the track. However I was curious as to how the gauge is set in the concreted sections. Your reference to the similarity with the CSELR track reminded me of the picture posted some time ago by Matthew Geier of the Sydney construction (http://tdu.to/53397.att http://tdu.to/53397.att) which showed blue adjustable tie-bars attached over the rails being used to set the gauge. Presumably a similar technique was used for the GCLR2 concreted sections?
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> Alex C
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> ---InTramsDownUnder@... mailto:TramsDownUnder@yahoogroups.com, <tressteleg@...> wrote :
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> Alex,
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> Firstly, there is very little concreted track in this project. It appears to be the two level crossings as well as the three tram stops and the track in that immediate vicinity, including the tunnel extension at the present hospital tram terminus.
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> In all those situations they appear to pre-lay concrete with a rectangular slot formed into it, into which the rail and its insulating material is placed. This is basically hows the original Sydney light rail track was laid between Central Station and Paddys market.
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> Stage one of the Gold Coast line was not terribly different from the present system being used in Sydney except for the 10 feet of concrete laid under it!
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> As for photo 4, I have no idea what they are going to do there but I'm quite certain it will not be to dump concrete to fill up the hole. I'll have to keep a watch on it.
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> Regards,
>
> Richard
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> On 15 Jul 2017, at 1:22 pm, jg62430@... mailto:jg62430@... [TramsDownUnder] TramsDownUnder@... mailto:TramsDownUnder@yahoogroups.com> wrote:
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>>
>> Richard,
>> In the mass concrete track, how is the gauge established in the construction process? In the Jetty Rd track it was through tie-rods between the rails whereas in Melbourne it was the use of the half sleepers. In photo 4 the track seems to be constrained by rail bolts screwed into the wooden sleepers.
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>> Alex C
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