Author Topic: Merlin's Bridge - Bridges to be Replaced!!!  (Read 312 times)

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welshcol

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #10 on: December 18, 2018, 05:40:52 PM »
Will be interesting to see what size crane they use for the change out's.
Presume design will be of modular construction with several "small" lifts but will still need a decent size piece of kit to carry out the work with the necessary reach etc.
Will be worth having a "construction party" Bob? so you can sell tickets for the spectacle.  ;) :) ;) :)

Maytree

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #11 on: January 05, 2019, 05:41:39 PM »
The actual swap over of the old to new bridge will not use a crane. They are to use two remote controlled flat bed vehicles (no cabs) with each having two large diameter jacks. The diameter of the jack is equal to the width of the flat bed. When the vehicles are maneuvered into place the four jacks will lift the whole bridge from its mountings, then swung through 90 degs, and slowly brought up to the work area recently created.
The bridge will be lifted off the jacks, your crane Colin?, and the newly assembled bridge put on the jacks and wheeled down the road and lowered into place.

The two weekends before and after the swap over weekend will have single lane working with traffic lights.

There are two more "Drop in Events" arranged at the Merlins Bridge Welfare Hall - Thurs 10th Jan and Thurs 31st Jan - 3pm to 6pm with info on both bridge replacements.

Bob
« Last Edit: January 06, 2019, 08:01:39 AM by Maytree »

welshcol

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #12 on: January 05, 2019, 06:32:29 PM »
Hi Bob- very interesting will try and attend one of those drop in sessions just to try get an understanding of the sequence of events.
I thought they may have gone for a strand jack approach as shown on a number of constructions but they only applicable for a straight lift and not to adjust or turn.


welshcol

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #14 on: January 10, 2019, 05:33:56 PM »
There appears to be a big "heavy" lift crane at present being prepared at the Merlin's Bridge "lay down " site.
Understanding is that the crane will be used for the lift off of the old bridge structure from the mobile multi wheel transporters , as advised previously by Bob, then the new bridge sections will be lifted up into position onto the transporters for moving down the road for final installation via the lifting hydraulic rams and rotating into position  ??? ::)

Maytree

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #15 on: January 11, 2019, 02:18:57 PM »
As Colin says the "Heavy Gang" have arrived.
Here are some images of the crane and other equipment in the compound at the side of the Welfare Hall.
There is a temporary ramp from the road over the kerb into the compound, as this is jutting out into the road so there "stop and go" boards in operation.

Bob

welshcol

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #16 on: January 11, 2019, 05:22:13 PM »
Did you pick a leaflet up?
More a general Q and A rather than construction detail but will post a copy if of interest!?🤔

Also see https://www.networkrail.co.uk/running-the-railway/our-routes/wales/merlins-bridge/
« Last Edit: January 14, 2019, 01:06:18 AM by welshcol »

Maytree

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #17 on: January 13, 2019, 04:17:46 PM »
The New Bridge has now been assembled and final bits worked on.
The photos show a view of the side of it - as in looking up from the road when it's in place.
The other view is from the parapet end, the "orange man" is standing where the track will be.

An idea of how they will lift the old bridge can be seen in this you tube video, apparently only one remote controlled vehicle will be used not two as in the video.

Link - https://www.youtube.com/watch?v=p-864gvmPXM

Bob

welshcol

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #18 on: January 13, 2019, 04:41:12 PM »
Hi Bob- thanks for that.
I asked Carol are you selling tickets!!!! ??

Maytree

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Re: Merlin's Bridge - Bridges to be Replaced!!!
« Reply #19 on: January 19, 2019, 09:06:27 PM »
Today the Pembroke Road Rail Bridge was removed - but not without a fight!

After many hours of waiting it finally came up the road on it's remote controlled transporter.
The first lift happened around 2pm (Scheduled for 10.30am), then rotated 90 degrees ready to be moved.

The pictures show it entering the compound and about to be put on stands, the transporter then lowers its jacks and moves to under the new bridge.
No crane used just the jacking system on the transporter Colin.

Tonight or tomorrow the new bridge will be wheeled down the road and into position.

The transporter has four pairs of wheels in four parallel rows, that's 64 wheels!  - Oops, that should read 32 wheels!

Bob
« Last Edit: Today at 09:56:00 AM by Maytree »