Civils and stations

08.04.08

Mound Tunnel lowering & Waverley Bridge girder works

Network Rail's Transport Scotland funded £150million upgrade of Edinburgh Waverley Station's tracks and platforms was completed on schedule and within budget on 16th November 2007. The work provided half a mile of new and extended platforms including four new platforms numbered 1, 3, 10 and 20. The station was also provided with two new escalators and two new passenger lifts.

While this was going on, over two miles of new track was laid as part of the extensive remodelling and 37 new signals commissioned enhancing station capacity. During the Christmas and New Year blockade, which was safely and successfully delivered , the tracks running through the middle Mound Tunnel were lowered providing clearance for electrification works and around 100 bases and other electrification structures were installed in the tunnel and on the Waverley Bridge.


Track works

The track works completed during the blockade consisted of:

• Track bed lowered by 230mm (including “points 157”) and 180 metres of new track installed.
• 110 metres (approx.700 tonnes) of new chips installed on both lines X and Y.
• New crossing panel for 161 points installed and closure rails cut to suit.
• Renewed ballast from out with the Mound Tunnel for a distance of 140 metres.

Girder works

The works to the girder completed during the blockade consisted of:

• Installation of temporary works foundations.
• Trestles erected and jacked to design levels and monitored for settlement. When rate of settlement had reduced to a level that allows jacking loads to be maintained, cutting of the girder to a depth of 300mm commenced.
• South side of the girder (over roads 14 and 15) cut approximately 8 metres in length and to a depth of 300mm. Then bottom flange removed and replaced with the new 30mm thick steel flange plate.
• North side flange (over roads 16, mid road and 17) cut approximately 11 metres and to a depth of 300mm and removed before new 30mm thick steel flange plate was fitted.
• Approximately 730 steel plates, angles, splices and flanges, weighing approximately 31 tonnes, installed for strengthening of the girder and fitted using circa 7000 bolts.
• Final welding, bolt installation and inspection carried out before the removal of the jacking loads and monitoring equipment.
• Removal of trestles and temporary works foundations.
• Track / platform surveys were undertaken on completion of the works prior to bringing back into operational use.

Signalling

The signalling works consisted of disconnections and reconnection works.

OLE

OLE works within Mound Tunnel were as follows:

• 220 metres of Furrer and Frey rigid conductor bar installed within the Mound Tunnel.

Civils

Civil works carried out and completed were:

• Sandstone invert cut in Mound Tunnel – cut depth varied between 20mm and 80mm.
• Sandstone rib cut on both sides of the tunnel to approximately 140mm depth to accommodate clearance for “pantograph”.
• 170 metres of drainage installed in 6 foot between lines X and Y throughout tunnel.

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