die belebende Bedenkung

The wool over their eyes

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BBC News story (4 July 2001) about the Midland Metro electrocution risk caused by shoddy workSoon after the Midland Metro tramway opened in 1999, evidence of shoddy design and construction began to emerge. Ansaldo and Laing — the ‘A’ and the ‘L’ in the Altram consortium awarded the design-build-and-operate concession in 1995 — had effectively abandoned the tramway as early as 2002, leaving the remaining participant, Travel West Midlands, to pick up the operating losses (the Metro has never come close to carrying the 15 million passengers per annum originally expected).

In a desperate bid to stop TWM handing back the keys, Centro renegotiated the operating concession (the full terms of which have never been made public). The overhead lines had to be completely replaced, years early, at public expense, and the original “rubbish” trams are now being placed in store at Long Marston.

It has also transpired that the building of the street section between Wolverhampton and Priestfield was bodged, resulting in the need for early replacement of the track. During those replacement works in 2014, it was found the tramway had been built over unstable and potentially dangerous mine workings, which has resulted in continued closure of the northern extremity.

[Centro Press release]


Work progresses on replacing tram track in Wolverhampton

The laying of new Metro tram tracks over former mineworkings in Wolverhampton city centre has resumed after engineers devised a way of tackling the unstable and potentially dangerous site.

They were uncovered on the A41 Bilston Road between the junctions with Steelhouse Lane and Hospital Street in November as work progressed on replacing worn out tram tracks.

After intensive efforts to find a safe way of building over the mine, work is now underway with tram services scheduled to resume running into the St George’s terminus in March.

The old mineworkings were up to 40ft feet deep and filled with loose, uncompacted building rubble.

The old workings, which are up to 12m (40ft) deep, 55m (180ft) long and 20m (65ft) wide, are thought to date as far back as the Industrial Revolution, when coal and iron ore was mined extensively across the Black Country.

Centro, the region’s public transport co-ordinator which is behind the £4.5m track improvement scheme, consulted with specialist engineering consultants to assess how best to deal with them.

It also sought advice from other light rail systems in the UK and around the world to see if they had ever dealt with a similar problem and to identify the best solution.

Engineers have now devised a solution consisting of a geo-textile membrane and geogrid to stabilise the ground, in between layers of compacted hardcore and capped with a reinforced 5m wide concrete slab running through the 55m length of the workings.

Midland Metro programme director Paul Griffiths said at some point down the years the workings had been filled in with old building rubble then covered over without being marked on any known map or documents.

“The problem was that rubble was not compacted down, it was thrown in loose and covered over, and over time loose rubble shifts and creates voids,” he said.

“Having installed a modern new crossover south of The Royal we came to remove the foundation from the previous crossover and that’s when we found the mine workings.

“We had undertaken ground investigation in advance of the works including using ground penetrating radar, but this did not identify all the issues.

“It was only when we were able to open up the ground and make a full analysis that the sheer scale of the problem became clear.”

The timetable had already been hit by the discovery of unmarked public utility pipes and the discovery that the original track slab was not as strong as designed and required additional work to ensure it does not deteriorate in the future.

Originally planned to open in November, The Royal opened the following month.

However an announcement on when services would resume to St George’s could not be made until the evaluation of the workings and design of a solution was completed.

That happened this week (January 26-30) following intensive ground investigation and design work over Christmas and New Year.

Mr Griffiths said: “The design of the solution has been complicated by the location between the two carriageways of Bilston Road.

“This has prevented the material from simply being dug out as it could have damaged the integrity of the road.”

While this took place, rebuilding work of the new St George’s terminus was accelerated and new track laid heading out to The Royal.

Cllr Roger Horton, Centro lead member for rail, said: “The delays have been incredibly frustrating and we recognise the impact they have had on users of the Midland Metro for which we apologise.

“However these works have had to be done. An operational tram system has to have secure foundations, and now that this is being done the Midland Metro will provide Wolverhampton with a system it can be proud of for years to come.”

The original contractors pulled the wool over Centro’s eyes, resulting in huge costs for the public purse.

Written by beleben

February 12, 2015 at 4:08 pm

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