Hammersmith Bridge closed: Motor traffic:10th April 2019; Completely:13th August 2020

After much media/social media coverage, including stories on London TV news, a task force was set up on 9 September, chaired by Baroness Vere (roads minister), which includes representatives of the local councils, TfL and Network Rail (for their experience of cast iron bridges), the Port of London Authority and GLA. The task force’s project director is Dana Skelley, a chartered civil engineer, formerly director of roads for London and responsible for the London-wide roads modernisation ahead of the London Olympics and the repairs to Hammersmith Flyover.

Completing the full repair of the Bridge is currently predicted to cost £141-£163m, with stabilisation just to allow safe pedestrian and river traffic at £46m, considerably more than first envisaged.  We covered the announcement of a temporary pedestrian/cycle bridge in April, which is believed to have been costed at less than £10m.  Before lockdown, planning was to be sought for this during the summer with construction starting this autumn, but this has not happened.  We followed up in June with our ideas about widening the pathways while work progresses elsewhere, making the bridge suitable for safe bidirectional cycling and walking; these are also clearly ideas yet to be considered given the new circumstances of complete closure.

Neither the Council nor TfL can finance costs at this level, so government support is essential. The possibility of tolls to finance the work has not been ruled out, indeed some are campaigning for this to make more funds available to speed up the work.

The disappearing Crossrail opening date

Construction projects still typically employ analogue leaders in a digital age

Mega transport projects are almost always fraught with delays and cost overruns because of the often inappropriate governance and leadership.  Inappropriate leadership – really ? Surely they’re run by Captains of Industry with huge experience and many letters after their names ?  But the leadership is most often bound up with the management of high budget, and perceived high risk items, such as tunnelling with Tunnel Boring Machines (TBM) – the so called “bricks and sticks” – often 80%+ of the budget.

Another day at the TBM office (here for the SuperSewer)

Appointments like these often address last century’s problems, a bit like taking over a British Leyland production line, only to discover that it’s now staffed by strike-free 🔗 German-made robots, seemingly little delayed by the pandemic, at least here in Hammersmith. These elements are significantly lower risk than they once were, because of such mechanisation and associated technologies, engineered processes, resulting in tighter controls and more repeatability “at the coalface”, even though still beloved of TV documentaries with some false jeopardy added to spice them up.  Still, documentaries do serve a valuable purpose in illustrating the point – the operator at the controls of the TBM deep underground is using a computer keyboard, mouse, several screens, a desk phone, with not a shovel in sight.

To re-purpose a phrase from the last decade, these projects still typically employ analogue leaders in a digital age.  It’s commonly assumed that the “backroom boys” will sort of the hidden techie stuff – keep out of the detail.  WRONG!  This is where the risks are nowadays, in signalling and other heavily software-based systems, sometimes poorly designed code, frequent legacy issues, often clunky low-performance or de-facto interfaces (sometimes as simple as on/off dry contacts, AKA electromechanical relays, or their software equivalent “control points”), logical “gotchas” and subsequent system integration problems.

The issue is peculiarly amplified in railways, where proven operational safety is expected, yet a lot of what could provide that – 100% reuse of existing proven designs, robot style, ironically more akin to a modern tunnelling process – allowing the project to focus solely on what must be changed, is in this environment, swamped by commercial, time, perceived risk, or political pressures to use this supplier or that solution. This results in yet another bespoke railway with the inelegant compromises that Heath Robinson would recognise.  Amplifying the misconception that the project is some sort of smooth production-line shown in the plans, the term “production design” is regularly misused, whereas the earlier compromises mean the endeavour has unwittingly become a “prototype design” – the approach to building a unique prototype like Crossrail or HS2 vs. a production design for 1000, or 100,000 units a year are rather different – your scribe has done all three.

Future leaders should present their software engineering credentials at the door

Hammersmith Bridge underside and steelwork – May 2020

The Society’s committee is of the view that as part of the renovation work, there is a great opportunity to improve the Bridge to make it better suited to future needs, requiring more space for pedestrians and cyclists, as mentioned in our last article.  Our proposal is to widen the pathways to allow safe and satisfactory bidirectional walking on one side, and bidirectional cycling on the other, so that cyclists no longer need to compete with road traffic, significantly improving safety.  Currently, because of the somewhat narrow walkways, it’s not possible to safely cycle or even pass easily when walking, certainly not in a wheelchair or buggy.  We think this can be done both at modest cost (certainly compared with the 🔗Garden Bridge!) and largely independently of the planned repair works, so as not to lengthen the closure.  We have a brief update on repair works at the foot of this article.

The bridge’s narrow pathways for most of the span measure approximately 1.6m, widening at the pillars to approximately 1.8m, but still too narrow for bikes to pass safely (one of the reasons cyclists have to dismount currently), let alone to support social distancing needed now, and possibly in the future.  We’ve now looked at the structure in a little detail, and, as shown on the photos here, the pathways are supported by simple cantilevers, apparently bolted on.

Hammersmith Bridge – historical repairs (photo: Keepingthingslocal)

Steelwork underneath the bridge was repaired section by section in the 1970’s, and a new grid of substantial longitudinal girders replaced the originals (pierced where bridge hangers meet the deck). Historic photos (right) show the original, very much less substantial steelwork.  Given the scope of the repair works, and amount of money and time to be spent on repairs, there seems little reason not to now consider the attached pathways in more detail, especially if the planned temporary bridge removes the need to keep it open during the works.

TfL is planning a temporary footbridge parallel to Hammersmith Bridge at the request of H&F Council, to assure pedestrian and cycle transit throughout the repair programme.  The aim is to give over the entire Bridge space to the continuing works, with the result that the total closure time could be reduced by 9-12 months.

Hammersmith Temporary Bridge

In an online webinar on 3 April (replacing planned exhibitions which had to be cancelled), representatives of TfL and LBHF set out their scheme for a prefabricated steel structure supported by 2 piers in the riverbed, on the downriver side of Hammersmith bridge. It would be the same height as the Bridge and would have no impact on river traffic.   The usable deck would be 5.5m wide and there will be separation of cyclists and pedestrians (no motorbikes allowed).

Access would be via Queen Caroline Street on the Hammersmith side via gradual ramps. It would take 6-7 months to complete, and planning permission would stipulate it being in place for up to 5 years, with the aim of re-using the structure elsewhere afterwards.

Keeping foot and cycle traffic flowing has to be a welcome initiative. The one downside is that the structure would close the Thames Path on either side, meaning a detour – possibly via the rear of Riverside Studios or past the Apollo and round by Fulham Palace Road on the North side, and via Riverview Gardens on the Barnes side.

Meanwhile the pedestals, hangers, chain bearings and hanger connections are being worked on and acoustic monitoring of the Bridge structure continues. A detailed Scope of Works together with costs is expected later in the spring. The new deck will be steel, with resin on top, which will perform far better than the asphalt over boards which were alarmingly visible previously. The repairs will give 60 years of design life. 

Can we make the restored and repaired bridge work better in the future ?

Continued →

Planters under flyover

St. Augustine’s – Interior

Hammersmith Grove Parklets – East

Plants not pollution – Hammersmith Flyover

Hammersmith Grove Parklets – West

St. Augustine’s interior

Paintbox Studios and Coffeeology

Summary

In our 30th year of Awards, we renamed our Conservation Award the Tom Ryland Award for Conservation in honour of our past Chairman. We were delighted to present it for the first time to St. Augustine’s Church in Fulham Palace Road.

There were four Nancye Goulden Awards this year, in two distinct pairs, all are projects which have made positive contributions to the Hammersmith streetscape.

The first two are King Street shop fronts: Paintbox Studios and Coffeeology. The other two awards recognise another type of improvement to the streetscape in the form of the Hammersmith Grove Parklets and The Planting under the Flyover.  The wooden spoon went to phase 1 of Sovereign Court.

We were also given a detailed presentation by SSPARC architects covering the history of Olympia and the extensive redevelopment plans, followed by an update from RSHP architects covering the Town Hall redevelopment plans. In a Q&A session, Councillor Wesley Harcourt kindly gave us an impromptu update on the Hammersmith Bridge situation.

Cllr Harcourt describes Hammersmith Bridge problems

At our AGM on 12th June, members of the audience asked a number of questions about the Bridge.

As we reported in our recent newsletter and over the previous 4 years, the bridge has been in trouble for a long time, not helped by a couple of bomb attacks in its history.

Fortunately Councillor Wesley Harcourt (Cabinet Member for the Environment) was in the audience, and offered us an impromptu update on the works to repair it.  He made it clear that the Council is committed to repairing it as a fully working bridge, and that final decisions on the scope of work are yet to made as they depend on the level of funding available from TfL (who want to run double-decker buses), and the Government.  The two key issues appear to be:

1. The level of structural repair, over and above the minimum required to run the original 7.5 Tonne vehicles, is dependent on the funding available.
2. The funding is not yet all in place (principally Government, which as we know is otherwise distracted)

He described the cracks found, and mentioned the details, photos and videos available on the council website here. He also described the effect on traffic on other bridges and roads, notably Chiswick, Putney and to a lesser extent Wandsworth, plus the apparent disappearance of 25% of the bridge traffic, though that may be variability and measurement error. He noted that more environmentally-friendly electric buses actually weigh more due to the batteries, just to add to the mix.

He committed to the council finalising plans and schedule in August, though we have no idea how long the work might take as yet, due to the many variables, and 3 years remains the disappointing figure quoted. We urge the council to embark on the essential repairs as soon as practicable, notwithstanding Government inertia. The outcome of these discussions can’t be resolved soon enough.

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The Special 20-page Anniversary Newsletter has been published, celebrating 30 years of Hammersmith Society Awards. Printed copies are being distributed to subscribing members.