Riverbed geotechnical bore drilling

You’ll probably have noticed a drilling rig in the river adjacent to the bridge in recent weeks. We understand that in addition to geotechnical bores through the main piers, the rig is in the river to drill bores to investigate the riverbed strata to understand just how strong it is, if and when the Foster-COWI temporary bridge goes ahead.

While the relevant people and equipment are onsite, bores are also being drilled into the foundations alongside Digby Mansions, to ensure the chain anchorages and bridge abutments are in good shape. So far it appears that Bazalgette and his predecessor, Tierney Clark, did good enough jobs, and the foundations can take the extra loads.

The separate ‘stabilisation’ works are progressing, as we reported before, the concrete has been poured into the troublesome pedestals.  However, there have been delays in getting the steel support frames built and ready to lift the main bridge chains, allowing the bearings to be replaced.  That work is yet to start, which means that the delayed schedule for the bridge to open to cyclists this month looks like it’ll stretch out further. We don’t have a schedule yet for when the bearing replacements will be complete and the bridge reopened, restricted to pedal power.

As far as funding the Foster-COWI proposal and full refurbishments are concerned, the LBHF website says that the ‘business case’ was submitted to the DfT in Dec 2022, and our local and affiliate news page threw up this question from Hansard last week mentioning its ongoing review. It’s not clear how much progress this represents.

Meanwhile, MP’s North and South of the river have spotted an opportunity to ask the government to drop a crumb from the post-HS2 feast to progress the project, while also noting the inevitable cost increase, now to over £200m. More than a crumb then – and we’re hungry for a positive answer.

Geotechnical borehole drilling – Hammersmith Bridge

Geotechnical borehole drilling – Hammersmith Bridge