Decision Maker: Executive Director of Transport
Decision status: Recommendations Approved
Is Key decision?: No
Is subject to call in?: No
Following a routine inspection, a significant
defect was found relating to the fixed bearing on Commercial Street
Bridge. It was advised that this should be rectified by Q2 of 2024
to ensure the bridge remains safe.
SYMCA appointed Balfour Beatty through the SCAPE framework under a
design and build contract, to undertake the repair. They
subsequently appointed Mott MacDonald to undertake the design as a
subcontractor.
Mott MacDonald considered a range of design options for the
remedial work, each with a range of benefits, risks and costs
associated and presented these to SYMCA who endorsed a preferred
option to strengthen the bridge diaphragm with the additional of
steel plates bolted through, with remedial concrete repairs where
required.
Balfour Beatty priced the works in accordance with the SCAPE
Framework and approval was requested to appoint Balfour Beatty to
progress to implementation of the preferred scheme at a cost of
circa £375,000
Option A - Approve the appointment of Balfour
Beatty to undertake rectification works on the defect in the
diaphragm above the fixed bearing on the Commercial Street Bridge
through the SCAPE framework at a cost of
£374,214.90.
Option A - Repair and strengthen the diaphragm
with steel plates. This was the chosen and lowest costed option at
between £500,000 and £600,000.
Option B - Repair and strengthen the diaphragm with increased
reinforcement and concrete repairs, but also increasing the size of
the diaphragm. This could impact on the operational tram network
and has a higher cost than Option 1 at around £575,000 to
£675,000 and was therefore discounted as it would take longer
to execute and cost more, as well as reducing accessibility around
the rear of the diaphragm for future inspections.
Option C - Replace all the bearings on the affected diaphragm of
the structure. This is a more extensive operation with an estimated
cost of £2.5M to £3M. As the bearings, with the
exception of the defective fixing around the top of the fixed
bearing, appear to be in a generally good condition, this option
was discounted.
Publication date: 19/07/2024
Date of decision: 18/07/2024
Accompanying Documents: