2015-03-31 I&S Committee - Item 5 - Attachment 1 - Munna Pt Bridge Repairs Level 3 Bridge Report

Option 1) – Construct new substructure          Option 2) – Repair the existing bridge.
under bridge, as designed by Arup. 50           50-year life if maintenance schedule is
year deck life & 100 year substructure life     properly followed. This option makes no
(if maintenance schedule is properly            special allowance for sea level rises or
followed). From our review of the design        associated canal erosion
report for this option, it appears that there
is no special allowance for sea level rises
or associated canal erosion.
Project delivery cost = estimated               Project delivery cost = estimated
$8,092,247 + GST. This cost would be            $2,783,000 + GST. This cost will be
incurred over 1-2 financial years.              spread over 3-5 financial years.

Important note: These costs DON’T deliver       Cost breakdown: Access craft & scaffolding
any extra bridge width. An additional $2.5      ($175,000) + traffic control (allow $20,000)
to $3 million would be required to supply       + 6 new columns ($180,000) + pilecap
and install a 3.5 metre wide shared path on     beam repairs ($600,000) + cathodic
one side of the bridge                          protection to pilecap beams ($310,000) +
                                                60 pile encasements ($720,000) + deck
Cost breakdown: New substructure (piles,        waterproofing & scupper linings (allow
columns, headstocks & removal of existing       $100,000) + replace deck joints ($75,000)
piles, pilecaps & columns) = $6,031,588         + silane coatings to pilecap beams,
(per Arup 2011 report) + waterproofing &        columns, headstocks, abutments and deck
coating underside of existing bridge deck       underside + sides ($130,000) + clean up
(allow $200,000) + replace deck joints          and coat all stressing bar ends (allow
($75,000) + cathodic protection of pilecaps     $20,000) + design & project management
and piles to ensure 100 year life (allow        costs (allow $ 200,000) + contingency
$380,000) + clean up and coat all stressing     (allow 10%) + GST.
bar ends (allow $20,000) + design &
project     management     costs      (allow
$650,000) + contingency (allow 10%) +
GST.

2017 Maintenance: Recoat bridge traffic         2017 Maintenance: Recoat bridge traffic
barriers and handrailing = allow $50,000 +      barriers and handrailing = allow $50,000 +
GST                                             GST




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