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.
2030 Maintenance: $ 960,000 + GST                2030 Maintenance: $ 1,260,000 + GST

Cost breakdown: Recoat pilecap beams,            Cost breakdown: Recoat pilecap beams,
columns,      headstocks,      abutments,        columns,     headstocks,       abutments,
underside + sides deck (allow $130,000).         underside + sides deck (allow $130,000).
Recoat barrier rails and handrails (allow        Recoat barrier rails and handrails (allow
$50,000). Replace deck wearing surface           $50,000). Replace deck wearing surface
and waterproofing (allow $230,000). Install      and waterproofing (allow $230,000). Install
cathodic protection to deck ($400,000).          cathodic protection to deck ($400,000).
Transformer-rectifier     &       cabling        Contingency for pilecap repairs of ASR
maintenance (allow $150,000)                     cracks (allow $300,000). Transformer-
                                                 rectifier & cabling maintenance (allow
                                                 $150,000)
2050 Maintenance: $660,000 + GST                 2050 Maintenance: $960,000 + GST

Cost breakdown: Recoat pilecap beams,            Cost breakdown: Recoat pilecap beams,
columns,     headstocks,        abutments,       columns,        headstocks,        abutments,
underside + sides deck (allow $130,000).         underside + sides deck (allow $130,000).
Recoat barrier rails and handrails (allow        Recoat barrier rails and handrails (allow
$50,000). Replace deck wearing surface,          $50,000). Replace deck wearing surface,
deck joints and waterproofing (allow             deck joints and waterproofing (allow
$330,000). Transformer-rectifier & cabling       $330,000). Contingency for pilecap repairs
maintenance (allow $150,000)                     of   ASR       cracks     (allow   $300,000).
                                                 Transformer-rectifier          &       cabling
                                                 maintenance (allow $150,000)
Electricity costs for cathodic protection over   Electricity costs for cathodic protection over
50 year life: $42,500 + GST                      50 year life: $42,500 + GST

$500/yr x 15 years (pilecap beams only) +        $500/yr x 15 years (pilecap beams only) +
$1000/yr x 35 years (deck + pilecap              $1000/yr x 35 years (deck + pilecap
beams)                                           beams)




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