Presented by: Nam Do Tom Wazny · • Piers effectively reduced each span by 4 m each side • Reduced deflection ... other functions held in this area •Tide daily movement •Twice

Presented by:Nam DoTom Wazny

1

• About BridgePro

• Tender Package & Client Requirements

• Design Challenges

o Flooding

o Vibration

• Construction Methodology

• Additional Features

Slide 2

Topics Discussed:

Bridge / Piling and Marine construction contractor in Tasmania

• Founded 2010 – Latrobe (North West region)

• 50 employees

• Competitive market

• Design & Construction packages

Aim: deliver the safest and most economical solution

in the shortest practicable timeframe

Slide 3

About Us:

Slide 4

Marine Construction

• Piling, Wharves, Dolphins

• Modular Road Transportable Jackup Barge

Double T Beam Bridge

• Up to 15 m long spans

• SM1600 rating

• 4 day replacement from demolition, piling, installation and roadwork

Slide 6

Tub Beam Bridge

Slide 7

• Typically 18+ m spans

• SM1600 rating

• Modular alternative to Super T Beams

Pedestrian Bridges

Slide 9

• 5+ kPa rating

• Walking Tracks

• Multifunction Bridges

Seaport Pedestrian Bridge

Slide 10

Client Requirements & Tender Process

• Client requirements

• Public Use and Access

• Minimal Maintenance

• Light Service Vehicle Access

• Tendering:

• Original and alternative options

• Short timeframe

Slide 11

Conforming Design

Alternative Design

Low Cost Bridge Solution

Matagarup Bridge Yandhai Nepean Crossing Seaport Pedestrian Bridge

Swan River - Perth370 m long x 8m wide x 72m heightCompleted in 07/2018 (from 11/2015) Budget: $M 91.5

Nepean River – Sydney NSW250m long x 8m wide x 13m heightCompleted in 10/2018 (from 12/2014)Budget: $M 50.0

Tamar River – Launceston TAS120m long x 4m wide x 1.5m heightCompleted in 07/2018 (from 12/2017)Budget: $M 2.4

Slide 12

Design Challenges:

• Flood loading

o High flood Level

o Log impact design

o Complex hydrodynamic study

• Vibration

• Long Spans

• Geometric limits

Slide 15

Geometry Restrictions:

• Long spans: 40 m at centre

• Waterway access maintained

• Pedestrian walkway grades

• Height limit: RL 7.0 m AHD

• Flood level: RL 5.2 m AHD

Slide 16

1:33 RampFlat1:14 Ramp(3 landings)

~ 1.5 m Truss Depth

(With clearance)

• AS4100 and AS5100 Standards

• 5 kPa loading

• 20 kN Vehicle point load

Slide 17

Structural Design Inputs

• 20 kN point loading

• Strategic beam placement – typical tyre placement

Slide 18

Vehicle Access

• AS4100 and AS5100 Standards

• 5 kPa loading

• 20 kN Vehicle point load

• Flood Loading

• Vibration

• Soil stiffness profiles

Slide 19

Structural Design Inputs

• Silty swamp at the surface

• Firmer rock below

Slide 20

Piling and Soil Stiffness

0 m

5 m

10 m

Silt

Doleritecobbles

Sandstone/ Mudstone

20 mTypical Pile Toe

Flood Analysis:

• Complicated Hydraulic Model

• Collison impact by 5t vessel

moving at 20km/h

• Buoyancy and lifting reduced by

pile brace blocks

Slide 21

• Increased lateral stiffness

• Reduced effective span

• Improved deflection and

vibration amplitude

• Viewing platform

Slide 22

Quad Pod Pier

• Piers effectively reduced each span by 4 m each side

• Reduced deflection

• Reduced vibration amplitude

Slide 23

Quad Pod Pier

• 95 t superstructure

• Tubular truss

• 3 Chords per Side

o Lateral Stiffness

o Torsional Stiffness

Slide 24

Truss Geometry

• Torsional Stiffness

o Reduced floor member deflection

o Localised deflection acceptable

o Semi-fixed transverse members

Slide 25

Truss Geometry

Vibration Analysis:

Slide 26

• Slimmer and longer bridge (spans)

• Different models were analysed to determine

the natural frequency of the bridge

• Final results:

o 1.77 Hz lateral

o 3.64 Hz vertical

• Allowance for retrofitting proprietary

damping if required.

• Pier Connection

• 5 Tubes Connecting to Welded Column

• Durability Considerations

Slide 27

Challenging Connections

1

2

3

4

5

Span

Pier

• Pier Connection

• 5 Tubes Connecting to Welded Column

• Durability Considerations

Slide 28

Challenging Connections

Construction Challenges

Slide 29

Construction Challenges:

• Small, restricted area behind rowing club

• Unstable ground - retaining wall required

oContainer base platform with screwed piles

oCondition monitoring before/during and after piling

• Temporary piles to anchor temporary bridge for loading/unloading to barge

Slide 30

Existing bank retaining wall

Flood levy

Work-site zone

Containerbase platform

Bank stability with amour rock


• Siteworks began in December 2017• Working hours restricted

due to hotel’s resident and other functions held in this area

• Tide daily movement• Twice a day up to 5m high

• Risk of construction barge bottoming out

Slide 31

Seaport pile group location


• Seaport piling• Slow water flow create a

high build-up silt depth

• Not suitable for jack-up barge

• Small operation window: set-up barge / position pile-guide frame / pitching and then piling

• Tight tolerance allowable due to precast pile brace block.

Slide 32


• Seaport piling• Slow water flow create a

high build-up silt depth

• Not suitable for jack-up barge

• Small operation window: set-up barge / position pile-guide frame / pitching and then piling

• Tight tolerance allowable due to precast pile brace block.

Slide 33


• Equipment limitation

• Limited timeframe due to weather conditions

• Installed by components rather than by span sections using hydraulic lifting bed and tide movement with jack-up barge.• Unstable due to unbalanced

weight• Using pile brace block as a

counter weight along with existing temporary screwed piles

• Small footprint limiting crane capacity (130T)

Slide 34

Bridge fully assembled within 9 days

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D4


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D5


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D7


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D8


Slide 43D9

• Programmable Lighting

• Handrail Integrated Lighting

• Electrical / Water Services at each pier

Slide 45

Additional Features

Slide 46

Additional Features

Documents

Presented by: Nam Do Tom Wazny · • Piers effectively reduced each span by 4 m each side • Reduced deflection ... other functions held in this area •Tide daily movement •Twice