2013-08 barangaroo headland park ea presentation rev00
TRANSCRIPT
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BARANGAROOHEADLAND PARKENGINEERS AUSTALIA SYDENY DIVISION,CIVIL AND STRUCTURAL PANEL
Ken O’Neill BSc(Eng) CPEng NPER MIEAust, Aurecon Andy O’Driscoll BSc (Hons), Lend Lease
27 August 2013
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SpeakersKen O'Neill - Bridges Leader NSW, AureconContact: [email protected] Ken O'Neill is a Chartered Engineer and Aurecon's NSW Bridges Leader. He is also the 2013chair of the Engineers Australia Sydney Division Civil and Structural Panel. Ken has worked onsome of Sydney's most recognised bridges including the Sydney Harbour Bridge and ANZACBridge. Ken was the Design Manager for Civil and Marine works on the Barangaroo HeadlandPark project.
Andy O'Driscoll - Senior Project Engineer, Engineering, Lend LeaseContact: [email protected] Andy O'Driscoll is Lend Lease's Senior Project Engineer for the Building and Civil Zone on theBarangaroo Headland Park and has been involved in the project for over a year primarily in
delivering the building structure. Andy has over 10 years' experience in the industry covering amultitude of sectors from multiple Bridges, Rail, Buildings, Roads and Earthworks. Andy hasspent the last 5 years since emigrating to Australia in Sydney working for Leighton's on theKingsgrove to Revesby Quadruplication (K2RQ) within the Bridges and Building zones.
Presentation Overview
mailto:[email protected]:[email protected]:[email protected]:[email protected]
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Part 1 – Project overview
Part 2 – Civil and Marine
Part 3 – Cultural Space & Construction
Questions
Presentation Overview
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Part 1 – Project overview
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Project Overview
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Project Overview
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Project Overview
Link to animation
http://www.youtube.com/watch?v=hvx-RvLaoYY&feature=relmfu
http://www.youtube.com/watch?v=hvx-RvLaoYY&feature=relmfuhttp://www.youtube.com/watch?v=hvx-RvLaoYY&feature=relmfuhttp://www.youtube.com/watch?v=hvx-RvLaoYY&feature=relmfuhttp://www.youtube.com/watch?v=hvx-RvLaoYY&feature=relmfuhttp://www.youtube.com/watch?v=hvx-RvLaoYY&feature=relmfuhttp://www.youtube.com/watch?v=hvx-RvLaoYY&feature=relmfu
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Project Overview
– Client – Barangaroo Delivery Authority – Superintendent - Evans & Peck
– Contactor – Baulderstone (Now Lend Lease) – D&C
– Value - $163m with a further $35 m optional
– Current scope covers Separable Parts 1&2 – Headland and NorthCove
– Separable Parts 3, 4, 5 & 6 covers the integration works, Centralforeshore, Central interim use, Cultural Space future use andHarbour Control Tower design development.
– Contract Award 23 May 2012 – Contract Program 35 Months (includes for wet weather and some
contingency)
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Project Overview
Project Award 23 May 2012
Planning/Design Phase June 2012 - Jan 2013
CFEMP approval (Environmental) August 2012
Main Compound Construction Late August 2012
Construction started November 2012
Northern Cove September 2013
Building Commencement September 2013
Project completed May 2015
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Project Overview
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Project Overview
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Project Overview
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Discipline Service Consultant
Civil and Marine Civil and earthworks Aurecon
Civil Hydraulics Warren Smith and Partners
Electrical WEBB
Geotechnical AureconLandscape Architect Johnson Pilton Walker
Marine Hyder
Building Architect WMK Architecture
Electrical WEBBHydraulics Warren Smith and Partners
Mechanical Waterman
Structural Aurecon
Design: Process
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• Design program driven by construction
• Safety in Design undertaken for allpackages
• Maintenance and sustainabilityconsiderations
Design: Process
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Part 2 – Civil and Marine
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Civil and Marine
• Retaining walls
• Sewer Pump Station relocation
• Stormwater/Seepage water retention• Earthworks
• Harbour Foreshore
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Cultural Space
Counterfort RW
Northern RampRW
Terraced RW
Foreshore area
Pump houseSPS14
Southern RW
Design: Site layout
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Rock excavation to create
car park for Culture Space
Counterfort
Wall Existing
ground Surface
Foreshore
area involvingcaisson
demolition
Fill up for
Headland Park
Culture Space
Roof for Culture
Space Future park level Terrace wall
Ground anchor
at each
buttress
Design: Site layout
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Design: Retaining walls
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Design: Retaining Walls
• Retaining walls around Cultural Space
– Counterfort wall
– Southern retaining wall
– Northern ramp wall
• Terraced retaining walls
• Northern Cove retaining walls
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Design: Retaining Walls
Retaining Walls around Cultural Space
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Design: Retaining Walls
C lt l S R t i i W ll
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Counterfort Retaining Wall
• Extends approximately 160 m in length withoutmovement joints
• Separates the park from the Cultural Space with amaximum retained height of 19 m
• Supports the roof of the Cultural Space
• Provides restraint to the roof against earthquakeloading in the N-S direction and western direction
• Supports two future floors at RL8.5 and RL13.0
• Located on the western ledge of the sandstoneextraction pit
Cultural Space Retaining Walls
C lt l S R t i i W ll
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Counterfort Retaining Wall
Cultural Space Retaining Walls
C lt l S R t i i W ll
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Counterfort Retaining Wall
• Vertical Buttresses 4 m deep at 6 m spacing with permanent groundanchors
• Buttresses are 550 mm thick with a widened back flange of 1000 mm by600 mm
• Base slab of 5.5 m width with 1 m toe
• Shear key at heel provides additional sliding resistance and structuralstiffness to the base slab
• Very efficient wall thickness – 6m Lower section: 750 thick – 6m Middle section: 600 thick – Remaining top section: 400 thick
• Sill beam at top of wall provides vertical support to the roof and lateralstiffness to the upper 400 mm thick wall
Cultural Space Retaining Walls
C lt l S R t i i W ll
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Geotechnical constraints
• Made ground (demolition rubble, ripped sandstone) to an approximatedepth of 1.2 m (RL1.75)
• Shallow sandstone bedrock below Made ground
– Class III at approx. RL1.75 m below ground
– Class II at approx. RL -1.0 to RL-1.5
– Class I at approx. RL -4.0
• Persistent clay seam throughout the site of varying depths
• Design parameters for founding level at RL 1.0 adopted for SandstoneClass IV
Cultural Space Retaining Walls
C lt l S R t i i W ll
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Shale Band Sandstone Footing Base Shear Key
Cultural Space Retaining Walls
Counterfort Retaining wall
C lt l S R t i i W ll
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Design loading
• Lateral Earth Pressure φ=28o, c’=3-5kPa, γ=18kN/m3
• Overburden soil = 500-800mm
• In Service Live Load: 7.5 kPa
• Construction surcharge : 10 kPa
• Earthquake loading
• Loading from two future floor within Cultural Space
Cultural Space Retaining Walls
C lt l S R t i i W ll
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Durability Requirements
• Design Life: 100 years to AS5100.5-2004 Bridge Code
• Concrete exposure classification: B1 for front face and B2
for back face in contact with soil• Drainage detailing and crack width control critical to the
design
Cultural Space Retaining Walls
C lt l S R t i i W ll
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Constructability Requirements
• Wall constructed with a backward lean of 1:120
• No movement joints
• Designed for 9 m of fill without anchors to advance the filloperations
• Additional reinforcement placed at connection to base slabfor crack control
Cultural Space Retaining Walls
C lt l S R t i i W ll
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Key Geotechnical Design Parameters
Variable Value Varianceapplied
angle of fr iction retained material ( ) 28 10%
density of retained material (kN/m3) 18 7%
angle of friction for sandstonebedding or foot ing base (
) 33 15%
angle of friction for sandstone
bedding or shale bands ( ) 24 15%
Anchor capacity (kN) 5000 30%
Surcharge (kPa) 28 15%
Water pressure behind the wall (kPa) 1/3 the height 50%
Cultural Space Retaining Walls
C lt l S R t i i W ll
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• Anchors are installed and stressed at 9 m of fill (35 mm movement intop of wall)
• Narrow base slab allows an “Active” soil stress to be achieved
• 3D Plaxis model was used to:• Investigate soil-structure interaction and confirm Ka stress state in soil
• Determine size and required stress in the anchors
• Determine in-service deflection of the wall
• Determine in-service bearing pressure demand on foundation material
– Front wall slab was designed to Ko to allow geotechnical design toalways govern
Cultural Space Retaining Walls
C lt l S R t i i W ll
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Fill Fill Fill
Mode 1:
Sliding Along
Base or Shale
Band
Mode 2:
Overturning
About Toe
Mode 3:
Overturning
About Anchor
Head
Fill
Sandstone
Excavation
Shale band
Mode 4:
Bearing
Capacity
Failure
Cultural Space Retaining Walls
Counterfort Retaining wall
C lt ral Space Retaining Walls
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Plaxis 3D Model
Assessed Vertical Soil Stress Assessed Lateral Soil Stress
Cultural Space Retaining Walls
Cultural Space Retaining Walls
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Buttresses
Sill beam
Top of baseslab
Cultural Space Retaining Walls
Behaviour of front wall
Cultural Space Retaining Walls
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Cultural Space Retaining Walls
Cultural Space Retaining Walls
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Cultural Space Retaining Walls
Cultural Space Retaining Walls
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Cultural Space Retaining Walls
Southern Retaining Wall
Cultural Space Retaining Walls
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Cultural Space Retaining Walls
Northern Access Road Retaining Wall
Cultural Space Retaining Walls
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Cultural Space Retaining Walls
Northern Access Road Retaining Wall• Designed as a propped beam• Utilises rock mass on other side for
stability
• Varies in height and thickness overlength• Ground anchors stabilise the base• Waterproofing behind wall• Designed for K0 soil pressure due to
rigid prop at top of wall• Semi-integral connection to roof to
allow precast girders to remain simplysupported
Cultural Space Retaining Walls
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Cultural Space Retaining Walls
Northern Access Road Retaining Wall
Terraced Retaining Walls
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Terraced RW
Foreshore area
Terraced Retaining Walls
Terraced Retaining Walls
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Terraced Retaining Walls
Conforming Design
Tender Design
Terraced Retaining Walls
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Terraced Retaining Walls
Key considerations
– Robustness of walls to dealwith tree roots
– Aperture of geogrid throughthe landscape zone
– Size of units for lifting intoplace
– Colour and finishes
On site trial
Terraced Retaining Walls
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Terraced Retaining Walls
Magnumstone RSW
Terraced Retaining Walls
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Terraced Retaining Walls
Terraced Retaining Walls
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Terraced Retaining Walls
Terraced Retaining Walls
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Terraced Retaining Walls
Terraced Retaining Walls
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Terraced Retaining Walls
Terraced Retaining Walls
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Terraced Retaining Walls
Global Stability in Slope-W
Northern Cove Retaining Walls
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Northern Cove Retaining Walls
Precast L-shaped retaining walls
Northern Cove Retaining Walls
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Northern Cove Retaining Walls
Precast L-shaped retaining walls
SPS 14 Relocation
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SPS 14 Relocation
SPS 14 Relocation
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SPS 14 Relocation
SPS 14 Relocation
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SPS 14 Relocation
SPS 14 Relocation
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SPS 14 Relocation
Key considerations
– Condition of the wet well
– Fragile brickwork structure given its age
– Minimising deflections to control cracking – Condition of brickwork for lifting
– Constructability
SPS 14 Relocation
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SPS 14 Relocation
SPS 14 Relocation
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SPS 14 Relocation
Simplified analysis
SPS 14 Relocation
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SPS 14 Relocation
Steelwork modelled separately to size members
SPS 14 Relocation
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SPS 14 Relocation
Contact analysis
Water retention tanks
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Water retention tanks
Key considerations
– Safety issues below water table
– Interface with other construction works
– Separation of seepage water and stormwater – Buoyancy
Stormwater retention tank = 1250 m3
Seepage water tank = 220 m3
Pump room = 50 m2
Water retention tanks
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Water retention tanks
Detailed design
Water retention tanks
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Changing site conditions dictated the sandstoneexcavation pit needed to go deeper.
This led to an innovative design alternative being
pursued.
All tanks including a seawater heat exchange
chamber previously located in the foreshore wererelocated into the Cultural Space.
Water retention tanks
Water retention tanks
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Water retention tanks
Final design
Water retention tanks
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Water retention tanks
Water retention tanks
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Water retention tanks
Water retention tanks
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Water retention tanks
Water retention tanks
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ate ete t o ta s
Revised key considerations
– Flooding within Cultural Space Carpark
– Durability of pipes under 18 m of fill
– Separation of seepage water and stormwater – Buoyancy
– Integration with Cultural Space columns
– Interface with sandstone extraction program
– Interface with the counterfort retaining wall
Water retention tanks
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Risk mitigation
– Penstock at foreshore with overflow to Harbour
– Early weather warning system to empty tanks in advance of
storm – Sealed tank with pressure lids
Earthworks
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Key considerations
– Maximise general fill won on site
– Collect seepage water
– Build up the park to underside of landscaping level
Earthworks
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Earthworks
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Earthworks
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Marine
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Key considerations
– Meet landscape architects design intent
– Interpretation of the original shoreline
– Replicates natural jointing in sandstone
– Logistics of sandstone extraction, processing andplacement
– Make it constructible
– Suitability of sandstone in marine environment
Marine
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Marine
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Marine
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Innovations for sandstone placement
– 12D Earthworks model
– 3D Revit Model
– Attributes assigned to each block
– Individual barcode for each block – Tracked from birth to grave
– GPS utilised for excavation and sandstone placement
– Scaled down models
– 1:1 site trials
Marine
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3D Revit model
Marine
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Scale down model
Marine
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Marine
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Marine
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Marine
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Marine
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Marine
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Marine
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Marine
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Marine
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Marine
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3D Revit model
Marine
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Marine
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Marine
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Cutting existing caissons
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Part 3 – Cultural Space &
Construction
Cultural Space
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Key considerations
– Maximise use of precast concrete for safety
– Long span roof beams to meet project brief
– Construction program
– Sandstone extraction pit – Future flexibility for a multiple use space
Cultural Space
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Building consists of the following:- B3 Irrigation retention tanks- Basement car parks B2 & B1
- Cultural Space @ Ground floorcomprising of a single internalspace 120m Long, 50m wide and15m high.
- Café & Forecourt- Green Roof
Cultural Space
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Building Sequence• The building is unique in the manner
the external walls are all finished tofull height prior to any internalconstruction.
• It has an existing rock-face cuttingwhich forms the Eastern face andnew counterfort retaining walls on
Western and Southern elevations.
• Access for construction is extremely
restrictive due to the Existing Parksand residential to the East and theEarthworks and Park construction tothe West.
• The construction of the building hasto been sequenced utilising only the
space within its own footprint.
Cultural Space – B3
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• B3 tanks made up of the rainwater tank,
seepage tank & Pump room.• The tank structure is integral to the
columns and foundations for the building.• The pump room has its own stair access
from B2.
• The tanks aredesigned to dealwith the upliftcaused by thewater pressureat depth
• All walls andslabs are heavilyreinforced and300mm thick.
Cultural Space – B2
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• B2 150mm Slabon Ground
• Slab to have a300mm drainagelayer beneath
• Column padfootings to befounded on
sandstone.
Northern Ramps• Access for Cultural Space car parks
and loading dock is from Towns Placein the North
• Internal Ramps include an Entry B1ramp on the east flowing through aone way system down to B2 and thenan Exiting on the B2 ramp on the west
Cultural Space – B1 Level
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• Post tensioned banded beamsuspended slabs are to beutilised for both B1 andGround floor Slabs.
• 2 Stair cores are utilised onein the north and one in thesouth and a lift core in the
south servicing all levelsincluding the café and rooftaken you to the heart of thepark.
Cultural Space – Ground Floor
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• Similar system to B1 except15kPa design live load.
• Plantrooms at RL8.5 atnorthern end.
Cultural SpaceC fé d li k M R
- Café @ RL13 to be located at thesouthern end of the roof in a insitusection of the main roof
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Café and link to Munn Reserve section of the main roof.- The L-shaped structure forms the
café which has an externalforecourt opening out into the park.
- The eastern structure forms aLandbridge into the existing MunnReserve.
Cultural Space
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Building Footprint
- The building structure starts on the
southern side of site and wrapsround the existing rockface all theway to Towns place on the northernedge.
- The Extraction pit is required to betaken down to a minimum of RL (–)4for the B2 level Basement Car parkand RL (–)7 for the B3 tanks.
- The main extraction pit has an areaof approx 6000 square metersoverall.
- The height difference between thetop of the building and deepestextracted level is approx 30m.
Cultural Space
Tower Crane
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Crane• JASO J380 Luffing Tower Crane to be
installed within the Building footprint
• Tower to feed all construction workswithin main space from Footings tounderside of Headstocks.
• Scope to include all insitu works prior topre-cast roof stage.
Tower Crane
Cultural SpaceP C t R f St t
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Pre-Cast Roof StructurePre-cast Elements- 20 No. Headstocks 10.8m Long & 50T
- 57 No. Super T’s 30m long 1m Deep- Over 300 + Pre-cast Planks and Slabs
Cultural SpaceMobile Crane – Pre-cast Install
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Mobile Crane Pre cast Install
• 450T Mobile Crane to lift pre-cast
elements from off Ground floorsuspended slab.• Grillage beams to be utilised to transfer
point loads through building columns• Stage 1 – Install Pre-cast Headstocks
and stress to columns.
• Stage 2 – Install Super T’s & Planksfrom Gridline 5 to 15.• Stage 3 - Install 200mm Topping Slab.
Cultural SpaceFuture Fitout and Expansion
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Future Fitout and Expansion
- The building has been designed in such a way that the option of a future fit-
out introducing 2 more floors at RL 8.5 and RL 13 within the main space ispossible.- The 2 levels would add a further 10,000 m2 of usable space to the end
user.- Provisions have been made in the design for the floors and also a northern
lift, this ability would not compromise the PT slabs and walls with the future
required penetrations.
Cultural Space
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Progress to date
– Sandstone Extraction Pit
– Counterfort Wall 95% complete
– Northern ramp wall commenced – Rock pocketing for prop beams
– Footings for columns on Northern Ramp commenced
Cultural Space Northern Approach Structure
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- Northern Approach Rockpocketing underway usingpineapple on Excavator
- FRP of Struts to tiedirectly into the existingrockface for lateral loadsfrom new structure
Safety
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The key high risk construction work activities across the
project include:-• Use of powered mobile plant (people / plant separation)• Remediation of asbestos contaminated fill;• Exposure to respirable crystalline silica dust from sandstone extraction and
processing;
• Work along the foreshore that involves both a risk of drowning and divingworks;• Demolition of existing foreshore cellular structure caissons that are load
bearing;• Excavation works greater than 1.5m (sewer diversion, stormwater and
hydraulics)
• Work at heights with risk of significant falls (counterfort wall and buildingstructures);• Work in a confined space (sewer diversion and service investigation); and• Work adjacent to roadways that is in use by traffic.
Sustainability
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• Use of recycled products including recovered glass sand
and recycled aggregate in drainage• Average 47% of cement substituted for flyash across all
concrete mixes
• FSC certified timber for counterfort wall formwork
• Sandstone blocks extracted on site
• Use of site won fill material
• Redesign of counterfort wall to reduce concrete
• Biodegradable hydraulic oil• 70,000 plants including trees,
shrubs, groundcovers• Use of native and endemic
plant species• Aquatic and terrestrial habitat
creation through design
Environmental
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Remedial Action Plan• material compliance• reuse of on-site materials
Environmental Management
Framework• Air Quality• Soil & Water• Noise & Vibration• Waste• Asbestos
Environmental
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Monitoring
• Dust - real time alerts & review• Odour• Respirable Dust• Asbestos• Water Quality
real time alerts & review for Turbidity
Mitigation Measures• Collection & treatment of site water• Silt curtains• Dust suppression
• Stockpile management
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Thank you
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Questions