2013-08 Barangaroo Headland Park Ea Presentation Rev00

8/16/2019 2013-08 Barangaroo Headland Park Ea Presentation Rev00

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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


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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

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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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Retaining Walls around Cultural Space


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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



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• 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




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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




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Shale Band Sandstone Footing Base Shear Key


Counterfort Retaining wall



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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




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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




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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




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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%




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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




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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


Counterfort Retaining wall

C lt ral Space Retaining Walls


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Plaxis 3D Model

Assessed Vertical Soil Stress Assessed Lateral Soil Stress




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Buttresses

Sill beam

Top of baseslab


Behaviour of front wall



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Southern Retaining Wall



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Northern Access Road Retaining Wall



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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



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Northern Access Road Retaining Wall

Terraced Retaining Walls


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Terraced RW

Foreshore area




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Conforming Design

Tender Design



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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



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Magnumstone RSW



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Global Stability in Slope-W

Northern Cove Retaining Walls


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Precast L-shaped retaining walls



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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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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



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Detailed design



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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.




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Final design



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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



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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

2013-08 Barangaroo Headland Park Ea Presentation Rev00

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