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Construction of the International Finance Centre, Phase II

Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

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Page 1: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Construction of the

International Finance Centre, Phase II

Page 2: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

This seminar will cover the following areas regarding the construction of the IFC II

1. Background of the project

2. Foundation system

3. Construction of the 88-storey tower block

4. Construction of the podium structure

5. Basement construction

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Some Background Information about IFC II

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Page 5: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

LANDSCAPE DECK LAYOUTLayout of the overall International Finance Centre

Development and its Neighbourhood

Page 6: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

The project can be dated back to 1996, by the time the foundation work was awarded to Aoki Corporation, the main contractor for the construction of the MTR Hong Kong Station, as part of the overall Station’s contract.

The contract originally included the carrying out of the foundation works for a 88-storey office tower, on which:

• 72 bored piles of size 3m diameter were to be constructed,• the cut-off system using diaphragm walls around the entire site, • bored piles for the podium structure and • barrettes for a hotel building at the west end of the site.

Page 7: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

However, due to economical reasons after 1997, the project had been suspended for a short while. The project resumed in early 2000 upon the finalizing of a supplementary agreement on the revised amount of land premium with the Government.

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March 2000

May 2000

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July 2000

October 2000

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February 2001May 2001

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Foundation System

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As an alternative design, the Aoki team proposed the concept of building a 61.5m internal diameter cofferdam, lined with 1.5m thick diaphragm wall panels, to facilitate the excavation and construction of a raft foundation founded on bedrock for the entire office tower.

Majority of the diaphragm wall panels were excavated by the hydrofraise, or the reverse circulation trench cutting machine. Average depth of the panels was about 55m, with the toe grouted and installed with shear pins to ensure their stability.

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As the excavation proceeded, a capping beam at the top of the cofferdam and 3 ring beams were provided as stiffening elements to the diaphragm wall panels. The excavation extended down to the bedrock, averaged about 40m from the ground level.

The initial excavation was relatively straightforward for merely cutting through reclaimed sand filling layers. However, the later stage of excavation was much difficult and time consuming for it involved the cutting into partially and slightly decomposed granite layers. The whole excavation process down to the formation level at –32mPD, took about 12 month to complete.

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Immediate from the top of the formation surface, a 6.5m-deep heavily reinforced slab served as the raftfor the entire building tower, with a volume of about 17,000 cu metres of concrete, was constructed. Starter provision for the core wall and gusseted base for the installation of the mega-columns were also provided here to receive the construction of the upper structures.

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Forming the 62m dia cofferdam

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Excavation within the cofferdam shaft

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Final stage of reclamation and general foundation to the Hong Kong Station and IFC Phase I & II (1995)

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General foundation to the Hong Kong Station and IFC Phase I & II (1996)

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Start constructing the 62m cofferdam shaft in early 1997. However, works soon suspended in late 1997 due to other reasons

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Overview of the Central Reclamation with the Hong Kong and IFC developments

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Construction of the 88-storey Tower Block

Page 22: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Areas to be highlighted• Construction of the core wall within the 62m

cofferdam

• The mega columns

• Using the Climb Form to construct the core wall

• Construction of the outrigger system on 6-7/F

• Construction of the outrigger system on 32/F

• Construction of the building frame

• Forming the mega column using the Climb Form

• General Fitting out

Page 23: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

a) Construction of the core wall within the 62m cofferdam

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Construction of the core wall inside the cofferdam as seen in July 2000

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Construction of the core wall inside the cofferdam as seen in August 2000

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Construction of the core wall inside the cofferdam as seen in October 2000

Page 27: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Forming the slab around the core wall inside the cofferdam shaft

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b) The mega columns

Page 29: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Cycle 2 (29-07-00)

Cycle 1 (20-07-00)

Cycle 3 (09-07-00)

(17-07-00) - C3(13-07-00) - C2

(27-07-00) - C1

B5

B4

B3

B3M

B2

B1

LG G

1/F

2/F

4/F

6/F

3/F

Cycle 1 (26-06-00)

Cycle 2 (30-06-00)

(06-07-00) - C1

Pour 2 (16-04-00)

(03-06-00)

Pour 1 (30-04-00)

Raft Foundation Completed on 25-03-2000

All Mega Column Plinth Completed on 14-06-2000

Page 30: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

The plinth and the base plate for the mega column

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Erection of the column from the base

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c) Using the Climb Form to construct the core wall

Page 33: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Erecting the Climb Form from the Ground level as seen in February 2001

Page 34: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Operation of the Climb Form from the Ground level to the 1/F as seen in March 2001

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Formwork detail as seen from an elevated position

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General Formwork layout showing the various shaft positions

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Formwork operation detail as seen on the deck

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Formwork operation detail – the external and internal jack systems

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Inside structure inside the core wall to be formed using in-situ method by the using of timber form and aluminium form

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Detail formwork arrangement to form the interior wall and slab inside the core wall

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d) Construction of the outrigger system on 6-7/F

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Page 43: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Detail of a typical set of belt truss and joist-type outrigger located on the 6/F to 7/F

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Detail of the completed outrigger system on 6/F and the building frame on top

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e) Construction of the outrigger system on 32/F

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Junction detail of the column head and the outrigger bearing-support

Deck on 32/F before the erection of the outrigger

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Gradual extending of the belt truss and outrigger

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Column head junction with the bearing-support in position

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The anchor framing embedded into the core wall

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Gradual completion of the outrigger systems

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Anchor frame before embedding with outer layer of reinforced concrete

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Embedment of the anchor frame concrete on the core wall soon to complete

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The completed outrigger and belt truss system on 32/F

Page 54: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

The bearing support of the outrigger and the column articulation detail

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Compare similar systems used in Cheung Kong Center

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Outrigger in Cheung Kong Center

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f) Construction of the building frame

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Erection of the floor beams to form the building frame

Page 59: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Connecting shear stud to the floor beams to provide bonding between beams and RC slab

Forming the composite slab

Page 60: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

g) Forming the Mega Columns using the Climb Form

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Junction detail of the mega column and the slab

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Erection of the Climb Form specially designed for the forming of the composite column

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The column form in a closed position

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The column form in an opened position ready for lifting

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Compare the composite column with Cheung Kong Center

Page 66: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

h) General Fitting-out

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Fitting out work in the lift lobby at the centre of the core wall

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Forming services cubicles using the hardy wall system

Page 70: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Forming the stairs using in-situ and modulated methods

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Detail of the modulated stair system and the in-situ method to cast the landing platform

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Basement Construction

Page 73: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Areas to be highlighted• The ground slab as the separating plate

• The excavation process

• Constructing the basement structure

• The forming of the vehicular ramp

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The ground slab as the separating plate

Forming the ground floor slab as the first separating plate before the top-down excavation process

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Forming the remaining portion of the ground slab after a suspension of about 2 years as seen in early 2000

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The excavation process

Muck opening provided on the ground slab for the removal of spoil

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Excavation inside the basement

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Excavation down to the formation level with pile head exposed

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The use of a material hoist for the removal of spoil from the basement interior

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Constructing the basement structure

Construct the basement in a “double Bit” manner

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Forming the basement slab and encasing the stanchion to form the column

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Basement structure around the muck opening soon to complete, slab will be reinstated afterward

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The forming of the vehicular ramp

The shaft lined by diaphragm wall forming the vehicular ramp into the basement carpark. The ramp serves also as an dump access during the basement excavation process

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Forming the circular ramp

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Completing the ramp for temporary spoil removal purposes

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Construction of the Podium

Page 87: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

Approximate phasing sequence in constructing the podium

E.J.To be completed

on 26-03-01

To be completed on 13-04-01

To be completed on 18-03-01

To be completed on 09-03-01

To be completed on 04-04-01

E.J.

18

7 6 54

To be completed on 16-01-01

To be completed on 02-03-01

To be completed on 06-05-01

39

2

PODIUM LEVEL 1Legend:

A-Frame

4

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Commencement of the podium structure starting from the Ground slab at + 5.6m

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Overview of the podium structure

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Formwork detail in the construction of the podium

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Podium structure joining to the Tower Block

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Layout of the landscaping roof

Page 93: Construction of the International Finance Centre, Phase IIbst1.cityu.edu.hk/e-learning/building_info_pack... ·  · 2009-03-05• Construction of the outrigger system on 32/F

One of the 3 glazed roof features on the roof garden