TD Construction in Indo - davysukamta.comdavysukamta.com/media/6190/td_construction_in_indo__compatibility... · TAHAP 1 Construction of Secant Pile, Bored-Pile and Kingpost. 11/12/2014

11/12/2014

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DAVYSUKAMTA & PARTNERS, Structural Engineers

Principal, DS&P


http://www.davysukamta.com

TERIMA KASIHTERIMA KASIHTERIMA KASIHTERIMA KASIH

News / Articles


Jakarta, the Capital of Indonesia


Complex Basement Construction in Very Congested Urban Environtment


Complex Basement Construction in Very Congested Urban Environtment


DEEP BASEMENT IN DENSE URBAN CONDITION

Design Consideration:

- Depth of Excavation- Type of Soil- Water Table- Adjacent Structure / Site Constraints- Sequence of Works- Excavation Methodology- Construction Details


SUPPORT

GROUND ANCHOR

STRUT : Steel or RC slab (top down)


� Top-Down Construction

� Semi Top-Down Construction

TDC enables the superstructureand the underground structureto be built simultaneously

Semi TDC makes use of thestiff RC slab as struts, startingthe construction from theground to the bottom

Use of RC Slab as Struts


Use of RC slab as strut gives the required

rigid support for the diaphragm wall

Work progressed simultaneously for the

basement and the super-structure, saving

construction time

Design MUST reflect the actual sequence of

work. DETAILING is tedious and complex

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Construction Method

Load Path

Strutting

System

Choice ofKing-Post

Sequence of Work

Top-Down Construction


The Key Component


Where to install the 1st slab

Installing the KingpostCasting Concrete under the Slab

Connect RC Slab to KingpostSteel Rebar Passing Through Kingpost

Soil Removal: Skip Floor or Not? Construction Holes?

LL for Working Platform Depends onEquipment And Method of Work


Soil Removal


Soil Removal


� 5-level basement� Dense urban location� Wisma Metropolitan 1 +

WTC-2 + Mosque are close to the basement

� Depth of excavation 16 M� Semi Top-Down

Construction


WTC-2

Mosque

WM-1


Basement is located very close to adjacent WTC-2,

Wisma Metropolitan 1, Mosque and future WTC-4.

Excavation reached 15.8 meters

Deformation of the retaining structure must be

minimized to avoid damaging adjacent structures

Limited access and space for work

Not possible to install ground anchors

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115 piles φ1500mm with kingpost

Bored-piles φ1200 mm without kingpost

WTC-2

WM-1

DAVYSUKAMTA & PARTNERS, Structural Engineers DAVYSUKAMTA & PARTNERS, Structural Engineers

DAVYSUKAMTA & PARTNERS, Structural Engineers DAVYSUKAMTA & PARTNERS, Structural Engineers DAVYSUKAMTA & PARTNERS, Structural Engineers


Struttingthe Hole


Temporary Ramp for Construction


Stress S22 Diagram: Effect of soil pressure and openings on RC slab

Check the Stress in the SlabDue to Soil Pressure andConstruction Opening

COMPRESSION TENSION

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The Details

Use of CAD/CAMto help the Design Process


Connection Detail:Kingpost to Slab



Welding Quality Inspection

Shear Stud Quality Assurance


Work on Progress:Preparation Work for B-1 Slab

(Working Platform)



Case Study No.2: Plaza Indonesia Extension48-story + 5-level basement, 220,000 sq.m, completed in 2009


ProjectLocation


Basement is located very close to adjacent Grand

Hyatt hotel, e-X center and Japanese Embassy, and

excavation reached 17 meters

High water table, 1.5 – 2.0 meters below the surface

Deformation of the retaining structure must be

minimized to avoid damaging adjacent structures

Limited Construction time and space for work

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Top-Down Construction-Use RC slab as strut-Work simultaneously

upwards and downwards

The Ground floor was designedfor LL = 2000kg/sq.m (20kPa)

to take construction load


Use of RC slab as strut gives the required

rigid support for the diaphragm wall

Work progressed simultaneously for the

basement and the super-structure, saving

11 month’s construction time

On completion of B-5 level, work onsuperstructure had reached level-11



Use of metal formwork for precision and speed of construction


Holes for steel rebar


Use of weldable couplerDye Penetrant Testto Check Weld Quality

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Foundation of Tower Crane


Pipes for concrete casting



Analysis and design of D-wall, king-postsand supporting bored-piles

must follow construction sequence

High capacity king-post and bored pileis required to take the construction load

before the RC mat is poured andsteel king-post encased in concrete


Horizontal Deflection

-35

-30

-25

-20

-15

-10

-5

0

-20 0 20 40 60

Horizontal Deflection (mm)

Dep

th (

m)

Excav. To 3.7m (EL. -0.35m)

B1 and Excav. To 6.7m (-3.35m)

Bending Moment

-35

-30

-25

-20

-15

-10

-5

0

-100 -50 0 50 100

Bending Moment (ton.m/m)

Dep

th (

m)



Shear Force

-35

-30

-25

-20

-15

-10

-5

0

-50 -25 0 25 50

Shear Force (ton/m)

Dep

th (

m)




Horizontal Deflection

-35

-30

-25

-20

-15

-10

-5

0

-20 0 20 40 60

Horizontal Deflection (mm)

Dep

th (

m)

Excav. To 15.85m (-12.5m)

Mat (t=2.5m)

Bending Moment

-35

-30

-25

-20

-15

-10

-5

0

-100 -50 0 50 100

Bending Moment (ton.m/m)

Dep

th (

m)

Excav. To 15.85m (-12.5m)

Mat (t=2.5m)

Shear Force

-35

-30

-25

-20

-15

-10

-5

0

-50 -25 0 25 50

Shear Force (ton/m)

Dep

th (

m)

Excav. To 15.85m (-12.5m)

Mat (t=2.5m)


"A"-side : Adjacent to Existing Plaza Indonesia (Without Temporary Strut)

-35

-30

-25

-20

-15

-10

-5

0

-80 -60 -40 -20 0 20 40 60 80

D-Wall Bending Moment (ton.m/m )

Dep

th (

m)






Excav. To 15.85m (-12.5m)

Mat (t=2.5m)

GWL Recovery

Bending MomentMin ≅≅≅≅ -63.5 ton.m/mMax ≅≅≅≅ 64.0 ton.m/m

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Site Condition – Oct.2006


Adjacent to Existing Plaza Indonesia[Excavation depth = 16m]

-35

-30

-25

-20

-15

-10

-5

0

-80 -60 -40 -20 0 20 40 60 80

Envelope of D-Wall Bending Moment (ton.m/m)

Dep

th (

m)

Adjacent to Exist. Plz. Indo.

1st Step

Final Step

-35

-30

-25

-20

-15

-10

-5

0

0 10 20 30 40 50

D-Wall Horz. Deflection (mm)

Dep

th (

m)


Adjacent to Jln. Thamrin[Excavation Depth = 14.5m]

-35

-30

-25

-20

-15

-10

-5

0

-80 -60 -40 -20 0 20 40 60 80

Envelope of D-Wall Bending Moment (ton.m/m)

Dep

th (

m)

Adjacent to Jln. Thamrin

1st Step

Final Step

-35

-30

-25

-20

-15

-10

-5

0

0 10 20 30 40 50

D-Wall Horz. Deflection (mm)

Dep

th (

m)


IA-1 IB-3


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Jan2008


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Case Study No.3MENARA BANK MEGAJAKARTA

26-story, 4-level basement

Semi Top-Down Construction

Skip-floor method

Completed in 2006

Installation of King-PostTAHAP 1

Construction of Secant Pile,Bored-Pile and Kingpost

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Use Level B-1 as Working Platform TAHAP 2

Construction of Level B-1/Working Platform

TAHAP 3

Excavation to B-3 Level:Skip Floor Method

Excavation under B-1 Slab

Work on Level B-3

Starter Bars

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Steel Ramp for Access

Struttingthe Hole

TAHAP 4

Completion of B-4 level

Excavation Work Under BExcavation Work Under BExcavation Work Under BExcavation Work Under B----3 Slab3 Slab3 Slab3 Slab

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Galian Tanah P3Galian Tanah P3Galian Tanah P3Galian Tanah P3 Galian Tanah P3 dan Opening LG+P2

Use of Chemical Anchors as DowelsTransfer of Force by Shear-Friction

Preparation for mat Foundation

Casting of mat foundation + 3240 m3 in 36 hours

TAHAP 5

Constructing the B-2 Level:Inserting the RC Slab

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Constructing the B-2 Slab

Use of Chemical Anchors as DowelsTransfer of Force by Shear-Friction

Soil Excavation Under LG (B-1)

= 16,000 m3

Completed in 76 Days

Main Issue: Exercise care for Kingpost

Excavation LG-P2

(B-1 to B-3) = 25,200 m3


Excavation P2-P3 (B-3 s/d

B-4) dan Mat Foundation

Final Work by Manual

Excavation


Completed Project, 2006

Documents

TD Construction in Indo - davysukamta.comdavysukamta.com/media/6190/td_construction_in_indo__compatibility... · TAHAP 1 Construction of Secant Pile, Bored-Pile and Kingpost. 11/12/2014