11

KCRC WEST RAILKCRC WEST RAILCCCC--300300

TseunTseun Wan Station and Wan Station and Approach TunnelsApproach Tunnels

PentaPenta OceanOcean-- KierKierJoint VentureJoint Venture

22

TseunTseun Wan Station and Approach TunnelsWan Station and Approach Tunnels

•• Contract No. : CCContract No. : CC--300300

•• Client : KCRCClient : KCRC

•• Consultant : Atkins China Ltd.Consultant : Atkins China Ltd.

•• Contractor : Contractor : PentaPenta Ocean Ocean –– Kier Joint VentureKier Joint Venture

•• Contract Period : MarContract Period : Mar--1999 to Nov1999 to Nov--20032003

•• Duration : 4.5 yearsDuration : 4.5 years

•• Contract Sum : 1.7 BillionsContract Sum : 1.7 Billions

33

44

Reclamation Reclamation by CCby CC--302302

55

Presentation: Presentation: Construction Sequences and MethodsConstruction Sequences and Methods

1.1. Tunnel ConstructionTunnel Construction2.2. Box Culvert Construction and DiversionBox Culvert Construction and Diversion

Ma Ma TauTau Pa CulvertPa CulvertTai Hoi CulvertTai Hoi CulvertChung Hang Culvert Chung Hang Culvert

3.3. Station Structure Construction Station Structure Construction

4.4. Difficulties & Problems EncounteredDifficulties & Problems Encountered

66

Southern Transition Tunnel (STT) &Southern Transition Tunnel (STT) &Southern Approach Tunnel (SAT)Southern Approach Tunnel (SAT)

-- ~280m South of Station Connected to BD~280m South of Station Connected to BD--320 (320 (TsingTsing TsuenTsuen Tunnel)Tunnel)-- CutCut--andand--cover Tunnel & Design for Bottomcover Tunnel & Design for Bottom--up Constructionup Construction-- ““Top DownTop Down”” Construction for the Tunnel Underneath Construction for the Tunnel Underneath

Tai Ho Culvert and Ma Tai Ho Culvert and Ma TauTau Pa CulvertPa Culvert-- Max depths of Excavation ~ 22 mMax depths of Excavation ~ 22 m

77

Stage 1Stage 1--Construct Propping Slab for Construct Propping Slab for

supporting Ma supporting Ma TauTau Pa Culvert Pa Culvert --Construct tunnel roof slab for Construct tunnel roof slab for

supporting Tai Ho Culvertsupporting Tai Ho Culvert-- Culvert constructionCulvert construction-- Construct SAT between culvertsConstruct SAT between culverts

Construction Sequences for South TunnelConstruction Sequences for South Tunnel

Stage 2Stage 2Demolish old culvertDemolish old culvertTop down construction at Ma Top down construction at Ma TauTau

Pa and Tai Ho CulvertsPa and Tai Ho CulvertsDivert Wing Shun Street and Divert Wing Shun Street and

commence tunnel constructioncommence tunnel construction

88

North Transition Tunnel (NTT) Northern Approach Tunnel (NATNorth Transition Tunnel (NTT) Northern Approach Tunnel (NAT))-- ~320m North of Station Connected to DB~320m North of Station Connected to DB--350 (Tai Lam Tunnel)350 (Tai Lam Tunnel)-- CutCut--andand--cover Tunnel & Design for Bottomcover Tunnel & Design for Bottom--up Constructionup Construction-- ““Top DownTop Down”” Construction for the Tunnel Underneath Construction for the Tunnel Underneath

-- Chung Hung CulvertChung Hung Culvert-- New Intake Structure New Intake Structure fofo WSDWSD’’s s TsuenTsuen Wan Central Salt Water Wan Central Salt Water

Pumping StationPumping Station-- Diverted Hoi Diverted Hoi HingHing RoadRoad

99

Construction Sequence for North TunnelConstruction Sequence for North Tunnel

Stage 1Stage 1Complete NTT Complete NTT Construct Propping Slab for Construct Propping Slab for HuiHui

HingHing RoadRoadDivert Chung Hang CulvertDivert Chung Hang Culvert

Stage 2 Stage 2

Divert Flow for TWPS Intake and Divert Flow for TWPS Intake and demolish old Intake demolish old Intake

Divert Divert HuiHui HingHing Road and demolish Road and demolish old roadold road

ReRe--provision of Chung Hang Culvertprovision of Chung Hang Culvert

1010

Tunnel Construction: Protection of Existing Utilities Tunnel Construction: Protection of Existing Utilities During Diaphragm Wall ConstructionDuring Diaphragm Wall Construction

Guide wall between utilities

Steel frame for enclosing utilities

1111

Tunnel Construction: Tunnel Construction: Supporting of Existing Utilities before ExcavationSupporting of Existing Utilities before Excavation

1212

•• ffffff

Tunnel Construction: PreTunnel Construction: Pre--LoadingLoading

fff

Pre-Loading at 2nd Layer of Strut

Backing Concrete between Walling and Diaphragm Wall

Struts Hanged on the Brackets

1313

Tunnel Construction: PreTunnel Construction: Pre--LoadingLoading

Set up for Pre-loading

Insert Shim Plates

Release the Loading

1414

Top Down Construction: Strut InstallationTop Down Construction: Strut Installation

1515

Top Down Construction: Top Down Construction: Strut Installation and ExcavationStrut Installation and Excavation

--Stage 1Stage 1Install 1Install 1stst layer strut & prelayer strut & pre--loadingloadingDewater to 1 m below required Dewater to 1 m below required levellevelExcavate to below 2Excavate to below 2ndnd of strutof strut

1616

--Stage 2Stage 2Install of 2Install of 2ndnd layer strut & layer strut & prepre--loadingloadingDewater 1 m below Dewater 1 m below formation levelformation levelExcavate to formation levelExcavate to formation level

1717

Stage 3Stage 3i) Construct Base slab i) Construct Base slab

-- Rebar fixingRebar fixing

1818

Stage 4Stage 4i) Construct Base slab i) Construct Base slab

-- Formwork erection & Formwork erection & concretingconcreting

1919

Stage 5Stage 5--Fill mass concrete between Fill mass concrete between base slab and diaphragmbase slab and diaphragm--Remove struts Remove struts --Construct wall and roof Construct wall and roof slabslab

2020

Stage 6Stage 6-- Backfill the gap between Backfill the gap between

tunnel wall and diaphragm walltunnel wall and diaphragm wall-- Remove strut and backfillingRemove strut and backfilling

Stage 7Stage 7-- Backfilling and removal of strutsBackfilling and removal of struts

2121

2222

2323

2424

Tradition FormworkTradition Formwork

2525

System FormworkSystem Formwork

2626

Collapse of FormworkCollapse of Formwork-- Slump of concreteSlump of concrete-- Pouring rate of concretePouring rate of concrete

11

Ma Ma TauTau Pa Culvert Pa Culvert -- Stage 1 Construction: Stage 1 Construction: -- Construct diaphragm wall and propping slabConstruct diaphragm wall and propping slab-- Construct culvert Bay 8 and Bay 9 over propping slabConstruct culvert Bay 8 and Bay 9 over propping slab-- Divert Wing Shun Street over the culvert (Bay 5 to Bay 11)Divert Wing Shun Street over the culvert (Bay 5 to Bay 11)

Propping Slab & Retaining Wall

Bay 6

Bay 5

Bay 7

Bay 8

Bay 11

Bay 10

Bay 9

*Existing Wing Shun to be diverted after completion

of Bay 5 to Bay 11

*Diaphragm Wall cannot be constructed until

existing culvert has been diverted

Diaphragm WallSlurry wall to -9 mPDact as water cut-off

Stage 2 connectionfor Bay 1 to Bay 4

Bay 4

Bay 3

22

Stage 1:Stage 1:Completion of culvert construction Bay 5 to Bay 11 (Dec 2000)Completion of culvert construction Bay 5 to Bay 11 (Dec 2000)

Bay 10 & 11

Bay 5, 6 & 7

Bay 8 & 9

33

Stage 2:Stage 2:Divert Wing Shun Road over box culvertDivert Wing Shun Road over box culvertDemolish existing culvert for tunnel construction after completDemolish existing culvert for tunnel construction after completion of ion of

culvert diversion and construction (Mar 2001)culvert diversion and construction (Mar 2001)

Propping Slab & Retaining Wall

44

Hacking couplers at DWHacking couplers at DW

Propping Slab

Box Culvert

Tunnel Box to be constructed

by “Top Down” Method

Wing Shun Street

Tie beam between RWover culvert roof slab

Tie beam between RW

55

Water come from theweep pole of RW

Propping Slab

Box culvert (Bay 8 & 9)over propping slab

Tie beam between RWover culvert roof slab

66

Construct Bay 5, 6 & 7 Cut-off wall at Outfall

Propping Slab Construction Construct Bay 5, 6 & 7

77

Second Stage Second Stage Diversion and ConnectionDiversion and Connectionfor Ma for Ma TauTau Pa Box Culvert Pa Box Culvert

Criteria:Criteria:•• 3 Cells3 Cells•• No Blockage at Wet Season (1 Apr No Blockage at Wet Season (1 Apr –– 31 Oct)31 Oct)•• Allow to Block Allow to Block ““One CellOne Cell”” during Dry Season during Dry Season

(1 Nov (1 Nov -- 31 Mar) by DIA Report31 Mar) by DIA Report

Considerations:Considerations:-- ProgrammeProgramme-- Diversion and Connection MethodsDiversion and Connection Methods

(1+1+1 or A+B+C)(1+1+1 or A+B+C)

88

ProgrammeProgramme and Diversion Method Considerationand Diversion Method Consideration

2nd Stage”-Diversion and Connection

for Bay 1 to Bay 4 Programme: Jan 01 – Mar 01 (3 months)

Delay will affect Tunnel Construction

1st Stage- Construction of diaphragm wall,

propping slab and Bay 5 to Bay 8

Programme: Jan 00 - Dec 00 (12 months)Delay will affect Culvert Connection

& Wing Shun StreetDiversion

Bay 11

Bay 10

Bay 9

Bay 8

Bay 7

Bay 6

Bay 5

Bay 4

Bay 3

99

Stage 1Stage 1-- Drive new sheet piles and leftDrive new sheet piles and left--in old sheet piles to form waterin old sheet piles to form water--tight cofferdamtight cofferdam-- Install the strut systemInstall the strut system-- Grout curtain is to be installation underneath box culvertGrout curtain is to be installation underneath box culvert

Cell BCell A Cell C

Sheet pile to be cut

Grout Curtain

1010

Stage 2Stage 2-- Block Cell B, water flow at Cell A and Cell CBlock Cell B, water flow at Cell A and Cell C-- Demolish Cell B roof slab for temporary wall installationDemolish Cell B roof slab for temporary wall installation

Stage 1 Restrain Stage 1 Restrain -- Reaction bock fixed on Reaction bock fixed on

old culvert roof slabold culvert roof slabCell B

Cell A Cell C

1111

Stage 3Stage 3-- Relocation stop gates to Cell A, water flow at Cell B and Cell Relocation stop gates to Cell A, water flow at Cell B and Cell CC-- Install struts and provide stage 1 restraintInstall struts and provide stage 1 restraint-- Demolish Cell A and excavate to Demolish Cell A and excavate to --2.15 2.15 mPDmPD-- Construct New Cell A (B1, B2, B3 & B4) and New Cell B (B4)Construct New Cell A (B1, B2, B3 & B4) and New Cell B (B4)

Cell CCell B

Cell A

1212

Stage 4Stage 4-- Remove the bulkheads at New Cell A at outfallRemove the bulkheads at New Cell A at outfall-- Relocation stop gates to Cell C, so water flow at New Cell A anRelocation stop gates to Cell C, so water flow at New Cell A and Cell Bd Cell B-- Demolish Cell C roof slab for temporary wall installation Demolish Cell C roof slab for temporary wall installation

Cell ACell B Cell C

1313

Stage 5Stage 5-- Relocation stop gates to Cell B, so water flow at New Cell A anRelocation stop gates to Cell B, so water flow at New Cell A and Cell Cd Cell C-- Remove stage 1 restraint and provide stage 2 restraintRemove stage 1 restraint and provide stage 2 restraint-- Demolish Cell BDemolish Cell B-- Excavate to Excavate to --2.5mPD and construct New Cell B 2.5mPD and construct New Cell B

Cell BCell CCell A

1414

Stage 6Stage 6-- Remove bulkheads of Cell B at OutfallRemove bulkheads of Cell B at Outfall-- Relocate stop gates to Cell C, so water flow at New Cell A and Relocate stop gates to Cell C, so water flow at New Cell A and New Cell BNew Cell B-- Demolish Cell CDemolish Cell C-- Excavate to Excavate to --2.5mPD and construct New Cell C2.5mPD and construct New Cell C

Cell BCell CCell A

1515

Tai Ho Culvert Construction:Tai Ho Culvert Construction:Stage 1Stage 1-- Construct diaphragm wall and tunnel roof slab (STT Construct diaphragm wall and tunnel roof slab (STT –– S23 to S27)S23 to S27)-- Construct Culvert Bay 9 and Bay 11 over tunnel roof slabConstruct Culvert Bay 9 and Bay 11 over tunnel roof slabStage 2: Stage 2: Diversion and connectionDiversion and connection

Diaphragm Wall cannot be constructed until

existing culvert has been diverted

Diaphragm Wall

Tunnel Roof Slab

Bulkheads at precast culvert constructed

under CC-350 l

Stage 1

Stage 2 – Diversion & Connection

Bay 12

Bay 10

Bay 6 Bay 3

Bay 2

Bay 1

Bay 9

Bay 8

Bay 7

Bay 5

Bay 4

Bay 11

1616

1717

Tai Ho Culvert and Tunnel Roof Slab (NTT)Tai Ho Culvert and Tunnel Roof Slab (NTT)

Bay 9 & 10Bay 11 & 12

Bay 6, 7 & 8

1818

Stage 1 ConstructionStage 1 Construction

1919

Stage 1 Construction: Stage 1 Construction: Rebar Fixing for Tunnel Roof Slab (NTT)Rebar Fixing for Tunnel Roof Slab (NTT)

2020

Stage 1 Construction: Concreting for Roof SlabStage 1 Construction: Concreting for Roof Slab

2121

TrimmeTrimme concrete to stop water seepageconcrete to stop water seepage-- Timing for concreting?Timing for concreting?-- Thickness of concrete?Thickness of concrete?-- Special technique?Special technique?

2222

Second Stage Second Stage Diversion and ConnectionDiversion and Connection

for Tai Ho Culvert Box Culvertfor Tai Ho Culvert Box Culvert

DIA ReportDIA Report•• Allow to Block Allow to Block ““Two CellsTwo Cells”” during Dry Season during Dry Season

with providing Bywith providing By--pass Channelpass Channel

Considerations:Considerations:-- ProgrammeProgramme-- Diversion and Connection MethodsDiversion and Connection Methods

(2+1+1 or AB+C+D)(2+1+1 or AB+C+D)

2323

Stage 1Stage 1-- Drive new sheet piles and liftDrive new sheet piles and lift--in old sheet piles to form waterin old sheet piles to form water--tight cofferdamtight cofferdam-- Construction of ByConstruction of By--Pass ChannelPass Channel-- Grout curtain is to be installation underneath box culvertGrout curtain is to be installation underneath box culvert

Grout Curtain

By-pass Channel

Sheet pile to be lift-in

A B DC

2424

Tai Ho Culvert Tai Ho Culvert –– Construction of ByConstruction of By--pass Channelpass Channel

2525

Stage 2Stage 2-- Seal up all Balancing Seal up all Balancing

holes between cellsholes between cells-- Demolish part of Demolish part of

wall between cellswall between cells-- Installation stop Installation stop

gates at Cell A & Cgates at Cell A & C-- Flow at Cell B, D Flow at Cell B, D

and byand by--pass channelpass channel-- Install temporary Install temporary

wall at Cell Cwall at Cell C

CBAD

2626

Stage 3Stage 3-- Relocation stop gates Relocation stop gates

from C to Bfrom C to B-- Flow at Cell C, D Flow at Cell C, D

and byand by--pass channel pass channel -- Demolish Cell A and ADemolish Cell A and A-- Dewater and excavateDewater and excavate-- Construct Construct

Cell A (B1Cell A (B1--B3), B3), Cell B (B1Cell B (B1-- B4), B4), Cell C (B4) and Cell C (B4) and Cell D (B5) Cell D (B5)

A B C D

2727

Stage 4Stage 4-- Demolish bulkheads Demolish bulkheads

of Cell A and B at of Cell A and B at outfall outfall

-- Relocation stop gates Relocation stop gates to from A, B to C, Dto from A, B to C, D

-- Flow at Cell New Flow at Cell New Cell A, B and byCell A, B and by--pass pass channel channel

-- Demolish Cell C and DDemolish Cell C and D-- Dewater and excavateDewater and excavate-- ConstructConstruct

Cell C (B1Cell C (B1--B3)B3)

DCBA

2828

Construction of Cell C: (Dec 2000)Construction of Cell C: (Dec 2000)

Cell C

Cell D

2929

Completion of Cell C Completion of Cell C –– Flow to Cell A, B & C (Jan 2001)Flow to Cell A, B & C (Jan 2001)

C

Cell C Cell B Cell A

Cell D

By-pass channel

3030

Stage 5Stage 5-- Demolish bulkhead of Demolish bulkhead of Cell C at outfallCell C at outfall-- Relocation stop gates Relocation stop gates

to to Dto to D-- Divert flow at New Divert flow at New

Cell A, B and C Cell A, B and C -- Demolish Cell D Demolish Cell D -- Dewater and Dewater and

excavateexcavate-- Construct Construct

Cell D (B1Cell D (B1--B4)B4)

*Demolish old culvert *Demolish old culvert for diaphragm wall for diaphragm wall construction*construction*

B C DA

3131

Construct Cell D & Demolish of Existing Culvert (Feb 2001)Construct Cell D & Demolish of Existing Culvert (Feb 2001)

Cell A

Cell B

Cell C

Cell D

3232

Completion of Cell D & Commencement of DW Construction Completion of Cell D & Commencement of DW Construction (Mar 2001)(Mar 2001)

3333

Completion of Diaphragm & Commencement of Excavation Completion of Diaphragm & Commencement of Excavation (May 2001)(May 2001)

3434

Strut Installation and Excavation (June 2001)Strut Installation and Excavation (June 2001)

3535

Box Culvert Construction Box Culvert Construction for 8for 8--Cells Cheung Hang CulvertCells Cheung Hang Culvert

DIA ReportDIA Report

Wet SeasonWet Season•• Allow to Block Allow to Block ““Two CellsTwo Cells”” with providing Bywith providing By--pass pass

Channel (either 12m or 10m)Channel (either 12m or 10m)

Dry SeasonDry Season•• Allow to Block Allow to Block ““Four CellsFour Cells””

3636

Construction of Diaphragm WallConstruction of Diaphragm Wall

S1 – S4 N1 – N4

3737

ByBy--pass channelpass channel

3838

Block Cell N1 Block Cell N1 –– N4, Flow at Cell S1 N4, Flow at Cell S1 –– S4S4

3939

Construction Sequences for Propping SlabConstruction Sequences for Propping Slab

1) Demolish of Culvert 1) Demolish of Culvert 2) Excavate and expose coupler at DW2) Excavate and expose coupler at DW

4) Reinstate the culvert4) Reinstate the culvert3) Steel fixing for Propping Slab3) Steel fixing for Propping Slab

4040

Block N3 & N4, flow N1, N1 & S1 Block N3 & N4, flow N1, N1 & S1 –– S1S1

4141

Reinstate the Demolished CellsReinstate the Demolished Cells

4242

Stop Gates DesignStop Gates Design

11

•• TseunTseun Wan StationWan StationSize: 40 m (W) x 400 m (L) x 20 m (D)Size: 40 m (W) x 400 m (L) x 20 m (D)Three Tracks & Underground Two Level (Platform Level and ConcourThree Tracks & Underground Two Level (Platform Level and Concourse se Level)Level)Two Level Superstructure Accommodating Passenger Circulation andTwo Level Superstructure Accommodating Passenger Circulation andPlants RoomsPlants RoomsFoundation comprise Large Foundation comprise Large DiametreDiametre Bored Piles, HBored Piles, H--Pile & Diaphragm Pile & Diaphragm Wall acts as Permanent External Station Wall & Provide TemporaryWall acts as Permanent External Station Wall & Provide TemporaryExcavation SupportExcavation Support

22

Strut Layout Plan and SectionStrut Layout Plan and Section

33

Station Station –– Strut Installation Method & Sequence 1Strut Installation Method & Sequence 1

PrePre--installation installation •• Carry Pumping TestCarry Pumping Test•• Recharge the water to original Recharge the water to original

levellevelStage 1Stage 1•• Dewater to Dewater to ––0.5mPD0.5mPD•• Excavate to 0.5mPDExcavate to 0.5mPD•• Install 1Install 1stst of Strutsof Struts•• Preloading of the strutsPreloading of the struts

44

Stage 2Stage 2•• Dewater to Dewater to ––9.5mPD9.5mPD•• Excavate to Excavate to ––8.5mPD8.5mPD

Station Station –– Strut Installation Method & Sequence 2Strut Installation Method & Sequence 2

55

Stage 3Stage 3GL46 GL46 -- GL50GL50•• Preloading 2Preloading 2ndnd of Strutsof Struts•• Dewater & continue excavationDewater & continue excavation

Station Station –– Strut Installation Method & SequenceStrut Installation Method & Sequence

66

Station Station –– Strut Installation Method & SequenceStrut Installation Method & Sequence

Stage 4Stage 4•• Dewater 1 m below formation Dewater 1 m below formation

level (~12.5mPD)level (~12.5mPD)•• Excavate to formation levelExcavate to formation level•• Construct Truck SlabConstruct Truck Slab•• After completion of Pumping Test After completion of Pumping Test

in adjacent NTT, remove slurry in adjacent NTT, remove slurry wall.wall.

77

Strutting System for StationStrutting System for Station

1) Construct Truck Slab at Platform Level

2) Remove 2nd

layer strut

3) Construct Concourse Slab

88

Construction of Slab Concourse LevelConstruction of Slab Concourse Level

99

Remove 1Remove 1stst Struts after Casting of Concourse SlabStruts after Casting of Concourse Slab

1010

Construction of G/F SlabConstruction of G/F Slab

Capping Beam for G/F Slab

1111

December 00 (M0)December 00 (M0)

1212

Mar 01 (M3)Mar 01 (M3)

1313

June 01 (M6)June 01 (M6)

1414

Aug 01 (M8)Aug 01 (M8)

1515

Dec 01 (M12)Dec 01 (M12)

1616

Dec 01 (M12)Dec 01 (M12)

1717

Mar 02 (M15)Mar 02 (M15)

1818

June 02 (M18)June 02 (M18)

1919

September 02 (M21)September 02 (M21)

2020

December 02 (M24)December 02 (M24)

2121

Mar 03 (M 27)Mar 03 (M 27)

2222

June 03 (M30)June 03 (M30)

2323

September 03 (M33)September 03 (M33)

2424

Nov 03 (M35)Nov 03 (M35)

2525

Nov 03 (M35)Nov 03 (M35)

2626

ABWFABWF

2727

ABWF ABWF