phương án thi công hầm thủ thiêm

OUTLINE OF THE SAIGON RIVER CROSSING TUNNEL 1.. OUTLINE OF THE SAIGON RIVER CROSSING TUNNEL 2.CONSTRUCTION OF IMMERSED TUNNEL 2-1Casting Basin 2-2Construction of Immersed Tunnel Units

SAIGON EAST

JAPAN

Official Development Assistance

SOCIALIST REPUBLIC OF VIETNAM

HO CHI MINH CITY PEOPLE’S COMMITTEE

SOCIALIST REPUBLIC OF VIETNAM

HO CHI MINH CITY PEOPLE’S COMMITTEE

1 OUTLINE OF THE SAIGON RIVER CROSSING TUNNEL

1 OUTLINE OF THE SAIGON RIVER CROSSING TUNNEL

2.CONSTRUCTION OF IMMERSED TUNNEL

2-1Casting Basin

2-2Construction of Immersed Tunnel Units

2-3Dredging, Towing and Immersion

1 OUTLINE OF THE SAIGON RIVER CROSSING TUNNEL

PLAN & PROFILE OF THU THIEM TUNNEL

SOIL STRATA ALONG THE TUNNEL ALIGNMENT

CROSS SECTION OF IMMERSED TUNNELcauduongonl

ine (c

om.vn,c

om,ne

t,org)

Cross section of Cut & Cover tunnel and Approachescauduongonl

ine (c

om.vn,c

om,ne

t,org)

2 CONSTRUCTION OF IMMERSED TUNNEL

Construction Procedure

Towing Outfitting Fabrication of Units

CASTING BASIN

Casting Basin Construction

Inner work Back filling Immersion

Trench Dredging CONSTRUCTION SITE

LOCATION OF CONSTRUCTION SITE

General View of the Casting Basin

Cross Section of the Casting Basin

The Typical Case of Casting Basin

2-2Construction of Immersed Tunnel Units

Image of the Tunnel

Units Fabrication in

the Casting Basin

OR SHIP YARD CASTING BASIN

IMMERSED TUNNEL UNIT

Unit Fabrication Construction Sequence

End Steel Shell

Casting Basin Foundation

End Steel Shell

Typical Case of Fabrication Tunnel Units

Fabrication Steel Shell

Fabrication Tunnel Units

2-3 Dredging, Towing and Immersion

Trench Dredging and Foundation

Image of Immersion

Towing the submerging unit up to around 10m distance

from previous submerged unit.

Barge for Immersion

Submerging Unit Submerged

Unit

10m

Barge for Immersion

Bearing Jack Temporary support Alignment Tower

Keeping10m distance from previous submerged unit, Unit

is submerged vertically.

Submerging Unit Submerged

Temporary support

Alignment Tower Barge for Immersion

Stop Submerging when depth of bottom of Unit is almost

same as depth of top of previous submerged unit

Submerging Unit Submerged

Temporary support

Alignment Tower Barge for Immersion

Submerging unit is pulled toward to previous submerged unit cauduongonl

ine (c

om.vn,c

om,ne

t,org)

Image of Unit Connection

Pulling the unit by jacks on the top slab Rubber gasket starts to be compressed Both side water presser are balanced.

Draining water between bulkheads

Rubber gasket is compressed more by the water pressure Unit is pushed by difference of both side water pressure.

Completion of draining water

Rubber gasket is fully compressed and be watertightcauduongonl

ine (c

om.vn,c

om,ne

t,org)

Image of Sand Flow Work

TEMPORARY SUPPORT PAD

Image of

Backfilling

Work

(GRADED GRAVEL 100-200KG/PIECE)

LOCKING BACK FILL SAND JETTED FOUNDATION

GENERAL BACK FILL PROTECTIVE CONCRETE

-14.50

1 : 2

APPROX EXISTING RIVER BED LEVEL

COMPLETION OF IMMERSED TUNNEL

TRAFFIC INSIDE THE IMMERSED TUNNEL