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LNG in-ground tank. March 6 th , 2006 Kajima Corporation. LNG in-ground tank: Kajima's construction experience. - From 1976, delivered LNG in-ground tanks of various capacity from 650 kl to 200,000 kl - 26 LNG in-ground tanks in Japan with combined capacity of 2,370,000 kl.

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slide1

LNG in-ground tank

March 6th, 2006

Kajima Corporation

lng in ground tank kajima s construction experience
LNG in-ground tank: Kajima's construction experience
  • - From 1976, delivered LNG in-ground tanks of various capacity from 650 kl to 200,000 kl
  • - 26 LNG in-ground tanks in Japan with combined capacity of 2,370,000 kl
structure of lng in ground tank
Structure of LNG in-ground tank

Concrete roof

Banking

  • Steel roof / Insulation

Side heater

Membrane

Insulation

Concrete segment

Side wall

Diaphragm wall

Gravel layer

Bottom heater

Bottom slab

slide4

Concrete roof

Diaphragm wall

Membrane

slide5

Side heater

Bottom heater

Concrete segment

Insulation

embedded tank
Embedded tank

Banking

  • - Harmonious with the ambient environment
  • - Highly reliable and safe
  • - Multipurpose uses of the ground above the banking
bottom slab structure
Bottom slab structure

Bottom slab

(pressure-reducing slab)

Pressure-reducing slab can be applied to the ground

where the water seepage is anticipated to be small.

earth retaining structure
Earth retaining structure

Vertical NATM

Earth retaining structure by vertical NATM can be applied

to the self-supporting ground where the water seepage

is anticipated to be small.

cryogenic test for concrete structure
Cryogenic test for concrete structure

Determining low temperature characteristics of material

  • Low temperature bending test
  • of RC beam

Low temperature tensile test

of reinforcing bar

test for frozen soil
Test for frozen soil

Determining mechanical properties

and expansion pressure of frozen soil

Test for frozen soil

by using 3-dimensional model

Test for frozen soil

by using 2-dimensional model

estimation of strength for rc roof
Estimation of strength for RC roof

Estimation of strength for RC roof including bucking analysis considering non-linearity of material and shape

earthquake observation and analysis
Earthquake observation and analysis

Determining seismic behaviour based on the analysis from various perspectives, by using a wealth of observation data

Wave patterns of the acceleration

of the ground and the tank

air support construction method
Air support construction method

2. Assembly of

steel roof

3. Air lifting

4. Installation of

steel roof

  • 1. Construction of
  • side wall

5. Air support construction

(concrete placing)

6. Completed

high performance concrete supercrete
High performance concrete "Supercrete"

Cost reduction due to development of Supercrete, a high performance concrete with compressive strength of 80 N/mm2

Verification test of supercrete

Supercrete slurry wall

excavation machine for thinner diaphragm wall
Excavation machine for thinner diaphragm wall

Better construction environment and less loosening problems of the natural ground, compared with conventional spraying method

Excavation machine for thinner diaphragm wall and finished concrete wall

self elevating scaffolding
Self-elevating scaffolding

Self-elevating scaffolding can be used for the construction of the structure, such as assembly of concrete segment for side wall, erection of reinforcing bars, installation of outer forms and so forth.

Self-elevating scaffolding

Assembly of concrete segment using self-elevating scaffolding

machine for assemblage and erection of reinforcing bars
Machine for assemblage and erectionof reinforcing bars

Assemblage, transportation and installation of reinforcing bars can be done collectively in the working yard.

Erection of assembled reinforcing bars

all weather type rapid construction method
All weather type rapid construction method

Roof is assembled, prior to construction of side wall.

After that, insulation and membrane are installed concurrently with construction of side wall.

→ Shortening of construction period (Rapid construction)

in ground type aboveground type pc metal
In-ground type + Aboveground type (PC, metal)

Composite structure of conventional in-ground tank and PC (metal) aboveground tank

(Aboveground tank is built on the top of side wall of in-ground tank. )

steel concrete roof type
Steel + Concrete roof type

RC roof is built around the outer perimeter of steel roof, to the enlarge inner diameter of the tank

→Large-sized tank as much as 100m in diameter

automated pneumatic caisson method
Automated pneumatic caisson method

LNG in-ground tank can be built without earth retaining wall and cut-off wall.

type of lng tank
Type of LNG tank

Single containment tank

Elevated base

slide31

Double containment tank

Reinforced concrete outer tank wall

Earth embankment

slide32

Pit-in (double containment) tank

Reinforced concrete pit

Elevated base

slide33

Double containment tank

Prestressed concrete outer tank wall

slide34

Full containment tank

Reinforced concrete roof

Prestressed concrete outer tank wall

construction procedure
Construction procedure

1. Foundation work

2. Base slab and PC outer tank wall

- Soil improvement

- Pile foundation

PC outer tank wall

Base slab

Bottom heater

slide36

Lift up

Assembly of roof

PC outer tank wall

Bottom of inner tank,

Bottom insulation

Side of inner tank

Liner for the

outer shell bottom

Liner for the outer shell

Bottom PUF panel

3. PC outer tank wall

4. Mechanical work

Mechanical work:

- Liner for the outer shell bottom

- Assembly of inner & outer roof

- Lifting up the roof

- Liner for the side of outer shell

- Bottom insulation

- Bottom and side of inner tank

slide37

Water pressure test

Pressure test

Pneumatic test

Prestressing

PUF panel for side wall

5. PC outer tank wall

6. Mechanical work

- Close the opening

- Prestressing

- Water pressure test

- Pressure test

- Pneumatic test

PUF panel for side wall

slide38

Side of inner shell

Side insulation

PUF panel

Side of outer shell liner

7. Mechanical work

8. Mechanical work

- Side and roof insulation

- Tests & cooling down

Start of the operation

bottom heater
Bottom heater

Trombone shape type

  • Conventional type

Kajima type

puf panel
PUF panel

PUF cap

  • Stud bolt

PC structure

Surface material

(in-situ installation)

Liner plate

PUF

(in-situ injection & foam)

PUF panel

construction experience
Construction experience
  • Petrochemical complex
  • in Oita, Japan