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LNG in-ground tank

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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LNG in-ground tank

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  1. LNG in-ground tank March 6th, 2006 Kajima Corporation

  2. 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

  3. 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

  4. Concrete roof Diaphragm wall Membrane

  5. Side heater Bottom heater Concrete segment Insulation

  6. Embedded tank Banking • - Harmonious with the ambient environment • - Highly reliable and safe • - Multipurpose uses of the ground above the banking

  7. 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.

  8. 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.

  9. 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

  10. 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

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

  12. 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

  13. Automatized reinforcing bars distributing robot

  14. 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

  15. 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

  16. 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

  17. 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

  18. 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

  19. 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)

  20. 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. )

  21. 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

  22. Automated pneumatic caisson method LNG in-ground tank can be built without earth retaining wall and cut-off wall.

  23. Comparison of structures for the next large-sized tank

  24. Case 1 (Rigid connection type: 200,000 kl)

  25. Case 2 (250,000 kl tank)

  26. Case 3 (300,000 kl tank)

  27. Case 4 (Semi in-ground tank: 250,000 kl)

  28. LNG aboveground tank

  29. Type of LNG tank Single containment tank Elevated base

  30. Double containment tank Reinforced concrete outer tank wall Earth embankment

  31. Pit-in (double containment) tank Reinforced concrete pit Elevated base

  32. Double containment tank Prestressed concrete outer tank wall

  33. Full containment tank Reinforced concrete roof Prestressed concrete outer tank wall

  34. 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

  35. 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

  36. 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

  37. 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

  38. Bottom heater Trombone shape type • Conventional type Kajima type

  39. PUF panel PUF cap • Stud bolt PC structure Surface material (in-situ installation) Liner plate PUF (in-situ injection & foam) PUF panel

  40. Construction experience • Petrochemical complex • in Oita, Japan

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