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WO2017069196A1 - Double-shell tank for ship, and ship - Google Patents

Double-shell tank for ship, and ship Download PDF

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Publication number
WO2017069196A1
WO2017069196A1 PCT/JP2016/081095 JP2016081095W WO2017069196A1 WO 2017069196 A1 WO2017069196 A1 WO 2017069196A1 JP 2016081095 W JP2016081095 W JP 2016081095W WO 2017069196 A1 WO2017069196 A1 WO 2017069196A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
inner tank
support member
tank
dome
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/081095
Other languages
French (fr)
Japanese (ja)
Inventor
今井　達也
敦司 佐野
村岸　治
良介 浦口
雄三 江口
雄一郎 上田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Priority to EP16857509.0A priority Critical patent/EP3366568B1/en
Priority to JP2017545785A priority patent/JP6634090B2/en
Priority to CN201680061754.5A priority patent/CN108137135B/en
Priority to KR1020187013097A priority patent/KR102438162B1/en
Publication of WO2017069196A1 publication Critical patent/WO2017069196A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels
    • F17C13/082—Mounting arrangements for vessels for large sea-borne storage vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B2025/087—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid comprising self-contained tanks installed in the ship structure as separate units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2231/00—Material used for some parts or elements, or for particular purposes
    • B63B2231/40—Synthetic materials
    • B63B2231/52—Fibre reinforced plastics materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/054—Size medium (>1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/014—Suspension means
    • F17C2203/015—Bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0375—Thermal insulations by gas
    • F17C2203/0379—Inert
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0391—Thermal insulations by vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F17C2205/0149—Vessel mounted inside another one
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/018—Supporting feet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0308—Protective caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F17C2221/017—Helium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

Definitions

  • the present invention relates to a marine double-shell tank mounted on a marine vessel and a marine vessel including the marine double-shell tank.
  • a heat insulating layer for example, a vacuum heat insulating layer
  • the inner tank and the outer tank for example, refer to Patent Document 1.
  • the inner tank includes an inner tank main body part that stores liquefied gas, an inner tank dome that protrudes upward from the inner tank main body part, and the outer tank includes an outer tank main body part that surrounds the inner tank main body part, and Includes an outer dome that surrounds the inner dome.
  • the inner tank dome is for collecting pipes penetrating the inner tank, and these pipes are arranged so as to penetrate the inner tank dome and the outer tank dome.
  • the relative position between the inner tank dome and the outer tank dome in the radial direction of the inner tank dome (hereinafter referred to as “relative position between the domes”). If the relative position between the domes is not constrained, the inner tank is displaced relative to the outer tank due to inertia when the ship shakes, and repeated stress acts on the pipes that penetrate the inner tank dome and the outer tank dome. Because it does. Moreover, when the liquefied gas is introduced into the inner tank, the temperature of the entire inner tank becomes low, and the inner tank dome thermally contracts in the axial direction and the radial direction. It is necessary to restrain the position.
  • an object of the present invention is to provide a marine double shell tank capable of restraining the relative position between the domes while allowing thermal contraction of the inner tank dome, and a ship including the marine double shell tank.
  • a marine double-shell tank includes an inner tank main body that stores liquefied gas, an inner tank including an inner tank dome that protrudes upward from the inner tank main body, and the inner tank.
  • An outer tub including an outer tub main body that surrounds the main body and the outer tub dome surrounding the inner dome, and at least three supports disposed around the inner dome between the inner tub and the outer tub
  • Each of the support mechanisms has a first support surface fixed to one of the inner tank and the outer tank and having a first support surface parallel to a reference surface including a central axis of the inner tank dome.
  • a member a second support member fixed to the other of the inner tub and the outer tub and having a second support surface facing the first support surface, and the first support surface and the second support surface It is fixed to the second support surface and is slid along the first support surface.
  • a heat insulating member the person to be secured to the inner tub of the first support member and the second support member is positioned on the reference surface, it is characterized.
  • At least 3 support mechanism is arrange
  • the first support member may be a plate having the first support surface as one main surface
  • the second support member may be a plate having the second support surface as one main surface. According to this configuration, the first support member and the second support member can be manufactured at low cost.
  • the first support member may be fixed to the outer tank dome or the outer tank main body, and the second support member may be fixed to the inner tank dome or the inner tank main body. According to this configuration, since the first support surface is maintained at substantially normal temperature, the sliding performance between the heat insulating member and the first support surface can be designed in the normal temperature state.
  • the tubular heat insulating member may extend in a direction perpendicular to the reference plane. According to this configuration, it is possible to suppress heat intrusion from the outer tank to the inner tank via the heat insulating member.
  • Each of the support mechanisms includes a first holding member and a second holding member that hold one end and the other end of the tubular heat insulating member, respectively, and the tubular heat insulating member passes through the first holding member. It may be in contact with one support surface and fixed to the second support surface via the second holding member. According to this configuration, one end of a simple-shaped tubular heat insulating member can be easily fixed to the second support surface using the second holding member. Moreover, since the 1st holding member holding the other end of a tubular heat insulation member can be made to contact a 1st support surface with a large area, a tubular heat insulation member can be smoothly slid with a 1st holding member. .
  • a lubricating liner may be sandwiched between the first holding member and the first support surface. According to this configuration, good slidability can be obtained with a simple configuration.
  • the heat insulating member may be made of glass fiber reinforced plastic. According to this structure, the heat penetration
  • the second support member is a plate having the second support surface as one main surface and the other main surface, and a pair of the first support members are provided and arranged on both sides of the second support member. May be. According to this configuration, the inner tank dome can be restrained in the circumferential direction by each support mechanism alone.
  • Each of the support mechanisms includes the first support member and the second support member one by one, and the positional relationship between the first support member and the second support member is reversed between the adjacent support mechanisms. It may be. According to this structure, while restraining the relative position between the domes and restraining the inner tank dome in the circumferential direction, each support mechanism can have a simple structure, and the position adjustment between the support mechanisms is facilitated.
  • Each of the support mechanisms includes one each of the first support member and the second support member, and the number of the support mechanisms is four or more, and the first of the at least four adjacent support mechanisms is the first.
  • the positional relationship between the support member and the second support member may be reversed. Even in this configuration, each support mechanism can have a simple structure while restraining the relative position between the domes and restraining the inner tank dome in the circumferential direction.
  • the space between the inner tank and the outer tank may be a vacuum space. According to this configuration, the liquefied gas can be maintained at a low temperature for a long time.
  • the inner tank main body is a cylindrical shape extending in the horizontal direction, and the four support mechanisms are arranged between the inner tank dome and the outer tank dome from the central axis of the inner tank dome. You may arrange
  • the ship of the present invention is characterized by comprising the above-described marine double shell tank.
  • the relative position between the domes can be constrained while allowing heat shrinkage of the inner tank dome.
  • FIG. 1 is a longitudinal sectional view of a marine double shell tank according to a first embodiment of the present invention. It is sectional drawing to which the principal part of FIG. 1 was expanded.
  • FIG. 3 is a transverse sectional view schematically showing a support mechanism taken along line III-III in FIG. 2. It is a cross-sectional view of one support mechanism.
  • (A) and (b) are longitudinal sectional views taken along lines VA-VA and VB-VB in FIG. 4, respectively. It is a cross-sectional view which shows typically the support mechanism in the modification of 1st Embodiment. It is a cross-sectional view schematically showing a support mechanism in a marine double shell tank according to a second embodiment of the present invention. It is a cross-sectional view schematically showing a support mechanism in a marine double shell tank according to a third embodiment of the present invention.
  • FIG. 1 shows a marine double-shell tank 2A mounted on a marine vessel 1 such as a liquefied gas carrier ship according to the first embodiment of the present invention.
  • the double-shell tank 2 ⁇ / b> A includes an inner tank 3 and an outer tank 4 that encloses a space 20 around the inner tank 3.
  • the space 20 between the inner tub 3 and the outer tub 4 is a vacuum space.
  • the space 20 between the inner tank 3 and the outer tank 4 may be filled with a gas having low thermal conductivity such as argon gas.
  • the inner tank 3 includes an inner tank main body 31 that stores liquefied gas, and an inner tank dome 32 that protrudes upward from the inner tank main body 31.
  • the axial direction of the inner tank dome 32 is parallel to the vertical direction, but the axial direction of the inner tank dome 32 may be slightly inclined with respect to the vertical direction.
  • the inner tank dome 32 is provided with a manhole 30 for checking the inner tank.
  • the manhole 30 may be provided in the inner tank main body 31.
  • the inner tank main body 31 has a cylindrical shape extending in the horizontal direction.
  • the inner tank main body 31 may be, for example, a spherical shape or a square shape. More specifically, the inner tank main body 31 includes a trunk portion that extends in the lateral direction with a constant cross-sectional shape, and a hemispherical blocking portion that blocks openings on both sides of the trunk portion.
  • the closing part may be a flat perpendicular to the body part or may be dish-shaped.
  • the liquefied gas stored in the inner tank main body 31 is, for example, liquefied petroleum gas (LPG, about ⁇ 45 ° C.), liquefied ethylene gas (LEG, about ⁇ 100 ° C.), liquefied natural gas (LNG, about ⁇ 160 ° C.). , Liquefied hydrogen (LH 2 , about ⁇ 250 ° C.), liquefied helium (LHe, about ⁇ 270 ° C.).
  • LPG liquefied petroleum gas
  • LEG liquefied ethylene gas
  • LNG liquefied natural gas
  • LHe Liquefied hydrogen
  • LHe liquefied helium
  • the outer tub 4 includes an outer tub main body portion 41 surrounding the inner tub main body portion 31 and an outer tub dome 42 surrounding the inner tub dome 32. That is, the outer tank main body 41 has a shape in which the inner tank main body 31 is enlarged, and the outer tank dome 42 has a shape in which the inner tank dome 32 is enlarged. However, the shape of the outer tank dome 42 may be slightly different from the shape of the inner tank dome 32.
  • the outer tank dome 42 is provided with a manhole 40 at a position corresponding to the inner tank dome 32.
  • a pair of external pedestals 12 that are separated from each other in the axial direction of the outer tub main body 41 are provided on the ship bottom 11, and the outer tub main body 41 is supported by the outer pedestal 12.
  • a pair of internal pedestals 21 are disposed between the inner tub main body 31 and the outer tub main body 41 at positions corresponding to the outer pedestal 12.
  • the internal pedestal 21 supports the inner tank body 31 so as to be slidable in the axial direction. This is to cope with thermal contraction in the axial direction of the inner tank body 31 when liquefied gas is introduced into the inner tank 3.
  • various pipes 13 such as a liquefied gas pipe and an electric pipe are provided so as to penetrate the inner tank dome 32 and the outer tank dome 42.
  • a liquefied gas pipe and an electric pipe are provided so as to penetrate the inner tank dome 32 and the outer tank dome 42.
  • FIG. 1 only one pipe is drawn as a representative.
  • the cross-sectional shapes of the inner tank dome 32 and the outer tank dome 42 are circular.
  • the cross-sectional shapes of the inner tank dome 32 and the outer tank dome 42 may be elliptical, for example.
  • the center axis 36 of the inner tank dome 32 and the center axis of the outer tank dome 42 correspond, they may shift
  • the inner tank dome 32 has a peripheral wall 33 that extends upward from the inner tank main body 31 and a dish-shaped ceiling wall 34 that rises upward from the upper end of the peripheral wall 33.
  • the outer tub dome 42 has a peripheral wall 43 that extends upward from the outer tub main body 41 and a dish-shaped ceiling wall 44 that rises upward from the upper end of the peripheral wall 43.
  • the ceiling walls 34 and 44 may have other shapes such as a hemispherical shape or a flat plate shape.
  • the above-described manholes 30 and 40 are provided in the ceiling walls 34 and 44, respectively.
  • a bellows tube 45 is incorporated in the peripheral wall 43 of the outer tank dome 42, and the peripheral wall 43 is divided into a root portion 43A and a tip portion 43B by the bellows tube 45.
  • the pipe 13 described above passes through the peripheral wall 33 of the inner tank dome 32 and the distal end portion 43B of the peripheral wall 43 of the outer tank dome 42.
  • the pipe 13 may penetrate the ceiling wall 34 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42.
  • the pipe 13 may be bent between the inner tank dome 32 and the outer tank dome 42, and may penetrate the peripheral wall 33 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42, or the inner tank dome 32.
  • the ceiling wall 34 and the peripheral wall 43 of the outer tub dome 42 may be penetrated.
  • the first annular plate 22 is fixed to the inner peripheral surface of the distal end portion 43B of the peripheral wall 43 of the outer tank dome 42.
  • a second annular plate 23 facing the first annular plate 22 is fixed to the outer peripheral surface of the peripheral wall 43 of the inner tank dome 32.
  • the second annular plate 23 is located below the first annular plate 22, but the second annular plate 23 may be located above the first annular plate 22.
  • the first annular plate 22 and the second annular plate 23 are connected to each other by a plurality of connecting members 25.
  • Each connecting member 25 may have a columnar shape or a block shape.
  • a tubular blocking member 24 that partitions the space 20 into a lower region and an upper region is disposed in the outer tank dome 42.
  • the blocking member 24 is for reducing the volume that is released to the atmosphere when the manhole 40 is opened.
  • the arrangement of the blocking member 24 is not limited to this.
  • tubular protrusions are provided on the ceiling wall 34 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42 so as to form double pipes surrounding the manholes 30 and 40, and an annular plate is provided between these protrusions.
  • a blocking member 24 may be disposed.
  • a plurality of first projecting pieces scattered in the circumferential direction are provided, and instead of the second annular plate 23, a plurality of second projecting pieces facing the first projecting piece are provided. It may be provided.
  • At least three support mechanisms 5 are arranged around the inner tank dome 32 between the peripheral wall 33 of the inner tank dome 32 and the root portion 43A of the peripheral wall 43 of the outer tank dome 42. These support mechanisms 5 are for restraining relative positions between the domes (relative positions of the inner tank dome 32 and the outer tank dome 42 in the radial direction of the inner tank dome 32). In the present embodiment, four support mechanisms 5 are provided.
  • the support mechanism 5 is disposed at an angle of 45 degrees with respect to the axial direction D of the inner tank main body 31 from the central axis 36 of the inner tank dome 32.
  • the angular intervals of the support mechanism 5 do not necessarily have to be equal, and may be uneven.
  • each support mechanism 5 includes a pair of first support members 6 fixed to the outer tank dome 42 and one second support member 7 fixed to the inner tank dome 32.
  • the second support member 7 is located on a reference surface 50 including the central axis 36 of the inner tank dome 32 (that is, a surface defined by the axial direction and the radial direction of the inner tank dome 32), and the first support member 6 is disposed on both sides of the second support member 7.
  • Each first support member 6 has a first support surface 61 parallel to the reference surface 50 on the second support member 7 side.
  • the second support member 7 has a pair of second support surfaces 71 facing the first support surface 61.
  • each first support member 6 is a plate having the first support surface 61 as one main surface, and the second support member 7 uses the second support surface 71 as one main surface and the other main surface. It is a board used as a surface.
  • each first support member 6 is not necessarily a plate and may have any shape as long as it has the first support surface 61. However, if the first support member 6 and the second support member 7 are plates, they can be manufactured at low cost.
  • the second support member 7 protrudes radially outward from the peripheral wall 33 of the inner tank dome 32. That is, the second support surface 71 is parallel to the reference surface 50.
  • a doubling plate 35 is joined to the peripheral wall 33 of the inner tank dome 32, and the second support member 7 is fixed to the peripheral wall 33 via the doubling plate 35.
  • the doubling plate 35 may be omitted, and the second support member 7 may be directly fixed to the peripheral wall 33.
  • each first support member 6 is fixed to the base portion 43A of the peripheral wall 43 of the outer tank dome 42, and protrudes in parallel with the second support member 7 from the base portion 43A toward the peripheral wall 33 of the inner tank dome 32. ing.
  • the inner tank dome 32 is provided at the tip of the main surface (outer main surface) opposite to the first support surface 61 of each first support member 6.
  • a reinforcing plate 62 extending in the axial direction is joined perpendicularly to the first support surface 61, and is connected to the upper end and the lower end of the outer main surface of the first support member 6 between the reinforcing plate 62 and the root portion 43A.
  • Ribs 63 are provided.
  • a reinforcing plate 72 extending in the axial direction of the inner tank dome 32 is provided at the tip of each second support surface 71 of the second support member 7. Ribs 73 connected to the upper and lower ends of the second support surface 71 are provided between the reinforcing plate 72 and the doubling plate 35.
  • a heat insulating member 55 is interposed between the first support surface 61 and each second support surface 71.
  • the heat insulating member 55 has a tubular shape extending in a direction orthogonal to the reference surface 50.
  • the axial direction of the heat insulating member 55 does not necessarily have to be parallel to the direction orthogonal to the reference plane 50, and may be slightly inclined with respect to the direction orthogonal to the reference plane.
  • the cross-sectional shape of the tubular heat insulating member 55 may be circular or polygonal.
  • the tubular heat insulating member 55 is made of glass fiber reinforced plastic (GFRP).
  • GFRP glass fiber reinforced plastic
  • the material constituting the tubular heat insulating member 55 may be carbon fiber reinforced plastic (CFRP), other FRP (for example, cloth reinforced phenol resin), or metal.
  • FIG. 3 referred to before is a diagram schematically showing the support mechanism 5, and that the heat insulating member 55 slides along the first support surface 61 is represented by a gap between them (in FIG. 3).
  • the ribs 63 and 73 are indicated by two-dot chain lines, and the holding members 8A and 8B are omitted).
  • sliding means not only a relative movement in a state where two objects are in physical contact but also a relative movement in a non-contact state.
  • each of the first holding member 8A and the second holding member 8B has a shape in which the tubular heat insulating member 55 is inserted.
  • each holding member includes a tubular portion 82 that fits with the tubular heat insulating member 55, and a bottom portion 81 that abuts against an end surface of the tubular heat insulating member 55.
  • an opening is provided in the center of the bottom 81, but the opening may not be provided.
  • the cylindrical portion 82 is coupled to the heat insulating member 55 by a pin 56.
  • each holding member may have a shape in which the holding member is inserted into the tubular heat insulating member 55. Further, each holding member and the heat insulating member 55 may be coupled by screws, rivets or the like.
  • the lubricating liner 51 is sandwiched between the first holding member 8A and the first support surface 61.
  • the thickness of the lubricating liner 51 is not particularly limited, and the lubricating liner 51 may be thin or thick.
  • the lubricating liner 51 is fixed to the first support surface 61 with, for example, screws. However, the lubricating liner 51 may be fixed to the first holding member 8A.
  • the lubrication liner 51 is made of a material having good slidability (for example, fluororesin, molybdenum disulfide).
  • At least three support mechanisms 5 are arranged around the inner tank dome 32, and the heat insulating member 55 included in each support mechanism 5 is connected to the reference surface 50. Since the inner tank dome 32 can move in parallel directions, the relative position between the domes (the inner tank dome 32 and the outer tank dome 42 in the radial direction of the inner tank dome 32 is allowed while allowing thermal contraction in the axial direction and the radial direction of the inner tank dome 32. Relative position) can be constrained.
  • the heat insulating member 55 is made of GFRP, it is possible to further suppress the heat intrusion through the heat insulating member 55.
  • unit can restrain the inner tank dome 32 in the circumferential direction.
  • the space 20 between the inner tank 3 and the outer tank 4 is a vacuum space, the liquefied gas can be maintained at a low temperature for a long time.
  • the four support mechanisms 5 are arranged two from the center axis 36 of the inner tank dome 32 in the front-rear direction and two in the left-right direction. It may be. However, in this case, since the upper surface of the inner tank body 31 is straight in the front-rear direction but is bent in the left-right direction, the distance from the inner tank body 31 to the left and right support mechanisms 5 is the inner distance. The distance is longer than the distance from the tank body 31 to the front and rear support mechanisms 5. On the other hand, since the distance from the inner tank main-body part 31 to all the support mechanisms 5 will become the same if it is a layout like the said embodiment, the load which acts on all the support mechanisms 5 can be equalize
  • each support mechanism 5 is fixed to the inner tank dome 32, one first support member 6 positioned on the reference plane 50, and the outer tank.
  • a pair of second support members 7 fixed on the dome 42 and disposed on both sides of the first support member 6 may be included.
  • each second support member 7 is not necessarily a plate, and may have any shape as long as it has the second support surface 71.
  • the 1st support member 6 is being fixed to the outer tank 4 and the 2nd support member 7 is being fixed to the inner tank 3 like the said embodiment, the 1st support surface 61 will be maintained at substantially normal temperature. Therefore, the sliding performance between the heat insulating member 55 and the first support surface 61 can be designed in a normal temperature state.
  • the second support surface 71 of the second support member 7 does not necessarily have to be parallel to the reference surface 50.
  • the second support surface 71 may be inclined with respect to the reference surface 50 so as to be along the end portion of the heat insulating member 55.
  • the second support member 7 positioned on the reference surface 50 may be disposed so that the reference surface 50 passes through at least a part of the second support member 7.
  • the heat insulating member 55 may be a solid block. However, if the heat insulating member 55 is tubular as in the above-described embodiment, heat intrusion from the outer tank 4 to the inner tank 3 through the heat insulating member 55 can be suppressed. When the heat insulating member 55 is a solid block, the heat insulating member 55 may be directly fixed to the second support surface 71 and slid directly with respect to the first support surface 61.
  • the heat insulating member 55 can be directly fixed to the second support surface 71 and can be slid directly with respect to the first support surface 61. It is. However, if it is a structure like the said embodiment, the end of the simple-shaped tubular heat insulation member 55 can be easily fixed to the 2nd support surface 71 using the 2nd holding member 8B. Further, since the first holding member 8A holding the other end of the tubular heat insulating member 55 can be brought into contact with the first support surface 61 in a large area, the tubular heat insulating member 55 can be smoothly slid together with the first holding member 8A. Can be moved.
  • the lubrication liner 51 is not necessarily sandwiched between the first holding member 8A and the first support surface 61.
  • the first holding member 8A can be made of a resin having good sliding properties.
  • a lubricant may be applied on the first support surface 61 with which the first holding member 8A is in contact.
  • the lubricating liner 51 is sandwiched between the first holding member 8A and the first support surface 61 as in the above embodiment, good slidability can be obtained with a simple configuration.
  • the support mechanism 5 may be disposed between the peripheral wall 33 of the inner tank dome 32 and the distal end portion 43B of the peripheral wall 43 of the outer tank dome 42.
  • the heat insulating member 55 may slide only in the direction orthogonal to the central axis 36 of the inner tank dome 32.
  • the bellows tube 45 is not necessarily incorporated in the peripheral wall 43 of the outer tank dome 42. In this case, the movement of the inner tank dome 32 in the axial direction when the liquefied gas is introduced into the inner tank 3 and the inner tank main body 31 is thermally contracted is allowed by the bending of the pipe 13.
  • each support mechanism 5 includes one first support member 6 fixed to the outer tank dome 42 and a pair of second support members 7 fixed to the inner tank dome 32.
  • the pair of second support members 7 are disposed on both sides of the first support member 6 and are located on a reference surface 50 including the central axis 36 of the inner tank dome 32.
  • Each second support member 7 is a plate that protrudes radially outward from the peripheral wall 33 of the inner tank dome 32, and has a second support surface 71 parallel to the reference surface 50.
  • the first support member 6 has a substantially trapezoidal shape when viewed from the axial direction of the inner tank dome 32, and has a pair of first support surfaces 61 parallel to the reference surface 50.
  • the tubular heat insulating member 55 is in contact with the first support surface 61 via the first holding member 8A, and is fixed to the second support surface 71 via the second holding member 8B. It is the same.
  • each support mechanism 5 is fixed to the inner tank dome 32, the 1st support member 6 located on the reference plane 50, and the 1st fixed to the outer tank dome 42,
  • One second support member 7 (substantially trapezoidal when viewed from the axial direction of the inner tank dome 32) disposed between the support members 6 may be included.
  • each first support member 6 is not necessarily a plate, and may have any shape as long as it has the first support surface 61.
  • the 1st support member 6 is being fixed to the outer tank 4 and the 2nd support member 7 is being fixed to the inner tank 3 like the said embodiment, the 1st support surface 61 will be maintained at substantially normal temperature. Therefore, the sliding performance between the heat insulating member 55 and the first support surface 61 can be designed in a normal temperature state.
  • each support mechanism 5 has one first support member 6 fixed to the outer tank dome 42 and one second support member positioned on the reference surface 50 fixed to the inner tank dome 32. 7 is included. For this reason, the support mechanisms 5 are alternately opposite. In other words, the positional relationship between the first support member 6 and the second support member 7 is reversed between the adjacent support mechanisms 5.
  • the tubular heat insulating member 55 is in contact with the first support surface 61 via the first holding member 8A, and is fixed to the second support surface 71 via the second holding member 8B. It is the same.
  • the first support member 6 is not necessarily a plate and may have any shape as long as the first support surface 61 is provided.
  • the second support member 7 is not necessarily a plate, and may have any shape as long as the second support surface 71 is provided.
  • each support mechanism 5 can have a simple structure, and position adjustment between the support mechanisms 5 is easy. It becomes.
  • the number of support mechanisms 5 is desirably an even number in order to ensure symmetry. If the number of the support mechanisms 5 is an even number, the first support member is composed of all the adjacent support mechanisms 5 (for example, if the number of the support mechanisms 5 is four, the four pairs of adjacent support mechanisms 5). The positional relationship between 6 and the second support member 7 is reversed.
  • the adjacent support mechanisms 5 except for one set of adjacent support mechanisms 5 (for example, if the number of the support mechanisms 5 is 5, four sets of adjacent The positional relationship between the first support member 6 and the second support member 7 is reversed (with matching support mechanisms 5).
  • each support mechanism 5 includes one first support member 6 fixed on the inner tank dome 32 and positioned on the reference surface 50 and one first support member fixed on the outer tank dome 42.
  • Two support members 7 may be included.
  • the 1st support member 6 is being fixed to the outer tank 4 and the 2nd support member 7 is being fixed to the inner tank 3 like the said embodiment, the 1st support surface 61 will be maintained at substantially normal temperature. Therefore, the sliding performance between the heat insulating member 55 and the first support surface 61 can be designed in a normal temperature state.
  • the support mechanism 5 does not necessarily have to be alternately opposite.
  • the positional relationship between the first support member 6 and the second support member 7 is reversed between at least four adjacent support mechanisms 5.
  • Each support mechanism 5 can have a simple structure while restraining the relative position between the domes and restraining the inner tank dome 32 in the circumferential direction.
  • the positional relationship between the first support member 6 and the second support member 7 is reversed between the four pairs of adjacent support mechanisms 5 (A2 and B1, B1 and A3, A3 and B2, B3 and A1). .
  • the support mechanism 5 is not necessarily disposed between the inner tank dome 32 and the outer tank dome 42, and may be disposed between the inner tank body 31 and the outer tank body 41. That is, even if the first support member 6 is fixed to one of the inner tank main body 31 and the outer tank main body 41, and the second support member 7 is fixed to the other of the inner tank main body 31 and the outer tank main body 41. Good. In this case, the one of the first support member 6 and the second support member 7 that is fixed to the inner tank main body 31 is located on the reference surface 50.
  • all the support mechanisms 5 do not necessarily have to be arranged at the same height position, and may be arranged so as to be alternately shifted up and down, for example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Revetment (AREA)

Abstract

A double-shell tank for a ship is provided with an inner vessel including an inner-vessel body for storing liquid gas and an inner-vessel drum protruding upward from the inner-vessel body, an outer vessel including an outer-vessel body surrounding the inner-vessel body and an outer-vessel drum surrounding the inner-vessel drum, and at least three support mechanisms disposed between the inner vessel and the outer vessel and around the inner-vessel drum. Each of the support mechanisms includes: a first support member secured to one of the inner vessel and the outer vessel, the first support member having a first support surface parallel to a reference surface that includes the central axis of the inner-vessel drum; a second support member secured to the other of the inner vessel and the outer vessel, the second support member having a second support surface facing the first support surface; and a heat insulation member interposed between the first support surface and the second support surface, the heat insulation member being secured to the second support surface and sliding along the first support surface. The support member that is secured to the inner vessel among the first support member and the second support member is positioned on the reference surface.

Description

舶用二重殻タンクおよび船舶Marine double-shell tank and ship

　本発明は、船舶に搭載される舶用二重殻タンク、およびこの舶用二重殻タンクを含む船舶に関する。 The present invention relates to a marine double-shell tank mounted on a marine vessel and a marine vessel including the marine double-shell tank.

　例えば液化ガス運搬船などの船舶には、液化ガス用の二重殻タンクが搭載されている。この舶用二重殻タンクでは、内槽と外槽との間に断熱層（例えば、真空断熱層）が形成される（例えば、特許文献１参照）。 For example, ships such as liquefied gas carriers are equipped with a double-shell tank for liquefied gas. In this marine double shell tank, a heat insulating layer (for example, a vacuum heat insulating layer) is formed between the inner tank and the outer tank (for example, refer to Patent Document 1).

　より詳しくは、内槽は、液化ガスを貯留する内槽本体部と、内槽本体部から上向きに突出する内槽ドームを含み、外槽は、内槽本体部を取り囲む外槽本体部と、内槽ドームを取り囲む外槽ドームを含む。内槽ドームは内槽を貫通する配管を集約するためものであり、それらの配管は、内槽ドームおよび外槽ドームを貫通するように配置される。 More specifically, the inner tank includes an inner tank main body part that stores liquefied gas, an inner tank dome that protrudes upward from the inner tank main body part, and the outer tank includes an outer tank main body part that surrounds the inner tank main body part, and Includes an outer dome that surrounds the inner dome. The inner tank dome is for collecting pipes penetrating the inner tank, and these pipes are arranged so as to penetrate the inner tank dome and the outer tank dome.

特開２０１５－４３８３号公報Japanese Patent Laying-Open No. 2015-4383

　ところで、舶用二重殻タンクでは、内槽ドームの径方向における内槽ドームと外槽ドームの相対位置（以下、「ドーム間相対位置」という）を拘束することが望ましい。ドーム間相対位置が拘束されていないと、船が動揺したときに慣性力によって内槽が外槽に対して相対的に変位し、内槽ドームおよび外槽ドームを貫通する配管に繰り返し応力が作用するからである。しかも、内槽内に液化ガスが投入されたときには内槽全体が低温となって内槽ドームが軸方向および径方向に熱収縮するため、この内槽ドームの熱収縮を許容しながらドーム間相対位置を拘束する必要がある。 By the way, in the marine double shell tank, it is desirable to restrain the relative position between the inner tank dome and the outer tank dome in the radial direction of the inner tank dome (hereinafter referred to as “relative position between the domes”). If the relative position between the domes is not constrained, the inner tank is displaced relative to the outer tank due to inertia when the ship shakes, and repeated stress acts on the pipes that penetrate the inner tank dome and the outer tank dome. Because it does. Moreover, when the liquefied gas is introduced into the inner tank, the temperature of the entire inner tank becomes low, and the inner tank dome thermally contracts in the axial direction and the radial direction. It is necessary to restrain the position.

　そこで、本発明は、内槽ドームの熱収縮を許容しながらドーム間相対位置を拘束することができる舶用二重殻タンクおよびこの舶用二重殻タンクを含む船舶を提供することを目的とする。 Therefore, an object of the present invention is to provide a marine double shell tank capable of restraining the relative position between the domes while allowing thermal contraction of the inner tank dome, and a ship including the marine double shell tank.

　前記課題を解決するために、本発明の舶用二重殻タンクは、液化ガスを貯留する内槽本体部および前記内槽本体部から上向きに突出する内槽ドームを含む内槽と、前記内槽本体部を取り囲む外槽本体部および前記内槽ドームを取り囲む外槽ドームを含む外槽と、前記内槽と前記外槽との間で、前記内槽ドームの回りに配置された少なくとも３つの支持機構と、を備え、前記支持機構のそれぞれは、前記内槽と前記外槽の一方に固定された、前記内槽ドームの中心軸を含む基準面と平行な第１支持面を有する第１支持部材と、前記内槽と前記外槽の他方に固定された、前記第１支持面と対向する第２支持面を有する第２支持部材と、前記第１支持面と前記第２支持面との間に介在する、前記第２支持面に固定され、前記第１支持面に沿って摺動する断熱部材と、を含み、前記第１支持部材と前記第２支持部材のうちの前記内槽に固定される方は、前記基準面上に位置する、ことを特徴とする。 In order to solve the above problems, a marine double-shell tank according to the present invention includes an inner tank main body that stores liquefied gas, an inner tank including an inner tank dome that protrudes upward from the inner tank main body, and the inner tank. An outer tub including an outer tub main body that surrounds the main body and the outer tub dome surrounding the inner dome, and at least three supports disposed around the inner dome between the inner tub and the outer tub Each of the support mechanisms has a first support surface fixed to one of the inner tank and the outer tank and having a first support surface parallel to a reference surface including a central axis of the inner tank dome. A member, a second support member fixed to the other of the inner tub and the outer tub and having a second support surface facing the first support surface, and the first support surface and the second support surface It is fixed to the second support surface and is slid along the first support surface. To include a heat insulating member, the person to be secured to the inner tub of the first support member and the second support member is positioned on the reference surface, it is characterized.

　上記の構成によれば、内槽ドームの回りに少なくとも３つの支持機構が配置され、各支持機構に含まれる断熱部材が内槽ドームの中心軸を含む基準面と平行な方向に移動可能であるので、内槽ドームの軸方向および径方向への熱収縮を許容しながらドーム間相対位置を拘束することができる。 According to said structure, at least 3 support mechanism is arrange | positioned around an inner tank dome, and the heat insulation member contained in each support mechanism is movable to the direction parallel to the reference plane containing the central axis of an inner tank dome. Therefore, the relative position between the domes can be constrained while allowing heat shrinkage in the axial direction and the radial direction of the inner tank dome.

　前記第１支持部材は、前記第１支持面を一方の主面とする板であり、前記第２支持部材は、前記第２支持面を一方の主面とする板であってもよい。この構成によれば、第１支持部材および第２支持部材を安価に作製することができる。 The first support member may be a plate having the first support surface as one main surface, and the second support member may be a plate having the second support surface as one main surface. According to this configuration, the first support member and the second support member can be manufactured at low cost.

　前記第１支持部材は、前記外槽ドームまたは前記外槽本体部に固定されており、前記第２支持部材は、前記内槽ドームまたは前記内槽本体部に固定されていてもよい。この構成によれば、第１支持面がほぼ常温に保たれるために、断熱部材と第１支持面との間の摺動性能を常温状態で設計することができる。 The first support member may be fixed to the outer tank dome or the outer tank main body, and the second support member may be fixed to the inner tank dome or the inner tank main body. According to this configuration, since the first support surface is maintained at substantially normal temperature, the sliding performance between the heat insulating member and the first support surface can be designed in the normal temperature state.

　前記断熱部材は、前記基準面と直交する方向に延びる管状であってもよい。この構成によれば、断熱部材を介した外槽外から内槽内への熱侵入を抑制することができる。 The tubular heat insulating member may extend in a direction perpendicular to the reference plane. According to this configuration, it is possible to suppress heat intrusion from the outer tank to the inner tank via the heat insulating member.

　前記支持機構のそれぞれは、前記管状の断熱部材の一端および他端をそれぞれ保持する第１保持部材および第２保持部材を含み、前記管状の断熱部材は、前記第１保持部材を介して前記第１支持面に当接しており、前記第２保持部材を介して前記第２支持面に固定されていてもよい。この構成によれば、第２保持部材を用いて、シンプルな形状の管状の断熱部材の一端を簡単に第２支持面に固定することができる。また、管状の断熱部材の他端を保持する第１保持部材を第１支持面に大きな面積で接触させることができるため、管状の断熱部材を第１保持部材と共にスムーズに摺動させることができる。 Each of the support mechanisms includes a first holding member and a second holding member that hold one end and the other end of the tubular heat insulating member, respectively, and the tubular heat insulating member passes through the first holding member. It may be in contact with one support surface and fixed to the second support surface via the second holding member. According to this configuration, one end of a simple-shaped tubular heat insulating member can be easily fixed to the second support surface using the second holding member. Moreover, since the 1st holding member holding the other end of a tubular heat insulation member can be made to contact a 1st support surface with a large area, a tubular heat insulation member can be smoothly slid with a 1st holding member. .

　前記第１保持部材と前記第１支持面との間には、潤滑ライナーが挟まれていてもよい。この構成によれば、簡易な構成で良好な摺動性を得ることができる。 A lubricating liner may be sandwiched between the first holding member and the first support surface. According to this configuration, good slidability can be obtained with a simple configuration.

　前記断熱部材は、ガラス繊維強化プラスチックからなってもよい。この構成によれば、断熱部材を介した熱侵入をいっそう抑制することができる。 The heat insulating member may be made of glass fiber reinforced plastic. According to this structure, the heat penetration | invasion via a heat insulation member can be suppressed further.

　前記第２支持部材は、前記第２支持面を一方の主面および他方の主面とする板であり、前記第１支持部材は、一対設けられていて、前記第２支持部材の両側に配置されていてもよい。この構成によれば、各支持機構単体で、内槽ドームを周方向に拘束することができる。 The second support member is a plate having the second support surface as one main surface and the other main surface, and a pair of the first support members are provided and arranged on both sides of the second support member. May be. According to this configuration, the inner tank dome can be restrained in the circumferential direction by each support mechanism alone.

　前記支持機構のそれぞれは、前記第１支持部材および前記第２支持部材を１つずつ含み、隣り合う前記支持機構同士で前記第１支持部材と前記第２支持部材との位置関係が逆になっていてもよい。この構成によれば、ドーム間相対位置を拘束し、かつ、内槽ドームを周方向に拘束しつつ、各支持機構を簡素な構造とできるとともに、支持機構間の位置調整が容易となる。 Each of the support mechanisms includes the first support member and the second support member one by one, and the positional relationship between the first support member and the second support member is reversed between the adjacent support mechanisms. It may be. According to this structure, while restraining the relative position between the domes and restraining the inner tank dome in the circumferential direction, each support mechanism can have a simple structure, and the position adjustment between the support mechanisms is facilitated.

　前記支持機構のそれぞれは、前記第１支持部材および前記第２支持部材を１つずつ含み、前記支持機構の数は４つ以上であり、少なくとも４組の隣り合う前記支持機構同士で前記第１支持部材と前記第２支持部材との位置関係が逆になっていてもよい。この構成でも、ドーム間相対位置を拘束し、かつ、内槽ドームを周方向に拘束しつつ、各支持機構を簡素な構造とできる。 Each of the support mechanisms includes one each of the first support member and the second support member, and the number of the support mechanisms is four or more, and the first of the at least four adjacent support mechanisms is the first. The positional relationship between the support member and the second support member may be reversed. Even in this configuration, each support mechanism can have a simple structure while restraining the relative position between the domes and restraining the inner tank dome in the circumferential direction.

　前記内槽と前記外槽との間の空間は真空空間であってもよい。この構成によれば、長時間に亘り液化ガスを低温に維持することができる。 The space between the inner tank and the outer tank may be a vacuum space. According to this configuration, the liquefied gas can be maintained at a low temperature for a long time.

　前記内槽本体部は、水平方向に延びる円筒状であり、４つの前記支持機構が、前記内槽ドームと前記外槽ドームの間で、前記内槽ドームの中心軸から前記内槽本体部の軸方向に対して４５度の角度方向に配置されていてもよい。この構成によれば、内槽本体部から全ての支持機構までの距離が同じとなるため、全ての支持機構に作用する荷重を均一化することができる。 The inner tank main body is a cylindrical shape extending in the horizontal direction, and the four support mechanisms are arranged between the inner tank dome and the outer tank dome from the central axis of the inner tank dome. You may arrange | position in the angle direction of 45 degree | times with respect to an axial direction. According to this structure, since the distance from an inner tank main-body part to all the support mechanisms becomes the same, the load which acts on all the support mechanisms can be equalize | homogenized.

　また、本発明の船舶は、上記の舶用二重殻タンクを備えることを特徴とする。 Further, the ship of the present invention is characterized by comprising the above-described marine double shell tank.

　本発明によれば、内槽ドームの熱収縮を許容しながらドーム間相対位置を拘束することができる。 According to the present invention, the relative position between the domes can be constrained while allowing heat shrinkage of the inner tank dome.

本発明の第１実施形態に係る舶用二重殻タンクの縦断面図である。1 is a longitudinal sectional view of a marine double shell tank according to a first embodiment of the present invention. 図１の要部を拡大した断面図である。It is sectional drawing to which the principal part of FIG. 1 was expanded. 図２のIII－III線に沿った、支持機構を模式的に示す横断面図である。FIG. 3 is a transverse sectional view schematically showing a support mechanism taken along line III-III in FIG. 2. １つの支持機構の横断面図である。It is a cross-sectional view of one support mechanism. （ａ）および（ｂ）は、それぞれ図４のVA－VA線およびVB－VB線に沿った縦断面図である。(A) and (b) are longitudinal sectional views taken along lines VA-VA and VB-VB in FIG. 4, respectively. 第１実施形態の変形例における支持機構を模式的に示す横断面図である。It is a cross-sectional view which shows typically the support mechanism in the modification of 1st Embodiment. 本発明の第２実施形態に係る舶用二重殻タンクにおける支持機構を模式的に示す横断面図である。It is a cross-sectional view schematically showing a support mechanism in a marine double shell tank according to a second embodiment of the present invention. 本発明の第３実施形態に係る舶用二重殻タンクにおける支持機構を模式的に示す横断面図である。It is a cross-sectional view schematically showing a support mechanism in a marine double shell tank according to a third embodiment of the present invention.

　（第１実施形態）
　図１に、本発明の第１実施形態に係る、液化ガス運搬船などの船舶１に搭載される舶用二重殻タンク２Ａを示す。 (First embodiment)
FIG. 1 shows a marine double-shell tank 2A mounted on a marine vessel 1 such as a liquefied gas carrier ship according to the first embodiment of the present invention.

　具体的に、二重殻タンク２Ａは、内槽３と、内槽３の周囲の空間２０を包み込む外槽４を含む。本実施形態では、内槽３と外槽４の間の空間２０は真空空間である。ただし、内槽３と外槽４の間の空間２０には、アルゴンガス等の熱伝導率が低い気体が充填されていてもよい。 Specifically, the double-shell tank 2 </ b> A includes an inner tank 3 and an outer tank 4 that encloses a space 20 around the inner tank 3. In the present embodiment, the space 20 between the inner tub 3 and the outer tub 4 is a vacuum space. However, the space 20 between the inner tank 3 and the outer tank 4 may be filled with a gas having low thermal conductivity such as argon gas.

　内槽３は、液化ガスを貯留する内槽本体部３１と、内槽本体部３１から上向きに突出する内槽ドーム３２を含む。本実施形態では、内槽ドーム３２の軸方向が鉛直方向と平行であるが、内槽ドーム３２の軸方向は鉛直方向に対して多少傾いていてもよい。また、本実施形態では、内槽ドーム３２に内槽内点検用のマンホール３０が設けられている。ただし、マンホール３０は、内槽本体部３１に設けられていてもよい。 The inner tank 3 includes an inner tank main body 31 that stores liquefied gas, and an inner tank dome 32 that protrudes upward from the inner tank main body 31. In the present embodiment, the axial direction of the inner tank dome 32 is parallel to the vertical direction, but the axial direction of the inner tank dome 32 may be slightly inclined with respect to the vertical direction. In this embodiment, the inner tank dome 32 is provided with a manhole 30 for checking the inner tank. However, the manhole 30 may be provided in the inner tank main body 31.

　本実施形態では、内槽本体部３１が水平方向に延びる円筒状である。ただし、内槽本体部３１は、例えば、球形状であってもよいし、方形状であってもよい。より詳しくは、内槽本体部３１は、一定の断面形状で横方向に延びる胴部と、この胴部の両側の開口を塞ぐ半球状の閉塞部を含む。ただし、閉塞部は、胴部と垂直なフラットであってもよいし、皿状であってもよい。 In this embodiment, the inner tank main body 31 has a cylindrical shape extending in the horizontal direction. However, the inner tank main body 31 may be, for example, a spherical shape or a square shape. More specifically, the inner tank main body 31 includes a trunk portion that extends in the lateral direction with a constant cross-sectional shape, and a hemispherical blocking portion that blocks openings on both sides of the trunk portion. However, the closing part may be a flat perpendicular to the body part or may be dish-shaped.

　内槽本体部３１に貯留される液化ガスは、例えば、液化石油ガス（ＬＰＧ、約－４５℃）、液化エチレンガス（ＬＥＧ、約－１００℃）、液化天然ガス（ＬＮＧ、約－１６０℃）、液化水素（ＬＨ2、約－２５０℃）、液化ヘリウム（ＬＨｅ、約－２７０℃）である。 The liquefied gas stored in the inner tank main body 31 is, for example, liquefied petroleum gas (LPG, about −45 ° C.), liquefied ethylene gas (LEG, about −100 ° C.), liquefied natural gas (LNG, about −160 ° C.). , Liquefied hydrogen (LH 2 , about −250 ° C.), liquefied helium (LHe, about −270 ° C.).

　外槽４は、内槽本体部３１を取り囲む外槽本体部４１と、内槽ドーム３２を取り囲む外槽ドーム４２を含む。すなわち、外槽本体部４１は内槽本体部３１を大型化した形状を有しており、外槽ドーム４２は内槽ドーム３２を大型化した形状を有している。ただし、外槽ドーム４２の形状は、内槽ドーム３２の形状と多少異なっていてもよい。外槽ドーム４２には、内槽ドーム３２と対応する位置にマンホール４０が設けられている。 The outer tub 4 includes an outer tub main body portion 41 surrounding the inner tub main body portion 31 and an outer tub dome 42 surrounding the inner tub dome 32. That is, the outer tank main body 41 has a shape in which the inner tank main body 31 is enlarged, and the outer tank dome 42 has a shape in which the inner tank dome 32 is enlarged. However, the shape of the outer tank dome 42 may be slightly different from the shape of the inner tank dome 32. The outer tank dome 42 is provided with a manhole 40 at a position corresponding to the inner tank dome 32.

　船底１１には、外槽本体部４１の軸方向に互いに離間する一対の外部台座１２が設けられており、外部台座１２によって外槽本体部４１が支持されている。一方、内槽本体部３１と外槽本体部４１の間には、外部台座１２と対応する位置に一対の内部台座２１が配置されている。内部台座２１は、内槽本体部３１を軸方向にスライド可能に支持する。内槽３内に液化ガスが投入されたときの内槽本体部３１の軸方向の熱収縮に対応するためである。 A pair of external pedestals 12 that are separated from each other in the axial direction of the outer tub main body 41 are provided on the ship bottom 11, and the outer tub main body 41 is supported by the outer pedestal 12. On the other hand, a pair of internal pedestals 21 are disposed between the inner tub main body 31 and the outer tub main body 41 at positions corresponding to the outer pedestal 12. The internal pedestal 21 supports the inner tank body 31 so as to be slidable in the axial direction. This is to cope with thermal contraction in the axial direction of the inner tank body 31 when liquefied gas is introduced into the inner tank 3.

　また、二重殻タンク２Ａには、液化ガス配管や電気配管などの各種の配管１３が、内槽ドーム３２および外槽ドーム４２を貫通するように設けられている。なお、図１では、代表として１本の配管のみを描いている。 In the double shell tank 2A, various pipes 13 such as a liquefied gas pipe and an electric pipe are provided so as to penetrate the inner tank dome 32 and the outer tank dome 42. In FIG. 1, only one pipe is drawn as a representative.

　次に、図２および図３を参照して、内槽ドーム３２および外槽ドーム４２について詳細に説明する。 Next, the inner tank dome 32 and the outer tank dome 42 will be described in detail with reference to FIGS. 2 and 3.

　本実施形態では、内槽ドーム３２および外槽ドーム４２の断面形状が円形状である。ただし、内槽ドーム３２および外槽ドーム４２の断面形状は、例えば楕円状であってもよい。また、本実施形態では、内槽ドーム３２の中心軸３６と外槽ドーム４２の中心軸とが一致しているが、それらはずれていてもよい。 In this embodiment, the cross-sectional shapes of the inner tank dome 32 and the outer tank dome 42 are circular. However, the cross-sectional shapes of the inner tank dome 32 and the outer tank dome 42 may be elliptical, for example. Moreover, in this embodiment, although the center axis 36 of the inner tank dome 32 and the center axis of the outer tank dome 42 correspond, they may shift | deviate.

　内槽ドーム３２は、内槽本体部３１から上向きに延びる周壁３３と、周壁３３の上端から上向きに盛り上がる皿状の天井壁３４を有する。同様に、外槽ドーム４２は、外槽本体部４１から上向きに延びる周壁４３と、周壁４３の上端から上向きに盛り上がる皿状の天井壁４４を有する。なお、天井壁３４，４４は、例えば半球状や平板状などの他の形状であってもよい。天井壁３４，４４には、上述したマンホール３０，４０がそれぞれ設けられている。 The inner tank dome 32 has a peripheral wall 33 that extends upward from the inner tank main body 31 and a dish-shaped ceiling wall 34 that rises upward from the upper end of the peripheral wall 33. Similarly, the outer tub dome 42 has a peripheral wall 43 that extends upward from the outer tub main body 41 and a dish-shaped ceiling wall 44 that rises upward from the upper end of the peripheral wall 43. The ceiling walls 34 and 44 may have other shapes such as a hemispherical shape or a flat plate shape. The above-described manholes 30 and 40 are provided in the ceiling walls 34 and 44, respectively.

　本実施形態では、外槽ドーム４２の周壁４３にベローズ管４５が組み込まれており、このベローズ管４５によって周壁４３が根元部４３Ａと先端部４３Ｂとに分割されている。上述した配管１３は、内槽ドーム３２の周壁３３および外槽ドーム４２の周壁４３の先端部４３Ｂを貫通している。ただし、配管１３は、内槽ドーム３２の天井壁３４および外槽ドーム４２の天井壁４４を貫通していてもよい。あるいは、配管１３は、内槽ドーム３２と外槽ドーム４２との間で折れ曲がり、内槽ドーム３２の周壁３３および外槽ドーム４２の天井壁４４を貫通していてもよいし、内槽ドーム３２の天井壁３４および外槽ドーム４２の周壁４３を貫通していてもよい。 In this embodiment, a bellows tube 45 is incorporated in the peripheral wall 43 of the outer tank dome 42, and the peripheral wall 43 is divided into a root portion 43A and a tip portion 43B by the bellows tube 45. The pipe 13 described above passes through the peripheral wall 33 of the inner tank dome 32 and the distal end portion 43B of the peripheral wall 43 of the outer tank dome 42. However, the pipe 13 may penetrate the ceiling wall 34 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42. Alternatively, the pipe 13 may be bent between the inner tank dome 32 and the outer tank dome 42, and may penetrate the peripheral wall 33 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42, or the inner tank dome 32. The ceiling wall 34 and the peripheral wall 43 of the outer tub dome 42 may be penetrated.

　外槽ドーム４２の周壁４３の先端部４３Ｂの内周面には、第１環状板２２が固定されている。一方、内槽ドーム３２の周壁４３の外周面には、第１環状板２２と対向する第２環状板２３が固定されている。図例では、第２環状板２３が第１環状板２２の下方に位置しているが、第２環状板２３が第１環状板２２の上方に位置していてもよい。そして、第１環状板２２と第２環状板２３とが複数の連結部材２５によって互いに連結されている。各連結部材２５は、柱状であってもよいしブロック状であってもよい。このため、内槽３内に液化ガスが投入されて内槽本体部３１が熱収縮し、内槽ドーム３２が下方に移動したときには、ベローズ管４５が短縮しながら外槽ドーム４２の上側部分も内槽ドーム３２と共に下方に移動する。 The first annular plate 22 is fixed to the inner peripheral surface of the distal end portion 43B of the peripheral wall 43 of the outer tank dome 42. On the other hand, a second annular plate 23 facing the first annular plate 22 is fixed to the outer peripheral surface of the peripheral wall 43 of the inner tank dome 32. In the illustrated example, the second annular plate 23 is located below the first annular plate 22, but the second annular plate 23 may be located above the first annular plate 22. The first annular plate 22 and the second annular plate 23 are connected to each other by a plurality of connecting members 25. Each connecting member 25 may have a columnar shape or a block shape. For this reason, when the liquefied gas is introduced into the inner tank 3 and the inner tank body 31 is thermally contracted and the inner tank dome 32 is moved downward, the upper portion of the outer tank dome 42 is also shortened while the bellows tube 45 is shortened. It moves downward together with the inner tank dome 32.

　第１環状板２２と第２環状板２３の間には、外槽ドーム４２内で、空間２０を下側領域と上側領域とに仕切る管状の遮断部材２４が配置されている。この遮断部材２４は、マンホール４０が開かれたときに大気に開放される容積を少なくするためのものである。ただし、遮断部材２４の配置は、これに限定されない。例えば、内槽ドーム３２の天井壁３４および外槽ドーム４２の天井壁４４に、マンホール３０，４０を取り囲む二重管を形成するように管状の突起をそれぞれ設け、これらの突起の間に環状板である遮断部材２４を配置してもよい。また、第１環状板２２の代わりに、周方向に点在する複数の第１突出片を設けるとともに、第２環状板２３の代わりに、第１突出片に対向する複数の第２突出片を設けてもよい。 Between the first annular plate 22 and the second annular plate 23, a tubular blocking member 24 that partitions the space 20 into a lower region and an upper region is disposed in the outer tank dome 42. The blocking member 24 is for reducing the volume that is released to the atmosphere when the manhole 40 is opened. However, the arrangement of the blocking member 24 is not limited to this. For example, tubular protrusions are provided on the ceiling wall 34 of the inner tank dome 32 and the ceiling wall 44 of the outer tank dome 42 so as to form double pipes surrounding the manholes 30 and 40, and an annular plate is provided between these protrusions. A blocking member 24 may be disposed. Further, instead of the first annular plate 22, a plurality of first projecting pieces scattered in the circumferential direction are provided, and instead of the second annular plate 23, a plurality of second projecting pieces facing the first projecting piece are provided. It may be provided.

　さらに、内槽ドーム３２の周壁３３と外槽ドーム４２の周壁４３の根元部４３Ａとの間には、内槽ドーム３２の回りに少なくとも３つの支持機構５が配置されている。これらの支持機構５は、ドーム間相対位置（内槽ドーム３２の径方向における内槽ドーム３２と外槽ドーム４２の相対位置）を拘束するためのものである。本実施形態では、支持機構５が４つ設けられている。支持機構５は、内槽ドーム３２の中心軸３６から内槽本体部３１の軸方向Ｄに対して４５度の角度方向に配置されている。ただし、支持機構５の角度間隔は、必ずしも均等である必要はなく、不均等であってもよい。 Furthermore, at least three support mechanisms 5 are arranged around the inner tank dome 32 between the peripheral wall 33 of the inner tank dome 32 and the root portion 43A of the peripheral wall 43 of the outer tank dome 42. These support mechanisms 5 are for restraining relative positions between the domes (relative positions of the inner tank dome 32 and the outer tank dome 42 in the radial direction of the inner tank dome 32). In the present embodiment, four support mechanisms 5 are provided. The support mechanism 5 is disposed at an angle of 45 degrees with respect to the axial direction D of the inner tank main body 31 from the central axis 36 of the inner tank dome 32. However, the angular intervals of the support mechanism 5 do not necessarily have to be equal, and may be uneven.

　本実施形態では、各支持機構５が、外槽ドーム４２に固定された一対の第１支持部材６と、内槽ドーム３２に固定された１つの第２支持部材７を含む。第２支持部材７は、内槽ドーム３２の中心軸３６を含む基準面５０（すなわち、内槽ドーム３２の軸方向および径方向で規定される面）上に位置しており、第１支持部材６は、第２支持部材７の両側に配置されている。 In the present embodiment, each support mechanism 5 includes a pair of first support members 6 fixed to the outer tank dome 42 and one second support member 7 fixed to the inner tank dome 32. The second support member 7 is located on a reference surface 50 including the central axis 36 of the inner tank dome 32 (that is, a surface defined by the axial direction and the radial direction of the inner tank dome 32), and the first support member 6 is disposed on both sides of the second support member 7.

　各第１支持部材６は、第２支持部材７側に、基準面５０と平行な第１支持面６１を有している。第２支持部材７は、第１支持面６１と対向する一対の第２支持面７１を有している。本実施形態では、各第１支持部材６が、第１支持面６１を一方の主面とする板であり、第２支持部材７が、第２支持面７１を一方の主面および他方の主面とする板である。ただし、各第１支持部材６は、必ずしも板である必要はなく、第１支持面６１を有する限りどのような形状であってもよい。ただし、第１支持部材６および第２支持部材７が板であれば、それらを安価に作製することができる。 Each first support member 6 has a first support surface 61 parallel to the reference surface 50 on the second support member 7 side. The second support member 7 has a pair of second support surfaces 71 facing the first support surface 61. In the present embodiment, each first support member 6 is a plate having the first support surface 61 as one main surface, and the second support member 7 uses the second support surface 71 as one main surface and the other main surface. It is a board used as a surface. However, each first support member 6 is not necessarily a plate and may have any shape as long as it has the first support surface 61. However, if the first support member 6 and the second support member 7 are plates, they can be manufactured at low cost.

　第２支持部材７は、内槽ドーム３２の周壁３３から径方向外向きに突出している。つまり、第２支持面７１は基準面５０と平行である。支持機構５が存する位置では、内槽ドーム３２の周壁３３にダブリング板３５が接合されており、第２支持部材７はダブリング板３５を介して周壁３３に固定されている。ただし、ダブリング板３５が省略されて、第２支持部材７が周壁３３に直接固定されてもよい。一方、各第１支持部材６は、外槽ドーム４２の周壁４３の根元部４３Ａに固定されており、根元部４３Ａから内槽ドーム３２の周壁３３に向かって第２支持部材７と平行に突出している。 The second support member 7 protrudes radially outward from the peripheral wall 33 of the inner tank dome 32. That is, the second support surface 71 is parallel to the reference surface 50. At the position where the support mechanism 5 exists, a doubling plate 35 is joined to the peripheral wall 33 of the inner tank dome 32, and the second support member 7 is fixed to the peripheral wall 33 via the doubling plate 35. However, the doubling plate 35 may be omitted, and the second support member 7 may be directly fixed to the peripheral wall 33. On the other hand, each first support member 6 is fixed to the base portion 43A of the peripheral wall 43 of the outer tank dome 42, and protrudes in parallel with the second support member 7 from the base portion 43A toward the peripheral wall 33 of the inner tank dome 32. ing.

　より詳しくは、図４および図５（ｂ）に示すように、各第１支持部材６の第１支持面６１と反対側の主面（外側主面）の先端には、内槽ドーム３２の軸方向に延びる補強板６２が第１支持面６１と垂直に接合されており、補強板６２と根元部４３Ａの間には、第１支持部材６の外側主面の上端および下端に接続されたリブ６３が設けられている。 More specifically, as shown in FIGS. 4 and 5B, the inner tank dome 32 is provided at the tip of the main surface (outer main surface) opposite to the first support surface 61 of each first support member 6. A reinforcing plate 62 extending in the axial direction is joined perpendicularly to the first support surface 61, and is connected to the upper end and the lower end of the outer main surface of the first support member 6 between the reinforcing plate 62 and the root portion 43A. Ribs 63 are provided.

　一方、図４および図５（ａ）に示すように、第２支持部材７の各第２支持面７１の先端には、内槽ドーム３２の軸方向に延びる補強板７２が第２支持面７１と垂直に接合されており、補強板７２とダブリング板３５の間には、第２支持面７１の上端および下端に接続されたリブ７３が設けられている。 On the other hand, as shown in FIGS. 4 and 5A, a reinforcing plate 72 extending in the axial direction of the inner tank dome 32 is provided at the tip of each second support surface 71 of the second support member 7. Ribs 73 connected to the upper and lower ends of the second support surface 71 are provided between the reinforcing plate 72 and the doubling plate 35.

　第１支持面６１と各第２支持面７１の間には、断熱部材５５が介在している。本実施形態では、断熱部材５５が基準面５０と直交する方向に延びる管状である。なお、断熱部材５５の軸方向は、必ずしも基準面５０と直交する方向と平行である必要はなく、基準面と直交する方向に対して多少傾いていてもよい。管状の断熱部材５５の断面形状は、円形状であってもよいし、多角形状であってもよい。 A heat insulating member 55 is interposed between the first support surface 61 and each second support surface 71. In the present embodiment, the heat insulating member 55 has a tubular shape extending in a direction orthogonal to the reference surface 50. The axial direction of the heat insulating member 55 does not necessarily have to be parallel to the direction orthogonal to the reference plane 50, and may be slightly inclined with respect to the direction orthogonal to the reference plane. The cross-sectional shape of the tubular heat insulating member 55 may be circular or polygonal.

　本実施形態では、管状の断熱部材５５が、ガラス繊維強化プラスチック（ＧＦＲＰ）からなる。ただし、管状の断熱部材５５を構成する材料は、炭素繊維強化プラスチック（ＣＦＲＰ）や他のＦＲＰ（例えば、布強化フェノール樹脂）であってもよいし、金属であってもよい。 In the present embodiment, the tubular heat insulating member 55 is made of glass fiber reinforced plastic (GFRP). However, the material constituting the tubular heat insulating member 55 may be carbon fiber reinforced plastic (CFRP), other FRP (for example, cloth reinforced phenol resin), or metal.

　管状の断熱部材５５の一端および他端は、第１保持部材８Ａおよび第２保持部材８Ｂによってそれぞれ保持されている。そして、断熱部材５５は、第１保持部材８Ａを介して第１支持面６１に当接しており、第２保持部材８Ｂを介して第２支持面７１に固定されている。そして、断熱部材５５は、第１保持部材８Ａと共に、第１支持面６１に沿って摺動する。以前に参照した図３は、支持機構５を模式的に示す図であり、断熱部材５５が第１支持面６１に沿って摺動することをそれらの間の隙間で表している（図３では、リブ６３，７３を二点鎖線で示すとともに、保持部材８Ａ，８Ｂを省略）。 One end and the other end of the tubular heat insulating member 55 are respectively held by the first holding member 8A and the second holding member 8B. The heat insulating member 55 is in contact with the first support surface 61 via the first holding member 8A, and is fixed to the second support surface 71 via the second holding member 8B. The heat insulating member 55 slides along the first support surface 61 together with the first holding member 8A. FIG. 3 referred to before is a diagram schematically showing the support mechanism 5, and that the heat insulating member 55 slides along the first support surface 61 is represented by a gap between them (in FIG. 3). The ribs 63 and 73 are indicated by two-dot chain lines, and the holding members 8A and 8B are omitted).

　なお、内槽３内に液化ガスが投入されたときには、第２支持部材７、第２保持部材８Ｂおよび断熱部材５５が低温となって熱収縮し、第１保持部材８Ａと第１支持面６１との間に隙間が形成されることもある。すなわち、「摺動」は、２つの物体が物理的に接触した状態での相対的な移動だけでなく、非接触状態での相対的な移動をも意味する。 When the liquefied gas is introduced into the inner tank 3, the second support member 7, the second holding member 8B, and the heat insulating member 55 are thermally contracted at a low temperature, and the first holding member 8A and the first support surface 61 are heated. A gap may be formed between the two. That is, “sliding” means not only a relative movement in a state where two objects are in physical contact but also a relative movement in a non-contact state.

　本実施形態では、第１保持部材８Ａおよび第２保持部材８Ｂのそれぞれが、管状の断熱部材５５が内部に挿入される形状を有している。具体的に、各保持部材は、管状の断熱部材５５と嵌り合う筒状部８２と、管状の断熱部材５５の端面と当接する底部８１を含む。本実施形態では、底部８１の中央に開口が設けられているが、開口は設けられていなくてもよい。筒状部８２はピン５６により断熱部材５５と結合されている。ただし、各保持部材は当該保持部材が管状の断熱部材５５の内部に挿入される形状を有していてもよい。また各保持部材と断熱部材５５とはビスやリベットなどにより結合されていてもよい。 In the present embodiment, each of the first holding member 8A and the second holding member 8B has a shape in which the tubular heat insulating member 55 is inserted. Specifically, each holding member includes a tubular portion 82 that fits with the tubular heat insulating member 55, and a bottom portion 81 that abuts against an end surface of the tubular heat insulating member 55. In the present embodiment, an opening is provided in the center of the bottom 81, but the opening may not be provided. The cylindrical portion 82 is coupled to the heat insulating member 55 by a pin 56. However, each holding member may have a shape in which the holding member is inserted into the tubular heat insulating member 55. Further, each holding member and the heat insulating member 55 may be coupled by screws, rivets or the like.

　第１保持部材８Ａと第１支持面６１との間には、潤滑ライナー５１が挟まれている。潤滑ライナー５１の厚さは特に限定されず、潤滑ライナー５１は薄くても厚くてもよい。潤滑ライナー５１は、例えばビスにより第１支持面６１に固定される。ただし、潤滑ライナー５１は、第１保持部材８Ａに固定されてもよい。潤滑ライナー５１は、摺動性の良好な材料（例えば、フッ素樹脂、二硫化モリブテン）からなる。 The lubricating liner 51 is sandwiched between the first holding member 8A and the first support surface 61. The thickness of the lubricating liner 51 is not particularly limited, and the lubricating liner 51 may be thin or thick. The lubricating liner 51 is fixed to the first support surface 61 with, for example, screws. However, the lubricating liner 51 may be fixed to the first holding member 8A. The lubrication liner 51 is made of a material having good slidability (for example, fluororesin, molybdenum disulfide).

　以上説明したように、本実施形態の舶用二重殻タンク２Ａでは、内槽ドーム３２の回りに少なくとも３つの支持機構５が配置され、各支持機構５に含まれる断熱部材５５が基準面５０と平行な方向に移動可能であるので、内槽ドーム３２の軸方向および径方向への熱収縮を許容しながらドーム間相対位置（内槽ドーム３２の径方向における内槽ドーム３２と外槽ドーム４２の相対位置）を拘束することができる。 As described above, in the marine double-shell tank 2A of the present embodiment, at least three support mechanisms 5 are arranged around the inner tank dome 32, and the heat insulating member 55 included in each support mechanism 5 is connected to the reference surface 50. Since the inner tank dome 32 can move in parallel directions, the relative position between the domes (the inner tank dome 32 and the outer tank dome 42 in the radial direction of the inner tank dome 32 is allowed while allowing thermal contraction in the axial direction and the radial direction of the inner tank dome 32. Relative position) can be constrained.

　しかも、本実施形態では、断熱部材５５がＧＦＲＰからなっているので、断熱部材５５を介した熱侵入をいっそう抑制することができる。 In addition, in this embodiment, since the heat insulating member 55 is made of GFRP, it is possible to further suppress the heat intrusion through the heat insulating member 55.

　また、各支持機構５では、一対の第１支持部材６が第２支持部材７の両側に配置されているので、各支持機構５単体で、内槽ドーム３２を周方向に拘束することができる。 Moreover, in each support mechanism 5, since a pair of 1st support member 6 is arrange | positioned on the both sides of the 2nd support member 7, each support mechanism 5 single-piece | unit can restrain the inner tank dome 32 in the circumferential direction. .

　さらに、内槽３と外槽４の間の空間２０は真空空間であるので、長時間に亘り液化ガスを低温に維持することができる。 Furthermore, since the space 20 between the inner tank 3 and the outer tank 4 is a vacuum space, the liquefied gas can be maintained at a low temperature for a long time.

　＜変形例＞
　以下、第１実施形態の変形例を説明するが、以下の変形例は、２番目の変形例を除いて、後述する第２および第３実施形態の変形例としても適用可能である。 <Modification>
Hereinafter, although the modification of 1st Embodiment is demonstrated, the following modifications are applicable also as a modification of the 2nd and 3rd embodiment mentioned later except the 2nd modification.

　内槽本体部３１の軸方向Ｄおよび幅方向を前後方向および左右方向としたときに、４つの支持機構５は、内槽ドーム３２の中心軸３６から前後に２つ、左右に２つ配置されていてもよい。ただし、この場合には、内槽本体部３１の上面は前後方向にはストレートであるが左右方向には屈曲しているために、内槽本体部３１から左右の支持機構５までの距離が内槽本体部３１から前後の支持機構５までの距離より長くなる。これに対し、前記実施形態のようなレイアウトであれば、内槽本体部３１から全ての支持機構５までの距離が同じとなるため、全ての支持機構５に作用する荷重を均一化することができる。 When the axial direction D and the width direction of the inner tank main body 31 are the front-rear direction and the left-right direction, the four support mechanisms 5 are arranged two from the center axis 36 of the inner tank dome 32 in the front-rear direction and two in the left-right direction. It may be. However, in this case, since the upper surface of the inner tank body 31 is straight in the front-rear direction but is bent in the left-right direction, the distance from the inner tank body 31 to the left and right support mechanisms 5 is the inner distance. The distance is longer than the distance from the tank body 31 to the front and rear support mechanisms 5. On the other hand, since the distance from the inner tank main-body part 31 to all the support mechanisms 5 will become the same if it is a layout like the said embodiment, the load which acts on all the support mechanisms 5 can be equalize | homogenized. it can.

　図６に示す変形例の舶用二重殻タンク２Ｂのように、各支持機構５は、内槽ドーム３２に固定された、基準面５０上に位置する１つの第１支持部材６と、外槽ドーム４２に固定された、第１支持部材６の両側に配置された一対の第２支持部材７を含んでもよい。この場合、各第２支持部材７は、必ずしも板である必要はなく、第２支持面７１を有する限りどのような形状であってもよい。ただし、前記実施形態のように、第１支持部材６が外槽４に固定され、第２支持部材７が内槽３に固定されていれば、第１支持面６１がほぼ常温に保たれるために、断熱部材５５と第１支持面６１との間の摺動性能を常温状態で設計することができる。 Like the marine double shell tank 2B of the modification shown in FIG. 6, each support mechanism 5 is fixed to the inner tank dome 32, one first support member 6 positioned on the reference plane 50, and the outer tank. A pair of second support members 7 fixed on the dome 42 and disposed on both sides of the first support member 6 may be included. In this case, each second support member 7 is not necessarily a plate, and may have any shape as long as it has the second support surface 71. However, if the 1st support member 6 is being fixed to the outer tank 4 and the 2nd support member 7 is being fixed to the inner tank 3 like the said embodiment, the 1st support surface 61 will be maintained at substantially normal temperature. Therefore, the sliding performance between the heat insulating member 55 and the first support surface 61 can be designed in a normal temperature state.

　第２支持部材７の第２支持面７１は、必ずしも基準面５０と平行である必要はない。例えば、断熱部材５５の端部が斜めにカットされている場合は、第２支持面７１が断熱部材５５の端部に沿うように基準面５０に対して傾斜していてもよい。この場合、基準面５０上に位置する第２支持部材７は、当該第２支持部材７の少なくとも一部を基準面５０が通るように配置されていればよい。 The second support surface 71 of the second support member 7 does not necessarily have to be parallel to the reference surface 50. For example, when the end portion of the heat insulating member 55 is cut obliquely, the second support surface 71 may be inclined with respect to the reference surface 50 so as to be along the end portion of the heat insulating member 55. In this case, the second support member 7 positioned on the reference surface 50 may be disposed so that the reference surface 50 passes through at least a part of the second support member 7.

　断熱部材５５は、中実のブロックであってもよい。ただし、前記実施形態のように断熱部材５５が管状であれば、断熱部材５５を介した外槽４外から内槽３内への熱侵入を抑制することができる。なお、断熱部材５５が中実のブロックである場合は、断熱部材５５を直接的に第２支持面７１に固定するとともに、第１支持面６１に対して直接的に摺動させてもよい。 The heat insulating member 55 may be a solid block. However, if the heat insulating member 55 is tubular as in the above-described embodiment, heat intrusion from the outer tank 4 to the inner tank 3 through the heat insulating member 55 can be suppressed. When the heat insulating member 55 is a solid block, the heat insulating member 55 may be directly fixed to the second support surface 71 and slid directly with respect to the first support surface 61.

　管状の断熱部材５５の両端にフランジを設けた場合には、断熱部材５５を直接的に第２支持面７１に固定するとともに、第１支持面６１に対して直接的に摺動させることは可能である。ただし、前記実施形態のような構成であれば、第２保持部材８Ｂを用いて、シンプルな形状の管状の断熱部材５５の一端を簡単に第２支持面７１に固定することができる。また、管状の断熱部材５５の他端を保持する第１保持部材８Ａを第１支持面６１に大きな面積で接触させることができるため、管状の断熱部材５５を第１保持部材８Ａと共にスムーズに摺動させることができる。 When flanges are provided at both ends of the tubular heat insulating member 55, the heat insulating member 55 can be directly fixed to the second support surface 71 and can be slid directly with respect to the first support surface 61. It is. However, if it is a structure like the said embodiment, the end of the simple-shaped tubular heat insulation member 55 can be easily fixed to the 2nd support surface 71 using the 2nd holding member 8B. Further, since the first holding member 8A holding the other end of the tubular heat insulating member 55 can be brought into contact with the first support surface 61 in a large area, the tubular heat insulating member 55 can be smoothly slid together with the first holding member 8A. Can be moved.

　第１保持部材８Ａと第１支持面６１との間には必ずしも潤滑ライナー５１が挟まれている必要はない。例えば、第１保持部材８Ａを、摺動性の良好な樹脂で構成することも可能である。あるいは、第１保持部材８Ａを金属で構成した場合でも、第１保持部材８Ａが接する第１支持面６１上に潤滑材を塗布してもよい。ただし、前記実施形態のように第１保持部材８Ａと第１支持面６１との間に潤滑ライナー５１が挟まれていれば、簡易な構成で良好な摺動性を得ることができる。 The lubrication liner 51 is not necessarily sandwiched between the first holding member 8A and the first support surface 61. For example, the first holding member 8A can be made of a resin having good sliding properties. Alternatively, even when the first holding member 8A is made of metal, a lubricant may be applied on the first support surface 61 with which the first holding member 8A is in contact. However, if the lubricating liner 51 is sandwiched between the first holding member 8A and the first support surface 61 as in the above embodiment, good slidability can be obtained with a simple configuration.

　支持機構５は、内槽ドーム３２の周壁３３と外槽ドーム４２の周壁４３の先端部４３Ｂとの間に配置されていてもよい。この場合、断熱部材５５は内槽ドーム３２の中心軸３６と直交する方向にのみ摺動してもよい。 The support mechanism 5 may be disposed between the peripheral wall 33 of the inner tank dome 32 and the distal end portion 43B of the peripheral wall 43 of the outer tank dome 42. In this case, the heat insulating member 55 may slide only in the direction orthogonal to the central axis 36 of the inner tank dome 32.

　外槽ドーム４２の周壁４３には必ずしもベローズ管４５が組み込まれている必要はない。この場合、内槽３内に液化ガスが投入されて内槽本体部３１が熱収縮したときの内槽ドーム３２の軸方向への移動は、配管１３の撓みによって許容される。 The bellows tube 45 is not necessarily incorporated in the peripheral wall 43 of the outer tank dome 42. In this case, the movement of the inner tank dome 32 in the axial direction when the liquefied gas is introduced into the inner tank 3 and the inner tank main body 31 is thermally contracted is allowed by the bending of the pipe 13.

　（第２実施形態）
　次に、図７を参照して、本発明の第２実施形態に係る舶用二重殻タンク２Ｃを説明する。なお、本実施形態および後述する第３実施形態において、第１実施形態と同一構成要素には同一符号を付し、重複した説明は省略する。 (Second Embodiment)
Next, a marine double shell tank 2C according to a second embodiment of the present invention will be described with reference to FIG. In the present embodiment and the third embodiment to be described later, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

　本実施形態では、各支持機構５が、外槽ドーム４２に固定された１つの第１支持部材６と、内槽ドーム３２に固定された一対の第２支持部材７を含む。一対の第２支持部材７は、第１支持部材６の両側に配置されており、内槽ドーム３２の中心軸３６を含む基準面５０上に位置している。各第２支持部材７は、内槽ドーム３２の周壁３３から径方向外向きに突出する板であり、基準面５０と平行な第２支持面７１を有している。一方、第１支持部材６は、内槽ドーム３２の軸方向から見たときに略台形状をなしており、基準面５０と平行な一対の第１支持面６１を有している。管状の断熱部材５５が第１保持部材８Ａを介して第１支持面６１に当接しており、第２保持部材８Ｂを介して第２支持面７１に固定されている点は、第１実施形態と同様である。 In this embodiment, each support mechanism 5 includes one first support member 6 fixed to the outer tank dome 42 and a pair of second support members 7 fixed to the inner tank dome 32. The pair of second support members 7 are disposed on both sides of the first support member 6 and are located on a reference surface 50 including the central axis 36 of the inner tank dome 32. Each second support member 7 is a plate that protrudes radially outward from the peripheral wall 33 of the inner tank dome 32, and has a second support surface 71 parallel to the reference surface 50. On the other hand, the first support member 6 has a substantially trapezoidal shape when viewed from the axial direction of the inner tank dome 32, and has a pair of first support surfaces 61 parallel to the reference surface 50. The tubular heat insulating member 55 is in contact with the first support surface 61 via the first holding member 8A, and is fixed to the second support surface 71 via the second holding member 8B. It is the same.

　本実施形態でも、第１実施形態と同様の効果を得ることができる。 Also in this embodiment, the same effect as in the first embodiment can be obtained.

　なお、図示は省略するが、各支持機構５は、内槽ドーム３２に固定された、基準面５０上に位置する一対の第１支持部材６と、外槽ドーム４２に固定された、第１支持部材６の間に配置された１つの第２支持部材７（内槽ドーム３２の軸方向から見たときに略台形状）と、を含んでもよい。この場合、各第１支持部材６は、必ずしも板である必要はなく、第１支持面６１を有する限りどのような形状であってもよい。ただし、前記実施形態のように、第１支持部材６が外槽４に固定され、第２支持部材７が内槽３に固定されていれば、第１支持面６１がほぼ常温に保たれるために、断熱部材５５と第１支持面６１との間の摺動性能を常温状態で設計することができる。 In addition, although illustration is abbreviate | omitted, each support mechanism 5 is fixed to the inner tank dome 32, the 1st support member 6 located on the reference plane 50, and the 1st fixed to the outer tank dome 42, One second support member 7 (substantially trapezoidal when viewed from the axial direction of the inner tank dome 32) disposed between the support members 6 may be included. In this case, each first support member 6 is not necessarily a plate, and may have any shape as long as it has the first support surface 61. However, if the 1st support member 6 is being fixed to the outer tank 4 and the 2nd support member 7 is being fixed to the inner tank 3 like the said embodiment, the 1st support surface 61 will be maintained at substantially normal temperature. Therefore, the sliding performance between the heat insulating member 55 and the first support surface 61 can be designed in a normal temperature state.

　（第３実施形態）
　次に、図８を参照して、本発明の第３実施形態に係る舶用二重殻タンク２Ｄを説明する。 (Third embodiment)
Next, a marine double shell tank 2D according to a third embodiment of the present invention will be described with reference to FIG.

　本実施形態では、各支持機構５が、外槽ドーム４２に固定された１つの第１支持部材６と、内槽ドーム３２に固定された、基準面５０上に位置する１つの第２支持部材７を含む。このため、支持機構５は交互に勝手反対になっている。換言すれば、隣り合う支持機構５同士で第１支持部材６と第２支持部材７との位置関係が逆になっている。管状の断熱部材５５が第１保持部材８Ａを介して第１支持面６１に当接しており、第２保持部材８Ｂを介して第２支持面７１に固定されている点は、第１実施形態と同様である。なお、第１支持部材６は、必ずしも板である必要はなく、第１支持面６１を有する限りどのような形状であってもよい。同様に、第２支持部材７は、必ずしも板である必要はなく、第２支持面７１を有する限りどのような形状であってもよい。 In the present embodiment, each support mechanism 5 has one first support member 6 fixed to the outer tank dome 42 and one second support member positioned on the reference surface 50 fixed to the inner tank dome 32. 7 is included. For this reason, the support mechanisms 5 are alternately opposite. In other words, the positional relationship between the first support member 6 and the second support member 7 is reversed between the adjacent support mechanisms 5. The tubular heat insulating member 55 is in contact with the first support surface 61 via the first holding member 8A, and is fixed to the second support surface 71 via the second holding member 8B. It is the same. The first support member 6 is not necessarily a plate and may have any shape as long as the first support surface 61 is provided. Similarly, the second support member 7 is not necessarily a plate, and may have any shape as long as the second support surface 71 is provided.

　本実施形態でも、第１実施形態と同様の効果を得ることができる。さらに、本実施形態では、ドーム間相対位置を拘束し、かつ、内槽ドーム３２を周方向に拘束しつつ、各支持機構５を簡素な構造とできるとともに、支持機構５間の位置調整が容易となる。なお、本実施形態では、対称性を確保するために、支持機構５の数は偶数であることが望ましい。支持機構５の数が偶数であれば、全ての隣り合う支持機構５同士で（例えば、支持機構５の数が４つであれば、４組の隣り合う支持機構５同士で）第１支持部材６と第２支持部材７との位置関係が逆になる。一方、支持機構５の数が奇数であれば、１組の隣り合う支持機構５を除いて隣り合う支持機構５同士で（例えば、支持機構５の数が５つであれば、４組の隣り合う支持機構５同士で）第１支持部材６と第２支持部材７との位置関係が逆になる。 Also in this embodiment, the same effect as in the first embodiment can be obtained. Furthermore, in this embodiment, while restraining the relative position between the domes and restraining the inner tank dome 32 in the circumferential direction, each support mechanism 5 can have a simple structure, and position adjustment between the support mechanisms 5 is easy. It becomes. In the present embodiment, the number of support mechanisms 5 is desirably an even number in order to ensure symmetry. If the number of the support mechanisms 5 is an even number, the first support member is composed of all the adjacent support mechanisms 5 (for example, if the number of the support mechanisms 5 is four, the four pairs of adjacent support mechanisms 5). The positional relationship between 6 and the second support member 7 is reversed. On the other hand, if the number of support mechanisms 5 is an odd number, the adjacent support mechanisms 5 except for one set of adjacent support mechanisms 5 (for example, if the number of the support mechanisms 5 is 5, four sets of adjacent The positional relationship between the first support member 6 and the second support member 7 is reversed (with matching support mechanisms 5).

　なお、図示は省略するが、各支持機構５は、内槽ドーム３２に固定された、基準面５０上に位置する１つの第１支持部材６と、外槽ドーム４２に固定された１つの第２支持部材７を含んでもよい。ただし、前記実施形態のように、第１支持部材６が外槽４に固定され、第２支持部材７が内槽３に固定されていれば、第１支持面６１がほぼ常温に保たれるために、断熱部材５５と第１支持面６１との間の摺動性能を常温状態で設計することができる。 Although not shown, each support mechanism 5 includes one first support member 6 fixed on the inner tank dome 32 and positioned on the reference surface 50 and one first support member fixed on the outer tank dome 42. Two support members 7 may be included. However, if the 1st support member 6 is being fixed to the outer tank 4 and the 2nd support member 7 is being fixed to the inner tank 3 like the said embodiment, the 1st support surface 61 will be maintained at substantially normal temperature. Therefore, the sliding performance between the heat insulating member 55 and the first support surface 61 can be designed in a normal temperature state.

　また、支持機構５は、必ずしも交互に勝手反対になっている必要はない。例えば、支持機構５の数が４つ以上である場合には、少なくとも４組の隣り合う支持機構５同士で第１支持部材６と第２支持部材７との位置関係が逆になっていれば、ドーム間相対位置を拘束し、かつ、内槽ドーム３２を周方向に拘束しつつ、各支持機構５を簡素な構造とできる。例えば、支持機構５の数が６つであり、支持機構５を向きの違いによってＡとＢとに分類した場合、周方向に、Ａ１→Ａ２→Ｂ１→Ａ３→Ｂ２→Ｂ３→（Ａ１）と並んでいてもよい。この場合、４組の隣り合う支持機構５同士で（Ａ２とＢ１、Ｂ１とＡ３、Ａ３とＢ２、Ｂ３とＡ１）、第１支持部材６と第２支持部材７との位置関係が逆になる。 Also, the support mechanism 5 does not necessarily have to be alternately opposite. For example, when the number of support mechanisms 5 is four or more, the positional relationship between the first support member 6 and the second support member 7 is reversed between at least four adjacent support mechanisms 5. Each support mechanism 5 can have a simple structure while restraining the relative position between the domes and restraining the inner tank dome 32 in the circumferential direction. For example, when the number of support mechanisms 5 is six and the support mechanisms 5 are classified into A and B according to the difference in orientation, A1 → A2 → B1 → A3 → B2 → B3 → (A1) in the circumferential direction. You may line up. In this case, the positional relationship between the first support member 6 and the second support member 7 is reversed between the four pairs of adjacent support mechanisms 5 (A2 and B1, B1 and A3, A3 and B2, B3 and A1). .

　（その他の実施形態）
　本発明は上述した第１～第３実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変形が可能である。 (Other embodiments)
The present invention is not limited to the first to third embodiments described above, and various modifications can be made without departing from the scope of the present invention.

　例えば、支持機構５は、必ずしも内槽ドーム３２と外槽ドーム４２の間に配置されている必要はなく、内槽本体部３１と外槽本体部４１との間に配置されていてもよい。つまり、第１支持部材６が内槽本体部３１と外槽本体部４１の一方に固定され、第２支持部材７が内槽本体部３１と外槽本体部４１の他方に固定されていてもよい。この場合、第１支持部材６と第２支持部材７のうちの内槽本体部３１に固定される方が基準面５０上に位置する。 For example, the support mechanism 5 is not necessarily disposed between the inner tank dome 32 and the outer tank dome 42, and may be disposed between the inner tank body 31 and the outer tank body 41. That is, even if the first support member 6 is fixed to one of the inner tank main body 31 and the outer tank main body 41, and the second support member 7 is fixed to the other of the inner tank main body 31 and the outer tank main body 41. Good. In this case, the one of the first support member 6 and the second support member 7 that is fixed to the inner tank main body 31 is located on the reference surface 50.

　また、全ての支持機構５は、必ずしも同じ高さ位置に配置されている必要はなく、例えば、交互に上下にずれるように配置されていてもよい。 Further, all the support mechanisms 5 do not necessarily have to be arranged at the same height position, and may be arranged so as to be alternately shifted up and down, for example.

　１　　船舶
　２Ａ～２Ｄ　舶用二重殻タンク
　３　　内槽
　３１　内槽本体部
　３２　内槽ドーム
　３６　中心軸
　４　　外槽
　４１　外槽本体部
　４２　外槽ドーム
　５　　支持機構
　５０　基準面
　５１　潤滑ライナー
　５５　断熱部材
　６　　第１支持部材
　６１　第１支持面
　７　　第２支持部材
　７１　第２支持面
　８Ａ　第１保持部材
　８Ｂ　第２保持部材 DESCRIPTION OF SYMBOLS 1 Ship 2A-2D Marine double shell tank 3 Inner tank 31 Inner tank main-body part 32 Inner tank dome 36 Center axis | shaft 4 Outer tank 41 Outer tank main-body part 42 Outer tank dome 5 Support mechanism 50 Reference surface 51 Lubrication liner 55 Thermal insulation member 6 First support member 61 First support surface 7 Second support member 71 Second support surface 8A First holding member 8B Second holding member

Claims (13)

　液化ガスを貯留する内槽本体部および前記内槽本体部から上向きに突出する内槽ドームを含む内槽と、
　前記内槽本体部を取り囲む外槽本体部および前記内槽ドームを取り囲む外槽ドームを含む外槽と、
　前記内槽と前記外槽との間で、前記内槽ドームの回りに配置された少なくとも３つの支持機構と、を備え、
　前記支持機構のそれぞれは、
　　前記内槽と前記外槽の一方に固定された、前記内槽ドームの中心軸を含む基準面と平行な第１支持面を有する第１支持部材と、
　　前記内槽と前記外槽の他方に固定された、前記第１支持面と対向する第２支持面を有する第２支持部材と、
　　前記第１支持面と前記第２支持面との間に介在する、前記第２支持面に固定され、前記第１支持面に沿って摺動する断熱部材と、を含み、
　前記第１支持部材と前記第２支持部材のうちの前記内槽に固定される方は、前記基準面上に位置する、舶用二重殻タンク。 An inner tank containing an inner tank main body for storing liquefied gas and an inner tank dome protruding upward from the inner tank main body; and
An outer tank including an outer tank main body that surrounds the inner tank main body and an outer tank dome that surrounds the inner tank dome;
Between the inner tank and the outer tank, and at least three support mechanisms arranged around the inner tank dome,
Each of the support mechanisms is
A first support member having a first support surface fixed to one of the inner tub and the outer tub and parallel to a reference surface including a central axis of the inner tub dome;
A second support member having a second support surface fixed to the other of the inner tank and the outer tank and facing the first support surface;
A heat insulating member interposed between the first support surface and the second support surface, fixed to the second support surface, and slid along the first support surface,
One of the first support member and the second support member that is fixed to the inner tank is a marine double-shell tank that is located on the reference plane. 　前記第１支持部材は、前記第１支持面を一方の主面とする板であり、
　前記第２支持部材は、前記第２支持面を一方の主面とする板である、請求項１に記載の舶用二重殻タンク。 The first support member is a plate having the first support surface as one main surface,
The marine double-shell tank according to claim 1, wherein the second support member is a plate having the second support surface as one main surface. 　前記第１支持部材は、前記外槽ドームまたは前記外槽本体部に固定されており、
　前記第２支持部材は、前記内槽ドームまたは前記内槽本体部に固定されている、請求項１または２に記載の舶用二重殻タンク。 The first support member is fixed to the outer tub dome or the outer tub main body,
The marine double shell tank according to claim 1 or 2, wherein the second support member is fixed to the inner tank dome or the inner tank main body. 　前記断熱部材は、前記基準面と直交する方向に延びる管状である、請求項１～３のいずれか一項に記載の舶用二重殻タンク。 The marine double-shell tank according to any one of claims 1 to 3, wherein the heat insulating member has a tubular shape extending in a direction perpendicular to the reference plane. 　前記支持機構のそれぞれは、前記管状の断熱部材の一端および他端をそれぞれ保持する第１保持部材および第２保持部材を含み、
　前記管状の断熱部材は、前記第１保持部材を介して前記第１支持面に当接しており、前記第２保持部材を介して前記第２支持面に固定されている、請求項４に記載の舶用二重殻タンク。 Each of the support mechanisms includes a first holding member and a second holding member that respectively hold one end and the other end of the tubular heat insulating member,
The tubular heat insulating member is in contact with the first support surface via the first holding member, and is fixed to the second support surface via the second holding member. Marine double shell tank. 　前記第１保持部材と前記第１支持面との間には、潤滑ライナーが挟まれている、請求項５に記載の舶用二重殻タンク。 The marine double-shell tank according to claim 5, wherein a lubricating liner is sandwiched between the first holding member and the first support surface. 　前記断熱部材は、ガラス繊維強化プラスチックからなる、請求項１～６のいずれか一項に記載の舶用二重殻タンク。 The marine double-shell tank according to any one of claims 1 to 6, wherein the heat insulating member is made of glass fiber reinforced plastic. 　前記第２支持部材は、前記第２支持面を一方の主面および他方の主面とする板であり、
　前記第１支持部材は、一対設けられていて、前記第２支持部材の両側に配置されている、請求項１～７のいずれか一項に記載の舶用二重殻タンク。 The second support member is a plate having the second support surface as one main surface and the other main surface,
The marine double-shell tank according to any one of claims 1 to 7, wherein a pair of the first support members are provided and arranged on both sides of the second support member. 　前記支持機構のそれぞれは、前記第１支持部材および前記第２支持部材を１つずつ含み、
　隣り合う前記支持機構同士で前記第１支持部材と前記第２支持部材との位置関係が逆になっている、請求項１～７のいずれか一項に記載の舶用二重殻タンク。 Each of the support mechanisms includes the first support member and the second support member one by one,
The marine double-shell tank according to any one of claims 1 to 7, wherein a positional relationship between the first support member and the second support member is reversed between adjacent support mechanisms. 　前記支持機構のそれぞれは、前記第１支持部材および前記第２支持部材を１つずつ含み、
　前記支持機構の数は４つ以上であり、少なくとも４組の隣り合う前記支持機構同士で前記第１支持部材と前記第２支持部材との位置関係が逆になっている、請求項１～７のいずれか一項に記載の舶用二重殻タンク。 Each of the support mechanisms includes the first support member and the second support member one by one,
The number of the support mechanisms is four or more, and the positional relationship between the first support member and the second support member is reversed between at least four pairs of adjacent support mechanisms. A marine double-shell tank according to any one of the above. 　前記内槽と前記外槽との間の空間は真空空間である、請求項１～１０のいずれか一項に記載の舶用二重殻タンク。 The marine double-shell tank according to any one of claims 1 to 10, wherein a space between the inner tank and the outer tank is a vacuum space. 　前記内槽本体部は、水平方向に延びる円筒状であり、
　４つの前記支持機構が、前記内槽ドームと前記外槽ドームの間で、前記内槽ドームの中心軸から前記内槽本体部の軸方向に対して４５度の角度方向に配置されている、請求項１～１１のいずれか一項に記載の舶用二重殻タンク。 The inner tub main body is a cylindrical shape extending in the horizontal direction,
The four support mechanisms are disposed between the inner tank dome and the outer tank dome at an angle of 45 degrees with respect to the axial direction of the inner tank main body from the central axis of the inner tank dome The marine double-shell tank according to any one of claims 1 to 11. 　請求項１～１２のいずれか一項に記載の舶用二重殻タンクを備える船舶。
  A marine vessel comprising the marine double-shell tank according to any one of claims 1 to 12.
PCT/JP2016/081095 2015-10-20 2016-10-20 Double-shell tank for ship, and ship Ceased WO2017069196A1 (en)

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CN201680061754.5A CN108137135B (en) 2015-10-20 2016-10-20 Marine double-shell storage tank and ship
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CN108137135A (en) 2018-06-08
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EP3366568B1 (en) 2022-04-13
EP3366568A4 (en) 2019-05-22
JPWO2017069196A1 (en) 2018-07-26
CN108137135B (en) 2020-04-07
KR20180070608A (en) 2018-06-26
KR102438162B1 (en) 2022-08-31

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