WO2014073240A1 - 円筒型タンクの構築方法 - Google Patents
円筒型タンクの構築方法 Download PDFInfo
- Publication number
- WO2014073240A1 WO2014073240A1 PCT/JP2013/067867 JP2013067867W WO2014073240A1 WO 2014073240 A1 WO2014073240 A1 WO 2014073240A1 JP 2013067867 W JP2013067867 W JP 2013067867W WO 2014073240 A1 WO2014073240 A1 WO 2014073240A1
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- WIPO (PCT)
- Prior art keywords
- tank
- side plate
- concrete
- jack
- roof
- Prior art date
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/04—Containers for fluids or gases; Supports therefor mainly of metal
- E04H7/06—Containers for fluids or gases; Supports therefor mainly of metal with vertical axis
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/163—Jacks specially adapted for working-up building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/10—Buildings forming part of cooling plants
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/04—Containers for fluids or gases; Supports therefor mainly of metal
- E04H7/06—Containers for fluids or gases; Supports therefor mainly of metal with vertical axis
- E04H7/065—Containers for fluids or gases; Supports therefor mainly of metal with vertical axis roof constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/18—Containers for fluids or gases; Supports therefor mainly of concrete, e.g. reinforced concrete, or other stone-like material
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/18—Containers for fluids or gases; Supports therefor mainly of concrete, e.g. reinforced concrete, or other stone-like material
- E04H7/20—Prestressed constructions
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- 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
- F17C2201/032—Orientation with substantially vertical main axis
Definitions
- the present invention relates to a method for constructing a cylindrical tank. This application claims priority based on Japanese Patent Application No. 2012-248554 for which it applied to Japan on November 12, 2012, and uses the content here.
- a cylindrical tank having a structure having an inner tank and an outer tank is used for storing low-temperature liquids such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas).
- Patent Document 1 discloses a method for constructing a cylindrical tank having a metal inner tank and a concrete outer tank.
- a base plate is first constructed, and steel liners (outer tank side plates) are sequentially stacked in layers and fixed by welding.
- steel liners outer tank side plates
- the outer mold is installed, and the concrete is cast using the steel liner as the inner mold to construct the side wall of the outer tub.
- the frame and deck of the outer tub roof are assembled and installed on the top of the outer tub side wall.
- concrete is placed on the outer tank roof, and finally the inner tank is assembled to construct a cylindrical tank having a function of keeping LNG and the like cold.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a cylindrical tank construction method capable of minimizing the amount of material required for construction while preventing buckling of the outer tank side plate.
- a first aspect according to the present invention is a method for constructing a cylindrical tank having a metal inner tub and a concrete outer tub, and is provided outside the bottom of the outer tub. While assembling the outer tub side plate in order from the lowest level to the uppermost level at the periphery, the side walls of the outer tub are assembled by placing concrete using the outer tub side plate as an inner mold following the assembly. Process.
- the outer tub side plate is assembled in order from the lowermost stage to the uppermost stage, and the concrete is cast using the outer tub side plate as the inner formwork following the assembly. Assembling the tank side plates and placing concrete is a parallel operation with a certain interval.
- the thickness of the outer tank side plate can be optimized to minimize the amount of material required for construction. It becomes.
- the second aspect according to the present invention is to alternately perform butt welding of the next outer tub side plate on the upper side of the outer tub side plate and placing the concrete up to a height including the butt welding portion.
- the butt welding of the outer tub side plate and the concrete placement are alternately performed, and the concrete is placed following the assembly of the outer tub side plate.
- the height of the outer tank side plate on which the concrete is not placed is suppressed to a certain range, and the welded portion of the outer tank side plate is sequentially covered with concrete. Can be prevented more reliably.
- the 3rd aspect which concerns on this invention has the process of providing the drain hole for draining water from between the said outer tank side plate and the said concrete in the base end part of the side wall of the said outer tank.
- a gap is created between the outer tub side plate and the concrete that can not be prevented due to drying shrinkage of the concrete, and in this gap until the outer tub roof is installed.
- water may accumulate due to precipitation during concrete pouring or rain.
- the flow of water can be managed appropriately and it can drain by providing a drain hole in the base end part of the side wall of an outer tank.
- the fourth aspect according to the present invention is to alternately repeat the rise of the inner tank side plate by the jack-up device and the attachment of the next inner tank side plate to the lower side of the raised inner tank side plate, A step of assembling the inner tank.
- the inner tank side plate is added at a low position by raising the inner tank side plate with the jack-up device and sequentially adding the inner tank side plate to the lower side. Therefore, it is possible to assemble the inner tank safely in a low place while avoiding interference with the roof portion of the outer tank held in the middle of the side wall of the outer tank.
- the fifth aspect according to the present invention includes a step of forming an opening in the outer tank side plate in advance, a step of attaching an anchor portion to which an anchor embedded in the concrete is connected, and the opening. Supporting the jack-up device via the anchor portion attached to the device.
- an anchor portion is attached to an opening provided in advance in the outer tub side plate, and integrated with the outer tub side plate. Let This eliminates the need to secure the strength to support the jack-up device by increasing the thickness of the outer tank side plate, etc., so securing the necessary anchor points while minimizing the thickness of the outer tank side plate Can do.
- annular stiffener which protruded inside the said outer tank side plate is provided.
- the stiffener is provided to reinforce the outer tank side plate separately from the concrete placement following the assembling of the outer tank side plate, so that the outer tank side plate is buckled by wind load. Can be prevented more reliably.
- the support pile 1 is driven into the ground, and a part of the foundation plate (the bottom of the outer tub) 2 is constructed thereon.
- a part of the foundation slab 2 constructed here is a ring-shaped annular part which is a part where the side wall of the tank stands.
- a PC wall (side wall of the outer tub) 3 is set up on the annular portion of the foundation plate 2 that was constructed in advance. Specifically, the PC wall 3 is raised by assembling the side liner (outer tank side plate) 4 on the foundation plate 2 and placing concrete 5 on the outside of the side liner 4.
- the side liner 4 is a steel liner and doubles as a concrete formwork.
- the side liner 4 is assembled in advance, the butt welding of the next side liner 4 to the upper side of the side liner 4, and the side liner.
- the PC wall 3 is assembled by alternately placing the concrete 5 using 4.
- the butt welding of the side liner 4 is preferably performed by one-side welding from the inside of the tank.
- backing butt welding using a backing metal indicated by reference numeral 4a in FIG. 3 is performed.
- the butt welding of the side liner 4 is one-side welding from the inside of the tank, so that interference with the concrete 5 placement work on the outside of the tank can be avoided.
- the side liner 4 is assembled in order from the lowermost stage to the uppermost stage, and the concrete 5 is placed with the side liner 4 as the inner mold (the outer mold is not shown) following the assembly. . Therefore, as shown by (a) to (c) in FIG. 3, the assembly of the side liner 4 and the placement of the concrete 5 are parallel operations with a certain interval. Thereby, the height of the protrusion part X of the side liner 4 which has not laid concrete 5 can be restrained in a certain fixed range. Since the protruding portion X is a portion that receives the wind load by the side liner 4 alone, buckling of the side liner 4 due to the wind load can be prevented by suppressing the protruding portion X within a certain range.
- the plate thickness and the like may be designed based on the wind load applied to the protruding portion X.
- the side liner 4 can be designed to have a plate thickness or the like that ensures a necessary minimum strength so that buckling does not occur due to wind load applied to the protruding portion X. Accordingly, the design of the side liner can be optimized to minimize the amount of material required for construction, and the cost can be reduced and the side liner 4 can be easily welded at a high location.
- the legged mount 9 is installed along the inside of the base end portion of the side liner 4.
- the outer tank roof (outer tank roof part) 10 is assembled on the roof frame 8 and the leg frame 9.
- the outer tank roof 10 is assembled by, for example, mounting an aerial work vehicle or the like on the base plate 2 and assembling a steel frame and mounting a roof block thereon. Since the outer tub roof 10 is assembled in a region other than the outer peripheral edge of the foundation plate 2 on which the PC wall 3 is assembled, the assembly of the PC wall 3 and the assembly of the outer tub roof 10 do not interfere with each other. Work can be performed simultaneously in parallel.
- the jack-up device 11 is then installed on the PC wall 3 being assembled as shown in FIG.
- a plurality of suspension-side jack mounts (suspension points) 12 are installed along the circumferential direction of the tank on the PC wall 3 above the base plate 2 and above the outer peripheral edge of the outer tub roof 10.
- the suspension side jack mount 12 is installed so as to protrude substantially horizontally from the PC wall 3 having a predetermined height toward the inside of the tank.
- the suspension side jack mount 12 is firmly and detachably fixed to an anchor plate (anchor portion) 13 embedded in the PC wall 3 shown in FIG.
- the anchor plate 13 has a strength superior to that of the side liner 4 by connecting a plurality of anchors 14 embedded in the concrete 5.
- the anchor plate 13 is installed by fitting the anchor plate 13 into an opening 15 formed in advance in the side liner 4 and integrating it with the side liner 4 by fillet welding or the like. That is, an appropriate position of the side liner 4 is partially constituted by the anchor plate 13, and the suspension side jack mount 12 is fixed to the anchor plate 13.
- the suspension-side jack mount 12 is fixed and the jack-up device 11 is supported through the anchor plate 13 that is attached to the opening 15 of the side liner 4 and has a partially increased support strength. ing.
- a plurality of suspended-side jack mounts 16 corresponding to the plurality of suspended-side jack mounts 12 are installed on the outer peripheral edge of the outer tub roof 10.
- the suspended-side jack mount 16 is installed so as to protrude substantially horizontally from the outer peripheral edge of the outer tank roof 10 toward the outside of the tank.
- the suspended-side jack mount 16 is detachably fixed to the outer peripheral edge of the outer tub roof 10.
- the suspended-side jack mount 16 may be installed above the outer tank roof 10 instead of below the outer tank roof 10 as shown in FIG.
- the jack-up device 11 is installed across the suspended side jack mount 12 and the suspended side jack mount 16.
- the jack-up device 11 is configured as a center hole jack, and has a cylindrical jack body 11 a suspended below the suspended-side jack mount 16, and a vertical stroke extending to the jack body 11 a. And a jack-up rod 17 which is held so as to be engaged with the suspension-side jack mount 12 via an equalizer 17a.
- a plurality of jackup devices 11 having the above-described configuration are installed at predetermined intervals along the circumferential direction of the tank.
- the roof mount 8 can be removed when the roof steel frame portion of the outer tub roof 10 is assembled, and when the jack-up device 11 is installed as described above, a part of the leg mount 9 can be removed. it can.
- the weight of the outer tub roof 10 is supported by a plurality of jack-up devices 11.
- the outer tank roof 10 assembled on the base plate 2 is raised by the jack-up device 11. Specifically, when the jack main body 11a is driven to rotate forward, the jack main body 11a rises along with the suspended-side jack mount 16 so as to be transmitted along the jack-up rod 17, and jacks up the outer tub roof 10 being assembled. . By jacking up the outer tank roof 10, the inner tank side plate 20 can be carried under the outer tank roof 10 and a work space for assembling the inner tank can be secured.
- the outer tank roof 10 raised by the jack-up device 11 is held on the PC wall 3.
- the outer tub roof 10 is held on the PC wall 3 via the holding frame 21 installed in the middle stage of the PC wall 3.
- the holding base 21 is installed so as to protrude substantially horizontally from the PC wall 3 having a predetermined height toward the inside of the tank.
- the holding frame 21 is firmly and detachably fixed to an anchor plate 13 as shown in FIG. 6 embedded in, for example, the PC wall 3 in advance.
- the suspension of the suspended side jack base 16 to the outer tank roof 10 is released.
- the weight of the outer tub roof 10 is supported by the holding rack 21.
- the jack body 11a is driven in reverse and lowered to the vicinity of the base plate 2. Then, the space below the outer tank roof 10 can be used for assembling the inner tank side plate 20.
- the suspended side jack mount 16 is separately attached to the inner tank side plate 20, the suspended side jack mount 16 of the outer tank roof 10 may be diverted.
- each inner tank side plate 20 is assembled cyclically
- the inner tank side plate 20 assembled here corresponds to the uppermost stage (the eighth stage in the present embodiment).
- a plurality of suspended side mounting stands 22 corresponding to the plurality of suspended side jack stands 16 are installed on the inner tank side plate 20 assembled in an annular shape.
- the suspended side mounting base 22 is installed so as to protrude substantially horizontally from the outer peripheral surface of the inner tank side plate 20 assembled in an annular shape toward the outside of the tank.
- the suspended-side jack mount 16 of the jack-up device 11 is detachably fixed to the suspended-side mounting mount 22.
- all or part of the weight of the inner tank side plate 20 assembled in an annular shape is supported by the jack-up device 11.
- the inner tank side plate 20 is assembled. Specifically, first, by jacking up the jackup device 11, the inner tank side plate 20 assembled in an annular shape is raised by an amount corresponding to the vertical width of the single inner tank side plate 20. Next, the next inner tank side plate 20 is carried into a space formed in the lower part of the inner tank side plate 20 by jacking up through a construction port (not shown) provided in the PC wall 3, and the inner tank side plate 20 is attached with legs. It is lowered onto the gantry 9 and is annularly arranged below the jacked up inner tank side plate 20.
- the inner tank side plates 20 are formed into an integral cylindrical shape.
- the inner tank side plates 20 may be welded together in the vertical direction after the inner tank side plates 20 are connected to each other in the lateral direction outside the tank in advance and formed into an annular shape. In this way, by connecting the plurality of inner tank side plates 20 to each other outside the PC wall 3 with a limited work space, welding work is facilitated and the inner tank can be assembled efficiently.
- the PC wall 3 is assembled at the outer peripheral edge portion of the base plate 2 in this way, and the outer tank roof 10 is assembled on the base plate 2 other than the outer peripheral portion in parallel therewith. And if the outer tank roof 10 is assembled to some extent, the jack tank 11 will raise the outer tank roof 10, and it will be hold
- a drain hole 19 for draining water from between the side liner 4 and the concrete 5 is provided in the base end portion that is the base portion of the PC wall 3. ing.
- the drain hole 19 is formed through the concrete 5 in the thickness direction. It is preferable that a plurality of the drain holes 19 are formed at predetermined intervals in the circumferential direction of the tank.
- the drain hole 19 is inclined so that the outside of the tank is low and the inside of the tank (side liner 4 side) is high.
- a minute gap reference symbol S in FIG. 10 cannot be prevented between the side liner 4 and the concrete 5 due to drying shrinkage of the concrete 5.
- the drain hole 19 at the base end portion of the PC wall 3, the flow of water can be appropriately managed, and the water accumulated in the gap S can be drained to the outside of the tank.
- the position where the drain hole 19 is formed is preferably closer to the foundation plate 2 from the viewpoint of suppressing water accumulation in the gap S.
- the foundation is formed by horizontally penetrating the PC wall 3 without tilting the drain hole 19. It may be formed close to the plate 2.
- leakage of tank contents is caused at the corners of the base plate 2 and the PC wall 3 using the space below the legged base 9.
- a thermal corner protection 40 is provided for prevention, but until the start of the installation of the cold insulation material inside the tank, a hole is provided on the side liner 4 side, and this is used as a drain hole, so that the clearance S The water accumulated in the tank can be drained inside the tank.
- the outer tank roof 10 is then raised by the jackup device 11 and installed on the top of the PC wall 3.
- the suspension-side jack mount 12 is fixed to the middle stage of the PC wall 3 and the suspension-side jack mount 12 is fixed to the top of the PC wall 3 via a temporary mount.
- Fixing to the inner tank side plate 20 is released, and the suspended side jack mount 16 is fixed to the outer peripheral edge of the outer tank roof 10.
- the jack-up device 11 is installed across the suspended-side jack mount 12 and the suspended-side jack mount 16.
- the holding stand 21 can be removed, and then the holding stand 21 is removed at an appropriate timing.
- a jack-up device 11 is provided in the middle stage of the PC wall 3 as shown in FIG. 12. And by this jackup apparatus 11, an inner tank is assembled to the last. That is, as described above, the raising of the inner tank side plate 20 by the jack-up device 11 and the attachment of the next inner tank side plate 20 to the lower side of the raised inner tank side plate 20 are alternately repeated, and the inner tank side plate 20 are sequentially assembled from the uppermost stage to the lowermost stage (8 stages in this embodiment).
- the inner tank when the inner tank is assembled to the end, the inner tank is lowered to a predetermined position on the base plate 2.
- the reason for this is to accurately lower the inner tank to a predetermined position on the base plate 2 in the subsequent process.
- the inner tank side plate 20 on the lower side is thickened corresponding to the relatively large liquid pressure of the content liquid after completion of the tank, but the inner tank side plate 20 on the upper side (especially the uppermost stage) is the inner solution. Since the plate thickness is reduced corresponding to the relatively small hydraulic pressure, it is advantageous in terms of strength to connect the suspended side jack mount 16 below the inner tank side plate 20.
- the legged base 9 is removed, and a cold insulation work for laying the cold insulation material 41 on the foundation plate 2 is performed.
- the cold insulation material 41 is provided with foam glass on the bottom thermal resistance reducing material laid on the base plate 2, and a hard lightweight cellular concrete, a pearlite concrete block, or a structural lightweight at the part where the inner tank is lowered. It is formed by providing concrete blocks and laying an inner tank bottom plate on them.
- ascending / descending steps 50 are provided along the PC wall 3, the roof frame 51, the barrel nozzle 52, and the like are provided on the outer tank roof 10, and concrete is placed on the outer tank roof 10. After the concrete is placed on the outer tub roof 10, the drainage holes 19 (see FIG. 10) that are no longer necessary are closed.
- the construction method of the cylindrical tank 100 having the metal inner tank and the concrete outer tank in the above-described embodiment is configured such that the side liner 4 is moved from the lowermost stage to the uppermost stage at the outer peripheral edge of the foundation plate 2.
- the PC wall 3 is assembled by placing concrete 5 using the side liner 4 as an inner mold following the assembly.
- the assembly of the side liner 4 and the placement of the concrete 5 are parallel work with a certain interval, and the protruding portion X of the side liner 4 on which the concrete 5 is not placed is suppressed to a certain range, so that the wind load The buckling of the side liner 4 due to can be prevented.
- the construction method of the cylindrical tank 100 which can suppress the amount of materials required for construction while preventing buckling of the side liner 4 can be obtained.
- the present embodiment by adopting a process of alternately performing butt welding of the next side liner 4 on the upper side of the side liner 4 and placing the concrete 5 up to a height including the butt welding portion.
- the protruding portion X of the side liner 4 on which the concrete 5 is not placed is suppressed to a certain range, and the weld line 4b which is the welded portion of the side liner 4 is sequentially covered with the concrete 5, so The buckling of the side liner 4 can be prevented more reliably.
- the side liner 4 and the concrete 5 are adopted by adopting a step of providing a drain hole 19 for draining water from between the side liner 4 and the concrete 5 at the base end portion of the PC wall 3.
- a gap that could not be prevented due to drying shrinkage of the concrete 5 is generated between the two and the moisture accumulated due to precipitation when the concrete 5 is placed or during rainy weather until the outer tank roof 10 is installed. Even if it manages, the flow of water can be managed appropriately and it can drain from the drain hole 19 of the base end part of PC wall 3.
- the inner tank is repeatedly repeated by alternately raising the inner tank side plate 20 by the jack-up device 11 and attaching the next inner tank side plate 20 to the lower side of the raised inner tank side plate 20.
- the addition of the inner tank side plate 20 is performed at a low position. Therefore, it is possible to assemble the inner tank safely in a low place while avoiding interference with the outer tank roof 10 held in the middle stage of the PC wall 3.
- the PC wall 3 is assembled by placing concrete with the side liner 4 as an inner mold, and is formed in the side liner 4 in advance with an opening 15 being embedded in the concrete.
- a stiffener 60 is preferably provided to withstand.
- the stiffener 60 is a temporary reinforcing material that can be removed after placing concrete.
- This stiffener 60 is provided with, for example, a reinforcing material having a thickness of 6 mm and a width of 300 mm that protrudes inward from the side liner 4 and corresponds to a preceding assembly portion (protruding portion X shown in FIG. 3) of the side liner 4.
- a reinforcing material having a thickness of 6 mm and a width of 300 mm that protrudes inward from the side liner 4 and corresponds to a preceding assembly portion (protruding portion X shown in FIG. 3) of the side liner 4.
- the side liner 4 is reinforced by the stiffener 60 separately from the limitation of the protruding portion X by placing the concrete 5 following the assembling of the side liner 4, so that buckling due to wind load is prevented. It can be prevented more reliably.
- the PC wall 3 is assembled, the outer tank roof 10 is assembled, and the inner tank is assembled at the same time. Since the space is secured, the cold insulation work on the bottom portion on the base plate 2 may be performed in parallel.
- the method of lifting the outer tank roof 10 with the jack-up device 11 has been described.
- the type of the jack-up device 11 is not limited to this form, and for example, the positions of the jack body 11a and the equalizer 17a It may be a form in which the relationship is upside down.
- the method of lifting the inner tank side plate 20 with the jack-up device 11 has been described.
- the type of the jack-up device 11 may be changed to push up the inner tank side plate 20.
- the jackup device 11 for lifting the outer tank roof 10 is prepared and used for one set, so that the necessary jackup device 11 is used. Can be reduced.
- the outer tank roof 10 being assembled is jacked up and held in the middle stage of the PC wall 3, but for example, the suspension deck 43 and the roof frame 51 on the foundation plate 2 It is also possible to assemble up to the barrel nozzle 52 and the like, jack up the almost completed outer tub roof 10 and hold it on the middle stage of the PC wall 3.
- the jackup device 11 is provided via the anchor plate 13 to support the outer tub roof 10 or the like.
- the opening 15 may be provided depending on the magnitude of the load to be supported. Ensuring a reaction force sufficient to support the outer tank roof 10 and the like by placing an additional concrete stud on the side liner 4 without depositing and depositing the load of the outer tank roof 10 or the like on a support having a stay or the like. Is also possible.
- the common jackup device 11 is used for jacking up the outer tub roof 10 and jacking up the inner tub side plate 20, but a dedicated jackup device may be used. If a dedicated jack-up device is used, it is almost unnecessary to change the installation position of the jack-up device as in the above embodiment, but the number of devices increases, so that it depends on the scale of the cylindrical tank 100 to be constructed. It is preferable to select any suitable one.
Abstract
Description
本願は、2012年11月12日に日本に出願された特願2012-248554号に基づき優先権を主張し、その内容をここに援用する。
本発明に係る第一の態様では、外槽側板が最下段から最上段へと順々に組み上げられ、その組み上げに追従して外槽側板を内側型枠としてコンクリートが打設されるため、外槽側板の組み上げとコンクリートの打設は一定の間隔をあけた並行作業となる。これにより、コンクリートが打設されていない外槽側板の高さがある一定範囲に抑えられるため、風荷重による外槽側板の座屈を防止できる。また、外槽側板の強度を維持するために板厚等を厚くする必要がないので、外槽側板の設計に際し板厚等を最適にして、建設に要する物量を必要最小限に抑えることが可能となる。
本発明に係る第二の態様では、外槽側板の突合せ溶接とコンクリートの打設とが交互に行われ、外槽側板の組み上げに追従してコンクリートが打設される。これにより、コンクリートが打設されていない外槽側板の高さがある一定範囲に抑えられると共に、外槽側板の溶接部分がコンクリートで順次カバーされていくため、風荷重による外槽側板の座屈をより確実に防止できる。
外槽側板を内側型枠としてコンクリートを打設すると、外槽側板とコンクリートとの間に、コンクリートの乾燥収縮上防ぎようがない隙間が生じ、この隙間に、外槽屋根を据え付けるまでの間に、コンクリート打設時や雨天時の降水によって水分が溜まってしまうことが懸念される。これに対し、本発明に係る第三の態様では、外槽の側壁の基端部に排水孔を設けることで、水の流れを適切に管理して排水することができる。
本発明に係る第四の態様では、内槽側板をジャッキアップ装置により上昇させつつ、順次その下に内槽側板を継ぎ足していくことで、内槽側板の継ぎ足しが低位置で行われる。そのため、外槽の側壁の中段に保持されている外槽の屋根部との干渉を避けつつ、低所での安全な内槽の組み立て作業が可能となる。
本発明に係る第五の態様では、ジャッキアップ装置にかかる荷重を外槽の側壁で受けさせるために、外槽側板に予め設けられた開口部にアンカー部を取り付けて、外槽側板と一体化させる。これにより、外槽側板の板厚を厚くする等してジャッキアップ装置を支える強度を確保する必要がなくなるため、外槽側板の板厚を必要最小限にしつつ、必要なアンカー点を確保することができる。
本発明に係る第六の態様によれば、外槽側板の組み上げに追従するコンクリートの打設とは別に、スティフナーを設けて外槽側板を補強することで、風荷重による外槽側板の座屈をより確実に防止できる。
図5に戻り、次に、外槽屋根10の外周縁部に、複数の吊側ジャッキ架台12に対応する複数の被吊側ジャッキ架台16が設置される。被吊側ジャッキ架台16は、外槽屋根10の外周縁部からタンク外方に向けて略水平に突出するよう設置される。この被吊側ジャッキ架台16は外槽屋根10の外周縁部に着脱可能に固定される。
なお、この被吊側ジャッキ架台16は、図5に示すような外槽屋根10の下方でなく、外槽屋根10の上方に設置されてもよい。
なお、複数の内槽側板20同士をタンク外で予め横方向に連結し、これをタンク内に搬入して環状に形成した後、上下に並ぶ内槽側板20同士を溶接してもよい。このように複数の内槽側板20同士の連結を作業空間の制限の少ないPC壁3の外側で行うことで、溶接作業が容易になり、効率よく内槽を組み立てることができる。
なお、被吊側ジャッキ架台16の内槽側板20に対する接続位置を下方に変更してもよい。その理由は、その後の工程で内槽を基礎版2上の所定の位置に精度よく下ろすためである。また、下段側の内槽側板20はタンク完成後における内容液の比較的大きな液圧に対応して板厚を厚くしているが、上段側(特に最上段)の内槽側板20は内溶液の比較的小さな液圧に対応して板厚を薄くしているため、被吊側ジャッキ架台16を内槽側板20の下方で接続した方が、強度的には有利となる。
最後に、図15に示すように、内外槽間18に保冷材42(例えばパーライト)が充填されて内外槽間保冷工事が行われ、また、外槽屋根10の屋根裏に設けたサスペンションデッキ43に保冷材44(例えばグラスウール)が敷設されて屋根裏保冷工事が行われる。
その後、塗装工事、配管保冷工事等を経て、LNG101を収容する円筒型タンク100の構築が完了する。
3 PC壁(外槽の側壁)、
4 側ライナー(外槽側板)、
5 コンクリート、
11 ジャッキアップ装置、
13 アンカープレート(アンカー部)、
14 アンカー、
15 開口部、
19 排水孔、
20 内槽側板、
60 スティフナー、
100 円筒型タンク、
S 隙間、
X 突出部分
Claims (6)
- 金属製の内槽とコンクリート製の外槽とを有する円筒型タンクの構築方法であって、
前記外槽の底部の外周縁部で外槽側板を最下段から最上段へと順々に組み上げつつ、前記組み上げに追従して前記外槽側板を内側型枠としてコンクリートを打設することにより、前記外槽の側壁を組み上げる工程を有する、円筒型タンクの構築方法。 - 前記外槽側板の上側への次の前記外槽側板の突合せ溶接と、前記突合せ溶接の部分を含む高さまでの前記コンクリートの打設と、を交互に行う工程を有する、請求項1に記載の円筒型タンクの構築方法。
- 前記外槽の側壁の基端部に、前記外槽側板と前記コンクリートとの間から水を排水するための排水孔を設ける工程を有する、請求項1または2に記載の円筒型タンクの構築方法。
- ジャッキアップ装置による内槽側板の上昇と、前記上昇した内槽側板の下側への次の内槽側板の取り付けと、を交互に繰り返すことで、前記内槽を組み立てる工程を有する、請求項1~3のいずれか一項に記載の円筒型タンクの構築方法。
- 前記外槽側板に予め開口部を形成する工程と、
前記コンクリートに埋め込まれるアンカーが接続されたアンカー部を前記開口部に取り付ける工程と、
前記開口部に取り付けられた前記アンカー部を介してジャッキアップ装置を支持させる工程と、を有する、請求項4に記載の円筒型タンクの構築方法。 - 前記外槽側板の内側に突出した環状のスティフナーが設けられている、請求項1~5のいずれか一項に記載の円筒型タンクの構築方法。
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AU2013342824A AU2013342824B2 (en) | 2012-11-12 | 2013-06-28 | Method for constructing cylindrical tank |
US14/435,827 US9441389B2 (en) | 2012-11-12 | 2013-06-28 | Method for constructing cylindrical tank |
CA2888882A CA2888882C (en) | 2012-11-12 | 2013-06-28 | Method for constructing cylindrical tank |
CN201380058584.1A CN104769196B (zh) | 2012-11-12 | 2013-06-28 | 圆筒型罐的构筑方法 |
PH12015500913A PH12015500913A1 (en) | 2012-11-12 | 2015-04-23 | Method for constructing cylindrical tank |
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JP (1) | JP6127459B2 (ja) |
CN (1) | CN104769196B (ja) |
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JP6398158B2 (ja) | 2013-09-10 | 2018-10-03 | 株式会社Ihi | 円筒型タンクのプレストレストコンクリート屋根 |
JP6663204B2 (ja) * | 2014-11-19 | 2020-03-11 | 株式会社Ihiプラント | 円筒型タンクの構築方法 |
EP3307963B1 (en) * | 2015-06-03 | 2020-10-07 | Onguard Group Limited | Securing assembly |
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