JP2002061795A - Storage tank and method for constructing storage tank - Google Patents

Storage tank and method for constructing storage tank

Info

Publication number
JP2002061795A
JP2002061795A JP2000251522A JP2000251522A JP2002061795A JP 2002061795 A JP2002061795 A JP 2002061795A JP 2000251522 A JP2000251522 A JP 2000251522A JP 2000251522 A JP2000251522 A JP 2000251522A JP 2002061795 A JP2002061795 A JP 2002061795A
Authority
JP
Japan
Prior art keywords
storage tank
tank
membrane
corner
portion
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.)
Pending
Application number
JP2000251522A
Other languages
Japanese (ja)
Inventor
Hideaki Nakamura
Yoshihiro Nose
英晃 中村
吉弘 能勢
Original Assignee
Ishikawajima Harima Heavy Ind Co Ltd
石川島播磨重工業株式会社
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 Ishikawajima Harima Heavy Ind Co Ltd, 石川島播磨重工業株式会社 filed Critical Ishikawajima Harima Heavy Ind Co Ltd
Priority to JP2000251522A priority Critical patent/JP2002061795A/en
Publication of JP2002061795A publication Critical patent/JP2002061795A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Problem] To provide a storage tank and a storage tank construction method capable of improving safety by maintaining a predetermined strength and having good workability during construction. A storage tank (1) includes an outer tank (6) and a membrane (5) provided inside the outer tank (6). Outer tub 6
And each of the membranes 5 has side walls 6a and 5a and roofs 6b and 5b, and the outer wall 6 and the membrane 5 at a corner C where the side walls and the roof are continuous. Is provided with a support portion 40 composed of a plurality of corner slants 4 arranged along the circumferential direction of the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage tank and a method of constructing a storage tank, and more particularly to a cylindrical flat bottom storage tank used for storing liquefied natural gas or liquefied petroleum gas, and a method of constructing the same. It is about.

[0002]

2. Description of the Related Art An underground cylindrical flat bottom storage tank is used as one of storage tanks for storing LNG (liquefied natural gas) and LPG (liquefied petroleum gas). This underground cylindrical flat bottom storage tank includes an outer tank 103 and a membrane 104 as shown in FIG. The outer tub 103 includes a cylindrical side wall 101 and a bottom 10.
6 is provided. The outer tub 103 is made of concrete or metal, and the membrane 104 is made of a thin metal plate such as stainless steel. Perlite or P
A cold insulator (heat insulating material) 105 made of UF or the like is provided between the outer tank 103 and the membrane 104. At the upper end of the side wall part 101, a dome-shaped roof part 102 is installed so as to be continuous with the side wall part 101,
The storage tank exposes the roof 102 to the surface,
1 and the bottom 106 are buried underground. Outer tub 103
Is to maintain the strength of the entire tank, and the membrane 104 made of a thin metal plate is to maintain the hermeticity of storage. The pressure inside the tank is
4 and to the outer tank 103 via the heat insulating material 105.

[0003]

By the way, when the sloshing phenomenon of the stored liquid occurs during an earthquake, the outer tank and the membrane are connected to the entire tank, that is, the side wall, so that the tank roof is not destroyed by the liquid pressure. It is preferable that it is formed continuously and integrally with the roof. In this case, it is necessary to bend the membrane at a corner portion C where the side wall portion and the roof portion are continuous. However, in order to maintain strength and reduce fatigue of the membrane, a predetermined angle (for example, 4 mm) is required.
It is not desirable to bend more than 5 degrees). However,
If the membrane is not bent to a desired angle, a space may be created between the membrane and the outer tub at the corner C. When this space is formed, the membrane is not supported by the outer tank, and the gas pressure due to the filling in the tank causes the membrane near the corner C to fatigue or buckle, thereby impairing the airtightness in the tank. Occurs. On the other hand, it is conceivable to provide a heat insulating material in the generated space, but it is not preferable in terms of strength, workability, and cost.

[0004] The present invention has been made in view of such circumstances, and it is possible to maintain the strength and improve safety, and at the same time, to provide a storage tank and a storage tank with good workability during construction. The aim is to provide a method.

[0005]

In order to solve the above-mentioned problems, a storage tank according to the present invention is a storage tank comprising an outer tank and a membrane provided inside the outer tank, wherein each of the outer tank and the membrane is provided. Has a side wall portion formed in a cylindrical shape, and a roof portion integrally provided so as to be continuous with an upper end of the side wall portion, and a corner portion where the side wall portion and the roof portion are continuous. Wherein a support portion is provided between the outer tank and the membrane in the circumferential direction of the tank.

According to the present invention, since each of the outer tank and the membrane has the side wall and the roof integrally provided on the side wall, the tank can obtain good strength and sealing performance. . Even if a space is formed when the corner of the membrane is bent by a predetermined angle, the deformation of the membrane can be prevented by the support provided between the outer tank and the membrane at the corner.

[0007] At this time, since the support portion has a plurality of members arranged along the circumferential direction of the tank, workability and safety during construction can be improved.

A heat insulating material is provided between the outer tub and the membrane, and the support portion is formed in a polygonal shape so as to conform to a shape of a space formed between the outer tub or the membrane and the heat insulating material. Therefore, the support portion is stably fixed to the corner portion. Therefore, safety can be improved.

In addition, since there is provided a filler filled in a gap formed between the outer tank or the membrane and the supporting portion,
The fixing of the support is more stable.

Further, since each of the plurality of members is fixed to the outer tank by one fixing member, workability is improved. In this case, since the supporting portion is composed of a plurality of members and the fixing members are provided for each of the members, the fixing of the members is stabilized, so that safety can be improved.

Further, by providing a supporting plate for supporting the fixing member between the outer tank and the supporting portion, the fixing of the supporting portion is further stabilized, so that safety and workability are improved. Can be.

Since this tank is buried in the ground, it has good storage properties, and the projecting portion on the ground surface is reduced, so that effective use of the ground surface can be realized. By providing the above-described configuration, it is possible to obtain good storage properties while maintaining stable strength even when buried underground.

[0013] A method for constructing a storage tank according to the present invention is a method for constructing a storage tank comprising an outer tub and a membrane provided inside the outer tub. A guide portion for movably supporting the carrier in the circumferential direction inside the outer tub at a corner portion where the roof portion is continuous with the side wall portion after the roof portion is formed so as to be continuous with the upper end of the portion. A support member to be installed in the corner portion is placed on the carrier, and the carrier on which the support member is placed is moved to a predetermined position along the guide portion. After installing the support member at the position, the membrane is provided.

According to the present invention, the guide member is provided in the vicinity of the corner portion, and the carrier on which the support member is mounted is moved along the guide portion, so that the support member is efficiently located at the predetermined position of the corner portion. To be transported. Therefore, workability and safety can be improved.

In addition, the support members are individually transported by the transport carriage, and the respective support members are fixed to the corners by one fixing member, so that the support members are efficiently installed at the corners. You.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a storage tank and a method for constructing a storage tank according to the present invention will be described below with reference to the drawings. 1 is an overall side sectional view of a storage tank of the present invention, FIG. 2 is an enlarged sectional view of a main part of the storage tank of the present invention, and FIG. 3 is a corner which is a continuous portion of a side wall and a roof. FIG. 5 is a top view of the vicinity of the portion viewed from the tank inner surface side. FIG. 4 is a side view for explaining a supporting portion (corner slant), and FIG. 5 is a diagram for explaining how the supporting portion is attached to a roof.

As shown in FIGS. 1 and 2, the storage tank 1
Includes an outer tank 6 and a membrane 5 provided inside the outer tank. The outer tub 6 includes a cylindrical side wall 6a, a dome-shaped roof 6b integrally provided so as to be continuous with an upper end of the side wall 6a, and a bottom 6c. Similarly, the membrane 5 has a side wall 5a formed in a cylindrical shape, a dome-shaped roof 5b integrally provided so as to be continuous with the upper end of the side wall 5a, and a bottom 5c. Further, a cold insulator (heat insulating material) 7 is provided between the outer tank 6 and the membrane 5. The side walls 6a, 5a and the roof 6b of the outer tub 6 and the membrane 5;
A support portion 40 is provided between the membrane 5 and the outer tub 6 at the corner portion C where the portion 5b is continuous. In addition, as shown in FIG. 1, the corner portion C indicates a portion where the side wall portions 5a, 6a and the roof portions 5b, 6b are continuous.

The membrane 5 is provided integrally with the side wall 5a, the roof 5b, and the bottom 5c by a thin metal plate such as stainless steel, for example, so as to maintain the hermeticity of the stored matter stored inside. And membrane 5
Is bent at a predetermined angle at the corner C.
The predetermined angle is obtained in advance based on the shape of the entire tank, the working efficiency, or the required strength, and is set to, for example, 45 degrees or less.

The outer tank 6 is made of, for example, a metal such as concrete or iron, and is used to maintain the strength of the entire tank. The heat insulating material 7 is made of, for example, perlite or PUF, and is provided between the membrane 5 and the outer tub 6.

The storage tank 1 provided with the heat insulating material 7 is provided with a liquefied natural gas (LNG) or a liquefied petroleum gas (LP).
G) and the like, and is a cylindrical flat bottom storage tank that can be stored, for example, entirely underground.

The support section 40 is composed of a plurality of members (corner slants) 4 made of, for example, lightweight concrete. The corner slant 4 is formed in a predetermined shape so as to follow the shape of the space H formed between the membrane 5 and the outer tub 6. In the case of the present embodiment, the side cross-sectional shape is formed to be substantially a pentagon.

As shown in FIG. 3, a plurality of corner slants 4 are arranged along the circumferential direction of the tank at the corner portion C.

As shown in FIG. 4, each corner slant 4 has one through hole 4a through which a fixing member (bolt) 10 can be inserted. As shown in FIGS. 2 and 5, a ring-shaped support plate 9 is installed outside the heat insulating material 7 (outside the corner slant 4) so as to conform to the shape of the roof. The support plate 9 has a plurality of holes 9 corresponding to the through holes 4 a formed in the corner slant 4.
The hole 9a allows the fixing member 10 inserted from the inside of the corner slant 4 to be inserted. Each corner slant 4 is supported at one point on the support plate 9 by the fixing member 10.

Further, each corner slant 4 is provided with two embedded bolts 11, and these two embedded bolts 11 connect the corner slant 4 and the heat insulating material 7.

A plurality of anchors 12 are provided at predetermined positions between the membrane 5 and the outer tub 6. In the present embodiment, the anchor 12 is arranged at a bent portion of the membrane 5.

A method of constructing the storage tank 1 having the above-described configuration will be described with reference to FIGS. Since the storage tank 1 in this embodiment is to be buried underground, first, a hole corresponding to the size of the storage tank 1 to be buried is formed. And the outer tank 6, the support plate 9
And an anchor 12, a side wall 5 a of the membrane 5 is provided, and a heat insulating material 7 is provided between the outer tub 6 and the membrane 5. Next, as shown in FIG. 6, a stage (scaffold) 20 for the worker M to perform the work is installed. The scaffold 20 is installed inside the tank in the vicinity of the corner C so as to be suspended from the roof 6b along the circumferential direction. The first scaffold 20a is connected to the first scaffold 20a via the pin 20b. A second scaffolding 20c rotatably connected and capable of projecting in the direction of the side wall 6a. Also,
In the present embodiment, the scaffolds 20 are installed in two stages in the vertical direction. Second scaffold 20c that can be extended to the side wall 6a side
Is provided, the worker M can approach and work on the side wall 6a side, so that the workability is improved.

Next, as shown in FIGS. 7 and 8, a frame 21 is installed along the inner circumferential direction of the side wall 6a. A rail (guide portion) 2 movably supporting the carrier 23 along the circumferential direction on the upper portion of the frame 21.
Lay 2

The transport vehicle 23 is provided so that the corner slant (support member) 4 can be placed thereon, and as shown in FIG. 8, is provided with a hydraulic jack 23a capable of moving up and down the placed corner slant 4. . In addition, the transport vehicle
3 is provided with a slide mechanism 23b capable of moving the placed corner slant 4 in the direction of contact and separation (radial direction of the tank) with respect to the side wall 6a, and the corner slant 4 is moved to a predetermined position by the transport cart 23. It is designed to be transported. Note that a plurality of (for example, two) transport vehicles 23 can be installed on the rail 22.

As shown in FIG. 7, the corner slant 4 to be installed is conveyed into the tank through an opening 24 formed in a part of the roof 6b, and is connected to the scaffold 20. The ink is supplied to the transport carriage 23 via the nozzle stage 25.

The transport trolley 23 to which the corner slant 4 has been supplied is transported to a predetermined position by the worker M, and is set at a predetermined position of the corner C by the hydraulic jack 23a and the slide mechanism 23b. Then, as shown in FIGS. 9 and 10, after one surface of the corner slant 4 is arranged so as to contact the side wall 6 a, the corner slant 4 is fixed to the roof 6 b provided with the support plate 9 by the fixing member 10. Fix for. One corner slant 4
It is connected to the support plate 9 by one fixing member 10.

In this case, the corner slant 4 and the support plate 9
If a gap 30 is formed between the outer tank 6 and the outer tank 6,
Filler 3 made of silicon resin or the like on the inner surface of support plate 9
After providing 1, the corner slant 4 can be installed. Further, after the corner slant 4 is installed, the gap 30 formed can be filled with the filler 31. By filling the filler 31, it is possible to prevent infiltration of rainwater or the like from the outside of the tank into the inside of the tank.

In order to prevent the filling material 31 filled in the gap 30 from flowing out, an uneven portion 32 made of rubber or the like is previously provided on the surface of the corner slant 4 as shown by a chain line in FIG. Is possible. Further, in the case where the filler 31 is filled after the corner slant 4 is installed, the workability is improved because the filler 31 can be injected into the groove formed by the uneven portion 32.

After the installation work of the corner slant 4 has been performed in all the circumferential directions inside the tank, the corner slant 4
The filler 8 is filled between each other. And frame 2
1 and the rail 22 are disassembled, the anchor 12 and the heat insulating material 7 on the roof 6b are provided, and the roof 5 of the membrane 5 is provided.
b from the inside of the tank, and the side wall 5b of the membrane 5
The arc welding process terminates a predetermined process in the construction process of the storage tank 1.

As described above, by providing the support portion 40 (corner slant 4) between the membrane 5 and the outer tub 6 at the corner portion C, the strength of the corner portion C can be improved. That is, when the entire storage tank 1 is buried underground, the side walls 5 of the membrane 5 and the outer tub 6 have a predetermined strength.
a, 6a and the roof portions 5b, 6b need to be integrally formed so as to be continuous.
It is not suitable from the viewpoint of strength and workability to bend at a predetermined angle or more at a plurality of points in the corner C. On the other hand, when the membrane 5 is not bent to a desired angle, the corner C
In some cases, a space may be created between the outer tank 6 and the membrane 5 or the heat insulating material 7. In this case, the membrane 5 made of a thin plate may be deformed or buckled by the pressure inside the tank. However, since the corner slant 4 is provided so as to fill this space, the membrane 5 is stably supported, so that the storage tank 1 having desired strength and sealing performance can be constructed.

The support section 40 includes a plurality of members,
That is, the corner slants 4 are arranged along the circumferential direction of the tank, and each of the corner slants 4 is fixed to the support plate 9 installed in the outer tank 6 at one place by the fixing member 10. Configuration,
Workability during construction is improved. Further, by forming the corner slant 4 from, for example, inexpensive lightweight concrete, the cost can be reduced.

Further, by providing the support plate 9 between the outer tank 6 made of concrete and the corner slant 4, the fixing of the corner slant 4 is further stabilized.

At this time, by forming the corner slant 4 into a polygonal shape so as to follow the shape of the corner portion C,
Since the movement of the corner slant 4 in the radial direction and the circumferential direction of the tank is restricted, the corner slant 4 has a corner C
Is installed stably.

By filling the gap 30 formed between the polygonal corner slant 4 and the outer tub 6 with the filler 31, the corner slant 4 is more stably installed, It is possible to prevent rainwater or the like from entering from outside the tank.

A rail 22 for movably supporting the carriage 23 is provided in the circumferential direction of the inside of the tank at the corner C, and a support member (corner slant) 4 to be installed at the corner C is mounted along the rail 22. The corner slant 4 is efficiently conveyed to a predetermined position by moving the conveyed carriage 23. Therefore, workability and safety during construction can be improved.

The corner slants 4 are individually conveyed by the carriages 23, and the corner slants 4 are supported at one point by the fixing members 10, so that the workability is greatly improved.

[0041]

The storage tank and the method for constructing the storage tank according to the present invention have the following effects. According to the storage tank of the present invention, each of the outer tank and the membrane is formed integrally with the side wall and the roof, so that good strength and sealing performance can be obtained. Even if a space is created when the membrane formed by integrally forming the side wall and the roof is bent at a corner at a predetermined angle, the support provided between the outer tank and the membrane at the corner is provided. (Corner slant) can prevent the membrane from being deformed and prevent the strength of the entire tank from decreasing. At this time, the workability and safety at the time of construction can be improved by constituting the support portion with a plurality of members arranged along the tank circumferential direction.

According to the storage tank construction method of the present invention,
A guide section is provided near the corner, and the carrier on which the support member is placed is moved along the guide section, so that the support member is efficiently transported to a predetermined position in the corner. Therefore, workability and safety can be improved. In addition, the support members are individually transported by the transport trolley, and each support member is fixed to the corner portion by one fixing member, so that the support member is efficiently installed at the corner portion.

[Brief description of the drawings]

FIG. 1 is an overall view showing one embodiment of a storage tank of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing one embodiment of a storage tank of the present invention.

FIG. 3 is a top view of the corner portion viewed from the inside of the tank.

FIG. 4 is a side view for explaining a support member.

FIG. 5 is a diagram for explaining a state in which a support portion is fixed to a support plate.

FIG. 6 is a view for explaining one embodiment of a method for constructing a storage tank according to the present invention.

FIG. 7 is a view for explaining one embodiment of a method for constructing a storage tank according to the present invention.

FIG. 8 is a view for explaining one embodiment of a method for constructing a storage tank according to the present invention.

FIG. 9 is a diagram for explaining how a support member is installed at a corner.

FIG. 10 is a diagram for explaining a manner in which a support member is installed at a corner.

FIG. 11 is a diagram for explaining the entire storage tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage tank 4 Corner slant (support member) 5 Membrane 5a (membrane) side wall part 5b (membrane) roof part 6 Outer tank 6a (outer tank) side wall part 6b (outer tank) roof part 7 Insulation material 9 Support plate 10 Fixing member Reference Signs List 20 scaffold (stage) 22 rail (guide part) 23 transport trolley 30 gap 31 filler C corner

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3E070 AA03 AA13 AB32 DA02 DA03 JB04 NA10 QA04 SA02 SA20 VA13 3E072 AA03 BA01 3E073 AA01 AB03 BA32

Claims (9)

[Claims]
1. A storage tank comprising an outer tub and a membrane provided inside the outer tub, wherein each of the outer tub and the membrane is continuous with a cylindrical side wall and an upper end of the side wall. And a roof portion provided integrally with the outer tank and the membrane at a corner portion where the side wall portion and the roof portion are continuous with each other, along the circumferential direction of the tank. A storage tank, comprising:
2. The storage tank according to claim 1, wherein the support portion includes a plurality of members arranged along a circumferential direction of the tank.
3. The storage tank according to claim 1, further comprising a heat insulating material between the outer tub and the membrane, wherein the support portion is formed between the outer tub or the membrane and the heat insulating material. The storage tank is formed in a polygonal shape so as to follow the shape of the space.
4. The storage tank according to claim 1, further comprising a filler that fills a gap generated between the outer tank or the membrane and a supporting portion. tank.
5. The storage tank according to claim 2, wherein each of the plurality of members is fixed to the outer tank by one fixing member. Storage tank.
6. The storage tank according to claim 5, wherein a support plate for supporting the fixing member is provided between the outer tank and the support.
7. The storage tank according to claim 1, wherein the tank is buried underground.
8. A method for constructing a storage tank comprising an outer tank and a membrane provided inside the outer tank, wherein the side wall of the outer tank is formed in a cylindrical shape and is connected to an upper end of the side wall. After forming the roof portion, a guide portion is provided to movably support the transport vehicle in the inner peripheral direction of the outer tub at a corner portion where the side wall portion and the roof portion are continuous, and the transport vehicle has the A support member to be installed at the corner is placed, and the carrier on which the support member is placed is moved to a predetermined position along the guide, and the support member is installed at a predetermined position in the corner. And then providing the membrane.
9. The storage tank construction method according to claim 8, wherein the support members are individually transported by the transport trolley, and the respective support members are fixed to the corners by a single fixing member. A method for constructing a storage tank, comprising:
JP2000251522A 2000-08-22 2000-08-22 Storage tank and method for constructing storage tank Pending JP2002061795A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000251522A JP2002061795A (en) 2000-08-22 2000-08-22 Storage tank and method for constructing storage tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000251522A JP2002061795A (en) 2000-08-22 2000-08-22 Storage tank and method for constructing storage tank

Publications (1)

Publication Number Publication Date
JP2002061795A true JP2002061795A (en) 2002-02-28

Family

ID=18740914

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000251522A Pending JP2002061795A (en) 2000-08-22 2000-08-22 Storage tank and method for constructing storage tank

Country Status (1)

Country Link
JP (1) JP2002061795A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017126380A1 (en) * 2016-01-19 2017-07-27 株式会社Ihi Construction method for double-hull tank

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017126380A1 (en) * 2016-01-19 2017-07-27 株式会社Ihi Construction method for double-hull tank
TWI628128B (en) * 2016-01-19 2018-07-01 Ihi股份有限公司 Method for constructing double shell tank

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