JPH07156860A - Self-sustaining square-shaped tank for liquid carrier ship and support device thereof - Google Patents

Abstract

PURPOSE:To simplify accuracy control of a tank support part, and enhance tank strength by omitting a movement restraining support device between the hull and a tank top part, and realizing improvement in tank constructability and structural simplification of the movement restraining support device in a self-sustaining square-shaped tank for a liquid carrier ship and a support device thereof. CONSTITUTION:Load support stands 7 and a lateral movement restraining support device 9 are arranged between an inner bottom part of the hull 1 and a tank bottom part, and movement restraining force in the lateral movement restraining support device 9 is set larger than a difference between a lateral directional sharing load and a value obtained by multiplying a vertical directional compressive load by a friction coefficient of a load support part, and the lateral directional movement of a tank 3 is restrained by combined use of support by sliding friction of the load support stands 7 or the like and support by the lateral movement restraining support device 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-supporting rectangular tank of a liquid carrier and its supporting device, and more particularly to a technique for preventing interference due to relative movement between a hull and a self-supporting rectangular tank.

[0002]

2. Description of the Related Art As a technique related to a liquid carrier, Japanese Patent Laid-Open Nos. 2-249796 (Liquid carrier) and 4-
No. 8999 (Liquid carrier gas tank support device), JP-A-4-92794 (Liquid carrier gas tank support device), JP-A-4-143187 (ship double shell structure and construction method thereof). Etc. have been proposed.

In a liquid carrier to which these techniques are applied,
As shown in FIGS. 9 to 11, the hull (hull) 1 has a double structure including an outer shell 1A and an inner shell 1B.
The tank 3 mounted in the hollow part 2 is a rectangular parallelepiped and has a self-supporting structure independent of the hull 1 (inner shell 1B) to flatten the deck and store a liquid such as liquefied gas. It is expected to be able to have excellent features such as expansion, ensuring safety in the event of an accident such as grounding, and improving reliability when transporting LNG (liquefied natural gas).

When the tank 3 has a rectangular shape,
As compared with a spherical tank, the tank partition wall 3a is more likely to be deformed due to internal pressure and the like. Therefore, as shown in FIG. 11, the inner wall of the tank partition wall 3a has an inwardly protruding large bone (reinforced internal structure). 1) is arranged to reinforce and FIG.
As shown in FIG. 2, the face plate 6 in an orthogonal state is arranged on the inner edge portion of the reinforcing plate 5 of the large bone 4 so as to improve the overall strength and reduce the weight.

Further, as shown in FIGS. 11 and 13, between the inner shell 1B and the tank 3, a load support base 7 for supporting the weights of the tank 3 and the mounted liquid at a plurality of points.
A front-rear movement suppressing support device 8 for suppressing the front-rear movement of the tank 3 and a left-right movement suppressing support device 9 for suppressing the left-right movement of the tank 3 are arranged. These front and rear movement restraining support devices 8 and left and right movement restraining support devices 9
Are arranged between the ceiling of the inner shell 1B and the top of the tank 3, and between the inner surface of the bottom of the inner shell 1B and the bottom of the tank 3. As shown in FIG. 13, the support device 8 for suppressing the front-rear movement is arranged in a horizontal row along the left-right direction and at the upper and lower positions of the tank 3 in the front-back direction between the inner shell 1B and the tank 3. It is set so as to restrain the relative movement in the directions and allow the relative movement in the left and right directions. In the lateral movement suppressing support device 9, as shown in FIGS. 11 and 13, at the vertical position of the tank 3, the lateral movement between the inner shell 1B and the tank 3 is restrained, and It is set to allow relative movement in the directions. In addition,
Since these supporting devices 8 and 9 are assembled in a normal temperature atmosphere, it is necessary to perform a highly accurate work in which the clearance for allowing movement in each horizontal direction is, for example, 1 mm or less.

In such a liquid carrier, it is necessary to study under a load condition in which it is predicted that an external force due to the influence of waves and the occurrence of pitching and rolling due to navigation, collision and the like will reach the tank 3. Among these, in the most severe load condition at the time of 30-degree heel (inclination in the left-right direction at 30 degrees), for example, 0.87 G in the vertical direction and 0.5 G in the horizontal direction are considered to be applied to the tank 3.

As shown in FIGS. 11 and 13, the tank 3
When the left and right movement restraint support devices 9 are arranged above and below, 30% of 0.5G is supported at the upper position and the remaining 70% is supported at the lower position. . In this case, at the lower position, the frictional force of each load support base 7 has a lateral movement suppressing effect. Therefore, the sliding friction coefficient (approximately 0.4 to 0.5
The lateral movement suppressing support device 9 at the lower position can be used because the lateral movement suppressing force of a value multiplied by
The movement restraint that should be shared by each is theoretically small.

On the other hand, a reinforced plywood for restraining heat transfer between the inner shell 1B and the tank 3 is used for the load support base 7 and each of the support devices 8 and 9. At that time, the stacking direction is the vertical direction. By setting to, only a compressive force is applied to the laminated portion at the time of supporting the weight so that sufficient strength is obtained.

[0009]

However, the tank 3 is
A structure capable of following the dimensional change of the support device 8 for suppressing forward and backward movement and the support device 9 for suppressing horizontal movement of the top of the tank 3 because of the contraction as shown by the chain line in FIG. 13 due to the cooling when the liquefied gas is mounted. At the same time, it becomes necessary to set high dimensional accuracy in consideration of the contracted state at room temperature. In addition, the inner shell 1 at room temperature
Since the space between the ceiling part of B and the top of the tank 3 is the narrowest part, the workability of dimensional adjustment at room temperature is likely to be impaired.

The present invention has been made in view of these circumstances. The support device for restraining the movement between the hull and the top of the tank is omitted to improve the tank buildability and the structure of the support device for restraining the movement. It is intended to simplify the above, simplify the accuracy control of the tank supporting portion, and improve the tank strength.

[0011]

The present invention proposes a plurality of means for achieving the above object. According to a first aspect of the present invention, an open space is formed between a hull and a tank top to allow relative movement between the hull and the tank, and a load of a tank and a mounted liquid is provided between an inner bottom of the hull and a tank bottom. A load support base that supports the plurality of points at a plurality of positions, and a lateral movement suppressing support device that suppresses lateral movement of the entire tank by supporting the tank bottom portion, and a lateral movement suppressing support device that suppresses movement. The self-supporting rectangular tank of the liquid carrier is configured so that it is set to be larger than the difference between the shared load in the horizontal direction and the value obtained by multiplying the vertical compressive load by the friction coefficient of the load supporting portion. A second aspect of the present invention is a reinforced internal structure including a reinforcing plate disposed on an inner surface of a tank partition wall so as to project inward, and a face plate integrally disposed on an inner edge portion of the reinforcing plate in a state orthogonal to the surface. And the cross-sectional modulus of the reinforced internal structure is set to be larger at the bottom of the tank and in the vicinity thereof than at other locations. A third aspect of the invention is a self-supporting rectangular tank of a liquid carrier, which is obtained by adding a configuration in which the cross-sectional coefficient is set to be large mainly by increasing the cross-sectional area of the face plate, to the second aspect of the invention. A fourth aspect of the present invention is a liquid carrier which is obtained by adding to the first, second or third aspect of the present invention a configuration in which a support device for suppressing forward and backward movement between the hull and the tank top is omitted. It is a freestanding square tank. According to a fifth aspect of the present invention, an allowable movement distance setting support device is disposed between the hull and the tank top, and the gap between the pair of stoppers and the chock in the allowable movement distance setting support device is the movement of the tank bottom position. A self-sustaining liquid carrier that is configured by adding a configuration in which it is set to be smaller than an allowable movement distance of a tank top by restraining movement of a restraining support device to the first invention, the second invention, the third invention, or the fourth invention. It is a square tank. A sixth invention comprises a pair of stoppers attached to the inner surface of the hull with a space therebetween, and a chock disposed integrally with the outer surface of the tank between the pair of stoppers, the chock comprising:
Formed by reinforced plywood bolted in the stacking direction,
A supporting device for a self-supporting rectangular tank of a liquid carrier having a structure in which a stacking direction of the reinforced plywood is set in a lateral direction orthogonal to a pair of stoppers facing each other.

[0012]

In the first aspect of the present invention, the support device for suppressing the lateral movement of the upper position of the tank is omitted, the top of the tank becomes relatively movable in the open space, and the load of the tank and the liquid mounted thereon is It is supported by a load support base at the bottom of the tank and each movement restraint support device. The movement of the tank in the left-right direction is restrained at the lower position of the tank by using both the support by the load support base and the like by the sliding friction and the support device for restraining the lateral movement. In the second aspect of the invention, when the tank is tilted in the left-right direction, the weight of the mounted liquid acts to deepen the tilt of the tank, exerts a deforming force on the tank partition wall, and the reinforcing internal structure is tilted. Stress is added. If the section modulus of the reinforced internal structure is set to a large value at the bottom of the place where stress concentration is likely to occur, the generated stress value can be kept low and even if the tank bulkheads are made almost uniform in thickness. This is advantageous in terms of ensuring safety and suppressing increase in tank weight.
In the third aspect of the invention, in addition to the effect of the second aspect of the invention, mainly by increasing the cross-sectional area of the face plate, the section modulus is increased, and the dimensional flexibility is provided at the position separated from the tank partition wall. Is secured. In the fourth invention, in addition to the operation according to the first invention, the second invention or the third invention, by omitting the support device for suppressing the forward / backward movement at the tank top, the hull and the tank top can be omitted. The installation of the structure in the narrow space between and is omitted, and the open space is secured. In the fifth invention, in addition to the operation according to the first invention, the second invention, the third invention, or the fourth invention, in the normal left-right movement range, the allowable movement distance setting support is provided. Although the device does not operate, the tank tilt is large and the tank tilt increases due to the operation of the permissible movement distance setting support device when it exceeds the movement restraint management range by the support base, the front and rear and left and right movement restraint support devices. Will be blocked. In the sixth invention, the strength of the chock in the movement restraining direction is increased, and at this time, the reinforcing plywood is bolted in the laminating direction, so that damage caused by peeling or the like in the laminating portion is prevented. It

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the self-supporting rectangular tank of a liquid carrier and its supporting device according to the present invention will be described below with reference to FIGS.

Between the hull 1 (inner shell 1B) and the top of the tank 3, as shown in FIGS. 1 and 2, the above-mentioned front-rear movement restraining support device 8 and left-right movement restraining support device 9 are provided. The installation is omitted, and an open space 1a that allows relative movement of the top of the tank 3 is formed. Therefore, as shown in FIGS. 1 and 3, the required number of the load support bases 7, the front-rear movement suppressing support devices 8 and the left-right movement suppressing support devices 9 are arranged only at the bottom position of the tank 3.

The lateral movement restraining support device 9 is arranged along the center line Y from a position directly below the restraint reference position S at the center of the dome 10 shown in FIG. 8 is arranged in the left-right direction from a position directly below the restraint reference position S along a line X orthogonal to the center line Y.

In the examples of FIGS. 1 to 3, the supporting device 8 for suppressing the forward and backward movement and the supporting device 9 for suppressing the lateral movement are installed only on the bottom of the tank 3, so that the load due to the external force applied to the tank 3 is applied. The load supporting base 7, the front-back movement suppressing support device 8, and the left-right movement suppressing support device 9 are set to be shared.

In the case of supporting the front-rear movement suppressing device 8, for example, when a collision load of 0.5 G is set, the load supporting base 7, the front-rear movement suppressing supporting device 8 and the left-right movement suppressing supporting device 9 are provided. If the load sharing based on the frictional force is 0.45 G when the total load is supported in the vertical direction, the load sharing of 0.05 G is performed by the direct movement suppressing force of the front-back movement suppressing support device 8. For this purpose, the number, size, sliding friction coefficient, longitudinal movement restraining ability, and the like of the front and rear movement restraining supporting devices 8 are set together with the load support base 7 and the lateral movement restraining supporting device 9.

In the lateral movement restraining support device 9, for example, under the most severe load condition of 30 degree heel (when tilting 30 degrees in the lateral direction), a compressive load of 0.
Assuming that 87 G and a lateral shift load of 0.5 G are applied to the tank 3 and the sliding friction coefficient is 0.45, the load support base 7, the forward-backward movement suppressing support device 8, and the left-right movement suppressing support device 9 will slide. Since the load sharing due to the frictional force in the direction is 0.87G × 0.45 = 0.3915G, the direct lateral movement restraining force in the lateral movement restraining support device 9 is 0.5G-0.3915G. = 0.1085G. Therefore, the movement restraining force required for the lateral movement restraining support device 9 may be a value larger than 0.1085 G and the safety factor may be taken into consideration.

Next, with reference to FIG. 4, a specific example of the supporting device for the self-supporting rectangular tank of the liquid carrier will be described by taking the lateral movement suppressing support device 9 that requires the most severe movement suppressing force as an example. In FIG. 4, reference numeral 11 is a stopper, 12 is a chock, 13 is a bolt, 14 is a fastening plate, 1
5 is a reinforced plywood, 16 is a support, 17 is a sliding surface (sliding plate), 18 and 19 are liners, and 20 is a heat insulating block.

The stopper 11 is a hull 1 (inner shell 1
It is attached to the inner surface of B) so as to form a pair with a space in the left-right direction which is the movement restraining direction. Between the pair of stoppers 11, a chock 12 is arranged integrally with the outer surface of the tank 3 (tank partition wall 3a). The chock 12 is
The reinforced plywood 15 is fastened in a compressed state in the stacking direction by the bolt 13 and the fastening plate 14, and
The stacking direction of the reinforcing plywood 15 is set not in the vertical weight supporting direction as in the prior art but in the lateral direction orthogonal to the movement restraining direction. As a result, the grain direction of the reinforced plywood 15 is set to face the pair of stoppers 11. Then, on the support stand 16 protruding from the inner surface of the inner shell 1B,
A sliding surface 17 for slidably supporting the reinforced plywood 15 of the chock 12 is arranged with the heat insulating block 20 interposed therebetween, and a liner 18 is arranged between the stopper 11 and the chock 12 in an interposed state. . The heat insulating block 20 is made of the same material as the reinforced plywood 15, but the stacking direction is set in the vertical direction.

With such a lateral movement restraining support device 9, since the reinforced plywood 15 is fastened by the bolts 13 at the portion of the chock 12, the bulge at the time of lateral compression is restrained. That, reinforced plywood 15
By preventing the peeling phenomenon of the laminated portion when compressed, the buckling strength is increased and the strength in the movement restraining direction is increased, and damage to the reinforced plywood 15 is prevented. Therefore, even if the size of the chock 12 is the same, the shear rigidity is increased to, for example, three times or more, and the applicability to the lateral movement restraining support device 9 is obtained.

The results of studying the effect on the tank 3 when the heel is 30 degrees will be described below.

[Pressure at Each Part at 30 ° Heel] When the tank 3 is tilted as shown in FIG. 5, the internal pressure due to the mounting liquid and the pressure due to the depth (head difference) from the water level WL are indicated by arrows. Is added as shown in. In FIG. 5, the length of the arrow represents the magnitude of the applied pressure in a simulated manner. In this case, since the strength of the hull 1 based on the water head difference (depth from the normal waterline) has been sufficiently examined, focusing on the relative movement of the tank 3, FIG.
As indicated by the chain line, the tank partition wall 3a is inclined to the right side with respect to the inner shell 1B, and the side interval H decreases.

[Stress Generated at the Time of Vertical Restraint] FIG. 6 shows that the support device 9 for restraining the horizontal movement is installed at the vertical position of the tank 3.
In addition, a load support base 7, a support device 8 for suppressing forward / backward movement, and a support device 9 for suppressing horizontal movement are installed below the tank 3, that is, the tank partition wall 3a in the structure of FIGS. 11 to 13 and The stress value applied to the reinforced internal structure 4 is modeled and shown. In the following stress model, it is shown that the inner side of the relevant surface is tensile stress and the outer side is compressive stress, and the numerical value is represented by the ratio with the maximum stress value of FIG. 7 being 1.00. 6 to 8 indicates the mesh at the time of FEM analysis.

[Stress Generated When Releasing Upward] FIG.
13 shows a stress model when the support device 9 for suppressing the lateral movement of the upper position in the structure of FIG. However, in this case, in the range of 70% from the top of the tank 3, there was no tendency for the stress value to significantly increase, so the description was omitted.

[Stress Generated at Improvement of Face Plate and Opening Up] As in FIG. 7, only the bottom portion of the tank 3 is restrained from moving, and the thickness and the thickness of the face plate 6 of the reinforcing internal structure 4 are changed. 1 illustrates a stress model of an embodiment of the present invention, in which at least one of the widths is increased (a sectional modulus is increased) (for example, 300 mm × 20 mm has a cross section of 450 mm × 40 mm).

[Comparison of Structure Examples] In the example of FIG. 6, the stress value of each part is smaller than that of the example of FIG. 7 on average, and if the comparison value 1.00 is the provisional maximum allowable value, It is clear that the strength of each part of the tank partition wall 3a and the reinforcing internal structure 4 can maintain safety even when the heel is 30 degrees. In the example of FIG. 7, the stress values tended to increase at the bottom of the tank 3 and the side portions in the vicinity thereof. Therefore, the tendency that the stress value becomes large cannot be avoided by simply removing the lateral movement suppressing support device 9 at the upper position shown in FIGS. 11 to 13 and diverting the other part as it is. . In the example of FIG. 8, since the technique of FIGS. 1 to 4 described above and the technique of increasing the section modulus of the face plate 6 in the reinforcing internal structure 4 are added, the technique for suppressing the lateral movement of the upper position is suppressed. Support device 9
Even when is omitted, the stress value is lower than that in the example of FIG. In other words, the stress value applied to the face plate 6 and the tank partition wall 3a can be reduced by a method of appropriately increasing the sectional modulus of the reinforcing internal structure 4 by increasing the sectional area of the face plate 6 or the like. In this case, the reinforcement internal structure 4 at the bottom of the tank 3 and the side portion in the vicinity thereof can be easily implemented by taking measures to increase the thickness or width of the face plate 6.

[Other Embodiments] In the present invention, the techniques described below can be adopted instead of the above-described embodiments. When omitting the support device 9 for suppressing the lateral movement of the upper position in the example of FIG. 11 and allowing the lateral movement of the top of the tank 3 or the like, the load support base 7 at the bottom of the tank 3 is provided.
In consideration of the allowable supporting load by the supporting devices 8 and 9, an allowable movement distance setting supporting device 21 that suppresses movement with an allowable gap G smaller than the allowable movement amount of the top of the tank 3 is provided as shown by a chain line in FIG. It is also effective to install it on top of 3. In this case, the allowable movement distance setting support device 21 is the same as that shown in FIG.
The chock 12 of the technique shown in is applied. When the height of the tank 3 is 20 m and the weight is supported by the load support base 7 and the supporting devices 8 and 9 at the bottom of the tank 3, the allowable amount of lateral movement of the top of the tank 3 is obtained. In the example, the allowable gap G is about 100 mm in the example of FIG. 8 and is smaller than this value, for example, about 50 mm. The side space H between the side surface of the inner shell 1B and the side surface of the tank 3 is, for example, about 1000 mm, and by operating the permissible movement distance setting support device 21 with a movement of about 50 mm, the tank partition wall 3a and the reinforced interior are reinforced. The generated stress value of the structure 4 can be set in a small range.

[0029]

The self-standing square tank of the liquid carrier according to the present invention has the following effects. (1) The weights of the tank and the mounted liquid are supported by a load support base at the bottom of the tank and each movement restraint support device to restrain the movement in the left and right directions by utilizing the frictional force of the frictional contact portion, and to limit the movement restraint range. The supporting device for suppressing the lateral movement of the tank bottom can be omitted by supporting the excess load by the supporting device for suppressing the lateral movement of the tank bottom. (2) With the above, an open space is formed between the hull and the tank top, and the structure of this part can be simplified and the constructability of neighboring structures can be improved. (3) By centrally installing the various supporting devices on the bottom of the tank, it is possible to improve the workability of adjusting the dimensional accuracy and simplify the accuracy management together with the omission of the supporting device on the top of the tank. (4) When reinforcing the tank bulkhead, increase the section modulus of the reinforcing internal structure at the tank bottom, etc., so that it can be reinforced to the desired strength without changing the specifications such as the thickness of the tank bulkhead. Can be carried out. (5) When the cross-section coefficient increases, the cross-sectional area of the face plate is mainly adjusted to improve the work at a position apart from the tank bulkhead without the interference of the tank bulkhead and to increase the size. There are few restrictions, etc., and it can be easily implemented even for existing tanks. (6) With respect to the tank top, by omitting the lateral movement restraint support device and the longitudinal movement restraint support device, it is easy to secure an open space between the inside of the hull and the tank top, and the tank structure Is simplified. (7) By installing an allowable movement distance setting supporting device instead of a normal supporting device on the top of the tank, the tank may be shaken more than the allowable range or the supporting device may malfunction. Can be reduced. The support device for a self-supporting rectangular tank of a liquid carrier according to the present invention has the following effects. By setting the stacking direction of the reinforced plywood used for the chock in the lateral direction orthogonal to the facing direction of the stopper, the shear strength of the stacking part does not affect the load supporting force, and the load supporting force is increased. In addition, it is possible to suppress the occurrence of a damage accident such as a tank.

[Brief description of drawings]

FIG. 1 is a cross-sectional view with a part omitted showing an embodiment of a self-supporting rectangular tank of a liquid carrier according to the present invention.

FIG. 2 is a plan view showing an embodiment of a self-supporting rectangular tank of a liquid carrier according to the present invention.

FIG. 3 is a plan view showing an installation situation of a load support base and respective movement restraining support devices in a bottom portion of a self-supporting rectangular tank of a liquid carrier according to the present invention.

FIG. 4 is a front view showing an embodiment of a supporting device for a self-supporting square tank of a liquid carrier according to the present invention.

5 is a model diagram of a pressure distribution state applied to a hull and a tank when the liquid carrier of FIG. 1 is heeled. FIG.

FIG. 6 is a model diagram of a stress generated when the tank is vertically restrained.

FIG. 7 is a model diagram in which a part of the stress generated when the upper restraint of the tank is released is omitted.

FIG. 8 is a model diagram in which a part of stress generated in the self-supporting rectangular tank and the supporting device thereof according to the present invention is omitted.

FIG. 9 is a front view showing an example of a liquid carrier.

FIG. 10 is a plan view showing an example of a liquid carrier.

FIG. 11 is a cross-sectional view showing an example of a liquid carrier.

12 is a cross-sectional view showing an example of a combined structure of a reinforcing plate and a face plate of the reinforcing internal structure of FIG.

13 is a plan view showing the arrangement of support devices on the top of the tank of FIG. 11. FIG.

[Explanation of symbols]

 1 Hull (Hull) 1A Outer Shell 1B Inner Shell 1a Open Space 2 Hollow Part 3 Tank 3a Tank Partition 4 Large Bone (Reinforcement Inner Structure) 5 Reinforcement Plate 6 Face Plate 7 Load Support 8 Support Device for Forward and Backward Movement Control 9 Support device for lateral movement control 10 Dome 11 Stopper 12 Chock 13 Bolt 14 Fastening plate 15 Reinforced plywood 16 Support stand 17 Sliding surface (sliding plate) 18 Liner 19 Liner 20 Insulating block 21 Allowable moving distance setting support device G Allowable gap H side spacing

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F17C 3/04 A

Claims (6)

[Claims] 1. An open space is formed between the hull and the top of the tank to allow relative movement between the two, and a load of the tank and the liquid to be loaded between the inner bottom of the hull and the bottom of the tank. A load support base that supports at a plurality of locations and a lateral movement restraining support device that restrains the lateral movement of the entire tank by supporting the tank bottom are arranged. A self-supporting rectangular tank for a liquid carrier, which is set to be larger than a difference between a directional shared load and a value obtained by multiplying a vertical compressive load by a friction coefficient of a load supporting portion. 2. A reinforcing internal structure comprising a reinforcing plate disposed in an inwardly projecting state and a face plate integrally disposed in an inner edge portion of the tank partitioning member in a state orthogonal to the surface on an inner surface of the tank partition wall. The self-supporting square tank of a liquid carrier according to claim 1, wherein the cross-sectional modulus of the reinforced internal structure is set to be larger than that of other portions at the bottom of the tank and in the vicinity thereof. 3. The self-supporting rectangular tank for a liquid carrier according to claim 2, wherein the section modulus is set to be large mainly by increasing the cross-sectional area of the face plate. 4. The support device for restraining the longitudinal movement between the hull and the tank top is omitted.
Or the self-supporting rectangular tank of the liquid carrier described in 3. 5. An allowable movement distance setting support device is disposed between the hull and the tank top, and a gap between a pair of stoppers and a chock in the allowable movement distance setting support device suppresses movement of the tank bottom position. The self-standing rectangular tank for a liquid carrier according to claim 1, 2, 3 or 4, wherein the distance is set to be smaller than an allowable movement distance of the tank top by restraining the movement of the supporting device. 6. A pair of stoppers mounted on the inner surface of the hull with a space therebetween, and a chock disposed integrally with the outer surface of the tank between the pair of stoppers, wherein the chock is in the stacking direction. A support device for a self-supporting rectangular tank of a liquid carrier, which is formed by a reinforced plywood bolted to a sheet, and a stacking direction of the reinforced plywood is set in a lateral direction orthogonal to a pair of stoppers facing each other.