JPH048999A - Supporting device of gas tank for liquid transporting ship - Google Patents

Abstract

PURPOSE:To improve the shear strength of a heat insulating block and to prevent the loss of the supporting function for a horizontal load by constructing a supporting device with a structure provided with stoppers touching to the side walls of a heat insulating block and metallic rods embedded in the heat insulating block. CONSTITUTION:A supporting unit 6 is provided with heat insulating blocks 7, stoppers 8A, 8B suppressing the horizontal displacement of the heat insulating blocks 7 and metallic rods 9 embedded in each block 7. When a horizontal load is applied to the supporting unit, shearing force is applied to the upper and the lower portions of the heat insulating blocks 7 between both stoppers 8A, 8B, and the horizontal load can be supported by the blocks 7 and the metallic rods 9. Thereby a major portion of the shearing load can be supported by the metallic rods 9 to prevent the shear fracture of the heat insulating blocks 7.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a support device for a gas tank for a liquid carrier,
In particular, it improves the shear strength of the heat insulating block portion against horizontal loads.

"Prior Art" FIGS. 4 and 5 show conventional examples of liquid carriers for transporting low-temperature liquefied gases such as LPG and LNG. In this liquid carrier, an independent tank 2 for storing the above-mentioned low-temperature liquid is housed inside the ship's cargo 1, and the independent tank 2 is provided with a plywood heat insulating block between it and the inner bottom 1a of the ship's cargo 1. It has a structure that supports the weight by interposing a plurality of support stands (support devices) 3 consisting of the following. The surface of the independent tank 2 is covered with a cold insulation structure 4 such as a polyurethane foam material, and a void space (access space) 5 is defined between the cold insulation structure 4 and the ship's grain 1. The structure is such that the space 5 is filled with N, gas, or dry air.

In addition, the support stand (support device) 3 needs to support the horizontal load in addition to supporting the weight of the independent tank 2, and for this purpose, for example, a stopper is installed on the side of the insulating block. A method is being considered to suppress its horizontal movement.

``Problems to be Solved by the Invention'' However, the heat insulating block reduces heat transfer due to the thickness of the plywood stack, and supports the weight of the independent tank 2 in the stacking direction, so it is not parallel to the waste. The strength against horizontal displacement, that is, the shear strength, tends to decrease, and it is required to arrange support stands (support devices) 3 of sufficient size and number to correspond to the shear strength. In addition, if cracks occur along the tenth layer, the insulation block will separate into upper and lower parts, and the horizontal load supporting function of that part will be impaired.

The present invention aims to improve the shear strength of the heat insulating block portion. ■The purpose is to ensure that even if damage such as cracks occurs to the insulation block, its ability to support horizontal loads will not be impaired.

``Means for Solving the Problems'' As a means to solve these problems, conventional technology supports the weight of the independent tank with a plurality of insulating blocks interposed between the hull and the independent tank for liquid storage. However, in addition to these technologies, a stopper that is applied to the side of the heat insulating block to suppress its horizontal movement, and an overlying part for the vertically protruding part of the block are added.
This is a support device for a gas tank for a liquid carrier, which has a lateral load support part in the form of a knob and a metal rod embedded in a heat insulating block.

1 Function The weight support of the independent tank is primarily carried out by the insulating block section.

When a horizontal load is applied, the stopper intervenes to generate shear stress on the heat insulating block, but by supporting the shear load applied to the heat insulating block with the metal rod, This prevents the structural blocks from undergoing shear failure.

Additionally, if the insulation block loses its ability to support horizontal loads due to damage such as cracks, the metal rods will prevent the separated insulation blocks from shifting in the horizontal direction. Therefore, the function of supporting horizontal loads remains.

"Embodiment" Hereinafter, an embodiment of the support device for a gas tank for a liquid carrier according to the present invention will be described with reference to FIGS. 1 to 3.

A plurality of support devices 6 are arranged between the inner bottom 1a of the hull 1 and an independent liquid storage tank (independent tank) 2 to support the weight, and a void space is formed between the inner bottom 1a and the independent tank 2. (Access space) 5 is similar to the prior art example, but the support device 6 has a plurality of spaces interposed between the inner bottom fla of the hull 1 and the independent liquid storage tank 2. a heat insulating block 7, stoppers 8A and 8B for suppressing horizontal movement of the heat insulating block 7, a metal rod 9 buried in the heat insulating block 7, and a heat insulating block 7.
A support stand 10 is provided for supporting the inner bottom 1a of the hull I.

The heat insulating block 7 has metal rods 9 at multiple locations.
A vertical hole 7a for burying is made, and its upper and lower openings are closed with lids 7b made of the same material, resulting in an integrated structure as a whole.

The stoppers 8A and 8B are spaced apart from each other in the vertical direction, and the stopper 8A located at the upper position holds the insulating block 7 from both sides against the bottom of the independent liquid storage tank 2 to form a pair. The stopper 8B at the lower position is attached to the support base 10 so that the heat insulating block 7
are attached to form a pair by sandwiching them from both sides, and are arranged so as to suppress movement in the pair of horizontal directions and to allow movement in the orthogonal horizontal direction. Furthermore, the directions in which the stoppers 8A and 8B are allowed to move are set separately in the left-right direction and the front-back direction of the ship.

The metal rod 9 is made of a material having high mechanical strength, for example, 5US3.
A round bar or the like made of 04 material or the like is made to withstand the temperature of the liquid stored in the independent tank 2, and is inserted and buried in the vertical hole 7a of the heat insulating block 7, and the stoppers 8A and 8B are Lateral load support parts 9a and 9 overlap (become an overlapping state) with respect to the parts protruding in opposite directions from the bottom of the independent tank 2 and the support stand lO.
b, and the lid 7b is interposed above and below the lateral load supporting parts 9a and 9b.

Note that a sliding surface 10a for movably supporting the heat insulating block 7 is formed on the upper surface of the support stand 10 located between the stoppers 8B.

Therefore, the weight of the independent tank 2 is transmitted from the bottom of the independent tank 2 to the support stand 10 via the insulating block 7 and the metal rod 9, and this weight support is mainly carried out by the insulating block. 7 and a part is carried out by the metal rod 9.

On the other hand, when a horizontal load is applied to the support device, a shearing force that shifts in the horizontal direction acts on the upper and lower parts of the insulating block 7 between the stoppers 8A and 8B, and this horizontal load is transferred to the insulating block 7. 7 and a metal rod 9.

For example, when a horizontal load as shown by arrow (A) in Figure 1 is applied, part X and part 7 are pressed together, compressive stress is generated in the vicinity, and The laminated part of the heat insulating block 7 and the metal rod 9 located between the parts 7 and 7 support the shearing force and the like.

In this case, the metal rod 9 supports most of the shear load,
This will prevent the heat insulating block 7 from suffering shear failure.

If the heat insulating block 7 suffers shear failure, the horizontal load will be reduced because the lateral load support parts 9a and 9b of the metal rod 9 overlap with the stoppers 8A and 8B in the horizontal movement direction. The supporting function remains and acts as a support device 6.

Example of investigation> Figure 3 (A) and Figure 3 (B) are the arrows (A) in Figure 1.
This figure emphasizes the strain state and stress distribution of the heat insulating block 7 and metal rod 9 when a horizontal load (equally distributed load) in the direction is applied to the above-mentioned X portion and the 7 portions are supported by a rigid body. However, the width of the model shown in FIG. 2 was half that (three metal rods 9).

Moreover, each condition was set as follows.

[Insulating block] In Fig. 3 (A), as shown in Fig. 2 with the dimensions, width 4001 II 111 height 600 mm
, a reinforced plywood laminate in a healthy state with a length of 1500+ nm,
The inner diameter of the vertical hole 7a is 81φ. In FIG. 3(B), the layers are separated in 7 parts, and the other parts are as shown in FIG. 3(A) 1. Reinforced plywood laminate [metal rod] 5US304 round bar: 80φ x length 500mm.

3 pieces [Upper stopper 8A] Projection height 2150 m [Lower stopper 8B] Projection height 72001 m [Horizontal load 150 (look/am') was applied in the direction (A) in Figure 1 under these conditions. The strain state and stress distribution in this case are as shown in FIGS. 3(A) and 3(B). However, in the stress distribution in FIG. Rod 9 indicates a stress value in a healthy range that does not lead to destruction, and the range shown in black indicates a stress value in a healthy range that does not lead to destruction of the insulation block 7 and does not lead to destruction of the metal rod 9. ing.

To provide a supplementary explanation regarding FIG. 3(A), in the heat insulating block 7, stress concentration occurs in the
Stress concentration also occurs in the metal rod ζ9 near the parts 7 and 7, but these are within the range where their soundness is maintained.

In addition, to provide a supplementary explanation about FIG. 3(B), when the layers are separated at 7 parts, in addition to the X part and 7 part of the heat insulating block 7, a comparison is made with the vertical hole 7a on the right side which is farthest from the X part. As a result, reaction horns are concentrated in the vertical hole 7a near the X portion and the central vertical hole 7a, and furthermore, each metal rod 9
In this case, stress concentration occurs over a wider range than in the example shown in FIG. This is the range within which the soundness of the value is maintained. In other words, even if the insulation block 7 is separated into two parts due to cracks or other damage, each metal rod 9 functions to support the horizontal load, and the separated insulation block 7 in the horizontal direction.

"Effects of the Invention" As explained above, the support device for a gas tank for a liquid carrier according to the present invention provides the following excellent effects.

It is equipped with a stopper that is applied to the side of the insulating block to suppress horizontal movement, and a metal rod that overlaps the protruding part of the stopper, so that when a horizontal load is applied, the insulating block Both the steel rod and the metal rod can support horizontal loads, increasing the shear fracture strength of the insulation block.

Even if the insulation blocks undergo shear failure and separate between layers, the metal rods can support the horizontal load and maintain their function as a support device.

11! , Compared to the prior art example, it is possible to reduce the installation space of the support device, and the size of the ship can be reduced.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the supporting device for a gas tank for a liquid carrier according to the present invention. Figure 1 is a front view of the main parts, Figure 2 is a perspective view of the heat insulating block, Third
Figures (A) and 3 (I3) are stress distribution diagrams showing the strain state of the insulation block and metal rod when a horizontal load is applied to the insulation block, and Figure 4 shows a conventional example of a liquid carrier. The overall side view, FIG. 5, is a view taken along the line v--v in FIG. 4. 1... Ship grain, 1a... Inner bottom, 2... Independent tank for liquid storage (independent tank)
, 3... Support stand (support device), 4... Cold insulation structure, 5... Void space (access space), 6
...Support device, 7...Insulating block, 7a...Vertical hole, 7b...Lid, 8A/8B...Stopper, 9. ...metal rod, 9a, 9b...lateral load support section, lO...support stand, 10a...sliding surface, Fig. 1

Claims (1)

[Claims] A device that supports the weight of an independent tank by a plurality of insulating blocks interposed between a ship's grain and an independent tank for liquid storage, and a stopper that is applied to the side of the insulating block to suppress its horizontal movement. A support device for a gas tank for a liquid carrier, comprising: a lateral load support portion that overlaps the vertically projecting portion of the stopper; and a metal rod embedded in a heat insulating block.