JPH0932339A - Cooling block structure at the bottom ring of the low-temperature tank - Google Patents

Abstract

(57) [Abstract] [Problem] It is difficult to secure heat insulation performance, and various costs of manufacturing, handling, and local assembly are expensive. SOLUTION: A bottom ring portion cooling block 8 on the lower side of the inner tank side plate 3 of the LNG tank 1 is a lightweight aggregate that is integrally formed with a block lower half portion 8L made of pearlite concrete and a welding wire net 20 therebetween. A concrete block upper half 8U and a continuous cage-shaped welded wire mesh 2 located along the entire outer surface of the cold insulating block 8 and in the vicinity of the inner side of the outer surface
It is mainly composed of 0 and. Welded wire mesh without reinforcing bar 2
Since 0 is applied and the block lower half portion 8L and the block upper half portion 8U are integrally formed, various costs of manufacturing, handling, and on-site assembly can be significantly reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling block structure for a bottom ring portion of a low-temperature tank, and more particularly to a structure in which a lower half made of pearlite concrete and an upper half made of lightweight aggregate concrete are integrated and formed near an outer surface. The present invention relates to one in which a continuous basket-shaped welding wire net is buried.

[0002]

2. Description of the Related Art A low-temperature tank for storing LNG, LPG and the like has a heat insulating structure between an inner tank made of low-temperature steel and an outer tank to prevent evaporation of LNG and LPG. The inner tank side plate of the inner tank is formed in a cylindrical shape rising from an annular plate on the outer peripheral portion of the inner tank bottom plate. In the cold insulation structure that insulates the bottom side of the low-temperature tank, a ring cooling block located below the inner tank side plate is provided. In addition to the heat insulation function, this ring cooling block needs a load supporting function to support a load of 300 to 400 ton / m due to the seismic load during an earthquake.

Conventionally, as shown in FIG. 16, a lower ring block 100 made of perlite concrete is generally used as a bottom ring cooling block 100 in a low-temperature tank.
1. An upper half block 102 made of lightweight aggregate concrete is applied, and a plywood 10 is provided between the two blocks 101 and 102.
3 is pinched. And, in the lower half block 101,
A three-dimensional structural reinforcing bar 104 (with a diameter of about 13 to 22 mmφ) such as a jungle gym is embedded, and a similar three-dimensional structural reinforcing bar 105 (with a diameter of about 13 to 22 mm) is embedded in the upper half block 102.
2222 mmφ) is embedded. In addition, the annular plate 106, the plywood 107, and the inner tank side plate 108 of the inner tank bottom plate are also illustrated.

[0004] The strength of the conventional perlite concrete constituting the lower half block 101 is 50-60 kg / cm.
^2. The strength of the lightweight aggregate concrete forming the upper half block 102 is 300 to 350 kg / cm ² ,
The total weight of 1,102 reinforcing bars 104,105 is about 40-50
kg.

[0005] On the other hand, as shown in FIG. 17, a jungle gym cooling block is generally used as a bottom ring cooling block 110 in a low-temperature tank, as shown in FIG. Reinforcement 111 with a three-dimensional structure like this (strain diameter about 22m
mφ) is also known, and a SUS bearing plate 112 corresponding to the lower side of the inner tank side plate is provided.

[0006]

In the bottom ring cooling block 100 shown in FIG. 16, since the three-dimensional structural reinforcing bars 104 and 105 made of thick reinforcing bars are incorporated in both blocks 101 and 102, both blocks 101 and 102 are manufactured. There are problems that the cost is high, the costs of manufacturing, handling, and local assembly are high because the blocks 101 and 102 are separate bodies. In the bottom ring cooling block 110 of FIG. 17, since a three-dimensional reinforcing bar 111 made of a thick reinforcing material is incorporated, the manufacturing cost of the cooling block 110 is high, and the pearlite lightweight aggregate is inferior in heat insulation performance to pearlite concrete. Since the block is made of concrete, there is a problem that the heat insulation performance is reduced.

In general, reinforced concrete mainly shares tensile load with rebar and compressive load mainly with concrete. Considering that a large compressive load acts on a cooling block in the event of an earthquake, it is necessary to use a reinforced concrete. Incorporating sturdy rebar is almost pointless and should be reconsidered technically. An object of the present invention is to improve the load bearing capacity, prevent the heat insulation performance from lowering, reduce the manufacturing and assembly costs, and the like in the cold storage block at the bottom ring portion of the low-temperature tank.

[0008]

According to a first aspect of the present invention, there is provided a cold insulating block provided at a ring portion below a cylindrical side plate of a tank inner tank in a bottom portion of a low temperature tank. The cooling block is a continuous basket-shaped welding wire mesh located near the inside of the outer surface along almost the entire outer surface of the cooling block, and a perlite concrete embedded with the lower half of the welding wire mesh. The lower half of the block, the upper half of the block made of lightweight aggregate concrete embedded with the upper half of the welding wire mesh,
It comprises a lower half of the block and an upper half of the block formed integrally with each other via a welding wire mesh.

[0009] The welding wire mesh prevents cracks from being generated on the outer surface of the cooling block when the concrete in the lower half of the block and the upper half of the block dries. Since the lower half of the block is made of perlite concrete and the upper half of the block is made of lightweight aggregate concrete, the same heat insulation performance as that of the conventional one can be secured.

According to a second aspect of the present invention, the pearlite concrete constituting the lower half of the block has a strength by lowering a water cement ratio at the time of casting. 100 to 15
It is characterized by being a pearlite concrete increased to 0 kg / cm ² . Therefore, even if the reinforcing bars are omitted, the compressive strength can be sufficiently enhanced.

According to a third aspect of the present invention, there is provided a low-temperature tank bottom ring cooling block structure according to the second aspect, wherein the lower half of the block is buried in a position corresponding to a position below a cylindrical side plate of the tank inner tank. It has a reinforcing steel bar to increase the proof stress. The reinforcing bar can reinforce the lower half of the perlite concrete block corresponding to the portion below the cylindrical side plate of the tank in the tank, thereby preventing the lower half of the perlite concrete block from being compressed and broken.

According to a fourth aspect of the present invention, in the low-temperature tank bottom ring cooling block structure according to the first or second aspect, a portion of the lower half of the block corresponding to a portion below the cylindrical side plate of the tank inner tank is provided. It is made of lightweight aggregate concrete. Therefore, the strength of the portion of the tank inner tank corresponding to the lower side of the cylindrical side plate can be sufficiently increased.

According to a fifth aspect of the present invention, there is provided the low-temperature tank bottom ring cooling block structure according to the first or second aspect of the present invention, wherein a portion near the lower end of the upper half of the block is located below the cylindrical side plate of the tank inner tank. Corresponding parts are provided with reinforcing reinforcing bars for distributing the load to the lower half of the block. Therefore, the load can be distributed to the lower half of the block by the reinforcing bar.

According to a sixth aspect of the present invention, there is provided a low-temperature tank bottom ring cooling block structure according to the first or second aspect of the present invention, wherein the lower half of the upper part of the upper part of the lower part of the cylindrical inner side plate of the tank inner tank. A bearing plate having a predetermined width is provided in a portion in the tank radial direction. With this bearing plate, the load acting on the cylindrical side plate can be dispersed to enhance the compressive strength.

In a seventh aspect of the present invention, there is provided a low-temperature tank bottom ring cooling block structure according to the first or second aspect, wherein a portion of the lower half of the block corresponding to a portion below the cylindrical side plate of the tank inner tank. In addition, a plurality of reinforcing columns for improving the compressive strength are provided, and a supporting plate is provided at the upper end of each reinforcing column. Therefore, the compressive strength of the lower half of the block can be improved with the plurality of reinforcing columns and the support plate.

According to an eighth aspect of the present invention, there is provided a bottom ring portion cold insulating block structure for a low temperature tank according to the first or second aspect of the present invention, wherein a load acting from the cylindrical side plate of the tank inner tank is applied to the tank center side of the lower half portion of the block. In order to transfer to the part, the upper horizontal part located below the cylindrical side plate in the vicinity of the upper part of the upper half part of the block, and the block from the end of the upper horizontal part toward the center of the tank in the lower half part of the block. A plurality of downwardly inclined diagonal members that penetrate the upper half portion and the lower half portion of the block, and a lower end horizontal portion that is located in the vicinity of the lower end of the lower half portion of the block and that extends from the lower end portion of the diagonal member to the radial outside of the tank. The truss-shaped reinforcing member is provided. Therefore, the load acting from the cylindrical side plate of the tank inner tank is transmitted to the tank center side portion of the lower half of the block by the truss-shaped reinforcing member, and the effective pressure receiving area can be increased to enhance the compressive strength. .

[0017]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example of a case where the present invention is applied to a cold storage block structure of a bottom ring portion of an LNG tank. As shown in FIG. 1, an inner tank made of low-temperature steel (for example, 9% Ni steel) of the LNG tank 1 includes an inner tank bottom plate 2 including an outer peripheral plate 2 a and a portion near an outer peripheral edge of the annular plate 2 a. And a cylindrical inner tank side plate 3 that rises from the bottom. The ordinary steel outer tank of the LNG tank 1 has an outer tank bottom plate 4 and a cylindrical outer tank side plate 5 rising from a portion near the outer peripheral edge of the outer tank bottom plate 4.

The bottom heat insulating structure includes a circular thick plate-shaped leveling concrete 7 formed on the upper side of the slab concrete 6, a plurality of ring heat insulating blocks 8 extending all around the inner tank side plate 3, and this ring heat insulating block. A plurality of perlite concrete auxiliary blocks 9 extending over the entire circumference of the inner annular portion of 8, a bottom central heat-retaining structure 10 on the inner peripheral side with respect to the annular plate 2a, and a plurality of annular ring-shaped cold retaining blocks 8 are cast outside. It is composed of a pearlite cushion 11 having a continuous structure made of pearlite concrete, a number of plywoods 12 abutting on the lower surface of the inner tank bottom plate 2 and the like. The bottom center side cold insulation structure 10 is composed of a number of foamed glass blocks 12 stacked in five layers above the leveling concrete 7 and a number of foamed concrete blocks 13 arranged in one layer above the leveled concrete 7. I have.

The side cooling structure includes a glass wool layer 14 having a predetermined thickness formed on the outer surface of the inner tank side plate 3, a puff (PUF) layer 15 having a predetermined thickness formed on the inner surface of the outer tank side plate 5,
It is composed of a pearlite layer 16 made of granular pearlite filled between the glass wool layer 14 and the puff layer 15. Two anchor members 17 are provided for each of the ring cooling blocks 8 to connect the vicinity of the lower end of the inner tank side plate 3 and the flab concrete 6. The ordinary concrete barrier wall (not shown) made of concrete may be formed in close contact with the outer surface of the outer tub side plate 5 or formed at a predetermined distance from the outer surface of the outer tub side plate 5. May be.

Next, the structure of the ring cooling block 8 will be described. As shown in FIGS. 2 to 5, the cold insulation block 8 has a substantially convex shape in plan view, and both ends of the outer peripheral side portion are cut out to allow a pair of anchor members 17 to pass therethrough. The outer side of the tank is formed longer than the side of the center of the tank so that the cooling block 8 can be arranged in a ring shape. The cold insulation block 8 is formed of a continuous basket-like welding wire mesh 20 located near the inside of the outer surface along almost the entire outer surface of the cold insulation block, and a pearlite concrete in which the lower half of the welding wire mesh 20 is embedded. A block lower half 8L and a lightweight aggregate concrete block upper half 8U in which an upper half of the welding wire mesh 20 is embedded, wherein the block upper half 8U is formed integrally with the block lower half 8L.
And so on.

The welding wire mesh 20 is formed of a wire mesh (equivalent to JIS G3551) having a welding structure made of, for example, a 2.6 mmφ wire.
It is arranged at a position of 50 mm. In addition, as an alternative to the welding wire net 20, products equivalent to JIS G3552 to G3556 can be applied. The pearlite concrete constituting the lower half 8L of the block is excellent in heat insulation, and has a normal pearlite concrete strength (about 50 to 60 kg / cm ² ).
Although it has about twice the strength (about 100 to 150 Kg / cm ² ) of the above, the lower half 8L of the pearlite concrete block is made of a pearlite concrete material having a reduced water-cement ratio at the time of concrete casting. It can be manufactured by using. The lightweight aggregate concrete forming the upper half 8U of the block is ordinary lightweight aggregate concrete.

The required strength of the cooling block 8 is about 30 kg / c.
Since it is m ² , both the lower half 8L made of perlite concrete and the upper half 8U made of lightweight aggregate concrete have sufficient strength. The cooling block 8 has an I-bolt 21 for suspending the block.
In order to removably screw the anchors, three anchor hardwares 22 are provided in an embedded manner. Each anchor metal 22 is formed by joining an anchor body 23 and a nut member 24 located on the surface.

When the cooling block 8 is manufactured in an inverted shape, a mold, a welding mesh body (not shown) (not shown) is used.
, And the bottom of the welded wire mesh, the material for perlite concrete, the material for lightweight aggregate concrete, etc., then set the welded wire mesh body in the formwork and set the three anchor hardware 22. Next, a material for lightweight aggregate concrete is poured into the lower half of the formwork. Next, when the lightweight aggregate concrete is substantially solidified, the surface in contact with the pearlite concrete is roughened, and then the bottom of the welded wire mesh is tied to the upper end of the welded wire mesh body with a wire to form a weld wire mesh 20. A continuous welding wire net 20 is formed. Then, a material for perlite concrete is poured into the upper half of the formwork, the upper end surface is leveled with the upper end surface of the formwork, and the upper end surface is smoothed. After a predetermined curing period, the formwork is dismantled. Is completed.

The function and effect of the cooling block 8 will be described. In order to provide a continuous basket-like welding wire net 20 located near the inside of the outer surface along almost the entire outer surface of the cold insulation block 8, the lower half 8 of the block is provided.
When L and the concrete of the upper half portion 8U of the block are solidified, the occurrence of cracks on the outer surface can be reliably prevented. The lower half 8L of the cold insulation block 8 is made of pearlite concrete, and the upper half 8U of the block is made of lightweight aggregate concrete.
4) can be obtained. And
Since the strength of the pearlite concrete is increased so that the compressive strength does not decrease by the amount of the rebar, a sufficient compressive strength can be secured.

Since the welding wire mesh 20 which is lightweight and inexpensive and integrates the lower half and the upper half is applied by omitting the reinforcing bar, the manufacturing cost can be greatly reduced and the lower half of the block made of perlite concrete can be used. Since the portion 8L and the upper half portion 8U made of lightweight aggregate concrete are integrated via the welding wire mesh 20, the manufacturing cost, the handling cost, and the on-site assembly cost can be significantly reduced.

Next, various modified examples in which the cooling block 8 of the above embodiment is partially modified will be described. 1) Since ordinary pearlite concrete sufficiently satisfies the required strength of the cooling block, the lower half 8L of the block may be made of ordinary pearlite concrete. 2) The welded wire net 20 does not necessarily have to be made of a wire having a thickness of 2.6 mmφ, and may be made of a wire having a thickness of 2.6 to 5.0 mmφ.

3] As shown in FIG. 6 and FIG. 7, in this ring-shaped cold insulation block 8A, three reinforcing reinforcing bars 26, 27 located below the load action line FL on which the load from the inner tank side plate 3 is applied. (Commonly called spiral rebar)
It is buried in the lower half 8L made of perlite concrete. However, the reinforcing bars 26 and 27 are made of ordinary steel or low-temperature steel such as 9% Ni steel or SUS. The reinforcing reinforcing bar 26 is formed by connecting three loop-shaped reinforcing bars 26a vertically and at predetermined intervals with a plurality of vertical reinforcing bars (not shown), and the reinforcing reinforcing bar 27 connects the three loop-shaped reinforcing bars 27a vertically and at predetermined intervals. It is connected by a plurality of vertical rebars 27b.

By incorporating such reinforcing reinforcing bars 26 and 27, it is possible to effectively reinforce the required strength portion of the lower half 8L of the pearlite concrete block having low compressive strength. However, since the reinforcing reinforcing bars 26 and 27 are provided only locally, the manufacturing cost is only slightly increased. In the case of such reinforcement, the lower half 8L of the block may be made of ordinary pearlite concrete.

4] As shown in FIGS. 8 and 9, in the ring cooling block 8B, a predetermined width portion below the load action line FL and a portion outside the lower half portion 8L of the block lower half portion 8L. It is made of the same lightweight aggregate concrete as the upper half 8U of the block. Thereby, the compressive strength of the required strength portion of the lower half portion 8L of the block can be remarkably enhanced. However, when the lightweight aggregate concrete is cast, a temporary partition plate is set on the boundary surface 30 and the lightweight aggregate concrete is cast when the lightweight aggregate concrete is cast. What is necessary is just to remove the partition plate of the surface 30. When such a structure is employed, the lower half 8L of the block may be made of ordinary pearlite concrete.

Further, if necessary, a plurality of rod-like reinforcements extending in the tank radial direction may be provided in a predetermined area below the load action line FL in the vicinity of the lower end of the upper half portion 8U of the lightweight aggregate concrete block. Reinforcing bars 32 and 33 are embedded in a buried state. By the reinforcing steel bars 32 and 33, the lower half portion 8 of the block is provided.
Load distribution to L can be achieved. However, the reinforcing bars 32 and 33 are made of ordinary steel or low-temperature steel such as 9% Ni steel or SUS. As a result, the block upper half 8
By increasing the strength and rigidity in the vicinity of the lower end of U, the upper half 8U of the block can be effectively reinforced.

5] As shown in FIGS. 10 and 11, in this ring-shaped cold insulation block 8C, a predetermined portion below the load application line FL in the vicinity of the lower end of the upper half 8U of the block made of lightweight aggregate concrete. A plurality of bar-shaped reinforcing reinforcing bars 34 and 35 extending in the tank radial direction are embedded in the area portion. However, the reinforcing bars 34 and 35 are made of ordinary steel or low temperature steel. Thus, the strength and rigidity of the lower portion of the upper block half 8U in the vicinity of the lower end can be increased, the block upper half 8U can be effectively reinforced, and the load can be distributed to the block lower half 8L.

Further, in the lower half portion 8L of the block, reinforcing columns 36 made of a low-temperature steel mold or pipe are provided at three places below the load action line FL, and a supporting plate 37 is fixed at least at the upper end. 36 is incorporated. Thereby, the compressive strength of the required strength portion of the lower half portion 8L of the block made of perlite concrete and having a low compressive strength can be remarkably increased. Moreover, since the reinforcing column 36 has a relatively small cross-sectional area and is lightweight, the manufacturing cost is only slightly increased. When such a structure is adopted, the lower half 8L of the block may be made of ordinary pearlite concrete. If necessary, the lower half portion 8 of the block 8C may be located at two positions corresponding to the outer ends of the protruding portions 8b.
In L, a reinforcing column 38 made of low-temperature steel and having a supporting plate 39 fixed to at least an upper end thereof is incorporated.

6] As shown in FIG. 12 and FIG. 13, in the ring cooling block 8D, the block upper half 8
In the upper part of U, 9%
A bearing plate 40 made of Ni steel, SUS, or the like and having a predetermined width in the tank radial direction and made of low-temperature steel and having a thickness approximately equal to or greater than the thickness of the annular plate 2a is provided. Since the load acting on the load acting line FL can be dispersed by the bearing plate 40, it is advantageous in terms of the strength of the cold insulation block 8D. Also in this case, the lower half 8L of the block may be made of ordinary perlite concrete.

7] As shown in FIG. 14 and FIG. 15, in the ring cooling block 8E, the block upper half 8
Nine truss-like reinforcing members 41 are provided over the U and the lower half portion 8L of the block. Each of the truss-like reinforcing members 41 includes an upper horizontal portion 42 positioned below the load acting line FL corresponding to the cylindrical side plate 3 in the tank radial direction, and an upper horizontal portion 4.
2, a diagonal member 43 inclined downward from the end on the center side of the tank toward the center of the tank, and a lower horizontal part 44 extending radially outward from the lower end of the diagonal member 43 in the radial direction of the tank. These truss-like reinforcing members 41
Thereby, the load acting from the cylindrical side plate 3 can be transmitted to the tank center side portion of the lower half portion 8L of the block, the pressure receiving area can be increased, and the compressive strength can be enhanced. The truss-shaped reinforcing member 41 is made of low-temperature steel such as 9% Ni steel or SUS or ordinary steel.

[0035]

According to the first aspect of the present invention, a continuous basket-like welded wire mesh located near the inner side of the outer surface along substantially the entire outer surface of the cold insulation block and the lower half of the welded wire mesh are embedded. The lower half of the block made of perlite concrete and the upper half of the lightweight aggregate concrete block with the upper half of the welded wire mesh embedded, and formed integrally with the lower half of the block via the welded wire mesh Since the upper half portion of the block is provided, it is possible to prevent the occurrence of cracks on the outer surface of the cold insulation block when the concrete of the lower half portion of the block and the upper half portion of the block are dried by the welding wire mesh. Moreover, since the rebar having a three-dimensional structure is omitted and a remarkably lightweight welding wire mesh is applied, the manufacturing cost can be significantly reduced. With the lower half of the block made of perlite concrete and the upper half of the block made of lightweight aggregate concrete, the same heat insulation performance as that of the conventional one can be secured, and a welding wire mesh is connected between the lower half of the block and the upper half of the block. Since they are integrated through the intermediary, various costs for manufacturing, handling, and on-site assembly can be significantly reduced.

According to the second aspect of the present invention, the same effect as in the first aspect is achieved, but the pearlite concrete constituting the lower half of the block has a strength of 100 to 150 kg by lowering the water cement ratio at the time of casting. Since the perlite concrete is increased to / cm ² , the compressive strength can be sufficiently enhanced even if the reinforcing bars are omitted.

According to the third aspect of the present invention, the same effect as in the first or second aspect is obtained, but the lower half of the block is embedded at a position corresponding to a position below the cylindrical side plate of the tank in the tank. Because it has a reinforcing bar to increase the compressive strength,
With this reinforcing reinforcing bar, a portion of the lower half of the block made of perlite concrete, which corresponds to a portion below the cylindrical side plate of the tank in the tank, can be reinforced.

According to the fourth aspect of the present invention, the same effect as in the first or second aspect is obtained, but a portion of the lower half of the block corresponding to a portion below the cylindrical side plate of the tank inner tank is made of a lightweight bone. Since it is made of concrete, the strength of the portion corresponding to the lower side of the cylindrical side plate of the tank in the tank can be sufficiently increased.

According to the fifth aspect of the present invention, the same effect as in the first or second aspect is obtained, but a portion of the vicinity of the lower end of the upper half portion of the block corresponding to a portion below the cylindrical side plate of the tank inner tank. Is provided with a reinforcing bar for distributing the load to the lower half of the block. Therefore, a portion of the portion near the lower end of the upper half of the block below the cylindrical side plate of the tank inner tank is provided by the reinforcing bar. And the load can be distributed to the lower half of the block.

According to the sixth aspect of the present invention, the same effects as those of the first or second aspect are obtained, but the lower part of the cylindrical side plate of the tank inner tank in the upper end portion of the upper half portion is provided. Since the bearing plate having a predetermined width is provided in the tank radial direction, the load acting from the cylindrical side plate can be dispersed by the bearing plate to enhance the compressive strength.

According to the seventh aspect of the present invention, the same effect as that of the first or second aspect is obtained, but a portion of the lower half of the block corresponding to a portion below the cylindrical side plate of the tank in the tank is provided.
Since a plurality of reinforcing columns for improving the compressive strength are provided, and the supporting plate is provided at the upper end of each reinforcing column, the compressive strength of the lower half portion of the block can be improved with the plurality of reinforcing columns and the supporting plate.

According to the eighth aspect of the present invention, the same effect as in the first or second aspect is obtained, but the load acting from the cylindrical side plate of the tank inner tank is transmitted to the tank center portion of the lower half of the block. For this purpose, the upper horizontal portion located below the cylindrical side plate in the vicinity of the upper end of the upper half portion of the block, and the upper half portion of the block and the lower half portion of the block from the upper horizontal portion toward the tank center side of the lower half portion of the block. A plurality of truss-like reinforcing members are provided, each of which comprises a downwardly inclined diagonal material penetrating the lower part and a lower horizontal part located near the lower end of the lower half of the block and extending from the lower end of the diagonal material outward in the tank radial direction. Therefore, the truss-like reinforcing member allows the load acting from the cylindrical side plate of the tank inner tank to be transmitted to the center portion of the tank in the lower half of the block, thereby increasing the effective pressure receiving area and enhancing the compressive strength. .

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of an LNG tank according to an embodiment of the present invention.

FIG. 2 is a plan view of a ring cooling block.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a side view as viewed in the direction of the arrow IV in FIG. 2;

FIG. 5 is a front view as viewed in the direction of the arrow V in FIG. 2;

FIG. 6 is a plan view of a ring cooling block according to a modification.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a plan view of a ring cooling block according to a modification.

9 is a sectional view taken along line IX-IX of FIG.

FIG. 10 is a plan view of a ring cooling block according to a modification.

FIG. 11 is a sectional view taken along line XI-XI of FIG. 10;

FIG. 12 is a plan view of a ring cooling block according to a modification.

FIG. 13 is a sectional view taken along line XIII-XIII of FIG.

FIG. 14 is a plan view of a ring part cooling block according to a modification.

15 is a sectional view taken along line XV-XV in FIG.

FIG. 16 is a longitudinal sectional view of a ring cooling block according to the related art.

FIG. 17 is a longitudinal sectional view of a ring cooling block according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 LNG tank 2 Inner tank bottom plate 3 Inner tank side plate 8, 8A-8E Ring cooling block 8L Block lower half 8U Block upper half 20 Welded wire mesh 26,27 Reinforcing reinforcing bar 32,33 Reinforcing reinforcing bar 34,35 Reinforcing reinforcing bar 36 Reinforcing Pillar 40 Bearing plate 41 Truss-like reinforcing member 42 Upper horizontal part 43 Diagonal material 44 Lower horizontal part

Claims (8)

[Claims] 1. A cooling block provided on a lower ring portion of a cylindrical side plate of a tank inner tank in a bottom portion of a low-temperature tank, wherein the cooling block has an outer surface along substantially the entire outer surface of the cooling block. A continuous cage-shaped welded wire mesh located near the inner side of the inside; a lower half of a perlite concrete block in which the lower half of the welded wire mesh is embedded; and a light bone in which the upper half of the welded wire mesh is embedded. An upper half portion of a block made of material concrete, wherein the upper half portion of the block is formed integrally with a lower half portion of the block through a welded wire mesh. Construction. 2. The pearlite concrete constituting the lower half of the block is a pearlite concrete whose strength is increased to 100 to 150 kg / cm ² by lowering a water cement ratio at the time of casting. 2. The cold storage block structure of the bottom ring portion of the low temperature tank according to 1. 3. The lower half of the block has a reinforcing reinforcing bar buried at a position corresponding to a position below the cylindrical side plate of the tank inner tank to increase the compressive strength.
Or a block structure for cooling the bottom ring of the low-temperature tank according to claim 2. 4. The low temperature according to claim 1, wherein a portion of the lower half of the block corresponding to a portion below the cylindrical side plate of the tank inner tank is made of lightweight aggregate concrete. Cooling block structure at the bottom ring of the tank. 5. A reinforcing bar for distributing a load to a lower half of a block is provided in a portion corresponding to a portion below a cylindrical side plate of a tank inner tank in a portion near a lower end of an upper half of the block. 3. The cold storage block structure for a bottom ring portion of a low-temperature tank according to claim 1 or 2, wherein: 6. A bearing plate having a predetermined width in a tank radial direction is provided on a lower portion of a cylindrical side plate of a tank inner tank in an upper end portion of the upper half portion of the tank. Or a block structure for cooling the bottom ring of the low temperature tank according to claim 2. 7. A plurality of reinforcing columns for improving compressive strength are provided at a portion of the lower half of the block corresponding to a portion below the cylindrical side plate of the tank inner tank, and a supporting plate is provided at an upper end of each reinforcing column. 3. The block structure of the low-temperature tank at the bottom ring portion according to claim 1 or 2, further comprising: 8. In order to transmit the load acting from the cylindrical side plate of the tank inner tank to the tank center side portion of the lower half of the block, a lower portion of the upper half of the block near the upper end of the block below the cylindrical side plate. An upper horizontal part, a downwardly inclined diagonal member penetrating the upper half and lower half of the block from the end of the upper horizontal part toward the center of the tank in the lower half of the block, and a lower half of the block A plurality of truss-shaped reinforcing members are provided near a lower end of the stiffener, the plurality of truss-shaped reinforcing members comprising a lower end horizontal portion extending from the lower end of the diagonal material outward in the tank radial direction. Cooling block structure at the bottom ring of the tank.