JP2795102B2 - Cryogenic tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane tank for storing a low-temperature liquid, and more particularly to a structure for mounting an interior material thereof.

[0002]

2. Description of the Related Art The types of tanks for storing low-temperature liquids include:
Generally, there are two types: (1) A tank of a type that serves both as a pressure-resistant member and a liquid-tight member As typical examples thereof, there are a spherical tank, a metal double-shell tank, and the like. FIG. (2) A tank of a type in which a pressure-resistant member and a liquid-tight member are separated As a typical example, there is a membrane tank, and FIG.
FIG.

The former type is a type in which a pressure-resistant holding member 31 also serves as a liquid-tight member as shown in FIG. In FIG. 6, 32 is an outer tank, 33 is a cold insulator, and 34 is a support frame or a tank base. The latter type is shown in FIG.
As shown in the figure, both the bottom interior material 1 and the side interior material 2 are made of a thin plate (1.0 to 2.0 mm thick) membrane stainless steel plate or a thin plate (0.7 to 1.0 mm thick) 36% nickel steel. Are attached to the inner surfaces of the load-bearing bottom slab 3 and the load-bearing wall 4 made of concrete or the like via the bottom heat insulating material 5 and the side heat insulating material 6, respectively, and the side interior material is attached to the peripheral end of the bottom interior material 1. 2 is welded.

[0004] The liquid-tight member, that is, the tank interior material is cooled and contracted by the low-temperature liquid. Therefore, in order to prevent the thermal stress caused by this, the linear expansion is much more linear than that of stainless steel such as 36% nickel steel as described above. Either a special steel with a small coefficient is used, or a membrane stainless steel plate provided with a peak (corrugation) that absorbs thermal contraction.

[0005]

As described above, in the conventional low temperature tank, a thin interior material is used in order to suppress the generation of thermal stress. Careful management was required to prevent damage. Another problem is that 36% nickel steel is expensive and cannot be made into a thick plate, and the membrane stainless steel plate is expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a low-temperature tank which is safe against falling objects and has an inexpensive structure.

[0007]

According to the present invention, a thick plate is used for a bottom interior material or a roof interior material, and a heat shrinkage is provided at a tank corner portion to be joined to a side interior material made of a membrane steel plate. By providing a device that absorbs
This has solved the above-mentioned problem. That is, the feature of the present invention is that the bottom interior material or the roof interior material of the thick steel plate joined to the side interior material of the membrane steel plate,
Means for absorbing heat shrinkage of the bottom interior material or the roof interior material, which is arranged in the corner portion in the circumferential direction,
The means for absorbing the heat shrinkage includes a corner frame member hinged to a load-bearing wall, a support member for slidably supporting the tip of the corner frame member, the corner frame member and the bottom interior material or roof interior. And a connecting member for connecting to a peripheral end of the material.

[0008]

According to the present invention, the bottom interior material or the roof interior material of the thick steel plate facilitates welding with the side interior material of the membrane steel plate, and the bottom interior material is particularly safe against falling objects. It will be. In addition, since the heat shrinkage absorbing means is configured as described above, the corner frame rotates about the hinge and absorbs the radial displacement with respect to the radial displacement of the bottom interior material or the roof interior material. I do. For the displacement in the circumferential direction, no thermal stress is generated because the heat shrinkage absorbing means is arranged evenly separated.

[0009]

FIG. 1 is a cross-sectional view of a low-temperature tank according to a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a portion A (corner portion) in FIG. 1, and FIG. FIG. In the first embodiment, the present invention is applied to a tank bottom portion, and a SUS304 flat plate having a plate thickness of about 6 to 10 mm is used as the bottom interior material 1, for example. The side interior material 2 uses a 2 mm thick membrane stainless steel plate as before.

[0010] In order to equalize the heat shrinkage in the radial direction, the bottom interior material 1 of the thick plate is fixed to the center of the tank at a fixed point 1 by a known means.
1 is provided. A bottom insulating material 5 is mounted between the bottom interior material 1 and the load-bearing bottom slab 3. The bottom interior material 1
｛(Temperature difference between room temperature and liquid temperature) × linear expansion coefficient of bottom interior material ×
Since the tank is displaced toward the center of the tank by an amount equal to the tank radius｝, a heat shrinkage absorbing means 12 is provided in the tank corner to absorb the radial displacement.

The heat shrinkage absorbing means 12 are equally divided and arranged in the circumferential direction of the tank. Each heat shrinkage absorption means 12 is pivotally attached to the load-bearing wall 4 by a hinge pin 14 by an upper anchor 13. Corner frame member 15 and lower support member 16 slidably supporting the lower end of corner frame member 15.
, Projecting from the side surface of the corner frame 15,
And a connecting member 17 welded to the peripheral end of the connecting member. Since the corner frame members 15 are equally separated in the circumferential direction, no thermal stress is generated in the circumferential direction. The tip 15a of the corner frame member 15 that contacts the lower support member 16 is rounded, and the sliding surface 16a of the lower support member 16 is formed in an arc-shaped surface centered on the hinge pin.

The side interior member 2 of the membrane steel plate also extends to the corner frame member 15 side, the lower part of the frame interior member 2a is bent, and is joined to the bottom interior member 1 by lap welding 18 in a liquid-tight manner. . In the figure, 6 is a side heat insulating material, and 7 is a frame heat insulating material provided as needed. Reference numeral 8 denotes a roof, and reference numeral 9 denotes a roof insulation material.

Since the first embodiment is configured as described above, when the bottom interior material 1 of the thick steel plate is cooled by the stored low-temperature liquid, the heat shrinkage in the radial direction occurs as described above. Since the corner frame member 15 connected to the bottom interior member 1 by the connecting member 17 rotates around the hinge pin 14, the displacement in the radial direction can be absorbed. In addition, the load due to the internal pressure applied to the corner frame member 15 is borne by the bottom interior member 1 through the upper anchor 13 and the connecting member 17. Therefore, when the bottom interior material 1 is a flat thick steel plate, the construction with the side interior material 2 is facilitated, so that the cost can be reduced as a whole and the management can be easily performed without being damaged by falling objects. Becomes

Embodiment 2 FIG. 4 is a half sectional view showing an embodiment in which the present invention is applied to a tank roof, and FIG. 5 is an enlarged sectional view showing details of a portion B thereof. As shown in FIG. 4, when the roof of the tank is made of a material that can withstand pressure such as concrete, the roof interior material 10
Is made of a thick steel plate in the same manner as described above. And roof interior material 1
In order to support the weight of zero, the roof interior material 10 is held by the concrete roof 19 by the hanging material 20. Also,
The roof interior material 10 is fixed at the center of the tank in the same manner as described above.
In order to allow the roof interior material 10 to slide in the radial direction, the connection by the hanging material 20 is constituted by the elongated hole 22 and the pin 23. 25 is a roof heat insulating material.

The heat shrinkage absorbing means 24 for the thick steel plate roof interior material 10 is the heat shrinkage absorbing means 1 of the first embodiment.
2 can be installed upside down.
Can respond to heat shrinkage. That is, the heat shrinkage absorbing means 24 connects the lower part of the corner frame 15 with the anchor 13.
And the upper end thereof is brought into contact with the support member 16, and the roof interior member 10 and the corner frame member 15 are connected by the connecting member 17. The upper end of the frame interior material 2b is liquid-tightly joined to the roof interior material 10 by lap welding 26.

[0016]

As described above, according to the present invention, since the bottom interior material and / or the roof interior material are made of thick steel plates, a low-temperature tank can be manufactured at a low cost, and in particular, it can be used for falling objects. There is an effect that the safety of the bottom interior material is measured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a portion A in FIG.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a half sectional view of Embodiment 2 of the present invention.

FIG. 5 is an enlarged sectional view of a portion B in FIG. 4;

FIG. 6 is a sectional view of a conventional low-temperature tank.

FIG. 7 is a cross-sectional view of a conventional low-temperature tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom interior material 2 Side interior material 4 Bearing wall 10 Roof interior material 12 Heat shrink absorption means 13 Anchor 14 Hinge pin 15 Corner frame 16 Support material 17 Connecting material 24 Heat shrink absorption means

Claims (1)

(57) [Claims] 1. A bottom interior material or a roof interior material of a thick steel plate to be joined to a side interior material of a membrane steel plate, and the bottom interior material or a roof interior material which is circumferentially divided and arranged in a tank corner portion. A means for absorbing heat shrinkage of the material, the means for absorbing heat shrinkage is a corner frame member hinged to a load-bearing wall, and a support member for slidably supporting a tip of the corner frame material, A connecting member for connecting the corner frame material and a peripheral end of the bottom interior material or the roof interior material.