JP3249283B2 - Low temperature tank membrane structure - 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 structure attached to an inner wall of a tank for storing a low-temperature liquid.

[0002]

2. Description of the Related Art FIG. 7 shows a cross section of a conventional cryogenic tank for storing a cryogenic liquid such as a liquefied gas. Numeral 12 is a concrete skeleton formed in a cylindrical shape, and a cold insulator 6 is adhered to an inner peripheral surface of the concrete skeleton 12, and a stainless steel membrane is fixed to a surface of the cold insulator 6 by an anchor 9. The membrane is constituted by the flat plate portion 8 and the fold portion 7 and directly contacts the low-temperature liquid 13.

FIG. 8 shows the above membrane structure, and FIG.
Indicates the structure of the above-mentioned folds of 7 parts. As shown in FIG. 9, the edge of the plate is bent to form two folded edges, and the folded portion is welded 14 to form a folded portion 7 having a palm-shaped cross section, in a direction perpendicular to the folded portion 7. The main branes are combined so that the folds 7 have a lattice shape as shown in FIG. 8, while having a function of absorbing contraction deformation at low temperatures.

[0004]

In the conventional main-brene structure of the low-temperature tank shown in FIGS. 7 to 9, the ends of the plate are bent to form two folded edges, and the welded portion is welded. Then, the folds 7 having a cross-shaped cross section are formed to have a function of absorbing shrinkage deformation at a low temperature in a direction perpendicular to the folds 7, while the folds 7 have a lattice shape as shown in FIG. Combining the main branes as described above, the fatigue damage of the helicopter joint is large, which is an obstacle to the enlargement of the low-temperature tank.

In addition, the length of the welding line of the end piece 15 (see FIG. 8) joined to the place where the helicopter joint and the fold 7 disappear, and the number of places to be inspected increases accordingly. Also, the end piece 15 must be used to make the fold 7 and the fold 7 continuous, and a weld line intersection occurs,
It is a weak point in strength. In addition, the ratio of on-site welding is large, the construction period required for installing the membrane block is long, and there is a problem that it is difficult to secure the installation accuracy because of the helicopter joint.

The present invention has been made in view of the above problems, and has as its object to achieve a significant reduction in the length of a welding line and a shortening of a construction period, and to realize a fatigue strength due to the use of bent folds and lap joints. It is an object of the present invention to provide a membrane structure for a low-temperature tank which can achieve both the improvement of the temperature and the reliability thereof.

[0007]

To achieve the above object, the present invention provides a cryogenic tank for storing a cryogenic liquid,
A multi-pleated sheet 1 in which a plurality of upper and lower horizontal folding pleats 16 are provided on one long plate by bending;
A bent fold 2 provided with a bent fold 16 bent at a predetermined angle at the center and provided with U-shaped notches 2a on both upper and lower sides;
A folded fold sheet 3 provided with folded folds 16 in the longitudinal direction and provided with triangular cutouts 3a on both left and right sides ;
3 corresponding to the triangular cutout 3a of the bent fold sheet 3.
A triangular connection piece 4 having an angular shape and provided with folded folds 16 in a lateral direction, and folds the multi-pleated sheet 1
And align the height positions of the bent folds 16 in the vertical direction and
Arrange at predetermined intervals between adjacent rows,
The folding between the multi-pleated sheets 1 arranged in rows
The pleated sheets 3 are provided side by side in the vertical direction.
The fold sheet 3 is formed by folding the multi-fold fold sheet 1 in a predetermined manner.
The folds 16 and the contacts arranged in the triangular cutouts 3a.
It is arranged at the position where the fold of the connection piece 4 is on the same straight line.
And the upper and lower ends have the predetermined folding folds 16.
The vertical direction inside the space between the other folding folds 16 above and below
And the bent folds 2 are arranged in a longitudinal direction.
Between the folded fold sheet 3 and the bent fold 2
Of the folded fold 16 of the multi-pleated sheet 1 adjacent to the
It is characterized by being arranged on a line .

[0008]

The membrane structure of the cryogenic tank according to the present invention is constructed as described above, and the multi-pleated sheets 1 are arranged in one row in the vertical direction and in multiple rows at intervals in the horizontal direction. Then, the folded pleated sheets 3 are arranged in upper and lower tiers with an interval between adjacent columns of each multi-pleated sheet 1, and each bent pleated sheet 2 is inserted between each folded pleated sheet 3 to form each bent pleated sheet 2. While the laterally folded folds 16 of each of the multi-pleated sheets 1 are made continuous.
The ends of the vertical folding folds 16 of the folding fold sheet 3 positioned above and below the bending folds 2 are inserted into U-shaped notches 2a provided at the center of both upper and lower sides of the bending folds 2, and the bent folds 2 are formed. The longitudinally folded folds 16 of each folded fold sheet 3 positioned above and below are made continuous, and the connection piece 4 is inserted into a triangular cutout 3a provided at the center of each of the folded fold sheets 3 at the left and right sides. 4 and the laterally folded folds 16 of each multi-pleated sheet 1 are made continuous.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the membrane structure of a low-temperature tank according to the present invention will be described with reference to one embodiment shown in FIGS. 1 to 6. FIG. 1, FIG. 2 and FIG. The pleated sheets 1 are arranged in one row in the vertical direction, and are arranged in multiple rows at intervals in the horizontal direction. In addition, each multi-section fold sheet 1
Are formed with a plurality of upper and lower folding folds 16 in the horizontal direction. That is, each of the multi-fold fold sheets 1 is provided with horizontal folds 16 in a plurality of upper and lower stages on one long plate by bending.

1 and 4 are folded fold sheets.
The folded pleated sheets 3 are arranged in multiple rows at intervals between adjacent columns of the multi-pleated sheets 1.
One longitudinal folding pleat 16 is formed at the center of each folding pleat sheet 3, and a triangular notch 3 a is provided symmetrically at the center of both left and right sides of each folding pleat sheet 3. ing.

FIGS. 1 and 3 show bent folds 2 arranged between the folded fold sheets 3 in the same row.
In the center of each of the bent folds 2, one bent fold 16 is formed, and in the center of both upper and lower sides of each bent fold 2, a U-shaped notch 2a is provided symmetrically. In FIG. 5, reference numeral 4 denotes a connecting piece. At the center of the connecting piece 4, a horizontal folding fold 16 is formed one by one.

Reference numeral 17 in FIG. 6 denotes a lap joint between the multi-pleated sheet 1 and the bent pleat 2. Next, the procedure for assembling the parts shown in FIGS. 1 to 6 to the inner peripheral surface of the cold insulator 6 attached to the inner peripheral surface of the cylindrical concrete skeleton 12 will be described. Each multi-pleated sheet 1 is arranged in one row in the vertical direction, and in multiple rows with an interval in the horizontal direction, and the folded pleat sheet 3 is spaced between adjacent columns of each multi-pleated sheet 1. Place and arrange in upper and lower tiers.

Further, each bent fold 2 is inserted between each folded fold sheet 3 so that the transverse fold 16 of each bent fold 2 and the transverse fold 1 of each multi-fold fold sheet 1 are formed.
6 and U-shaped cutouts 2a, 2a provided at the center of the upper and lower sides of the bent fold 2 at the ends of the vertical folds 16 of the folded fold sheet 3 located above and below the bent fold 2. And the longitudinal folding folds 16 of each folding fold sheet 3 located above and below the bending folds 2 are continued.

Triangular cutouts 3a, 3a provided at the center of both left and right sides of each folded fold sheet 3 with connecting piece 4
Into the connecting piece 4 in the lateral bending fold 1
6 and the folded folds 16 in the lateral direction of each multi-pleated sheet 1 are made continuous. The multi-pleated sheet 1 can be applied not only to the side membrane structure but also to the bottom membrane structure. In this case, the bent folds 2 become ordinary folds without bending.

[0015]

As described above, the membrane structure of the low-temperature tank according to the present invention is such that the multi-pleated sheets are arranged in one row in the vertical direction and in multiple rows at intervals in the horizontal direction, and are folded. The sheets are arranged in rows and columns with an interval between adjacent columns of each multiply fold sheet, each bent fold is inserted between each folded fold sheet, and each folded fold has a transverse fold and A U-shaped notch provided at the center of the upper and lower sides of the bent folds, with the ends of the vertical folds of the bent folds positioned above and below the bent folds being continuous with the horizontal folds of the fold fold sheet. Inserting the connecting piece into the triangular cutout provided in the center of the left and right sides of each folded fold sheet, inserting the connecting pieces in the vertical direction of each folded fold sheet located above and below the bent fold And the connection Since thereby continuously scan the lateral bending folds and each multi strip lateral bending folds of pleats sheet, significant reduction in the weld line length, the shortening of the construction period can be achieved,
The improvement of the fatigue strength and the improvement of the reliability due to the use of the bent folds and the lap joints can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a membrane structure of a low-temperature tank according to the present invention.

FIG. 2 is a perspective view showing a multi-pleated sheet having the same membrane structure.

FIG. 3 is a perspective view showing bent folds of the membrane structure.

FIG. 4 is a perspective view showing a folded fold sheet having the same membrane structure.

FIG. 5 is a perspective view showing a connection piece having the same membrane structure.

FIG. 6 is a perspective view showing a lap joint having the same membrane structure.

FIG. 7 is a perspective view showing a membrane structure of a conventional low-temperature tank.

FIG. 8 is a perspective view showing the membrane structure.

FIG. 9 is a perspective view showing a welded portion of the membrane structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-fold fold sheet 2 Bend fold 3 Fold fold sheet 4 Connection piece 6 Cold insulator 12 Cylindrical concrete frame 16 Fold fold

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-139598 (JP, A) JP-A-5-157195 (JP, A) JP-A-54-145013 (JP, A) JP-A 61-1986 55499 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F17C 1/00-13/12 B65D 88/00-90/66

Claims (1)

(57) [Claims] 1. A low-temperature tank for storing a low-temperature liquid,
A multi-pleated sheet 1 in which a plurality of upper and lower horizontal folding pleats 16 are provided on one long plate by bending;
A bent fold 2 provided with a bent fold 16 bent at a predetermined angle at the center and provided with U-shaped notches 2a on both upper and lower sides;
A folded fold sheet 3 provided with folded folds 16 in the longitudinal direction and provided with triangular cutouts 3a on both left and right sides ;
3 corresponding to the triangular cutout 3a of the bent fold sheet 3.
A triangular connection piece 4 having an angular shape and provided with folded folds 16 in a lateral direction, and folds the multi-pleated sheet 1
And align the height positions of the bent folds 16 in the vertical direction and
Arrange at predetermined intervals between adjacent rows,
The folding between the multi-pleated sheets 1 arranged in rows
The pleated sheets 3 are provided side by side in the vertical direction.
The fold sheet 3 is formed by folding the multi-fold fold sheet 1 in a predetermined manner.
The folds 16 and the contacts arranged in the triangular cutouts 3a.
It is arranged at the position where the fold of the connection piece 4 is on the same straight line.
And the upper and lower ends have the predetermined folding folds 16.
The vertical direction inside the space between the other folding folds 16 above and below
And the bent folds 2 are arranged in a longitudinal direction.
Between the folded fold sheet 3 and the bent fold 2
Of the folded fold 16 of the multi-pleated sheet 1 adjacent to the
A cryogenic tank membrane structure that is arranged on a line .