JP2004155439A - Manufacturing method for tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a tank, with which the tank can be efficiently manufactured, the surface is resistant to flaws, shaping accuracy can be improved, and up to large-sized tanks can be handled. <P>SOLUTION: The tank is formed of a polyhedron 10 by joining with one another a first circular plate material 11, a second circular plate material 19, a third annular body 16, a second annular body 17 and a first annular body 18 by welding or the like. The inside of the polyhedron 10 is filled with water. Thereafter, pressure is applied to the inside of the polyhedron 10 by using a compressor or the like from a pressurizing port 15a provided on the upper part of the polyhedron 10, thereby forming into a sphere by, so to speak, inflating a balloon. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a tank for storing a fluid, for example.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 10A and 10B, for example, when manufacturing a spherical tank 1, a plurality of flat plates cut into a predetermined shape are pressed into a predetermined curved surface shape, and then the entire shape is changed. The curved plate members 2, 3, 4, and 5 were welded to each other so as to form a sphere.
[0003]
[Problems to be solved by the invention]
However, in the manufacturing method of the tank 1, when the flat plate is formed into the curved plate material 2, 3, 4, 5 by press working, the press die and the plate material 2, 3, 4, 5 are rubbed. The plate members 2, 3, 4, and 5 were easily rubbed and scratched. In addition, since the spherical tank 1 is formed while the plate members 2, 3, 4, and 5 are welded to each other, workability is poor and it is difficult to form the tank 1 with a highly accurate spherical shape. Furthermore, the size of the press for pressing the flat plate is limited, so that it is difficult to manufacture a large tank 1.
[0004]
The present invention has been made by paying attention to the problems existing in such a conventional technique. An object of the present invention is to provide a method for manufacturing a tank which can be efficiently manufactured with OLE_LINK2, can be easily scratched on the surface of OLE_LINK2, can improve shape accuracy, and can handle a large-sized tank.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the invention of claim 1, a plurality of plate members are joined to each other to form a hollow polyhedron, and after filling the inside with water, pressure is applied to the inside of the polyhedron. The purpose is to make the required shape.
[0006]
Therefore, since the pressing of the plate material is not required, the surface of the tank is not easily scratched, and a large one can be handled. Further, since the shape is adjusted by pressurizing the inside of the tank after welding the plate material, the shape accuracy of the tank can be improved.
[0007]
In the invention described in claim 2, a plurality of strip-shaped rectangular plate members are joined to each other at their ends to form an annular body, and the annular bodies are joined to each other to form a hollow polyhedron. After filling the inside of the polyhedron, pressure is applied to the inside of the polyhedron to form a desired shape.
[0008]
Therefore, the same effect as the first aspect can be obtained.
According to a third aspect of the present invention, in the first or second aspect, the step of applying the pressure is characterized in that the step of applying the pressure and the step of releasing the pressure are repeatedly performed.
[0009]
Therefore, the same effect as the first aspect can be obtained.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
First, the polyhedron referred to here includes not only a plate-shaped plate material joined but also a ring-shaped plate material joined to each other.
[0011]
(1st Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
First, a plate material for forming the polyhedron 10 in the production of the spherical tank 30 will be described.
[0012]
As shown in FIGS. 1A and 1B, a plate material for forming the OLE_LINK1 polyhedron 10OLE_LINK1 includes a plurality of flat plates obtained by pressing or cutting a plate material made of, for example, stainless steel. Is used. And in this 1st Embodiment, the breakdown of the flat plate-shaped material is one first circular plate material 11, one second circular plate material 19, two first trapezoidal plate materials 12, and two second trapezoidal plate materials 13. And the first rectangular plate member 14 is one. The first trapezoidal plate 12, the second trapezoidal plate 13, and the first rectangular plate 14 are each formed in a strip shape and have a symmetrical shape.
[0013]
The first trapezoidal plate 12 and the second trapezoidal plate 13 have oblique sides 12c and 13c at both ends in the longitudinal direction, respectively. The first circular plate member 11 has a hole 11b at a substantially center thereof for mounting a valve unit 15 having a pressurizing port 15a and capable of opening and closing a check valve. The length of the circumference 11a of the first circular plate 11 and the length of the circumference 19a of the second circular plate 19 are formed to be substantially the same as the length of the short side 12a of the first trapezoidal plate 12, respectively. The length of the long side 12 b of the first trapezoidal plate 12 is formed to be substantially the same as the length of the short side 13 a of the second trapezoidal plate 13. Further, the length of the long side 13 b of the second trapezoidal plate 13 is formed to be substantially the same as the length of the long side 14 a of the first rectangular plate 14.
[0014]
When the polyhedron 10 is formed, as shown in FIG. 2, the first rectangular plate 14 is formed into a ring shape by molding, and the short sides 14b at both ends of the first rectangular plate 14 are joined by welding or the like. By doing so, the first annular body 18 is formed. In the same manner as described above, the oblique sides 13c at both ends of the second trapezoidal plate 13 and the oblique sides 12c at both ends of the first trapezoidal plate 12 are joined by welding or the like, so that the second annular body 17 and the third annular body 16 are respectively provided. Is formed. Thereafter, a pair of second annular bodies 17 is arranged so as to sandwich the first annular body 18 from above and below the first annular body 18, and the long side 14 a of the first annular body 18 and the long side 13 b of the second annular body 17 are arranged. Are joined by welding or the like. Further, a pair of third annular bodies 16 are arranged so as to sandwich them from above and below, and the short side 13a of the second annular body 17 and the long side 12b of the third annular body 16 are joined by welding or the like.
[0015]
After that, among the short sides 12a of the two third annular bodies 16 located on both the upper and lower sides, the first circular plate 11 is disposed on the upper side, and the second circular plate is disposed on the lower side. The polyhedron 10 is formed by joining the short side 12a of the third annular body 16 with the circumference 11a of the first circular plate 11 and the circumference 19a of the second circular plate 19 by welding or the like. At this time, as shown in FIG. 1, a valve unit 15 having a pressure port 15a is attached to the hole 11b of the first circular plate material 11 by welding or the like so that the polyhedron 10 can be pressed from the inside thereof.
[0016]
Then, as shown in FIG. 3, the polyhedron 10 is placed on oil-containing sand 31 (sand soaked with oil), and water is injected from the pressurizing port 15a to fill the inside of the polyhedron 10 with water. At this time, the oil plays a role of holding the sands together and plays a role of suppressing corrosion of the contact surface between the polyhedron 10 and the oil-containing sand 31. Thereafter, by gradually applying pressure to the inside of the polyhedron 10 from the pressurizing port 15a with a compressor or the like (not shown), a spherical tank 30 is formed from the polyhedron 10 so that a balloon is inflated.
[0017]
At this time, the polyhedron 10 is gradually finished into a spherical tank 30 by repeatedly applying pressure while gradually checking the overall shape thereof and opening the valve unit 15 to release the pressure. Further, at this time, since the inside of the spherical tank 30 is filled with water, a very large weight is applied to the bottom of the tank 30. However, the oil-containing sand 31 in which the sand is held by the oil may be broken. Therefore, the contact area between the tank 30 and the oil-containing sand 31 can be kept large. For this reason, since the tank 30 is stably held by the oil-containing sand 31, deformation of the bottom of the tank 30 due to its own weight can be suppressed.
[0018]
According to the first embodiment described in detail above, the following effects are exhibited.
The press work for forming the first circular plate material 11, the second circular plate material 19, the first trapezoidal plate material 12, the second trapezoidal plate material 13, and the first rectangular plate material 14 can be made unnecessary. The mold cost can be reduced, and the surface of the tank 30 can be prevented from being scratched by the press mold.
[0019]
・ Since press working is not required, large equipment such as a forming press is not required. For this reason, equipment costs can be reduced, and even a large tank 30 can be efficiently manufactured.
[0020]
After the polyhedron 10 is formed by joining the first circular plate 11, the second circular plate, the first trapezoidal plate 12, the second trapezoidal plate 13, and the first rectangular plate 14 to each other, pressure is applied to the polyhedron 10 from the inside. Thus, the tank 30 can be formed while checking the shape. Therefore, the shape accuracy of the tank 30 can be improved.
[0021]
Since the first trapezoidal plate 12, the second trapezoidal plate 13, and the first rectangular plate 14 have a length of substantially one circumference of the polyhedron 10, the third annular member 16, the second annular member 17, and the first annular member, respectively. When the body 18 is formed, the number of welding points is small.
[0022]
Since the tank 30 is stably held by the oil-impregnated sand 31, when the polyhedron 10 is pressurized from the inside to form the tank 30, it is possible to prevent the bottom of the tank 30 from being deformed by the weight of the tank 30. it can.
[0023]
(2nd Embodiment)
The second embodiment will be described with reference to FIG. 4, focusing on the differences from the first embodiment.
[0024]
As shown in FIG. 4, the polyhedron 10 formed by the method of the first embodiment is placed in water 32 so that almost the entire surface is in water. Thereafter, a spherical tank 30 is formed by gradually applying pressure to the inside of the polyhedron 10 so that the balloon is inflated from the polyhedron 10. At this time, since the buoyancy of the surrounding water 32 acts on the tank 30, the self-weight of the tank 30 applied to the bottom of the tank 30 can be reduced, so that the bottom of the tank 30 is deformed by the self-weight of the tank 30. Can be suppressed.
[0025]
According to the second embodiment described in detail above, the following effects are exhibited.
-Since the buoyancy from the surrounding water 32 can be applied to the tank 30, deformation of the bottom of the tank 30 due to its own weight can be suppressed.
[0026]
(Third embodiment)
The third embodiment will be described with reference to FIGS. 2 and 5, focusing on the differences from the first embodiment.
[0027]
As shown in FIGS. 5A and 5B, the plate material for forming the polyhedron 40 of the third embodiment is smaller than the first circular plate material 11, the second circular plate material 19, and the first trapezoidal plate material 12. A small third trapezoidal plate 42, a fourth trapezoidal plate 43 smaller than the second trapezoidal plate 13, and a second rectangular plate 44 smaller than the first rectangular plate 14 are used. Then, as shown in FIG. 2, the third annular body 16 is formed by rolling a plurality of third trapezoidal plate members 42 into a predetermined curved surface shape, and then joining the oblique sides 42 c to each other. Similarly, the second annular body 17 is formed by joining a plurality of fourth trapezoidal plate members 43 with their oblique sides 43c. Similarly, the first annular body 18 is formed by joining the short sides 44b of the plurality of second rectangular plate members 44, respectively. The polyhedron 40 is formed by joining the third annular body 16, the second annular body 17, and the first annular body 18 in the same manner as in the first embodiment.
[0028]
According to the third embodiment described in detail above, the following effects are exhibited.
-Since the polyhedron 40 can be formed using a relatively small plate material, large rolling equipment is not required.
[0029]
-Since the polyhedron 40 can be formed using a small plate material per sheet, the plate material can be easily rolled.
(Fourth embodiment)
The fourth embodiment will be described with reference to FIG. 6, focusing on differences from the first embodiment. In the fourth embodiment, the shape of the tank 30 is a rugby ball shape.
[0030]
As shown in FIG. 6, the rugby ball-shaped tank 50 of the fourth embodiment forms a polyhedron so as to form a substantially rugby ball shape by joining a plurality of plate members having a required shape. Fill the interior with water. Thereafter, a rugby ball-shaped tank 50 is formed from the polyhedron by gradually applying pressure to the inside of the polyhedron.
[0031]
Therefore, the same effects as in the first embodiment can be obtained.
(Fifth embodiment)
The fifth embodiment will be described with reference to FIG. 7, focusing on differences from the first embodiment. In the fifth embodiment, the shape of the tank 30 is an egg shape.
[0032]
As shown in FIG. 7, the egg-shaped tank 60 of the fifth embodiment forms a polyhedron so as to form a substantially egg-shaped body by joining a plurality of plate members having a required shape, and forms the inside thereof. Fill with water. Thereafter, by gradually applying pressure to the inside of the polyhedron, an egg-shaped tank 60 is formed from the polyhedron.
[0033]
Therefore, the same effects as in the first embodiment can be obtained.
(Sixth embodiment)
The sixth embodiment will be described with reference to FIG. 8, focusing on differences from the first embodiment.
[0034]
As shown in FIGS. 8A and 8B, a regular hexagonal plate 71 and a regular pentagonal plate 72 are used as the plate for forming the polyhedron 70 of the sixth embodiment. The length of the side 71a of the regular hexagonal plate 71 and the length of the side 72a of the regular pentagonal plate 72 are substantially the same. Then, by sequentially joining the sides 72a of the regular pentagonal plate 72 and the sides 71a of the regular hexagonal plate 71, five regular hexagonal plates 71 are formed around one regular pentagonal plate 72. It is joined and arranged. In this way, the regular pentagonal plate 72 and the regular hexagonal plate 71 are joined by welding or the like so that the five regular hexagonal plates 71 are positioned around the single regular pentagonal plate 72. Thus, the polyhedron 70 is formed.
[0035]
At this time, a hole is made in substantially the center of one regular pentagonal plate member 72 located above the polyhedron 70, and the valve unit 15 is attached to this hole. Then, after filling the inside of the polyhedron 70 with water, a pressure is gradually applied to the inside of the polyhedron 70 to form a spherical tank from the polyhedron 70.
[0036]
According to the sixth embodiment described in detail above, the following effects are exhibited.
The polyhedron 70 can be formed only by welding the plate 71 and the plate 72 to each other, so that the plate 71 and the plate 72 need not be formed. Therefore, equipment for forming the plate 71 and the plate 72 is not required.
[0037]
(Modification)
The present invention can be configured by modifying the above-described embodiment as follows.
[0038]
In the first to sixth embodiments, the step of applying pressure is performed on a pedestal having a spherical concave portion corresponding to the shape of the tank 30.
In the sixth embodiment, the polyhedron 70 is formed of only a triangular plate.
[0039]
As shown in FIG. 9, in the first to sixth embodiments, a part of the tank is made of a plate material having a different plate thickness from the others.
Therefore, for example, if the thickness of the plate material forming the lower hemisphere 91 of the tank 90 is made larger than the thickness of the plate material forming the upper hemisphere 92, the weight of the lower half of the tank 90 is increased. be able to. Therefore, the stability of the tank 90 can be improved.
[0040]
Next, technical ideas other than the claims that can be grasped from the embodiment will be additionally described below together with their effects.
(1) The method for producing a tank according to any one of claims 1 to 3, wherein the step of applying pressure is performed on oil-containing sand.
[0041]
Therefore, the load due to the weight of the tank can be prevented from being concentrated on the bottom of the tank, so that the bottom of the tank can be suppressed from being deformed by the load.
[0042]
(2) The method for manufacturing a tank according to any one of claims 1 to 3, wherein the step of applying the pressure is performed in water.
Therefore, the same effect as the above (1) can be obtained.
[0043]
(3) The method for manufacturing a tank according to any one of claims 1 to 3, wherein the shape of the plate member is a polygon.
Therefore, the same effect as the first aspect can be obtained.
[0044]
(4) A tank manufactured by the method for manufacturing a tank according to any one of claims 1 to 3.
Therefore, the same effect as the first aspect can be obtained.
[0045]
【The invention's effect】
As described in detail above, the present invention can provide a method of manufacturing a tank that can be efficiently manufactured, is hardly scratched on its surface, can improve shape accuracy, and can handle large-sized tanks. There is an effect that can be.
[Brief description of the drawings]
FIG. 1A is a front view of a polyhedron of a first embodiment, and FIG. 1B is a front view of a plate material. FIG. 2 is an explanatory view showing a process of forming the polyhedron of the first embodiment. FIG. FIG. 4 is an explanatory view showing a step of pressing the polyhedron in the second embodiment. FIG. 5 is an explanatory view showing a step of pressing the polyhedron in the second embodiment. FIG. 5 is a front view of the polyhedron in the third embodiment, and FIG. FIG. 6 is a front view of a tank according to a fourth embodiment. FIG. 7 is a front view of a tank according to a fifth embodiment. FIG. 8 is a front view of (a) a polyhedron of the sixth embodiment, and (b) a plate material. Front view [FIG. 9] Cross-sectional view of a tank of a modified example [FIG. 10] (a) Front view of a conventional tank, (b) Front view of plate material [Description of symbols]
10, 40, 70: polyhedron, 11: first circular plate as a plate, 19: second circular plate as a plate, 12: first trapezoidal plate as a plate, 13: second trapezoidal plate as a plate, 14 ... A first rectangular plate as a plate, 42 a third trapezoidal plate as a plate, 43 a fourth trapezoidal plate as a plate, 15a a pressurizing port, 16 a third annular body, 17 a second annular body, 18 ... First annular body, 30, 50, 60, 90 ... tank, 32 ... water, 71 ... regular hexagonal plate as a plate, 72 ... regular pentagonal plate as a plate

Claims (3)

A method for manufacturing a tank, comprising forming a hollow polyhedron by joining a plurality of plate members together, filling the inside with water, and then applying pressure to the inside of the polyhedron to obtain a required shape. A plurality of strip-shaped rectangular plate members are joined to each other to form an annular body by joining the ends thereof, and the annular bodies are joined to each other to form a hollow polyhedron, and after filling the inside with water, A method for manufacturing a tank, comprising applying pressure to the inside of the polyhedron to obtain a required shape. 3. The method for manufacturing a tank according to claim 1, wherein the step of applying pressure is performed by repeatedly applying and releasing pressure.

Images