JPH10305896A - Storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with any complicated frame bodies, to form the inside of simple flat surface, to simplify the structure, and to facilitate the execution by providing a side pressure brace member to hold an intersection part which is arranged outside a tank body and intersection with a side edge part of an adjacent side wall part, and preventing the deformation by the pressure of the stored liquid. SOLUTION: A tank body 1 is formed of a stainless steel plate, and is approximately rectangular in the plan view comprising four side walls 11. Side edge parts of adjacent side wall parts 11 are jointed to each other in a watertight condition in an intersected part of each side wall part 11 of the tank body 1, i.e., at a corner part of the rectangular tank body 1. A side pressure brace member 20 is provided on the intersected parts and joined parts. The side pressure brace members 20 are arranged outside the tank body 1, and connected to the joined part of the side wall part 11 so as to withstand the load to be applied in the horizontal direction. The joined part of the side wall part 11 is prevented from being deformed inward of the tank body 1 by the water pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank for storing a substantial fluid such as liquid, powder, granules, and slurry. More specifically, the present invention relates to a storage tank having a structure suitable for a large tank or the like composed of a thin metal plate or the like which is essentially a flexible member.

[0002]

2. Description of the Related Art Conventionally, a large storage tank, for example, a storage tank of a water supply reservoir of a water supply system is formed of an essentially rigid material such as concrete. The weight was large, and the ease of construction and earthquake resistance were not always satisfactory.

In order to solve such a problem, a storage tank made of, for example, a stainless steel plate has been developed. However, the storage tank of the distribution reservoir as described above is large, and when such a storage tank is formed of a stainless steel plate, the stainless steel plate is essentially a flexible member in design. .

Therefore, a conventional storage tank for a stainless steel plate has a structure in which a frame capable of supporting a predetermined water pressure and load is constructed, and a plurality of panels made of a stainless steel plate are attached to the frame. . However, as described above, the panel made of the stainless steel sheet material is essentially a flexible member, and when designed to have a predetermined rigidity, the size of one panel is about 1 m × 1 m. Becomes Therefore, in the case of a large tank, a complicated frame for attaching these panels must be formed, and the structure is complicated and the construction is troublesome. Especially in the storage tank of water supply equipment, it is necessary to clean the inside periodically.
If there is a complicated frame inside this tank as described above,
The cleaning work inside it becomes very troublesome.

In order to prevent such problems, it has been attempted to increase the dimensions of the single panels as much as possible and to make the structure of the frame holding these panels as simple as possible. However, considering cost and other factors,
In the case of a single panel, the dimension of the single panel is limited to about 1 m × 2 m even if a bead or other reinforcing portion is formed. Attempts have also been made to curve this panel outward or inward to increase the dimensions of a single panel,
Even in this case, the size of this single panel cannot be made too large, and if it is curved, its processing and the structure of the mounting portion between the panels or the frame are complicated, and the construction is not easy. Problems such as a decrease in workability occur.

In any case, in the conventional storage tank made of a thin plate, a complicated frame must be constructed inside the storage tank, and this frame becomes more complicated as the tank becomes larger. As a result, the construction becomes difficult, and maintenance work such as cleaning the inside becomes troublesome.

There is also a tank in which the shape of the entire tank is cylindrical and only the tension acts on the side wall. However, in such a tank, if the thickness of the side wall portion is reduced to be an essentially flexible member that can withstand only the tension, the tank has a flexible structure as a whole and cannot have earthquake resistance or the like. Therefore, in the case of large cylindrical tanks, the rigidity must be increased by increasing the thickness of the side walls, or a reinforcing frame must be constructed, and the construction of the thick plate material becomes troublesome. Or a complicated frame body is built inside, which causes the same problem as described above. In addition, when such a cylindrical tank is installed in the same installation area, there is also a problem that the capacity is smaller than that of a tank having a rectangular shape or a shape close thereto.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been developed in view of a storage tank made of a material which is essentially a flexible member in a large tank such as a stainless steel plate. Provide a storage tank that does not require a complicated frame body, has a simple smooth surface inside, has a simple structure, is easy to construct, uses less material, and can be constructed at low cost. Is what you do.

[0009]

According to a first aspect of the present invention, there is provided a tank body having a plurality of side walls and having a planar shape similar to a polygon, wherein the side walls have flexibility. A side pressure brace member having a cross-section where the plane shape is curved outward in an arc shape and which is disposed outside the tank body and holds an intersection where the side edges of the adjacent side walls intersect. At the intersections, the resultant of the horizontal tension generated on the side walls by the pressure of the stored material in the tank body is maintained to prevent these intersections from being deformed to the inside of the tank body. It is characterized by the following.

Therefore, when the pressure of water stored in the tank body, for example, water acts on the side wall, a substantially horizontal tension acts on the side wall and the tension opposes the water pressure. . This tension becomes a resultant force directed to the inside of the tank body at the intersection of the adjacent side walls, and becomes a load that deforms the intersection inward. Then, such resultant load is held by the lateral pressure brace member arranged on the outside to prevent the intersection from being deformed.

[0011] In such a tank, the side wall portion may be an essentially flexible member capable of withstanding the tension, and its thickness is reduced, and a large single member is used as long as it can withstand the tension. It is easy to construct and can be manufactured at low cost. Also, the intersection of these side walls is
Since it is held by the lateral pressure brace member having a rigid structure, the structure does not have a flexible structure as a whole, and sufficient earthquake resistance is obtained. Further, since the side pressure brace member is arranged outside the tank main body, there is no need to provide a frame member inside the tank main body, the inner surface thereof is simple and smooth, and cleaning and the like are easy. In addition, since this tank has a planar shape similar to a polygon, it is possible to increase the internal volume with respect to the installation area.

According to a second aspect of the present invention, each of the side walls is formed of a separate member, and is joined to each other at the intersection. Therefore, even in the case of a large tank, the dimensions of these side walls can be reduced, and transport and construction become easy.

According to a third aspect of the present invention, the side wall portion is formed by arranging a plurality of strips in parallel in a vertical direction, and each strip is disposed in the tank body. In accordance with the magnitude of the pressure acting on each of these strips by the stored material, the upper strip is formed to be thinner, and the lower strip is formed to be thicker.

Therefore, transport and construction are easy, and the thickness of the lower strip is increased in accordance with the pressure, so that the upper and lower strips have the same elongation, and the lower part of the side wall is formed. Only large bulges to the outside are prevented. Therefore, no unreasonable stress is generated at the joint portions of the respective strips, and the design is easy and the structure is strong.

According to a fourth aspect of the present invention, the lateral pressure brace member has a mounting flange portion arranged along a direction of a resultant force of the tension of the adjacent side wall portions, and The side edge portion of the portion is bent along the mounting flange portion and attached to the mounting flange portion. Therefore, the joining structure between the side wall portion and the side pressure brace member is simple, and the construction is easy.

According to a fifth aspect of the present invention, the side wall portion is curved outwardly by a catenary curve or a curve similar to the catenary curve. Therefore, since these side walls are formed from the beginning into a shape that is finally deformed when pressure from the inside acts, deformation of the side walls when stored matter is stored inside is small,
Unreasonable load does not act on each part.

The present invention according to claim 6 is provided with a cover surrounding the outside of the tank main body. Therefore, the side pressure brace member and the curved side wall portion arranged outside are surrounded, and the appearance is improved,
This tank main body is shielded from wind and rain, direct sunlight, and the like, so that, for example, in the case of a storage tank or the like of a water supply facility, it is possible to prevent rainwater from entering the tank main body or increasing the water temperature.

According to a seventh aspect of the present invention, the cover has a plurality of planar side panels, and the planar shape is a polygon corresponding to the planar shape of the tank body. The central portion of the panel portion is located near the maximum bulging portion at the central portion of each side wall portion of the tank body and is arranged along the tangential direction of the maximum bulging portion, and the intersection of the adjacent side panel portions is provided. Are arranged at the positions of the side pressure brace members, and these side pressure brace members are accommodated in the corners of the intersections of these side panel portions. Therefore, this cover is the smallest dimension surrounding the tank body,
The material of the cover can be reduced, and the installation area can be reduced.

According to a further aspect of the present invention, the tank body has four side walls and has a square planar shape, and the cover also has four side panel portions. The shape is a square. Therefore, the plane shape is a quadrangle, and a tank with the maximum capacity can be installed in a predetermined site.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 8 show a first embodiment, which is a storage tank made of stainless steel plate of a distribution reservoir of a water supply system, which is a large tank having a size of 16 m × 18 m and a height of about 4 m. is there.

In the drawing, reference numeral 1 denotes a tank main body of the storage tank. The tank main body 1 is formed of a stainless steel plate as will be described later, and has a substantially rectangular planar shape composed of four side walls. is there.

A cover 2 is provided around the tank body 1. The cover 2 is made of, for example, an aluminum panel, has a rectangular planar shape substantially corresponding to the shape of the tank main body 1 and includes a side panel portion 4 and a roof portion 4. Protects against direct sunlight and mechanical damage such as collisions with vehicles and construction equipment. In addition, 5 is a staircase and 6 is a handrail.

The tank main body 1 is configured as shown in FIGS. That is, the tank body 1 has four side walls 1 which are substantially single members.
1, a lid member 12 and a bottom wall 13, and have a substantially rectangular planar shape. A rain gutter is provided on the outer periphery of the side wall portion 11 to drain rain water from the lid member 12. Further, the bottom wall portion 13 is provided on an appropriate base member 14 and is configured to withstand the pressure of tap water stored therein. The configurations of the lid member 12 and the bottom wall portion 13 are the same as those in the related art.

The tank body 1 is of a two-tank type with the interior divided into two parts by a partition wall 15 for the convenience of cleaning and the like, and the sections partitioned by the partition wall are drained and drained one by one. It is configured so that the cleaning does not cause water interruption. As shown in FIG. 1, an inflow pipe 7, an outflow pipe 8 and a drain pipe 9 communicate with each of the two divided sections.

Each of the above-mentioned members is made of a stainless steel plate or a stainless steel material so as to prevent corrosion or the like. The partition wall 15 has a flat plate shape, but has a honeycomb structure of a thin stainless steel plate so as to withstand water pressure.

Each of the side walls 11 is made of a stainless steel plate. Since the tank body 1 is large, the side walls 11 are substantially formed from the overall structure of the tank body 1. It is a flexible member. Further, the planar shape of these side wall portions 11 is curved in an arc shape so as to bulge outward. This curved curve is preferably formed as a catenary curve or a curve similar thereto, for example, a parabola, an arc having a large radius of curvature, or the like. Therefore, when tap water is stored in the tank main body 1 and the water pressure acts on these side walls 11, horizontal tension acts on these side walls 11, and stresses other than this tension are substantially reduced. This does not occur on the side wall portion 11.

Each side wall 11 of the tank body 1
, That is, at the corners of the rectangular tank body 1, the side edges of the adjacent side walls 11 are joined to each other in a watertight manner.

A side pressure brace member 20 is provided at each of the intersections, that is, the joints. These side pressure brace members 20 are arranged outside the tank body 1 and are installed on, for example, a base member 24 constructed on the ground, and are configured to withstand a load acting in the horizontal direction.

Then, the two adjacent side wall portions 11
Is a resultant force toward the inside of the tank body 1 at this joint portion. Therefore, due to the hydraulic pressure, the joining portion of these side wall portions 11 is
Trying to deform inside. The side pressure brace member 20 is connected to the joining portion of the side wall portions 11, supports the resultant force, and prevents the joining portion from being deformed inward.

By the action of the lateral pressure brace member 20, these side walls 11 are held, and even when tap water is stored in the tank body 1, the side walls 11 have substantially only tension. Does not work. Further, these side wall portions 11 may be made of a relatively thin plate which can withstand only this tension. Further, since the joining portions of the side wall portions 11 are held by the side pressure brace member 20 as described above, even if the side wall portion 11 is a flexible member as described above, the entire tank body 1 is formed. Is not a flexible structure,
It is a substantially rigid structure. The strength of the lateral pressure brace member 20 and the strength of the base member 24 installed on the side pressure brace member 20 are set so as to obtain predetermined earthquake resistance.

In this embodiment, the side pressure brace member 20 is mounted on the base member 24, but the side pressure brace member 20 is mounted on the bottom wall 1 of the tank body 1.
The base member 3 may be installed on a base member integrated with the base member to be installed, or on a frame member holding the bottom wall portion 13 or the like.

In this embodiment, the side wall 1
The first and side pressure brace members 20 are configured as shown in FIGS. That is, the side pressure brace member 20 has a flat mounting flange member 22 which is arranged along the direction of the resultant force of the tension of the adjacent side wall portions 11 joined thereto. I have. The side edges of the side wall 11 are bent along both surfaces of the mounting flange member 22 to form mounting bent portions 25. These mounting bent portions 25 are overlapped on both surfaces of the mounting flange member 22, and a pressing member 26 is overlapped thereon and fastened by bolts 27 and nuts 28.

In this embodiment, the end faces of the mounting flange member 22 and the mounting bent portions 2 of these side wall portions 11 are used.
The base end of 5 is welded at the welded portion 29 to ensure watertightness therebetween, but it is also possible to ensure watertightness by interposing a packing or the like therebetween.

The side wall portion 11 in this embodiment is configured as shown in FIG. That is, the side wall 11 has a height of about 4 m, but a plurality of, for example, four strips 21 having a width of about 1 m are vertically arranged in parallel, and the edges of the strips 21 are joined by welding. I have.

The band plate material 21 is formed on the side wall portion 11.
Is used, for example, in this embodiment an integral one with a length of about 18 m or 16 m. Such a plurality of strips 21 can be wound in a roll and transported, which facilitates the construction of the tank and can be wound and transported as described above. 11-piece length can be used,
High strength against horizontal tension caused by water pressure.

In this embodiment, as shown in FIG. 8, the band plate members 21 whose thickness is larger downward as they correspond to the water pressure. That is, when water is stored in the tank body 1, the water pressure acting on these band members 21 is the head pressure from the water surface, and the water pressure acting on the lower band member 21 is higher. And in this embodiment, in response to this difference in water pressure, the lower strip 2
1 are made thicker so that the tensile stress caused by the tension acting on the inside of these strips 21 becomes equal.

Therefore, when the water pressure acts on each of the band members 21, the elongation amounts of the band members 21 are equal. For this reason, it is possible to prevent undesired deformation such that the lower band plate material 21 swells outward greatly and only the lower part of the side wall portion 11 swells. Prevent it from occurring. In addition, each of these strips 2
Since the tensile stresses 1 are substantially equal to each other, no shear load or the like is generated at the welded portions of the edges of the strips 21, and cracks, deformations, and the like of the welded portions are reliably prevented.

Further, as described above, these side wall portions 11 are previously curved in an arc shape outward with a catenary curve or a curve similar thereto. When a uniform water pressure, that is, a uniform load is applied to such flexible side wall portions 11, these side wall portions 11 are curved with the above-described catenary curve. Therefore, if these side wall portions 11 are not curved by this catenary curve or a curve similar thereto, when water is stored in the tank body 1 and water pressure acts, these side wall portions 11 will not be curved by this catenary curve. , And excessive deformation and load occur in each part. However, in this embodiment, since these side wall portions 11 are formed to be curved into a catenary curve or a curve similar to the catenary curve from the beginning, a new deformation does not occur even when water pressure acts. Unnecessary deformation of each part and generation of a load can be prevented.

The central portion of each side panel 3 of the cover 2 is close to the most bulged portion at the central portion of each of the side wall portions 11 and along the direction of the tangent line of the most bulged portion. The side pressure brace member 20 is accommodated in a joint portion, that is, a corner portion of the side panels 3. Therefore, the cover 2 surrounds the tank body 1 with a minimum dimension, and the installation area is minimized.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, in FIG.
The outline of the tank main body 1a of 2nd Embodiment which formed planar shape substantially triangular is shown, 11a in a figure is a side wall part, 20a
Is a side pressure brace member for holding these.

FIG. 10 schematically shows a tank body 1b according to a third embodiment in which a planar shape is formed in a hexagonal shape.
In the drawing, 11b is a side wall portion, and 20b is a side pressure brace member for holding them.

Further, as in a fourth embodiment shown in FIG. 11, it is possible to arrange a plurality of tank bodies 1 closely as in the first embodiment, for example. In this case, since these tank bodies 1 have, for example, a substantially polygonal shape, they can be arranged more densely than in the case of a cylindrical tank. When a plurality of tank bodies 1 are densely arranged in this manner, the side pressure brace members 20 of adjacent tank bodies 1 can be connected to each other to cancel the load acting on the side pressure brace members 20. It is.

The present invention is not limited to the above embodiments. For example, the plan shape of the tank body is
The shape is not limited to the above-described substantially square, triangular, and hexagonal shapes, but may be any other polygonal shape, and may be a planar shape that matches the shape of the site.

The storage tank of the present invention is not limited to the storage tank of tap water, but can be applied as a storage tank for other liquids or fluids such as powders and granules. Further, the material of each member such as the tank body of the present invention is not limited to stainless steel as described above, and may be formed of other materials such as a metal material and a fiber reinforced resin.

[0045]

As described above, according to the present invention, a substantially horizontal tension acts on the side wall due to the pressure of the stored material in the tank body, and the side wall is opposed to the pressure by the tension. It can be thin enough to withstand the tension, and can be made into a single large member as long as it has a small thickness and withstands the tension, and can be manufactured easily and at low cost. Further, since the resultant force of the tension at the intersection of these side walls is held by the rigid side structure brace member, the structure does not become a flexible structure as a whole, so that sufficient earthquake resistance can be obtained. Further, since the side pressure brace member is arranged outside the tank main body, there is no need to provide a frame member inside the tank main body, the inner surface thereof is simple and smooth, and cleaning and the like are easy. In addition, since this tank has a shape similar to a polygon in plan view, its effect is great, for example, it is possible to increase its internal volume relative to the installation area.

[Brief description of the drawings]

FIG. 1 is a plan view of a storage tank according to a first embodiment.

FIG. 2 is a side view of the storage tank according to the first embodiment.

FIG. 3 is a schematic sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a schematic sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a view taken in the direction of arrows 5-5 in FIG. 4;

FIG. 6 is a view taken in the direction of arrows 6-6 in FIG. 3;

FIG. 7 is a sectional view taken along the line 7-7 in FIG. 6;

FIG. 8 is a sectional view taken along line 8-8 in FIG. 6;

FIG. 9 is a schematic plan view of the second embodiment.

FIG. 10 is a schematic plan view of a third embodiment.

FIG. 11 is a schematic plan view of a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank main body 2 Cover 3 Side panel part 11 Side wall part 13 Bottom wall part 20 Side pressure brace member 21 Belt 22 Mounting flange member

Claims (8)

[Claims] A tank body having a plurality of side walls and having a plane shape similar to a polygon, wherein the side walls have flexibility and the plane shape is curved outwardly in an arc shape. A side pressure brace member which is disposed outside the tank body and holds an intersection where the side edges of adjacent side walls intersect with each other, and the side pressure brace member presses the pressure of the stored material in the tank body at the intersection. A holding tank for maintaining the resultant force of the horizontal tension generated on the side wall portion to prevent these intersections from being deformed toward the inside of the tank body. 2. The storage tank according to claim 1, wherein each of the side wall portions is formed of a separate member, and is joined to each other at the intersection. 3. The side wall portion is formed by arranging a plurality of strips in parallel in a vertical direction, and each strip is formed by a storage material stored in the tank body. 2. The storage tank according to claim 1, wherein the upper strip is formed to be thinner and the lower strip is formed to be thicker in accordance with the magnitude of the pressure applied to the storage tank. 4. The side pressure brace member has a mounting flange portion arranged along a direction of a resultant force of the tension of the adjacent side wall portions, and a side edge portion of the side wall portion is formed by the mounting flange portion. 3. The storage tank according to claim 2, wherein the storage tank is bent and attached to the mounting flange portion. 5. The storage tank according to claim 1, wherein said side wall portion is curved outwardly in a catenary curve or a curve similar thereto. 6. The storage tank according to claim 1, further comprising a cover surrounding the outside of the tank body. 7. The cover has a plurality of planar side panels, the planar shape of which is a polygon corresponding to the planar shape of the tank body, and the central part of each side panel is the tank body. The side wall portion is located near the maximum bulge portion at the center of the side wall portion and is arranged along the tangential direction of the maximum bulge portion, and the intersection of these adjacent side panel portions is located at the position of the side pressure brace member. 7. The storage tank according to claim 6, wherein said side pressure brace members are accommodated in corners of intersections of said side panel portions. 8. The tank body has four side walls, and has a quadrangular planar shape.
8. The storage tank according to claim 7, wherein the storage tank is provided with a plurality of side panels and has a square planar shape.