Method of supporting tank, method of manufacturing support structure for tank, and support structure for tank

Abstract

To support a tank stably.SOLUTION: A method of supporting a tank 1 includes placing the tank 1 on a concrete foundation 3 leaving a gap 5, filling the gap 5 with an urethane material 7 and foaming the same to form an urethane foam 9, and supporting the tank 1 with the urethane foam 9.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a tank support method, a method for manufacturing a tank support structure, and a tank support structure. [Background technology]

[0002] For example, Patent Document 1 considers a method for supporting a large tank on a concrete foundation. Another known example is a method in which a tank is placed on a concrete foundation and supported against the concrete foundation by bolts and spacers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-191085 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional method, the tank support is unstable, and therefore it is desirable to support the tank stably.

[0005] The present disclosure has been made in consideration of the above circumstances, and has an object to stably support a tank. The present disclosure can be realized in the following forms. [Means for solving the problem]

[0006] The tanks are placed on the concrete foundation with gaps between them. Filling the gap with a urethane material and foaming it to form a urethane foam; A tank supporting method, comprising supporting the tank with the urethane foam. Effect of the Invention

[0007] According to the present disclosure, the tank can be stably supported. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is an explanatory diagram showing a side surface of the tank. [Diagram 2] FIG. 2 is an explanatory diagram (cross-sectional view) showing the foundation. [Diagram 3] FIG. 1 is an explanatory diagram showing a tank placed on a foundation with a gap therebetween. [Figure 4] FIG. 13 is an explanatory diagram showing the state in which a urethane material is filled. [Diagram 5] FIG. 4 is an explanatory diagram showing a support structure of the tank. [Figure 6] 11A to 11C are explanatory diagrams showing a manufacturing method of the tank support structure. [Figure 7] 11A to 11C are explanatory diagrams showing a manufacturing method of the tank support structure. [Figure 8] 11A to 11C are explanatory diagrams showing a manufacturing method of the tank support structure. [Figure 9] 11A to 11C are explanatory diagrams showing a manufacturing method of the tank support structure. [Figure 10] 11A to 11C are explanatory diagrams showing a manufacturing method of the tank support structure. [Figure 11] 11A to 11C are explanatory diagrams showing a manufacturing method of the tank support structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Here, a preferred example of the present disclosure is given. [1] The tanks are placed on the concrete foundation with gaps between them. Filling the gap with a urethane material and foaming it to form a urethane foam; A tank supporting method, comprising supporting the tank with the urethane foam. [2] The bottom surface of the tank is dome-shaped and protrudes downward. A method of supporting a tank as described in [1], wherein the upper surface of the foundation has a concave portion that conforms to the shape of the bottom surface of the tank. [3] The tanks are placed on the concrete foundation with gaps between them. Filling the gap with a urethane material and foaming it to form a urethane foam; A manufacturing method of a tank support structure, in which the tank is supported by the urethane foam. [4] A concrete foundation and A tank installed on the foundation via a urethane foam, The urethane foam is adhered to the base and the tank, A tank support structure, in which the tank is supported by the urethane foam. [5] The bottom surface of the tank is dome-shaped and protrudes downward. The support structure for a tank described in [4], wherein the upper surface of the foundation has a concave shape that follows the shape of the bottom surface of the tank.

[0010] An example of a method for manufacturing a preferred tank support structure will now be given. The tanks are placed on the concrete foundation with gaps between them. Filling the gap with a urethane material and foaming it to form a urethane foam; A manufacturing method of a tank support structure, in which the tank is supported by the urethane foam, comprising the steps of: The urethane material is charged in a plurality of portions, A single dose of the urethane material is filled and foamed to form a foamed portion that contacts both the bottom surface of the tank and the foundation, and then A manufacturing method of a tank support structure, comprising filling the urethane material so as to be in contact with the foam portion.

[0011] It is also preferable to have the following steps [A][B][C][D]. In step [A], the second and subsequent filling times are repeated by filling the urethane material in positions farther from the central position toward the outside and foaming the material, thereby forming a foam that is continuous with the first foam portion; Step [B] When the outer edge of the foam reaches the edge position of the bottom surface and there is an unfilled gap that is the gap not filled with the foam, the foam is returned to the vicinity of the central position and filling is resumed so that the urethane material contacts the first foam portion, Each time the step [C] is repeated, the urethane material is sequentially filled into the unfilled gap so as to move away from the first foamed portion toward the outside, and foamed; Step [D] Repeat steps [B] and [C].

[0012] The present disclosure will be described in detail below. In this specification, when a numerical range is described using "-", the lower limit and the upper limit are included unless otherwise specified. For example, the description "10-20" includes both the lower limit "10" and the upper limit "20". In other words, "10-20" has the same meaning as "10 or more and 20 or less". In this specification, the upper limit and the lower limit of each numerical range can be arbitrarily combined.

[0013] 1. Tank 1 support method In the method of supporting the tank 1 of the present disclosure, the tank 1 is placed on a concrete foundation 3 with a gap 5 left therebetween, and then a urethane material 7 is filled into the gap 5 and foamed to form urethane foam 9, which supports the tank 1. The urethane material 7 is preferably filled using, for example, an injection nozzle 2.

[0014] (1) Tank 1 The shape, size, and material of the tank 1 are not particularly limited. For example, the tank 1 may be a cylindrical tank with a bottom, preferably a tank 1 having a dome shape with a bottom surface 1A protruding downward as shown in Fig. 1. From the viewpoint of ensuring rigidity, for example, a metal is preferably used as the material of the tank 1. As the metal, stainless steel having excellent corrosion resistance is preferably used. The capacity of the tank 1 is not particularly limited. There is no particular limitation on the content contained in the tank 1. The content is, for example, a liquid.

[0015] (2) Basics 3 There is no particular limitation on the type of concrete used to construct the foundation 3. There is no particular limitation on the shape of the foundation 3. 2, the upper surface 3A of the foundation 3 preferably has a concave portion R that is concave along the shape of the bottom surface 1A of the tank 1. By placing the tank 1 on the foundation 3 having such a concave portion R, the tank 1 can be supported on the foundation 3 more stably.

[0016] (3) Support for Tank 1 The tank 1 of the present disclosure is supported as follows. As illustrated in Figures 3, 4 and 5, the tank 1 is placed on a concrete foundation 3 with a gap 5 therebetween, and a urethane material 7 is filled into the gap 5 and foamed to form a urethane foam 9. The tank 1 is then supported by the urethane foam 9. It is preferable that the urethane foam 9 is bonded to both the bottom surface 1A of the tank 1 and the top surface 3A of the foundation 3. The method of supporting a tank 1 according to the present disclosure can be applied not only to a newly constructed tank 1 but also to an existing tank 1. That is, the method can be applied to either of the following cases: [1] When constructing a new tank 1, a foundation 3 is made of concrete and the tank 1 is placed on the foundation, and [2] When the tank 1 is already placed on an existing concrete foundation 3. The gap 5 exists between the bottom surface 1A of the tank 1 and the upper surface 3A of the foundation 3. The interval of the gap 5 is not particularly limited. The interval of the gap 5 is, for example, preferably 5 mm or more and 300 mm or less, and more preferably 10 mm or more and 100 mm or less. The interval of the gap 5 may be uniform or non-uniform.

[0017] There is no particular limitation on the method for placing the tank 1 on the concrete foundation 3 with the gap 5 therebetween. For example, the gap 5 can be formed by inserting a spacer (not shown) between the bottom surface 1A of the tank 1 and the top surface 3A of the foundation 3. As the spacer, for example, a nut can be used. The foundation 3 and the tank 1 may be temporarily fixed with fasteners (for example, a bolt and a nut).

[0018] The urethane material 7 is a liquid raw material of the urethane foam 9. The urethane material 7 is a mixture of two liquids, liquid A containing a polyol component and liquid B containing a polyisocyanate component. Liquid A may contain a foam stabilizer and other additives. The properties of the urethane material 7 are not particularly limited. From the viewpoint of workability on site, the cream time of the urethane material 7 is preferably 5 seconds or more and 25 seconds or less, and more preferably 10 seconds or more and 20 seconds or less. From the viewpoint of workability on site, the rise time of the urethane material 7 is preferably 20 seconds or more and 100 seconds or less, and more preferably 30 seconds or more and 60 seconds or less. Here, cream time means the time from when urethane material 7 is obtained by mixing liquid A and liquid B to when foaming starts, and rise time means the time from when urethane material 7 is obtained by mixing liquid A and liquid B to when foaming ends. The urethane material 7 preferably has a property of foaming 20 to 40 times, and more preferably 25 to 35 times. By utilizing this property, even if the gap 5 is narrow and it is difficult to inject the urethane material 7, the gap 5 can be filled with a sufficient amount of urethane foam 9. The filling rate of the urethane foam 9 in the gap 5 is not particularly limited. When the volume of the gap 5 is taken as 100%, the filling rate of the urethane foam 9 is preferably 90% or more, and more preferably 95% or more, from the viewpoint of stably supporting the tank 1. The upper limit is usually 100%. The urethane foam 9 is formed by foaming the urethane material 7, and is preferably made of a hard polyurethane foam. The compressive strength of the urethane foam 9 is not particularly limited. From the viewpoint of the strength and dimensional stability required for the tank support part, the compressive strength of the urethane foam 9 is set to 120 kN / m 2 The above is preferable, 130kN / m 2 More preferably, 150 kN / m or more 2 The above is more preferable. From the viewpoint of cost, the compressive strength of the urethane foam 9 is set at 220 kN / m 2 Less than 210kN / m is preferable. 2 Less than 200 kN / m is more preferable. 2The following is more preferable. In addition, the compressive strength conforms to JIS A9521:2017. The apparent core density of the urethane foam 9 is not particularly limited. The apparent core density of the urethane foam 9 is preferably 32 kg / m 3 or more from the viewpoints of dimensional stability and durability improvement, more preferably 34 kg / m 3 or more, and even more preferably 36 kg / m 3 or more. The apparent core density of the urethane foam 9 is preferably 44 kg / m 3 or less, more preferably 42 kg / m 3 or less, and even more preferably 40 kg / m 3 or less. In addition, the apparent core density was measured in accordance with JIS A9521:2017. At this time, as for the measurement sample (specimen), a specimen prepared from the core of the urethane foam after removing the skin layer in accordance with JIS K7222:2005 was used.

[0019] 2. Support structure 10 of tank 1 and manufacturing method thereof The support structure 10 of tank 1 includes a concrete foundation 3 and a tank 1 installed on the foundation 3 via a urethane foam 9. The urethane foam 9 adheres to the foundation 3 and the tank 1. The support structure 10 of tank 1 is a structure that supports the tank 1 by the urethane foam 9 (see Fig. 5). The manufacturing method of the support structure 10 of tank 1 is a manufacturing method in which a urethane material 7 is filled into a gap 5 and foamed to form a urethane foam 9 with a gap 5 left between the tank 1 and the concrete foundation 3.

[0020] (1) Citing the description in "1. Support method of tank 1" In the support structure 10 of tank 1 and its manufacturing method, with respect to "tank 1", "foundation 3", and "support of tank 1", the explanations in the column of "1. Support method of tank 1" are applied as they are, and the description thereof is omitted. That is, "tank 1", "foundation 3", and "support of tank 1" described in the item of "1. Support method of tank 1" are applied as they are.

[0021] (2) Preferred embodiment of the manufacturing method of the support structure 10 of the tank 1 In the manufacturing method, it is preferable to fill the urethane material 7 in multiple batches, fill one batch of the urethane material 7 and foam it to form a foamed portion P that contacts both the bottom surface 1A of the tank 1 and the foundation 3, and then fill the urethane material 7 so that it contacts the foamed portion P (see Figures 7 and 8). In this manufacturing method, adjacent foamed portions P are integrally connected to each other, so that urethane foam 9 with few voids can be formed. As a result, the filling rate of urethane foam 9 in gaps 5 can be improved, and the unity between tank 1 and foundation 3 can be strengthened. In addition, this manufacturing method makes it possible to construct support structure 10 that stably supports tank 1. The number of times that urethane material 7 is divided to be filled is not particularly limited.

[0022] A preferred example of the manufacturing method will be described with reference to Figures 6-11. In these figures, the gap 5 between the bottom surface 1A of the tank 1 and the upper surface 3A of the foundation 3 is shown as a dashed circle. The gap 5 is the space below the bottom surface 1A of the tank 1. In this manufacturing method, a single supply of urethane material 7 is filled and foamed to form a foamed portion P that contacts both the bottom surface 1A of the tank 1 and the foundation 3, and then the urethane material 7 is filled so that it contacts the foamed portion P. For example, when filling the urethane material 7 after forming the first foaming portion P1 that contacts both the bottom surface 1A of the tank 1 and the foundation 3, it is preferable to fill it so as to contact the already formed first foaming portion P1 (see Figs. 6 and 7). In other words, the urethane material 7 is injected so as to contact the already formed first foaming portion P1. The injected urethane material 7 is foamed to form the second foaming portion P2. In the example of the figure, similarly, the urethane material 7 is injected so as to contact the already formed second foaming portion P2, and the injected urethane material 7 is foamed to form the third foaming portion P3. The urethane material 7 is injected so as to contact the already formed third foaming portion P3, and the injected urethane material 7 is foamed to form the fourth foaming portion P4. The urethane material 7 is injected so as to contact the already formed first foaming portion P1, and the injected urethane material 7 is foamed to form the fifth foaming portion P5. The urethane material 7 is injected so as to contact the already formed fifth foaming portion P5, and the injected urethane material 7 is foamed to form the sixth foaming portion P6. The urethane material 7 is injected so as to be in contact with the already formed sixth foamed portion P6, and the injected urethane material 7 foams to form the seventh foamed portion P7.

[0023] In this example, the first filling is performed at a central position C of the gap 5, which is below the approximate center of the bottom surface 1A of the tank 1, and a first foaming portion P1 is formed at the central position C. After that, the following steps [A][B][C][D] are performed. In the second and subsequent filling steps of step [A], the urethane material 7 is filled and foamed at positions farther outward from the central position C, thereby forming a second foamed portion P2, a third foamed portion P3, and a fourth foamed portion P4. This step forms a foam 31 that is continuous with the first foamed portion P1, as shown in Figs. 8, 9, and 10. Step [B] Then, when the outer edge of the foam 31 reaches the edge position of the gap 5 (corresponding to the edge position of the bottom surface 1A) as shown in Fig. 10 and there is an unfilled gap 6, which is a gap 5 not filled with the foam 31, the foam 31 returns to the vicinity of the central position C and filling is resumed so that the urethane material 7 contacts the first foamed portion P1 as shown in Fig. 11. In this example, a fifth foamed portion P5 is formed. Each time the process [C] is repeated, the urethane material 7 is sequentially filled into the unfilled gaps 6 and foamed, moving away from the first foamed portion P1 toward the outside. In this example, a sixth foamed portion P6 and a seventh foamed portion P7 are formed. Step [D] Steps [B] and [C] are repeated. In this example, although not shown, the spaces remaining as the unfilled gaps 6 are sequentially filled with the urethane material 7 and foamed. In this manufacturing method, the gap 5 can be filled sufficiently with urethane foam 9, so that the tank 1 is supported more stably. If any unfilled gap 6 remains, the unfilled gap 6 may be filled with urethane foam 9, for example, as in the eighth foamed portion P8 in FIG. Furthermore, in the case where the urethane foam 9 protrudes laterally from under the bottom surface 1A of the tank 1, the protruding portion may be cut off as a finishing process.

[0024] 3. Effects of the Present Embodiment (Supporting Method, Manufacturing Method of Support Structure 10, Effects of Support Structure 10) According to this embodiment, the tank 1 and the foundation 3 are integrated with each other by the urethane foam 9 filled in the gap 5. Therefore, with this supporting method, the tank 1 is stably supported. Conventionally, the tank 1 and the foundation 3 were fixed and supported by a plurality of fasteners (e.g., bolts and nuts) arranged on the edge of the bottom surface of the tank 1. In this case, the tank 1 was supported only by the fasteners, and was unstable. In addition, in the conventional method, the mass of the contents in the tank 1 acted on the walls of the tank 1, such as the bottom wall, and the tank 1 was likely to be deformed or damaged. If the tank 1 was damaged, the contents were likely to leak out. According to this embodiment, the tank 1 is supported by the entire upper surface of the urethane foam 9, so that the tank 1 is stably supported. Also, according to this embodiment, even if the mass of the contents in the tank 1 acts on the bottom wall of the tank 1, the bottom wall of the tank 1 is supported by the urethane foam 9, so that the deformation and damage of the tank 1 are suppressed. Even if the bottom wall of the tank 1 is damaged, the urethane foam 9 deforms to fill the damaged area, so that the contents are less likely to leak out to the outside.

[0025] According to this embodiment, since the urethane foam 9 is used as the filler, the construction period can be significantly shortened compared to the case where other fillers are used. According to this embodiment, since concrete or the like is not used to support the tank 1, it is possible to significantly shorten the construction period and also to eliminate the need for large-scale construction work. According to this embodiment, permanent construction, in other words, making it into a permanent structure, can be achieved through simple construction. According to this embodiment, since large heavy machinery is not required, there are fewer limitations on the construction area and the construction period can be shortened. According to this embodiment, since large heavy machinery (such as a crane) is not required, construction can be carried out even in places where vehicles cannot enter. According to this embodiment, all construction can be done manually, which reduces the cost and shortens the construction period. According to this embodiment, all materials used are lightweight, so that transportation and installation can be done manually. According to this embodiment, since the urethane foam 9 is used as the filler, the following effects can be expected. The desired strength of the filler (urethane foam 9) is ensured within 24 hours, eliminating the need for curing after pouring. -Since urethane is a hardening resin, compaction is not required. · Because urethane can be foamed on site, the filling rate mentioned above can theoretically be increased to 100%. -Polyurethane foam 9 is extremely lightweight, minimizing the impact on the supporting ground. The adhesive effect of the urethane allows it to be integrated with surrounding components, making it possible to create a stable structure. -Since the construction equipment is simple, construction can be carried out even in places where it is difficult for vehicles to enter.

[0026] Moreover, the present embodiment has the following advantages in comparison with a method in which a foam that matches the shape of the tank is prepared in advance (for example, Japanese Patent Application Laid-Open No. 2000-191085). - Foaming occurs on-site, reducing the need to bring in large components. -Since it is possible to obtain a foam that matches the shape of the gap, stress concentration is less likely to occur when a load is applied.

[0027] The present invention is not limited to the above-described embodiments, and various modifications and variations are possible within the scope of the claims of the present invention. [Explanation of symbols]

[0028] 1. Tank 1A…Bottom surface 2...Injection nozzle 3…Fundamentals 3A…Top surface 5. Gap 6...Unfilled gap 7. Urethane material 9...Urethane foam 10...Support structure 31 ... Foam C…center position P … Foaming section P1 … First foaming section P2: Second foaming section P3: Third foaming section P4 … 4th foam section P5: 5th foam section P6 … 6th foam section P7...7th foam section P8…8th foam section R…Concave shape part

Claims

1. The tanks are placed on the concrete foundation with gaps between them. Filling the gap with a urethane material and foaming it to form a urethane foam; A tank supporting method, comprising supporting the tank with the urethane foam.

2. The bottom surface of the tank is dome-shaped and protrudes downward. The method for supporting a tank according to claim 1 , wherein the upper surface of the foundation has a concave portion that conforms to the shape of the bottom surface of the tank.

3. The tanks are placed on the concrete foundation with gaps between them. Filling the gap with a urethane material and foaming it to form a urethane foam; A manufacturing method of a tank support structure, in which the tank is supported by the urethane foam.

4. A concrete foundation and A tank installed on the foundation via a urethane foam, The urethane foam is adhered to the foundation and the tank, A tank support structure, in which the tank is supported by the urethane foam.

5. The bottom surface of the tank is dome-shaped and protrudes downward. The tank support structure according to claim 4, wherein the upper surface of the foundation has a concave shape that conforms to the shape of the bottom surface of the tank.

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