JP2013035599A - Liquid storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid storage tank which can be transported within a transportation limit of a transportation means and can achieve a volume exceeding the transportation limit at an installation site.SOLUTION: Tubular members 111-114 are sequentially stacked and are mutually jointed by mechanical coupling tools at joint parts 151-153. Each of the tubular members 111-114 is divided into split pieces 131-134, and the split pieces 131-134 are mutually jointed by the mechanical coupling tools. The bottom plate part 3 is divided into bottom-plate split pieces 311-315, and the bottom-plate split pieces 311-315 are mutually jointed by the mechanical coupling tools and joined to a bottom part of the tube part 1 by mechanical coupling tools. A cover part 5 is divided into cover split pieces 511-515, and the cover split pieces 511-515 are mutually joined by mechanical coupling tools and are attached to the upper part of the tube part 1.

Description

  The present invention relates to a liquid storage tank. The liquid storage tank according to the present invention is useful, for example, as a tank for storing radioactively contaminated water.

  At the nuclear power plant, which was severely damaged by the meltdown of fuel rods caused by the Great East Japan Earthquake and the massive tsunami that occurred on March 11, 2011, how was the large amount of radioactively contaminated water used for reactor cooling treated? How to store them is an urgent issue.

  From the viewpoint of storage of radioactive polluted water generated in large quantities every day, a tank with as large a capacity as possible is required. However, the tank must be transported from the tank manufacturing factory to the place where the nuclear power plant is located by means of transportation such as a transportation vehicle.

  For this reason, although a large capacity radioactively contaminated water storage tank is required, the capacity is determined by the transport limit of the transport means.

The radioactively contaminated water storage tank is required for the first time in the history of nuclear power generation in Japan, and there is no prior art document that can solve the above-mentioned problems. For example, Patent Document 1 discloses a radioactive waste storage tank, which is intended to store radioactive waste contaminated with radionuclides of a nuclear power plant, It does not take into account the storage of a large amount of radioactively contaminated water used for reactor cooling, and does not discuss the problem of the transport limit of transport vehicles etc. with respect to size (volume).
On the other hand, Patent Documents 2 to 5 disclose assembling tanks that can be transported, but in each case, the divided pieces of the cylindrical portion are directly coupled by bolts and nuts, etc. There is room for improvement in design flexibility such as improvement of mechanical strength and weight reduction.

JP 2010-66133 A JP 2009-12849 A JP 2010-111395 A JP 2001-278385 A JP-A-8-337293

  An object of the present invention is to provide a liquid storage tank that can be transported within the transport limit of the transport means and can realize a volume exceeding the transport limit at the installation site.

In order to solve the above-described problem, a liquid storage tank according to the present invention includes a cylindrical portion, a bottom plate portion, and a lid portion. The cylindrical portion is divided into a plurality of cylindrical members, and each of the cylindrical members is sequentially stacked and joined to each other by a mechanical coupler. Each of the cylindrical members is divided into a plurality of divided pieces.
The bottom plate portion is divided into a plurality of bottom plate divided pieces. Each of the bottom plate division pieces is joined to each other by a mechanical coupler, and is joined to the bottom of the cylindrical portion by a mechanical coupler.

The lid portion is divided into a plurality of lid divided pieces, and each of the lid divided pieces is joined to each other by a mechanical coupler and attached to the upper portion of the cylindrical portion.
Further, each of the divided pieces includes a reinforcing plate and a main body, and the reinforcing plate includes a base portion, a joining rib, and a plurality of reinforcing ribs. The joining rib is provided upright on one end part of the base part, and each of the reinforcing ribs stands up from one surface of the base part at a distance from each other, and the joining rib stands up. The surface is supported from a right angle. The reinforcing plate is joined to the outer surface of the main body so that one surface of the base portion faces outward and the joining ribs are at both ends in the circumferential direction of the divided pieces.

The adjacent divided pieces are joined by a mechanical coupler within the interval between the reinforcing ribs so that the joining ribs of the respective reinforcing plates face each other.
As described above, the liquid storage tank according to the present invention includes a cylindrical portion, and this cylindrical portion is divided into a plurality of cylindrical members, and each of the cylindrical members is further divided into a plurality of divided pieces. Is done. As a result, the cylindrical portion is divided into two stages, that is, division into cylindrical members and further division into cylindrical pieces. For this reason, the cylinder part which plays the main role which determines a tank volume will be subdivided into the division piece which has a shape and a size smaller than the transport limit of a transport vehicle etc.

  Even when the number of cylindrical members constituting the cylindrical portion and the inner peripheral radius thereof are increased and the tank volume finally obtained is increased, by selecting the size of the divided pieces, the size can be transported. Can keep.

Therefore, it can be transported within the transport limit of the transport vehicle, and a large-volume liquid storage tank exceeding the transport limit can be assembled at the installation site.
Each of the divided cylindrical members is sequentially stacked and joined to each other by a mechanical coupler, and the divided pieces of the adjacent cylindrical members are also joined to each other by the mechanical coupler. Therefore, the divided pieces transported from the production site to the installation installation site are assembled as a cylindrical member by joining them with a mechanical coupler such as a nut, a screw, or a bolt, and a plurality of cylindrical shapes obtained in this way. A cylindrical part can be constituted by stacking members sequentially and joining them with a mechanical coupler such as a nut, screw or bolt.

  Further, each of the divided pieces includes a reinforcing plate and a main body, and the reinforcing plate is joined to the outer surface of the main body. In this case, since the reinforcing plate and the main body can be manufactured in separate steps, it is possible to realize a divided piece with a high degree of design freedom.

  The reinforcing plate includes a base portion, joining ribs, and a number of reinforcing ribs. The joining rib is provided upright on the entire one end of the base portion, and each of the reinforcing ribs stands up from one surface of the base portion at a distance from each other, and the upstanding surface of the joining rib is seen from a right angle direction. I support it. In the reinforcing plate, one surface of the base portion faces outward, and the joining ribs are both ends in the circumferential direction of the divided pieces, and the adjacent divided pieces connect the joining ribs of the reinforcing plates to each other in the circumferential direction. Oppositely, they are joined by mechanical couplers within the spacing of the reinforcing ribs. According to such a structure, the mechanical coupling force of the joining portion of the split pieces increases, and the strength of the cylindrical member against the internal pressure can be increased.

  The cylindrical portion and the cylindrical member that is a constituent member thereof are typically cylindrical. If it is cylindrical, the internal pressure received from the liquid stored therein is made uniform over the entire circumference. Further, when the cylindrical member is divided, the cylindrical member can be configured by combining the divided pieces regardless of the position (division angle).

  Next, the bottom plate part is joined to the bottom part of the cylinder part. Thereby, a bottomed liquid storage tank is obtained. Since the bottom plate portion is joined to the bottom portion of the cylindrical portion by a mechanical coupler such as a nut, a screw, or a bolt, the joining operation can be easily performed using a general tool.

  Since the bottom plate part is divided into a plurality of bottom plate divided pieces, when the bottom plate part is enlarged in response to the increase in diameter of the cylindrical member, the enlarged bottom plate part is suitable for transportation. It can be divided into bottom plate divided pieces having different shapes and sizes.

  Since each of the bottom plate split pieces is joined to each other by a mechanical coupler, the bottom plate split pieces transported from the manufacturing site to the installation installation site are joined to each other by a mechanical coupler such as a nut, a screw, or a bolt. Thus, the bottom plate can be assembled, and the bottom plate thus obtained can be joined to the cylindrical portion by a mechanical coupling tool such as a nut, a screw, or a bolt. Therefore, the bottom plate portion can also be transported within the transport limit of the transport means, and a large-volume liquid storage tank exceeding the transport limit can be assembled at the installation site.

  The lid portion is divided into a plurality of lid divided pieces, and each of the lid divided pieces is joined to each other by a mechanical coupler and attached to the upper portion of the cylindrical portion. Thereby, a liquid storage tank with a bottomed lid is obtained. Since the lid is divided into a plurality of lid divided pieces, when the diameter of the lid is increased corresponding to the increase in the diameter of the cylindrical member, the enlarged lid is suitable for transportation. It can be divided into lid pieces having different shapes and sizes. Therefore, the lid can be transported within the transport limit of the transport means, and a large-volume liquid storage tank exceeding the transport limit can be assembled at the installation site.

  Since each of the lid split pieces is joined to each other by a mechanical coupler, the lid split pieces transported from the manufacturing site to the installation installation site are joined to each other by a mechanical coupler such as a nut, a screw, or a bolt. As a result, the lid can be easily assembled.

Each of the mechanical connectors preferably has a mechanical strength that increases as it approaches the bottom of the cylinder from the top of the cylinder. Inside the tank, the water pressure increases toward the bottom, and the possibility of water leakage increases.However, when each piece is joined by such a mechanical connector, a high pressure resistant tank corresponding to the increase in the internal water pressure is installed. Realize and enhance the water leakage prevention effect.
According to the present invention, even a liquid storage tank having a large volume of 1200 m ³ or more can be easily realized while ensuring pressure resistance. Such a large-capacity liquid storage tank is urgently required particularly for an application for storing radioactively contaminated water.

  As described above, according to the present invention, it is possible to provide a liquid storage tank that can ensure the maximum volume while satisfying transportability.

  Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are merely examples.

It is a front view of the liquid storage tank concerning the present invention. In the liquid storage tank of FIG. 1, it is a figure which expands and shows the joining structure of a cylinder part. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is a top view of the division piece which comprises the liquid storage tank shown in FIG. It is a front view of the division piece shown in FIG. In the liquid storage tank of FIG. 1, it is a figure which shows the lamination | stacking correlation of a cylindrical member. It is a top view of the baseplate part which comprises the liquid storage tank shown in FIG. FIG. 8 is an enlarged view showing a joining structure of the bottom plate divided pieces in the bottom plate portion of FIG. 7. It is a top view of the cover part which comprises the liquid storage tank shown in FIG. It is a partial defect | planar top view of the walk part which comprises the liquid storage tank shown in FIG.

  Referring to FIG. 1, the liquid storage tank according to the present invention includes a cylindrical portion 1, a bottom plate portion 3, and a lid portion 5. FIG. 1 further shows a walkway portion 7 on which a human can walk and a ladder 9 for climbing the walkway portion 7. These are all made of a metal material such as iron.

The cylindrical portion 1 is divided into four parts, a first cylindrical member 111 to a fourth cylindrical member 114 having the same diameter (inner diameter) D1. Each of the first cylindrical member 111 to the fourth cylindrical member 114 is sequentially stacked and joined (coupled) to each other at the joint portions 151 to 153. The cylinder part 1 is cylindrical. In the case of storing radioactively contaminated water, preferable dimensions are such that the inner diameter D1 is, for example, 12 m or more, and the height H1 of the cylindrical portion 1 is, for example, 10 m or more. According to the inner diameter D1 and the height H1, a large-capacity liquid storage tank of 1200 m ³ or more can be realized. Such a large capacity radioactively contaminated water storage tank is not known. However, the first cylindrical member 111 to the fourth cylindrical member 114 are not limited to four, and more cylindrical members can be stacked according to the required tank volume, The inner diameter D1 can also be selected to a larger value.

  In the completed state, the large-capacity liquid storage tank as described above cannot be transported from the manufacturing factory to the installation site even by the currently known transport vehicle having the maximum loading capacity. It is an object of the present invention to solve this problem. Therefore, the following description is directed to a specific structure for solving this problem.

  In the embodiment of FIG. 1, the second tubular member 112 is stacked on the first tubular member 111 whose bottom is closed by the bottom plate portion 3, and the third tubular member is placed on the second tubular member 112. The fourth cylindrical member 114 is stacked on the third cylindrical member 113, and the first cylindrical member 111 to the fourth cylindrical member 114 are joined at the joining portions 151 to 153 on the mating surfaces of the stack. is there.

  The joints 151 to 153 are realized by a mechanical coupler such as a nut, a screw, or a bolt. More specifically, as shown in FIGS. 2 and 3, first and second flange portions 191 and 192 are provided at the upper and lower ends in the axial direction of the first tubular member 111 to the fourth tubular member 114. The first and second flange portions 191 and 192 are brought into contact with each other, and are fastened and fixed by the mechanical coupler 21 described above. Between the opposing surfaces of the first collar part 191 and the second collar part 192, a gasket for preventing leakage can be interposed.

  Each of the first cylindrical member 111 to the fourth cylindrical member 114 is divided into four parts, a first divided piece 131 to a fourth divided piece 134. As shown in FIGS. 4 and 5, the first cylindrical member 111 to the fourth cylindrical member 114 are divided at the division angle θ = 90 degrees to form the first divided piece 131 to the fourth divided piece 134. . As shown in FIGS. 2 and 3, the first divided piece 131 to the fourth divided piece 134 are joined using a mechanical coupler 23 such as a nut, a screw, or a bolt. The magnitude | size of the 1st division | segmentation piece 131-the 4th division | segmentation piece 134 becomes a dimension smaller than the conveyance limit shape by conveyance means, such as a conveyance vehicle.

  The mechanical coupler 21 and the mechanical coupler 23 are preferably increased in mechanical strength as they approach the bottom from the upper part of the cylinder part. That is, the mechanical strengths of the mechanical coupler 21 and the mechanical coupler 23 are the joint portions 171 to 174 of the fourth tubular portion 114, the joint portion 153, the joint portions 171 to 174 of the third tubular portion 113, and the joints. Part 152, joining parts 171 to 174 of the second tubular part 112, joining part 151, joining parts 171 to 174 of the first tubular part 111 are in this order.

  For example, the diameters of bolts used as the mechanical coupler 21 and the mechanical coupler 23 are about 18 mm at the joints 171 to 174 and the joint 151 of the first tubular part 111, and the joint 171 of the second tubular part 112. ˜174 and the joint portion 152 are about 15 mm, the joint portion 171 to 174 and the joint portion 153 of the third cylindrical portion 113 are about 12 mm, and the joint portion 171 to 174 of the fourth tubular portion 114 is about 12 mm or less. Can be adopted. Moreover, mechanical strength can also be adjusted by material selection, such as selectively using materials, such as steel and stainless steel, for every junction part.

  2 and 3 show the second cylindrical member 112 of the joining structure of the first tubular member 111 to the fourth tubular member 114 and the joining structure of the first divided piece 131 to the fourth divided piece 134. The joining structure of the 3rd cylindrical member 113 and the joining structure of the 1st division piece 131 and the 4th division piece 134 in the 2nd cylindrical member 112 are shown typically.

  Referring to the figure, the second flange 192 provided on the upper end side of the second tubular member 112 and the first flange 191 provided on the lower end side of the third tubular member 113 are joined at the joint 152. , And are fastened and fixed by a mechanical coupler 21 such as a nut, screw or bolt. The arrangement pitch of the mechanical coupler 21 is not limited, but is preferably around 140 to 150 mm.

About the joining structure of the 1st division piece 131 and the 4th division piece 134 in the 2nd cylindrical member 112, in the joining end part of the main body 181 of the 4th division piece 134 and the main body 181 of the 1st division piece 131, the outer surface The reinforcing plates 182 and 183 are joined to each other.
The reinforcing plates 182 and 183 are both ends in the circumferential direction of the first divided piece 131 and the fourth divided piece 134, and are joined by welding. At the time of welding, a reduction in strength due to welding can be reduced by applying a process for reducing residual stress such as shot spinning to the joint portion. Further, since the reinforcing plate can be manufactured in a separate process from the divided piece main body, it is possible to realize a divided piece having a high degree of design freedom such as a form in which the divided piece main body is reduced in weight by adjusting the strength of the reinforcing plate portion.

  A large number of reinforcing ribs 197 and 198 and joining ribs 193 and 195 are provided on the surfaces of the base portions 194 and 196 of the reinforcing plates 182 and 183. In the region where the reinforcing ribs 197 and 198 are not provided, the first divided piece is provided. The joining rib 193 of 131 and the joining rib 195 of the fourth divided piece 134 are clamped by the mechanical coupler 23 and joined together.

  The joining ribs 193 and 195 are provided upright on one end portion of the base portions 194 and 196, and are opposed to each other between the first divided piece 131 and the fourth divided piece 134, and the first divided portion. Both ends of the piece 131 and the fourth divided piece 134 are formed. Each of the reinforcing ribs 197 and 198 is erected from one surface of the base portions 194 and 196 at a distance from each other, and supports the erected surfaces of the joining ribs 193 and 195 from a right angle direction. Further, one surface of the base portions 194 and 196 on which the reinforcing ribs 197 and 198 stand is arranged facing outward. The joining ribs 193 and 195 and the reinforcing ribs 197 and 198 can be joined to the base portions 194 and 196 by a technique such as welding.

  The mechanical joint structure between the first tubular member 111 and the second tubular member 112 and between the third tubular member 113 and the fourth tubular member 114 is also the structure described above. The mechanical joint structure between the first divided piece 131 and the second divided piece 132, the second divided piece 132 and the third divided piece 133, and the third divided piece 133 and the fourth divided piece 134 is also divided into the first divided piece. The joining structure of the piece 131 and the fourth divided piece 134 is the same.

  In stacking and joining the first cylindrical member 111 to the fourth cylindrical member 114, as shown in FIG. 6, the second cylindrical member 112 is flattened against the first cylindrical member 111 that is the first stage. Stack with 45 degrees rotated at the corners. The same applies to the relationship of the third cylindrical member 113 with respect to the second cylindrical member 112 and the relationship of the fourth cylindrical member 114 with respect to the third cylindrical member 113. Thereby, when the cylinder part 1 is planarly viewed, a well-balanced structure is realized in which the joining parts 171 to 174 are sequentially arranged at an angle of 45 degrees in the stacking direction.

  Next, as shown in FIGS. 7 and 8, the bottom plate portion 3 is divided into five parts, that is, a first bottom plate divided piece 311 to a fifth bottom plate divided piece 315. The number of divisions of the first bottom plate division piece 311 to the fifth bottom plate division piece 315 is such that the largest one of the first bottom plate division piece 311 to the fifth bottom plate division piece 315 is smaller than the transport limit of the transportation vehicle or the like. To be selected.

Each of the first bottom plate divided piece 311 to the fifth bottom plate divided piece 315 is joined to each other by the mechanical coupler 25. And as shown in FIG. 1, the junction part 154 is formed in the bottom part of the cylinder part 1 with mechanical coupling tools, such as a nut, a screw | thread, or a volt | bolt.
The bolt as the mechanical coupler 25 is preferably equal to or larger than the diameter of the bolt of the joints 171 to 174 in the first tubular member 111. For example, when the diameter of the bolt at the joints 171 to 174 is about 18 mm, the diameter is larger than that.

  As shown in FIG. 8, each of the first bottom plate divided piece 311 to the fifth bottom plate divided piece 315 is provided with a large number of reinforcing ribs 333 in a direction orthogonal to the dividing direction. FIG. 8 shows the details of the joining structure of the second bottom plate divided piece 312 and the third bottom plate divided piece 313 among the first bottom plate divided piece 311 to the fifth bottom plate divided piece 315. Referring to FIG. 8, the joining rib 331 of the second bottom plate split piece 312 and the joining rib 332 of the third bottom plate split piece 313 are joined by the mechanical coupler 25. The pitch interval of the reinforcing ribs 333 and the number of mechanical couplers 25 that fall within the pitch interval are arbitrary. In this embodiment, as an example, five mechanical couplers 25 are arranged within the pitch interval of the reinforcing ribs 33.

  As illustrated in FIG. 9, the lid 5 is divided into a first lid divided piece 511 to a fifth lid divided piece 515, and each of the first lid divided piece 511 to the fifth lid divided piece 515 is a machine. They are joined to each other by a mechanical coupler and attached to the upper part of the cylindrical portion 1. The specific structure of the lid 5 is similar to the bottom plate 3. As for the number of divisions of the first lid division piece 511 to the fifth lid division piece 515, the largest one of the first lid division piece 511 to the fifth lid division piece 515 is smaller than the transportation limit shape of the transportation vehicle or the like. Is selected as follows.

Each of the first lid divided pieces 511 to the fifth lid divided pieces 515 is provided with a large number of reinforcing ribs 533 in a direction orthogonal to the dividing direction. The pitch interval of the reinforcing ribs 533 and the number of mechanical couplers that fall within the pitch interval are arbitrary.
Further, referring to FIG. 10, the walkway portion 7 has a donut shape having a through hole 73 in the center, and has a structure in which a tread surface 71 made of a wire mesh or the like is provided around the through hole 73. Yes. The tread surface 71 is supported by a support arm 72 from below. As shown in FIG. 1, the corridor portion 7 is disposed on the upper portion of the tube portion 1 and is stably disposed on the upper portion of the tube portion 1 by a support arm 71 in contact with the outer peripheral surface of the tube portion 1. Supported.

  As described above, the liquid storage tank according to the present invention includes the cylindrical portion 1, which is divided into a plurality of cylindrical members 111 to 114, and each of the cylindrical members 111 to 114. Is divided into a plurality of divided pieces 131-134. As a result, the cylindrical portion 1 is divided into the cylindrical members 111 to 114, and further divided into two stages: the cylindrical members 111 to 114 are divided into a plurality of divided pieces 131 to 134. For this reason, the cylinder part 1 which plays the main role which determines a tank volume will be subdivided into the division | segmentation piece which has a magnitude | size which can be conveyed with a transport vehicle etc. FIG.

  Even when the number of divided pieces 131 to 134 constituting the cylindrical portion 1 and the inner diameter D1 thereof are increased and the tank volume finally obtained is increased, the number of divisions in the two-stage division is set, and the obtained divided pieces 131 are obtained. By selecting a size of ˜134, the size can be maintained. Therefore, the cylindrical portion 1 can be transported within the transport limit of the transport means, and a large-volume liquid storage tank exceeding the transport limit can be assembled at the installation site.

  Each of the divided pieces 131 to 134 divided into a plurality is joined to each other by the mechanical coupler 23 via the joining ribs 193 and 195, and each of the cylindrical members 111 to 114 is also joined to the mechanical coupler 21. Are joined together. Therefore, in the form of divided pieces 131 to 134, the cylindrical members 111 to 114 are transported from the manufacturing site to the installation and installation site, and joined at the installation site by a mechanical coupler 23 such as a nut, a screw, or a bolt. The cylindrical portion 1 can be configured by assembling and sequentially stacking the plurality of cylindrical members 111 to 114 obtained in this manner and joining them together by a mechanical coupler 21 such as a nut, a screw, or a bolt. it can. Since the divided pieces 131 to 134 have the reinforcing plates 181 and 182, the mechanical strength of the reinforcing plates 182 and 183 can be adjusted, and the weight of the main body 181 can be reduced. Therefore, weight reduction of the division pieces 131-134 is implement | achieved, and reduction of a conveyance cost etc. is attained.

  In an Example, the cylindrical part 1 and the cylindrical members 111-114 which are the structural members are cylindrical. If it is cylindrical, the internal pressure received from the liquid stored therein is made uniform over the entire circumference. Further, when the cylindrical members 111 to 114 are divided, the cylindrical members 111 to 114 can be configured by combining the divided pieces 131 to 134 regardless of the position (division angle).

  Next, the bottom plate part 3 is joined to the bottom part of the cylinder part 1. Thereby, a bottomed liquid storage tank is obtained. Since the bottom plate part 3 is joined to the bottom part of the cylinder part 1 by a mechanical coupler such as a nut, a screw or a bolt, the joining work can be easily performed using a general tool.

  And since the baseplate part 3 is divided | segmented into the some baseplate division | segmentation piece 311 to 315, when the baseplate part 3 is enlarged in diameter corresponding to enlargement of the cylindrical members 111-114, it is large diameter. The formed bottom plate portion 3 can be divided into bottom plate divided pieces 311 to 315 having shapes and sizes suitable for transportation. Accordingly, the bottom plate portion 3 is transported within the transport limit of the transport means, and can contribute to the assembly of a large-volume liquid storage tank that exceeds the transport limit at the installation site.

  Since each of the base plate split pieces 311 to 315 is joined to each other by the mechanical coupler 25, the base plate split pieces 311 to 315 transported from the manufacturing site to the installation and installation site are replaced with a machine such as a nut, a screw, or a bolt. The base plate 25 can be assembled as a bottom plate by being joined to each other by the mechanical coupler 25, and the bottom plate 25 thus obtained can be joined to the cylinder portion 1 by a mechanical coupler such as a nut, a screw, or a bolt.

  The lid portion 5 is divided into a plurality of lid division pieces 511 to 515, and each of the lid division pieces 511 to 515 is joined to each other by a mechanical coupler in the same manner as the bottom plate portion 3. Is attached. Thereby, a liquid storage tank with a bottomed lid is obtained. Thus, since the cover part 5 is divided | segmented into the some cover division | segmentation piece 511-515, when the cover part 5 is enlarged in diameter corresponding to enlargement of the cylindrical members 111-114, The large-diameter lid portion 5 can be divided into lid split pieces 511 to 515 having shapes and sizes suitable for transportation. Accordingly, the lid 3 can also be transported within the transport limit of the transport means, and can contribute to the assembly of a large-volume liquid storage tank that exceeds the transport limit at the installation site.

  Since each of the lid split pieces 511 to 515 is joined to each other by a mechanical coupler, the lid split pieces transported from the manufacturing site to the installation / installation site are joined by mechanical couplers such as nuts, screws, or bolts. By joining together, it can be easily assembled as a lid. Similarly, the corridor portion 9 can be shaped smaller than the transport limit of the transport vehicle or the like.

Therefore, according to the present invention, even a liquid storage tank having a large volume of 1200 m ³ or more can be easily assembled at the installation site. Such a large-capacity liquid storage tank is currently urgently demanded, particularly for applications that store radioactively contaminated water.

  The divided pieces 131 to 134, the cylindrical members 111 to 114 that combine them, the bottom plate divided pieces 311 to 315, and the bottom plate portion 3, the lid portion 7 and the walkway portion 9 that combine them are all made of metal such as iron. Is heavy. Therefore, in the assembly process, it is necessary to use a crane vehicle or the like, but since it is an easy work process for operating the mechanical couplers 21 to 25 such as nuts, screws or bolts, it is difficult to assemble. There is no.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Tube part 111-114 Cylindrical member 131-134 Divided piece 181 Main body 182,183 Reinforcement plate 193,195 Joint rib 194,196 Base part 197,198 Reinforcement rib 3 Bottom plate part 311-315 Bottom plate divided piece 5 Lid part 511 515 Lid piece

Claims (5)

A liquid storage tank including a tube portion, a bottom plate portion, and a lid portion,
The cylindrical portion is divided into a plurality of cylindrical members,
Each of the cylindrical members are sequentially stacked and joined together by a mechanical coupler,
Each of the cylindrical members is divided into a plurality of divided pieces,
The bottom plate portion is divided into a plurality of bottom plate divided pieces,
Each of the bottom plate split pieces is joined to each other by a mechanical coupler, and joined to the bottom of the tube portion by a mechanical coupler,
The lid portion is divided into a plurality of lid division pieces,
Each of the lid split pieces is joined to each other by a mechanical coupler, and is attached to the upper part of the cylindrical portion,
Further, each of the divided pieces includes a reinforcing plate and a main body,
The reinforcing plate includes a base portion, a joining rib, and a number of reinforcing ribs,
The joining rib is provided upright on the entire end portion of the base portion,
Each of the reinforcing ribs erected from one surface of the base portion at a distance from each other, and supports the erected surface of the joining rib from a right angle direction,
The reinforcing plate is joined to the outer surface of the split piece main body so that one surface of the base portion faces outward and the joining ribs are both ends in the circumferential direction of the split pieces,
The adjacent divided pieces are joined by a mechanical coupler within the interval between the reinforcing ribs, with the joining ribs of the reinforcing plates facing each other.
Liquid storage tank. A liquid storage tank according to claim 1,
Each of the mechanical connectors has a mechanical strength that increases as it approaches the bottom of the tube from the top of the tube.
Liquid storage tank. A liquid storage tank according to claim 1 or 2,
The cylindrical portion is cylindrical,
The bottom plate portion and the lid portion have a circular outer shape.
Liquid storage tank. The liquid storage tank according to claim 1, wherein the liquid storage tank has a volume of 1200 m ³ or more.   The liquid storage tank according to claim 1, wherein the liquid storage tank stores radioactively contaminated water.

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