JP2015196502A - Liquid storage tank and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect leakage of liquid before the liquid from the tank leaks to an exterior part of a predetermined management area.SOLUTION: A liquid storage tank 10 includes: a liquid retaining body having a bottom part, a side part connected with the bottom part, and a ceiling facing the bottom part and connected with the side part, the liquid retaining body retaining a liquid in a space enclosed by the bottom part, the side part, and the ceiling; a support member attached to the side of the bottom part which is opposite to a portion facing the ceiling; a detection space provided between the bottom part and the support member; and a detection device which detects the liquid existing in the detection space.

Description

  The present invention relates to a liquid storage tank that stores liquid such as waste water.

  A tank for storing radioactively contaminated water formed by joining a plurality of members by a mechanical coupler is described.

JP 2013-35599 A

  It is necessary to detect and manage the contaminated water stored in the tank before it leaks outside the predetermined management area.

  An object of the present invention is to detect the leakage of liquid before the liquid from a tank leaks outside a predetermined management area.

  The present invention includes a bottom portion, a side portion coupled to the bottom portion, and a ceiling facing the bottom portion and coupled to the side portion, and a liquid is contained in the space surrounded by the bottom portion, the side portion, and the ceiling. A liquid holding body that holds the liquid, a support member that is attached to a side of the bottom opposite to the portion facing the ceiling, and a detection space that is provided between the bottom and the support member. It is a storage tank. With such a structure, when a liquid such as contaminated water held in the liquid holding body leaks, the liquid first flows into the detection space, so that the liquid is detected by the detection device. As a result, the leakage of the liquid can be detected before the liquid from the tank leaks to a predetermined management area, for example, the outside of the liquid storage tank.

  In the normal example described in the prior art document, the liquid holder is manufactured by fastening a steel material with a bolt or the like. However, since there is a concern about leakage from a gap, it is preferably manufactured by welding. In this way, leakage from the liquid holder can be reduced.

  The detection space is preferably a passage provided in at least one of a portion of the support member facing the bottom portion and a portion of the bottom portion facing the support member. If it does in this way, the space for detection can be provided easily.

  It is preferable that the bottom portion is manufactured by welding a plurality of members, and the groove is provided at a position corresponding to a welding line of the bottom portion of the support member. In this way, since the liquid leaking from the welded portion surely flows into the detection space, the liquid leakage can be more reliably detected before the liquid from the tank leaks to the outside of the liquid storage tank. it can.

  The detection space has one or more partition members between the bottom portion and the support member, and a space between the bottom portion and the support member is surrounded by a surrounding member. You may have a magnitude | size beyond a bottom part.

  The detection device is provided to extend from a part of the detection space to a position farther from the ground surface than the upper end of the liquid holding body, and is provided so as to be able to move in the pipe and has a smaller specific gravity than the liquid. It is preferable to contain. By doing in this way, since the liquid in a pipe | tube reaches only the height of a liquid holding body at the maximum, the leakage of the liquid in a pipe | tube can be suppressed.

  The present invention suspends an existing liquid storage tank, and has a plate-like member having one or more grooves or liquid channels on the surface facing the existing liquid storage tank below the existing liquid storage tank. It is a manufacturing method of the liquid storage tank which installs and couple | bonds the said plate-shaped member and the said existing liquid storage tank. According to this method for manufacturing a liquid storage tank, since a detection space can be provided at the bottom of an existing tank, the existing tank is remodeled into a tank that can detect liquid leakage before the liquid leaks. it can.

  The present invention can detect the leakage of the liquid before the liquid from the tank leaks outside the predetermined management area.

FIG. 1 is a perspective view of a tank according to the present embodiment. FIG. 2 a is a perspective view of the constituent members of the tank according to the present embodiment. FIG. 2 b is a perspective view of the constituent members of the tank according to the present embodiment. FIG. 2c is a perspective view of the constituent members of the tank according to the present embodiment. FIG. 3 is a plan view showing a bottom portion and a support member. FIG. 4a is an illustration of a water detector in a double bottom. FIG. 4b is an illustration of a water detector in a double bottom. FIG. 4c is an illustration of a water detector in a double bottom. FIG. 4d is an illustration of a water detector in a double bottom. FIG. 4e is an illustration of a water detector in a double bottom. FIG. 5a is a perspective view of an example using a partition wall. FIG. 5b is a perspective view of an example using a partition wall. FIG. 6 is a flowchart showing an example of a method for manufacturing a liquid storage tank according to the present embodiment. FIG. 7 a is a diagram for explaining an example of a method for manufacturing a liquid storage tank according to the present embodiment. FIG. 7 b is a diagram for explaining an example of the method for manufacturing the liquid storage tank according to the present embodiment. FIG. 7 c is a diagram for explaining an example of the method for manufacturing the liquid storage tank according to the present embodiment. FIG. 7d is a view for explaining an example of the method for manufacturing the liquid storage tank according to the present embodiment. FIG. 7e is a diagram for explaining an example of the method for manufacturing the liquid storage tank according to the present embodiment. FIG. 7f is a diagram for explaining an example of a method for manufacturing a liquid storage tank according to the present embodiment. FIG. 8a is a diagram showing a modification of the groove. FIG. 8 b is a diagram showing a modification of the groove. FIG. 8c is a diagram showing a modification of the groove.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a tank according to the present embodiment. 2a to 2c are perspective views of components of the tank according to the present embodiment. FIG. 3 is a plan view showing a bottom portion and a support member. 4a to 4e are explanatory views of the water detection device in the double bottom. 5a and 5b are perspective views of examples using partition walls. FIG. 6 is a flowchart showing an example of a method for manufacturing a liquid storage tank according to the present embodiment. 7a to 7f are diagrams for explaining an example of a method for manufacturing a liquid storage tank according to the present embodiment. 8a to 8c are diagrams showing modifications of the groove.

  As shown in FIGS. 1 and 2 a, the liquid storage tank 10 includes a liquid holder 11, a groove (passage or fluid passage) 26 as a detection space, a detection device 13, and a support member 24. . The liquid holding body 11 includes a bottom portion 21, a side portion 22 coupled to the bottom portion 21, and a ceiling 23 that faces the bottom portion 21 and is coupled to the side portion 22. In the present embodiment, the bottom 21 and the ceiling 23 are plate-like members. The bottom 21 and the ceiling 23 have a circular shape when seen from a plan view, that is, from a direction orthogonal to the plate surface of the plate-like member.

  In the present embodiment, the bottom 21 and the ceiling 23 are not limited to a circular shape in plan view. For example, the bottom 21 and the ceiling 23 may be a polygon such as a triangle, a quadrangle, a pentagon, or a hexagon in plan view, or may be an ellipse.

  In the present embodiment, the bottom 21 is manufactured by welding a plurality of steel plates 21P as shown in FIG. 2c. The ceiling 23 is also manufactured by welding a plurality of steel plates 23P as shown in FIG. 2b.

  In this embodiment, the side part 22 is a cylindrical structure as shown in FIG. 2a. The side portion 22 has a bottom portion 21 attached to one end portion and a ceiling 23 attached to the other end portion. In this embodiment, the side part 22 is attached to these in the form where the bottom part 21 and the ceiling 23 do not protrude from the side part 22 along the circumferential direction of the outer edge of the bottom part 21 and the ceiling 23. Alternatively, at least one of the bottom portion 21 and the ceiling 23 may be attached along the circumferential direction of the outer edge of the side portion 22 so as to protrude from the side portion 22. Since the bottom part 21 and the ceiling 23 are circular in plan view, the side part 22 is a cylindrical structure. The side part 22 is manufactured by joining a plurality of steel plates 27 by welding.

  As shown in FIG. 2 a, the liquid holder 11 stores liquid in a space 28 surrounded by the bottom portion 21, the side portion 22, and the ceiling 23. Hereinafter, the space 28 is appropriately referred to as a liquid storage space 28. In the present embodiment, the liquid stored in the liquid storage space 28 is water, but is not limited to this.

  As shown in FIG. 2 a, the support member 24 is attached to the opposite side of the portion of the bottom portion 21 that faces the ceiling 23. In the present embodiment, the support member 24 has a circular shape in plan view, similar to the shape of the bottom portion 21 in plan view. In the present embodiment, as shown in FIG. 3, it is preferable that an outer edge 21 </ b> E of the bottom portion 21 is provided inside the outer edge 24 </ b> E of the support member 24 or at a position of the outer edge 24 </ b> E. In this way, manufacture becomes easy. The outer edge 21E of the bottom portion 21 may be provided at a position inside the outer edge 24E of the support member 24. The shape of the support member 24 in plan view is not limited to a circle. The support member 24 and the bottom 21 are joined by welding, for example. In this case, the outer edge 24E of the support member 24 and the outer edge 21E of the bottom 21 are welded along the circumferential direction of both. If the outer edge 21E of the bottom 21 is provided inside the outer edge 24E of the support member 24 or at the position of the outer edge 24E, welding of the support member 24 and the bottom 21 is facilitated.

  In the present embodiment, a groove 26 is provided between the bottom 21 of the liquid holding body 11 and the support member 24 as shown in FIG. The groove 26 is formed by digging the surface of the support member 24 on the bottom 21 side of the liquid holder 11 to a predetermined depth. The groove 26 is a detection space formed between the bottom 21 and the support member 24. Both ends of the groove 26 open to the outer edge 24E of the support member 24, but at least one end of the groove 26 only needs to open to the outer edge 24E of the support member 24. The support member 24 has a plurality of grooves 26, but the support member 24 only needs to have at least one groove 26.

  The volume of the liquid storage space 28 described above is larger than the volume of the detection space. The volume of the detection space in the present embodiment is the sum of the volume of all the grooves 26 included in the support member 24 and the volume of the gap between the opposite surface of the bottom 21 facing the ceiling 23 and the support member 24. It is. It is desirable that at least a part of the groove 26 is provided in parallel with the weld line 29 of the bottom portion 21. The groove 26 may be provided on the bottom 21 side, but this is not the case.

  In this embodiment, with respect to the opening 30 where the groove 26 is in contact with the outer peripheral portion of the bottom portion 21, except for one, it is filled with, for example, welding. In manufacturing, the groove 26 can be easily dug up to the outer edge 24E of the support member 24 as shown in FIG. 2a, but an unnecessary work of closing the opening 30 occurs.

  Therefore, as shown in FIG. 8a, the groove 26 is provided in the support member 24 so as to have the opening 30 only at one end, thereby preventing leakage of liquid to the outside and reducing the work of closing unnecessary openings. Alternatively, as shown in FIG. 8b, the groove 26 may be provided in a spiral shape. In this way, the number of openings 30 to the support member 24 can be made one, and detection can be performed on a wide range of the bottom portion 21.

  Further, as shown in FIG. 8 c, the groove 26 may be inclined so as to become lower toward the opening 30. The opening 30 opened to the outer edge 24E of the support member 24 is used for introducing the detection device 13 shown in FIG.

  In the detection device 13 shown in FIG. 1, as shown in FIG. 4 a, a pair of probes 34 installed in a groove 26 as a detection space is connected to a power source, and liquid such as contaminated water is between the probes 34. Thus, there is a means for detecting the liquid in the groove 26 by utilizing the energization. Further, the detection device 13 may detect the water pressure by converting the water pressure into a current using a pressure-sensitive element for the probe 34. When the probe 34 is used, the opening 30 is sealed with a sealing material 35, for example. By doing in this way, the outflow of the liquid outside a management area can be suppressed.

  Moreover, the float type detection device shown in FIGS. 4b and 4c may be used. In this detection device, a float 32 (float) having a specific gravity smaller than that of a liquid such as contaminated water may be installed in a pipe 31 connected to the groove 26 serving as a detection space. This detecting device can detect that the liquid has leaked into the groove 26 by visually recognizing this because the floating 32 rises when contaminated water in the groove 26 which is a detection space flows into the pipe 31. it can.

  In the case where the detection device 13 is a float type, FIG. By providing the float 32, the liquid holder 11 is folded back at a position farther from the ground than the upper end. For this reason, the outflow of the liquid outside a management area can be suppressed. As shown in FIG. 4 c, the upper end of the pipe 33 is returned to the upper part of the liquid holding body 11, so that the liquid can be prevented from flowing out of the management area.

  The signal output when the detection device 13 shown in FIG. 4a detects the liquid leaking from the liquid holding body 11 into the groove 26 is sent to a remote place of the central operation room 36 as shown in FIG. 4d, for example. Observed. Alternatively, for example, as shown in FIG. 4e, a warning lamp 37 provided on the liquid holding body 11 blinks in response to a signal output when the detection device 13 detects the liquid. An indication that the liquid has leaked into the groove 26 may be displayed.

  As shown in FIG. 5a, the detection space (fluid passage) is provided with a partition plate 41 as a partition member on the side opposite to the portion facing the ceiling 23 of the bottom portion 21, and further, the outer peripheral portion is provided. It may be formed by surrounding with the surrounding member 42. The enclosing member 42 is at least as large as the bottom 21 of the liquid holding body 11. Specifically, the outer diameter of the surrounding member 42 is larger than the outer diameter of the bottom 21 of the liquid holding body 11.

  The support member 24, the surrounding member 42, and the bottom portion 21 of the liquid holding body 11 may be stepped. Moreover, as shown in FIG. 5 b, a partition part 43 that is formed by cutting a cylinder obliquely may be provided, and the outer peripheral portion may be surrounded by a surrounding member 42.

  These examples may have a shape in which the side portions 22 are doubled. By doing in this way, the leakage of the liquid from the side surface of the liquid holding body can be captured without taking it out of the management area.

  Next, each process of the manufacturing method of the liquid storage tank which concerns on this embodiment is demonstrated using FIG.6 and FIG.7a to FIG.7f. The liquid storage tank manufacturing method according to the present embodiment provides a liquid storage tank 10 as shown in FIG. 1 by providing a detection space at the bottom of an existing liquid storage tank placed directly on a concrete mount. It is a method of manufacturing.

  In step S001, the liquid storage tank 51 is lifted by the lifting means 52 as shown in FIGS. 7a and 7b. The lifting means 52 is, for example, a crawler crane, but is not limited to this.

  Step S002 is a process of placing the support member 24 on the concrete mount 53 under the suspended liquid storage tank 51. As shown in FIGS. 7 b and 7 c, the support member 24 is installed from the side under the liquid storage tank 51 lifted by the lifting means 52 using the transport means 56. The use of the support member 24 having the groove 26 improves the workability. A partition plate 41 or a partition part 43 as shown in FIG. 5a or 5b may be used. For example, a forklift or the like is used as the transport means 56, but is not limited thereto.

  Step S <b> 003 is a step of lowering the suspended liquid storage tank 51 onto the support member 24. As shown in FIG. 6 d, the liquid storage tank 51 is lowered onto the support member 24 using the lifting means 52. When the liquid storage tank 51 is lowered, the lifting means 52 may be used for the rough position, and the operator 54 may use the tag line 55 for fine adjustment of the position.

  Step S004 is a step of welding the outer peripheral portions of the support member 24 and the bottom portion 21 and installing the detection device 13 shown in FIG. As shown in FIG. 7 e, the outer peripheral portions of the support member 24 and the bottom portion 21 are welded, unnecessary openings 30 are closed by welding, and the detection device 13 is installed in the remaining openings 30. Further, as shown in FIG. 4a, the opening 30 is filled with a sealing material 35 so as to process the outflow of water outside the management area.

  Step S005 is a step of removing the lifting means 52 from the liquid storage tank 51. As shown in FIG. 7f, the lifting means 52 is removed from the liquid storage tank 51 where the welding operation and the installation of the detection device 13 have been completed. The order of steps S004 and S005 may be reversed.

  As described above, the present invention is not limited by the contents described in the present embodiment. The constituent elements of the present embodiment include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in an equivalent range. Furthermore, the components described in this embodiment can be combined as appropriate. In addition, various omissions, substitutions, or changes of components can be made without departing from the scope of the present embodiment.

DESCRIPTION OF SYMBOLS 10 Liquid storage tank 11 Liquid holding body 13 Detection apparatus 21 Bottom part 22 Side part 23 Ceiling 24 Support member 26 Groove 28 Liquid storage space 29 Welding line 30 Opening 31, 33 Pipe 34 Probe 35 Sealing material 51 Liquid storage tank 53 Concrete mount

Claims (7)

A liquid having a bottom, a side coupled to the bottom, and a ceiling facing the bottom and coupled to the side, and holding the liquid in a space surrounded by the bottom, the side, and the ceiling Holding body,
A support member attached to the opposite side of the bottom portion facing the ceiling;
A detection space provided between the bottom and the support member;
Including a liquid storage tank.   The liquid storage tank according to claim 1, wherein the liquid holding body is manufactured by welding steel materials.   The liquid storage according to claim 1, wherein the detection space is a passage provided in at least one of a portion of the support member that faces the bottom and a portion of the bottom that faces the support member. tank. The bottom is manufactured by welding a plurality of members,
The liquid storage tank according to claim 3, wherein the passage is provided at a position corresponding to the weld line of the bottom portion of the support member. The detection space is
One or more partition members are provided between the bottom portion and the support member, and the space between the bottom portion and the support member is surrounded by a surrounding member,
The liquid storage tank according to claim 1, wherein the surrounding member has a size at least equal to or larger than the bottom. The detection device is:
A tube extending from a part of the detection space to a position farther from the ground than the upper end of the liquid holder;
6. The liquid storage tank according to claim 1, wherein the liquid storage tank includes a float that is provided so as to be movable in the pipe and has a specific gravity smaller than that of the liquid. Lift an existing liquid storage tank,
Under the existing liquid storage tank, a plate-shaped member having one or more grooves or liquid flow paths is installed on the surface facing the existing liquid storage tank,
A method for manufacturing a liquid storage tank, wherein the plate-shaped member and the existing liquid storage tank are coupled.

Images