JP2017032098A - Double pipe structure coping with liquid spill and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double pipe structure coping with liquid spill and its construction method that combine a prevention function of breakage due to the heat shrinkage and a liquid leakage confirmation function.SOLUTION: Provided is a structure 2 coping with liquid spill provided on the midway of a double pipe 1 in which an outer pipe 11 is disposed outside an inner pipe 10. The structure comprises the steps of: connecting the outer pipe 11 of the double pipe 1 to both lateral faces of a container body 20 via a flexible pipe 25; inserting the inner pipe 10 of the double pipe 1 into the container body 20 through the interior of an outer flexible pipe 11; connecting the inner pipe 10 of the double pipe 1 via an inner flexible pipe 31 to the interior of the container body 20; and providing a liquid reservoir part 35 configured to visually observe the liquid inside on the bottom face of the container body 20 or on the bottom edge of the side contacting the bottom face.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid leakage countermeasure structure provided in a double pipe in which an outer pipe is disposed outside an inner pipe, and a construction method thereof.

  For example, in chemical factories and pharmaceutical factories, pipes are used to safely transport harmful liquids such as harmful liquids, raw material liquids, waste liquids, radioactively contaminated water, etc. Double pipe is used. Such a double pipe has a double structure in which an outer pipe (protective pipe) is arranged with a predetermined gap provided by a spacer outside the inner pipe (actual pipe). Outflow to the outside can be prevented by the outer tube. Further, the inner tube can be protected from an external impact by the outer tube. For example, a steel pipe or the like is used as the outer pipe of the double pipe, and a resin pipe such as polyvinyl chloride is used as the inner pipe.

  By the way, the inner tube and the outer tube of the double tube expand and contract due to the influence of heat such as fluctuations in the outside air temperature depending on the season. Therefore, due to the difference in coefficient of thermal expansion between the inner tube and the outer tube, if no measures are taken, thermal stress is generated between the outer tube and the inner tube due to expansion and contraction, and the piping may be damaged due to collision within the tube. If the coefficients of thermal expansion of the materials used for the inner and outer tubes of the double tube are greatly different, the difference in expansion and contraction also increases, and it is considered that liquid leakage occurs due to breakage.

  Here, in Patent Document 1, as a countermeasure when a crack occurs in the inner pipe of the double pipe, a groove is formed between the inner pipe and the outer pipe, and water level is detected by guiding water leakage from the groove to the liquid reservoir. Means are shown. Patent Document 2 discloses a means for receiving water in a transparent case when the joint is covered with a water-stopping material, a transparent case is provided outside the joint, and the absorption capacity of the water-stopping material is exceeded. It is shown. Further, Patent Document 3 discloses a means for absorbing expansion and contraction generated in a double pipe due to a temperature difference by sliding of the outer pipe.

JP-A-7-217788 JP-A-8-296789 Japanese Patent Publication No. 2-14591

  However, although invention of patent document 1 detects a water leak, it does not consider about the thermal expansion-contraction difference of an inner tube and an outer tube. Moreover, the invention of Patent Document 2 can only cope with water leakage in the joint portion surrounded by the expansion material. Furthermore, the invention of Patent Document 3 does not consider liquid leakage. In the inventions of Patent Document 2 and Patent Document 3, it is impossible to confirm liquid leakage. Thus, there has been no mechanism that has a function of preventing damage due to heat shrinkage of the double pipe and a function of preventing liquid leakage.

  This invention is made | formed in view of this point, and it aims at providing the liquid leak corresponding | compatible structure of the double tube | pipe which had the damage prevention function and heat leak confirmation function by heat shrink, and its construction method.

  In order to achieve the above object, according to the present invention, there is provided a structure for liquid leakage provided in the middle of a double pipe in which an outer pipe is arranged outside an inner pipe, and outer flexible pipes are provided on both sides of a container body. The outer pipe of the double pipe is connected to the inner pipe of the double pipe through the inner flexible pipe, and the inner pipe of the double pipe is inserted into the container main body through the inner flexible pipe. A double-pipe liquid leak proof structure, characterized in that a liquid reservoir is provided at the bottom of the bottom face of the container body or in contact with the bottom face of the container body so that the liquid inside is visible. Provided.

  Further, according to the present invention, there is provided a method for constructing a liquid leakage countermeasure structure in the middle of a double pipe in which an outer pipe is arranged outside the inner pipe, wherein the outer flexible pipe is connected to the outer pipe of the double pipe, Connect the outer flexible pipe connected to the pipe to one side of the container body, insert the inner pipe of the double pipe into the container body through the outer flexible pipe, and place the outer flexible pipe on the other side of the container body. Connect the outer pipe of the double pipe to the outer flexible pipe connected to the other side of the container body, and insert the inner pipe of the double pipe into the container body through the inside of the outer flexible pipe. In the main body, a method for constructing a double-pipe liquid leak proof structure characterized in that an inner tube inserted from one side and an inner tube inserted from the other side are connected via an inner flexible tube. Is provided.

  According to the present invention, when the inner pipe and the outer pipe of the double pipe expand and contract due to the influence of heat, the outer flexible pipe connecting the outer pipe of the double pipe and the side surface of the container body and the inner pipe of the double pipe When the inner flexible pipes connecting the comrades are appropriately bent, thermal stress can be absorbed and damage due to thermal contraction can be prevented. Further, when a liquid leak occurs from the inner tube, the leaked liquid is received by the container main body and flows into the liquid reservoir provided at the bottom surface of the container main body or at the bottom of the side surface in contact with the bottom surface. In this way, it is visually confirmed that the liquid has flowed into the liquid reservoir, and the occurrence of liquid leakage can be confirmed.

  In the present invention, since the expansion and contraction is absorbed by the outer flexible tube and the inner flexible tube, the portion where the thermal stress is applied is specified around the liquid leakage countermeasure structure, and the maintenance range of care can be limited. The connection between the inner pipe and the inner flexible pipe of the double pipe can be performed by using a joint such as a flange or a valve that cannot be used with the conventional double pipe due to the specificity of the shape. The inner space of the outer pipe is limited, and it is impossible to connect the inner pipes with a flexible pipe inside the outer pipe. According to the present invention, since the inner pipes are connected by the inner flexible pipe in the container main body, such a problem is also eliminated. In addition, the use of the outer flexible pipe and the inner flexible pipe for the connection facilitates the coupling of the double pipes, and even in the work of replacing existing pipes, the double pipes that are originally required to be laid in one piece are partially Can be refilled.

It is a top view of the liquid leak corresponding structure of the double tube concerning this Embodiment. It is XX sectional drawing in FIG. It is explanatory drawing of the construction method of the liquid leak corresponding | compatible structure concerning this Embodiment, and shows the state which made the inner pipe | tube project from the outer pipe | tube of a double pipe. It is explanatory drawing of the construction method of the structure corresponding to the liquid leakage concerning this Embodiment, the state which connected the outer flexible pipe to the outer pipe of a double pipe, and let the inner pipe of the double pipe pass inside the outer flexible pipe Show. It is explanatory drawing of the construction method of the liquid leakage response structure concerning this Embodiment in the same cross-sectional position as FIG. 2, and one side surface of the container with a lid is connected to an outer flexible pipe, and it is two in the container with a lid. The state which inserted the inner pipe of the heavy pipe is shown. It is explanatory drawing of the construction method of the liquid leakage corresponding | compatible structure concerning this Embodiment in the same cross-sectional position as FIG. 2, and shows the state which connected the outer flexible pipe | tube to the other side surface of the container with a lid | cover. It is explanatory drawing of the construction method of the liquid leakage response structure concerning this Embodiment in the same cross-sectional position as FIG. 2, the outer pipe of a double pipe is connected to an outer flexible pipe, and the inside of a double pipe is connected to an outer flexible pipe The state which inserted the pipe | tube and extended the double pipe | tube extendedly on the other side of the container with a lid | cover is shown. It is explanatory drawing of the form which provided the liquid leak corresponding structure separately in the middle of the double pipe provided in multiple numbers.

  Embodiments of the present invention will be described below. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 1 and 2, for example, in a chemical factory or a chemical factory, a double pipe 1 is used as a pipe for safely transporting harmful liquids, raw material liquids, waste liquids, harmful liquids, etc. in FIGS. The liquid leakage countermeasure structure 2 according to the embodiment of the present invention is provided in the middle thereof.

  The double pipe 1 has a double structure in which an outer pipe 11 is arranged outside the inner pipe 10, and is used as appropriate in consideration of environmental protection, safety measures, etc., for example, in a chemical factory or a chemical factory. For example, SGP (carbon steel pipe for piping) is used for the outer pipe 11, and a resin pipe such as polyvinyl chloride is used for the inner pipe 10.

  The liquid leakage response structure 2 includes a rectangular container body 20. The upper surface of the container body 20 is closed by the lid 21, and the interior of the container body 20 is in a sealed state. The container body 20 and the lid 21 are made of, for example, stainless steel. The lid 21 is detachably attached to a bracket 23 formed on the upper surface of the container body 20 by a locking member 22 such as a thumbscrew. For this reason, by loosening the locking member 22, the container body 20 can be easily opened by being detached from the lid 21 from the upper surface of the container body 20. In FIG. 1, in order to show the internal structure of the container body 20 as viewed from above, a state where the container body 20 is removed from the lid 21 from the upper surface of the container body 20 is shown. Further, FIG. 2 shows a state in which the internal structure of the container body 20 is viewed from the side in the XX cross section.

  The left and right side surfaces of the container body 20 in FIGS. 1 and 2 are connected to the outer tube 11 of the double tube 1 via outer flexible tubes 25 and 25, respectively. The outer flexible tube 25 is made of, for example, stainless steel. In this embodiment, hollow cylindrical sleeves 26, 26 communicating with the inside of the container body 20 are provided on the left and right side surfaces of the container body 20, and the outer flexible tubes 25, 25 are connected to the sleeves 26, 26, respectively. ing. The connection between the sleeve 26 and the outer flexible tube 25 is made by a flange joint portion 27. Similarly, both the outer tube 11 and the outer flexible tube 25 of the double tube 1 are connected by the flange joint portion 28. As described above, the outer tube 11 of the double tube 1 is connected to the side surface of the container body 20 via the sleeve 26, so that the internal space of the outer tube 11 of the double tube 1 communicates with the inside of the container body 20. ing.

  The inner tube 10 of the double tube 1 is inserted into the container body 20 through the inside of the outer flexible tube 25 and the sleeve 26. That is, the inner tube 10 and the outer tube 11 of the double tube 1 are both interrupted at the portion where the liquid leakage response structure 2 is disposed, but the inner tube 10 includes the outer flexible tube 25 and the sleeve. 26 is projected from the outer tube 11 longer than the total length of 26. For this reason, when the outer tube 11 is connected to the left and right side surfaces of the container body 20 via the outer flexible tubes 25, 25, the inner tube 10 is inserted into the container body 20. Thus, the inner tube 10 inserted into the container body 20 is supported by the plate 30 disposed on the bottom surface of the container body 20, and the inner tube 10 is disposed at substantially the center inside the container body 20. ing.

  Thus, the inner pipes 10 of the double pipe 1 inserted into the inside from the left and right side surfaces of the container body 20 are connected to each other through the inner flexible pipe 31 in the container body 20. The inner flexible tube 31 is made of, for example, a resin tube (hose). Therefore, although the inner pipe 10 of the double pipe 1 is interrupted at the portion where the liquid leakage countermeasure structure 2 is arranged, it is connected in series via the inner flexible pipe 31 and is kept in communication. Similarly, the connection between the inner tube 10 and the inner flexible tube 31 of the double tube 1 is made by the flange joint portion 32.

  On the bottom surface of the container body 20, a liquid reservoir portion 35 configured to be visible inside is provided. The liquid reservoir 35 has a configuration in which an open / close cock 37 is attached to a tube 36 such as a transparent PVC pipe that can be visually observed. For this reason, when a liquid enters the container body 20, the liquid flows into the tube 36 from the bottom surface of the container body 20, and the liquid can be visually observed from the outside. The liquid accumulated in the tube 36 can be dropped and discharged from the tube 36 by opening the opening / closing cock 37.

  Next, an example of a method for constructing the liquid leakage response structure 2 in the middle of the double pipe 1 will be described with reference to FIGS. In the following embodiment, the liquid leakage countermeasure structure 2 is constructed in the middle of the double pipe 1 constructed from the left side in the figure, and the double pipe 1 is extended and constructed on the right side in the figure. The case of going will be described.

  First, as shown in FIG. 3, the inner tube 10 is projected from the outer tube 11 of the double tube 1 at the tip of the double tube 1 constructed from the left side in the drawing. In this case, the protruding length of the inner tube 10 is set to be longer than the total length of the outer flexible tube 25 and the sleeve 26 to be applied later. In addition, in the front-end | tip of the double pipe 1 constructed | assembled from the left side in a figure, the inner pipe | tube 10 can also be inserted in the outer pipe | tube 11 of the double pipe 1. FIG.

  Next, as shown in FIG. 4, the outer flexible tube 25 is connected to the outer tube 11 of the double tube 1. The connection between the outer tube 11 and the outer flexible tube 25 can be easily performed by the flange joint portion 28. Further, when connecting the outer flexible tube 25 to the outer tube 11 in this way, the inner tube 10 protruding from the outer tube 11 of the double tube 1 is connected to the outer tube 11 by passing through the inside of the outer flexible tube 25. The inner tube 10 can be protruded from the outer flexible tube 25.

  Next, as shown in FIG. 5, the outer flexible tube 25 connected to the outer tube 11 of the double tube 1 is connected to one side surface of the container body 20 via the sleeve 26 (in this embodiment, the left side of the container body 20). Connect the surface). Thereby, the inner space of the outer tube 11 of the double tube 1 constructed from the left side in the figure is in a state of communicating with the inside of the container body 20. Further, by passing the inner tube 10 protruding from the outer tube 11 of the double tube 1 from the inside of the outer flexible tube 25 to the inside of the sleeve 26, the inner tube 10 of the double tube 1 is inserted into the container body 20. The inner tube 10 inserted and inserted into the container main body 20 is supported by a plate 30 disposed on the bottom surface of the container main body 20. The connection between the sleeve 26 and the outer flexible tube 25 can be easily performed by the flange joint portion 27.

  Next, as shown in FIG. 6, the outer flexible tube 25 is connected to a sleeve 26 provided on the other side surface of the container body 20 (in this embodiment, the right side surface of the container body 20). Also in this case, the connection between the sleeve 26 and the outer flexible tube 25 can be easily performed by the flange joint portion 27.

  Next, as shown in FIG. 7, the outer tube 11 of the double tube 1 to be constructed on the right side in the drawing is connected to the outer flexible tube 25 attached to the other side surface of the container body 20. Thereby, the internal space of the outer pipe 11 of the double pipe 1 to be constructed on the right side in the drawing is also in a state of communicating with the inside of the container body 20. Also in this case, the connection between the outer tube 11 and the outer flexible tube 25 can be easily performed by the flange joint portion 28.

  Further, the inner pipe 10 of the double pipe 1 to be constructed on the right side in the figure is inserted into the container body 20 through the inside of the outer flexible pipe 25 and the sleeve 26 attached to the other side surface of the container body 20, The inner tube 10 inserted into the container body 20 is supported by the plate 30 disposed on the bottom surface of the container body 20. In this way, the inner pipe 10 of the double pipe 1 constructed from the left side in the figure and the inner pipe 10 of the double pipe 1 constructed from the right side in the figure in the container body 20 are set in a predetermined manner. Make a gap and face each other. In this case, the inner pipe 10 of the double pipe 1 to be constructed can be inserted from the container body 20 into the outer pipe 11 previously constructed.

  In the container body 20, the inner pipes 10 facing each other with a predetermined gap are connected to each other through the inner flexible pipe 31. Thereafter, the upper surface of the container body 20 is closed with a lid 21 and the inside of the container body 20 is sealed, so that the liquid leakage response structure 2 according to the embodiment of the present invention described above with reference to FIGS. It is constructed in the middle of 1.

  When the inner tube 10 and the outer tube 11 of the double tube 1 expand and contract due to the influence of heat in the liquid leak response structure 2 thus constructed, the outer tube 11 of the double tube 1 and the side surface of the container body 20 are connected. The inner flexible tube 31 connecting the outer flexible tube 25 and the inner tube 10 of the double tube 1 is appropriately bent, so that thermal stress can be absorbed and damage due to heat shrinkage can be prevented. Further, when liquid leakage occurs from the inner tube 10, the liquid that has leaked is received by the outer tube 11, then flows into the container body 20, and further enters the liquid reservoir 35 provided on the bottom surface of the container body 20. Will flow. The tube 36 of the liquid reservoir 35 is made of a transparent PVC pipe or the like, and the inside can be visually observed. Thus, it can be visually confirmed that the liquid has flowed into the liquid reservoir 35, and the occurrence of liquid leakage can be confirmed.

  It should be noted that where the liquid leakage response structure 2 is arranged in the double pipe 1 is basically determined by the amount of thermal expansion and contraction. It is preferable to provide the liquid leakage countermeasure structure 2 at a place where the piping level is lowered, and to collect the liquid in the container body 20 by gravity when the liquid leaks. For example, the liquid leakage response structure 2 is arranged at a height of 1,200 mm from the floor, and the liquid reservoir 35 (tube 36) is screwed directly into the opening provided on the bottom surface of the container body 20 through the socket. Join. When the open / close cock 37 is opened to drain the liquid from the liquid reservoir 35, the liquid dropped and discharged from the tube 36 is received by a bucket or the like. In addition, when the installation position of the liquid leakage countermeasure structure 2 is low, a liquid reservoir portion 35 may be provided via an elbow at the lower end of the side surface in contact with the bottom surface of the container body 20. Further, the pipe may be extended from the liquid reservoir 35 to a separately provided liquid tank. Moreover, an opening, a drain pipe, a valve, etc. can be provided also in the outer tube 11 as needed.

  In the present invention, since expansion and contraction is absorbed by the outer flexible tube 25 and the inner flexible tube 31, a portion to which thermal stress is applied can be specified as the position of the liquid leakage response structure 2, and a maintenance caution range can be limited. The connection between the inner tube 10 and the inner flexible tube 31 of the double tube 1 can be easily performed in the container body 20 by using a joint such as a flange, a valve, or the like that could not be used conventionally. Further, since the outer flexible tube 25 and the inner flexible tube 31 are used for connection, the double tube 1 can be easily joined.

  As shown in FIG. 8, when a plurality of double pipes 1 are provided side by side, the liquid leakage countermeasure structure 2 is provided separately in the middle of each double pipe 1. Thus, by providing the corresponding structure 2 in each double pipe 1 individually, mixing of the liquid conveyed by each double pipe 1 is prevented.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, the container body 20 may have various shapes such as a cylindrical shape in addition to a rectangular shape. Further, the locking member 22 for detaching the lid 21 of the container body 20 may be a patchon lock or the like in addition to the thumbscrew. Moreover, although the form which provided the sleeves 26 and 26 in the left and right side surface of the container main body 20 was shown, you may connect the outer flexible pipes 25 and 25 directly to the right and left side surface of the container main body 20. FIG. Alternatively, the double pipe 1 may be laid from both directions toward the installation planned site of the liquid leak response structure 2, and finally the double pipe 1 may be connected to both sides of the liquid leak response structure 2.

DESCRIPTION OF SYMBOLS 1 Double pipe 2 Liquid leak corresponding structure 10 Inner pipe 11 Outer pipe 20 Container body 21 Lid 22 Locking member 23 Bracket 25 Outer flexible pipe 26 Sleeve 27, 28, 32 Flange joint part 32 Flange joint part 30 Plate 31 Inner flexible pipe 35 Liquid reservoir 36 Tube 37 Opening / closing cock

Claims (2)

It is a structure for liquid leakage provided in the middle of a double pipe with an outer pipe arranged outside the inner pipe,
A double pipe outer pipe is connected to both sides of the container body via an outer flexible pipe,
The inner pipe of the double pipe is inserted into the container body through the inside of the outer flexible pipe,
In the container body, the inner pipe of the double pipe is connected via the inner flexible pipe,
A double-pipe liquid leak proof structure, characterized in that a bottom of the container body or a lower end of the side surface in contact with the bottom is provided with a liquid reservoir configured to allow the internal liquid to be visually observed. It is a method of constructing a liquid leak response structure in the middle of a double pipe with an outer pipe arranged outside the inner pipe,
Connect the outer flexible pipe to the outer pipe of the double pipe,
Connect the outer flexible tube connected to the outer tube to one side of the container body, insert the inner tube of the double tube into the container body through the inside of the outer flexible tube,
Connect the outer flexible tube to the other side of the container body,
Connect the outer pipe of the double pipe to the outer flexible pipe connected to the other side of the container body, and insert the inner pipe of the double pipe into the container body through the inside of the outer flexible pipe.
In the container main body, construction of a double pipe liquid leak proof structure characterized in that the inner pipe inserted from one side face and the inner pipe inserted from the other side face are connected via an inner flexible pipe. Method.

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