JP6415024B2 - Piping structure and inspection method of piping structure - Google Patents

Description

  The present invention relates to a piping structure and a piping structure inspection method.

  In general, a large number of water supply and drainage pipes and air conditioning pipes are installed inside buildings such as apartments, apartments, detached houses, buildings, and factories. For example, a colored polyvinyl chloride pipe is used as a pipe constituting such a water supply / drain pipe or an air conditioning pipe. When a fluid such as water or air is branched into a plurality of paths or continuously passed through two or more pipes, a joint provided with a plurality of receiving ports is used to match the arrangement of the pipes. A plurality of pipes are connected by inserting and fixing the pipes to the respective receiving ports.

  As described above, an adhesive is used to fix the pipe to the joint opening. However, many adhesives are transparent, and piping work is often performed in dark places inside buildings such as pipe spaces and ceiling spaces, making it difficult to determine whether or not adhesive is applied to the pipes. There is a possibility that the connection between the pipe and the joint becomes insufficient when the pipe is inserted into the receiving port without the adhesive. As an adhesive for preventing such forgetting to apply the adhesive in the pipe and preventing poor connection between the pipe and the joint, Patent Document 1 discloses an adhesive containing a fluorescent colorant.

  FIG. 5 is a side view showing a state in which the pipe is connected to the joint using the adhesive disclosed in Patent Document 1, and FIG. 6 is a side view showing the piping structure 100. When the pipe 102 and the joint 101 are connected using the adhesive 104 containing the colorant, the adhesive 104 is applied to the end 102E of the pipe 102 as shown in FIG. At this time, the length of the adhesive 104 is made longer than the length for inserting the tube 102 into the receiving port 106 of the joint 101. Subsequently, the pipe 102 is moved in the direction of the arrow and inserted into the receiving port 106 to obtain a piping structure 100 shown in FIG. In the piping structure 100, it is recognized that the adhesive 104 is applied to the pipe 102 by visually observing a part of the adhesive 104 exposed from the joint 101 or the fluorescence emitted from the part.

JP-A-60-72971

  However, even when the pipe is fixed to the joint receiving port using a conventional adhesive, there is a problem that the insertion state of the pipe cannot be confirmed because the joint is opaque. In addition, if the length of the adhesive required to fix the tube to the receiving port is shorter than the length to insert the tube into the receiving port, the adhesive necessary to fix the tube to the receiving port is applied to the tube. The adhesive is not exposed from the joint even though the pipe is fixed to the receptacle and the pipe is normally connected to the joint. Therefore, there has been a problem that erroneous recognition that the adhesive is not applied to the pipe or that the pipe is not connected to the joint occurs.

  The present invention has been made in view of the above circumstances, and it is possible to check the insertion state of the pipe inside the joint even at night or in the dark after the pipe construction, and the pipe is fixed to the joint receiving port. It is an object of the present invention to provide a piping structure and an inspection method for the piping structure that make it possible to easily and surely see what is being done.

The piping structure of the present invention is a piping structure installed in a pipe space or a ceiling space inside a building, and is a transparent or translucent joint provided with a receiving port, a pipe inserted into the receiving port, An adhesive comprising a light emitting substance that emits fluorescence when irradiated with ultraviolet light while fixing the tube to the receptacle interposed between the receptacle and the tube (however, a colorant, a light-reflecting inorganic substance) and excluding adhesive) containing, have the wavelength of fluorescence Ri der than 550nm or less 500 nm, the adhesive further comprises a colorless transparent resin, an organic solvent to visible light, the luminescent material wherein the soluble organic compound der Rukoto to the organic solvent.
In the piping structure of the present invention, it is preferable that the adhesive contains 0.001% by weight or more and 1.0% by weight or less of the luminescent material.

The pipe structure inspection method of the present invention is a pipe structure inspection method installed in a pipe space or a ceiling space inside a building , and is inserted into the joint that is transparent or translucent provided with a receiving port. is a tube was, together with the tube interposed between said receiver pipe is fixed to the receptacle, the adhesive containing a light-emitting substance that emits fluorescence by irradiating ultraviolet light (however, colorants and excluding adhesive comprising a light reflecting inorganic material), have a, the adhesive further comprises a colorless transparent resin, a solvent to visible light, the luminescent material soluble organic compound in the organic solvent the ultraviolet light irradiating the receptacle der Ru piping organic structure, characterized by the following 550nm wavelength 500nm or more of the fluorescence.

  According to the present invention, there is provided a piping structure and an inspection method for the piping structure that can confirm the insertion state of the pipe inside the joint and that the pipe is fixed to the joint opening easily and surely. Provided.

It is a side view which shows the piping structure which is embodiment of this invention, and is a figure in case the adhesive agent is apply | coated longer than the length in which a pipe | tube is inserted in a coupling in the longitudinal direction of a pipe | tube. It is a side view which shows the piping structure which is embodiment of this invention, and is a figure in case the adhesive agent is apply | coated less than the length by which a pipe | tube is inserted in a coupling in the longitudinal direction of a pipe | tube. It is a side view which shows a mode that a pipe | tube is connected to a coupling in order to obtain the piping structure which is embodiment of this invention. It is a side view for demonstrating the inspection method of the piping structure which is embodiment of this invention. It is a side view which shows a mode that a pipe | tube is connected to a coupling using the conventional adhesive agent. It is a side view which shows the conventional piping structure.

  Hereinafter, a piping structure and a piping structure inspection method (hereinafter simply referred to as a piping structure of the present embodiment and a piping structure inspection method of the present embodiment) according to an embodiment to which the present invention is applied will be described with reference to the drawings. To do. The drawings used in the following description are schematic, and the length, width, thickness ratio, and the like are not necessarily the same as the actual ones, and can be changed as appropriate.

  As shown in FIG. 1, the piping structure 50 includes a joint 51, a pipe 52, and an adhesive 54.

  The joint 51 is a tubular member made of a transparent or translucent material. Here, being transparent or translucent means that absorption and scattering of ultraviolet light and visible light do not occur, or absorption and scattering of ultraviolet light and visible light are relatively small. Receiving ports 56 are provided at both ends of the joint 51. Inside the joint 51 between the two receiving ports 56, a stopper 58 for locking the end 52E of the tube 52 inserted into each receiving port 56 in the longitudinal direction of the tube 52 is provided. As a material of the joint 51, for example, polyvinyl chloride excellent in transparency can be cited, and hard polyvinyl chloride is preferable in that it is inexpensive and lightweight.

  The pipe 52 is a tubular member that is inserted into the receiving port 56 of the joint 51 and is made of a material that is resistant to the fluid flowing through the hollow portion. Examples of the material of the pipe 52 include thermoplastic resins applicable to extrusion molding, and polyvinyl chloride and polyethylene are preferable because the pipe 52 can be easily and inexpensively formed by extrusion molding. When transparent polyvinyl chloride is used as the material of the joint 51, the pipe 52 is a polyvinyl chloride pipe whose outer peripheral surface is colored.

The adhesive 54 is interposed between at least the receiving port 56 of the joint 51 and the tube 52, and fixes the end portion 52 </ b> E of the tube 52 to the receiving port 56. The length _{L 54} of the adhesive 54 is a length capable of fixing the pipe 52 to the receptacle 56, longer than the length _{L 56} of Figure 1, receptacle 56. However, as shown in FIG. 1, the length is not necessarily longer than the length L ₅₆ of the receiving port 56, the adhesiveness and adhesive strength of the adhesive 54 are high, and the end 52 E of the tube 52 is firmly fixed to the receiving port 56. If it is may be less the length L ₅₆ of the socket 56 as shown in FIG.

The adhesive 54 is made of a material such as a resin, a solvent, or a stabilizer, and includes a light emitting substance that emits fluorescence when irradiated with ultraviolet light. Therefore, the adhesive 54 emits fluorescence when it is irradiated with ultraviolet rays by black light or the like. The wavelength of the fluorescence is in the visible wavelength range. Examples of such a luminescent substance include organic compounds such as coumarin-based, stilbene-based, and rhodamine-based materials that are soluble in organic solvents. The excitation wavelength λ ₁ and the fluorescence wavelength λ ₂ are typical absorption and fluorescence peak wavelengths in each luminescent material, and may be changed by several nanometers.

The fluorescence wavelength is preferably 500 nm or more and 550 nm or less. If the wavelength of the fluorescence is within the above range, human visibility is high, and it is easy to distinguish it from blue light having an excitation wavelength λ ₁ emitted from an ultraviolet light source such as black light. Is increased. Examples of such a light-emitting substance include 3-[(quinolin-2-yl) methylidene] isoindoline-1-one (chemical formula: C ₁₈ H ₁₂ N ₂ O).

  The content of the luminescent substance in the adhesive 54 is such that when the adhesive 54 is irradiated with ultraviolet light from a general ultraviolet light source such as a black light, the luminescent substance emits fluorescence that can be sufficiently visually recognized by the operator. Has been. Specifically, the content of the luminescent substance in the adhesive 54 is preferably 0.001 wt% or more and 1.0 wt% or less, and preferably 0.02 wt% or more and 0.2 wt% or less. More preferably, it is more preferably 0.1% by weight or more and 0.2% by weight or less. If the content of the luminescent substance in the adhesive 54 is equal to or higher than the lower limit value, it is preferable because fluorescent light having a sufficient intensity that can be viewed instantaneously from the luminescent substance is emitted. If the content of the luminescent material in the adhesive 54 exceeds the upper limit, the light receiving sensitivity of the fluorescence from the luminescent material will reach its peak, which is not preferable because the use amount of the luminescent material is only increased unnecessarily and the cost is increased.

Next, a method for obtaining the piping structure 50 of the present embodiment will be described.
First, as shown in FIG. 3, an adhesive 54 is applied to the outer peripheral surface of the end 52E of the tube 52 with a predetermined length. Thereafter, the pipe 52 is moved in the direction of the arrow shown in FIG. 3, and the pipe 52 is inserted into one receiving port 56 of the joint 51 from the end 52 </ b> E. The tube 52 is pushed into the receiving port 56 until the end 52E is locked to the stopper 58 of the joint 51. In a similar operation, another pipe 52 coated with the adhesive 54 is inserted from the end 52E into the other receiving port 56 of the joint 51, and the end 52E is locked by the stopper 58. Through the above steps, the piping structure 50 shown in FIG. 1 is obtained.

Next, a method for inspecting the piping structure of the present embodiment will be described.
First, an ultraviolet light source 60 such as a black light is prepared. As shown in FIG. 4, ultraviolet light in a wavelength region including the excitation wavelength λ ₁ of the luminescent material is emitted from the ultraviolet light source 60 and irradiated to the piping structure 50. In order to confirm the insertion state of the pipe 52 inside the joint 51, at least the receiving port 56 of the joint 51 is irradiated with ultraviolet light.

The irradiated ultraviolet light having the excitation wavelength λ ₁ passes through the transparent or translucent joint 51 and is absorbed by the luminescent material contained in the adhesive 54. Since the electrons in the luminescent material are excited by the absorbed ultraviolet light, fluorescence having a wavelength λ ₂ as a peak is emitted from the luminescent material. The fluorescence passes through the joint 51 and is emitted toward the outside of the joint 51. At this time, since some ultraviolet rays are absorbed by the joint 51, the fluorescence of the adhesive 54 interposed between the receiving port 56 and the pipe 52 is more than the fluorescence of the adhesive 54 exposed from the joint 51. May be slightly weakened. Further, when the ultraviolet light is irradiated, the receiving port 56 may emit light or emit light having a color different from the fluorescence of the adhesive 54 from which the receiving port 56 is exposed. The operator can add the fluorescence from the adhesive 54 interposed between the receiving port 56 and the tube 52 and the fluorescence from the adhesive 54 exposed from the joint 51 in the longitudinal direction of each tube 52. By visually checking the sheath distribution, the insertion state of the pipe 52 and the application state of the adhesive 54 inside the joint 51 are confirmed.

  Through the above steps, the insertion state of the pipe 52 inside the joint 51 is confirmed, and the piping structure relating to whether or not the adhesive 54 is applied to the pipe 52, whether or not the pipe 52 is fixed to the receiving port 56, etc. 50 tests are performed.

  Here, the piping structure 50 according to the present embodiment includes a transparent or translucent joint 51 having a receiving port 56, a pipe 52 inserted into the receiving port 56, and a space between the receiving port 56 and the pipe 52. Then, the tube 52 is fixed to the receiving port 56, and an adhesive 54 containing a luminescent substance that emits fluorescence when irradiated with ultraviolet light is provided. Thereby, when the piping structure 50 is irradiated with ultraviolet rays, the ultraviolet rays pass through the joint 51 and are absorbed by the light emitting material contained in the adhesive 54. At the same time, fluorescence is emitted from the luminescent material, passes through the joint 51, and is emitted to the outside of the joint 51. Therefore, the presence / absence and distribution of fluorescence can be visually observed, and the length in which the tube 52 is inserted into the receiving port 56, or the adhesive of sufficient length and amount that can be fixed to the end 52E of the tube 52 by the receiving port 56. Whether or not the agent 54 is applied and the application state of the adhesive 54 can be visually recognized almost simultaneously with the irradiation of ultraviolet light. Therefore, even in a dark place, it is possible to easily confirm the insertion state of the pipe 52 inside the joint 51 and whether or not the pipe 52 is fixed to the receiving port 56 of the joint 51.

Further, the length L _{54 of} the applied adhesive ₅₄ is not less than a predetermined length of the adhesive 54 that can fix the pipe 52 to the receiving port 56 and less than the length L _{56 of the} receiving port 56, and Even if 54 is not exposed, the fluorescence from the adhesive 54 becomes visible. Therefore, even when the predetermined length is shorter than the length L ₅₆ of the receiving port 56, it can be reliably confirmed whether or not the pipe 52 is fixed to the receiving port 56 of the joint 51. In this case, the usage amount of the adhesive 54 can be moderately suppressed without wasting the adhesive 54. At the same time, since the adhesive 54 is not exposed from the joint 51, it is possible to prevent the dirt from adhering to the piping structure 50.

Moreover, in the piping structure 50 of this embodiment, if the wavelength of the fluorescence emitted from the luminescent material contained in the adhesive 54 is 500 nm or more and 550 nm or less, the human luminosity is high from the luminescent material, such as black light. Since it becomes easy to distinguish from the blue light of the excitation wavelength λ ₁ emitted from the ultraviolet light source and the fluorescence from the joint 51, the visibility of the fluorescence from the adhesive 54 is enhanced.
Furthermore, in the piping structure 50 of the present embodiment, when the adhesive 54 contains 0.001% by weight or more and 1.0% by weight or less of the luminescent material, the fluorescent light with sufficient intensity that can be instantly recognized from the luminescent material. Is emitted, and the light receiving sensitivity of the fluorescence from the light emitting material does not reach its peak, and the amount of the light emitting material used is moderately suppressed.

  Furthermore, when the adhesive 54 is made of a material such as a resin, a solvent, or a stabilizer that is colorless and transparent with respect to visible light and contains a light emitting substance that emits fluorescence when irradiated with ultraviolet light, Even when the adhesive 54 adheres to the floor or wall surface when the adhesive 54 is applied to 52, the color of the adhesive 54 does not come out under the visible light source after finishing the floor or wall surface, and the construction is facilitated. . In addition, when a pipe is connected to a transparent joint using a colored adhesive as in the prior art, the appearance of the pipe structure is impaired by the color of the adhesive, but in the pipe structure 50 to which the present invention is applied, the color of the adhesive 54 Is inconspicuous, the aesthetics of the piping structure 50 are not impaired, and the ceiling piping is beautifully finished.

  According to the piping structure inspection method of the present embodiment, ultraviolet rays are irradiated to the piping structure 50 so that the ultraviolet rays are transmitted through the joint 51 that is transparent or translucent, and the adhesive 54 is irradiated. Thereby, the luminescent substance contained in the adhesive 54 is excited and emits fluorescence. The fluorescence passes through the joint 51 and is emitted to the outside of the joint 51. That is, fluorescence is generated from the adhesive 54 in a dark place so that it can be seen from the outside of the joint 51. Accordingly, the operator can obtain the length and distribution of the fluorescent tube 52 emitted from the adhesive 54 interposed between the receiving port 56 and the tube 52 in the longitudinal direction, and the adhesive 54 exposed from the joint 51. The length and distribution of fluorescence emitted from can be easily visually confirmed. As a result, it is possible to easily and accurately inspect the insertion state of the pipe 52 inside the joint 51 and whether or not the pipe 52 is fixed to the receiving port 56 of the joint 51.

  Moreover, according to the piping structure inspection method of the present embodiment, if the receiving port 56 of the piping structure 50 is irradiated with ultraviolet light, the fluorescence emitted from the adhesive 54 can be visually recognized as described above. Therefore, the ultraviolet light source used for the inspection of the piping structure can be a relatively small and light ultraviolet light source that emits ultraviolet light of an irradiation area and a light quantity that can irradiate the receiving port 56. Thereby, the work efficiency at the time of piping and an inspection improves.

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. Deformation / change is possible.
For example, as illustrated in FIGS. 1 and 2, the joint 51 is not limited to a linear member as illustrated in FIGS. 1 and 2, and may be curved or bent, or may be branched in many. Specifically, the joint 51 may be an elbow pipe, a cheese pipe, a cross pipe, a cap, or the like.
Moreover, it forms in the taper shape from which the internal diameter becomes large, so that the receiving port 56 of the coupling 51 progresses to an exit side, and the pipe | tubes 52 may be adhesively joined.

  Next, the present invention will be described in detail by the following examples, but the present invention is not limited only to these examples.

Example 1
First, as a pipe, a VP pipe made of vinyl chloride and an AC drain pipe (manufactured by Sekisui Chemical Co., Ltd.) were prepared. As a joint, a transparent pipe joint made of hard polyvinyl chloride (manufactured by Sekisui Chemical Co., Ltd.) (hereinafter simply referred to as a transparent joint) was prepared.

  Next, as an adhesive, the composition is 15 to 25% by weight of a vinyl chloride / vinyl acetate copolymer resin, 25 to 35% by weight of methyl ethyl ketone (solvent), 30 to 40% by weight of cyclohexanone (solvent), and 15 to 25% by weight of acetone (solvent). %, Tin compound (stabilizer) 0.1 to 0.3% by weight of mixed material and fluorescent adhesive (trade name: TINOPAL OB, manufactured by Sekisui Fuller Co., Ltd.) and commercially available adhesive (commodity) Name: Leuhi marker MR-30, R-50, manufactured by Sinloi Co., Ltd.) and a commercially available adhesive containing 3-[(quinolin-2-yl) methylidene] isoindoline-1-one as a fluorescent substance (trade name: Loihi marker R-70, manufactured by Shinroihi Co., Ltd.) was prepared, and each adhesive was applied to the ends of the VP pipe and the AC drain pipe. The content of the fluorescent substance in each adhesive was 1.0% by weight. The length for applying each adhesive was the length exposed from the joint when the tube was inserted until it was locked by the stopper of the transparent joint. Subsequently, a VP pipe and an AC drain pipe to which each adhesive was applied were respectively inserted into a receiving port of a transparent joint to obtain a piping structure.

  Next, using a black light (model number: PW-UV343H-02, manufactured by Contec Co., Ltd.), which is an ultraviolet light source, ultraviolet light was irradiated to the joint receiving port of the piping structure in a dark place. Table 1 shows the results of visual recognition of various adhesives applied to the tube.

  As shown in Table 1, when TINOPAL OB was used as an adhesive and when Leuch marker MR-30 was used, TINOPAL OB exposed from the receiving port of the transparent joint by irradiation with ultraviolet light from black light was blue. The tube was inserted into the joint by visually recognizing the blue fluorescence, but the fluorescence inside the transparent joint and the fluorescence of TINOPAL OB exposed from the joint were identified, and the inside of the joint was identified. It took some time to confirm the insertion state of the tube accurately. On the other hand, when the Leuch marker R-50 is applied to the VP tube and inserted into the receptacle, the receptacle emits purple light when irradiated with ultraviolet light from black light, and the Leuch marker R-50 exposed from the joint. Emitted red, and the violet and red fluorescence were visually recognized, confirming the insertion state of the pipe inside the joint. In addition, when the Leuhi marker R-50 is applied to the AC drain pipe and inserted into the receiving port, the receiving port emits light blue light by irradiation with ultraviolet light of black light, and the Leuhi marker R-50 exposed from the joint. Emitted red, and the blue and red fluorescence was visually recognized, so that the insertion state of the tube inside the joint could be easily confirmed. Furthermore, when the Leuhi marker R-70 is applied to the VP tube and inserted into the receiving port, the receiving port emits green light when irradiated with ultraviolet light from a black light, and the Leuhi marker R-70 exposed from the joint is bright. It was possible to easily confirm the insertion state of the pipe inside the joint by emitting green light and visually recognizing the green fluorescence. When the Leuhi marker R-70 is applied to the AC drain pipe and inserted into the receiving port, the receiving port emits blue light when irradiated with ultraviolet light from black light, and the Leuhi marker R-70 exposed from the joint turns green. It was possible to easily confirm the insertion state of the tube inside the joint by emitting light and visually recognizing blue and green fluorescence. When the Leuhi marker R-70 is used as an adhesive, the visibility of the Leuhi marker R-70 exposed from the joint also increases, and the length of the Leuhi marker R-70 can be instantly visually recognized. It was.

(Example 2)
The same VP pipe, AC drain pipe and transparent joint as in Example 1 were prepared, and a transparent AC drain joint (manufactured by Sekisui Chemical Co., Ltd.) (hereinafter simply referred to as AC drain transparent joint) was prepared. Leuch marker R-70, in which the content of the fluorescent material was changed from 0.001 wt% to 0.2 wt%, was applied to the end of each VP tube. Subsequently, a VP pipe was inserted into the receiving port of the transparent joint to obtain a piping structure. In addition, the content of the fluorescent material in Leuch marker R-70 was changed to 0.02% by weight, 0.14% by weight, and 0.2% by weight and applied to the end of the AC drain pipe. Subsequently, the AC drain pipe was inserted into the receiving port of the AC drain transparent joint to obtain a piping structure. Table 2 shows the results of visual recognition of the respective pipe structures when the content of the fluorescent substance in the Leuch marker R-70 is changed.

(Comparative Example 1)
A piping structure was obtained by using the same VP pipe and transparent joint as in Example 2 except that the content of the fluorescent substance in the Leuch marker R-70 was 0.0005% by weight. The results of visual recognition in this piping structure are shown in Table 2.

(Comparative Example 2)
A piping structure was obtained using the same VP pipe and transparent joint as in Example 2 except that the content of the fluorescent substance in the Leuch marker R-70 was 1.0% by weight. The results of visual recognition in this piping structure are shown in Table 2.

  As shown in Table 2, by setting the content of the fluorescent substance in the Leuhi marker R-70 to 0.001% by weight or more and 1.0% by weight or less, adhesion exposed from the socket and the joint by the ultraviolet light of black light. It was confirmed that the fluorescence of the agent was easily visible. In particular, when a VP pipe is connected to the transparent joint, if the content of the fluorescent substance in the Leuch marker R-70 is 0.02% by weight or more, the opening of the transparent joint can be easily visually recognized. It turned out to be preferable to emit fluorescence. In addition, if the content of the fluorescent substance in the Leuch marker R-70 is 0.1% by weight or more, it is more preferable that the receiving port of the transparent joint emits fluorescence with an intensity that can be more easily visually recognized. It was found that an amount of 0.2% by weight is more preferable because it emits fluorescent light with sufficient intensity so that the opening of the transparent joint can be visually recognized very easily.

  On the other hand, when the content of the fluorescent substance in the Leuich marker R-70 is 0.0005% by weight, the intensity of the fluorescence from the receiving port even if the light of the transparent joint is irradiated with ultraviolet light using black light. However, it was difficult to see. In addition, when the content of the fluorescent substance in Leuch marker R-70 is 1.0% by weight, it is exposed from the opening and the transparent joint when the transparent joint is irradiated with ultraviolet light using black light. The fluorescence from the adhesive was visually recognized in the same manner as when the content of the fluorescent material was 0.2% by weight. From this result, it is presumed that the effect of improving the visibility of the inserted state of the pipe inside the joint will reach its peak even if the content of the fluorescent substance is increased to more than 0.2% by weight.

50 ... piping structure, 51 ... joint, 52 ... receptacle, 52E ... end, 54 ... adhesive, 56 ... receptacle, 58 ... stopper, 60 ... ultraviolet light _{source, L} 54, L _{56 ...} Length

Claims (3)

A piping structure installed in a pipe space or ceiling space inside a building,
A transparent or translucent fitting with a receptacle;
A tube inserted into the receptacle;
An adhesive containing a light emitting substance that emits fluorescence when irradiated with ultraviolet light while fixing the tube to the receptacle interposed between the receptacle and the tube (however, a colorant, a light reflective property) Except for adhesives containing inorganic substances) ,
Have
Wherein the wavelength of the fluorescence Ri der than 550nm or less 500 nm,
The adhesive further contains a resin that is colorless and transparent to visible light, an organic solvent,
The luminescent material is soluble organic compound der Ru piping structure to the organic solvent.   The piping structure according to claim 1, wherein the adhesive contains 0.001% by weight or more and 1.0% by weight or less of the luminescent material. A method for inspecting a piping structure installed in a pipe space or a ceiling space inside a building,
A transparent or semi-transparent joint provided with a receiving port, a tube inserted into the receiving port, and being interposed between the receiving port and the tube, fixing the tube to the receiving port, and ultraviolet light adhesive containing a light-emitting substance that emits fluorescence by irradiation (but, colorants, except the adhesive containing a light reflecting inorganic substance) and, have a, the adhesive colorless transparent resin to visible light further comprises an organic solvent, wherein the luminescent material of the organic solvent with UV light irradiating the receptacle of soluble organic compounds der Ru piping structure, the piping structure of the wavelength of the fluorescence and 500nm or 550nm or less Inspection method.

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