Piping, piping structure, building

Abstract

To provide a pipeline which achieves reduction of work needed for connecting a pipeline and enables connection work to be performed efficiently.SOLUTION: A first pipeline 10 includes a socket part 11, a bend part 12, and a straight pipe part 13. The socket part 11 and the bend part 12 are joined through a bead part 15, and the bend part 12 and the straight pipe part 13 are joined through a bead part 15. The first pipeline 10 includes an electrification terminal 14 at the socket part 11.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to piping.

Background Art

[0002] Generally, polyethylene pipes are used for the vertical and horizontal water pipes in buildings. As polyethylene pipe products, mainly straight pipes, bent pipes (elbows), reducers, short bends, etc. are mainly produced. Also, joints are used when connecting them. As the joint, for example, an electric fusion joint is used. First, the ends of the pipes to be connected are inserted into the receiving port of the joint. Next, an electric current is passed through the heating wire provided inside the receiving port. Thereby, the pipes and the joint are fused by the generated heat. (See Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the conventional electric fusion joint has a configuration having only the joint portion. That is, for example, when connecting straight pipes with a bend portion at a construction site, it was necessary to use electric fusion joints at both ends of the bend portion. Therefore, it took a long time for pipe alignment and fusion, and the connection work efficiency was a problem.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a pipe that can reduce the work required for pipe connection and perform the connection work efficiently.

Means for Solving the Problems

[0006] To solve the aforementioned problems, the present invention proposes the following means. The piping according to the present invention comprises a receiving portion, a bend portion, and a straight pipe portion, wherein the receiving portion and the bend portion and the bend portion and the straight pipe portion are joined via a bead portion, and the receiving portion is provided with a terminal for conducting electricity.

[0007] According to this invention, the receiving section and the bend section, and the bend section and the straight pipe section are joined via a bead section, and the receiving section is equipped with terminals for conducting electricity. That is, the receiving section, the bend section, and the straight pipe section are delivered to the construction site in a pre-joined state. Therefore, when joining straight pipes using the bend section at the construction site, the pre-joined side does not need to be joined at the construction site. As a result, the work required for connection can be reduced. Thus, connection work can be performed efficiently.

[0008] Furthermore, the terminal may be located on a plane passing through the pipe axis of the bend and on the outside of the bend of the bend.

[0009] According to this invention, the terminal is located on the outside of the bend. This makes it easier to connect the terminal and the electrode, for example, when the connection point of the piping is located near the outside of a building corner.

[0010] Furthermore, the terminal may be located on a plane passing through the pipe axis of the bend and inside the curve of the bend.

[0011] According to this invention, the terminal is located inside the bend of the bend. This makes it easier to connect the terminal and the electrode, for example, when the connection point of the piping is located near the inside of a corner of a building.

[0012] Furthermore, the terminal may be located on a plane perpendicular to the plane passing through the pipe axis of the bend portion, and on the side of the bend portion in the direction of curvature.

[0013] According to this invention, the terminal is located on the side of the bend in the bend section. This makes it easy to connect the terminal and the electrode, for example, when the piping is installed so as to run near the ceiling or along the floor, that is, when the piping is installed, the plane passing through the pipe axis of the bend section is parallel to the ceiling or floor.

[0014] Furthermore, the surface of the straight pipe section may have a functional layer.

[0015] According to this invention, a functional layer is provided on the surface of the straight pipe section. When connecting the straight pipe with the functional layer using an electrofusion joint, it is necessary to remove the functional layer by cutting in order to ensure proper fusion. In other words, by pre-joining the straight pipe with the functional layer and the bend section, it becomes unnecessary to remove the functional layer. Therefore, the cutting work required during connection can be reduced. Furthermore, by increasing the length of the piping section with the functional layer, the corrosion resistance of the straight pipe section can be further ensured.

[0016] Furthermore, the straight pipe portion may have a fiber layer.

[0017] According to this invention, the straight pipe section has a fiber layer. However, when cutting the straight pipe section to size at the construction site, the fiber layer makes cutting at the construction site difficult. That is, by pre-joining the straight pipe section with the fiber layer and the bend section, it becomes unnecessary to cut the straight pipe section at the construction site. Therefore, the cutting work required during joining can be reduced.

[0018] Furthermore, the aforementioned piping may be used as sprinkler piping.

[0019] According to this invention, the piping is used as sprinkler piping. This allows for greater enjoyment of the effects and benefits of the present invention. [Effects of the Invention]

[0020] According to the present invention, it is possible to provide piping that reduces the work required for connecting pipes and allows for efficient connection work.

Brief Description of the Drawings

[0021] [Figure 1] It is a schematic cross-sectional view of a building having piping according to an embodiment of the present invention. [Figure 2] Regarding the piping according to an embodiment of the present invention, it is a front view of the piping having a terminal on the outer side of the bend. [Figure 3] Regarding the piping according to an embodiment of the present invention, it is a front view of the piping having a terminal on the inner side of the bend. [Figure 4] Regarding the piping according to an embodiment of the present invention, it is a front view of the piping having a terminal on the side surface of the first side of the bend. [Figure 5] Regarding the piping according to an embodiment of the present invention, it is a front view of the piping having a terminal on the side surface of the second side of the bend. [Figure 6] It is a diagram showing the detailed shape when the piping according to the present invention is of a small diameter. [Figure 7] It is a diagram showing the detailed shape when the piping according to the present invention is of a medium diameter. [Figure 8] It is a diagram showing the detailed shape when the piping according to the present invention is of a large diameter. [Figure 9] It is a front view showing the state of the piping shown in FIG. 2 during transportation. [Figure 10] It is a front view showing the state of the piping shown in FIG. 3 during transportation. [Figure 11] It is a front view showing the state of the piping shown in FIG. 4 during transportation. [Figure 12] It is a diagram showing the state in which the terminal of the piping shown in FIG. 2 faces the ceiling at the construction site. [Figure 13] It is a diagram showing the state in which the piping shown in FIG. 2 is used outside the corner of the building. [Figure 14] It is a diagram showing the state in which the straight pipe portion of the piping shown in FIG. 2 penetrates through the through-hole in the wall of the building. [Figure 15] It is a diagram showing the state of the piping shown in FIG. 14 as viewed from the XV-XV direction. [Figure 16]This figure shows the piping terminals shown in Figure 3 facing the floor at the construction site. [Figure 17] This figure shows the piping shown in Figure 3 being used inside the corner of a building. [Figure 18] Figure 5 shows the straight section of the piping as it penetrates a wall penetration hole in the building. [Figure 19] Figure 18 shows the piping as viewed from the XIX-XIX direction. [Figure 20] Figure 4 shows the straight section of the piping as it penetrates a wall penetration hole in the building. [Figure 21] Figure 20 shows the piping as viewed from the XXI-XXI direction. [Figure 22] Figure 5 shows the piping used on the outside of the corner of the building. [Figure 23] Figure 4 shows the piping used on the inside at the corner of a building. [Modes for carrying out the invention]

[0022] The following describes the piping according to one embodiment of the present invention, with reference to the drawings. As shown in Figure 1, the piping structure 100 installed in building 1 and used as a water supply and sewage system includes a first pipe 10, a second pipe 20, a horizontal pipe 40, and a support 50. The piping structure 100 can be used, for example, as a sprinkler system or a drain pipe.

[0023] Sprinkler piping is the piping that supplies water to sprinkler systems installed near the ceiling. The sprinkler system is supplied with water from the sprinkler piping and, in the event of a fire, sprays water into the rooms of building 1 to attempt initial fire suppression. For example, multiple sprinkler systems are installed at equal intervals on the ceiling 2. The sprinkler system consists of, for example, a horizontal pipe 40 as the main pipe, tee fittings, sub-main pipes, multi-port fittings, sprinkler outlets, and sprinkler heads.

[0024] Water is supplied to and sprayed to each of the multiple sprinkler systems as follows: First, water is distributed from multiple tee fittings on the main horizontal pipe 40 to the sub-main pipes. Next, water is further distributed from multiple multi-port fittings on each sub-main pipe. The water that flows down to the multi-port fittings is transported via a discharge pipe to the water spraying heads. Then, in the event of a fire, the heads are opened by a program or other means, and water is sprayed.

[0025] Drainage pipes, for example, in a multi-story building 1, transport wastewater generated on a certain floor to drainage facilities located above or below ground. Alternatively, they can be used to collect rainwater that falls on the roof of building 1 using gutters and transport it to drainage facilities located above or below ground via drainage pipes. In the example shown in Figure 1, this piping structure 100 is used as a drainage facility, not as a sprinkler system. Furthermore, when this piping structure 100 is used as a sprinkler system, pipes 10, 20, and 30, described later, are used together with the horizontal pipe 40 as the main pipe and sub-main pipe mentioned above.

[0026] In Figure 1, the first pipe 10 and the second pipe 20 are attached to the wall 3. Furthermore, the first pipe 10 and the second pipe 20 are connected to a horizontal pipe 40, which is fixed to the ceiling 2 or floor 4 by a support 50. This changes the orientation of the horizontal pipe 40, which is installed horizontally along the ceiling 2 or floor 4, to a vertical orientation along the wall 3.

[0027] The horizontal pipe 40 is installed parallel to the ceiling 2 or floor 4 of the building 1. The surface layer of the horizontal pipe 40 has a functional layer. Examples of functional layers include an oxygen barrier layer and a non-fusion layer. Therefore, when fusing the horizontal pipe 40, it is necessary to remove the functional layer on the surface by cutting or other means. Furthermore, the straight pipe section 13 has a fibrous layer inside to ensure heat resistance. Glass fibers are mainly used for the fibrous layer.

[0028] The nominal diameter of the horizontal pipe 40 is selected appropriately according to its purpose. When used in sprinkler piping, pipes with a nominal diameter of 40 mm to 100 mm are preferably used, while when used in drainage facilities, pipes with a nominal diameter of 40 mm to 200 mm are preferably used. Furthermore, for the horizontal pipe 40, for example, Eslo Hyper AW (registered trademark, manufactured by Sekisui Chemical Co., Ltd.) is preferably used.

[0029] The support 50 fixes the horizontal pipe 40, the first pipe 10, or the second pipe 20. In the building 1 of this embodiment, the support 50 fixes the horizontal pipe 40 to the ceiling 2 or the floor 4, for example. The support 50 also fixes the first pipe 10 or the second pipe 20 to the wall 3. The support member 50 has a portion for gripping the horizontal pipe 40, first pipe 10, or second pipe 20 to be fixed, and a portion for fixing to the ceiling 2, wall 3, or floor 4. The size of the support member 50 is appropriately selected according to the diameter of the object to be fixed.

[0030] As shown in Figure 2, the first pipe 10 has a receiving section 11, a bend section 12, a straight pipe section 13, and a terminal 14. The socket portion 11 is the part into which the horizontal pipe 40, which is the connecting partner of the first pipe 10, is inserted. The socket portion 11 has an electric heating wire (not shown) on its inner diameter side. After inserting the horizontal pipe 40, an electric current is applied to the electric heating wire to generate heat. This fuses and fixes the horizontal pipe 40 and the socket portion 11 together. The socket portion 11 is a so-called electrofusion joint (EF joint).

[0031] The bend section 12 changes the orientation of the pipe axis of the receiving section 11 toward the pipe axis of the straight pipe section 13. One end of the bend section 12 is joined to the receiving section 11. The other end of the bend section 12 is fixed to one end of the straight pipe section 13. In this embodiment, the bending angle of the bent portion 12 is 90°. That is, the relative angle between the pipe axis of the receiving portion 11 and the pipe axis of the straight pipe portion 13 is 90°. This allows, for example, the orientation of the pipe axis of a horizontal pipe 40, which is installed horizontally in building 1 and connected to the receiving section 11, to be changed to a vertical orientation toward wall 3.

[0032] The straight pipe section 13 transports, for example, the wastewater that flows in from the horizontal pipe 40 through the receiving section 11 to the lower floor. One end of the straight pipe section 13 is connected to the other end of the bend section 12. The receiving portion 11, the bend portion 12, and the straight pipe portion 13 are preferably made of an olefin resin (for example, polyethylene) or a thermoplastic polyester resin. Furthermore, as the base material for the straight pipe section 13, Eslo Hyper AW (registered trademark, manufactured by Sekisui Chemical Co., Ltd.) is preferably used, similar to the horizontal pipe 40.

[0033] Two terminals 14 are provided at intervals around the outer circumference of the receiving portion 11. The terminals 14 are provided for energizing the heating element located inside the receiving portion 11. That is, current is supplied to the heating element by connecting the electrodes of an external power supply to the terminals 14. The terminals 14 are also provided parallel to the pipe axis of the straight pipe portion 13.

[0034] In the first piping 10, the mounting position of the terminal 14 is on a plane that passes through the pipe axis of the bend portion 12, that is, on a plane that has both the pipe axis of the orthogonal receiving portion 11 and the pipe axis of the straight pipe portion 13. In addition, the terminal 14 is provided on the outside of the bend of the bend portion 12 in the receiving portion 11.

[0035] The bead portion 15 is located between the receiving portion 11 and the bend portion 12, and between the bend portion 12 and the straight pipe portion 13. The bead portion 15 is formed during the manufacturing of the first pipe 10 by joining the receiving portion 11 and the bend portion 12, or the bend portion 12 and the straight pipe portion 13, at the factory. For joining, butt joints are mainly preferred. That is, the pre-formed receiving portion 11 and the bend portion 12, or the pre-formed bend portion 12 and the straight pipe portion 13, are joined by butting them together while heated and applying pressure.

[0036] As shown in Figure 3, the second pipe 20 has a receiving section 21, a bend section 22, a straight section 23, and a terminal 24. The only difference between the first pipe 10 and the second pipe 20 is the mounting position of the terminals 14 and 24 in the receiving sections 11 and 21. In other words, the other components (receiving sections 11 and 21, bend sections 12 and 22, straight pipe sections 13 and 23, and bead sections 15 and 25) are the same for both. In the second piping 20, the mounting position of the terminal 24 is on a plane passing through the pipe axis of the bend 22, that is, on a plane having both the pipe axis of the orthogonal receiving section 21 and the pipe axis of the straight pipe section 23. In addition, the terminal 24 is provided on the inside of the bend of the bend 22 in the receiving section 21. Furthermore, the terminal 24 is provided parallel to the pipe axis of the straight pipe section 23.

[0037] Furthermore, as shown in Figure 4 for the third pipe 30a and Figure 5 for the third pipe 30b, terminals 34a and 34b may be located on a plane perpendicular to the plane passing through the pipe axis of the bend 32, and on the side of the bend 32 in the direction of curvature. In this case, terminals 34 and 34b are provided perpendicular to the plane through which the bend 32 passes.

[0038] The only difference between the third pipes 30a and 30b is the mounting position of the terminals 34a and 34b at the receiving end 31. In other words, the other components (receiving end 31, bend 32, straight pipe section 33, and bead section 35) are all the same as those of the first pipe 10 and the second pipe 20. In the following, for convenience, the third pipes 30a and 30b may be collectively referred to as the third pipe 30, and terminals 34a and 34b may be collectively referred to as terminal 34.

[0039] The diameters of the first pipe 10, the second pipe 20, and the third pipe 30 (pipes 10, 20, and 30) are appropriately selected according to the usage conditions and construction conditions in building 1. Figures 6 to 8 show the shape of the second pipe 20 as an example, with each pipe designated as 20S, 20M, and 20L depending on its diameter. The second pipe 20S shown in Figure 6 is an example where the diameter is relatively small. The nominal diameter of the second pipe 20S is 40 to 65 mm. The second pipe 20M shown in Figure 7 is an example where the diameter is of medium size. The nominal diameter of the second pipe 20M is 75-100 mm. The second pipe 20L shown in Figure 8 is an example where the diameter is relatively large. The nominal diameter of the second pipe 20L is 125 to 200 mm.

[0040] Furthermore, the length of the straight pipe sections 13, 23, and 33 of pipes 10, 20, and 30 at the time of manufacture is 2000 to 5000 mm, regardless of the sizes mentioned above. The straight pipe sections 13, 23, and 33 are cut to size as appropriate to suit the conditions of the construction site. The straight pipe sections 13, 23, and 33 are longer than the receiving sections 11, 21, and 31.

[0041] As shown in Figures 9 to 11, when transporting pipes 10, 20, and 30 from the factory to the construction site, it is common practice to stack them so that the planes passing through the pipe axes of each bend section 12, 22, and 32 are parallel. In this case, the terminal 14 of the first pipe 10 shown in Figure 9 is positioned parallel to the pipe axis of the straight pipe section 13. Therefore, the terminal 14 does not come into contact with adjacent first pipes 10. This prevents damage to the terminal 14 from contact with adjacent first pipes 10 during transport.

[0042] In addition to the above, as shown in Figure 10, the second pipe 20 has a terminal 24 on the inside of the bending direction of the bend portion 22. This prevents the terminal from coming into contact with adjacent second pipes 20, as well as with the loading platform or other equipment used to store the second pipes 20 during transport.

[0043] As shown in Figure 11, in the case of the third pipe 30, unlike the cases of the first pipe 10 and the second pipe 20, the terminal 34 faces the adjacent third pipe 30. Therefore, the terminal 34 and the receiving portion 31 may come into contact during transport. For this reason, when transporting multiple third pipes 30, special care must be taken to protect the terminal 34.

[0044] Next, we will explain in what parts of building 1 each pipe 10, 20, and 30 are suitable for use. Figure 12 shows an example where the first pipe 10 is installed near the ceiling 2. In this case, the terminal 14 faces the ceiling 2. When attempting to pass current through the terminal 14, the ceiling 2 and the electrode interfere with each other, making it difficult to connect the electrode to the terminal 14. Furthermore, when this configuration is fixed to the building 1, a gap is created between the ceiling 2 and the receiving portion 11, not only for the terminal 14 but also to secure working space. As a result, the final fit after installation is poor.

[0045] Therefore, as shown in Figure 13, the first pipe 10 is preferably installed along the outside of the corner of the wall 3, for example. This arrangement ensures sufficient space when connecting the terminal 14 and the electrode. Furthermore, it improves the fit after installation.

[0046] Furthermore, as shown in Figures 14 and 15, the straight section 13 of the first pipe 10 may be passed through the through-hole in the wall 3. In this case, when the receiving section 11 is aligned with the wall 3 via the bend section, the terminal 14 will face the opposite side of the wall 3. This ensures sufficient space when connecting the terminal 14 to the electrode. Moreover, it improves the fit after placement.

[0047] Figure 16 shows an example where the second pipe 20 is installed near the floor 4. In this case, the terminal 24 faces the floor 4. When attempting to pass current through the terminal 24, the floor 4 and the electrode interfere with each other, making it difficult to connect the electrode to the terminal 24. Furthermore, if the structure is fixed to the building 1 in this state, a gap equal to the size of the terminal 24 will be created between the floor 4 and the receiving portion 21. This results in a poor fit after installation. Therefore, as shown in Figure 17, the second pipe 20 is preferably installed, for example, along the inside of the corner of the wall 3. This arrangement ensures sufficient space when connecting the terminal 24 and the electrode. Furthermore, it improves the fit after installation.

[0048] Figures 18 and 19 show an example of the third pipe 30b being installed near the ceiling 2 and through a through-hole in the wall 3 via the straight pipe section 33. In this case, the terminal 34b faces the ceiling 2. When attempting to pass current through the terminal 34b, interference between the ceiling 2 and the electrode makes it difficult to connect the electrode to the terminal 34b. Furthermore, if the pipe is fixed to the building 1 in this state, a gap equal to the size of the terminal 34b will be created between the ceiling 2 and the receiving section 31. This results in a poor fit after installation.

[0049] However, under similar construction conditions, if the third pipe 30a is selected, the orientation of the terminal 34a will be opposite to that of the ceiling 2, as shown in Figures 20 and 21. In other words, construction conditions with limited space can be addressed simply by changing the piping used. Furthermore, as shown in Figures 14 and 15, we will compare this with an example in which the first pipe 10 is used in a similar location. The terminal 14 of the first pipe 10 is located parallel to the ceiling 2. In contrast, the terminal 34a of the third pipe 30a is located perpendicular to the ceiling 2.

[0050] Now, let's consider the operation of connecting the horizontal pipe 40 to the first pipe 10 or the third pipe 30a near the ceiling 2, as described above. Even when using the first pipe 10, it is possible to secure space to connect the electrode to the terminal 14, as shown in Figures 14 and 15. In contrast, when using the third pipe 30a, as shown in Figures 20 and 21, the terminal 34a faces directly downwards. That is, the terminal 34a faces closer to the worker. Therefore, the operation of connecting the electrode can be performed more easily.

[0051] Therefore, when installing near the ceiling 2, the third pipe 30 is preferable to the first pipe 10 and the second pipe 20. Furthermore, considering that the terminal 34 faces closer to the worker, the same can be said when installing near the floor 4.

[0052] However, as mentioned above, special care is required when transporting the third pipe 30 to the construction site. Furthermore, the third pipe 30 is divided into two types, 30a and 30b, depending on the orientation of the terminal 34 relative to the bending direction of the bend section 32. Therefore, if the type of third pipe 30 is not properly managed at the construction site, the wrong type may be installed, potentially resulting in a situation like that shown in Figure 18.

[0053] In contrast, the terminals 14 of the first pipe 10 are not classified by the direction of the bend in the bend section 12. The same can be said for the terminals 24 of the second pipe 20. Therefore, it can be said that the first pipe 10 and the second pipe 20 are easier to manage in terms of type than the third pipe 30. Based on these considerations, it is possible to select each pipe appropriately depending on the construction and usage conditions. For example, by using a piping group that appropriately combines pipes 10, 20, and 30, the ease of construction can be improved.

[0054] As described above, according to the piping 10, 20, and 30 of the present invention, the receiving portions 11, 21, and 31 and the bend portions 12, 22, and 32, and the bend portions 12, 22, and 32 and the straight pipe portions 13, 23, and 33 are joined via bead portions 15, 25, and 35, and the receiving portions 11, 21, and 31 are equipped with terminals 14, 24, and 34 for conducting electricity. In other words, the receiving portions 11, 21, and 31, the bend portions 12, 22, and 32, and the straight pipe portions 13, 23, and 33 are delivered to the construction site in a pre-joined state. Therefore, when joining straight pipes at the construction site using the bend portions 12, 22, and 32, the pre-joined side does not need to be joined at the construction site. Therefore, the work required for connection can be reduced. Thus, connection work can be performed efficiently.

[0055] Furthermore, the terminal 14 is located on the outside of the bend in the bend portion 12. This makes it easier to connect the terminal 14 to the electrode, for example, when the connection portion of the first pipe 10 is located near the outside of a corner of the building 1.

[0056] Furthermore, the terminal 24 is located inside the bend of the bend portion 22. This makes it easier to connect the terminal 24 to the electrode, for example, when the connection portion of the second pipe 20 is located near the inside of a corner of the building 1.

[0057] Furthermore, the terminal 34 is located on the side of the bend in the bend portion 32. This makes it easy to connect the terminal 34 to the electrode, for example, when the third pipe 30 is installed so as to run near the ceiling or along the floor, that is, when the third pipe 30 is installed, the plane through which the pipe axis of the bend portion 32 passes is parallel to the ceiling or floor.

[0058] Furthermore, the straight pipe sections 13, 23, and 33 have a functional layer on their surface. When connecting the straight pipe sections 13, 23, and 33 with the functional layer using electrofusion joints, it is necessary to remove the functional layer by cutting in order to ensure proper fusion. In other words, by pre-joining the straight pipe sections 13, 23, and 33 with the functional layer and the bend sections 12, 22, and 32, it becomes unnecessary to remove the functional layer. Therefore, the cutting work required during connection can be reduced. Moreover, by increasing the length of the piping with the functional layer, the corrosion resistance of the straight pipe sections 13, 23, and 33 can be further ensured.

[0059] Furthermore, the straight pipe sections 13, 23, and 33 have a fiber layer. In this case, when cutting the straight pipe sections 13, 23, and 33 to size at the construction site, the fiber layer makes cutting at the construction site difficult. That is, by pre-joining the straight pipe sections 13, 23, and 33 with the bend sections 12, 22, and 32, it becomes unnecessary to cut the straight pipe sections 13, 23, and 33 at the construction site. Therefore, the cutting work required during joining can be reduced.

[0060] Furthermore, pipes 10, 20, and 30 are used as sprinkler pipes. This allows for greater enjoyment of the effects and benefits of the present invention.

[0061] Furthermore, terminals 14, 24, and 34 on pipes 10, 20, and 30 are positioned so as not to face the wall. This facilitates the connection of terminals 14, 24, and 34 to the electrodes of the external power supply. As a result, the time required to align terminals 14, 24, and 34 can be reduced, allowing for more efficient connection work.

[0062] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the surface of the straight pipe sections 13, 23, and 33 does not necessarily have to have a functional layer. Furthermore, the straight pipe sections 13, 23, and 33 do not necessarily have a fiber layer.

[0063] Furthermore, the straight pipe sections 13, 23, and 33 may have bends 12, 22, and 32 and receiving sections 11, 21, and 31 at both ends, not just at one end. In that case, the types of terminals 14, 24, and 34 provided at the receiving sections 11, 21, and 31 on both sides may be different.

[0064] Furthermore, terminals 14, 24, and 34 do not necessarily have to be provided parallel to the pipe axis of the straight pipe sections 13, 23, and 33, or perpendicular to the plane through which the bend section 32 passes. Furthermore, although this embodiment describes the straight pipe sections 13, 23, and 33 of the pipes 10, 20, and 30 as being installed in the vertical direction, the straight pipe sections 13, 23, and 33 may be installed in the horizontal direction, and the member equivalent to the horizontal pipe 40 may be described in the vertical direction. Furthermore, if the straight pipe sections 13, 23, and 33 are installed horizontally near the ceiling 2, sprinkler systems may be installed in the straight pipe sections 13, 23, and 33.

[0065] Furthermore, the surfaces of the straight pipe sections 13, 23, and 33 may be provided with wide, stripe-shaped linear patterns aligned with the pipe axis to indicate their intended use, such as sprinkler piping or drainage pipes. The intended use can be distinguished by changing the color, shape, and thickness of the linear patterns. The linear patterns may be printed on the surface of the straight pipe section 13, or the same resin composition as that constituting the straight pipe section 13 may be laminated onto the surface of the straight pipe section 13. The number of linear patterns provided on the surfaces of the straight pipe sections 13, 23, and 33 is not particularly limited, but if multiple linear patterns are provided, it is preferable that the spacing between them be equal. For example, if there are two linear patterns, they may be placed at 180-degree intervals; if there are three linear patterns, they may be placed at 120-degree intervals; and if there are four linear patterns, they may be placed at 90-degree intervals. Furthermore, this straight line may represent the positions where terminals 14, 24, and 34 are provided. For example, the straight line provided on the surface of the straight pipe sections 13, 23, and 33 and the terminals 14, 24, and 34 may be located on a plane passing through the pipe axis of the bend section, or the straight line provided on the surface of the straight pipe sections 13, 23, and 33 and the terminals 14, 24, and 34 may be located on a plane perpendicular to the plane passing through the pipe axis of the bend section.

[0066] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of Symbols]

[0067] 3 walls 10. First Piping 20 Second Piping 30, 30a, 30b 3rd piping 11, 21, 31 Receiving opening 12, 22, 32 Bend section 13, 23, 33 Straight pipe section Terminals 14, 24, 34, 34a, 34b 15, 25, 35 Bead section 40 Horizontal pipe 50 Supports 100 Piping structure

Claims

1. Piping installed within a building, The receiving part and, The bend section and, The straight pipe section, Equipped with, The receiving portion and the bend portion, and the bend portion and the straight pipe portion are joined via a bead portion. The aforementioned receiving portion is equipped with terminals for conducting electricity. The nominal diameter of the aforementioned straight pipe section is 40 mm to 200 mm. The surface of the straight pipe section is provided with a stripe-shaped linear pattern along the pipe axis, The linear pattern is provided on a plane passing through the pipe axis of the bend, or on a plane perpendicular to the plane passing through the pipe axis of the bend. The aforementioned linear pattern represents the position where the terminal is provided. Piping.

2. Piping installed within a building, The receiving part and, The bend section and, The straight pipe section, Equipped with, The receiving portion and the bend portion, and the bend portion and the straight pipe portion are joined via a bead portion. The aforementioned receiving portion is equipped with terminals for conducting electricity. The nominal diameter of the aforementioned straight pipe section is 40 mm to 200 mm. The surface of the straight pipe section is provided with a stripe-shaped linear pattern along the pipe axis, The aforementioned linear pattern is provided on a plane passing through the pipe axis of the bend portion, The terminal is located on a plane passing through the pipe axis of the bend and on the outside of the bend of the bend. Piping.

3. Piping installed within a building, The receiving part and, The bend section and, The straight pipe section, Equipped with, The receiving portion and the bend portion, and the bend portion and the straight pipe portion are joined via a bead portion. The aforementioned receiving portion is equipped with terminals for conducting electricity. The nominal diameter of the aforementioned straight pipe section is 40 mm to 200 mm. The surface of the straight pipe section is provided with a stripe-shaped linear pattern along the pipe axis, The aforementioned linear pattern is provided on a plane passing through the pipe axis of the bend portion, The terminal is located on a plane passing through the pipe axis of the bend and on the inside of the bend of the bend. Piping.

4. Piping installed within a building, The receiving part and, The bend section and, The straight pipe section, Equipped with, The receiving portion and the bend portion, and the bend portion and the straight pipe portion are joined via a bead portion. The aforementioned receiving portion is equipped with terminals for conducting electricity. The nominal diameter of the aforementioned straight pipe section is 40 mm to 200 mm. The surface of the straight pipe section is provided with a stripe-shaped linear pattern along the pipe axis, The aforementioned linear pattern is provided on a plane perpendicular to the plane passing through the pipe axis of the bend portion. The terminal is located on a plane perpendicular to the plane passing through the pipe axis of the bend portion, and on the side of the bend portion in the direction of curvature. Piping.

5. The straight tube portion has a fiber layer, The piping according to any one of claims 1 to 4.

6. Used as sprinkler piping, The piping according to any one of claims 1 to 5.

7. Multiple linear patterns are provided, The piping according to any one of claims 1 to 6.

8. A pipe according to any one of claims 1 to 7, The bent section and the straight section are each provided with a support for fixing them to the building. Piping structure.

9. A pipe according to any one of claims 1 to 7, A second pipe connected to the receiving end of the aforementioned pipe, The straight pipe section and the second pipe section are each provided with a support for fixing them to the building. Piping structure.

10. A building having the piping structure described in claim 8 or 9.

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