Drainage piping systems, buildings

Abstract

To provide a structure of a drain assembly joint which can be verified inside of the pipe easily when the defect occurs in the pipe.SOLUTION: The bend joint of the invention is a bend joint constituted in polyolefin resin and applied for a drain piping having a siphon generating part, comprises a first straight pipe part, a second straight pipe part and a bend pipe part for coupling the first straight pipe part and the second straight pipe part and a third straight pipe part is formed at a midway part of the bend pipe part and both of a cross angle of a shaft line of the first straight pipe part and a shaft line of the third straight pipe part, and a cross angle of a shaft line of the second straight pipe part and a shaft line of the third straight pipe part are equal to or smaller than 45 degrees.SELECTED DRAWING: Figure 1

Description

Technical Field

[0004] ,

[0005] , , , , ,

[0001] The present invention relates to a bend joint and a drainage pipe system provided with the bend joint.

Background Art

[0002] In recent years, with the increasing frequency of heavy rainstorms, in order to efficiently drain rainwater from buildings, rainwater pipes tend to be enlarged. In contrast, a rainwater drainage means that enables reduction in the diameter of rainwater pipes and the number of vertical rainwater pipes by using the siphon phenomenon is used.

[0003] For example, Patent Document 1 discloses a siphon-type rainwater drainage device that can drain a large amount of rainwater extremely efficiently by the siphon action during heavy rain without increasing costs or damaging the appearance of the building. In the siphon-type rainwater drainage device described in Patent Document 1, a lid is provided at a predetermined interval (interval in the height direction) above the rainwater inlet, and the flow rate of the rainwater falling from the inlet into the drain pipe can be controlled so as to be in a full-flow state inside the drain pipe. By maintaining this state, the siphon phenomenon generated can be utilized to efficiently drain rainwater.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the drain pipe of a building, there is inevitably a joint part connecting the vertical pipe to the horizontal pipe. However, if the full-water state inside the drain pipe is interrupted inside the joint, there is a risk that the siphon phenomenon cannot be manifested in the entire drain pipe. Therefore, in order to avoid hindering the occurrence of the siphon phenomenon at the joint portion of a drain pipe equipped with a siphon generating section, it is considered advantageous to use a bent product 100 with a cross-sectional structure as shown in Figure 11, which is made of a bent product that curves with a continuous curvature.

[0006] However, the resin bending process bend 100 is manufactured by heating and softening a straight pipe and then fitting it into a mold. As a result, although the inner surface is smooth, there are problems such as wrinkling or buckling when the bending angle is large, and product strength decreases when the outer surface is thin. If wrinkles form on the inner surface of the pipe wall of the bent 100 pipe, the flow of drainage may be disrupted at the wrinkled area, and in some cases, this may hinder the siphon effect. Furthermore, the inability to increase the bending angle in the bending process bend 100 presents a problem in that the joint dimensions cannot be reduced, which can lead to a poor fit of the joint.

[0007] Alternatively, a 90° bend 101 of an injection-molded product with the cross-sectional structure shown in Figure 12 could be used as the bend. However, since the injection-molded product bend 101 has a 90° bent portion 102 at the inner corner, the presence of this bent portion 102 may hinder the occurrence of the siphon effect.

[0008] The present invention has been made in view of the circumstances described above, and aims to provide a bend joint and a drainage piping system equipped with a bend joint that are suitably used in drainage piping having a siphon generating section. [Means for solving the problem]

[0009] To solve the aforementioned problems, the present invention proposes the following embodiments. "1" The bend joint according to this embodiment is made of an olefin resin and is applied to a drainage pipe having a siphon generating section, comprising a first straight pipe section, a second straight pipe section, and a bend pipe section connecting the first straight pipe section and the second straight pipe section, wherein a third straight pipe section is formed in the middle of the bend pipe section, and the intersection angle of the axis of the first straight pipe section and the axis of the third straight pipe section, and the intersection angle of the axis of the second straight pipe section and the axis of the third straight pipe section are both 45° or less.

[0010] By connecting the first and second straight pipe sections with a bend pipe section, providing a third straight pipe section in the middle of the bend pipe section, connecting the first and third straight pipe sections at an intersection angle of 45° or less, and connecting the second and third straight pipe sections at an intersection angle of 45° or less, wastewater can be drained without changing the direction of water flow at an angle greater than 45°. Assuming that water is poured into the drainage pipe from the siphon generation section in a full state, the full state can be maintained at the bend joint while draining. Therefore, efficient drainage utilizing the siphon phenomenon can be achieved throughout the entire drainage pipe having a siphon generation section and a bend joint. If the bend fitting is made of olefin resin, it is more resistant to vibration and impact than PVC pipes, etc., and can therefore be provided as a bend fitting that is less likely to be damaged even when subjected to vibrations such as earthquakes. In particular, for rainwater drainage piping, it is important that it can drain efficiently during heavy rain and is also resistant to damage even when subjected to vibrations such as earthquakes. With drainage piping using this type of bend fitting, there is no risk of damage even in the event of a major earthquake, and a highly safe drainage piping can be provided.

[0011] "2" In the bend joint according to this embodiment, the first straight pipe section is butt-jointed to a first straight pipe made of olefin resin, the second straight pipe section is butt-jointed to a second straight pipe made of olefin resin, and the siphon generating section is connected to either the first straight pipe or the second straight pipe via an EF joint or a housing joint.

[0012] By adopting a configuration in which the first straight pipe section is butt-jointed to a first straight pipe made of olefin resin, and the second straight pipe section is butt-jointed to a second straight pipe made of olefin resin, a connection structure can be provided in which there are fewer irregularities on the inner surface of the joint portion caused by beads. Furthermore, although some unevenness occurs in the butt joints due to the beads, the butt joints connecting the first straight pipe section and the second straight pipe section are both located within the straight pipe sections, so they have little effect on the flow of wastewater and do not adversely affect the occurrence of the siphon effect. Therefore, it is possible to provide a bend joint that does not hinder the occurrence of the siphon phenomenon in the siphon generation section.

[0013] "3" In this embodiment, the third straight pipe section is divided into two third straight pipe section divisions, and it is preferable that the third straight pipe section is formed by butt joining the first third straight pipe section division in the first elbow pipe and the other third straight pipe section division in the second elbow pipe, with the third straight pipe section being divided into two third straight pipe section divisions, the first straight pipe section division in the first elbow pipe and the other third straight pipe section division in the second elbow pipe.

[0014] By using a split structure consisting of a first elbow pipe and a second elbow pipe, the bend of each elbow pipe can be made to 45° or less, allowing each elbow pipe to be made from an injection-molded part. For bend pipes with a bend of 45° or less, there is a high degree of design freedom for the shape of injection-molded bend pipes, and even when two are combined, a structure that fits better can be adopted compared to bend pipes made by bending. Furthermore, although there are some irregularities caused by the bead at the butt joint, since the butt joint is located in the third straight pipe section, i.e., the straight pipe section, it has little effect on the flow of drainage and does not adversely affect the occurrence of the siphon effect.

[0015] "4" The drainage piping system of this embodiment comprises a plurality of siphon generating units provided in a plurality of roof drains of a building, and a water collection pipe connected to the plurality of siphon generating units, characterized in that the siphon generating units and the water collection pipe are connected by a first straight pipe and a second straight pipe, and a bend joint as described in any of "1" to "3" provided by connecting the first straight pipe and the second straight pipe.

[0016] By using this type of bend joint, it is possible to create a joint that does not hinder the occurrence of the siphon phenomenon, allowing more wastewater to flow through a single collection pipe than with conventional collection pipes. Therefore, it becomes possible to connect multiple siphon generating units to a single collection pipe, and wastewater from multiple siphon generating units can be efficiently drained using a single collection pipe. Furthermore, compared to a drainage piping system where one collection pipe and one vertical pipe are connected to one siphon generating unit, both the number of collection pipes and vertical pipes can be reduced. As a result, the number of water collection pipes and vertical pipes installed in buildings can be reduced, allowing for the provision of an inexpensive drainage piping system.

[0017] "5" This form of drainage piping system can adopt a configuration in which a vertical pipe is connected to a part of the water collection pipe via a bend fitting described in any of "1" to "3". "6" This form of drainage piping system can employ a configuration in which a horizontal pipe is connected to a part of the vertical pipe via a bend fitting described in any of "1" to "3".

[0018] The aforementioned bend joint can be installed by connecting it to vertical or horizontal pipes, and by installing it in these, it is possible to provide a structure that does not hinder the occurrence of the siphon phenomenon in the entire water distribution pipe, including the first straight pipe, the second straight pipe, and the vertical and horizontal pipes connected to them. [Effects of the Invention]

[0019] According to the present invention, assuming that water is poured into a drain pipe in a full water state from a siphon generating section, it is possible to drain water while maintaining the full water state through a portion of a bend joint, and efficient drainage utilizing the siphon phenomenon can be achieved throughout the drain pipe including the portion of the bend joint. Moreover, if it is a bend joint made of an olefin resin, since it is more resistant to vibration and impact than a PVC pipe or the like, it is possible to provide a highly safe bend joint that is less likely to be damaged even when subjected to vibrations such as earthquakes.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 10 is a partial cross-sectional view showing an example of a drain pipe provided with a bend joint and an EF joint according to a first embodiment of the present invention. [Figure 2] FIG. 13 is a longitudinal cross-sectional view showing the bend joint. [Figure 3] FIG. 16 is a cross-sectional view showing a first example of a siphon generating section applied to a drain pipe having the configuration shown in FIG. 1. [Figure 4] FIG. 19 is a cross-sectional view showing a second example of a siphon generating section applied to a drain pipe having the configuration shown in FIG. 1. [Figure 5] FIG. 22 is a view showing an example of a drain pipe system configured when a drain pipe provided with the bend joint shown in FIG. 1 is applied to a building. <从这里开始,我将按照你提供的文本顺序依次翻译每个段落。 [Figure 6] FIG. 25 is a side view showing an example of a bend joint and an EF joint connected to the lower end of the vertical pipe shown in FIG. 1. [Figure 7] FIG. 28 is a partial cross-sectional view showing an example of a drain pipe provided with a bend joint according to a second embodiment of the present invention. [Figure 8] FIG. 31 is an explanatory view showing the relationship of fit regarding the bend joint according to the embodiment, a conventional bent bend, and a conventional injection molded bend. [Figure 9] FIG. 34 is a cross-sectional view showing an example of joining a single-sided receiving port EF joint to the bend joint shown in FIG. 2. [Figure 10] FIG. 37 is a partial cross-sectional view showing an example of a housing joining joint. [Figure 11] FIG. 40 is a side view showing an example of a conventional bend joint made of a bent product. [Figure 12]This is a side view showing an example of a conventional bend joint made from an injection-molded part. [Figure 13] This is a partial side view showing an example of drainage piping equipped with a bend joint according to the first example of the present invention. [Figure 14] This is a partial side view showing an example of drainage piping equipped with a bend joint according to a second example of the present invention. [Modes for carrying out the invention]

[0021] The following describes an example of a rainwater drainage system equipped with a bend joint according to one embodiment of the present invention, with reference to Figures 1 to 3. The rainwater drainage system equipped with the bend joint according to this embodiment can be applied, for example, to the drainage of buildings such as office buildings and condominiums. In the embodiment shown in Figure 1, a connecting pipe S is provided to penetrate vertically through the structure of the rooftop floor of the building, and a roof drain section RD is provided. A siphon generating section 2 is connected to the upper end of this connecting pipe S. In the example of Figure 1, the upper end of the connecting pipe S and the siphon generating section 2 are arranged to fit into a recess 3 provided on the upper surface of the rooftop slab of the building.

[0022] A first straight pipe 1 is connected to the lower part of the connecting straight pipe S via an electrofusion socket fitting (hereinafter referred to as an EF fitting) 4, and a second straight pipe (horizontal pipe) 6 is joined to its lower end via a bend fitting 5. Furthermore, the second straight pipe 6 is connected to multiple other straight pipes (horizontal pipes) via, for example, two EF fittings 4 and a horizontal pipe 9, and the second straight pipe 6 is further connected to a vertical pipe 8 via a bend fitting 7, the first straight pipe 1, and an EF fitting 4. The part joined by the EF fitting 4 is referred to as the EF joint 4A. The structure of the siphon generation unit 2 can be the one shown in Figure 3 or Figure 4, but these structures will be described in detail later. Furthermore, since the roof drain section RD is also installed on the balcony floor or veranda of a building, this configuration can also be applied to roof drains installed in these locations.

[0023] In the structure shown in Figure 1, the rainwater drainage device 10 is composed of a siphon generating section 2, a connecting straight pipe S, a plurality of EF joints 4, a first straight pipe 1, a bend joint 5, a second straight pipe 6, a horizontal pipe 9, a bend joint 7, and a vertical pipe 8. In this example structure, the connecting straight pipe S, the first straight pipe 1, the bend joint 5, the second straight pipe 6, the horizontal pipe 9, the bend joint 7, and the vertical pipe 8 are all made of olefin resin. Examples of olefin resins that can be used include polyethylene (PE), polypropylene (PP), and polybutene (PB).

[0024] The EF (electrofusion) joint 4 is composed of a straight pipe body having receiving ports on both sides. A heating wire is incorporated into the inner circumference of the straight pipe body, and a cable connector 4a for energizing the heating wire is provided on the outer circumference of the straight pipe body. One end of the connecting straight pipe S is inserted into one receiving port of the straight pipe body, and one end of the first straight pipe 1 is inserted into the other receiving port. The straight pipe body is made of the aforementioned olefin resin. In the EF joint 4, the cable connectors 4a, 4a are connected to a fusion splicer (not shown) and energized, heating the heating element to fuse the connecting straight pipe S to one receiving end of the straight pipe body, and the first straight pipe 1 to the other receiving end.

[0025] Since the first straight pipe 1 is positioned vertically and the second straight pipe 6 is positioned horizontally, the bend joint 5 connecting the first straight pipe 1 and the second straight pipe 6 is a type of 90° bend, and this bend joint 5 has the cross-sectional structure shown in Figure 2. The bend joint 5 consists of a first elbow pipe 11 provided on the first straight pipe 1 side and a second elbow pipe 12 provided on the second straight pipe 6 side. In the first elbow pipe 11, a first straight pipe section 13 is formed on the side of the first straight pipe 1, and in the second elbow pipe 12, a second straight pipe section 15 is formed on the side of the second straight pipe 6. In the first elbow pipe 11 and the second elbow pipe 12, a third straight pipe section 16 is formed at the joint between them. In the third straight pipe section 16, a divided third straight pipe section 17 is formed on the first elbow pipe 11 side, and a divided third straight pipe section 18 is formed on the second elbow pipe 12 side. The third straight pipe section division 17 and the third straight pipe section division 18 are integrated into a straight pipe shape by joining their ends together using a butt joint described later, and the third straight pipe section 16 is composed of the third straight pipe section division 17 and the third straight pipe section division 18.

[0026] In the first elbow pipe 11, a first bent section 20 is formed between the first straight pipe section 13 and the third straight pipe section division 17, and in the second elbow pipe 12, a second bent section 21 is formed between the second straight pipe section 15 and the third straight pipe section division 18. As described above, the first elbow pipe 11 consists of a first straight pipe section 13, a first bent section 20, and a third straight pipe section segment 17, and the second elbow pipe 12 consists of a second straight pipe section 15, a second bent section 21, and a third straight pipe section segment 18. Furthermore, in the bend joint 5, the bend pipe section 19 is composed of the first bent section 20, the third straight pipe section segment 17, the third straight pipe section segment 18, the second bent section 21, and the second straight pipe section 15. Furthermore, in the example shown in Figure 2, the intersection angle between the central axis of the first straight pipe section 13 and the central axis of the third straight pipe section 16, and the intersection angle between the central axis of the second straight pipe section 15 and the central axis of the third straight pipe section 16 are both set to 45°. Therefore, both the first elbow pipe 11 and the second elbow pipe 12 are types of 45° elbows.

[0027] In the first straight pipe section 13 of the first elbow pipe 11, a thin-walled section 13a having the same outer diameter and wall thickness as the first straight pipe 1 is formed on the side of the first straight pipe 1, and a thick-walled section 13b is formed on the side of the first bent section 20 in the first straight pipe section 13. The wall thickness of the first bent section 20 is formed to be slightly thicker than the thick-walled section 13b of the first straight pipe section 13. The wall thickness of the third straight pipe section division 17 is formed to be the same thickness as the thick-walled section 13b of the first straight pipe section 13. An inner curved surface 20b is formed on the inner surface side of the outer circumference 20a of the first bent portion 20, which is smoothly continuous with the inner circumference surface of the first straight pipe portion 13 and the inner circumference surface of the third straight pipe portion divided body 17. An inner circumference 20d, which is an extension of the inner surface of the first straight pipe portion 13, and an inner circumference 20e, which is an extension of the inner surface of the third straight pipe portion divided body 17 are formed on the inner surface side of the inner circumference 20c of the first bent portion 20, and a corner portion 20f is formed at the intersection of the inner circumference 20d and the inner circumference 20e.

[0028] The second elbow pipe 12 has the same shape as the first elbow pipe 11. In the second straight section 15 of the second elbow pipe 12, a thin-walled section 15a is formed on the side facing the second straight pipe 6, having the same outer diameter and wall thickness as the second straight pipe 6, while a thick-walled section 15b is formed on the side facing the first bent section 20 of the second straight section 15. The wall thickness of the second bent section 21 is formed to be slightly thicker than the thick-walled section 15b of the second straight section 15. The wall thickness of the third straight section division 18 is formed to be the same thickness as the thick-walled section 15b of the second straight section 15.

[0029] An inner curved surface 21b is formed on the inner surface side of the outer peripheral portion 21a of the second bent portion 21, which smoothly continues from the inner peripheral surface of the second straight pipe portion 15 and the inner peripheral surface of the third straight pipe portion divided body 18. An inner peripheral portion 21d, which is an extension of the inner surface of the second straight pipe portion 15, and an inner peripheral portion 21e, which is an extension of the inner surface of the third straight pipe portion divided body 18 are formed on the inner surface side of the inner peripheral portion 21c of the second bent portion 21, and a corner portion 21f is formed at the intersection of the inner peripheral portion 21d and the inner peripheral portion 21e.

[0030] The first elbow pipe 11 is integrated with the lower end of the first straight pipe 1 by butting the thin-walled portion 13a of the first straight pipe section 13 against the lower end of the first straight pipe 1 so that it is coaxial with the first straight pipe 1. The second elbow pipe 12 is integrated with the end of the second straight pipe 6 by butting the thin-walled portion 15a of the second straight pipe section 15 against the end of the second straight pipe 6 so that it is coaxial with the second straight pipe 6. Therefore, a fused portion (butt joint) 25 is formed at the joint between the first straight pipe 1 and the first elbow pipe 11, with an uneven portion 25a on its outer circumference consisting of beads resulting from the butt joint, and a fused portion (butt joint) 26 is also formed at the joint between the second straight pipe 6 and the second elbow pipe 12, with an uneven portion 26a on its outer circumference consisting of beads resulting from the butt joint.

[0031] The first elbow pipe 11 and the second elbow pipe 12 are integrated by butt-joining the third straight pipe section division 17 and the third straight pipe section division 18 so that they are coaxial. Therefore, a fused portion (butt joint portion) 27 is formed at the joint portion between the third straight pipe section division 17 and the third straight pipe section division 18, with an uneven portion 27a on its outer circumference consisting of beads resulting from the butt joint, and the third straight pipe section 16 is formed by integrating the third straight pipe section division 17 and the third straight pipe section division 18. The butt joint described above is a joining method in which the ends of two resin tubes to be joined are butted together coaxially, the butted ends of the tubes are heated and melted using a heater or the like, and then cooled while the ends are pressed together to fuse them together. Furthermore, any unevenness caused by the butt joint may be removed by cutting or other means to create a smooth outer surface of the joint.

[0032] As described above, the bend joint 5 connects the first straight pipe 1 and the second straight pipe 6, as shown in Figure 1, but a bend joint 7 is provided at the part where it connects to the vertical pipe 8. The bend joint 7 has the same structure as the bend joint 5, differing only in its mounting direction; all other components are the same as the bend joint 5. On the side where the bend joint 7 is installed, the second straight pipe 6 is joined to the horizontal pipe 9 via an EF joint 4, and the first straight pipe 1 is joined to the upper end of the vertical pipe 8 via an EF joint 4. The bend joint 7 is provided between the second straight pipe 6 and the first straight pipe 1.

[0033] Next, the siphon generation unit provided at the upper end of the first straight pipe 1 will be described. The siphon generation unit 2 is preferably a lid member positioned above the water collection port 31 so as to cover the opening of the water collection port 31, which is provided on the upper end side of the first straight pipe 1, as shown in Figure 3. The water collection port 31 is, for example, an opening on the structure of the rooftop floor of a building, and the upper end of the first straight pipe 1 is connected to the water collection port 31.

[0034] Examples of the lid members mentioned above include the siphon drain member 32 shown in Figure 3 and the siphon drain member 33 shown in Figure 4. As shown in Figure 3, the siphon drain member 32 comprises a mesh body 35 formed in the shape of a lid, a mounting cylinder 37 having a drain opening 36 and fitted into the receiving opening 1A of the first straight pipe 1, a plurality of vertical ribs 38 connecting the mesh body 35 and the mounting cylinder 37, arranged at circumferential intervals in a position that does not overlap the drain opening 36 when viewed from above, and a flange 39 that expands radially outward from the connection portion between the mesh body 35 and the mounting cylinder 37. The mesh body 35 is a debris shield to prevent debris from flowing into the water collection opening 31. The outer diameter of the mounting cylinder 37 is set to a diameter that can be fitted into the water collection opening 31. Male threads are formed on the outer circumferential surface of the mounting cylinder 37.

[0035] In the example where it is combined with the siphon drain member 32, the receiving opening 1A of the first straight pipe 1 is provided with a flange 40 that expands radially outward from the upper end of the receiving opening 1A, and a rib 41 that protrudes radially inward from the inner wall surface at a position that descends a predetermined height from the upper end of the receiving opening 1A along the axis J2 of the receiving opening 1A (i.e., advances a predetermined distance toward the curved pipe section not shown in Figure 3). The rib 41 is provided because reducing the inner diameter of the receiving opening 1A produces an effect similar to the Venturi effect, making it easier for a full flow state to occur and thus causing a siphon effect. Along the axis J2, the inner wall surface of the receiving opening 1A from the upper end to the rib 41 has an internal thread so that it can be screwed onto the mounting cylinder 37 of the siphon drain member 32.

[0036] The siphon drain member 32 is installed by screwing the male thread of the mounting cylinder 37 into the female thread of the receiving port 1A, and sandwiching the support plate 42 around the water collection port 31 between the flanges 39 and 40, and is also connected to the receiving port 1A.

[0037] As shown in Figure 4, the siphon drain member 33 comprises a plate-shaped lid 45, a plurality of vertical ribs 47 that form a drain opening 46 and are spaced apart along the outer circumference of the lid 45 at positions that do not overlap with the drain opening 46 in a top view, and that extend downward from the bottom surface of the lid 45 to support the lid 45, a guide portion 48 that hangs down from the bottom surface of the lid 45 and is formed radially in the radial direction in a top view, and a positioning rib 49 that is spaced apart along the outer circumference of the lid 45 and is provided to protrude upward from the top surface of the lid 45.

[0038] The lower end of the guide section 48 is formed to gradually approach the lid 45 as it moves outward from the radial center of the lid 45 in a side view, and has a tapered or bell-mouth shape. Such a lid 45 reduces the amount of air drawn into the first straight pipe 1, making it easier for a full flow state to occur and enabling the siphon effect to be generated.

[0039] The siphon drain member 33 is connected to the receiving port 1A of the first straight pipe 1 via a connecting member 50. The connecting member 50 comprises a cylindrical portion 51 that can be fitted into the receiving port 1A, and a flange 52 that expands in diameter from the upper end of the cylindrical portion 51. The cylindrical portion 51 of the connecting member 50 is inserted into the water collection port 31, and the bottom surface of the flange 52 is placed on and locked to the support plate 42 surrounding the water collection port 31.

[0040] The bottom surfaces of the multiple vertical ribs 47 of the siphon drain member 33 are machined to match the shape of the upper surface of the flange 52 of the connecting member 50. The multiple vertical ribs 47 and the flange 52, and the cylindrical portion 51 and the receiving opening 1A may be bonded together with an adhesive or the like, or they may be fused together. Also, similar to the above-described example using the siphon drain member 32 shown in Figure 3, male threads may be formed on the outer circumference of the cylindrical portion 51 and female threads may be formed on the inner circumference of the receiving opening 1A, so that the cylindrical portion 51 and the receiving opening 1A are screwed together.

[0041] According to the configuration shown in Figure 3 or Figure 4, the siphon generating unit 2 is exemplified by the siphon drain members 32 and 33. Since the receiving port 1A of the first straight pipe 1 is connected to the water collection port 31, the rainwater collected at the water collection port 31 is guided to the outlets 36 and 46 through the gap between the support plate 42 and the mesh body 35 or lid 45, and between the multiple vertical ribs 38 and 47, and flows into the first straight pipe 1 in a full state, thereby generating a siphon phenomenon effectively.

[0042] Rainwater that flows into the first straight pipe 1 when it is full flows through the inside of the bend joint 5 and reaches the second straight pipe 6. In this configuration, the bend joint 5 basically consists of a first elbow pipe 11 and a second elbow pipe 12 which are 45° bends. Therefore, there is no section where the flow of drainage changes sharply from the first straight pipe 1 to the bend joint 5, and the water flows smoothly, allowing the drainage to flow to the second straight pipe 6 side while maintaining a full state of water.

[0043] In this embodiment of the bend joint 5, the first straight pipe section 13 of the first elbow pipe 11 is butt-jointed to the first straight pipe 1, so the fused portion 25 has some irregularities due to the bead. However, since these irregularities are located in the first straight pipe section 13, they have little effect on the flow of wastewater and do not pose a risk of adversely affecting the full-water state necessary for the siphon effect to occur. Furthermore, since the fused portion 27 is provided in the third straight pipe section 16 and the fused portion 26 is provided in the second straight pipe section 15, and both are located in straight pipe sections, there is no risk of the irregularities present in these fused portions adversely affecting the full-water state. Therefore, the wastewater flowing through the bend joint 5 reaches the second straight pipe 6 while maintaining a full-water state.

[0044] The wastewater that has passed through the second straight pipe 6 in a full state then reaches the bend joint 7. Since the bend joint 7 has the same structure as the bend joint 5, the wastewater flowing through the bend joint 7 reaches the vertical pipe 8 while maintaining a full state. Thus, the rainwater drainage device 10 in this configuration can maintain the full water state generated in the siphon generation unit 2 while sending the drained water in the order of the first straight pipe 1, bend joint 5, second straight pipe (horizontal pipe) 6, bend joint 7, and vertical pipe 8, enabling efficient drainage using the siphon phenomenon.

[0045] Furthermore, if the first straight pipe 1, the bend joint 5, the second straight pipe 6, the bend joint 7, and the vertical pipe 8 are all made of olefin resin, then a rainwater drainage system 10 can be provided that is less susceptible to damage even when subjected to vibrations such as earthquakes, because it is more resistant to vibrations and impacts than PVC pipes, etc. Olefin-based resin pipes have a higher tensile elongation at break compared to rigid polyvinyl chloride pipes, as measured according to JIS K 6815-1 and JIS K 6815-3. While the tensile elongation at break of rigid polyvinyl chloride pipes is 50-150%, that of olefin-based resin pipes is 350% or more. In particular, when using high-density polyethylene pipes of PE100 using the extrapolation method specified in ISO / TR9080, the tensile elongation at break exceeds 500%, making them less susceptible to damage from seismic vibrations.

[0046] In particular, for rainwater drainage pipes, it is important that they can drain efficiently during heavy rain and are resistant to damage even when subjected to vibrations such as earthquakes, thus providing a highly safe rainwater drainage system 10. In buildings such as condominiums and office buildings, it is not possible to stop rainwater drainage even during earthquakes, so providing an earthquake-resistant rainwater drainage system 10 is especially beneficial.

[0047] The bend joints 5 and 7 in this embodiment are constructed by butt-joining a first elbow pipe 11 and a second elbow pipe 12, but the first elbow pipe 11 and the second elbow pipe 12 can be manufactured individually by injection molding. For this reason, the first elbow pipe 11 and the second elbow pipe 12 have a high degree of design freedom in terms of shape and are easy to manufacture. Furthermore, even when the first elbow pipe 11 and the second elbow pipe 12 are combined as in this embodiment, the fit is superior to conventional bends, which have many constraints associated with bending.

[0048] Furthermore, since the bend joint 5 has gently curved inner surfaces 20b and 21b on the outer circumference side where the drainage flow is faster, drainage can flow smoothly while maintaining a full water level. On the other hand, although the inner circumference side of the bend joint 5 has corners 20f and 21f, the bending angle of the drainage when passing through the corners 20f and 21f is 45°, which is small, so drainage can flow smoothly while maintaining a full water level even on the inner circumference side of the bend joint 5.

[0049] "Drainage piping system" Figure 5 shows one form of a drainage piping system 10S in which the rainwater drainage device 10 shown in Figure 1 is applied to multiple roof drain sections RD installed on the roof of a building 60 such as an apartment building or office building. The building 60 shown in Figure 5 is a three-story building with slabs 61 provided between the first and second floors, and between the second and third floors, and the exterior walls are formed by side walls 62, 63, 64, and 65. Six roof drain sections RD are installed at predetermined intervals, three at each corner of the slab on the rooftop floor (not shown in the diagram).

[0050] In each roof drain section RD, a first straight pipe 1 is provided, and a second straight pipe 6 is connected to the lower end of the first straight pipe 1 via a bend joint 5, and the second straight pipe 6 is individually connected to a water collection pipe 66. Two water collection pipes 66 are provided in the building 60. One water collection pipe 66 extends along the front side wall 62 of the building 60, and the other water collection pipe 66 extends along the opposite rear side wall 64.

[0051] As shown in Figure 5, the water collection pipe 66 extends to the vicinity of the other side wall 63 adjacent to the front side wall 62 and the rear side wall 64, and is connected to a vertical pipe 67 erected vertically along the other side wall 63. A bend joint 7 with the structure shown in Figure 1 is applied to the connection between the water collection pipe 66 and the vertical pipe 67. The lower end of the vertical pipe 67 extends to the bottom of the side wall 63 and is connected to the horizontal drain main pipe 68. A bend joint 5, with the structure shown in Figure 1, is applied to the connection between the lower end of the vertical pipe 67 and the horizontal drain main pipe 68. Similar to the structure illustrated in Figure 1, EF joints are provided at the joints between the upstream and downstream straight pipes of the bend joint 5, and EF joints are also provided at the joints between the upstream and downstream straight pipes of the bend joint 7. However, these EF joints are omitted from the description in Figure 5.

[0052] In the drainage piping system 10S applied to the building 60 shown in Figure 5, three first straight pipes 1 are connected to one water collection pipe 66, and rainwater can be flowed from three siphon generating units 2 into the three first straight pipes 1 in a full-water state. Furthermore, a bend joint 7 is applied to the section where the water collection pipe 66 is connected to the vertical pipe 67, and a bend joint 5 is applied to the section where the vertical pipe 67 is connected to the horizontal drainage main pipe 68. As a result, rainwater that flows through the water collection pipe 66 when it is full is also drained through the vertical pipe 67 and the horizontal drainage main pipe 68 while maintaining a full state.

[0053] Therefore, in building 60, the drainage route connecting the roof drain section RD to the first straight pipe 1, bend joint 5, second straight pipe 6, water collection pipe 66, bend joint 7, vertical pipe 67, bend joint 5, and main horizontal drainage pipe 68 can all be drained while full, allowing for efficient drainage. As a result, even if a large amount of rainwater falls on building 60 during heavy rain, efficient drainage can be achieved by utilizing the aforementioned drainage route.

[0054] Furthermore, since rainwater can be flowed in a full state using the siphon effect in the drainage path from the roof drain section RD through the first straight pipe 1 to the horizontal drainage main pipe 68, the water flow rate that can be flowed through one collection pipe 66 and one vertical pipe 67 can be set to be large. For this reason, compared to the conventional structure in which one collection pipe and one vertical pipe were connected to one roof drain section RD, there is an effect of reducing the number of collection pipes 66 and vertical pipes 67 installed in the building 60. For example, in the building 60 shown in Figure 5, six roof drain sections RD are provided. In a conventional structure, six water collection pipes and six vertical pipes would be required. However, by adopting this structure, it is possible to accommodate this by providing two water collection pipes 66 and two vertical pipes 67. Therefore, four water collection pipes and four vertical pipes can be omitted.

[0055] In the drainage piping system 10S shown in Figure 5, the rooftop portion of the building 60 is heated to high temperatures during the daytime, such as in summer, and cooled at night. As a result, considerable stress is applied to the first straight pipe 1, the second straight pipe 6, and the water collection pipe 66 due to thermal contraction. In this regard, in the bend joints 5 and 7, the fusion joint 25 with the first straight pipe 1, the fusion joint 26 with the second straight pipe 6, and the fusion joint 27 of the divided third straight pipe section 17 and 18 are all located on the straight pipe section. Therefore, these fusion joints are less susceptible to damage from the stress caused by thermal contraction compared to structures where the fusion joint is located on the curved part of the joint. Thus, the bend joints 5 and 7 have excellent durability when applied to piping on the rooftop floors of buildings that are subjected to repeated thermal stress.

[0056] Figure 6 shows an example of a structure in which a bend joint 5 and a second straight pipe 6 are provided at the lower end of the vertical pipe 67 where it connects to the horizontal drainage main pipe 68, and the horizontal drainage main pipe 68 is connected to the second straight pipe 6 via an EF joint 4 and an enlarged diameter joint 69. After connecting the second straight pipe 6 to the bend joint 5, other piping, such as the horizontal drainage main pipe 68, can be connected to the second straight pipe 6 via the EF joint 4, the straight pipe 58, and the diameter expansion joint 69.

[0057] As explained earlier, the EF joint 4 has a straight pipe body that can be attached to the pipes to be joined, and is a joint in which the straight pipes are fused together by heat generation. As explained above, the bend fittings 5 ​​and 7 in this configuration may be used in combination with other fittings, such as the EF fitting 4, to connect piping as needed. Since pipes and fittings made of olefin resin cannot be bonded, they can be joined using EF fittings. In this embodiment, the bend fittings 5 ​​and 7 are fusion-bonded to the straight pipe by butt joints, but for joining other straight pipes to the second straight pipe 6, other general fittings such as EF fittings can be applied as needed.

[0058] Figure 7 shows a second embodiment of the bend joint according to the present invention. The bend joint 70 of this second embodiment also employs the same basic structure as the bend joint 5 shown in Figure 2, but it shows an example of application when the inner and outer diameters of the connecting first straight pipe 71 and second straight pipe 76 are smaller than the inner and outer diameters of the first straight pipe 1 and second straight pipe 6 shown in Figure 2. The bend joint 70 is equivalent in that it is composed of a first elbow pipe 11 and a second elbow pipe 12, the first elbow pipe 11 is composed of a first straight pipe section 13, a first bent section 20 and a third straight pipe section segment 17, and the second elbow pipe 12 is composed of a second straight pipe section 15, a second bent section 21 and a third straight pipe section segment 18. The first elbow pipe 11 is butt-jointed to the first straight pipe 71, the second elbow pipe 12 is butt-jointed to the second straight pipe 76, and the third straight pipe section segment 17 of the first elbow pipe 11 and the third straight pipe section segment 18 of the second elbow pipe 12 are butt-jointed. For other equivalent structural parts, the same reference numerals are used, and detailed explanations are omitted.

[0059] In the structure shown in Figure 7, the length of the first straight pipe section 13, the lengths of the third straight pipe section divisions 17 and 18, and the length of the second straight pipe section 15 are all longer than in the structure shown in Figure 1. This structure allows the bend joint 70 to accommodate even if the inner and outer diameters of the first straight pipe 71 and the second straight pipe 76 become smaller. If the inner and outer diameters of the first straight pipe 71 and the second straight pipe 76 are reduced, and the lengths of the first straight pipe section 13, the third straight pipe section divisions 17 and 18, and the second straight pipe section 15 are set to the same lengths as shown in Figure 2, the drainage flow will change direction at a sharp angle over a short distance within the bend joint.

[0060] When the inner and outer diameters of the first straight pipe 71 and the second straight pipe 76 are reduced, by setting the lengths of the third straight pipe section divisions 17 and 18 to be longer than the structure shown in Figure 1, the position where the water flow is changed by 45° can be spaced apart by the length of the third straight pipe section divisions 17 and 18. This creates a smoother flow, allowing wastewater to flow while maintaining a full water state at the bend joint 70. Therefore, even with the connection between the small-diameter first straight pipe 71 and the second straight pipe 76 as shown in the structure of Figure 7, the use of the bend joint 70 makes it possible to create a drainage flow that does not obstruct the siphon effect. In the embodiments described so far, the first straight pipe 1 and the second straight pipe 6 were applied to a structure in which they intersect at a 90° angle. However, it goes without saying that the embodiments can also be applied to cases where the first straight pipe 1 and the second straight pipe 6 intersect at angles other than 90°. Furthermore, the intersection angles of the axis of the first straight pipe section 13 and the axis of the third straight pipe section 16, and the intersection angles of the axis of the second straight pipe section 15 and the axis of the third straight pipe section 16, do not need to be the same; they may be different angles.

[0061] Figure 8 compares the conventional bending process bend 100 with the shape shown in Figure 11, the bend joint 5 of the embodiment shown in Figure 2, and the conventional EF joint 180, showing the relationship of their respective fitting dimensions. Since all of these bends are 90° bends, when each bend or joint is placed horizontally and viewed from above, a corner section C is defined by imaginary lines A and B that intersect at a 90° angle inside them. The dimensions of the fittings were compared when corner section C abuts against the inside of the longitudinal center of each bend, and both ends of each joint are installed parallel to imaginary lines A and B. The fitting dimensions here refer to the maximum dimensions (mm) of each joint that are spaced perpendicular to the virtual line A, from a portion of the virtual line A.

[0062] The bending process bend 100 is manufactured by heating and softening a straight pipe and then fitting it into a mold; therefore, it is basically an arc-shaped bend. Thus, we assume that the bending process bend 100 fits in such a way that its inner circumference is in contact with the corner C. The EF fitting 180 has a shape in which two cylindrical sections 185, each large enough to surround the pipe to be connected, are joined together, and since it is equipped with an electric heating element inside, the wall thickness of the cylindrical section 185 becomes considerably larger due to the inclusion of the electric heating element. In this comparison, we assume that the fitting is such that the inner central part of a 45° elbow type EF fitting (a type in which two EF fittings are joined together) is positioned in contact with the corner section C.

[0063] For pipes with inner diameters of 50mm, 65mm, 75mm, 100mm, 125mm, and 150mm, the fitting dimensions M were measured for the corresponding sizes of bent pipes, the bend fittings of this form, and 45°EF fittings (Sekisui Chemical Co., Ltd.'s "EF45° Elbow," inner diameter 50: KE4L50, inner diameter 75: HE4L75, inner diameter 100: HE4L1H). The results are summarized in Table 1 below.

[0064] [Table 1]

[0065] A comparison of this bend joint with an EF joint (using two) and a 90-degree bend revealed that this bend joint provides the best fit.

[0066] By the way, in the explanation so far, we have described an example in which this embodiment is applied to a roof drain section RD installed on the rooftop floor of a building. However, since roof drains are also installed on balcony floors, veranda floors, terrace floors, etc., this embodiment may also be applied to roof drain sections installed on balcony floors, veranda floors, terrace floors, etc. Furthermore, the bend joints 5 and 7 can, of course, be applied not only to the connection between vertical and horizontal pipes, but also to the connection between horizontal pipes where a 90° bend occurs.

[0067] Figure 9 shows an example of a structure in which a pipe 80 with an EF socket is bent and joined to a bend joint 5 having a first straight pipe 1 and a second straight pipe 6 as shown in Figure 2. A pipe 80 with an EF socket is bent and joined to the tip of the first straight pipe 1 via a butt joint 82, and a pipe 80 with an EF socket is bent and joined to the tip of the second straight pipe 6 via a butt joint 83.

[0068] The EF receiving pipe 80 has a neck portion 85 butted to the tip of the first straight pipe 1 or the second straight pipe 6, and an enlarged diameter portion 86 extending toward the tip of the neck portion 85, with an electric heating wire 87 spirally arranged on the inner circumference of the enlarged diameter portion 86. A receiving portion 88 for inserting the end of another pipe is formed on the inner circumference of the enlarged diameter portion 86. A cable connector 80a with a structure equivalent to the cable connector 4a provided on the EF joint 4 described earlier is formed on the outer circumference of the enlarged diameter portion 86. In the EF receiving pipe 80, both the neck portion 85 and the enlarged diameter portion 86 are made of the aforementioned olefin resin.

[0069] In the EF-receptacle-equipped pipe 80, the cable connectors 80a, 80a are connected to a fusion splicer (not shown) and power is supplied to heat the heating element 87, thereby fusion-connecting the piping inserted into the receptacle portion 88. The EF joint is the portion where a straight pipe is inserted into the enlarged diameter section 86 of the EF receiving pipe 80 and fused together.

[0070] Figure 10 shows an example of a housing joint that can be used in combination with the bend joints 5 and 7, the first straight pipe 1, the second straight pipe 6, and the EF joint 4 of the configurations described above. In Figure 10, in the first main pipe 91 and the second main pipe 92 to be connected, a portion of the receiving pipe 93 is inserted into the end of the first main pipe 91, and a portion of the receiving pipe 95 is inserted into the end of the second main pipe 92. In the receiving pipe 93, an enlarged diameter portion 93a is formed on the tip portion that protrudes from the tip of the first main pipe 91, and in the receiving pipe 95, an enlarged diameter portion 95a is formed on the tip portion that protrudes from the tip of the second main pipe 92.

[0071] As shown in Figure 10, the main pipes are aligned in a straight line with the right end of the first main pipe 91 and the left end of the second main pipe 92 facing each other, so that the enlarged diameter sections 93a and 95a face each other, and a ring member 96 made of an elastic material is positioned to cover these enlarged diameter sections 93a and 95a. A housing member 97 is provided, which is formed by combining split ring members so as to cover the outer circumference of the ring member 96, and bolts 98 and nuts 99 are provided for fastening the split ring members together. A flange portion 94 is formed to protrude from one end of each split ring, and a bolt 98 is installed so as to pass through these flanges, with a nut 99 screwed onto the bolt 98. By screwing a nut 99 onto a bolt 98 and tightening the flange portions 94 of the split ring member together, the enlarged diameter portions 93a and 95a are fastened together via the ring member 96, forming the housing joint HG.

[0072] In the connection structure shown in Figure 10, a straight pipe 111 is joined to the left end of the first main pipe 91 via a butt joint 110, and a straight pipe 113 is joined to the right end of the second main pipe 92 via a butt joint 112.

[0073] By adopting the structure shown in Figure 10, the first main pipe 91 and the second main pipe 92 can be joined together without any problems, even if both are pipe bodies made of olefin resin. Since it is difficult to join tubes made of olefin resin by adhesive, they can be joined using EF joining or butt joining as in the embodiment described above. In contrast, the structure shown in Figure 10 can be used as a substitute for a butt joint or an EF joint in the piping structures shown in Figures 1 and 6. Alternatively, some of the multiple EF joints or butt joints in these configurations may be replaced with the structure in Figure 10. By adopting the connection structure shown in Figure 10, the first main pipe 91 and the second main pipe 92, both made of olefin resin, can be connected by tightening bolts and nuts.

[0074] As shown in Figure 6, the bend joint 5 can also be installed below the slab 61. However, it can also be installed not only below the slab 61, but also before and after walls such as the side walls 62-65. Furthermore, when installed below the slab 61 or before and after the wall, configurations such as those shown in Figures 13 and 14 can be suitably adopted. In the configurations shown in Figures 13 and 14, the bend joint 5 connects the vertical pipe 67 and the horizontal drainage main pipe 68, but the objects to which the bend joint 5 connects are not limited to these. In the first example shown in Figure 13, the vertical pipe 67 penetrates the slab 61, and the lower end of the vertical pipe 67 is located below the slab 61. The lower end of the vertical pipe 67 and the first straight pipe 1 are joined below the slab 61 via an EF joint 4. The second straight pipe 6 and the drain horizontal main pipe 68 are joined via an EF joint 4. The second straight pipe 6 is supported by a bracing support 120. The bracing support 120 is formed, for example, from structural steel. The bracing support 120 is fixed to the lower surface of the slab 61. The bracing support 120 extends downward from the slab 61. In the first example, the first straight pipe 1 and the second straight pipe 6 are of roughly equal length. On the other hand, the second example shown in Figure 14 is similar in many ways to the first example, but the position of the lower end of the vertical pipe 67 is different. In the second example, the lower end of the vertical pipe 67 is located above the slab 61. The first straight pipe 1 penetrates the slab 61. The upper end of the first straight pipe 1 is located above the slab 61. In the second example, the first straight pipe 1 is longer than the second straight pipe 6. If it is anticipated that the first straight pipe 1 will penetrate the slab 61, it is preferable that the length of the first straight pipe 1 be longer than the slab 61 in question. The thickness of the slab 61 is generally 100 to 200 mm, and the length of the first straight pipe 1 is 200 mm or more, preferably 250 mm or more. In the second example, compared to the first example, the fitting dimension M is smaller because the vertical pipe 67 and the first straight pipe 1 are not joined under the slab 61. Furthermore, in the case where the first straight pipe 1 penetrates the slab 61, as in the second example, it is preferable to wrap the portion of the first straight pipe 1 that is placed inside the slab 61 with a heat-expandable fire-resistant sheet. Such a fire-resistant sheet may be wrapped during the product distribution stage or it may be wrapped at the construction site. Furthermore, even when the first straight pipe 1 is placed inside the slab 61, as in the second example, it is preferable that the fusion portion 25 be placed outside the slab 61. In this second example, the first straight pipe 1 is placed inside the slab 61, but the second straight pipe 6 may also be placed inside the slab 61. In this case, the second straight pipe 6 may be longer than the first straight pipe 1, and it is preferable that the fire-resistant sheet is wrapped around the second straight pipe 6. Furthermore, the first straight pipe 1 and the second straight pipe 6 may penetrate a wall instead of the slab 61. [Explanation of Symbols]

[0075] RD...Roof drain section, 10S…Drainage piping system, 1...first straight pipe, 2...Siphon generation section, 4...EF joint, 4A...EF junction, 5...Bend joint, 6...Second straight pipe, 10...Rainwater drainage system, 13...first straight pipe section, 15...Second straight pipe section, 16...Third straight pipe section, 17, 18...Third straight pipe segment, 19...Bend section, 20...first bending part, 21...Second bending part, 25, 26, 27...Fused joint (butt joint), 32, 33... Siphon drain components, 66...Water collection pipe, 67...Vertical pipe, 68...Drainage horizontal main pipe, 69... Enlarged diameter joint, 70... Bend joint, HG...Housing joint.

Claims

1. Siphon generation section, A vertical pipe connected to the downstream side of the siphon generation unit, The system comprises a horizontal main pipe connected to the lower end of the vertical pipe via a connecting part, The connecting section comprises a first straight pipe section, a second straight pipe section, and a bent pipe section connecting the first straight pipe section and the second straight pipe section. A third straight pipe section is formed in the middle of the aforementioned bent pipe section. The angle of intersection between the axis of the first straight pipe section and the axis of the third straight pipe section, and the angle of intersection between the axis of the second straight pipe section and the axis of the third straight pipe section are both 45° or less, The aforementioned connection part is A first straight pipe connected to one end of the first straight pipe section, It has a second straight pipe connected to one end of the second straight pipe section, The first straight pipe or the second straight pipe penetrates the slab or wall, The first straight pipe or the second straight pipe has a portion that penetrates the slab or the wall, which is made of a heat-expandable fire-resistant material. Drainage piping system.

2. An enlarged diameter section is formed in the aforementioned horizontal main pipe. The drainage piping system according to claim 1.

3. Of the first and second straight pipes, the straight pipe that penetrates the slab or the wall is formed to be longer than the straight pipe that does not penetrate. The drainage piping system according to claim 1.

4. The aforementioned connecting portion is provided below the slab. The drainage piping system according to claim 1.

5. A building comprising a drainage piping system according to any one of claims 1 to 4.

Images