Stormwater drainage piping structure and buildings

Abstract

To provide a rainwater drain pipe structure capable of stably merging of drainage from a branch pipe to a main pipe at a confluence part when applying the siphon phenomenon to drain rainwater.SOLUTION: A rainwater drain pipe structure 100 includes: a siphon type drainage member placed on the upper floors; a main pipe 122 for allowing rainwater flowing in from the siphon type drainage member to flow down from the upper floors to the lower floors; and a branch pipe 150 connected to a confluence part 120T that is located in the middle of the height direction of the main pipe 122 for allowing drain water to flow into the confluence part 120T from outside. The main pipe 122 includes: a first vertical pipe 123 placed at the upper side; and a curing tube 125 placed at the lower side of the first vertical pipe 123, which has a flow passage area larger than that of the first vertical pipe 123.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a rainwater drainage piping structure that is arranged in a building to drain rainwater from upper floors to lower floors. [Background technology]

[0002] As is well known, in large buildings such as factories and shopping centers, as buildings become more multi-purpose and complex, technology is becoming more widespread in which siphon-type drainage components are placed on roofs, balconies, etc. to efficiently drain rainwater from the upper floors to the floors below.

[0003] A rainwater piping main system using a siphon-type drainage member creates a siphon effect inside the pipe for rainwater flowing in through the siphon-type drainage member, which creates a full pipe flow due to the siphon effect, improving drainage capacity (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-007250 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a rainwater piping system that uses the siphon effect, the pressure inside the main pipe is negative on the upper floors, but increases as you get closer to the lower floors, and on the lower floors, the pressure inside the pipe rises to positive, making it increasingly difficult to merge the drainage from the branch pipes into the main pipe. In particular, if an elbow is installed at the bottom floor of the main pipe to change the direction of the drainage flow to the lateral (horizontal) direction, the pressure inside the pipe on the lower floors tends to rise significantly when the elbow receives the drainage. As a result, the locations where the wastewater can be merged into the main pipe are limited, and merging on lower floors where the pressure inside the pipe becomes positive is not possible.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a rainwater drainage piping structure that, when using the siphon effect to drain rainwater from upper floors to lower floors, can stably merge drainage water from a branch pipe into a main pipe at a junction located on an intermediate floor. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following means. The invention described in claim 1 is a rainwater drainage piping structure that is arranged in a building and drains rainwater from upper floors to lower floors, comprising a siphon-type drainage member arranged on an upper floor, a main pipe through which rainwater flowing in from the siphon-type drainage member flows from the upper floor to the lower floor, and a branch pipe connected to a junction located midway in the height direction of the main pipe and through which drainage water from the outside flows into the junction, wherein the main pipe comprises a first vertical pipe arranged on the upper side and connected to the siphon-type drainage member, and a second vertical pipe arranged below the first vertical pipe and having a larger flow path area than the first vertical pipe.

[0008] According to the rainwater drainage piping structure of the present invention, the structure comprises a siphon-type drainage member arranged on an upper floor, a main pipe through which rainwater flowing in from the siphon-type drainage member flows down from the upper floor to the lower floor, and a branch pipe connected to a junction located midway in the height direction of the main pipe and through which wastewater flows into the junction from the outside. The main pipe comprises a first vertical pipe arranged on the upper side and connected to the siphon-type drainage member, and a second vertical pipe arranged below the first vertical pipe and having a larger flow path area than the first vertical pipe. Therefore, when rainwater is drained from the upper floor to the lower floor by applying the siphon effect, the wastewater can be stably merged from the branch pipe into the main pipe at the junction located on the middle floor. As a result, branch pipes can be connected to the main pipe at lower levels in a building or on lower floors.

[0009] The invention described in claim 2 is a rainwater drainage piping structure described in claim 1, characterized in that the confluence is formed in the first vertical pipe, and the second vertical pipe is a curing pipe located below the confluence and arranged at a distance from the outer wall portion of the first vertical pipe.

[0010] According to the rainwater drainage piping structure of the present invention, the confluence is formed in the first vertical pipe, and the second vertical pipe is a protective pipe located below the confluence and arranged at a distance between it and the outer wall portion of the first vertical pipe, so that the first vertical pipe and the second vertical pipe can be connected with a simple structure.

[0011] The invention described in claim 3 is a rainwater drainage piping structure described in claim 1, characterized in that the confluence is formed in the first vertical pipe, and the second vertical pipe is connected to the first vertical pipe via an increaser arranged below the confluence.

[0012] According to the storm water drainage piping structure of the present invention, a confluence is formed in the first vertical pipe, and the second vertical pipe is connected to the first vertical pipe via an increaser arranged below the confluence, so that the internal pressure at the confluence becomes negative, and the drainage can be stably confluent from the branch pipe to the main pipe.

[0013] The invention described in claim 4 is a rainwater drainage piping structure described in claim 1, characterized in that the confluence is formed in the second vertical pipe, and the second vertical pipe is connected to the first vertical pipe via an increaser arranged above the confluence.

[0014] According to the rainwater drainage piping structure of the present invention, the confluence is formed in the second vertical pipe, and the second vertical pipe is connected to the first vertical pipe via an increaser arranged above the confluence, so that the internal pressure at the confluence becomes negative, and the wastewater can be stably merged from the branch pipe to the main pipe. Also, since the flow area in the main pipe is already large at the confluence, the flow rate of the wastewater merging at the confluence can be increased.

[0015] The invention described in claim 5 is a rainwater drainage piping structure described in any one of claims 1 to 4, characterized in that the nominal diameter of the second vertical pipe is set to be at least one size larger than the nominal diameter of the first vertical pipe.

[0016] According to the rainwater drainage piping structure of the present invention, the nominal diameter of the second vertical pipe is set to be at least one size larger than the nominal diameter of the first vertical pipe, so that the drainage water from the branch pipes can be efficiently merged at the junction.

[0017] The invention described in claim 6 is the rainwater drainage piping structure described in any one of claims 1 to 5, characterized in that the junction is disposed 10 m or less from the ground surface.

[0018] According to the rainwater drainage piping structure of the present invention, the confluence is located 10 m or less from the ground surface, so that the confluence can be located at a low position in the building. As a result, the degree of freedom in designing the storm water drainage piping structure can be improved.

[0019] The invention described in claim 7 is the rainwater drainage piping structure described in any one of claims 1 to 5, characterized in that the junction is disposed on the third floor or lower.

[0020] According to the rainwater drainage piping structure of the present invention, the junction is disposed on the third floor or lower, so that the junction can be disposed at a low position in the building. As a result, the degree of freedom in designing the storm water drainage piping structure can be improved. Effect of the Invention

[0021] According to the rainwater drainage piping structure of the present invention, when rainwater is drained from upper floors to lower floors by applying the siphon effect, the drainage can be stably merged from the branch pipe into the main pipe at a junction provided on an intermediate floor. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a conceptual diagram illustrating an example of a schematic configuration of a storm water drainage system according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view illustrating an example of a schematic configuration of a siphon-type drainage member applied to the rainwater drainage system according to the first embodiment. [Diagram 3] FIG. 2 is a side view illustrating an example of a schematic configuration of a siphon-type drainage member applied to the rainwater drainage system according to the first embodiment. [Figure 4] FIG. 1 is a schematic configuration diagram illustrating a storm water drainage system according to a first embodiment. [Diagram 5] FIG. 5 is a schematic diagram illustrating the schematic configuration of a storm water drainage system according to a second embodiment of the present invention. [Figure 6] FIG. 11 is a schematic diagram illustrating the schematic configuration of a storm water drainage system according to a third embodiment of the present invention. [Figure 7] FIG. 11 is a conceptual diagram illustrating an example of a schematic configuration of a storm water drainage system according to a fourth embodiment of the present invention. [Figure 8] FIG. 13 is a vertical cross-sectional view illustrating an example of a schematic configuration of a siphon-type drainage member applied to a rainwater drainage system according to a fourth embodiment. [Figure 9] FIG. 13 is a perspective view illustrating an example of a schematic configuration of a siphon-type drainage member applied to a rainwater drainage system according to a fourth embodiment. [Figure 10] FIG. 1 is a conceptual diagram illustrating a schematic configuration of a storm water drainage system used in an embodiment of the present invention. [Figure 11] FIG. 2 is a conceptual diagram illustrating a specific configuration of a storm water drainage system in an embodiment. [Figure 12] FIG. 2 is a pressure distribution diagram illustrating the internal pressure of the main pipe of the storm water drainage system related to Verification Test 1 in the examples. [Figure 13] FIG. 13 is a diagram illustrating the confluence flow rate of a branch pipe of a storm water drainage system in accordance with Verification Test 2 in the Examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] First Embodiment Hereinafter, a rainwater drainage system (rainwater drainage piping structure) according to a first embodiment will be described with reference to Figs. 1 to 4. Fig. 1 is a conceptual diagram for explaining an example of the schematic configuration of the storm water drainage system according to the first embodiment. Fig. 2 is a vertical cross-sectional view for explaining an example of the schematic configuration of a siphon-type drainage member applied to the storm water drainage system according to the first embodiment, and Fig. 3 is a perspective view. Fig. 4 is a schematic diagram for explaining the schematic configuration of the storm water drainage system according to the first embodiment.

[0024] In Figures 1 to 4, reference numeral 10 indicates a building, reference numeral 100 indicates a rainwater drainage system (rainwater drainage piping structure), reference numeral 20 indicates a siphon-type drainage member, reference numeral 120 indicates the rainwater piping body, reference numeral 121 indicates a horizontal pipe, reference numeral 122 indicates a main pipe, reference numeral 123 indicates a first vertical pipe, reference numeral 125 indicates a protective pipe (second vertical pipe), and reference numeral 150 indicates a branch pipe.

[0025] As shown in FIG. 1, a storm water drainage system (storm water drainage piping structure) 100 is applied to, for example, an eight-story building 10 (for example, 24 m high). The building 10 may be, for example, a factory or shopping center that is 20 m or more in height, a warehouse, a large parking lot, or the like.

[0026] The rainwater drainage system 100 further includes, for example, a siphon-type drainage member 20, a rainwater piping main body 120 that drains rainwater flowing in from the siphon-type drainage member 20 toward the lower floors, and a branch pipe 150 connected to the rainwater piping main body 120 at a junction 120T on an intermediate floor. The storm water drainage system 100 is configured to drain the drainage water flowing down from the upper floors and the drainage water combined with the branch pipe 150 into a storm water inlet 160 buried underground. The rainwater that flows into the rainwater inlet 160 is discharged outside the system via a pipe 161.

[0027] As shown in FIG. 1, a siphon-type drainage member 20 (drainage member) is provided inside a large rain gutter 11 arranged at the eaves of the roof of a building 10. The gutter 11 receives and drains rainwater that flows down from the eaves of the roof. The gutter 11 is an extrusion molded product of synthetic resin such as rigid polyvinyl chloride resin, ABS, or AES. The gutter 11 is formed with a groove-shaped cross section in which a front wall 11B stands upright from the front end of a flat bottom wall 11A, and a rear wall 11C stands upright from the rear end of the bottom wall 11A. The gutter 11 is suspended, for example, by a gutter hanger (not shown) attached to a fascia board (not shown).

[0028] The siphon-type drainage member 20 shown in Fig. 2 is a drainage member having a high drainage function for improving the drainage capacity of rainwater that flows into the rain gutter 11 during heavy rain. The siphon-type drainage member 20 is an injection-molded product made of synthetic resin such as hard polyvinyl chloride resin, polycarbonate, ABS, AES, etc. Note that the material is not limited to synthetic resin, and it may be made of cast iron using a mold.

[0029] The siphon-type drainage member 20 comprises a plate-shaped cover member 21, an attachment tube 22 whose upper end portion has a drop opening portion 22a inside, and a plurality of vertical ribs 23 which connect the cover member 21 and the attachment tube 22 and are arranged at intervals circumferentially in positions that do not overlap the drop opening portion 22a when viewed from above.

[0030] The mounting tube 22 penetrates the bottom wall 11A of the rain gutter 11 in the vertical direction. A flange 22D is provided at the upper end of the mounting tube 22. The flange 22D is disposed on the upper surface of the bottom wall 11A and is supported from below by the bottom wall 11A. The portion formed between the outer periphery of the cover member 21 and the outer periphery of the flange 22D becomes an inflow opening 20A that allows rainwater accumulated in the rain gutter 11 to flow into the opening of the downhole portion 22a.

[0031] The vertical ribs 23 connect the flange 22D of the mounting tube 22 to the outer periphery of the cover member 21. The vertical ribs 23 straighten the rainwater flowing from the inlet opening 20A to the drop opening 22a. The lid member 21 is supported by the mounting tube 22 via a plurality of vertical ribs 23. The lid member 21 is disposed inside the rain gutter 11, and is installed at a position spaced upward from the drop opening portion 22a.

[0032] In addition, the siphon-type drainage member 20 suppresses the formation of an air column near the center of the rainwater (drainage) that flows into the downflow opening portion 22a due to the siphon phenomenon, thereby allowing the rainwater to flow efficiently toward the floor below. The configuration of the siphon-type drainage member 20 is merely an example, and the configuration can be set arbitrarily.

[0033] 3, an elbow 121L is installed on the downstream side of the siphon-type drainage member 20. The elbow 121L connects the siphon-type drainage member 20 and the rainwater piping main body 120 (horizontal piping 121).

[0034] As shown in FIGS. 1 and 4, the rainwater piping main body 120 includes, for example, a horizontal piping 121 and a main pipe (vertical piping) 122. In addition, a junction 120T is formed midway in the height direction of the main pipe (vertical piping) 122, and is configured so that wastewater from the branch pipe 150 can be merged therein. The junction 120T is a joint that joins a portion of the main pipe 122 located above the junction 120T with a portion located below the junction 120T. The junction 120T is formed by a tee (90° Y-shaped pipe), and one of the receiving ports of the junction 120T is connected to the branch pipe 150.

[0035] The horizontal pipe 121 is, for example, configured of a straight pipe arranged along a substantially horizontal direction, and is connected to a main pipe 122 via an elbow (not shown). The horizontal pipe 121 is configured to drain the rainwater that flows in from the siphon-type drainage member 20 into the main pipe 122.

[0036] As shown in Figs. 1 and 4, the main pipe 122 includes, for example, a first vertical pipe 123 and a protection pipe (second vertical pipe) 125 disposed below the first vertical pipe.

[0037] The first vertical pipe 123 is, for example, configured of a rigid straight circular pipe made of PVC with a nominal diameter of 100A, and is arranged along the vertical direction of the building. In this embodiment, a junction 120T is formed midway in the height direction of the first vertical pipe 123. Further, a lower portion of the first vertical pipe 123 is inserted into a curing pipe (second vertical pipe) 125 with a gap therebetween. It is possible to arbitrarily set the material and size (nominal diameter) of the first vertical pipe 123. Also, a configuration in which no gap is formed between the first vertical pipe 123 and the curing pipe (second vertical pipe) 125 may be adopted.

[0038] The protective pipe (second vertical piping) 125 is configured, for example, by a hard PVC circular straight pipe and has a larger flow passage area than the first vertical piping 122. Specifically, in this embodiment, the curing pipe 125 is formed to have a nominal diameter 125A that is one size larger than the first vertical pipe 123.

[0039] Furthermore, it is preferable that the curing pipe (second vertical pipe) 125 is arranged, for example, concentrically with the first vertical pipe 123, and that a radially approximately equal gap is formed between the outer peripheral surface of the first vertical pipe 123 and the inner peripheral surface of the curing pipe 125 around the entire circumference.

[0040] In addition, the height of the upper opening (vertical pipe connection part) of the curing pipe (second vertical piping) 125 can be set arbitrarily, but it is preferable that it opens at a height of 10 m or less from the ground, for example, and it is even more preferable that it opens at a height of 2 m or less from GL (ground level). In addition, it is preferable that the upper opening of the curing pipe (second vertical piping) 125 is opened at a position lower than the third floor of the building 10, for example. Furthermore, it is more preferable that the upper opening of the curing pipe 125 is located, for example, on the second floor or lower of the building 10, and it is even more preferable that it is located on the first floor.

[0041] In this embodiment, the lower side of the curing pipe 125 is buried in the ground and is arranged to rise up from the ground. In addition, the curing pipe 125 is connected to a storm water inlet 160 via, for example, an elbow 126, a connecting pipe 127, and an elbow 128, so that wastewater flowing down from the first vertical pipe 123 is discharged into the storm water inlet 160. In addition, it is preferable that a distance between the elbow 126 and the lower opening of the first vertical pipe 123 is 1 m or more, and preferably 300 mm or more.

[0042] The material of the curing pipe (second vertical piping) 125 can be set arbitrarily. In addition, it is possible to arbitrarily set the size (nominal diameter) and flow path area of ​​the protective pipe (second vertical piping) 125. For example, the nominal diameter of the protective pipe 125 may be set to be two or more sizes larger than the nominal diameter of the first vertical piping 123. In addition, the flow path area of ​​the curing pipe 125 may be set to be larger than the flow path area of ​​the first vertical pipe 123 by an area difference of less than one size in nominal diameter, or may be set to an area difference of more than one size. In addition, it is possible to arbitrarily set whether or not the protective pipe (second vertical pipe) 125 is concentric with the first vertical pipe 123, and the protective pipe 125 and the first vertical pipe 123 may be arranged eccentrically.

[0043] The branch pipe 150 is configured to make rainwater that flows into the branch pipe 150 from the large eaves 10c located on the third floor of the building 10 merge with the first vertical pipe 123 at the junction 120T. Note that the rainwater that flows into the branch pipe 150 is not limited to rainwater that flows in from the large eaves 10c, and may be, for example, rainwater that flows in from a balcony or a driveway provided on the building 10 (for example, a driveway that is provided on the periphery of the building 10 and thus has a portion exposed to the outdoors). In this embodiment, the junction 120T is located, for example, on the third floor of the building 10, and is set, for example, at a height of 10 m or less from the ground surface.

[0044] According to the rainwater drainage system (rainwater drainage piping structure) 100 of the first embodiment, the main pipe 122 is provided with a first vertical pipe 123 arranged on the upper side, and a protective pipe (second vertical pipe) 125 arranged on the lower side of the first vertical pipe 123, and the protective pipe 125 is formed with a nominal diameter 125A, which is one size larger than the first vertical pipe 123, and has a flow path area larger than the first vertical pipe 123. Therefore, when drainage water flows down from upper floors to lower floors by utilizing the siphon effect, it is possible to suppress the internal pressure of the main pipe 122 from rising to a positive pressure. As a result, the wastewater can be stably merged from the branch pipe 150 into the main pipe 222 at the junction 120T.

[0045] Furthermore, according to the storm water drainage system 100 of the first embodiment, for example, at the junction 120T formed on a low floor below the third floor or below 10 m above ground level, the drainage water from the branch pipe 150 can be stably merged into the main pipe 122. As a result, the branch pipe 150 can be connected to the main pipe 122 at a lower level or on a lower floor of the building 10 .

[0046] Moreover, according to the storm water drainage system 100 according to the first embodiment, the junction 120T is formed midway in the height direction of the first vertical pipe 123, the protective pipe 125 is positioned below the junction 120T, and the protective pipe 125 is arranged at a distance from the outer wall surface of the first vertical pipe 123, so that the rain water can be stably discharged to the storm water inlet 160 with a simple structure. Note that even in such a configuration in which the protective pipe 125 is positioned below the junction 120T, it has been confirmed that the drainage water from the branch pipe 150 is reliably merged into the main pipe 122, for example, if the flow rate of the drainage water merging from the branch pipe 150 to the junction 120T is 5 L / s (liters per second) or less.

[0047] Furthermore, according to the storm water drainage system 100 according to the first embodiment, the confluence section 120T can be formed at a height of 10 m or less from the ground surface, so that the system can be placed at an inconspicuous low position in the building 10. Furthermore, according to the rainwater drainage system 100 of the first embodiment, the confluence section 120T can be formed on the lower floors of the building 10, such as the third floor or lower, thereby improving the design freedom of the rainwater drainage system (rainwater drainage piping structure) 100.

[0048] <Second embodiment> Hereinafter, a rainwater drainage system (rainwater drainage piping structure) according to a second embodiment of the present invention will be described with reference to FIG. Fig. 5 is a schematic diagram illustrating the schematic configuration of a rainwater drainage system according to the second embodiment. In Fig. 5, reference numeral 200 denotes a rainwater drainage system (rainwater drainage piping structure), reference numeral 220 denotes a rainwater piping body, reference numeral 121 denotes a horizontal pipe, reference numeral 222 denotes a main pipe, reference numeral 223 denotes a first vertical pipe, reference numeral 225 denotes a second vertical pipe, reference numeral 222S denotes an increaser, and reference numeral 220T denotes a junction.

[0049] The rainwater drainage system (rainwater drainage piping structure) 200 is applied to, for example, an eight-story building 10. The rainwater drainage system 200 also includes, for example, a siphon-type drainage member (not shown), a rainwater piping main body 220 that drains rainwater flowing in from the siphon-type drainage member toward lower floors, and a branch pipe 150 connected to a junction 220T of the rainwater piping main body 220 on an intermediate floor (for example, the third floor).

[0050] The storm water drainage system 200 is configured so that the drainage water flowing down from the upper floors and the drainage water from the branch pipe 150 are joined at a junction 220T and drained into a storm water inlet 160. The siphon type drainage member and the rainwater catch basin 160 are similar to the siphon type drainage member 110 and the rainwater catch basin 160 in the first embodiment, and therefore a description thereof will be omitted.

[0051] As shown in FIG. 5, the rainwater piping main body 220 includes, for example, a horizontal piping 121 and a main pipe (vertical piping) 222. In addition, a junction 220T is formed in the main pipe (vertical piping) 222, and is configured so that the drainage water from the branch pipe 150 joins there. The junction 220T is a joint that joins a portion of the main pipe 222 located above the junction 220T with a portion located below the junction 220T. The junction 220T is formed by a tee (90° Y-shaped pipe), and one of the receiving ports of the junction 220T is connected to the branch pipe 150. The horizontal pipe 121 is similar to that in the first embodiment, so it is given the same reference numerals and the description thereof is omitted.

[0052] As shown in FIG. 5, the main pipe 222 includes, for example, a first vertical pipe 223, a second vertical pipe 225 disposed below the first vertical pipe 223, and an increaser 222S.

[0053] The first vertical pipe 223 is configured, for example, by a straight circular pipe made of hard PVC with a nominal diameter of 100A, and is arranged along the vertical direction of the building. In this embodiment, a junction 220T is formed midway in the height direction of the first vertical pipe 223. In addition, the lower end of the first vertical pipe 223 is connected to the second vertical pipe 225 via an increaser 222S. The material and size (nominal diameter) of the first vertical pipe 223 can be set arbitrarily.

[0054] The second vertical pipe 225 is configured, for example, by a hard PVC circular straight pipe, has a larger flow passage area than the first vertical pipe 223, and is disposed along the vertical direction of the building 10. Specifically, the second vertical pipe 225 is formed, for example, with a nominal diameter 125A that is one size larger than the first vertical pipe 223.

[0055] The increaser 222S is formed, for example, from a hard PVC resin, and serves as a diameter expansion joint having one end (upper side) formed to a nominal diameter of 100A and the other end (lower side) formed to a nominal diameter of 125A. The first vertical pipe 223 and the second vertical pipe 225 are connected to form a portion of the main pipe 222 where the flow path area is expanded from a nominal diameter of 100A to a nominal diameter of 125A. The material for forming the increaser 222S can be arbitrarily selected.

[0056] Furthermore, the height of the connection portion (vertical pipe connection portion) where the increaser 222S is arranged can be set arbitrarily, but is preferably set to, for example, 10 m or less from the ground. Furthermore, the height of the increaser 222S is preferably placed on the third floor or lower of the building 10, more preferably on the second floor or lower, and even more preferably on the first floor.

[0057] In this embodiment, the lower side of the second vertical pipe 225 is buried in the ground and is connected to a storm water inlet 160 via, for example, an elbow 126, a connecting pipe 127, and an elbow 128.

[0058] The material of the second vertical pipe 225 can be set arbitrarily. In addition, it is possible to arbitrarily set the size (nominal diameter) and flow path area of ​​the second vertical pipe 225. For example, the nominal diameter of the second vertical pipe 225 may be set to be two or more sizes larger than the nominal diameter of the first vertical pipe 223. In addition, the flow path area of ​​the second vertical pipe 225 may be set larger than the flow path area of ​​the first vertical pipe 223 by an area difference of less than one size in nominal diameter, or may be set to an area difference of more than two sizes.

[0059] The branch pipe 150 is configured to make rainwater that has flowed into the branch pipe 150 from, for example, the large eaves 10c merge with the first vertical pipe 223 at the junction 220T. In this embodiment, the junction 220T is located, for example, on the third floor of the building 10, and is set, for example, at a height of 10 m or less from the ground surface.

[0060] According to the rainwater drainage piping structure (drainage piping structure) 200 of the second embodiment, the confluence 220T is formed in the first vertical pipe 223, and the second vertical pipe 225 is connected to the first vertical pipe 223 via an increaser 222S below the confluence 220T, so that the internal pressure at the confluence 220T becomes negative pressure, and the drainage can be stably merged from the branch pipe 150 into the main pipe 222.

[0061] <Third embodiment> Hereinafter, a rainwater drainage system (rainwater drainage piping structure) according to a third embodiment of the present invention will be described with reference to Fig. 6. Fig. 6 is a schematic diagram illustrating the schematic configuration of the rainwater drainage system (rainwater drainage piping structure) according to the third embodiment. In FIG. 6, reference numeral 300 indicates a rainwater drainage system (rainwater drainage piping structure), reference numeral 320 indicates the rainwater piping body, reference numeral 121 indicates a horizontal pipe, reference numeral 322 indicates a main pipe, reference numeral 323 indicates a first vertical pipe, reference numeral 325 indicates a second vertical pipe, reference numeral 322S indicates an increaser, reference numeral 320T indicates a junction, and reference numeral 150A indicates a branch pipe.

[0062] The rainwater drainage system (rainwater drainage piping structure) 300 is applied to, for example, an eight-story building 10. The rainwater drainage system 300 also includes, for example, a siphon-type drainage member (not shown), a rainwater piping main body 320 that drains rainwater flowing in from the siphon-type drainage member toward lower floors, and a branch pipe 150A connected to a junction 320T of the rainwater piping main body 320 on an intermediate floor (for example, the third floor). The storm water drainage system 300 is configured to drain the drainage water flowing down from the upper floors and the drainage water combined with the branch pipe 150A into a storm water inlet 160 buried underground. The siphon-type drainage member and the rainwater catch basin 160 are similar to those in the first embodiment, and therefore the description thereof will be omitted.

[0063] As shown in FIG. 6, the rainwater piping main body 320 includes, for example, a horizontal piping 121 and a main pipe (vertical piping) 322. Also, a junction 320T is formed in main pipe (vertical piping) 322, and is configured so that the drainage water from branch pipe 150A joins with it. Junction 320T is a joint that joins a portion of main pipe 322 located above junction 320T with a portion located below junction 320T. Junction 320T is formed by a tee (90° Y-shaped pipe), and one of the receiving ports of junction 320T is connected to branch pipe 150A. Incidentally, the horizontal pipe 121 is similar to that in the first embodiment, and therefore the description thereof will be omitted.

[0064] As shown in FIG. 6, the main pipe 322 includes, for example, a first vertical pipe 323, a second vertical pipe 325 disposed below the first vertical pipe 323, and an increaser 322S.

[0065] The first vertical pipe 323 is configured, for example, of a hard PVC circular straight pipe having a nominal diameter of 100A, and is arranged along the vertical direction of the building. In this embodiment, an increaser 322S and a junction 320T are connected to the lower end of the first vertical pipe 323 in this order. Moreover, the first vertical pipe 323 is connected to the second vertical pipe 325 via an increaser 322S and a junction 320T.

[0066] And, the branch pipe 150A is connected to the junction 320T. The material and size (nominal diameter) of the first vertical pipe 323 can be set arbitrarily.

[0067] The second vertical pipe 325 is configured, for example, by a hard PVC circular straight pipe, has a larger flow passage area than the first vertical pipe 322, and is disposed along the vertical direction of the building 10. Specifically, the second vertical pipe 325 is formed, for example, with a nominal diameter 125A that is one size larger than the first vertical pipe 323.

[0068] The increaser 322S is formed, for example, from a hard PVC resin, and serves as a diameter expansion joint having one end (upper side) formed to a nominal diameter of 100A and the other end (lower side) formed to a nominal diameter of 125A. The first vertical pipe 323 and the second vertical pipe 325 are connected via a junction 320T to form a portion of the main pipe 322 where the flow path area is expanded from a nominal diameter of 100A to a nominal diameter of 125A. The material for forming the increaser 322S can be arbitrarily selected.

[0069] Furthermore, the height of the connection part (vertical pipe connection part) where the increaser 322S is arranged can be set arbitrarily, but it is preferable that it is arranged, for example, 10 m or less above the ground. In addition, the height of the increaser 322S is, for example, preferably placed on the third floor or lower of the building 10, more preferably placed on the second floor or lower of the building 10, and even more preferably placed on the first floor.

[0070] In this embodiment, the lower side of the second vertical pipe 325 is buried in the ground and is connected to the storm water inlet 160 via, for example, an elbow 126, a connecting pipe 127, and an elbow 128.

[0071] The material of the second vertical pipe 325 can be arbitrarily selected. In addition, it is possible to arbitrarily set the size (nominal diameter) and flow path area of ​​the second vertical pipe 325. For example, the nominal diameter of the second vertical pipe 325 may be set to be two or more sizes larger than the nominal diameter of the first vertical pipe 323. In addition, the flow path area of ​​the second vertical pipe 325 may be set to be larger than the flow path area of ​​the first vertical pipe 323 by an area difference of less than one size in nominal diameter, or may be set to an area difference of more than one size.

[0072] The branch pipe 150A is configured to make rainwater that has flowed into the branch pipe 150A from, for example, the large eaves 10c merge with the first vertical pipe 323 at a junction 320T. In this embodiment, the junction 320T is located, for example, on the third floor of the building 10, and is set, for example, at a height of 10 m or less from the ground surface.

[0073] According to the rainwater drainage system (rainwater drainage piping structure) 300 of the third embodiment, the confluence 320T is formed in the second vertical pipe 325, and the second vertical pipe 325 is connected to the first vertical pipe 323 via an increaser 320S arranged above the confluence 320T, so that the internal pressure at the confluence 320T becomes negative pressure, and the wastewater can be stably merged from the branch pipe 150 into the main pipe 322. In addition, since the flow path area in main pipe 322 is already large at junction 320T, the flow rate of wastewater merging at junction 320T can be increased. In this case, it has been confirmed that wastewater from branch pipe 150A is reliably merged into main pipe 122 even if the flow rate of wastewater merging from branch pipe 150A to junction 320T is 5 L / s (liters per second) or more.

[0074] <Fourth embodiment> Hereinafter, a rainwater drainage system (rainwater drainage piping structure) according to a fourth embodiment of the present invention will be described with reference to Figs. Fig. 7 is a conceptual diagram for explaining an example of a schematic configuration of a rainwater drainage system according to the fourth embodiment. Fig. 8 is a vertical cross-sectional view for explaining an example of a schematic configuration of a siphon-type drainage member applied to the rainwater drainage system according to the fourth embodiment, and Fig. 9 is a perspective view.

[0075] In Figures 7 to 9, symbol 10A indicates a building, symbol 100A indicates a rainwater drainage system (rainwater drainage piping structure), symbol 110 indicates a siphon-type drainage member, symbol 120 indicates the rainwater piping body, symbol 121 indicates a horizontal pipe, symbol 122 indicates a main pipe, symbol 123 indicates a first vertical pipe, symbol 125 indicates a protective pipe (second vertical piping), and symbol 150 indicates a branch pipe.

[0076] As shown in FIG. 7, a rainwater drainage system (rainwater drainage piping structure) 100A is applied to, for example, an eight-story building 10A (for example, 24 m high). The building 10A can be, for example, a factory or shopping center that is 20 m or more in height.

[0077] The rainwater drainage system 100A further includes, for example, a siphon-type drainage member 110, a rainwater piping main body 120 that drains rainwater flowing in from the siphon-type drainage member 110 toward the lower floors, and a branch pipe 150 connected to the rainwater piping main body 120 at a junction 120T on an intermediate floor. The storm water drainage system 100A is configured to drain the drainage water flowing down from the upper floors and the drainage water combined with the branch pipe 150 into a storm water inlet 160 (see the first embodiment) buried underground.

[0078] As shown in Figures 8 and 9, the siphon-type drainage member 110 includes, for example, a base plate portion 111 formed in a substantially circular shape with a circular through hole 110H formed in the center, a plurality of vertical ribs 112 formed integrally with the upper surface of the base plate portion 111, rising upward, and arranged at intervals in the circumferential direction, and a tubular portion 113 extending downward from the peripheral portion of the through hole 110H.

[0079] The base plate portion 111, the vertical ribs 112, and the cylindrical portion 113 are integrally formed by casting a metal material such as an aluminum alloy, cast iron, or stainless steel. Moreover, the siphon-type drainage member 110 is disposed (eg, buried) on the upper surface of the roof slab 15, for example.

[0080] The vertical rib 112 is formed, for example, in a substantially U-shape in plan view, with the bottom of the U-shape (the folded curved portion) being disposed on the side of the through hole 111H. In addition, the vertical rib 112 is formed, for example, such that a pair of opposing raised wall portions formed from the bottom of the U-shape toward the opening side extend radially outward from the center of the flow hole 111H, and the spacing between them becomes wider as they extend radially outward.

[0081] The lower end of the tubular portion 113 is disposed in a through hole 15H formed in the roof slab 15, and is connected to a connecting short pipe 121A by a connecting member 121B. The cylindrical portion 113 is connected to the horizontal pipe 121 via a connecting short pipe 121A and a T-shaped joint 121T, and is configured to allow rainwater flowing into the siphon-type drainage member 110 to flow into the horizontal pipe 121.

[0082] In addition, the siphon-type drainage member 110 suppresses the formation of an air column near the center of the rainwater (drainage) that flows into the tube portion 113 due to the siphon phenomenon, thereby allowing the rainwater to flow efficiently toward the floor below. The configuration of the siphon-type drainage member 110 is merely an example, and the configuration can be set arbitrarily. EXAMPLES

[0083] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the examples, the comparative example and invention examples 1 to 5 were used to carry out the following verification test 1 and verification test 2 to confirm the effects of the storm water drainage system.

[0084] In the examples, a storm water drainage system (storm water drainage piping structure) shown in Fig. 10 and Fig. 11 was used. Fig. 10 is a conceptual diagram for explaining the schematic configuration of the storm water drainage system used in the examples, and Fig. 11 is a conceptual diagram for explaining the specific configuration of the storm water drainage system in the examples. The rainwater drainage system (rainwater drainage piping structure) is composed of piping made of transparent resin material. In addition, the storm water drainage system is installed in an eight-story experimental facility (building) as shown in Figure 10.

[0085] The experimental facility (building) has a first floor height of 3.0 m from ground level (GL) up to the second floor, and the heights of the second through eighth floors are each set at 2.8 m. In addition, the siphon-type drainage component is installed 1.0 m above the floor surface on the 8th floor. In addition, in the storm water drainage system, a pressure sensor for measuring the pressure inside the main pipe (vertical piping) was installed at the pressure measurement position shown in Figure 10. Also, as shown in Figure 10, an expansion joint was placed midway through the main pipe.

[0086] Comparative Example In the comparative example, as shown in FIG. 11, a junction was provided by connecting a branch pipe to a main pipe at a midpoint in the height direction, where the flow path area in the vertical direction does not change. Main pipe: Nominal diameter 100A Branch pipe: 90° Y pipe with nominal diameter of 100A Junction: GL+6.5m (3rd floor floor surface+1700mm)

[0087] [Example 1 of the present invention] Example 1 of the present invention corresponds to the first embodiment, and uses a first vertical pipe placed on the upper side and a protective pipe (second vertical pipe) placed below the first vertical pipe, and the lower part of the first vertical pipe is inserted into the protective pipe to form a main pipe. Then, a branch pipe was connected to the first vertical pipe above the upper end opening of the curing pipe (second vertical pipe) to establish a junction. First vertical pipe: Nominal diameter 100A Curing pipe (second vertical pipe): Nominal diameter 125A Curing pipe (second vertical pipe): Nominal diameter 125A Height of the connection between the first vertical pipe and the curing pipe (second vertical pipe): GL+1000m Branch pipe: 90° Y pipe with nominal diameter of 100A In addition, a gap was provided between the first vertical pipe and the curing pipe (second vertical pipe). Junction: GL+5.5m (3rd floor floor surface+700mm)

[0088] [Example 2 of the present invention] Present invention example 2 corresponds to the first embodiment, and has the same configuration as present invention example 1. Specifically, present invention example 2 differs from present invention example 1 in the height of the joining portion. First vertical pipe: Nominal diameter 100A Curing pipe (second vertical pipe): Nominal diameter 125A Height of the connection between the first vertical pipe and the curing pipe (second vertical pipe): GL+1000m Branch pipe: 90° Y pipe with nominal diameter of 100A In addition, a gap was provided between the first vertical pipe and the curing pipe (second vertical pipe). Junction: GL+1.86m (2nd floor floor surface+860mm)

[0089] [Example 3 of the present invention] In Example 3 of the present invention, which corresponds to the second embodiment, a main pipe is formed by connecting a first vertical pipe arranged on the upper side and a second vertical pipe arranged below the first vertical pipe with an increaser. A branch pipe is connected to the first vertical pipe above the second vertical pipe to provide a junction. First vertical pipe: Nominal diameter 100A Second vertical pipe: Nominal diameter 125A Branch pipe: 90° Y pipe with nominal diameter of 100A Increaser height:GL+450mm Branch pipe: 90° Y pipe with nominal diameter of 100A Junction: GL+2.86m (2nd floor floor surface+1860mm)

[0090] [Example 4 of the present invention] Present invention example 4 corresponds to the second embodiment, and was configured similarly to present invention example 3. Specifically, present invention example 4 differs from present invention example 3 in the connection joint used at the junction. First vertical pipe: Nominal diameter 100A Second vertical pipe: Nominal diameter 125A Branch pipe: 90° Y pipe with nominal diameter of 100A Increaser height:GL+450mm Branch pipe: 45° Y pipe with nominal diameter of 100A Junction: GL+2.86m (2nd floor floor surface+1860mm)

[0091] [Example 5 of the present invention] In the fifth embodiment of the present invention, a first vertical pipe was arranged on the upper side, and a second vertical pipe was arranged below the first vertical pipe. The first vertical pipe and the second vertical pipe were connected by an increaser to form a main pipe. A branch pipe was connected to the second vertical pipe midway through the second vertical pipe to provide a junction. First vertical pipe: Nominal diameter 100A Second vertical pipe: Nominal diameter 125A Increaser height:GL+450mm Branch pipe: Large bent 90° Y pipe (LT pipe) with nominal diameter of 100A Junction: GL+2.86m (2nd floor floor surface+1860mm)

[0092] (1) Verification Test 1 Hereinafter, the verification results of the verification test 1 in the embodiment will be described with reference to FIG. FIG. 12 is a pressure distribution diagram illustrating the internal pressure of the main pipe of the storm water drainage system in the verification test 1 in the examples. Using the comparative example and invention examples 1 to 3, rainwater was supplied from the siphon-type drainage member through a horizontal pipe to the main pipe to verify the change in the internal pressure of the main pipe.

[0093] In verification test 1, as shown in Figure 12, in both the comparative example and invention examples 1 to 3, the pressure inside the pipes of the drainage water supplied from the siphon drainage member was negative pressure on the upper floors (for example, approximately 60 kPa at the floor surface of the 8th floor), and no significant difference was observed. However, in the comparative example, the pressure inside the pipes increases linearly as one descends to lower floors, reaching zero near the third floor (GL + approximately 6 m), and then increasing to positive pressure on the first and second floors.

[0094] On the other hand, in Examples 1 to 3 of the present invention, as shown in Figure 12, the pipe pressure increases to the same extent as the comparative example on floors above the 5th floor, but the increase in pipe pressure is slower on floors below the 5th floor compared to the comparative example. It was also confirmed that in Examples 1 to 3 of the present invention, the internal pressure of the main pipe was maintained at a negative pressure even when the temperature dropped to the second floor surface. Therefore, in Examples 1 to 3 of the present invention, it is possible to stably merge the drainage water from the branch pipe into the main pipe.

[0095] (2) Verification Test 2 Hereinafter, the verification results of the verification test 2 in the embodiment will be described with reference to FIG. Fig. 13 is a diagram illustrating the confluence flow rate of the branch pipes of the storm water drainage system in the verification test 2 in the embodiment. In Fig. 13, ◯ indicates that the flows can be smoothly confluent, and ■△ indicates that the flows can be confluent although backflow occurs occasionally. Verification test 2 was performed using Examples 3 to 5 of the present invention, in which rainwater was supplied from the siphon-type drainage member through a horizontal pipe to the main pipe, and wastewater was merged from the branch pipe into the main pipe while changing the flow rate. The merging state of the wastewater at the junction was visually observed to verify the wastewater flow rate that could be merged from the branch pipe into the main pipe. The flow rate of rainwater discharged from the siphon drainage element into the main pipe is 40 L / S.

[0096] In the verification test 2, as shown in FIG. 13, when the drainage flow rate from the branch pipe was 1 L / S to 2 L / S, all of the invention examples 3 to 5 stably merged into the main pipe. On the other hand, in the third example of the present invention, as shown in FIG. 13, when the drainage flow rate from the branch pipe is 3 L / S, merging becomes more difficult than when it is 1 L / S to 2 L / S. Moreover, it can be said that in Example 4 of the present invention, even when the drainage flow rate from the branch pipe is 5 L / S, the drainage can be stably joined to the main pipe. Moreover, it can be said that in Example 5 of the present invention, even when the drainage flow rate from the branch pipe is 10 L / S, the drainage can be stably joined to the main pipe. As described above, it was confirmed that invention examples 4 and 5 were more advantageous than invention example 3 in that the drainage flow rate that could be joined from the branch pipe was large.

[0097] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

[0098] In the above embodiment, in the rainwater drainage system (rainwater drainage piping structure) 100, 200, 300, the first vertical pipe 123, 223, 323 is formed with a nominal diameter of 100A, the protective pipe 125 and the second vertical pipe 225, 325 are formed with a nominal diameter of 125A, and the first vertical pipe is formed with a nominal diameter one size larger than the protective pipe and the second vertical pipe. However, the flow path cross-sectional area or nominal diameter of the first vertical pipe 123, 223, 323, the protective pipe 125, and the second vertical pipe 225, 325 can be set arbitrarily.

[0099] For example, the flow path area of ​​the protective pipe 125 and the second vertical pipes 225, 325 may be set to a flow path area difference that is less than one size larger than the flow path area of ​​the first vertical pipes 123, 223, 323, or may be set to a flow path area difference that is more than one size larger. In addition, the nominal diameters of the protective pipe 125 and the second vertical pipes 225, 325 may be set to be larger than the flow path area of ​​the first vertical pipe 123 by an area difference of less than one size in nominal diameter, or may be set to an area difference of more than one size.

[0100] Furthermore, in the above embodiment, for example, a case has been described in which the upper opening of the curing pipe 125 in the storm water drainage system 100 is formed 2 m or less from the ground surface, but the height at which the upper opening of the curing pipe 125 is formed can be set arbitrarily, and for example, it may be formed at a position higher than 2 m.

[0101] In addition, in the above embodiment, the increasers 222S, 322S are described as being located 10 m or less from the ground and on the third floor or lower of the building 10, but the vertical position at which the increasers 222S, 322S are located can be set arbitrarily.

[0102] In addition, in the above embodiment, the junctions 120T, 220T, and 320T are described as being formed on the third floor or lower or at a height of 10 m or lower. However, for example, the junctions 120T, 220T, and 320T may be formed on a floor higher than the third floor or at a height of more than 10 m.

[0103] In addition, in the above embodiment, the junction where the branch pipes 150, 150A join the main pipes 122, 222, 322 is configured by a tee (90° Y pipe), but various joints may be applied without being limited to tee, such as a 45° Y pipe or a large bend 90° Y pipe (LT pipe).

[0104] In addition, in the above embodiment, the increaser 222S, 322S is used to expand the diameter from the first vertical pipe 223, 323 to the second vertical pipe 225, 325. However, various types of expansion joints may be applied, or the diameter may be expanded using a Y-shaped pipe such as a Tee pipe having a small diameter on the upper side (one end) and a large diameter on the lower side (the other end).

[0105] Further, in the above embodiment, the case where the siphon-type drainage member 110 is installed on the rooftop has been described, but the location is not limited to the rooftop, and the member may be installed on a roof, a balcony, or the like, for example.

[0106] In addition, within the scope of the invention, it is possible to replace the components in the above-described embodiments with well-known components, and the above-described embodiments may be combined as appropriate. [Explanation of symbols]

[0107] 10, 10A Building 100, 100A, 200, 300 Rainwater drainage system (rainwater drainage piping structure) 20, 110 Siphon type drainage member 120, 220, 320 Rainwater pipe body 120T, 220T, 320T confluence section 121 Horizontal pipe 122, 222, 322 Main 123, 223, 323 First vertical pipe 125 Curing pipe (second vertical piping) 150, 150A branch pipe 160 Stormwater Inlet 222S, 322S Increaser 225, 325 Second vertical piping

Claims

1. A rainwater drainage piping structure that is arranged in a building and drains rainwater, A drainage member having a plurality of vertical ribs arranged in a circumferential direction with respect to an inlet through which rainwater flows in; A main pipe through which rainwater flowing in from the drainage member flows; a branch pipe connected to a junction located midway in the height direction of the main pipe and allowing wastewater to flow into the junction from the outside; The main pipe is a first vertical pipe disposed on an upper side and connected to the drainage member; and a second vertical pipe disposed below the first vertical pipe and having a flow path area larger than that of the first vertical pipe, The junction is provided in the second vertical pipe, The nominal diameter of the second vertical pipe is one size or more larger than the nominal diameter of the first vertical pipe, A rainwater drainage piping structure, characterized in that the drainage member is capable of draining a larger flow rate than the branch pipe.

2. A rainwater drainage piping structure that is arranged in a building and drains rainwater, A drainage member having a plurality of vertical ribs arranged in a circumferential direction with respect to an inlet through which rainwater flows in; A main pipe through which rainwater flowing in from the drainage member flows; a branch pipe connected to a junction located midway in the height direction of the main pipe and allowing wastewater to flow into the junction from the outside; The main pipe is a first vertical pipe disposed on an upper side and connected to the drainage member; and a second vertical pipe disposed below the first vertical pipe and having a flow path area larger than that of the first vertical pipe, The junction is provided in the first vertical pipe, The nominal diameter of the second vertical pipe is one size or more larger than the nominal diameter of the first vertical pipe, A rainwater drainage piping structure, characterized in that the drainage member is capable of draining a larger flow rate than the branch pipe.

3. The second vertical pipe is a curing pipe located below the junction and arranged at a distance from an outer wall portion of the first vertical pipe, The rainwater drainage piping structure according to claim 2, wherein a lower side of the curing pipe is buried underground.

4. A storm water drainage piping structure as described in Claim 3, characterized in that the lower end of the curing pipe is connected to an elbow buried in the ground.

5. A rainwater drainage piping structure according to any one of claims 1 to 4, A rainwater drainage piping structure, characterized in that the internal pressure of the pipe at the confluence is negative pressure.

6. The drainage member is An attachment tube that is inserted into the inlet to form a drop opening; A flange portion provided at an upper end of the mounting tube; A lid portion is provided at a position spaced above the drop opening, The rainwater drainage piping structure according to any one of claims 1 to 5, wherein the vertical rib is connected to an outer periphery of the lid portion.

7. An expansion joint is provided above the confluence. The rainwater drainage piping structure according to any one of claims 1 to 6.

8. A roof on which the rainwater drainage piping structure according to any one of claims 1 to 7 is arranged.

9. A building in which a storm water drainage piping structure described in any one of claims 1 to 7 is arranged.

10. The building according to claim 9, wherein the confluence portion is provided below a main eave of the building.

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