JP2021055348A - Rainwater drain pipe structure - Google Patents

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

The present invention relates to a rainwater drainage pipe structure that is arranged in a building and drains rainwater from the upper floors to the lower floors.

As is well known, in the buildings of large facilities such as factories and shopping centers, as the buildings become more versatile and complicated, siphon-type drainage members are placed on the rooftops and balconies to drain rainwater. Technology for efficient drainage from the floor downstairs is becoming widespread.

The rainwater piping main body system using the siphon type drainage member causes a siphon phenomenon in the pipe in the rainwater flowing from the siphon type drainage member, and this siphon phenomenon makes the pipe flow full and improves the drainage capacity (for example). , Patent Document 1).

JP-A-2019-007250

However, in the rainwater piping main body system using the siphon phenomenon, the pressure inside the main pipe becomes negative on the upper floors, but the pressure inside the pipe rises as it approaches the lower floors, and the pressure inside the drainage pipe is positive on the lower floors. As the pressure rises, it becomes increasingly difficult to merge the drainage from the branch pipes into the main pipe. In particular, if the bottom layer of the main pipe is provided with an elbow that changes the direction of the drainage flow in the horizontal direction (horizontal direction), the pressure inside the pipe on the lower floors will increase significantly when the elbow receives the drainage. Tend to do.
As a result, the places where drainage can be merged into the main pipe are limited, and it is impossible to merge in the lower floors where the pressure inside the pipe is positive.

The present invention has been made in consideration of such circumstances, and when rainwater is drained from the upper floors to the lower floors by applying the siphon phenomenon, a branch pipe is provided at a confluence portion provided on the middle floor. It is an object of the present invention to provide a rainwater drainage pipe structure capable of stably merging drainage into the main pipe.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a rainwater drainage piping structure arranged in a building to drain rainwater from an upper floor to a lower floor, and a siphon type drainage member arranged on the upper floor and the siphon type drainage member. A branch that is connected to a main pipe that allows rainwater flowing in from the upper floor to flow down from the upper floor to the lower floor, and a confluence portion located in the middle of the main pipe in the height direction, and allows drainage to flow into the confluence portion from the outside. The main pipe is provided with a pipe, and the main pipe is arranged on the upper side and connected to the siphon type drainage member, and is arranged on the lower side of the first vertical pipe and is larger than the first vertical pipe. It is characterized by including a second vertical pipe having a flow path area.

According to the rainwater drainage piping structure according to the present invention, a siphon type drainage member arranged on the upper floor, a main pipe for flowing rainwater flowing from the siphon type drainage member from the upper floor to the lower floor, and a height of the main pipe. A first vertical pipe that is connected to a confluence located in the middle of the vertical direction and is provided with a branch pipe that allows drainage to flow into the confluence from the outside, and the main pipe is arranged on the upper side and connected to a siphon type drainage member. Since it is provided with a pipe and a second vertical pipe arranged below the first vertical pipe and having a larger flow path area than the first vertical pipe, the siphon phenomenon is applied from the upper floor to the lower floor. When draining rainwater, the drainage can be stably merged from the branch pipe to the main pipe at the confluence portion provided on the middle floor.
As a result, branch pipes can be connected to the mains at lower positions of buildings and on lower floors.

The invention according to claim 2 is the rainwater drainage pipe structure according to claim 1, wherein the merging portion is formed in the first vertical pipe, and the second vertical pipe is located below the merging portion. It is characterized in that it is a curing pipe arranged at a distance from the outer wall portion of the first vertical pipe.

According to the rainwater drainage pipe structure according to the present invention, the merging portion is formed in the first vertical pipe, the second vertical pipe is located below the merging portion, and is spaced from the outer wall portion of the first vertical pipe. Since the curing pipes are arranged apart, the first vertical pipe and the second vertical pipe can be connected by a simple structure.

The invention according to claim 3 is the rainwater drainage pipe structure according to claim 1, wherein the merging portion is formed in the first vertical pipe, and the second vertical pipe is on the lower side of the merging portion. It is characterized in that it is connected to the first vertical pipe via an increaser arranged in.

According to the rainwater drainage pipe structure according to the present invention, the merging portion 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 merging portion. Since they are connected, the pressure inside the pipe at the confluence becomes negative, and drainage can be stably merged from the branch pipe to the main pipe.

The invention according to claim 4 is the rainwater drainage pipe structure according to claim 1, wherein the merging portion is formed in the second vertical pipe, and the second vertical pipe is on the upper side of the merging portion. It is characterized in that it is connected to the first vertical pipe via an increaser arranged in.

According to the rainwater drainage pipe structure according to the present invention, the merging portion 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 merging portion. Since they are connected, the pressure inside the pipe at the confluence becomes negative, and drainage can be stably merged from the branch pipe to the main pipe. Further, since the flow path area in the main pipe is already large at the merging portion, the flow rate of the drainage merging at the merging portion can be increased.

The invention according to claim 5 is the rainwater drainage pipe structure according to any one of claims 1 to 4, wherein the nominal diameter of the second vertical pipe is larger than the nominal diameter of the first vertical pipe. It is characterized in that it is set to be one size or more larger.

According to the rainwater drainage pipe structure according to the present invention, the nominal diameter of the second vertical pipe is set to be one size or more larger than the nominal diameter of the first vertical pipe, so that drainage from the branch pipe is efficient at the confluence. Can be merged with.

The invention according to claim 6 is the rainwater drainage pipe structure according to any one of claims 1 to 5, wherein the confluence portion is arranged at 10 m or less from the ground surface.

According to the rainwater drainage pipe structure according to the present invention, since the confluence portion is arranged at 10 m or less from the ground surface, the confluence portion can be arranged at a low position of the building.
As a result, the degree of freedom in designing the rainwater drainage pipe structure can be improved.

The invention according to claim 7 is the rainwater drainage piping structure according to any one of claims 1 to 5, wherein the confluence portion is arranged on the third floor or lower.

According to the rainwater drainage pipe structure according to the present invention, since the confluence portion is arranged on the third floor or lower, the confluence portion can be arranged at a low position of the building.
As a result, the degree of freedom in designing the rainwater drainage pipe structure can be improved.

According to the rainwater drainage piping structure according to the present invention, when rainwater is drained from the upper floors to the lower floors by applying the siphon phenomenon, it is stable from the branch pipe to the main pipe at the confluence provided on the middle floor. The drainage can be merged.

It is a conceptual diagram explaining an example of the schematic structure of the rainwater drainage system which concerns on 1st Embodiment of this invention. It is a perspective view explaining an example of the schematic structure of the siphon type drainage member applied to the rainwater drainage system which concerns on 1st Embodiment. It is a side view explaining an example of the schematic structure of the siphon type drainage member applied to the rainwater drainage system which concerns on 1st Embodiment. It is a schematic block diagram explaining the schematic structure of the rainwater drainage system which concerns on 1st Embodiment. It is a schematic block diagram explaining the schematic structure of the rainwater drainage system which concerns on 2nd Embodiment of this invention. It is a schematic block diagram explaining the schematic structure of the rainwater drainage system which concerns on 3rd Embodiment of this invention. It is a conceptual diagram explaining an example of the schematic structure of the rainwater drainage system which concerns on 4th Embodiment of this invention. It is a vertical cross-sectional view explaining an example of the schematic structure of the siphon type drainage member applied to the rainwater drainage system which concerns on 4th Embodiment. It is a perspective view explaining an example of the schematic structure of the siphon type drainage member applied to the rainwater drainage system which concerns on 4th Embodiment. It is a conceptual diagram explaining the schematic structure of the rainwater drainage system used in the Example of this invention. It is a conceptual diagram explaining the concrete structure of the rainwater drainage system in an Example. It is a pressure distribution diagram explaining the pressure in the main pipe of the rainwater drainage system which concerns on the verification test 1 in an Example. It is a figure explaining the confluence flow rate of the branch pipe of the rainwater drainage system which concerns on the verification test 2 in an Example.

<First Embodiment>
Hereinafter, the rainwater drainage system (rainwater drainage piping structure) according to the first embodiment will be described with reference to FIGS. 1 to 4.
FIG. 1 is a conceptual diagram illustrating an example of a schematic configuration of a rainwater drainage system according to a first embodiment. Further, FIG. 2 is a vertical cross-sectional 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, and FIG. 3 is a perspective view. Further, FIG. 4 is a schematic configuration diagram illustrating a schematic configuration of the rainwater drainage system according to the first embodiment.

In FIGS. 1 to 4, reference numeral 10 is a building, reference numeral 100 is a rainwater drainage system (rainwater drainage pipe structure), reference numeral 20 is a siphon type drainage member, reference numeral 120 is a rainwater pipe main body, and reference numeral 121 is a horizontal pipe. Reference numeral 122 indicates a main pipe, reference numeral 123 indicates a first vertical pipe, reference numeral 125 indicates a curing pipe (second vertical pipe), and reference numeral 150 indicates a branch pipe.

As shown in FIG. 1, the rainwater drainage system (rainwater drainage pipe structure) 100 is applied to, for example, an 8-story building (for example, a height of 24 m).
The building 10 can be applied to, for example, a factory, a shopping center, a warehouse, a large parking lot, or the like having a height of 20 m or more.

Further, the rainwater drainage system 100 includes, for example, a siphon type drainage member 20, a rainwater pipe main body 120 that drains rainwater flowing from the siphon type drainage member 20 toward a lower floor, and a rainwater pipe at a confluence portion 120T on an intermediate floor. It includes a branch pipe 150 connected to the main body 120.
The rainwater drainage system 100 is configured to drain the drainage flowing down from the upper floor and the drainage merged from the branch pipe 150 to the rainwater basin 160 buried in the ground.
Then, the rainwater that has flowed into the rainwater basin 160 is discharged to the outside of the system through the pipe 161.

As shown in FIG. 1, the siphon type drainage member 20 (drainage member) is provided inside a large rain gutter 11 arranged at the eaves of the roof of the building 10.
The rain gutter 11 receives rainwater flowing down from the eaves of the roof and drains it. The rain gutter 11 is an extruded product of a hard vinyl chloride resin or a synthetic resin such as ABS or AES. The rain gutter 11 is formed in a groove-shaped cross section in which the front wall 11B is erected from the front end of the flat bottom wall 11A and the rear wall 11C is erected from the rear end of the bottom wall 11A. The rain gutter 11 is suspended by, for example, a rain gutter hanging tool (not shown) attached to a fascia plate (not shown).

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 flowing into the rain gutter 11 during heavy rain. The siphon type drainage member 20 is an injection-molded product of a hard vinyl chloride resin or a synthetic resin such as polycarbonate, ABS, or AES. The resin is not limited to synthetic resin, and may be made of cast iron using a mold.

The siphon type drainage member 20 connects a lid member 21 formed in a plate shape, a mounting cylinder 22 having an upper end portion having a drop opening portion 22a, and a lid member 21 and a mounting cylinder 22, and has a drop opening in a top view. It includes a plurality of vertical ribs 23 that are arranged at intervals in the circumferential direction at positions that do not overlap the portion 22a.

The mounting cylinder 22 penetrates the bottom wall 11A of the rain gutter 11 in the vertical direction. A collar portion 22D is provided at the upper end of the mounting cylinder 22. The collar portion 22D is arranged 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 peripheral edge of the lid member 21 and the outer peripheral edge of the flange portion 22D becomes an inflow opening 20A for dropping rainwater collected in the rain gutter 11 and flowing it into the opening of the opening portion 22a.

The plurality of vertical ribs 23 connect the flange portion 22D of the mounting cylinder 22 and the outer peripheral portion of the lid member 21. The vertical rib 23 rectifies the rainwater flowing from the inflow opening 20A into the drop opening 22a.
The lid member 21 is supported by the mounting cylinder 22 via a plurality of vertical ribs 23. The lid member 21 is arranged inside the rain gutter 11 and is installed at a position separated upward from the drop opening 22a.

Further, the siphon type drainage member 20 suppresses the formation of an air column near the center of the rainwater (drainage) that has flowed into the drop port 22a due to the siphon phenomenon, and efficiently flows the rainwater downstairs. It has become like.
The configuration of the siphon type drainage member 20 is an example, and the configuration can be arbitrarily set.

As shown in FIG. 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 pipe main body 120 (horizontal pipe 121).

As shown in FIGS. 1 and 4, the rainwater pipe main body 120 includes, for example, a horizontal pipe 121 and a main pipe (vertical pipe) 122.
Further, the main pipe (vertical pipe) 122 is formed with a merging portion 120T in the middle in the height direction so that the drainage from the branch pipe 150 can be merged. The merging portion 120T is a joint that joins a portion of the main pipe 122 located above the merging portion 120T and a portion located below the merging portion 120T. The merging portion 120T is formed of cheese (90 ° Y pipe), and one of the sockets of the merging portion 120T is connected to the branch pipe 150.

The horizontal pipe 121 is composed of, for example, straight pipes arranged along a substantially horizontal direction, and is connected to the main pipe 122 via an elbow (not shown).
Then, the horizontal pipe 121 is adapted to allow rainwater flowing from the siphon type drainage member 20 to flow to the main pipe 122.

As shown in FIGS. 1 and 4, the main pipe 122 includes, for example, a first vertical pipe 123 and a curing pipe (second vertical pipe) 125 arranged below the first vertical pipe. ..

The first vertical pipe 123 is composed of, for example, a hard circular straight pipe made of vinyl chloride having a nominal diameter of 100 A, and is arranged along the vertical direction of the building.
Further, in this embodiment, the merging portion 120T is formed in the middle of the first vertical pipe 123 in the height direction.
Further, the lower portion of the first vertical pipe 123 is inserted into the curing pipe (second vertical pipe) 125 at intervals.
The material and size (nominal diameter) of the first vertical pipe 123 can be arbitrarily set. Further, the configuration may be such that no space is formed between the first vertical pipe 123 and the curing pipe (second vertical pipe) 125.

The curing pipe (second vertical pipe) 125 is composed of, for example, a circular straight pipe made of hard vinyl chloride, and has a larger flow path area than the first vertical pipe 122.
Specifically, in this embodiment, the curing pipe 125 is formed to have a nominal diameter of 125A, which is one size larger than the first vertical pipe 123.

Further, the curing pipe (second vertical pipe) 125 is arranged concentrically with, for example, the first vertical pipe 123, and between the outer peripheral surface of the first vertical pipe 123 and the inner peripheral surface of the curing pipe 125, for example, It is preferable that gaps substantially equal in the radial direction are formed over the entire circumference in the circumferential direction.

Further, the height of the upper opening (vertical pipe connecting portion) of the curing pipe (second vertical pipe) 125 can be arbitrarily set, but for example, the height may be 10 m or less from the ground. It is preferable, and it is more preferable that the opening is 2 m or less from the GL (ground).
Further, it is preferable that the upper opening of the curing pipe (second vertical pipe) 125 is opened at a position lower than the third floor of the building 10, for example.
Further, the upper opening of the curing pipe 125 is more preferably arranged on the second floor or lower of the building 10, for example, and further preferably arranged on the first floor.

Further, in this embodiment, the lower side of the curing pipe 125 is buried in the ground and is arranged so as to stand up from the ground.
Further, the curing pipe 125 is connected to the rainwater basin 160 via, for example, an elbow 126, a connecting pipe 127, and an elbow 128, and the drainage flowing down from the first vertical pipe 123 is discharged to the rainwater basin 160. There is.
Further, it is preferable that the elbow 126 and the lower opening of the first vertical pipe 123 are formed at a distance of 1 m or more, preferably 300 mm or more.

The material of the curing pipe (second vertical pipe) 125 can be arbitrarily set.
Further, the size (nominal diameter) and the flow path area of the curing pipe (second vertical pipe) 125 can be arbitrarily set. For example, the nominal diameter of the curing pipe 125 may be set to be 2 sizes or more larger than the nominal diameter of the first vertical pipe 123.
Further, the flow path area of the curing pipe 125 may be set to a large area difference of less than one size in nominal diameter with respect to the flow path area of the first vertical pipe 123, or may be set to an area difference larger than one size. You may.
Further, it is possible to arbitrarily set whether or not the curing pipe (second vertical pipe) 125 is concentric with the first vertical pipe 123, and the curing pipe 125 and the first vertical pipe 123 are arranged eccentrically. You may.

The branch pipe 150 is configured so that, for example, rainwater flowing into the branch pipe 150 from the large eaves 10c located on the third floor of the building 10 joins the first vertical pipe 123 at the merging portion 120T. The rainwater flowing into the branch pipe 150 is not limited to the rainwater flowing from the large eaves 10c, and for example, a part of the rainwater is provided outdoors by being provided on the outer periphery of the balcony or the roadway (for example, the building 10) provided in the building 10. It may be rainwater flowing in from an exposed lane).
In this embodiment, the confluence 120T is located, for example, on the third floor of the building 10, and the height from the ground surface is set to, for example, 10 m or less.

According to the rainwater drainage system (rainwater drainage pipe structure) 100 according to the first embodiment, the main pipe 122 is arranged on the upper side of the first vertical pipe 123 and on the lower side of the first vertical pipe 123 for curing. A pipe (second vertical pipe) 125 is provided, and the curing pipe 125 is formed with a nominal diameter of 125 A, is one size larger than the first vertical pipe 123, and has a flow path area larger than the first vertical pipe 123, so that the siphon phenomenon occurs. It is possible to prevent the pressure inside the main pipe 122 from rising to a positive pressure when the drainage flows down from the upper floor to the lower floor.
As a result, in the merging portion 120T, the drainage can be stably merged from the branch pipe 150 to the main pipe 222.

Further, according to the rainwater drainage system 100 according to the first embodiment, for example, in a confluence portion 120T formed on a lower floor below the third floor or 10 m or less from the ground, drainage from the branch pipe 150 is stabilized in the main pipe 122. Can be merged.
As a result, the branch pipe 150 can be connected to the main pipe 122 at a lower position or a lower floor of the building 10.

Further, according to the rainwater drainage system 100 according to the first embodiment, the merging portion 120T is formed in the middle of the first vertical pipe 123 in the height direction, and the curing pipe 125 is located below the merging portion 120T. Since the curing pipe 125 is arranged at a distance from the outer wall surface of the first vertical pipe 123, rainwater can be stably discharged to the rainwater basin 160 by a simple structure. In this way, even if the curing pipe 125 is located below the merging portion 120T, for example, the flow rate of the drainage merging from the branch pipe 150 to the merging portion 120T is 5 L / s (liter / sec). If the following is true, it has been confirmed that the drainage from the branch pipe 150 is surely merged with the main pipe 122.

Further, according to the rainwater drainage system 100 according to the first embodiment, by forming the confluence portion 120T at a height of 10 m or less from the ground surface, the building 10 can be arranged at an inconspicuous low position.
Further, according to the rainwater drainage system 100 according to the first embodiment, the confluence portion 120T can be formed on the third floor or lower of the building 10, so that the rainwater drainage system (rainwater drainage piping structure) 100 is designed. The above degree of freedom can be improved.

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

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

The rainwater drainage system 200 is configured so that the drainage flowing down from the upper floor and the drainage from the branch pipe 150 are merged at the merging portion 220T and drained to the rainwater basin 160.
Since the siphon type drainage member and the rainwater basin 160 are the same as the siphon type drainage member 110 and the rainwater basin 160 in the first embodiment, the description thereof will be omitted.

As shown in FIG. 5, the rainwater pipe main body 220 includes, for example, a horizontal pipe 121 and a main pipe (vertical pipe) 222.
Further, a merging portion 220T is formed in the main pipe (vertical pipe) 222 so that the drainage from the branch pipe 150 merges. The merging portion 220T is a joint that joins a portion of the main 222 located above the merging portion 220T and a portion located below the merging portion 220T. The merging portion 220T is formed of cheese (90 ° Y pipe), and one of the sockets of the merging portion 220T is connected to the branch pipe 150.
Since the horizontal pipe 121 is the same as that of the first embodiment, the same reference numerals are given and the description thereof will be omitted.

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

The first vertical pipe 223 is composed of, for example, a hard PVC circular straight pipe having a nominal diameter of 100 A, and is arranged along the vertical direction of the building.
Further, in this embodiment, the merging portion 220T is formed in the middle of the first vertical pipe 223 in the height direction.
Further, the lower end of the first vertical pipe 223 is connected to the second vertical pipe 225 via the increaser 222S.
The material and size (nominal diameter) of the first vertical pipe 223 can be arbitrarily set.

The second vertical pipe 225 is composed of, for example, a circular straight pipe made of hard vinyl chloride, has a larger flow path area than the first vertical pipe 223, and is arranged along the vertical direction of the building 10. ..
Specifically, the second vertical pipe 225 is formed to have a nominal diameter of 125 A, which is one size larger than, for example, the first vertical pipe 223.

The increase 222S is, for example, a diameter-expanding joint formed of a hard vinyl chloride resin, one end side (upper side) having a nominal diameter of 100A, and the other end side (lower side) having a nominal diameter of 125A. ..
Then, 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 100 A to a nominal diameter of 125 A.
The material forming the increaser 222S can be arbitrarily set.

Further, the height of the connecting portion (vertical pipe connecting portion) in which the increaser 222S is arranged can be arbitrarily set, but for example, it is preferably set to 10 m or less from the ground.
Further, the height of the incrementer 222S is preferably arranged on the third floor or lower of the building 10, more preferably on the second floor or lower, and is arranged on the first floor. Is even more preferable.

Further, in this embodiment, the lower side of the second vertical pipe 225 is buried in the ground and is connected to the rainwater basin 160 via, for example, an elbow 126, a connecting pipe 127, and an elbow 128.

The material of the second vertical pipe 225 can be arbitrarily set.
Further, the size (nominal diameter) and the flow path area of the second vertical pipe 225 can be arbitrarily set. For example, the nominal diameter of the second vertical pipe 225 may be set to be two sizes or more larger than the nominal diameter of the first vertical pipe 223.
Further, 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 an area difference larger than the two sizes. It may be set.

The branch pipe 150 is configured so that rainwater that has flowed into the branch pipe 150 from, for example, a large eaves 10c or the like is merged with the first vertical pipe 223 at the merging portion 220T.
In this embodiment, the confluence 220T is located, for example, on the third floor of the building 10, and the height from the ground surface is set to, for example, 10 m or less.

According to the rainwater drainage pipe structure (drainage pipe structure) 200 according to the second embodiment, the merging portion 220T is formed in the first vertical pipe 223, and the second vertical pipe 225 is on the lower side of the merging portion 220T. Since it is connected to the first vertical pipe 223 via the pipe, the pressure inside the pipe at the merging portion 220T becomes a negative pressure, and the drainage can be stably merged from the branch pipe 150 to the main pipe 222.

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

The rainwater drainage system (rainwater drainage piping structure) 300 is applied to, for example, an eight-story building 10.
Further, the rainwater drainage system 300 includes, for example, a siphon type drainage member (not shown), a rainwater pipe main body 320 that drains rainwater flowing from the siphon type drainage member toward the lower floor, and an intermediate floor (for example, the third floor). The branch pipe 150A connected to the confluence portion 320T of the rainwater pipe main body 320 is provided.
The rainwater drainage system 300 is configured to drain the drainage flowing down from the upper floor and the drainage merged from the branch pipe 150A to the rainwater basin 160 buried in the ground.
Since the siphon type drainage member and the rainwater basin 160 are the same as those in the first embodiment, the description thereof will be omitted.

As shown in FIG. 6, the rainwater pipe main body 320 includes, for example, a horizontal pipe 121 and a main pipe (vertical pipe) 322.
Further, a merging portion 320T is formed in the main pipe (vertical pipe) 322 so that the drainage from the branch pipe 150A merges. The merging portion 320T is a joint that joins a portion of the main pipe 322 located above the merging portion 320T and a portion located below the merging portion 320T. The merging portion 320T is formed of cheese (90 ° Y pipe), and one of the sockets of the merging portion 320T is connected to the branch pipe 150A.
Since the horizontal pipe 121 is the same as that of the first embodiment, the description thereof will be omitted.

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

The first vertical pipe 323 is composed of, for example, a hard PVC circular straight pipe having a nominal diameter of 100 A, and is arranged along the vertical direction of the building.
Further, in this embodiment, the incrementer 322S and the confluence portion 320T are connected to the lower end of the first vertical pipe 323 in this order.
Further, the first vertical pipe 323 is connected to the second vertical pipe 325 via the increaser 322S and the merging portion 320T.

Then, a branch pipe 150A is connected to the merging portion 320T.
The material and size (nominal diameter) of the first vertical pipe 323 can be arbitrarily set.

The second vertical pipe 325 is composed of, for example, a circular straight pipe made of hard vinyl chloride, has a larger flow path area than the first vertical pipe 322, and is arranged along the vertical direction of the building 10. ..
Specifically, the second vertical pipe 325 is formed to have a nominal diameter of 125 A, which is one size larger than, for example, the first vertical pipe 323.

The increase 322S is, for example, a diameter-expanding joint formed of a hard vinyl chloride resin, one end side (upper side) having a nominal diameter of 100A, and the other end side (lower side) having a nominal diameter of 125A. ..
Then, the first vertical pipe 323 and the second vertical pipe 325 are connected via the merging portion 320T to form a portion where the flow path area is expanded from the nominal diameter of 100A to the nominal diameter of 125A in the main pipe 322. ..
The material forming the increaser 322S can be arbitrarily set.

Further, the height of the connecting portion (vertical pipe connecting portion) in which the increaser 322S is arranged can be arbitrarily set, but for example, it is preferably arranged at 10 m or less from the ground.
Further, the height of the incrementer 322S is preferably arranged on the third floor or lower of the building 10, for example, and more preferably arranged on the second floor or lower of the building 10. It is even more preferable to be located on the floor.

Further, in this embodiment, the lower side of the second vertical pipe 325 is buried in the ground and is connected to the rainwater basin 160 via, for example, an elbow 126, a connecting pipe 127, and an elbow 128.

The material of the second vertical pipe 325 can be arbitrarily set.
Further, the size (nominal diameter) and the flow path area of the second vertical pipe 325 can be arbitrarily set. For example, the nominal diameter of the second vertical pipe 325 may be set to be two sizes or more larger than the nominal diameter of the first vertical pipe 323.
Further, 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 with an area difference of less than one size in nominal diameter, or an area difference larger than one size. May be set to.

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

According to the rainwater drainage system (rainwater drainage pipe structure) 300 according to the third embodiment, the merging portion 320T is formed in the second vertical pipe 325, and the second vertical pipe 325 is arranged above the merging portion 320T. Since it is connected to the first vertical pipe 323 via the increase 320S, the pressure inside the pipe at the merging portion 320T becomes a negative pressure, and the drainage can be stably merged from the branch pipe 150 to the main pipe 322.
Further, since the flow path area in the main pipe 322 is already large at the merging portion 320T, the flow rate of the drainage merging at the merging portion 320T can be increased. In this case, even if the flow rate of the drainage merging from the branch pipe 150A to the merging portion 320T is 5 L / s (liter / sec) or more, the drainage from the branch pipe 150 is surely merged with the main pipe 122. Has been confirmed.

<Fourth Embodiment>
Hereinafter, the rainwater drainage system (rainwater drainage piping structure) according to the fourth embodiment of the present invention will be described with reference to FIGS. 7 to 9.
FIG. 7 is a conceptual diagram illustrating an example of a schematic configuration of the rainwater drainage system according to the fourth embodiment. Further, FIG. 8 is a vertical cross-sectional view illustrating 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.

In FIGS. 7 to 9, reference numeral 10A is a building, reference numeral 100A is a rainwater drainage system (rainwater drainage pipe structure), reference numeral 110 is a siphon type drainage member, reference numeral 120 is a rainwater pipe body, and reference numeral 121 is a horizontal pipe. Reference numeral 122 indicates a main pipe, reference numeral 123 indicates a first vertical pipe, reference numeral 125 indicates a curing pipe (second vertical pipe), and reference numeral 150 indicates a branch pipe.

As shown in FIG. 7, the rainwater drainage system (rainwater drainage pipe structure) 100A is applied to, for example, an 8-story (for example, height 24 m) building 10A.
The building 10A can be applied to, for example, a factory or a shopping center having a height of 20 m or more.

Further, the rainwater drainage system 100A includes, for example, a rainwater pipe at a siphon type drainage member 110, a rainwater pipe main body 120 that drains rainwater flowing from the siphon type drainage member 110 toward a lower floor, and a confluence portion 120T on an intermediate floor. It includes a branch pipe 150 connected to the main body 120.
The rainwater drainage system 100A is configured to drain the drainage flowing down from the upper floor and the drainage merged from the branch pipe 150 to the rainwater basin 160 (see the first embodiment) buried in the ground.

As shown in FIGS. 8 and 9, the siphon type drainage member 110 is integrated with, for example, a base plate portion 111 formed in a substantially circular shape and having a circular through hole 110H formed in the central portion, and the upper surface of the base plate portion 111. It includes a plurality of vertical ribs 112 that are formed and arranged upward and spaced apart from each other in the circumferential direction, and a tubular portion 113 that extends downward from the peripheral edge of the through hole 110H.

Further, the base plate portion 111, the vertical rib 112, and the tubular portion 113 are integrally formed by casting a metal material such as an aluminum alloy, cast iron, or stainless steel, for example.
Further, the siphon type drainage member 110 is arranged (for example, buried) on the upper surface of the rooftop slab 15, for example.

The vertical rib 112 is, for example, formed in a substantially U shape in a plan view, and a U-shaped bottom portion (curved portion of the folded portion) is arranged on the flow hole 111H side.
Further, in the vertical rib 112, for example, a pair of rising wall portions that are formed from the bottom of the U-shape toward the opening side and face each other extend radially outward from the center of the flow hole 111H. It is formed so that the distance between them becomes wider toward the outside in the radial direction.

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

Further, the siphon type drainage member 110 suppresses the formation of an air column near the center of the rainwater (drainage) that has flowed into the cylinder portion 113 due to the siphon phenomenon, so that the rainwater can efficiently flow downstairs. It has become.
The configuration of the siphon type drainage member 110 is an example, and the configuration can be arbitrarily set.

Hereinafter, examples according to the present invention will be described with reference to FIGS. 10 to 13.
In Examples, the following verification test 1 and verification test 2 were carried out using Comparative Examples, Examples 1 to 5 of the present invention, and the effect of the rainwater drainage system was confirmed.

In the embodiment, the rainwater drainage system (rainwater drainage piping structure) shown in FIGS. 10 and 11 was used.
FIG. 10 is a conceptual diagram for explaining the schematic configuration of the rainwater drainage system used in the embodiment, and FIG. 11 is a conceptual diagram for explaining the specific configuration of the rainwater drainage system in the embodiment.
The rainwater drainage system (rainwater drainage pipe structure) was composed of pipes made of a transparent resin material.
Further, as shown in FIG. 10, the rainwater drainage system is installed in an experimental facility (building) having 8 floors above ground.

In the experimental facility (building), the height of the first floor to the second floor is set to 3.0 m from the GL (ground), and the height from the second floor to the eighth floor is set to 2.8 m, respectively. Has been done.
The siphon type drainage member is installed 1.0 m from the floor surface on the 8th floor.
Further, in the rainwater drainage system, a pressure sensor for measuring the pressure inside the main pipe is installed at the pressure measurement position shown in FIG. 10 of the main pipe (vertical pipe). Further, as shown in FIG. 10, an expansion joint was arranged in the middle of the main pipe.

[Comparative example]
In the comparative example, as shown in FIG. 11, a branch pipe was connected at an intermediate position in the height direction of the main pipe where the flow path area arranged in the vertical direction did not change, and a merging portion was installed.
Main: Nominal diameter 100A
Branch pipe: 90 ° Y pipe with nominal diameter of 100A Confluence: GL + 6.5m (3rd floor floor surface + 1700mm)

[Example 1 of the present invention]
The first embodiment of the present invention corresponds to the first embodiment, and uses a first vertical pipe arranged on the upper side and a curing pipe (second vertical pipe) arranged on the lower side of the first vertical pipe. 1 The lower part of the vertical pipe was inserted into the curing pipe to form the 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 install a merging portion.
1st vertical pipe: Nominal diameter 100A
Curing pipe (second vertical pipe): Nominal diameter 125A
Curing pipe (second vertical pipe): Nominal diameter 125A
Height of connection between 1st vertical pipe and curing pipe (2nd vertical pipe): GL + 1000m
Branch pipe: 90 ° Y pipe with a nominal diameter of 100 A A gap was provided between the first vertical pipe and the curing pipe (second vertical pipe).
Confluence: GL + 5.5m (3rd floor floor + 700mm)

[Example 2 of the present invention]
Example 2 of the present invention corresponds to the first embodiment and has the same configuration as that of Example 1 of the present invention. Specifically, the height of the merging portion is different from that of Example 1 of the present invention.
1st vertical pipe: Nominal diameter 100A
Curing pipe (second vertical pipe): Nominal diameter 125A
Height of connection between 1st vertical pipe and curing pipe (2nd vertical pipe): GL + 1000m
Branch pipe: 90 ° Y pipe with a nominal diameter of 100 A A gap was provided between the first vertical pipe and the curing pipe (second vertical pipe).
Confluence: GL + 1.86m (2nd floor floor + 860mm)

[Example 3 of the present invention]
Example 3 of the present invention corresponds to the second embodiment, and uses a first vertical pipe arranged on the upper side and a second vertical pipe arranged on the lower side of the first vertical pipe to form a first vertical pipe. The main pipe was constructed by connecting the second vertical pipe with an increaser. Then, a branch pipe was connected to the first vertical pipe above the second vertical pipe to install a merging portion.
1st 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 Confluence: GL + 2.86m (2nd floor floor surface + 1860mm)

[Example 4 of the present invention]
Example 4 of the present invention corresponds to the second embodiment and has the same configuration as that of Example 3 of the present invention. Specifically, the connection joint used at the confluence is different from that of Example 3 of the present invention.
1st 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 Confluence: GL + 2.86m (2nd floor floor surface + 1860mm)

[Example 5 of the present invention]
Example 5 of the present invention corresponds to the third embodiment, and uses a first vertical pipe arranged on the upper side and a second vertical pipe arranged on the lower side of the first vertical pipe to form a first vertical pipe. The main pipe was constructed by connecting the second vertical pipe with an increaser. Then, a branch pipe was connected to the second vertical pipe in the middle of the second vertical pipe to install a merging portion.
1st vertical pipe: Nominal diameter 100A
Second vertical pipe: Nominal diameter 125A
Increaser height: GL + 450mm
Branch pipe: Omagari 90 ° Y pipe (LT pipe) with a nominal diameter of 100A
Confluence: GL + 2.86m (2nd floor floor + 1860mm)

(1) Verification test 1
Hereinafter, the verification results of the verification test 1 in the examples will be described with reference to FIG.
FIG. 12 is a pressure distribution diagram for explaining the pressure inside the main pipe of the rainwater drainage system according to the verification test 1 in the embodiment.
Using Comparative Examples, Examples 1 to 3 of the present invention, rainwater was supplied from the siphon type drainage member to the main pipe via a horizontal pipe, and the change in the pressure inside the main pipe was verified.

In the verification test 1, as shown in FIG. 12, in both Comparative Example and Examples 1 to 3 of the present invention, the pressure inside the pipe of the drainage supplied from the siphon drainage member is a negative pressure on the upper floor (for example, about 60 kPa on the floor surface of the 8th floor). ), And there is no big difference.
However, in the comparative example, the pressure inside the pipe rises linearly as it goes down to the lower floors, the pressure inside the pipe becomes zero near the floor surface (GL + about 6 m) on the third floor, and the pressure inside the pipe becomes positive on the first and second floors. To rise.

On the other hand, in Examples 1 to 3 of the present invention, as shown in FIG. 12, although the pressure in the pipe rises to the same extent as in the comparative example on the upper floors above the fifth floor, compared with the comparative example on the lower floors below the fifth floor. The pressure inside the pipe rises slowly.
Then, it was confirmed that in Examples 1 to 3 of the present invention, the pressure inside the main pipe was maintained as a negative pressure even when the floor surface was lowered to the second floor.
Therefore, in Examples 1 to 3 of the present invention, the drainage from the branch pipe can be stably merged with the main pipe.

(2) Verification test 2
Hereinafter, the verification results of the verification test 2 in the examples will be described with reference to FIG.
FIG. 13 is a diagram for explaining the confluence flow rate of the branch pipes of the rainwater drainage system according to the verification test 2 in the embodiment. In FIG. 13, ◯ indicates that the merging is possible smoothly, and ◯ Δ indicates that the merging is possible although the backflow occasionally occurs.
In the verification test 2, using Examples 3 to 5 of the present invention, rainwater is supplied from the siphon type drainage member to the main pipe via a horizontal pipe, and the drainage is merged from the branch pipe to the main pipe while changing the flow rate. By visually observing the merging state of the drainage at the merging part, the effluent flow rate that can be merged from the branch pipe to the main pipe was verified and evaluated.
The flow rate of rainwater flowing from the siphon type drainage member to the main pipe is 40 L / S.

In the verification test 2, as shown in FIG. 13, when the drainage flow rate from the branch pipe is 1 L / S to 2 L / S, it can be seen that both Examples 3 to 5 of the present invention stably join the main pipe.
On the other hand, in Example 3 of the present invention, as shown in FIG. 13, when the drainage flow rate from the branch pipe is 3 L / S, it becomes difficult to merge as compared with the case of 1 L / S to 2 L / S.
Further, in Example 4 of the present invention, it can be said that the drainage can be stably merged into the main pipe even when the drainage flow rate from the branch pipe is 5 L / S.
Further, in Example 5 of the present invention, it can be said that the drainage can be stably merged into the main pipe even when the drainage flow rate from the branch pipe is 10 L / S.
As described above, it was confirmed that Examples 4 and 5 of the present invention are more advantageous than Example 3 of the present invention in that the drainage flow rate that can be merged from the branch pipe is large.

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.

In the above embodiment, in the rainwater drainage system (rainwater drainage pipe structure) 100, 200, 300, the first vertical pipes 123, 223, and 323 are formed with a nominal diameter of 100 A, and the curing pipe 125 and the second vertical pipes 225 and 325. Has been described in the case where the first vertical pipe is formed to have a nominal diameter of 125 A and the first vertical pipe is formed one size larger in nominal diameter than the curing pipe and the second vertical pipe. The flow path cross-sectional area or nominal diameter of the curing pipe 125 and the second vertical pipes 225 and 325 can be arbitrarily set.

For example, the flow path area of the curing pipe 125 second vertical pipe 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 pipe 123, 223, 323. The flow path area difference may be set to be larger than one size.
Further, the nominal diameters of the curing pipe 125 and the second vertical pipes 225 and 325 may be set large with an area difference of less than one size in terms of the nominal diameter with respect to the flow path area of the first vertical pipe 123, or one size. The area difference may be set to be larger than.

Further, in the above embodiment, for example, the case where the upper opening of the curing pipe 125 in the rainwater drainage system 100 is formed at 2 m or less from the ground has been described, but the height at which the upper opening of the curing pipe 125 is formed is described. Can be arbitrarily set, and may be formed at a position higher than 2 m, for example.

Further, in the above embodiment, the case where the incrementers 222S and 222S are arranged on the floor of 10 m or less from the ground and the third floor or less of the building 10 has been described, but the height at which the incrementers 222S and 222S are arranged. The direction position can be set arbitrarily.

Further, in the above embodiment, the case where the merging portions 120T, 220T, and 320T are formed on the third floor or lower or at a position of 10 m or less in height has been described. The merging portions 120T, 220T, and 320T may be formed at a position higher than 10 m.

Further, in the above embodiment, the case where the merging portion from the branch pipes 150 and 150A to the main pipes 122, 222 and 222 is composed of cheese (90 ° Y pipe) has been described. Various joints may be applied without being limited to cheese, such as a large curved 90 ° Y pipe (LT pipe).

Further, in the above embodiment, the case where the increaser 222S and 322S is used when the diameter is expanded from the first vertical pipe 223, 323 to the second vertical pipe 225, 325 has been described, but various diameter-expanded joints are applied. Alternatively, the diameter may be increased by using a Y-tube such as cheese having a small diameter on the upper side (one end side) and a large diameter on the lower side (the other end side).

Further, in the above embodiment, the case where the siphon type drainage member 110 is installed on the roof has been described, but for example, the siphon type drainage member 110 may be arranged on a roof, a balcony, or the like without being limited to the roof.

In addition, it is possible to replace the constituent elements in the above-described embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention, and the above-described embodiments may be appropriately combined and applied.

10, 10A Building 100, 100A, 200, 300 Rainwater drainage system (rainwater drainage piping structure)
20, 110 Siphon type drainage member 120, 220, 320 Rainwater piping body 120T, 220T, 320T Confluence 121 Horizontal pipe 122, 222, 222 Main pipe 123, 223, 323 First vertical pipe 125 Curing pipe (second vertical pipe)
150, 150A Branch pipe 160 Rainwater basin 222S, 322S Increase 225, 325 Second vertical pipe

Claims (7)

It is a rainwater drainage piping structure that is placed in a building and drains rainwater from the upper floors to the lower floors.
Siphon type drainage members located on the upper floors and
A main that allows rainwater flowing in from the siphon type drainage member to flow down from the upper floor to the lower floor.
A branch pipe that is connected to a confluence located in the middle of the main in the height direction and allows drainage to flow into the confluence from the outside.
With
The main is
A first vertical pipe arranged on the upper side and connected to the siphon type drainage member, and a second vertical pipe arranged on the lower side of the first vertical pipe and having a larger flow path area than the first vertical pipe.
Rainwater drainage piping structure characterized by being equipped with. The rainwater drainage piping structure according to claim 1.
The merging portion is formed in the first vertical pipe and is formed.
The second vertical pipe is
A rainwater drainage pipe structure characterized by being a curing pipe located below the merging portion and arranged at intervals from the outer wall portion of the first vertical pipe. The rainwater drainage piping structure according to claim 1.
The merging portion is formed in the first vertical pipe and is formed.
The second vertical pipe is
A rainwater drainage pipe structure characterized in that it is connected to the first vertical pipe via an increaser arranged below the confluence. The rainwater drainage piping structure according to claim 1.
The merging portion is formed in the second vertical pipe and is formed.
The second vertical pipe is
A rainwater drainage pipe structure characterized in that it is connected to the first vertical pipe via an increaser arranged above the confluence. The rainwater drainage pipe structure according to any one of claims 1 to 4.
The nominal diameter of the second vertical pipe is
A rainwater drainage pipe structure characterized in that it is set to be one size or more larger than the nominal diameter of the first vertical pipe. The rainwater drainage pipe structure according to any one of claims 1 to 5.
The confluence
A rainwater drainage pipe structure characterized by being located 10 m or less from the ground surface. The rainwater drainage pipe structure according to any one of claims 1 to 5.
The confluence
A rainwater drainage piping structure characterized by being located on the third floor and below.

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