JP2023076753A - drainage system - Google Patents

Abstract

To provide a drainage system capable of reducing the inflow of foreign matter into a drainage port.SOLUTION: A drainage system 1 includes a metallic lid 10, a catch basin 20, and a siphon drain member 30. The catch basin 20 has an opening 20a and a bottom face 53b. The metallic lid 10 is placed over the opening 20a. The bottom face 53b is located below the opening 20a to stop the water flowing from opening 20a. The siphon drain member 30 has a lid member 31 and a drainage port 34a and is positioned in the catch basin 20. The siphon drain member 30 induces a siphon phenomenon in the water drained by a pipe 90 connected to the drainage port 34a. The drainage port 34a is formed facing the lid member 31 and is disposed above the bottom face 53b.SELECTED DRAWING: Figure 2

Description

The present invention relates to drainage systems.

BACKGROUND ART Conventionally, rainwater catch basins are arranged in gutters of bridges to drain rainwater (see, for example, Patent Document 1).

The rainwater basin shown in Patent Document 1 includes a main body, an upper basin arranged on the upper part of the main body, and a metal lid arranged on the upper basin, and a drain pipe is connected to the lower end of the main body. . Rainwater flowing from the metal lid flows into the drainage pipe via the rainwater basin.

JP 2016-156243 A

However, in the rainwater drainage of the conventional configuration, foreign matter moving on the road surface along with rainwater drainage also flows into the drainage pipeline, and the foreign matter may stay in the pipeline and cause clogging. For this reason, it is necessary to periodically inspect the inside of the pipes, and when clogging occurs, it is necessary to perform high-pressure washing, but there is a problem that it is difficult to confirm the clogged portion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drainage system capable of reducing the inflow of foreign matter into a drainage port.

To achieve the above object, a drainage system according to a first invention includes a metal lid, a drainage basin, and a drainage member. The drainage basin has an opening and a water stop surface. A metal lid is placed in the opening. The water stop surface is arranged below the opening and stops water flowing from the opening. The drainage member has a cover member and a drainage port, is arranged inside the drainage basin, and induces the occurrence of a siphon phenomenon in the water drained by the pipe connected to the drainage port. The drain port is formed facing the lid member. The drain port is arranged above the cut-off surface.

As a result, foreign matter can be accumulated in the space between the drain port and the water stop surface, so that the inflow of foreign matter into the drain port can be reduced.

In addition, a siphon phenomenon can be generated, and high flow rate drainage can be realized with a small diameter. For this reason, it is possible to use piping with a smaller diameter than before, which reduces the weight and improves work efficiency.

A drainage system according to a second aspect of the invention is the drainage system according to the first aspect of the invention, wherein the drainage basin further has a narrowed portion arranged below the opening and having an area smaller than that of the opening. The drain is located between the constriction and the opening.

As a result, the foreign matter that has flowed into the throttle from the opening along with the rainwater accumulates in the space of the throttle, so that the inflow of foreign matter into the drain port can be reduced.

A drainage system according to a third invention is the drainage system according to the first or second invention, wherein the drainage member has a lower basin and an upper basin. The lower masu has a constricted portion. The upper measure has an opening and is arranged above the lower measure.

Thereby, the drainage basin can be formed by at least two members, the upper basin and the lower basin. Also, the materials of the upper and lower containers can be changed, for example, the upper container can be made of metal and the lower container can be made of FRP (Fiber Reinforced Plastics).

A drainage system according to a fourth invention is the drainage system according to the first or second invention, wherein the drainage basin has a bottom surface forming a water stop surface.
As a result, rainwater can be stopped at the bottom surface of the drainage basin.

A drainage system according to a fifth aspect of the invention is the drainage system according to the second aspect of the invention, wherein the drainage basin has a water stop member. The narrowed portion has a tubular shape extending toward the water stop surface. The water stop member covers the tip of the throttle portion. A water stop member forms a water stop surface.
A water stop surface can be formed by such a water stop member, and rainwater can be stopped.

A drainage system according to a sixth aspect of the invention is the drainage system according to the second aspect of the invention, wherein the drainage basin has an area perpendicular to the opening that gradually decreases from the opening toward the throttle. formed.
As a result, the rainwater that has flowed into the opening can be vigorously flowed into the throttle.

A drainage system according to a seventh invention is the drainage system according to any one of the first to sixth inventions, wherein the water cutoff surface is penetrated by a pipe connected to the drainage port of the drainage member.
As a result, the space around the pipe is used as a space for storing foreign matter.

A drainage system according to an eighth invention is the drainage system according to any one of the first to seventh inventions, wherein the drainage member has an opening to the pipe, and the opening is connected to the drainage port. The lid member is arranged so as to close the opening when viewed from above in the vertical direction, and the projected area of the lid member with respect to a plane orthogonal to the vertical direction is set larger than the projected area of the opening.

Thereby, even when the drainage member is obliquely arranged, the siphon phenomenon can be generated.

A drainage system according to a ninth invention is the drainage system according to any one of the first to eighth inventions, and is provided in a side ditch of a bridge.

As a result, rainwater falling on the bridge can be drained efficiently.

ADVANTAGE OF THE INVENTION According to this invention, the drainage system which can reduce the inflow of a thing to a drainage port can be provided.

The figure which shows the state which installed the drainage system of embodiment concerning this invention in the bridge. 1 is a schematic cross-sectional view showing the configuration of a drainage system according to an embodiment of the present invention; FIG. Fig. 3 is an exploded perspective view showing the metal lid and the drainage basin 20 of Fig. 2; FIG. 3 is a perspective view showing the siphon drain member of FIG. 2; FIG. 3 is a perspective sectional view showing the siphon drain member of FIG. 2; FIG. 6 is a front view of FIG. 5; The figure which shows the structure of the drainage system of a present Example. The figure which shows an example of the piping connection structure of the drainage system of a present Example. (a) An exploded view of the piping connection structure of FIG. 8, (b) A perspective view of the cap of FIG. 9(a) viewed from the bottom side. It is a figure which shows the structure of the drainage system of a comparative example. FIG. 4 is a table showing the results of Examples 1 and 2 and Comparative Examples 1 to 3; FIG. 5 is a schematic cross-sectional view showing the configuration of a drainage system in a modified example of the embodiment according to the present invention;

A drainage system according to an embodiment of the present invention will be described below with reference to the drawings.
<Configuration>
(Outline of drainage system 1)
FIG. 1 is a diagram showing a state in which a drainage system 1 of an embodiment according to the present invention is installed on a bridge. As shown in the figure, a plurality of drainage systems 1 of this embodiment are arranged along the side ditches of the bridge 200 . Rainwater falling on the bridge 200 flows into the drainage system 1 and is drained outside the bridge 200 .

FIG. 2 is a schematic cross-sectional view showing the configuration of the drainage system 1 of this embodiment.
As shown in FIG. 2 , the drainage system 1 of this embodiment includes a metal lid 10 , a drainage basin 20 and a siphon drain member 30 .

(metal lid)
FIG. 3 is an exploded perspective view of the metal lid 10 and the drainage basin 20. As shown in FIG.

The metal lid 10 is a metal lid having a plurality of holes. The plurality of holes may be of any shape as long as they do not interfere with the inflow of rain. For example, they may be formed in a mesh shape like a grating, or may be formed with a plurality of rectangular holes. The metal lid 10 is supported by a drainage basin 20, and rainwater flows into the drainage basin 20 from the metal lid 10. - 特許庁Although the metal lid 10 has a rectangular shape as an example in the present embodiment, it is not limited to this and may have a polygonal shape other than a square shape, a circle, or an ellipse.

(drain basin)
The drainage basin part 20 has an upper basin 21 , a lower basin 22 and a height adjusting part 23 . The upper measure 21 is made of metal and is a frame arranged around the metal lid 10 . The inner side of the upper basin 21 corresponds to the opening 20a of the drainage basin 20, and the metal lid 10 is arranged.

The upper measure 21 has a side wall 41 and a lid placement portion 42 . Side wall 41 is formed to surround metal lid 10 . The lid mounting portion 42 is formed substantially perpendicular to the side wall 41 from the lower end of the side wall 41 toward the inside. The metal lid 10 is mounted on the lid mounting portion 42 .

The lower trough 22 is made of FRP, for example, and has side walls 51 , upper trough support portions 52 , constricted portions 53 , connecting portions 54 , and form pipes 55 .

The side walls 51 are formed to surround the upper chamber 21 . The upper container support portion 52 is formed generally perpendicular to the side wall 51 toward the inside from the lower end of the side wall 51 . The upper measure 21 is supported by the upper measure supporting portion 52 . A height adjusting portion 23 for adjusting the height position of the upper container 21 with respect to the lower container 22 is provided on the upper container supporting portion 52 and the lid placing portion 42 .

The narrowed portion 53 has a columnar appearance and is provided below the upper cup support portion 52 . The narrowed portion 53 has a cylindrical portion 53a and a bottom surface 53b. A narrowed upper portion 53c, which is the upper end of the cylindrical portion 53a, is connected to the upper container support portion 52 by a connection portion 54, which will be described later. The bottom surface 53b is arranged so as to cover the lower end, which is the tip of the cylindrical portion 53a.

In addition, as shown in FIG. 2, the narrowed portion 53 is arranged on one side of the left and right sides of the center of the opening 20a in the left-right direction. 53 d of through-holes are formed in the bottom face 53b, and the piping 90 penetrated by 53 d of through-holes is provided.

As the pipes (including the pipe 90) used in the drainage system 1 of the present embodiment, pipes having a diameter of 75A to 125A, for example, can be used. The pipe 90 is arranged substantially perpendicular to the bottom surface 53 b and its upper end is positioned inside the drainage basin 20 . The bottom surface 53b functions as a water stop surface that stops rainwater from leaking downward from the drainage basin 20. As shown in FIG. The bottom surface 53b corresponds to the lower end of the drawn portion 53, that is, the lower portion of the drawn portion. The space between the bottom surface 53b and the pipe 90 may be filled with a waterproofing agent or the like, or a cap-shaped member may be used as in an embodiment described later.

The connecting portion 54 connects the upper container support portion 52 and the narrowed portion 53 . The connection portion 54 connects the inner end of the upper cup support portion 52 to the upper end of the tubular portion 53 a of the drawn portion 53 . The connecting portion 54 is formed so that the cross-sectional area in the direction perpendicular to the opening 20 a gradually decreases from the upper container support portion 52 toward the narrowed portion 53 .

The mold tube 55 is cylindrical and arranged around the cylindrical portion 53 a of the constricted portion 53 . The form pipe 55 protects the constricted portion 53 and the like from the concrete 201 .

The height adjuster 23 adjusts the height position of the upper measure 21 with respect to the lower measure 22 . The height adjuster 23 has a bolt 61 and a nut 62 . The bolt 61 is inserted into a through hole formed in the upper container support portion 52 . The bolt 61 is arranged substantially perpendicular to the upper container support portion 52 . The head 61a of the bolt 61 abuts the lid mounting portion 42 of the upper container 21 from below. The nut 62 is fixed to the upper container support portion 52 so as to be coaxial with the through hole. A bolt 61 is inserted through the nut 62 . By changing the amount of screwing of the bolt 61 into the nut 62, the height of the upper chamber 21 relative to the lower chamber 22 can be changed. The height adjusting portion 23 may be provided on all of the opposed long sides and the opposed short sides of the upper measure support portion 52, or may be provided on only one of them.

Here, as shown in FIG. 2, concrete 201 is provided up to the upper end of the lower basin 22, and pavement 202 is provided above the concrete 201. As shown in FIG. The upper end of the pavement 202 and the upper end of the upper basket 21 are generally aligned. The height adjustment part 23 can adjust the position of the upper basket 21 with respect to the lower basket 22 so as to match the thickness of the pavement 202 .

(siphon drain member)
The siphon drain member 30 (an example of a drainage member) induces the occurrence of a siphon phenomenon in the water drained to the pipe 90 connected thereto. The siphon drain member 30 is a drainage member having a high drainage function for improving the ability to drain rainwater that has flowed into the drainage basin 20 .

4 is a perspective view showing the siphon drain member 30. FIG. 5 is a perspective cross-sectional view of the siphon drain member 30. FIG. 6 is a front view of FIG. 5. FIG.

The siphon drain member 30 can be made by injection molding using synthetic resin such as rigid vinyl chloride resin, polycarbonate, ABS, and AES. In addition, the material is not limited to synthetic resin, and may be made of cast iron using a mold.

The siphon drain member 30 has a lid member 31 , a mounting cylinder 32 and a plurality of vertical ribs 33 .

The lid member 31 is plate-shaped and formed in a disk shape. The mounting tube 32 is formed in a tubular shape. The respective central axes of the lid member 31 and the mounting cylinder 32 are arranged on a common axis and coincide with each other in the vertical direction. This common axis is referred to as a drain axis O, the attachment cylinder 32 of the siphon drain member 30 along the direction of the drain axis O is referred to as the lower side, and the lid member 31 side is referred to as the upper side. A direction perpendicular to the drain axis O in a plan view of the siphon drain member 30 from the direction of the drain axis O is defined as a radial direction, and a direction rotating around the drain axis O is defined as a circumferential direction.

The mounting cylinder 32 has a cylinder portion 71 forming the drop opening portion 34 and a plate-like collar portion 72 extending radially outward from the upper end of the cylinder portion 71 . A connection portion 32a on the inner surface side where the cylindrical portion 71 and the flange portion 72 are connected is formed in a bellmouth shape with a tapered surface or a curved surface. When the connection portion 32a is curved, the radius of curvature of the cross section in the direction parallel to the drain axis O is preferably 5 mm to 20 mm.

The drain port 34 is a portion for draining rainwater, and the opening at the upper end of the drain port 34 (which can be said to be the inside of the upper end of the cylindrical portion 71) is a drain port 34a. The drain port 34 a can also be said to be inside the flange portion 72 . The distance from the drain port 34 a to the lid member 31 is substantially the same as the distance from the collar portion 72 to the lid member 31 . In the direction along the drain axis O, the positions of the drain port 34a and the collar portion 72 are generally aligned.

The opening 34b of the drop port portion 34 is located below the drain port 34a and has a constant diameter, and the opening diameter of the opening 34b is indicated as R1 (see FIG. 6). The area of the opening 34b with the opening diameter R1 is defined as the opening area of the drop opening 34. As shown in FIG. The opening diameter R1 corresponds to the inner diameter of the cylindrical portion 71, and the opening area of the drop opening portion 34 corresponds to an area having the inner diameter of the cylindrical portion 71 as a diameter. Also, the connection portion 32a gradually increases the diameter from the opening 34b toward the drain port 34a.

Also, in the present embodiment. Since the drain axis O, which is the central axis of the siphon drain member 30, is aligned in the vertical direction, the area of the lid member 31 and the opening area of the drop opening 34 are the projections of the lid member 31 onto a plane perpendicular to the vertical direction. area and the projected area of the opening of the drop opening 34 . In addition, in the present embodiment, the outer diameter dimension of the lid member 31 and the outer diameter dimension of the flange portion 72 are formed to be substantially the same.

The siphon drain member 30 is arranged, for example, by inserting the cylindrical portion 71 into the inside of the pipe 90 from above.

As shown in FIGS. 4 and 5, the portion formed between the outer peripheral edge 31a of the lid member 31 and the outer peripheral edge 72a of the collar portion 72 is an inflow opening through which rainwater flows into the drain port 34a of the drop port portion 34. 30a (see arrow B in FIG. 5). The size and height of the lid member 31 are adjusted so that the area of the inflow opening 30a is larger than the area of the opening 34b of the drop opening 34 (the portion of the diameter R1).

The plurality of vertical ribs 33 connect the upper surface 72d of the flange portion 72 of the mounting cylinder 32 and the outer peripheral portion of the lower surface 31c of the lid member 31, as shown in FIG. The cover member 31 is supported from below by a plurality of vertical ribs 33, and is supported at a position where a predetermined height H1 is secured from the mounting cylinder 32, as shown in FIG. A plurality of vertical ribs 33 are provided in the inflow opening 30a, are formed along the radial direction in plan view, and are formed to intersect the circumferential direction. The vertical ribs 33 have the function of rectifying rainwater flowing into the drop opening 34 from the inflow opening 30a. In this embodiment, six vertical ribs 33 are formed, and the six vertical ribs 33 are provided at equal intervals (approximately 60 degree intervals) around the drain axis O. It is not limited.

The lid member 31 is arranged so as to close the opening 34b of the drop opening 34 when viewed from above in the vertical direction. Also, the area of the lid member 31 is set larger than the opening area of the opening 34b of the drop opening 34 (portion of diameter R1). In this embodiment, the center of the cover member 31 and the center of the opening of the drop opening 34 are aligned in the vertical direction. Specifically, if the cover area of the lid member 31 is the same as the opening area of the drop opening 34, the opening 34b of the drop opening 34 cannot be closed when viewed from the vertical direction. A gap (air core due to vortex flow) for air to enter between is generated.

Therefore, it is preferable that the projected area of the lid member 31 with respect to a plane perpendicular to the vertical direction is set larger than the projected area of the opening 34b of the drop opening 34. As shown in FIG.

The lid diameter R2 or the minimum width dimension of the lid member 31 is larger than the opening diameter R1 of the drop opening 34 (diameter R1 of the opening 34b) and 245% or less of the opening diameter R1. Further, when the height from the outer peripheral edge 72a of the collar portion 72 of the lid member 31 is H1 and the opening diameter is R1, the value of R1/H1 satisfies the range of 1.3 to 8.0, and H1 is 10. ∼60 mm, and the opening area is preferably 30 cm 2 or more and 190 cm 2 or less.

The upper surface 31b of the lid member 31 is provided with gripping ribs 35 that protrude upward and are arranged at intervals in the circumferential direction. The gripping rib 35 is gripped by an operator when connecting the siphon drain member 30 to the pipe 90 .

(Position of siphon drain member in drainage basin)
Next, the position of the siphon drain member 30 inside the drainage basin 20 will be described.

In this embodiment, as shown in FIG. 2, the drain port 34a of the siphon drain member 30 is arranged at a position higher than the bottom surface 53b.

Thereby, as shown in FIG. 2, a space S is formed between the flange portion 72 and the bottom surface 53b. This space S (see the dot portion in FIG. 2) functions as a dust collecting portion, and the space S collects foreign matter that flows in together with rainwater.

Further, in the present embodiment, the siphon drain member 30 is arranged so that the drain port 34a is located above the narrowed upper portion 53c (indicated by position P1), which is the upper end of the narrowed portion 53. As shown in FIG. This allows the entire narrowed portion 53 to function as a dust collecting portion. Furthermore, it is not necessary to insert a hand into a narrow place such as the constricted portion 53 to grip the gripping rib 35, and the siphon drain member 30 and the pipe 90 can be easily connected.

<Action>
Rainwater falling on the bridge 200 flows from the metal lid 10 along the connecting portion 54 and into the throttle portion 53 as shown in FIG. 2 (see arrow A). Foreign matter that flows in together with rainwater is stored in the space S, and when the water level exceeds the collar portion 72, the excess rainwater flows into the drain port 34a and is drained from the pipe 90. - 特許庁At this time, a siphon phenomenon is induced by the siphon drain member 30, and rainwater can be drained efficiently even with a thin pipe.

Also, by periodically removing the dust accumulated in the space S, the frequency of high-pressure washing can be reduced, and the cost for inspection and cleaning can be reduced.

(Example)
Next, the drainage system of this embodiment will be described using examples.

FIG. 7 is a diagram for explaining the configuration of the drainage system 1 of this embodiment. FIG. 8 is a diagram showing an example of a pipe connection structure 80 of the drainage system 1 of this embodiment. FIG. 9(a) is an exploded view of the pipe connection structure 80 of FIG. FIG. 10 is a diagram showing the configuration of a drainage system 1000 of a comparative example. The drainage system 1000 of the comparative example differs from the drainage system 1 of the embodiment in that the siphon drain member 30 is not provided and the position of the drain port is the same as the bottom surface 83a described later. is the same as that of the embodiment.

In this embodiment, the lower container 22' is used and the metal lid 10 and the upper container 21 are not arranged. Further, as shown in FIG. 7, unlike the narrowed portion 53 of the above-described embodiment, the narrowed portion 53' of the lower measure 22' does not have a bottom surface 53b and has only a cylindrical portion 53a'.

As shown in FIG. 7 , an elbow joint 91 is connected to the lower end of pipe 90 , and pipe 92 is connected to elbow joint 91 . The pipe 92 is flat and extends horizontally from the elbow joint 91 . An elbow joint 93 is connected to the other end of the pipe 92 , and a pipe 94 is connected to the elbow joint 93 . A pipe 94 extends downward from the elbow joint 93 . An elbow joint 95 is arranged at the lower end of the pipe 94 , and a pipe 96 is connected to the elbow joint 95 . The pipe 96 extends flatly and horizontally from the elbow joint 95 . An elbow joint 97 is connected to the other end of the pipe 96, and the other end of the elbow joint 97 faces downward and is connected to a drainage basin.

In addition, the length of the long side of the lower measure 22' is set to 500 mm, the length of the pipe 90 is set to 500 mm, the length of the pipe 92 is set to 5000 mm, and the length of the pipe 94 is set to 5000 mm. , the length of the pipe 96 is set to 1500 mm.

The pipe connection structure 80 of this embodiment has a socket 81, a pipe 82, a cap 83, a socket 84 and a pipe 85 as shown in FIGS. 8 and 9(a). The socket 81 is a joint for vinyl chloride pipes, into which the cylindrical portion 71 of the siphon drain member 30 is inserted from above. The pipe 82 is a vinyl chloride pipe and is inserted from below the socket 81 . By adjusting the length of this pipe 82, the height position of the siphon drain member 30 can be changed.

The cap 83 is a joint for vinyl chloride pipes. FIG. 9B is a perspective view of the cap 83 viewed from the bottom side. The cap 83 is arranged such that the lower end of the cylindrical portion 53a' of the throttle portion 53' is inserted inside the cap 83. As shown in FIG. As shown in the figure, the cap 83 has a hole 83b formed in the center of the bottom surface 83a with an outer diameter of the tube 82 plus 1 mm. The pipe 82 is inserted through the hole 83b. In this embodiment, the bottom surface 83a of the cap 83 corresponds to the bottom surface 53b of the constricted portion 53 in FIG. 2 and forms a water stop surface. A hole 83b corresponds to the through hole 53d in FIG.

The socket 84 is a joint for vinyl chloride pipes and connects the pipes 82 and 85 . Socket 84 is arranged as a locating and support for cap 83 . The pipe 85 is a vinyl chloride pipe and is inserted into the socket 84 from below. The pipe 90 described above is configured by the socket 81 , the pipe 82 , the socket 84 and the pipe 85 . Also, the cap 83 is included in the drain basin together with the lower basin 22'.

The tube 85 is fixed by a U-band 87 and an angle 86 so as not to come off, as shown in FIG. A silicon sealant (manufactured by Sekisui Chemical Co., Ltd.) 88 is applied over the entire periphery to seal the space between the upper end of the cap 83 and the narrowed portion 53'. Furthermore, a silicon sealant (manufactured by Sekisui Chemical Co., Ltd.) 89 is applied over the entire circumference between the socket 84 and the cap 83 for sealing.

Also, as shown in FIG. 8, the height from the bottom surface 83a of the cap 83 to the drain port 34a of the siphon drain member 30 is H2. The height of H2 can be varied by changing the length of tube 82 described above.

In Examples 1 and 2 and Comparative Examples 1 to 3, the sizes of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96, the presence or absence of the siphon drain member 30, and the position of the drain port 34a from the throttle upper portion 53c were determined. In each configuration, the presence or absence of the siphon phenomenon, the amount discharged when 50 g of earth and sand were thrown into the lower trough 22', and the drainage flow rate were measured.

In Example 1, the size of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 is set to 75A, the height H1 from the drain port 34a of the siphon drain member 30 to the lid member 31 is set to 50 mm, and the height H2 is set to 50 mm. was set to 145 mm. At this time, a siphon phenomenon occurred, the drainage flow rate was 20 L/s, and no foreign matter was discharged from the elbow joint 97 .

In Example 2, the size of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 was set to 100A, the height H1 was set to 50 mm, and the height H2 was set to 155 mm. At this time, a siphon phenomenon occurred, the drainage flow rate was 30 L/s, and no foreign matter was discharged from the elbow joint 97 .

In Comparative Example 1, the size of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 is 75A, and the position of the drain port (the position of the upper end 81a of the socket 81) is aligned with the bottom surface 83a of the throttle portion 53'. rice field. At this time, no vortex was generated and no siphon phenomenon occurred, the discharge flow rate was 13 L/s, and foreign matter was discharged from the elbow joint 97, and the amount of foreign matter was 30 g.

In Comparative Example 2, the size of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 was set to 100A, and the position of the drain port (upper end position of the socket 81) was aligned with the bottom surface 83a of the throttle portion 53'. At this time, a vortex flow was generated, no siphon phenomenon occurred, the discharge flow rate was 18 L/s, and foreign matter was discharged from the elbow joint 97, and the amount of foreign matter was 35 g.

In Comparative Example 3, the size of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 was set to 200A, and the position of the drain port (upper end position of the socket 81) was aligned with the bottom surface 83a of the throttle portion 53'. At this time, no vortex was generated, no siphon phenomenon occurred, the flow rate of the discharged water was 30 L/s, and the discharge of foreign matter from the elbow joint 97 was observed, and the amount of foreign matter was 28 g.

As described above, the siphon phenomenon can be generated by arranging the siphon drain member 30 . In addition, by providing a space S between the bottom surface 83a and the drain port 34a, it is possible to suppress the inflow of foreign matter into the piping 90 of foreign matter.

Moreover, by generating a siphon phenomenon, a high drainage flow rate can be achieved even when the pipe diameter is small.

(Characteristics, etc.)
(1)
The drainage system 1 of the present embodiment includes a metal lid 10, a drainage basin 20, and a siphon drain member 30 (an example of a drainage member). The drainage basin 20 has an opening 20a and a bottom surface 53b (an example of a water stop surface). The metal lid 10 is arranged in the opening 20a. The bottom surface 53b is arranged below the opening 20a and stops the water flowing from the opening 20a. The siphon drain member 30 (an example of a drainage member) has a lid member 31 and a drainage port 34a, is arranged inside the drainage basin 20, and is used to drain water through a pipe 90 connected to the drainage port 34a. Induces the occurrence of siphoning. The drain port 34 a is formed facing the lid member 31 . The drain port 34a is arranged above the bottom surface 53b.

As a result, foreign substances can be accumulated in the space S between the drain port 34a and the bottom surface 53b, so that the inflow of foreign substances into the drain port 34a can be reduced.

In addition, a siphon phenomenon can be generated, and high flow rate drainage can be realized with a small diameter. For this reason, it is possible to use piping with a smaller diameter than before, so that the weight can be reduced and the working efficiency can be improved.

(2)
In the drainage system 1 of the present embodiment, the drainage basin 20 further has narrowed portions 53, 53' arranged below the opening 20a and having a smaller area than the opening 20a. The drain port 34a is arranged between the throttle portion 53 and the opening portion 20a.

As a result, foreign matter that has flowed into the throttle portion 53 from the opening 20a together with rainwater accumulates in the space S including the throttle portion 53, so that the inflow of foreign matter into the drain port 34a can be reduced.

(3)
In the drainage system 1 of this embodiment, the drainage basin 20 has a lower basin 22 and an upper basin 21 . The lower measure 22 has a narrowed portion 53 . The upper measure 21 has an opening 20 a and is arranged above the lower measure 22 .

As a result, the drainage basin 20 can be formed by at least two members, the upper basin 21 and the lower basin 22 . Also, the materials of the upper and lower baskets 21 and 22 can be changed. For example, the upper and lower baskets 21 and 22 can be made of metal and FRP (Fiber Reinforced Plastics), respectively.

(4)
In the drainage system 1 of the present embodiment, the drainage basin 20 has a bottom surface 53b that forms a water stop surface.
As a result, rainwater can be stopped at the bottom surface 53b of the drainage basin 20. As shown in FIG.

(5)
In the drainage system 1 of the present embodiment, the drainage basin 20 has a cap 83 (an example of a water stop member). The narrowed portion 53' has a tubular shape extending toward the water stop surface. The cap 83 covers the tip of the throttle portion 53'. A cap 83 forms a water stop surface.
Such a cap 83 forms a water cutoff surface and can stop rainwater.

(6)
In the drainage system 1 of the present embodiment, the drainage basin 20 is formed so that the area perpendicular to the opening 20a gradually decreases from the opening 20a toward the narrowed portions 53 and 53'. there is

As a result, the rainwater that has flowed into the opening 20a can be vigorously flowed into the throttle section 53. - 特許庁

(7)
In the drainage system 1 of the present embodiment, a pipe 90 connected to the drain port 34a of the siphon drain member 30 passes through the bottom surface 53b or the bottom surface 83a (an example of a water stop surface).
As a result, the periphery of the pipe 90 is used as a space S in which foreign substances are stored.

(8)
In the drainage system 1 of the present embodiment, the siphon drain member 30 has the opening 34b to the pipe 90, and the opening 34b is connected to the drainage port 34a. The lid member 31 is arranged to close the opening 34b when viewed from above in the vertical direction, and the projected area of the lid member 31 with respect to a plane perpendicular to the vertical direction is set larger than the projected area of the opening 34b.

Thereby, even when the siphon drain member 30 is obliquely arranged, a siphon phenomenon can be generated.

(9)
In the drainage system 1 of this embodiment, it is provided in the side ditch of the bridge 200 .

As a result, the rainwater falling on the bridge 200 can be drained efficiently. Moreover, since the bridge 200 is high, it is likely to cause a siphon phenomenon, and is suitable for using the siphon drain member 30 .

[Other embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the invention.

(A)
In the above embodiment, the drainage basin 20 is divided into the upper basin 21 and the lower basin 22, but the upper basin 21 and the lower basin 22 may be constructed integrally. In this case, the height adjuster 23 may not be provided. For example, the structure may be such that the metal lid 10 is placed directly on the lower chamber 22 of FIG.

(B)
In the above embodiment, the lower measure 22 is provided with the narrowed portion 53, but the narrowed portion 53 may not be provided. FIG. 12 is a diagram showing a drainage system 101 using a drainage basin 120 having a lower basin 122 in which the constricted portion 53 is not formed. The bottom surface 122a of the lower measure 122 is formed to have a smaller area than the opening 20a. The drain port 34a is located above the bottom surface 122a, and the space S' in the lower basin 122 between the bottom surface 122a and the drain port 34a serves as a garbage collecting portion.

Although the siphon drain member 30 is arranged inside the drainage basins 20 and 120 , a part of the siphon drain member 30 may protrude from the drainage basins 20 and 120 . 12, the cylindrical portion 71 of the siphon drain member 30 substantially coincides with the outer surface of the bottom surface 122a of the drainage basin 120 in FIG. may protrude from the outer surface of the

(C)
In the above-described embodiment, the upper container 21 is made of metal and the lower container 22 is made of FRP, but the present invention is not limited to this. The upper container 21 may be made of FRP, and the lower container 22 may be made of metal.

(D)
In the above-described embodiment, it is described that the tubular portion 71 is inserted into the pipe 90, and the siphon drain member 30 is inserted into the socket 81 in the embodiment, but the present invention is not limited to this. For example, a male screw is formed on the outer circumference of the tubular portion 71, a female screw is formed inside a member (for example, a socket 81) at the upper end of the pipe 90, and the tubular portion 71 and the pipe 90 are screwed together by screwing the male screw and the female screw. may be connected. Alternatively, the tubular portion 71 and the pipe 90 may be connected with an adhesive or the like.

(E)
In the above-described embodiment, as shown in FIG. 2, the diaphragm portion 53 is arranged on one side of the left and right sides of the opening 20a relative to the center of the opening portion 20a in the left-right direction, but the arrangement is not limited to this. For example, the opening 20a may be centrally located.

INDUSTRIAL APPLICABILITY The drainage system of the present invention has the effect of reducing the inflow of foreign matter into the drainage port, and is useful as a rainwater drainage system installed on a bridge or the like.

Reference Signs List 1: drainage system 10: metal lid 20: drainage basin 20a: opening 30: siphon drain member
34a: drain port 53b: bottom

Claims (9)

a metal lid;
a drainage basin having an opening in which the metal lid is arranged, and a water stopping surface arranged below the opening for stopping water flowing from the opening;
A siphon phenomenon occurs in water discharged through a pipe connected to the drainage basin, which has a lid member and a drainage port formed opposite to the lid member, and is disposed inside the drainage basin. a drainage member that induces
The drain port is arranged above the water stop surface,
drainage system. The drainage basin further has a narrowed portion having an area smaller than that of the opening,
The drain port is arranged between the constricted portion and the opening,
The drainage system according to claim 1. The drainage basin is
a lower cup having the narrowed portion;
an upper container having the opening and arranged above the lower container;
A drainage system according to claim 2. The drainage basin has a bottom surface forming the water stop surface,
3. A drainage system according to claim 1 or 2. It has a cylindrical shape extending from the narrowed portion toward the water stop surface,
The drainage basin has a water stop member that covers the tip of the narrowed portion,
wherein the water stop member forms the water stop surface;
A drainage system according to claim 2. The drainage basin is formed so that the area thereof gradually decreases from the opening perpendicular to the opening toward the throttle,
A drainage system according to claim 2. A pipe connected to the drain port of the drain member passes through the water stop surface,
The drainage system according to any one of claims 1-6. The drainage member has an opening to the pipe, and the opening is connected to the drainage port,
The lid member is arranged to close the opening when viewed from above in the vertical direction, and the projected area of the lid member with respect to a plane orthogonal to the vertical direction is set larger than the projected area of the opening.
The drainage system according to any one of claims 1-7. The drainage system is provided in the gutter of the bridge,
The drainage system according to any one of claims 1-8.

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