Drainage Systems and Drains

Abstract

To provide a drainage system capable of realizing high flow rate drainage with a small diameter.SOLUTION: A drainage system 1 has a metal lid 10, a drainage basin 20, and a siphon drain member 30. The drainage basin 20 has an opening 20a where the metal lid 10 is placed and a bottom surface 83a that is smaller in area than the opening 20a. The siphon drain member 30 that is provided inside the drainage basin 20 has a drain port 34a, a plurality of vertical ribs 33 formed upward from the periphery of the drain port 34a, and a mounting tube 32 connected to the drain port 34a. A siphon drain member 30 is provided on the bottom surface 83a.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a drainage system. [Background technology]

[0002] Conventionally, storm water cisterns are arranged in the gutters of bridges to drain rainwater (see, for example, Patent Document 1).

[0003] The rainwater manhole shown in Patent Document 1 includes a main body, an upper frame disposed on the top of the main body, and a metal lid disposed on the upper frame, and a drainage pipe is connected to the bottom end of the main body. Rainwater flowing in from the metal lid flows into the drainage pipe via the rainwater manhole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-156243 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, with conventional storm water drainage systems, even if high flow rates were attempted, air would flow in due to vortexes, limiting the flow rate. Therefore, the only way to increase the drainage flow rate was to increase the diameter of the pipes or the number of manholes.

[0006] An object of the present invention is to provide a drainage system capable of achieving high flow rate drainage with a small diameter. [Means for solving the problem]

[0007] In order to achieve the above object, a drainage system according to a first aspect of the present invention includes a metal cover, a drain basin, and a drain member. The drain basin has an opening in which the metal cover is placed. The drain member includes a cover member and a drain outlet, and is placed inside the drain basin to induce a siphon effect in water drained through a pipe connected to the drain outlet. The drain outlet is formed opposite the cover member.

[0008] By providing the drainage member in this manner, a high flow rate of water can be discharged from the piping connected to the drainage member.

[0009] In addition, the siphon effect can be generated, allowing high flow rate drainage with a small diameter, which means that smaller diameter piping can be used than before, making it lighter in weight and improving work efficiency, while also reducing costs as less material is required.

[0010] The drainage system according to the second aspect of the present invention is the drainage system according to the first aspect of the present invention, wherein the drainage basin further includes a throttle portion. The throttle portion is disposed below the opening and has a smaller area than the opening. The drain outlet is disposed at the same level as the upper end or below the upper end of the throttle portion.

[0011] In this way, by positioning the drain outlet at the same level as the upper end of the throttle portion or lower than the upper end of the throttle portion, foreign matter can be discharged through the drain member along with the water flowing from the opening toward the throttle portion.

[0012] In addition, because the drainage member drains the water at a high flow rate, the foreign matter can be forced through the pipe with force, and as much of the foreign matter as possible can be expelled from the pipe. This reduces the amount of foreign matter remaining in the pipe, and reduces the occurrence of clogging.

[0013] The drainage system according to the third invention is the drainage system according to the second invention, wherein the drainage member has an opening to the pipe, and the opening is connected to the drain outlet. Let the diameter of the throttle portion be r, the diameter of the drainage member be R2, the diameter of the opening be R1, the height from the drain outlet to the lid member be H1, and the height from the drain outlet to the upper end portion of the throttle portion be H2. Then, 0 ≦ H2 ≦ H1, and R1 ≦ r and r - R2 ≦ 100 mm are satisfied.

[0014] Thereby, foreign matters are drained by the drainage member within the range of 0 ≦ H2 ≦ H1. By setting R1 ≦ r, it is possible to flow in without drainage resistance. When r - R2 is larger than 100 mm, that is, when r is too large with respect to R2, foreign matters will accumulate in the throttle portion without being sucked into the drainage member. However, by setting r - R2 ≦ 100 mm, foreign matters can be discharged without being stored in the throttle portion.

[0015] The drainage system according to the fourth invention is the drainage system according to the second invention. Let the diameter of the throttle portion be r, the diameter of the drainage member be R2, the height from the drain outlet to the lid member be H1, and the height from the drain outlet to the upper end portion of the throttle portion be H2. Then, In the range of H1 < H2, 20 mm ≦ r - R2 ≦ 100 mm is satisfied.

[0016] Thereby, foreign matters together with the water flowing from the opening portion toward the throttle portion can be efficiently discharged through the siphon drain member.

[0017] When r - R2 is smaller than 20 mm, it becomes a resistance to the drainage inflow and a high drainage volume cannot be obtained, and the effect of the present invention is greatly reduced. Also, when it is larger than 100 mm, that is, when r is too large with respect to R2, foreign matters will accumulate in the throttle portion without being sucked into the drainage member. However, by setting r - R2 ≦ 100 mm, foreign matters can be discharged without being stored in the throttle portion.

[0018] A drainage system according to a fifth aspect of the present invention is the drainage system according to the second aspect of the present invention, wherein the drainage manhole has a lower manhole and an upper manhole. The lower manhole has a constricted portion. The upper manhole has an opening and is disposed above the lower manhole.

[0019] This allows the catchment area to be formed by at least two components, an upper and lower sump. The materials of the upper and lower sump can also be different; for example, the upper sump can be made of metal and the lower sump can be made of FRP (Fiber Reinforced Plastics).

[0020] A drainage system according to a sixth aspect of the present invention is the drainage system according to the second aspect of the present invention, wherein the throttle portion has a bottom surface that forms a water-stopping surface. This allows rainwater to be stopped by the bottom surface of the narrowed portion of the catch basin.

[0021] A drainage system according to a seventh aspect of the present invention is the drainage system according to the second aspect of the present invention, in which the throttle portion is tubular and extends downward. The drainage basin portion has a water-stopping member that covers the tip of the throttle portion. The water-stopping member forms a water-stopping surface. Such a water-stopping member forms a water-stopping surface, which can stop rainwater from entering.

[0022] The drainage system according to an eighth aspect of the present invention is the drainage system according to the second aspect of the present invention, wherein the drainage basin is formed so that the area perpendicular to the opening gradually decreases from the opening toward the constriction portion. This allows rainwater flowing into the opening to flow forcefully into the throttle section.

[0023] A drainage system according to a ninth aspect of the present invention is the drainage system according to the first aspect of the present invention, wherein the catch basin has a bottom surface with an area smaller than that of the opening. The drain outlet is disposed at approximately the same position as the bottom surface. The bottom surface forms a water stopping surface that stops water.

[0024] In this way, by arranging the drain outlet at approximately the same position as the bottom surface, foreign matter can be discharged via the drain member together with the water flowing from the opening toward the bottom surface.

[0025] In addition, if a siphon phenomenon occurs due to the drainage member, foreign objects can be forcefully flushed through the pipe, allowing as much of the foreign objects as possible to be expelled from the pipe. This reduces the amount of foreign objects remaining in the pipe and reduces the occurrence of clogging.

[0026] A drainage system according to a tenth aspect of the present invention is the drainage system according to the ninth aspect of the present invention, wherein the drainage basin is formed so that the area perpendicular to the opening gradually decreases from the opening toward the bottom surface.

[0027] This allows rainwater flowing into the opening to flow forcefully toward the bottom.

[0028] A drainage system according to an eleventh aspect of the present invention is the drainage system according to the sixth, seventh or ninth aspect of the present invention, wherein a pipe connected to a drain outlet of the drainage member penetrates the water-stopping surface. This allows the water to be stopped by the water-stopping surface around the piping.

[0029] A drainage system according to a twelfth aspect of the present invention is the drainage system according to any one of the first to eleventh aspects of the present invention, in which the cover member has an opening to a pipe, and the opening is connected to the drain outlet. The cover member is disposed so as to cover the opening when viewed from above in the vertical direction, and the projected area of ​​the cover member on a plane perpendicular to the vertical direction is set to be larger than the projected area of ​​the opening.

[0030] This allows the siphon effect to occur even if the drainage member is disposed at an angle.

[0031] A drainage system according to a thirteenth aspect of the present invention is the drainage system according to any one of the first to twelfth aspects of the present invention, and is provided in a side gutter of a bridge.

[0032] This allows rainwater that falls on the bridge to be drained efficiently. Effect of the Invention

[0033] According to the present invention, it is possible to provide a drainage system capable of achieving high flow rate drainage with a small diameter. [Brief description of the drawings]

[0034] [Figure 1] FIG. 1 is a diagram showing a state in which a drainage system according to an embodiment of the present invention is installed on a bridge. [Diagram 2] 1 is a schematic cross-sectional view showing a configuration of a drainage system according to an embodiment of the present invention. [Diagram 3] 3 is an exploded perspective view showing the metal cover and the catch basin portion 20 of FIG. 2. [Figure 4] FIG. 3 is a perspective view showing the siphon drain member of FIG. 2. [Diagram 5] FIG. 3 is a perspective cross-sectional view showing the siphon drain member of FIG. 2. [Figure 6] Front view of Figure 5. [Figure 7] FIG. 1 is a diagram showing the configuration of a drainage system according to an embodiment of the present invention. [Figure 8] FIG. 2 is a diagram showing an example of a piping connection structure of the drainage system of the present embodiment. [Figure 9] 9(a) is an exploded view of the pipe connection structure of FIG. 8, and FIG. 9(b) is a perspective view of the cap of FIG. 9(a) as viewed from the bottom side. [Figure 10] FIG. 1 is a diagram showing a configuration of a drainage system of a comparative example. [Figure 11] FIG. 2 is a table showing the results of Examples 1 and 2 and Comparative Examples 1 to 3. [Figure 12] FIG. 11 is a schematic cross-sectional view showing the configuration of a drainage system in a modified example of an embodiment of the present invention. [Figure 13] FIG. 11 is a schematic cross-sectional view showing the configuration of a drainage system in a modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drainage system according to an embodiment of the present invention will be described below with reference to the drawings. <Configuration> (Overview of Drainage System 1) 1 is a diagram showing a state in which a drainage system 1 according to an embodiment of the present invention is installed on a bridge. As shown in the figure, a plurality of drainage systems 1 according to the present embodiment are arranged along the side gutters of a bridge 200. Rainwater that falls on the bridge 200 flows into the drainage system 1 and is drained outside the bridge 200.

[0036] FIG. 2 is a schematic cross-sectional view showing the configuration of the drainage system 1 of the present embodiment. As shown in FIG. 2, the drainage system 1 of the present embodiment includes a metal cover 10, a drain basin portion 20, and a siphon drain member 30.

[0037] (metal lid) FIG. 3 is an exploded perspective view of the metal cover 10 and the catch basin portion 20. As shown in FIG.

[0038] The metal cover 10 is a metal cover having a plurality of holes. The plurality of holes may be of any shape as long as they do not prevent the inflow of rainwater. For example, the plurality of holes may be formed in a mesh shape like a grating, or may have a plurality of rectangular holes. The metal cover 10 is supported by a catchment 20, and rainwater flows from the metal cover 10 into the catchment 20. In the present embodiment, the metal cover 10 is rectangular in shape as an example, but is not limited thereto and may be a polygon other than a rectangle, a circle, or an ellipse.

[0039] (Drainage basin) The catch basin portion 20 has an upper basin 21, a lower basin 22, and a height adjustment portion 23. The upper basin 21 is made of metal and is a frame disposed around the metal lid 10. The inside of the upper basin 21 corresponds to the opening 20a of the catch basin portion 20, and the metal lid 10 is disposed thereon.

[0040] The upper chamber 21 has a side wall 41 and a lid mounting portion 42. The side wall 41 is formed so as to surround the periphery of the metal lid 10. The lid mounting portion 42 is formed from the lower end of the side wall 41 toward the inside, generally perpendicular to the side wall 41. The metal lid 10 is placed on the lid mounting portion 42.

[0041] The lower box 22 is made of, for example, FRP, and has a side wall 51, an upper box support portion 52, a narrowed portion 53, a connection portion 54, and a formwork pipe 55.

[0042] The side wall 51 is formed to surround the upper measure 21. The upper measure support part 52 is formed from the lower end of the side wall 51 toward the inside, generally perpendicular to the side wall 51. The upper measure 21 is supported by the upper measure support part 52. The upper measure support part 52 and the lid placement part 42 are provided with a height adjustment part 23 that adjusts the height position of the upper measure 21 relative to the lower measure 22.

[0043] The throttle section 53 has a cylindrical appearance and is provided below the upper box support section 52. The throttle section 53 has a cylindrical section 53a and a bottom surface 53b. A throttle upper section 53c, which is the upper end of the cylindrical section 53a, is connected to the upper box support section 52 by a connection section 54 described below. The bottom surface 53b is disposed so as to close the lower end, which is the tip of the cylindrical section 53a.

[0044] 2, the throttle portion 53 is disposed to the left or right of the center of the opening 20a in the left-right direction. A through hole 53d is formed in the bottom surface 53b, and a pipe 90 is inserted through the through hole 53d.

[0045] The piping (including the piping 90) used in the drainage system 1 of this embodiment may have a diameter of, for example, 75A to 125A. The piping 90 is disposed substantially perpendicular to the bottom surface 53b, and its upper end is located inside the drainage basin 20. The bottom surface 53b functions as a water-stopping surface that stops the leakage of rainwater downward from the drainage basin 20. The bottom surface 53b corresponds to a lower part of the constriction, which is the lower end of the constriction section 53. The space between the bottom surface 53b and the piping 90 may be filled with a water-stopping agent or the like, or a cap-shaped member may be used as in the embodiment described later.

[0046] The connection part 54 connects the upper measure support part 52 and the narrowed part 53. The connection part 54 connects from the inner end of the upper measure support part 52 to the upper end of the cylindrical part 53a of the narrowed part 53. The connection part 54 is formed so that the cross-sectional area in the direction perpendicular to the opening 20a gradually decreases from the upper measure support part 52 toward the narrowed part 53.

[0047] The formwork pipe 55 is cylindrical, and is disposed around the cylindrical portion 53a of the drawn portion 53. The formwork pipe 55 protects the drawn portion 53 and the like from the concrete 201.

[0048] The height adjustment unit 23 adjusts the height position of the upper measure 21 relative to the lower measure 22. The height adjustment unit 23 has a bolt 61 and a nut 62. The bolt 61 is inserted into a through hole formed in the upper measure support part 52. The bolt 61 is disposed substantially perpendicular to the upper measure support part 52. The head 61a of the bolt 61 abuts against the lid placement part 42 of the upper measure 21 from below. The nut 62 is fixed to the upper measure support part 52 so as to be coaxial with the through hole. The bolt 61 is inserted into the nut 62. The height of the upper measure 21 relative to the lower measure 22 can be changed by changing the amount of screwing of the bolt 61 into the nut 62. The height adjustment unit 23 may be provided on all of the opposing long sides and the opposing short sides of the upper measure support part 52, or may be provided on only one of them.

[0049] 2, concrete 201 is laid up to the top end of the lower box 22, and pavement 202 is laid on top of the concrete 201. The top end of the pavement 202 and the top end of the upper box 21 are roughly aligned. The position of the upper box 21 relative to the lower box 22 can be adjusted by the height adjustment unit 23 to match the thickness of the pavement 202.

[0050] (Siphon drain component) The siphon drain member 30 (an example of a drainage member) induces the occurrence of a siphon phenomenon in the water drained into the connected piping 90. The siphon drain member 30 is a drainage member having a high drainage function for improving the drainage capacity of the rainwater that has flowed into the drainage basin 20.

[0051] Fig. 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.

[0052] The siphon drain member 30 can be made by injection molding using synthetic resin such as hard polyvinyl chloride resin, polycarbonate, ABS, AES, etc. Note that the material is not limited to synthetic resin, and it may be made of cast iron using a mold.

[0053] The siphon drain member 30 has a cover member 31, an attachment tube 32, and a plurality of vertical ribs 33.

[0054] The cover member 31 is plate-like and formed into a disk shape. The mounting tube 32 is formed into a cylindrical shape. The central axes of the cover member 31 and the mounting tube 32 are arranged on a common axis and coincide with the vertical direction. This common axis is defined as the drain axis O, and the mounting tube 32 of the siphon drain member 30 along the drain axis O direction is defined as the lower side, and the cover member 31 side is defined as the upper side. In addition, in a plan view of the siphon drain member 30 seen from the drain axis O direction, the direction perpendicular to the drain axis O is defined as the radial direction, and the direction going around the drain axis O is defined as the circumferential direction.

[0055] The mounting tube 32 has a tube portion 71 that forms the drop opening 34, and a plate-like flange portion 72 that extends radially outward from the upper end of the tube portion 71. A connection portion 32a on the inner side where the tube portion 71 and the flange portion 72 are connected is formed into a bell-mouth shape formed into a tapered surface or a curved surface. If the connection portion 32a is a curved surface, the radius of curvature of the cross section in the direction parallel to the drain axis O is preferably 5 mm to 20 mm.

[0056] The drop opening 34 is a portion for draining rainwater, and the opening at the upper end of the drop opening 34 (which can also be said to be the inside of the upper end of the tube portion 71) is the drain outlet 34a. The drain outlet 34a can also be said to be the inside of the flange portion 72. The distance from the drain outlet 34a to the cover member 31 is approximately the same as the distance from the flange portion 72 to the cover member 31. In the direction along the drain axis O, the positions of the drain outlet 34a and the flange portion 72 are approximately aligned.

[0057] Opening 34b of drop opening portion 34 is located below drain outlet 34a and has a constant diameter, and the opening diameter of opening 34b is indicated as R1 (see FIG. 6). The area of ​​opening 34b with opening diameter R1 is defined as the opening area of ​​drop opening portion 34. Opening diameter R1 corresponds to the inner diameter of tubular portion 71, and the opening area of ​​drop opening portion 34 corresponds to an area having the inner diameter of tubular portion 71 as its diameter. The diameter gradually increases from opening 34b toward drain outlet 34a due to connection portion 32a.

[0058] In this embodiment, since drain axis O, which is the central axis of siphon drain member 30, coincides with the vertical direction, the area of ​​cover member 31 and the opening area of ​​drop port portion 34 correspond to the projected area of ​​cover member 31 and the projected area of ​​the opening of drop port portion 34, respectively, on a plane perpendicular to the vertical direction. In this embodiment, the outer diameter of cover member 31 and the outer diameter of flange portion 72 are formed to be approximately the same.

[0059] The siphon drain member 30 is disposed, for example, by inserting the cylindrical portion 71 into the inside of the pipe 90 from above.

[0060] 4 and 5, the portion formed between the outer peripheral edge 31a of the cover member 31 and the outer peripheral edge 72a of the flange portion 72 becomes the inflow opening 30a through which rainwater flows into the drain outlet 34a of the drop-off portion 34 (see arrow B in FIG. 5). The size and height shape of the cover member 31 are adjusted so that the area of ​​the inflow opening 30a is larger than the opening area of ​​the opening 34b of the drop-off portion 34 (portion of diameter R1).

[0061] As shown in FIG. 5, the vertical ribs 33 connect the upper surface 72d of the flange 72 of the mounting tube 32 and the outer periphery of the lower surface 31c of the cover member 31. The cover member 31 is supported from below by the vertical ribs 33, and is supported at a position that ensures a predetermined height H1 from the mounting tube 32, as shown in FIG. 6. The vertical ribs 33 are provided on the inlet opening 30a, and are formed along the radial direction in a plan view and cross the circumferential direction. The vertical ribs 33 have a function of rectifying rainwater flowing from the inlet opening 30a to the drop opening 34. 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, but this is not limited to this.

[0062] The lid member 31 is disposed so as to close the opening 34b of the drop opening portion 34 when viewed from above in the vertical direction. The area of ​​the lid member 31 is set to be larger than the opening area (the portion of diameter R1) of the opening 34b of the drop opening portion 34. In this embodiment, the center of the lid member 31 and the center of the opening of the drop opening portion 34 coincide in the vertical direction. However, if the lid member 31 and the drop opening portion 34 are both disposed at an angle, if the lid area of ​​the lid member 31 is set to be the same as the opening area of ​​the drop opening portion 34, the opening 34b of the drop opening portion 34 cannot be closed when viewed from the vertical direction, and a gap through which air enters (an air core due to a vortex) is generated between the lid member 31 and the drop opening portion 34.

[0063] Therefore, it is preferable that the projected area of ​​the cover member 31 on a plane perpendicular to the vertical direction is set to be larger than the projected area of ​​the opening 34b of the drop opening portion 34.

[0064] The lid diameter R2 or minimum width dimension of the lid member 31 is larger than the opening diameter R1 (diameter R1 of the opening 34b) of the drop opening portion 34, and is 245% or less of the opening diameter R1. Furthermore, when the height from the outer peripheral edge 72a of the flange portion 72 of the lid member 31 is H1 and the opening diameter is R1, it is preferable that the value of R1 / H1 is in the range of 1.3 to 8.0, H1 is in the range of 10 to 60 mm, and the opening area is 30 cm2 or more and 190 cm2 or less.

[0065] The upper surface 31b of the cover member 31 is provided with gripping ribs 35 that protrude upward and are spaced apart in the circumferential direction. The gripping ribs 35 are gripped by an operator when connecting the siphon drain member 30 to the piping 90.

[0066] (Position of siphon drain member in drain basin) Next, the position of the siphon drain member 30 inside the catch basin portion 20 will be described.

[0067] The siphon drain member 30 is disposed inside the catch basin portion 20 such that its drain axis O coincides with the central axis of the cylindrical portion 53a of the throttle portion 53.

[0068] In this embodiment, as shown in Fig. 2, drain outlet 34a of siphon drain member 30 is disposed below constricted upper portion 53c (indicated by position P1) of constricted portion 53. The height from drain outlet 34a to siphon drain member 30 is indicated by H1 in Fig. 2, and the height from drain outlet 34a to constricted upper portion 53c is indicated by H2 in Fig. 2. Here, 0≦H2≦H1, R1≦r and r-R2≦100 mm are satisfied.

[0069] When rainwater is drained by the drainage system 1, the rainwater flowing from the metal cover 10 along the connection portion 54 flows into the drain outlet 34a through the inlet opening 30a of the siphon drain member 30. At this time, because the drain outlet 34a is positioned below the constricted upper portion 53c (indicated by position P1) of the constriction portion 53, foreign matter (such as garbage) also flows into the drain outlet 34a through the inlet opening 30a of the siphon drain member 30 together with the rainwater.

[0070] Furthermore, because the siphon drain member 30 allows the rainwater to be forcefully discharged, foreign matter is discharged without remaining in the piping 90, and clogging of the piping 90 can be suppressed.

[0071] In addition, since the siphon drain member 30 induces a siphon phenomenon, a high discharge flow rate is achieved, so that rainwater can be efficiently drained even through thin piping.

[0072] Moreover, in this embodiment, the siphon drain member 30 is disposed so that the gripping rib 35 is located above the constricted upper portion 53c (indicated by position P1), which is the upper end of the constricted portion 53. This makes it possible to easily connect the siphon drain member 30 and the piping 90 without having to insert a hand into a narrow place such as the constricted portion 53 to grip the gripping rib 35.

[0073] (Example) Next, the drainage system of this embodiment will be described using an example.

[0074] 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. 8. 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 a siphon drain member 30 is not provided and that the position of the drain outlet is the same position as a bottom surface 83a described later.

[0075] In this embodiment, a lower chamber 22' is used, and a metal cover 10 and an upper chamber 21 are not provided. Also, as shown in Fig. 7, unlike the drawn portion 53 of the above embodiment, a drawn portion 53' of the lower chamber 22' does not have a bottom surface 53b, and only has a cylindrical portion 53a'.

[0076] As shown in FIG. 7, an elbow joint 91 is connected to the lower end of a pipe 90, and a pipe 92 is connected to the elbow joint 91. The pipe 92 extends horizontally from the elbow joint 91 without any slope. 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. The pipe 94 extends downward from the elbow joint 93. An elbow joint 95 is disposed at the lower end of the pipe 94, and a pipe 96 is connected to the elbow joint 95. The pipe 96 extends horizontally from the elbow joint 95 without any slope. 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 catch basin.

[0077] In addition, the length of the long side of the lower manhole 22' is set to 500 mm, the length of pipe 90 is set to 500 mm, the length of pipe 92 is set to 5000 mm, the length of pipe 94 is set to 5000 mm, and the length of pipe 96 is set to 1500 mm.

[0078] The diameter r of the throttle portion 53 is set to 190 mm, and the diameter R2 of the siphon drain member 30 is set to 130 mm.

[0079] 8 and 9(a), the piping connection structure 80 of this embodiment has a cap 83, a socket 84, and a pipe 85. The socket 84 is a joint for a polyvinyl chloride pipe, and the cylindrical portion 71 of the siphon drain member 30 is inserted from above.

[0080] The cap 83 is a joint for a polyvinyl chloride pipe. FIG. 9(b) is a perspective view of the cap 83 as viewed from the bottom side. The cap 83 is arranged so that the lower end of the cylindrical portion 53a' of the narrowed portion 53' is inserted inside the cap 83. As shown in the figure, the cap 83 has a hole 83b that is the outer diameter of the cylindrical portion 71 of the siphon drain member 30 plus 1 mm in the center of the bottom surface 83a. The cylindrical portion 71 of the siphon drain member 30 is inserted into the hole 83b. In this embodiment, the bottom surface 83a of the cap 83 corresponds to the bottom surface 53b of the narrowed portion 53 in FIG. 2 and forms a water-stopping surface. The hole 83b corresponds to the through hole 53d in FIG. 2.

[0081] The socket 84 is arranged to serve both as a positioning device and to support the cap 83. The pipe 85 is a polyvinyl chloride pipe, and is inserted into the socket 84 from below. The socket 84 and the pipe 85 form the above-mentioned piping 90. The cap 83 is included in the catch basin portion together with the lower basin 22'.

[0082] 8, the tube 85 is fixed in place by a U-band 87 and an angle 86 so as not to come off. Furthermore, a silicone sealant (manufactured by Sekisui Chemical Co., Ltd.) 88 is applied around the entire periphery between the upper end of the cap 83 and the narrowed portion 53' to seal the gap. Furthermore, a silicone sealant (manufactured by Sekisui Chemical Co., Ltd.) 89 is applied around the entire periphery between the socket 84 and the cap 83 to seal the gap.

[0083] 8, the height from the drain outlet 34a of the siphon drain member 30 to the throttle upper part 53c' of the throttle portion 53' is designated as H2. The height H2 can be changed by changing the length of the throttle portion 53'.

[0084] In Examples 1 and 2 and Comparative Examples 1 to 3, the sizes of pipe 85 of pipe 90 and pipes 92, 94, and 96, the presence or absence of siphon drain member 30, and the position of drain outlet 34a from throttle upper portion 53c were changed, and the occurrence or absence of siphon phenomenon was confirmed and the maximum dischargeable flow rate was measured for each configuration. Also, in each configuration of Examples 1 and 2 and Comparative Examples 1 to 3, three stones with a diameter of about 3 cm were put in at an inflow rate of 10 L / s and whether they could be discharged was measured to evaluate transportability, and the amount of soil discharged when 50 g of soil was put in lower basin 22' was measured.

[0085] Fig. 11 is a table showing the results of Examples 1 and 2 and Comparative Examples 1 to 3. Regarding transportability, the case where three stones were able to be removed was indicated as "OK" (◯), and the case where no stones were able to be removed was indicated as "UNOK" (X).

[0086] In Example 1, the size of the pipe 85 of the piping 90 and the pipes 92, 94, and 96 was set to 75A, the height H1 from the drain outlet 34a of the siphon drain member 30 to the cover member 31 was set to 50 mm, and the height H2 from the throttle upper portion 53c' to the drain outlet 34a was set to 15 mm. At this time, the siphon phenomenon occurred, the drainage flow rate was 20 L / s, and 47 g of foreign matter was discharged from the elbow joint 97. In addition, the three stones that were inserted could be discharged.

[0087] In Example 2, the size of the pipe 85 of the pipe 90 and the pipes 92, 94, and 96 was 100A, the height H1 was set to 50 mm, and the height H2 was set to 10 mm. At this time, the siphon phenomenon occurred, the drainage flow rate was 30 L / s, and 45 g of foreign matter was discharged from the elbow joint 97. In addition, the three stones that were inserted could be discharged.

[0088] In Comparative Example 1, the size of pipe 85 of pipe 90 and pipes 92, 94, and 96 was set to 75A, and the position of the drain outlet (the position of upper end 84a of socket 84) was aligned with bottom surface 83a of cap 83 (the lower part of the constriction of constriction section 53'). At this time, a vortex was generated and no siphon phenomenon occurred, the drainage flow rate was 13 L / s, and 30 g of foreign matter was discharged from elbow joint 97. In addition, the three stones that were inserted could not be discharged.

[0089] In Comparative Example 2, the size of pipe 85 of pipe 90 and pipes 92, 94, and 96 was set to 100A, and the position of the drain outlet (the position of upper end 84a of socket 84) was aligned with bottom surface 83a of cap 83 (the lower part of the constriction of constriction section 53'). At this time, a vortex was generated and no siphon phenomenon occurred, the drainage flow rate was 18 L / s, and 35 g of foreign matter was discharged from elbow joint 97. In addition, the three stones that were inserted could not be discharged.

[0090] In Comparative Example 3, the size of pipe 85 of pipe 90 and pipes 92, 94, and 96 was set to 200A, and the position of the drain outlet (the position of upper end 84a of socket 84) was aligned with bottom surface 83a of cap 83 (the lower part of the constriction of constriction section 53'). At this time, a vortex was generated and no siphon phenomenon occurred, the drainage flow rate was 70 L / s, and 28 g of foreign matter was discharged from elbow joint 97. In addition, the three stones that were inserted could not be discharged.

[0091] As described above, the siphon effect can be generated by disposing the siphon drain member 30. Furthermore, by generating the siphon effect, a high drainage flow rate can be achieved even when the piping diameter is small.

[0092] In addition, the siphoning phenomenon allowed the three stones that were put in to be discharged, and furthermore, of the 50 g of soil and sand, 47 g was discharged in Example 1, and 45 g was discharged in Example 2. Thus, compared to the comparative example, in this example, most of the foreign matter that was put in can be discharged from the pipe, and therefore clogging in the pipe can be suppressed.

[0093] (Features, etc.) (1) The drainage system 1 of this embodiment has a metal lid 10, a drain basin 20, and a siphon drain member 30 (an example of a drainage member). The drain basin 20 has an opening 20a in which the metal lid 10 is placed. The siphon drain member 30 has a lid member 31 and a drain outlet 34a, and is placed inside the drain basin 20 to induce the siphon phenomenon in water drained by a pipe 90 connected to the drain outlet 34a. The drain outlet 34a is formed opposite the lid member 31.

[0094] By providing the siphon drain member 30 in this manner, a high flow rate of drainage from the pipe 90 connected to the siphon drain member 30 can be achieved.

[0095] In addition, the siphon effect can be generated, allowing high flow rate drainage with a small diameter, which means that smaller diameter piping can be used than before, making it lighter in weight and improving work efficiency, while also reducing costs as less material is required.

[0096] (2) In the drainage system of this embodiment, the drain basin 20 further has a throttle portion 53. The throttle portions 53, 53' are disposed below the opening 20a and have a smaller area than the opening 20a. The drain outlet 34a is disposed below the throttle upper portions 53c, 53c' (an example of the upper end portion of the throttle portion).

[0097] In this manner, by arranging the drain outlet 34a below the throttle upper portion 53c, foreign matter can be discharged via the siphon drain member 30 together with the water flowing from the opening 20a toward the throttle portion 53.

[0098] In addition, because the siphon drain member 30 drains at a high flow rate, foreign matter can be forcefully flushed through the piping, and as much of the foreign matter as possible can be expelled from the piping. This reduces the amount of foreign matter remaining in the piping, and reduces the occurrence of clogging.

[0099] (3) In the drainage system 1 of this embodiment, the siphon drain member 30 (an example of a drainage member) has an opening 34b to the piping 90, and the opening 34b is connected to the drain outlet 34a. If the diameter of the constricted portions 53, 53' is r, the diameter of the siphon drain member 30 is R2 (an example of R), the diameter of the opening 34b is R1, the height from the drain outlet 34a to the cover member 31 is H1, and the height from the drain outlet 34a to the constricted upper portion 53c (an example of an upper end portion) of the constricted portion 53 is H2, then 0≦H2≦H1, R1≦r and r-R2≦100mm are satisfied.

[0100] As a result, foreign matter is drained by the drainage member within the range of 0 ≦ H2 ≦ H1. By setting R1 ≦ r, it can flow in without drainage resistance. When r - R2 is greater than 100 mm, that is, when r is too large relative to R2, foreign matter will accumulate in the throttle portion 53 without being sucked into the siphon drain member 30. However, by setting r - R2 ≦ 100 mm, the foreign matter can be discharged without accumulating in the throttle portion 53.

[0101] (4) In the drainage system 1 of the present embodiment, the height from the drain port 34a to the lid member 31 is set as H1, the height from the drain port 34a to the upper throttle portions 53c, 53c' (an example of the upper end portion of the throttle portion) is set as H2, the diameter of the throttle portions 53, 53' is set as r, the diameter of the siphon drain member 30 is set as R2, and the height from the drain port 34a to the lid member 31 is set as H1, and the height from the drain port 34a to the upper throttle portion 53c (an example of the upper end portion) of the throttle portion 53 is set as H2. Then, Within the range of H1 < H2, 20 mm ≦ r - R2 ≦ 100 mm is satisfied.

[0102] As a result, together with the water flowing from the opening 20a toward the throttle portion 53, the foreign matter can be efficiently discharged through the siphon drain member 30. When r - R2 is less than 20 mm, it becomes a resistance to the drainage inflow and a high drainage volume cannot be obtained, and the effect of the present invention is greatly reduced. Also, when it is greater than 100 mm, that is, when r is too large relative to R2, foreign matter will accumulate in the throttle portion 53 without being sucked into the siphon drain member 30. However, by setting r - R2 ≦ 100 mm, the foreign matter can be discharged without accumulating in the throttle portion 53.

[0103] (5) In the drainage system 1 of the present embodiment, the drainage box portion 20 has a lower box 22 and an upper box 21. The lower boxes 22, 22' have throttle portions 53, 53'. The upper box 21 has an opening 20a and is disposed above the lower boxes 22, 22'.

[0104] This allows the catchment area 20 to be formed by at least two members, the upper sump 21 and the lower sump 22. In addition, the materials of the upper sump 21 and the lower sump 22 can be different; for example, the upper sump 21 can be made of metal and the lower sump 22 can be made of FRP (Fiber Reinforced Plastics).

[0105] (6) In the drainage system 1 of the present embodiment, the throttle portion 53 has a bottom surface 53b that forms a water stopping surface.

[0106] This allows the bottom surface 53b of the throttle portion 53 of the catch basin portion 20 to stop the flow of rainwater.

[0107] (7) In the drainage system 1 of this embodiment, the throttle portion 53' is tubular and extends downward. The catch basin 20 has a cap 83 (an example of a water-stopping member) that covers the tip of the throttle portion 53'. The cap 83 forms a water-stopping surface. Such a cap 83 forms a water-stopping surface, thereby preventing rainwater from entering.

[0108] (8) In the drainage system 1 of this embodiment, the drainage basin portion 20 is formed so that the area perpendicular to the opening portion 20a gradually decreases from the opening portion 20a toward the throttle portions 53, 53'.

[0109] This allows rainwater that has flowed into the opening 20a to flow into the throttle portion 53 with force.

[0110] (9) In the drainage system 1 of the present embodiment, a pipe 90 connected to the drain outlet 34a of the siphon drain member 30 penetrates through the bottom surfaces 53b, 83a (examples of water stopping surfaces). This allows the water to be stopped by the water-stopping surface around the piping 90.

[0111] (10) In the drainage system 1 of this embodiment, the siphon drain member 30 has an opening 34b to the piping 90, and the opening 34b is connected to the drain outlet 34a. The lid member 31 is disposed so as to close the opening 34b when viewed from above in the vertical direction, and the projected area of ​​the lid member 31 on a plane perpendicular to the vertical direction is set to be larger than the projected area of ​​the opening 34b.

[0112] This makes it possible to generate the siphon phenomenon even if the siphon drain member 30 is disposed at an angle.

[0113] (11) The drainage system 1 of this embodiment is provided in a side gutter of a bridge 200. This allows rainwater that falls on the bridge 200 to be drained efficiently.

[0114] [Other embodiments] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0115] (A) In the above embodiment, the lower sump 22 is provided with the throttle portion 53, but the throttle portion 53 may not be provided. Fig. 12 is a diagram showing a drainage system 101 using a catchment sump 120 equipped with a lower sump 122 without the throttle portion 53. The bottom surface 122a of the lower sump 122 is formed to have a smaller area than the opening 20a. The drain outlet 34a is disposed at approximately the same position in the height direction as the bottom surface 122a. The bottom surface 122a corresponds to the water-stopping surface of the catchment sump 120.

[0116] In this way, by positioning the drain outlet 34a at approximately the same position as the bottom surface 122a, foreign matter can be discharged through the siphon drain member 30 along with the water that flows from the opening 20a toward the bottom surface 122a and is drained by the siphon drain member 30.

[0117] In addition, if a siphon phenomenon occurs due to the siphon drain member 30, the foreign matter can be forcefully flowed through the piping 90, so that as much of the foreign matter as possible can be discharged outside the piping 90. This reduces the amount of foreign matter remaining in the piping 90, and reduces the occurrence of clogging.

[0118] Moreover, the catch basin 120 is formed so that the area perpendicular to the opening 20a gradually decreases from the opening 20a toward the bottom surface 122a.

[0119] This allows rainwater that has flowed into the opening 20a to flow vigorously toward the bottom surface 122a.

[0120] Although the siphon drain member 30 is disposed inside the catch basin 20, 120, a part of the siphon drain member 30 may protrude from the catch basin 20, 120. To explain this specifically with reference to Figure 12, in Figure 12, the tube portion 71 of the siphon drain member 30 protrudes from the outer surface of the bottom surface 122a of the catch basin 120.

[0121] (B) In the above embodiment, the drain outlet 34a is located below the constricted upper part 53c (an example of the upper end part of the constricted part), but as shown in Figure 13, it may be located at the same position in the height direction as the drain outlet 34a.

[0122] Even with this configuration, foreign matter can be discharged via siphon drain member 30 together with the water that flows from opening 20a toward throttle portion 53 and is drained by siphon drain member 30.

[0123] (C) In the above embodiment and other embodiment (B), the drain outlet 34a is disposed at the same position as the constricted upper portion 53c or below the constricted upper portion 53c, but the present invention is not limited to this and the drain outlet 34a may be disposed above the constricted upper portion 53c. In this case, foreign matter is less likely to flow into the siphon drain member 30, but a siphon effect can be induced in the drainage of the piping connected to the drain outlet 34a, so that a high flow rate of drainage can be achieved with a small diameter.

[0124] (D) In the above embodiment, the catch basin portion 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 integrally configured. In this case, the height adjustment portion 23 does not need to be provided. For example, the catch basin portion 20 may be configured so that the metal lid 10 is placed directly on the lower basin 22 in FIG. 2.

[0125] (E) In the above embodiment, it has been described that the upper chamber 21 is made of metal and the lower chamber 22 is made of FRP, but this is not limited to this. The upper chamber 21 may be made of FRP and the lower chamber 22 may be made of metal.

[0126] (F) In the above embodiment, it has been described that the tubular portion 71 is inserted into the piping 90, and in the example, the siphon drain member 30 is inserted into the socket 84, but this is not limiting. For example, a male thread may be formed on the outer periphery of the tubular portion 71, and a female thread may be formed on the inside of a member at the upper end of the piping 90 (for example, the socket 84), and the tubular portion 71 and the piping 90 may be connected by screwing the male thread and the female thread together. Also, the tubular portion 71 and the piping 90 may be connected by an adhesive or the like. [Industrial Applicability]

[0127] The drainage system of the present invention has the effect of realizing high flow rate drainage with a small diameter, and is useful as a storm water drainage system to be installed on bridges and the like. [Explanation of symbols]

[0128] 1:Drainage system 10:Metal lid 20: Drainage basin 20a: opening 30: Siphon drain component 34a: Drain port 53b: Bottom

Claims

1. Metal lid and A catchment portion having an opening in which the metal cover is placed and a bottom surface having an area smaller than that of the opening; a drainage member disposed inside the catch basin, the drainage member having a lid member, a mounting tube including a tubular portion having a drain outlet formed opposite the lid member at its upper end and a plate-shaped flange portion extending radially outward from the upper end of the tubular portion, and a plurality of vertical ribs formed from the flange portion on the periphery of the drain outlet upward to the lid member; Each of the plurality of longitudinal ribs is formed in a plate shape toward the axis of the mounting tube, The flange portion of the drainage member is disposed on the bottom surface, The plurality of longitudinal ribs and the lid member are surrounded by the catch basin in a direction perpendicular to the axis, The drainage member induces a siphon phenomenon in the water drained through a pipe connected to the mounting tube, The cylindrical portion of the mounting cylinder has an opening to the piping, The opening is disposed below the drain outlet and is connected to the drain outlet, The drainage basin portion is The nozzle further includes a cylindrical throttle portion that is disposed below the opening and has an area smaller than that of the opening, The bottom surface is disposed at a lower end of the constricted portion, If the height from the drain outlet to the cover member is H1, the height from the drain outlet to the upper end of the throttle portion is H2, the diameter of the throttle portion is r, the diameter of the opening is R1, and the diameter of the drain member is R2, then 0≦H2≦H1, R1≦r, and r-R2≦100 mm are satisfied. Drainage system.

2. Metal lid and A catchment portion having an opening in which the metal cover is placed and a bottom surface having an area smaller than that of the opening; a drainage member disposed inside the catch basin, the drainage member having a lid member, a mounting tube including a tubular portion having a drain outlet formed opposite the lid member at its upper end and a plate-shaped flange portion extending radially outward from the upper end of the tubular portion, and a plurality of vertical ribs formed from the flange portion on the periphery of the drain outlet upward to the lid member; Each of the plurality of longitudinal ribs is formed in a plate shape toward the axis of the mounting tube, The flange portion of the drainage member is disposed on the bottom surface, The plurality of longitudinal ribs and the lid member are surrounded by the catch basin in a direction perpendicular to the axis, The drainage member induces a siphon phenomenon in the water drained through a pipe connected to the mounting tube, The drainage basin portion is The nozzle further includes a cylindrical throttle portion that is disposed below the opening and has an area smaller than that of the opening, The bottom surface is disposed at a lower end of the constricted portion, If the height from the drain outlet to the cover member is H1, the height from the drain outlet to the upper end of the throttle portion is H2, the diameter of the throttle portion is r, and the diameter of the drain member is R2, H1<H2 and 20 mm≦r-R2≦100 mm are satisfied. Drainage system.

3. The catch basin has a cap forming the bottom surface, A through hole is formed in the bottom surface, The mounting tube is inserted into the through hole from above.

3. A drainage system according to claim 1 or 2.

4. a socket that supports the cap from below; and a tube inserted into the socket from below.

4. The drainage system of claim 3.

5. The cap is disposed so as to close the opening at the lower end of the throttle portion.

4. The drainage system of claim 3.

6. The drainage member includes a connection portion whose diameter increases from the mounting tube toward the drainage port, The lower end of the vertical rib is formed at the connection portion. A drainage system according to any one of claims 1 to 5.

7. The drainage basin is installed on a bridge. A drainage system according to any one of claims 1 to 6.

8. A drain used as the drainage member in the drainage system according to any one of claims 1 to 7.

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