Bypass drainage channel

Abstract

To provide a bypass drainage groove capable of suppressing overflow of water to a surrounding.SOLUTION: A bypass drainage mechanism 1 comprises a box-shaped box body 2 which is installed at an intersection of a vertical drainage groove 101 formed on a slope S and a horizontal drainage groove, and is installed overlapping above the intersection, and an upstream flow path portion 30 which is connected to one end of the box body 2 and extends linearly to guide water flowing in the vertical drainage groove 101 to the box body 2. The box body 2 comprises a bottom wall 5 and a pair of outer walls erected from the bottom wall 5 and provided on both sides of a line connecting one end of the box body 2 to the other end. The spaced dimension between the pair of outer walls is formed to be larger than the width of the upstream flow path portion 30 at any position from one end to the other end of the box body 2. The upstream flow path portion 30 comprises a guide flow path portion 31 which is provided at a gentler slope than the vertical drainage groove 101, protrudes inside the box body 2, and guides the water flowing in the upstream flow path portion 30 toward the bottom wall 5.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bypass drainage ditch installed at the intersection of a vertical drainage ditch and a horizontal drainage ditch formed on a slope surface.

Background Art

[0002] Conventionally, in an existing drainage mechanism including a vertical drainage ditch formed on a slope surface, a horizontal drainage ditch extending horizontally from a small step on the slope surface, and a water collecting tray at the confluence of the vertical drainage ditch and the horizontal drainage ditch, a bypass drainage ditch for bypassing water flowing in the vertical drainage ditch has been disclosed (see, for example, Patent Document 1).

[0003] The conventional bypass drainage ditch disclosed in Patent Document 1 includes an upper bypass drainage ditch, an intermediate bypass drainage ditch, and a lower bypass drainage ditch. The groove width of the upper bypass drainage ditch is the narrowest, the groove width of the intermediate bypass drainage ditch is slightly wider than that of the upper bypass drainage ditch, and the groove width of the lower bypass drainage ditch is slightly wider than that of the intermediate bypass drainage ditch. That is, the width of each bypass drainage ditch becomes wider as it goes down. The intermediate bypass drainage ditch is installed overlapping the upper part of the water collecting tray of the existing drainage mechanism, the upper bypass drainage ditch is installed to guide the water flowing in the vertical drainage ditch to the intermediate bypass drainage ditch, and the lower bypass drainage ditch is installed to guide the water in the intermediate bypass drainage ditch to the vertical drainage ditch.

[0004] When there is, for example, rainfall, such a conventional bypass drainage ditch allows rainwater to flow into the vertical drainage ditch of the drainage mechanism installed on the slope surface. The rainwater flowing into the vertical drainage ditch is bypassed through the upper bypass drainage ditch, the intermediate bypass drainage ditch, and the lower bypass drainage ditch and drained into the vertical drainage ditch. At the same time, rainwater flows into the horizontal drainage ditch of the existing drainage mechanism installed on the slope surface, is collected in the water collecting tray at the confluence of the vertical drainage ditch and the horizontal drainage ditch, and is drained from the water collecting tray.

Prior Art Documents

Patent Documents

[0005] Patent Document 1 Japanese Patent Application Laid-Open No. 2016-156270 Summary of the Invention Problems to be Solved by the Invention

[0006] However, in the case of heavy rain, for example, in the conventional bypass drainage ditch described above, rainwater in an amount exceeding its allowable capacity may flow in, and the rainwater may overflow from the bypass drainage ditch.

[0007] An object of the present invention is to provide a bypass drainage ditch that suppresses overflow to the surroundings. Means for Solving the Problems

[0008] The above object is solved by the following present invention. That is, the present invention is a bypass drainage ditch installed at the intersection of a vertical drainage ditch and a horizontal drainage ditch formed on a slope, comprising: a box-shaped trough body installed so as to overlap above the intersection; and an upstream flow path portion connected to one end side of the trough body and linearly extending to guide water flowing into the vertical drainage ditch to the trough body. The trough body includes a bottom wall, and a pair of outer walls that are erected from the bottom wall and provided on both sides of a line connecting one end and the other end of the trough body. The separation dimension of the pair of outer walls is formed to be larger than the width of the upstream flow path portion at any position from one end to the other end of the trough body. The upstream flow path portion is provided with a slope gentler than the slope of the vertical drainage ditch, and is provided so as to protrude into the trough body, and includes a guide flow path portion that guides water flowing into the upstream flow path portion toward the bottom wall.

[0009] According to the present invention as described above, the bucket body includes a bottom wall, and a pair of outer walls that are erected from the bottom wall and provided on both sides of a line connecting one end to the other end of the bucket body. The separation dimension of the pair of outer walls is formed to be larger than the width of the upstream channel portion at any position from one end to the other end of the bucket body. The upstream channel portion is provided with a slope gentler than the slope of the longitudinal drainage groove, and is provided to protrude into the bucket body, and includes a guiding channel portion that guides the water flowing into the upstream channel portion toward the bottom wall. According to this, the water guided by the upstream channel portion is guided by the guiding channel portion toward the bottom wall of the bucket body. Thereby, the flow path of the inflowing water is changed and the momentum of the water is weakened. That is, the inflowing water is attenuated by the guiding channel portion.

[0010] Further, it is preferable that the guiding channel portion includes a contact wall that contacts the water flowing into the upstream channel portion, an upper wall facing the bottom wall, a pair of opposing walls facing each other across a line connecting one end to the other end of the bucket body, and an opening that opens toward the bottom wall. According to this, since the guiding channel portion includes the contact wall, a configuration can be realized in which the flow path of the water guided by the upstream channel portion is changed and the momentum of the water is weakened. Further, since the guiding channel portion includes an upper wall facing the bottom wall, the water that contacts the contact wall is guided from the opening toward the bottom wall without splashing upward. Further, since the guiding channel portion includes a pair of opposing walls facing each other across a line connecting one end to the other end of the bucket body, the water that contacts the contact wall is guided from the opening toward the bottom wall without splashing laterally.

[0011] Further, it is preferable to provide a covering portion that covers the upper surface of the upstream channel portion. According to this, the water that contacts the contact wall is guided toward the bottom wall without splashing upward.

[0012] Further, it is preferable that a splash prevention lid facing the bottom wall is provided on each of one end sides of the pair of outer walls. According to this, splashing of water upward is suppressed at one end side of the bucket body.

[0013] In addition, a downstream flow path portion is connected to the other end side of the tub main body and guides the water accumulated in the tub main body to the vertical drainage groove. The downstream flow path portion is configured to have a pair of downstream side walls facing each other. The tub main body preferably includes an other end side opening for connecting the pair of downstream side walls and a notch portion formed by cutting out the bottom wall so as to be continuous with the other end side opening. According to this, the water staying inside the tub main body can be quickly discharged from the other end side opening and the notch portion.

[0014] In addition, the pair of outer walls preferably include a pair of outer wall main bodies formed such that the separation dimension between the pair of outer walls is constant, and a pair of downstream facing walls provided on the downstream side of the pair of outer wall main bodies and obliquely provided so as to approach each other as they move away from one end. According to this, the water staying inside the tub main body is rectified by the pair of downstream facing walls and guided to the other end side opening.

[0015] In addition, a downstream flow path portion is connected to the other end side of the tub main body and guides the water accumulated in the tub main body to the vertical drainage groove. The downstream flow path portion is configured to have a pair of downstream side walls facing each other and includes a pair of inner walls protruding in an arc shape inside the tub main body. One end of the inner wall is connected to the downstream facing wall, and the other end 9b of the inner wall is preferably connected to the downstream side wall. According to this, the water staying inside the tub main body is rectified by the pair of inner walls and guided to the other end side opening.

Advantages of the Invention

[0016] According to the present invention, since a guide flow path portion is provided which protrudes inside the tub main body and guides the water flowing into the upstream flow path portion toward the bottom wall, the flow path of the inflowing water is changed and the momentum of the water is weakened. That is, the inflowing water is attenuated by the guide flow path portion. As a result, rainwater can be made to stay inside the bypass drainage mechanism for a long time, and by controlling the amount of rainwater flowing into the existing drainage mechanism, it is possible to prevent overflow to the surroundings.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0018] Hereinafter, a bypass drainage mechanism 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a perspective view showing the bypass drainage mechanism 1 according to an embodiment of the present invention. FIG. 2 is a view showing a state where the bypass drainage mechanism 1 is installed in an existing drainage mechanism 100.

[0019] As shown in FIGS. 1 and 2, the bypass drainage mechanism 1 is installed in an existing drainage mechanism 100 (shown in FIG. 2) formed on the slope surface S to suppress the overflow water from the existing drainage mechanism 100. As shown in FIG. 2, the existing drainage mechanism 100 includes a vertical drainage groove 101 formed on the slope surface S, a horizontal drainage groove 102 extending horizontally on the small steps of the slope surface S, and a water collecting tray 103 at the intersection of the vertical drainage groove 101 and the horizontal drainage groove 102. The vertical drainage groove 101 is configured to have substantially the same groove width from one end to the other end, and is provided to extend linearly on the upstream side and the downstream side of the water collecting tray 103. In the present embodiment, the case where the gradient of the slope surface S is 1:1.2 and the groove width of the vertical drainage groove 101 is 250 mm will be described.

[0020] As shown in FIGS. 1 and 3, the bypass drainage mechanism 1 includes a box-shaped tray body 2 installed overlapping above the water collecting tray 103 of the existing drainage mechanism 100, an upstream flow path portion 30 connected to one end side (upstream side) of the tray body 2, a guiding flow path portion 31 continuous with the other end side (downstream side) of the upstream flow path portion 30, and a downstream flow path portion 4 connected to the other end side of the tray body 2. In the present embodiment, the upstream flow path portion 30 and the guiding flow path portion 31 are formed of a continuous single member. Hereinafter, the member including the upstream flow path portion 30, the guiding flow path portion 31, etc. may be referred to as the "upstream part 3". Further, in the present embodiment, in the state where the bypass drainage mechanism 1 is installed in the existing drainage mechanism 100, the upstream side in one direction (hereinafter may be referred to as the longitudinal direction) in the plane of the bottom wall 5 (described later) of the tray body 2 is referred to as the "one end side", and the downstream side in one direction may be referred to as the "other end side". Also, in the plane of the bottom wall 5 of the tray body 2, the direction orthogonal to the longitudinal direction may be referred to as the "width direction".

[0021] As shown in FIGS. 3 to 5, the tray body 2 includes a bottom wall 5, an upstream outer wall 6 and a downstream outer wall 7 facing each other in the longitudinal direction, a pair of outer walls 8R, 8L (shown in FIGS. 3 and 5) facing each other in the width direction, a pair of inner walls 9, 9, and a pair of splash prevention lids 10, 10.

[0022] As shown in FIG. 5, the bottom wall 5 includes a rectangular plate-shaped bottom wall main body 51, and the other end side bottom wall 52 which is continuous with the other end side of the bottom wall main body 51 and has a trapezoidal shape in plan view that becomes narrower as it advances toward the other end side. Further, the bottom wall 5 is formed in a plate shape whose longitudinal dimension is larger than the width dimension.

[0023] Also, as shown in FIG. 5, the bottom wall 5 is provided with a notch portion 53 which is formed in a semi-circular shape that protrudes toward one end by notching the edge of the other end side of the other end side bottom wall 52. Both end edges of this notch portion 53 are continuously provided with a downstream opening portion 70 (to be described later) of the downstream outer wall 7. In the present embodiment, the notch portion 53 is formed in a semi-circular shape, but the present invention is not limited to this. The notch portion 53 may be formed in a triangular shape that protrudes toward one end, or may be formed in a rectangular shape.

[0024] As shown in FIG. 3, the upstream outer wall 6 and the downstream outer wall 7 are provided so as to stand upright from the bottom wall 5. The upstream outer wall 6 is connected to an upstream flow path portion 30 and a guide flow path portion 31 (to be described later), and the downstream outer wall 7 is connected to a downstream flow path portion 4 (to be described later). The upstream outer wall 6 is provided with an upstream opening portion 60 (one end side opening portion) that communicates the inside of the upstream flow path portion 30 and the inside of the box body 2, and the downstream outer wall 7 is provided with a downstream opening portion 70 (the other end side opening portion) that communicates the inside of the downstream flow path portion 4 and the inside of the box body 2. The upstream opening portion 60 and the downstream opening portion 70 are provided to face each other in the longitudinal direction. The upstream opening portion 60 is formed in a rectangular shape by notching the upper end of the upstream outer wall 6. The downstream opening portion 70 is formed to have a predetermined width dimension (300 mm in the present embodiment) and is formed by notching from the upper end to the lower end of the downstream outer wall 7.

[0025] As shown in FIGS. 3 and 4, a pair of outer walls 8R and 8L are provided so as to stand upright from the bottom wall 5 and are provided to face each other in the width direction. Further, as shown in FIG. 5, the pair of outer walls 8R and 8L include a pair of outer wall bodies 80 and 80 having a constant width dimension and facing each other, and a pair of downstream-side facing walls 81 and 81 that are continuous with the other end sides (downstream sides) of the pair of outer wall bodies 80 and 80, respectively, and are provided obliquely so as to approach each other as they go to the other end sides. Also, as shown in FIG. 4, the pair of outer wall bodies 80 and 80 and the pair of downstream-side facing walls 81 and 81 are formed at substantially the same predetermined height.

[0026] As shown in FIG. 5, a pair of inner walls 9 and 9 are composed of curved surfaces that stand upright from the bottom wall 5 in an arc shape, and the pair of inner walls 9 and 9 are symmetrically arranged about the center line P (shown in FIG. 5). Also, as shown in FIGS. 3 and 5, one end 9a of each inner wall 9 is connected to the downstream-side facing wall 81, and the other end 9b of the inner wall 9 is connected to the edge of the downstream-side opening 70, and each inner wall 9 is provided so as to project into the inside of the box body 2. Further, as shown in FIGS. 3 and 4, each inner wall 9 is provided with a drain hole 90 formed by notching the end on the bottom wall 5 side. This drain hole 90 is provided adjacent to the notch 53 formed in the bottom wall 5.

[0027] As shown in FIGS. 3 and 5, a pair of anti-rebound lids 10 and 10 are formed in a rectangular plate shape, and the pair of anti-rebound lids 10 and 10 are symmetrically arranged about the center line P (shown in FIG. 5). Each anti-rebound lid 10 is provided at the upper end of each outer wall body 80 facing the bottom wall 5 of the box body 2 as shown in FIG. 3, and is provided at the end on one end side (upstream side) of each outer wall body 80.

[0028] As shown in FIGS. 1 and 3, the upstream part 3 includes an upstream channel part 30, a guide channel part 31 continuous with the other end side of the upstream channel part 30, and a pair of upstream fixing parts 32 provided at the boundary position between the upstream channel part 30 and the guide channel part 31 for fixing the upstream channel part 30 and the guide channel part 31 to the tub body 2. In the present embodiment, as shown in FIGS. 3 and 6, the upstream channel part 30, the guide channel part 31, and the upstream fixing parts 32 are integrally provided. Further, as shown in FIG. 1, in a state where the upstream part 3 is fixed to the tub body 2 (hereinafter sometimes referred to as a fixed state), the upstream channel part 30 is provided to protrude outside the tub body 2, and the guide channel part 31 is provided to protrude inside the tub body 2.

[0029] Also, as shown in FIG. 1, the upstream channel part 30 is connected so as to protrude from one end side of the tub body 2 and is formed to extend linearly. Further, as shown in FIG. 2, in the fixed state, the upstream channel part 30 is provided with a slope gentler than the slope of the vertical drain groove 101 so as to guide at least a part of the water flowing into the vertical drain groove 101 to the tub body 2.

[0030] As shown in FIG. 6, the upstream channel part 30 includes a rectangular first bottom wall 301, a pair of first side walls 302, 302 erected from both ends in the width direction of the bottom wall 5, and a first upper wall 303 (covering part) facing the bottom wall 5, and is formed in a cylindrical shape with a rectangular cross section. Further, as shown in FIG. 2, the width dimension of the upstream channel part 30 (the separation dimension between the pair of first side walls 302, 302) is formed to be slightly smaller than the groove width of the vertical drain groove 101. In a state where the bypass drainage mechanism 1 is installed in the existing drainage mechanism 100 (hereinafter sometimes referred to as an installation state), the end on one end side (upstream side) of the upstream channel part 30 is separated from the bottom surface (not shown) of the vertical drain groove 101 by a predetermined dimension (about 30 mm in the present embodiment).

[0031] As shown in FIG. 6, the guide flow path portion 31 includes a second upper wall 304 (upper wall) continuous with the first upper wall 303, a pair of second side walls 305, 305 (a pair of opposing walls) erected from both ends in the width direction of the second upper wall 304 toward the bottom wall 5 of the tub body 2, a contact wall 306 composed of a plane including the vertical direction, and a continuous wall 307 continuous with the contact wall 306 and the second upper wall 304. An opening 308 is provided at a position facing the second upper wall 304. Further, the lower end edges of the pair of second side walls 305, 305 and the contact wall 306 are provided below the first bottom wall 301. As shown in FIG. 6, the second upper wall 304 is provided to extend on the same plane as the first upper wall 303, and the pair of second side walls 305, 305 are provided to extend on the same plane as the pair of first side walls 302, 302. The contact wall 306 is configured to abut the water flowing into the upstream flow path portion 30 and guide the water toward the bottom wall 5 of the tub body 2.

[0032] As shown in FIG. 6, the pair of upstream fixing portions 32 are provided in a plate shape that protrudes in the width direction and faces the upstream outer wall 6 of the tub body 2. Each upstream fixing portion 32 is bolt-fixed to the upstream outer wall 6 in a state of facing the upstream outer wall 6 of the tub body 2. Thereby, the upstream parts 3 are fixed to the tub body 2.

[0033] As shown in FIGS. 1 and 3, the downstream flow path portion 4 is connected to protrude from the other end side of the tub body 2 and is formed to extend linearly. As shown in FIG. 3, this downstream flow path portion 4 includes rectangular plate-shaped downstream side wall bodies 41 (downstream side walls) arranged to face each other, and a downstream fixing portion 42 that is continuous with the downstream side wall bodies 41 and is formed to extend by bending.

[0034] As shown in FIG. 2, each downstream side wall body 41 is provided in contact with a pair of inner surfaces in the groove width direction of the vertical drainage groove 101 in a state where the downstream flow path portion 4 is fixed to the tub body 2. Thereby, the downstream flow path portion 4 is stably fixed to the tub body 2 and the vertical drainage groove 101.

[0035] As shown in Fig. 3, the downstream fixing portion 42 is provided in a plate shape facing the downstream outer wall 7 of the box body 2. Further, a long hole 43 is formed in the downstream fixing portion 42 and extends in the width direction for inserting the screw 11. By forming the long hole 43 in the downstream fixing portion 42, the width dimension of the downstream flow path portion 4 with respect to the box body 2 can be adjusted.

[0036] The procedure for assembling such a bypass drainage mechanism 1 to an existing drainage mechanism 100 will be described with reference to Figs. 2 and 3. In this embodiment, the case where the gradient of the slope S is 1:1.2 and the groove width of the vertical drainage groove 101 is 250 mm will be described.

[0037] First, drive an anchor around the collecting box 103 in the existing drainage mechanism 100, overlap the box body 2 on the collecting box 103, and fix the box body 2 around the collecting box 103. In this way, the box body 2 is installed on the collecting box 103.

[0038] After that, bring the upstream flow path portion 30 of the upstream part 3 closer to the vertical drainage groove 101. Subsequently, oppose the upstream fixing portion 32 to the upstream outer wall 6 of the box body 2, and bolt-fix the upstream fixing portion 32 on the periphery of the upstream opening 60. In this way, the upstream part 3 is fixed to the box body 2 and the upstream part 3 is installed in the vertical drainage groove 101 of the bypass drainage mechanism 1. At this time, the upstream flow path portion 30 is provided with a slope gentler than the slope of the vertical drainage groove 101.

[0039] Further, the downstream fixing portion 42 of the downstream channel portion 4 is opposed to the downstream outer wall 7 of the box body 2, and the downstream fixing portion 42 is bolt-fixed by overlapping it with the peripheral edge of the downstream opening 70. At this time, the screw 11 is inserted into the downstream outer wall 7 in advance, and by moving each downstream side wall body 41 within the long hole 43 of the downstream fixing portion 42, the width dimension of the downstream channel portion 4 is adjusted, and each downstream side wall body 41, 41 of the downstream channel portion 4 is brought into contact with a pair of inner surfaces in the groove width direction of the vertical drainage groove 101. In this state, as shown in FIG. 8, the downstream channel portion 4 brings the lower end edge 4b of the downstream channel portion 4 close to the boundary position between the vertical drainage groove 101 and the normal plane S, and fixes it to the vertical drainage groove 101 using the L-shaped metal fitting L (shown in FIG. 2). Then, the downstream channel portion 4 is fixed to the box body 2, and the downstream channel portion 4 is installed in the vertical drainage groove 101 of the bypass drainage mechanism 1. In this way, the assembly of the bypass drainage mechanism 1 to the existing drainage mechanism 100 is completed.

[0040] Next, the operation and effect of this embodiment will be described.

[0041] The rainwater (water) flowing in the vertical drainage groove 101 branches and flows into the upstream channel portion 30, and is guided by the guide channel portion 31. The water abuts against the abutting wall 306 of the guide channel portion 31, abuts against the second upper wall 304, the pair of second side walls 305, 305, and also abuts against the first upper wall 303 (covering portion) that covers the upstream channel portion 30, and is bounced back and flows out from the opening 308, and heads towards the bottom wall 5. Also, a part of the water abuts against the bounce prevention lid 10 and is bounced back and heads towards the other end side (downstream). In this way, in this embodiment, due to the provision of the second upper wall 304, the pair of second side walls 305, 305, the abutting wall 306, the first upper wall 303, and the pair of bounce prevention lids 10, 10 that constitute the guide channel portion 31, the flow path of the inflowing water is changed without the water splashing in all directions, and the water is guided towards the bottom wall 5 in a state where its momentum is weakened.

[0042] Thereafter, the water is rectified by a pair of downstream facing walls 81, guided by the inner walls 9, and induced to the downstream opening 70 (the other end side opening). Thereafter, part of the water is drained from the notch 53 into the vertical drainage groove 101, and the other part is guided to the downstream flow path section 4 and drained into the vertical drainage groove 101. In such an embodiment of the present invention, the water staying inside the box body 2 is rectified by the pair of downstream facing walls 81 and the pair of inner walls 9, 9, and quickly drained from the notch 53 and the downstream flow path section 4 into the vertical drainage groove 101. According to this, rainwater (water) can be retained inside the bypass drainage mechanism 1 for a long time, and by controlling the amount of rainwater flowing into the existing drainage mechanism 100, overflow to the surroundings can be suppressed.

[0043] Note that the present invention is not limited to the above-described embodiment, includes other configurations and the like that can achieve the object of the present invention, and modifications and the like as shown below are also included in the present invention.

[0044] In the above-described embodiment, the upstream part 3 has the upstream flow path section 30, the guide flow path section 31, and the upstream fixing section 32 and is integrally configured, but the present invention is not limited to this. The upstream flow path section 30 and the guide flow path section 31 may be separate bodies. In this case, the upstream flow path section 30 and the guide flow path section 31 may be provided separately, or the guide flow path section 31 may be integrally fixed to the box body 2.

[0045] Also, in the above-described embodiment, the guide flow path section is composed of a plane including the vertical direction and has a contact wall 306 that contacts the water flowing into the upstream flow path section 30, but the present invention is not limited to this. The contact wall only needs to be configured to contact the water flowing into the upstream flow path section 30, and for example, it may intersect the bottom wall 5. That is, it does not necessarily have to be composed of a plane including the vertical direction.

[0046] In addition, in the embodiment, the case where the groove width of the vertical drainage groove 101 is 250 mm has been described, but the present invention is not limited thereto. FIG. 7 is a perspective view showing a modified example of the upstream channel portion 30A (30) constituting the bypass drainage machine groove 1A (1). For example, when the groove width of the vertical drainage groove 101 is 300 mm, as shown in FIG. 7, with respect to the upstream channel portion 30A of the upper part 3A, the width dimension of the upstream channel portion 30A may be formed so as to gradually increase toward the upstream side. That is, the first upper wall 303A (covering portion) and the first bottom wall may be formed in a trapezoidal shape in plan view, and the upstream channel portion 30A may be formed in a cylindrical shape with a trapezoidal cross section. According to this, even when the groove width of the vertical drainage groove 101 is different, the bypass drainage machine groove 1A (1) can be made to correspond.

[0047] In addition, in the embodiment, the case where the slope of the slope S is 1:1.2 has been described, but the present invention is not limited thereto. FIG. 8 is a perspective view showing a modified example of the downstream channel portion 4B (4) constituting the bypass drainage machine groove 1B (1). When the slope of the slope S is 1:1.2, the lower edge 4b of the downstream channel portion 4 is fixed close to the boundary position between the vertical drainage groove 101 and the slope S as shown by the solid line in FIG. 8. However, when the slope of the slope S is 1:1.5, as shown by the dashed line in FIG. 8, the lower edge 4b of the downstream channel portion 4B may be fixed to the vertical drainage groove 101 in a state of being close to the bottom of the vertical drainage groove 101 (inserted state). According to this, the downstream channel portion 4 can be fixed to the vertical drainage groove 101 in a stable state.

[0048] In addition, the best configurations, methods, etc. for carrying out the present invention are disclosed in the above description, but the present invention is not limited thereto. That is, the present invention has been particularly shown and described mainly with respect to specific embodiments, but without departing from the technical idea and the scope of the object of the present invention, those skilled in the art can make various modifications to the above-described embodiments in terms of shape, material, quantity, and other detailed configurations. Therefore, the descriptions limiting the shape, material, etc. disclosed above are exemplified for facilitating the understanding of the present invention and do not limit the present invention. Thus, the descriptions using the names of members with some or all of the limitations on those shapes, materials, etc. removed are included in the present invention.

Explanation of Signs

[0049] 1, 1A, 1B Bypass drainage mechanism 2 Bucket body 30 Upstream flow path section 31 Guide flow path section 303 First upper wall (covering part) 304 Second upper wall (upper wall) 305, 305 Pair of second side walls (pair of opposing walls) 306 Contact wall 4 Downstream flow path section 5 Bottom wall 53 Notch 8R, 8L Pair of outer walls 9, 9 Pair of inner walls 10, 10 Anti-rebound lids 41, 41 Pair of downstream side wall bodies (pair of downstream side walls) 70 Downstream opening (other end side opening) 80, 80 Pair of outer wall bodies 82 Pair of downstream opposing walls 101 Vertical drainage groove 102 Horizontal drainage groove S Slope P Center line (line connecting one end to the other end)

Claims

1. A bypass drainage machine trench installed at the intersection of a vertical drainage trench and a horizontal drainage trench formed on a slope surface, a box-shaped trough body installed overlapping above the intersection, an upstream flow path portion that is connected to one end side of the trough body and is formed to extend linearly to guide water flowing into the vertical drainage trench to the trough body, the trough body includes a bottom wall, and a pair of outer walls that are erected from the bottom wall and are provided on both sides of a line connecting one end to the other end of the trough body, the separation dimension of the pair of outer walls is formed to be larger than the width of the upstream flow path portion at any position from one end to the other end of the trough body, the upstream flow path portion is provided with a slope gentler than the slope of the vertical drainage trench, A bypass drainage machine trench characterized in that it is provided protruding into the trough body and includes a guide flow path portion for guiding water flowing into the upstream flow path portion toward the bottom wall.

2. The guide flow path portion includes a contact wall for contacting water flowing into the upstream flow path portion, an upper wall facing the bottom wall, a pair of opposing walls opposing each other across a line connecting one end to the other end of the trough body, and an opening opening toward the bottom wall. The bypass drainage machine trench according to claim 1, characterized by comprising:

3. The bypass drainage machine trench according to any one of claims 1 or 2, characterized by comprising a covering portion covering the upper surface of the upstream flow path portion.

4. The bypass drainage machine trench according to any one of claims 1 to 3, characterized in that bounce prevention lids facing the bottom wall are respectively provided on the one end side of the pair of outer walls.

5. It is connected to the other end side of the trough body and includes a downstream flow path portion for guiding the water accumulated in the trough body to the vertical drainage trench, the downstream flow path portion is configured to have a pair of downstream side walls facing each other, The trough body includes an other end side opening for connecting the pair of downstream side walls, and a notch portion formed by notching the bottom wall so as to be continuous with the other end side opening. The bypass drainage machine trench according to any one of claims 1 to 4, characterized by comprising:

6. The pair of outer walls include a pair of outer wall bodies formed such that the separation dimension between the pair of outer walls is constant, and a pair of downstream facing walls provided on the other end side of the pair of outer wall bodies and obliquely provided so as to approach each other as they move away from the one end, and the bypass drainage machine trench according to any one of claims 1 to 5, characterized in that it comprises the same.

7. It is provided with a downstream flow path portion connected to the other end side of the box body and guiding the water accumulated in the box body to the vertical drainage groove. The downstream flow path portion is configured to have a pair of downstream side walls facing each other. It includes a pair of inner walls provided to project in an arc shape inside the box body. The bypass drainage machine trench according to claim 6, characterized in that one end of the inner wall is connected to the downstream facing wall, and the other end of the inner wall is connected to the downstream side wall.

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