JP6391133B1 - Drainage adjustment member - Google Patents

Abstract

[Problem] To provide a drainage adjustment member that makes it difficult to cause a decline in drainage function without maintenance, can be easily installed in an existing drainage groove, has fewer man-hours, is inexpensive, and is easy to carry To do. An unevenness is formed on the surface side substantially in parallel with the longitudinal direction, and is on the bottom surface of the drainage groove unit 1 including the upper lid body 10 provided with the water flow holes 14, that is, the water flow plate 20. It is a member that is fitted on the bottom surface portion 24, and the convex portion 51 is a resin member that partitions and forms a plurality of concave flow channels in the drainage groove unit 1. [Selection] Figure 1

Description

  The present invention relates to a drainage adjusting member used in a steel drainage groove that is installed on a road shoulder or the like and drains a road surface.

  Conventionally, a steel drainage groove unit is a hollow unit that is continuously arranged on a road shoulder or the like, guides and drains rainwater on the road surface to a drainage mass, and drains a large amount of rainwater or the like. For example, see Patent Document 1).

JP 2005-54491 A

  However, with conventional drainage adjustment members, it is difficult to perform maintenance such as cleaning to remove dust accumulated inside, especially on the shoulders of places where work is difficult, such as on bridges, in intersections, roads in tunnels, tracks, etc. When installed, there was a problem that maintenance was particularly difficult. On bridges, etc., there was a problem that it was necessary to make a scaffold and inspect the drainage mass using a PVC pipe, and it was bad in appearance and work. If the maintenance is not enough, there is a problem that as time passes, it becomes easy to rust, and mud gets clogged and grass grows and the drainage function is remarkably lowered.

  In order to solve this problem, in order to create a new steel drain, there has been a problem that welding technology is necessary due to a lack of engineers. Further, since distortion occurs due to the influence of welding heat during welding, there is a problem that correction is necessary to remove the distortion, and the number of man-hours that require technical skills increases.

  In addition, replacing the existing steel drainage channel with a new steel drainage channel has a problem that the construction period is long, the construction cost is high, and labor is required.

  If welding is added to the existing steel drainage groove for improvement instead of replacing it newly, it will be post-plating welding, so the quality of the welded part cannot be secured, and the back side is plated due to the influence of welding heat There has been a problem that there is a risk of burning and becoming susceptible to corrosion.

  Also, in order to improve the existing steel drainage ditch, it is not easy to carry because the steel is heavy to transport and install the steel to each road where the drainage ditch is installed. There is a problem that the work load is heavy, and various strengths need to be reexamined due to an increase in the weight of the drainage. Moreover, the shape of the existing steel drainage grooves is not uniform, and there is a problem that it is difficult to change the shape of the steel material in accordance with the shape of each drainage groove.

  In addition, the steel materials used are made to order if they are other than the standard size, so the construction period will be longer and the price will be higher, and when manufacturing by roll forming (cold rolling), the space between the rolls will be automated. There was a problem that the size was restricted due to the nature of roll forming, which was carried out using

  Therefore, the first object of the present invention is to solve the above-described problems, make it possible to make it difficult for the drainage function to deteriorate without maintenance, and can be easily attached to an existing drainage groove, The object of the present invention is to provide a drainage adjusting member that has few steps, is inexpensive, and is easy to carry.

In order to achieve the above object, the first aspect of the present invention is a member that is continuously fitted over the entire length in the longitudinal direction on the bottom surface of a drainage groove unit that includes an upper lid body provided with a water flow hole. The concave and convex portions are formed on the surface side substantially in parallel with the longitudinal direction, and the convex portion of 1 is located in the drain groove unit and is not located below the water flow hole. a flow path is defined and formed, channel width in accordance with the amount of waste water which has flowed to provide drainage adjustment member which is a resinous member that changes stepwise.

  According to the first aspect of the present invention, if the amount of water entering from the water flow hole is small, the range in which the drainage flows automatically is narrowed without adjustment, and if the amount of water entering from the water hole is large, the adjustment is performed. Since it is possible to widen the range of drainage automatically, it is difficult for sediment to accumulate, and it is light and can be installed without being welded simply by fitting it into an existing drainage groove unit. It is possible to make it difficult for the drainage function to be lowered even if it is not carried out, and it can be easily attached to an existing drainage groove, has fewer man-hours, is inexpensive, and is easy to carry. It is also easy to produce a drainage adjusting member that matches the shape of the existing steel drainage groove by changing the mold into which the resin is poured or by cutting a part of it.

  A plurality of the convex portions are provided and are formed at the same or different heights, and each of the concave flow channels is formed in a circular or polygonal flow channel cross section. The flow rate or flow velocity flowing in the drainage channel unit is adjusted by a concave channel that receives rainwater flowing into the drainage channel unit from the water flow hole and another concave channel that receives rainwater that has overflowed from the concave channel. It is preferable to do. The width of the flow path can be adjusted stepwise depending on the amount of water entering from the water flow hole.

  According to the present invention, it is possible to make it difficult for the drainage function to be lowered without maintenance, and it can be easily attached to an existing drainage groove, has fewer steps, is inexpensive, and is easy to carry.

It is a perspective view of Example 1 of a drainage adjustment member of the present invention. It is a right view of Example 1 of the waste_water | drain adjustment member of this invention. It is a right view of the flowing water plate before Example 1 installation of the waste_water | drain adjustment member of this invention. It is a right view of the flowing water plate after Example 1 installation of the waste_water | drain adjustment member of this invention. It is sectional drawing of the drainage groove unit which shows the example of attachment of Example 1 of the waste_water | drain adjustment member of this invention.

  EXAMPLES Hereinafter, although this invention is concretely demonstrated using an Example about this invention, this invention is not limited to these.

  The drainage adjustment member according to the first embodiment has a configuration in which the flow path width changes stepwise according to the amount of drainage flowing into the drainage groove unit, and therefore, it is possible to prevent a situation in which maintenance is required such as accumulation of mud. Is. Furthermore, since there is no need to weld steel ribs to the bottom surface of the drainage groove unit, distortion does not occur, it can be installed in existing drainage grooves, it is light and inexpensive, and it is shaped to match the shape of the drainage groove to be installed. It is easy to modify.

{Constitution}
FIG. 1 is a perspective view of Embodiment 1 of the drainage adjusting member of the present invention. FIG. 2 is a right side view of Example 1 of the drainage adjusting member of the present invention. The drainage adjusting member 50 according to the first embodiment of the present invention is a long member made of resin. The drainage adjusting member 50 is formed with unevenness on the surface side substantially parallel to the longitudinal direction. Specifically, in the drainage adjusting member 50, convex portions 51 and concave flow channels 52 are alternately formed on the surface side substantially in parallel with the longitudinal direction.

  The drainage adjustment member 50 is a wall portion 53 whose long side edges are bent upward on the surface side. More specifically, the wall portion 53a, the concave channel 52a, the convex portion 51a, the concave channel 52b, The convex portion 51b, the concave channel 52c, and the wall portion 53c are arranged in this order. The convex part 51 becomes a partition of each flow path. In the drainage adjustment member 50 according to the first embodiment, the number of the convex portions 51 is two, that is, the convex portions 51a and the convex portions 51b. Further, in the drainage adjustment member 50 of the first embodiment, the convex portion 51 is in the shape of a vertically long rectangular rib with a flat top surface. However, if the convex portion is convex, the top surface is sharply sharp even if the top surface is rounded. However, the shape of the cross-sectional view is not limited. In addition, the inner wall side of the wall portion 53 has the same thickness up to the base in the present embodiment, but may be a gentle curve or slope with the base side thickened. Further, in this embodiment, the concave flow channel 52 is a flat plate with a horizontally long rectangular shape in section when the concave upper surface is flat, and the flow channel cross section is a quadrangle, but it is a circular or polygonal flow channel cross section. As long as it is concave, the upper surface of the concave portion may be rounded and recessed, or may be asymmetrical, or asymmetrical. When there are a plurality of convex portions 51, they may be the same or different heights.

  The drainage adjusting member 50 according to the first embodiment of the present invention is made of ABS resin and is formed by processing by injection molding. The types of the resin are PS (polystyrene) resin, PP (polypropylene) resin, PE (polyethylene). ) Other resins such as resin, PVC (polyvinyl chloride) resin, PMMA (acrylic) resin, AS resin and the like, and the processing method may be other methods such as extrusion molding, blow molding and vacuum molding.

  FIG. 3 is a right side view of the flowing water plate before the first embodiment of the drainage adjusting member of the present invention is installed. The flowing water plate 20 is formed by bending a steel plate into a right-angled L-shape and further bending the front-side tip upward at a right angle so that the back side is the back portion 25, the bottom surface side is the bottom surface portion 24, and the wall portion where the front-side tip is raised is raised. As part 23. The bottom surface of the drainage adjusting member 50 according to the first embodiment of the present invention is flat.

  FIG. 4 is a right side view of the flowing water plate after the first embodiment of the drainage adjusting member of the present invention is installed. The drainage adjustment member 50 according to the first embodiment is placed and fitted on the bottom surface portion 24 of the running water plate 20. The longitudinal direction of the drainage adjusting member 50 is the same as the longitudinal direction of the flowing water plate 20.

  FIG. 5 is a cross-sectional view of a drainage groove unit showing an example of attachment of the first embodiment of the drainage adjusting member of the present invention. The drainage adjustment member 50 according to the first embodiment is a member that fits on the bottom surface of the drainage groove unit 1 including the upper lid body 10 provided with the waterflow holes 14, that is, on the bottom surface portion 24 of the waterflow plate 20. The convex portion 51 defines a plurality of concave flow paths in the drain groove unit 1.

  The drainage groove unit 1 is made of steel, and is a hollow unit for continuously draining rainwater on the road surface to a drainage mass by arranging the backside on the sidewalk side and the front side on the roadway side, and continuously arranging it on the road shoulder. It is particularly suitable for installation on bridges, in intersections, roads in tunnels, and in tracks. The drainage channel unit 1 also has a role as a curb, and the sidewalk is made higher than the roadway by pouring asphalt or the like into the back side of the drainage channel unit.

  The drainage groove unit 1 includes: (a) a bottom surface portion 24 through which drainage flows, a rising portion 23 that rises from an end portion of the bottom surface portion 24 and becomes a wall on the front side, and an end portion of the bottom surface portion 24 opposite to the rising portion 23. A flowing water plate 20 having a back surface portion 25 that rises, and (b) an upper lid body 10 that is placed on the flowing water plate 20 so as to be detachably provided as a lid and has a flowing water hole 14 formed therein. The drainage adjustment member 50 of the first embodiment can be fitted on the upper surface side of the bottom surface portion 24 of the first embodiment.

  Details are shown below. The upper lid body 10 is a guard plate that is formed in a right-angled S-shape by bending a steel plate into three surfaces continuously in a crank shape. That is, the upper lid 10 is continuous with the upper surface portion 11, the front surface portion 12 whose upper end is continuous with one end of the upper surface portion and is a surface perpendicular to the upper surface portion 11 downward, and the lower end of the front surface portion 12. A receiving surface portion 12 is formed as a surface perpendicular to the upper surface portion and the opposite side. A plurality of water flow holes 14 through which rainwater enters are formed in the corner portion formed by the front surface portion 12 and the receiving surface portion 13. In the present embodiment, the number of water holes 14 is eight, but the number of water holes is not limited thereto. Hereinafter, the front surface portion 12 side will be described as the front surface side of the drainage groove unit 1. In the present embodiment, the angle formed by the front surface portion 12 and the receiving surface portion 13 or the upper surface portion 11 is 90 degrees, but is not limited to this, and even if the lower portion of the front surface portion is oblique to the front side. It may be slanted in the direction in which the upper portion of the front portion protrudes to the front side.

  The drainage groove units 1 are arranged in a line at the end of the roadway, and are embedded so that the upper surface of the receiving surface portion 13 is flat with respect to the roadway surface, and adjacent drainage groove units are connected. The upper lid 10 and the flowing water plate 20 are formed by bending or roll forming to form each surface.

  On the back side of the upper lid body 10, a reinforcing plate 60 is welded to a back side portion formed by an angle formed by the front surface portion 12 and the receiving surface portion 13 so as not to overlap the water flow hole 14. A rib plate 30 is provided on the back side of the front surface portion 12 and the upper surface portion 11 so as to be perpendicular to the longitudinal direction of the drainage groove unit 1. Even when a car tire or the like is placed on the receiving surface part 13, a car tire or a car body hits the front face part 12, or a car tire or car body gets on the upper face part 11, the reinforcing plate 60 or the rib plate 30. This serves to protect the hollow drainage groove unit from being crushed. Moreover, the edge of the rib plate 30 is welded to the back side of the upper surface part 11 and the front surface part 12, and when the upper cover body 10 is closed, the side of the flowing water plate hits the side.

  The upper lid 10 is formed by bending the guard plate as described above. It arrange | positions so that a hollow area may be formed under the upper cover body 10 toward the lower part of the front side from the back side of the upper cover body 10, and the height of the front side front end is the same height as the receiving surface part 13 of the upper cover body 10 It is. That is, the upper lid 10 serves as a lid of the flowing water plate 20 whose upper side is open. An L-shaped reinforcing angle 73 is provided outside the rising portion 23, which is a bent portion on the front side of the flowing water plate 20, so as to protect the corner portion on the lower front side of the flowing water plate 20.

  The convex portion 51, the concave flow path 52, and the wall portion 53 of the drainage adjustment member 50 provided on the upper surface side of the bottom surface portion 24 of the water flow plate 20 are provided in parallel over the entire length in the longitudinal direction of the drainage groove unit. The drainage flowing through the drainage adjustment member 50 is guided to the drainage mass through the drainage adjustment members 50 respectively installed in the plurality of drainage groove units connected continuously in the longitudinal direction.

  An L-shaped front receiving angle 71 is welded to the inside of the rising portion 23 of the L-shaped flowing water plate 20, that is, the back surface side when viewed from the front side. The height of the wall portion 53 a of the drainage adjusting member 50 is a height that enters the lower portion of the front receiving angle 71. Since the drainage adjusting member 50 is made of resin, when the height of the wall portion 53a is too high, the height can be reduced easily or relatively cheaply than the steel material by cutting or mold adjustment. The front receiving angle 71 has one side on which the end of the receiving surface portion 13 is placed when the guard plate 10 is closed, and the other side welded to the front side front end back side of the flowing water plate 20. Further, an L-shaped back receiving angle 72 is welded to the upper inner side of the back surface of the flowing water plate 20, that is, the front surface side when viewed from the front side. The back surface receiving angle 72 has one side on which the end portion of the upper surface portion 11 is placed when the guard plate 10 is closed, and another side welded to the upper surface side of the back surface portion 25 of the flowing water plate 20.

  The upper lid body 10 and the flowing water plate 20 are connected by a chain (not shown) that connects the connecting plates 40 provided on the back side of the upper surface portion 11 of the upper lid body 10 and the inner wall side of the rear surface of the flowing water plate 20. Connection plates (not shown) used for bolting for connecting drainage groove units arranged side by side are provided on the left and right ends of the back surface 25 of the water flow plate 20. In addition, the upper part of the connection plate 40 connected to the flowing water plate 20 side is provided with a notch for sandwiching and holding the end portion of the upper lid body when the upper lid body 10 is opened upward.

  The upper lid body 10 is stabilized by placing the upper surface portion 11 on the rear surface receiving angle 72 and supporting the rear side of the rib plate 30 on the rear surface of the flowing water plate 20 and placing the receiving surface portion 13 on the front surface receiving angle 71. Held.

The lower part of the flowing water plate 20 covered with the upper lid body 10 is covered with a reinforcing angle 73.
An anchor pipe 90 is provided on the back side of the back surface portion 25 of the flowing water plate 20. In FIG. 5, the anchor pipes 90a and 90b are shown, but the chain is not shown. Since the upper lid 10 and the rib plate 30 are connected to each other at the upper corner of the rib plate 30 on the back side of the portion where the upper surface portion 11 and the front surface portion 12 of the upper lid body 10 intersect, a scallop 31 is provided. The lower end of the rib plate 30 is separated from the upper end of the convex portion 51. In the present embodiment, the height of the convex portion 51a is provided lower than the convex portion 51b, but is not limited thereto. The space formed by the back surface portion 25 and the bottom surface portion 24 of the flowing water plate 20, the lower end of the rib plate 30, and the receiving surface portion 13 of the upper lid 10 is a concave flow formed by partitioning a wall portion 53 a and a convex portion 51 a on the front side. The path 52a is a first flow path, and the concave flow path 52b defined by the convex portions 51a and 51b is a second flow path, and is a concave flow defined by the convex portions 51b and the wall portion 53b. The path 52c is a third flow path. Each concave flow channel is divided so as to share an upper space.

On the back side of the back surface portion 25 of the flowing water plate 20, that is, the back surface side of the drainage groove unit 1, three anchor pipes 90 are arranged side by side and are welded side by side. Each anchor pipe 90 has a cylindrical shape, and an L-shaped anchor bar is passed therethrough.

The drainage groove unit 1 is laid on the road shoulder with the upper surface of the receiving surface portion 13 being flush with the road surface of the roadway. The anchor bar is fixed to the anchor rebar on the sidewalk side so that the other end perpendicular to one end passed through the anchor pipe 90 protrudes at a right angle from the back surface of the drainage unit 1.

  The drainage groove unit 1 is installed on the ground so that the bottom surface 24 of the flowing water plate 20 and the bottom surface of the reinforcing angle 73 are in contact with the ground. Most of the drainage taken into the drainage groove unit 1 from the water flow hole 14 is first guided to the first flow path. When the amount of drainage increases, the amount overflowed from the first flow path overflows into the second flow path from the gap between the upper end of the convex portion 51a and the back surface of the receiving surface portion 13 which is the bottom of the upper lid body 10. Led. When the amount of drainage further increases, the amount overflowing from the second flow path gets over the upper end of the convex portion 51b, and the wastewater overflows into the third flow path and is guided. With this configuration, according to the present embodiment, the amount of space through which drainage flows can be adjusted according to the amount of rain. Since the drainage adjustment member 50 is made of resin, the cross-sectional shape and surface shape of the convex portion 51 and the concave flow passage 52 can be adjusted by cutting or adjusting the mold according to the amount of rain or the amount of earth and sand predicted at the place of installation. It can be changed easily or relatively cheaply than the steel material.

  The drainage capacity is a value obtained by multiplying the water flow cross-sectional area by the average flow velocity. If the flow rate is too high, surface wear or the like may occur, but if the flow rate is too low, sedimentation may occur. Assuming a standard rainfall intensity (3-year probability 10 minutes rainfall intensity) of 70 to 100 mm / h, the drainage groove strength is calculated, but there is not much rainfall in daily life, and 5 to 20 mm / h of rain falls. There are many cases. However, in a conventional drainage ditch assuming a rainfall of 70 to 100 mm / h, in the case of rain of about 5 to 20 mm / h, it is not possible to secure a sufficient flow rate for the earth and sand contained in the drainage to flow together. Tends to accumulate. When soil and sand accumulate, grass grows and drainage function declines. According to the present embodiment, when the amount of rain (approximately 20 mm / h or less) is drained, the first flow path drains, so that a sufficient flow rate can be secured, and when heavy rain falls (approximately 20 mm / h to 60 mm / h). In the case of heavy rain (about 60 mm / h or more), the second flow path is also automatically drained by using the third flow path. But it can prevent sedimentation.

In this embodiment, the length of the drainage groove in the longitudinal direction is 1.2 m, the depth of the receiving surface portion is 150 mm, the depth of the upper surface portion is 200 mm, and the height from the bottom bottom side of the flowing water plate to the rising edge on the front side. Is 70 mm, the thickness of each steel plate is 5 mm, the thickness of the drainage adjusting member 50 in the concave channel 52 is 5 mm, the height from the upper side of the bottom surface of the flowing water plate 20 to the lower end of the rib plate 30 is 60 mm, and the convex portion 51 a The height is 35 mm from the bottom surface, and the height of the convex portion 51 b is 40 mm from the bottom surface. The height from the lower surface of the reinforcing plate 60 welded to the lower portion of the receiving surface portion 13 of the upper lid body 10 to the upper surface of the concave flow channel 52 portion of the drainage adjustment member 50 is 60 mm. The gap at the top of the convex portion 51a is 15 mm. In this embodiment, the water collection width of the first concave flow channel is 150 mm, and the water collection widths of the second flow channel and the third flow channel are both 100 mm. However, the present invention is not limited to this. In this embodiment, the waste water flow rate may correspond with a range of at least 0.004m ³ /s~0.03m ³ / s. On a 50m long road, the runoff flow rate when the rainfall is 20mm / h is 0.003m ³ / s, the runoff flow rate when the rainfall is 50mm / h is 0.006m ³ / s, and the rainfall is 110mm / h. Since the outflow flow rate is calculated as 0.0138 m ³ / s, the flow rate calculated by adding the safety factor and the like from the drainage flow rate is 0.595 m / s when the rainfall is 20 mm / h, and the rainfall is 50 mm / h. Is 0.774 m / s, and when the rainfall is 110 mm / h, it is 0.622 m / s. Therefore, according to the present embodiment, the water flow cross-sectional area can be automatically changed according to the rainfall, so that it is possible to prevent the flow velocity from becoming too large or too small.

  The number of convex portions is not limited to two, but may be three or more, but is preferably two because the drainage space is narrow. Even if the height of the convex portion 51b is lower than that of the convex portion 51a, two-stage adjustment is possible depending on the amount of water that has flowed in. However, in this embodiment, the convex portion 51b is higher than the convex portion 51a. Since it can adjust in a step, it is more preferable. When the number of convex portions is three or more, it is preferable to provide the convex portions close to the back surface portion 25 so as to be higher.

In this embodiment, since the flowing water plate 20 is buried in the soil, a steel material used in a severe corrosive environment of type 2 55 (symbol HDZ55) of JIS H8641 is applied to the JIS standard. However, even if there is no thickness of 6 mm, even if it is 5 mm thick after adjusting the components, 550 g / m ² of zinc, which is an amount that does not normally adhere unless it is 6 mm thick, can be attached to the steel sheet. The weight can be reduced while maintaining the corrosion resistance. Further, by using a hot dip zinc-aluminum-magnesium alloy plated steel plate having higher resistance than HDZ55, it is possible to maintain corrosion resistance even if it is as thin as 3.2 mm.

{effect}
According to this embodiment, if the amount of water entering from the water flow hole is small, the range of automatically flowing the drainage is narrowed without adjustment, and if there is a large amount of water entering from the water flow hole, there is no need to adjust. Since the range of drainage can be automatically increased, sediment and so on are less likely to accumulate, and it is light and can be installed without being welded simply by fitting into an existing drainage groove unit. Therefore, according to this embodiment, it is possible to make it difficult for the drainage function to be lowered without maintenance, and it can be easily installed in an existing drainage groove. , Less man-hours, cheap and easy to carry. It is also easy to produce a drainage adjusting member that matches the shape of the existing steel drainage groove by changing the mold into which the resin is poured or by cutting a part of it. Furthermore, in the present embodiment, since the convex portion 51b is higher than the convex portion 51a, the width of the flow path according to the amount of water entering from the water flow hole can be adjusted in three stages.

  According to this embodiment, it is possible to directly fit into an existing steel drainage groove without creating a new steel drainage groove, so that welding technology is not required for fitting, and distortion caused by the influence of welding heat is generated. This eliminates the need for correction to remove distortion, prevents an increase in the number of man-hours that require technical skills, requires a shorter construction period, requires less construction costs, and requires less labor. Since welding after plating is unnecessary, the problem of corrosion of the steel drainage groove is less likely to occur. Since the drainage adjustment member is light, it is easy to carry and the transportation cost and work load are light, and it is not necessary to review various strengths even in the case of additional installation. Also, there are fewer size restrictions.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. In addition, the constituent elements of the above embodiments can be arbitrarily combined without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Drain groove unit 10 Upper cover body 11 Upper surface part 12 Front surface part 13 Reception surface part 14 Flow hole 20 Flowing plate 23 Standing part 24 Bottom surface part 25 Back surface part 30 Rib plate 31 Scallop 40 Connection plate 50 Drainage adjustment member 51a, b Convex part 52a, b, c Recessed channel 53a, b Wall 60 Reinforcement plate 71 Front receiving angle 72 Back receiving angle 73 Reinforcing angle 90a, b Anchor pipe

Claims (2)

A member that is continuously fitted over the entire length in the longitudinal direction on the bottom surface of the drainage groove unit provided with an upper lid body provided with a water flow hole, and has unevenness formed on the surface side substantially parallel to the longitudinal direction. , one of the protrusions in the drainage groove unit, and a concave channel which is not located under the recessed channel and the water flow hole located under the running water hole is defined and formed, the flow path according to wastewater flowed A drainage adjustment member characterized by being a resin member whose width changes stepwise . A plurality of the convex portions are provided and are formed at the same or different heights, and each of the concave flow channels is formed in a circular or polygonal flow channel cross section. The flow rate or flow velocity flowing in the drainage channel unit is adjusted by a concave channel that receives rainwater flowing into the drainage channel unit from the water flow hole and another concave channel that receives rainwater that has overflowed from the concave channel. The drainage adjustment member according to claim 1, wherein

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