Drainage groove material

Abstract

To provide a drainage groove material which effectively suppresses the generation of impact noise generated when wheels or casters of a cart, wheelchair, walking aid, carry bag, or the like pass by and also ensures a sufficient amount of drainage.SOLUTION: A drainage groove material having a drain water groove that is installed on a floor surface and allows drain water from a drain hose to flow therethrough includes a drain water groove, groove edges located on the right and left sides of the drain groove, and a groove material edge located on the outside of the groove edge. The drain water groove is composed of a drain water groove bottom surface and an inner upright surface of the groove edge. A lid is attached to cover the drain water groove from above. The difference (step) between the height of the lowest point of the upper surface of the groove material edge and the height of the highest point of the upper surface of the lid is 2.4 mm or more and less than 4.0 mm, and the cross-sectional area of a drainage space formed between the drainage groove material and the lid is 100 mm2 or more and 150 mm2 or less.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a drainage channel material for draining water from a drain hose. [Background technology]

[0002] In apartment complexes and other collective housing, outdoor units of air conditioners are installed outdoors, such as in common corridors or verandas. Drain water from the outdoor units is discharged into the corridor or onto the floor through a drain hose. If drain water is allowed to flow onto the floor of a corridor or balcony, it will spread and attract dust or sand, causing dirt or stains on the corridor or floor, and mold to grow. In addition, the corridor or floor will become slippery when it gets wet, making it more likely for pedestrians to fall. For this reason, a drainage material having a groove-shaped drainage channel has been provided.

[0003] Such drainage materials are laid between floor materials. In other words, the drainage materials are installed across common corridors or verandas. Therefore, when wheels or casters of dollies, wheelchairs, walking aids, carrier bags, etc. pass over the drainage materials, the wheels that rise above the drainage materials drop when they reach the bottom, making an impact noise.

[0004] In this regard, for example, Patent Document 1 (JP 2018-197434 A) discloses a drainage material that, in order to reduce noise generated when wheels pass over it, "has a drainage channel having a bottom and sides provided on both sides of the bottom so that the drain water flows along the longitudinal direction of the drainage material, the drainage channel has at least one wall portion that stands upright from the bottom and is formed along the longitudinal direction of the drainage material, and a groove portion that is formed between the wall portion and the side portion or between adjacent wall portions, and the height of the wall portion from the bottom is formed to be the same as the height of the side portion from the bottom, or is formed to be lower by a predetermined length than the height of the side portion from the bottom." However, with such drain materials, the drainage channel is exposed upward, and there is a risk that people, carts, and even the area around the drain material may become wet or dirty with drain water. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-197434 A Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, an object of the present invention is to provide a drainage channel material that effectively suppresses the generation of impact noise generated when wheels or casters of carts, wheelchairs, walking aids, carry bags, etc. pass by, while also ensuring sufficient drainage volume. [Means for solving the problem]

[0007] In order to solve the above problems, the drainage channel material of the present invention is A drainage channel material that is installed on a floor surface and has a channel through which drain water from a drain hose flows, The drainage groove is composed of a groove edge located on the left and right sides of the drainage groove, and a groove material edge located on the outside of the groove edge, The drainage groove is composed of a drainage groove bottom surface and an inner upright surface of the groove edge, A lid is attached to close the drain from above; It is characterized by:

[0008] In the drainage channel material of the present invention having such a configuration, sufficient drainage volume is ensured between the lid and the channel, while the lid isolates the channel from above, thereby preventing drain water from contaminating people, carts, and the area around the drainage channel material.

[0009] In the drain drainage groove material of the present invention, in a longitudinal section approximately perpendicular to the longitudinal direction of the drain drainage groove material, the difference (step) between the height of the lowest point of the upper surface of the edge of the groove material and the height of the highest point of the upper surface of the cover body is 2.4 mm or more and less than 4.0 mm.

[0010] According to the drainage ditch material of the present invention having such a configuration, steps are sufficiently suppressed, so that the impact noise generated when the wheels of a cart or the like pass through the drainage ditch material can be effectively suppressed.

[0011] In the drainage channel material of the present invention, the cross-sectional area of ​​the drainage space formed between the drainage channel material and the cover body is 100 mm in a vertical section substantially perpendicular to the length direction of the drainage channel material. 2 More than 150mm 2 The following is the result.

[0012] According to the drainage channel material of the present invention having such a configuration, it is possible to ensure a sufficient drainage volume that can cover the amount of drain water discharged from at least the outdoor units of two air conditioners.

[0013] Furthermore, in the drain drainage groove material of the present invention, it is preferable that the angle of inclination of the line connecting the lowest point of the upper surface of the groove material edge and the highest point of the upper surface of the cover body is greater than or equal to 4° and less than or equal to 7°.

[0014] According to the drainage ditch material of the present invention having such a configuration, the slope is sufficiently gentle so that the impact noise generated when the wheels of a cart or the like pass over the drainage ditch material can be effectively suppressed. Effect of the Invention

[0015] According to the present invention, while ensuring sufficient drainage between the lid and the drain, the lid isolates the drain from above, thereby preventing drain water from contaminating people, carts, and the area around the drain drain material. [Brief description of the drawings]

[0016] [Figure 1] 1 is a partially cutaway perspective view showing an example of an outdoor floor installation according to a representative embodiment of the present invention. [Diagram 2] FIG. 1 is a perspective view of a drainage system including a drainage channel material 1. [Diagram 3]It is a sectional view taken along line III-III of Fig. 2. [Figure 4] It is an explanatory view of the step and inclination angle of the drain gutter material 1. [Diagram 5] It is a partially enlarged view of Fig. 3. [Figure 6] It is a schematic view of the drain gutter material 1 and the floor material 3 laid on the floor surface 9. [Figure 7] It is an explanatory view of the inclination of the floor surface 9. [Figure 8] It is a schematic view for explaining the method of the cart passing sound test. [Figure 9] It is a schematic view for explaining the method of the caster resistance test.

Embodiments for Carrying out the Invention

[0017] Hereinafter, with reference to the drawings, representative embodiments of the drain gutter material according to the present invention will be described in detail. However, the present invention is not limited to what is shown in the drawings, and each drawing is for conceptually explaining the present invention, so the size, ratio of length to width, and quantity may be exaggerated or simplified as necessary for easy understanding. Further, in the following description, the same or corresponding parts are denoted by the same reference numerals, and duplicate descriptions may be omitted.

[0018] 1. Configuration of the drain gutter material 1 As shown in Fig. 1, the drain gutter material 1, the floor material 3, and the drain connector 5 are laid on the outdoor floor surface such as a common corridor or a veranda in an apartment building or the like. The drain gutter material 1 and the floor material 3 are fixed to the floor surface 9 by pasting or the like. The drain gutter material 1 is arranged such that its longitudinal direction (the direction of arrow L in Fig. 1) crosses the floor surface 9 and the downstream end faces the drain part 91. The floor material 3 is arranged on both sides of the drain gutter material 1. Examples of the floor material 3 include, but are not limited to, a floor sheet and floor tiles. The drain connector 5 is attached to the upstream end of the drain channel material 1, and connects a drain hose 81 extending from an outdoor unit 8 of the air conditioner to the drain channel material 1 (see Figs. 1 and 2).

[0019] Next, the drainage channel material 1 will be described in detail. For example, as shown in FIG. 3, the drain ditch material 1 is composed of a drain ditch 11 which is a drainage flow path, ditch edges 13 and 14 located on the left and right sides of the drain ditch 11, and ditch material edges 15 and 16 located outside the ditch edges 13 and 14.

[0020] For example, as shown in Fig. 4(1), the drain 11 is composed of a drain bottom surface 111 and inner sides 131, 141 of the groove edges 13, 14, and has a generally U-shaped or concave cross-sectional shape as a whole. Note that the inner sides 131, 141 are the inner surfaces of the groove edges 13, 14 that face the drain 11, and since they rise from both the left and right ends of the drain bottom surface 111, they can also be called inner standing surfaces.

[0021] Specifically, convex strips 113 may be provided on drainage channel bottom surface 111 to help rectify the flow of drainage water. Convex strips 113 are strip- or plate-shaped protrusions that continue in the length direction of drainage channel 11. The height of convex strips 113 is preferably, for example, 0.2 to 0.8 mm.

[0022] A plurality of ridges 113 may be provided. In this case, the number of ridges 113 is preferably, but not limited to, 3 to 20. Furthermore, the width of the ridges 113 (the length in the width direction of the drainage groove bottom surface 111) does not necessarily have to be uniform. For example, the width of the ridge 113 facing the leg 27 of the lid body 21 described later may be wider than the remaining ridges 113. Furthermore, the multiple protrusions 113 may be parallel to one another, may be formed continuously in the length direction, or may be formed discontinuously (discontinuously or at predetermined intervals).

[0023] In addition, it is desirable that the inner surfaces 131, 141 of the groove edges 13, 14 on both sides have fitting grooves 133, 143 formed in the longitudinal direction to receive and fit both end edges (fitting protrusions 25, 26) of the lid body 21 described below. This allows the lid body 21 and the drainage channel material 1 to be integrated or combined so as to be easily detachable, thereby preventing the lid body 21 from unintentionally coming off the drainage channel material 1 due to caster wheels, foot traffic, wind and rain, etc. The fitting grooves 133, 143 may be formed continuously in the length direction of the groove edges 13, 14, or may be formed discontinuously (discontinuously or at predetermined intervals).

[0024] Channel edges 15, 16 are disposed on the outer sides of the channel edges 13, 14. The channel edges 15, 16 are generally rectangular, and it is desirable that the upper surfaces thereof are generally flat and generally horizontal.

[0025] Sloping surfaces 151, 161 are provided on the inner sides of the groove edges 15, 16. The sloping surfaces 151, 161 are smoothly connected (to be substantially flush) with the cover surface 23 described below, thereby suppressing the generation of impact noise. The height of the inclined surfaces 151, 161 themselves is, for example, about 0.5 mm to 1.0 mm, and this is included in the height of the step, which will be described later.

[0026] The drainage channel material 1 is made by extrusion molding of a synthetic resin such as polyvinyl chloride resin, and is preferably made of soft polyvinyl chloride resin in particular.

[0027] The following are examples of dimensions of the drainage channel material 1. However, it goes without saying that the present invention is not limited to these dimensions. The width of the drainage groove 11 is, for example, not less than 50 mm and not more than 70 mm. The height of the inner surfaces 131, 141 of the groove edges 13, 14 (i.e., the depth of the drain groove 11) is, for example, not less than 2 mm and not more than 4 mm. The overall width of the drain drainage ditch material 1 including the ditch material edges 15, 16 is, for example, 70 mm or more and 90 mm or less. The total height of the drainage channel material 1 (excluding a cover body 21 described later) is, for example, 3 mm or more and 5 mm or less. The overall height of the drain channel material 1 with the cover 21 attached (hereinafter, sometimes referred to as the drain channel material 1 with cover) is, for example, 3 mm or more and 9 mm or less.

[0028] The drain material 1 is provided with a lid 21 so as to cover the drain 11. The lid 21 prevents the drainage water flowing down the drain 11 from being blown away by wind or from coming into direct contact with the drainage water when people walk, thereby preventing the floor surface 9 from getting wet and the resulting falls and dirt of people. In this embodiment, the lid 21 is separate from the drain material 1 and is detachably attached to the drain material 1 (see FIG. 5, for example), but it may be configured integrally with the drain material 1.

[0029] More specifically, as shown in FIG. 4(1), for example, the cover 21 is generally plate-shaped and includes a cover surface 23 and fitting protrusions 25, 26 protruding outwardly from both sides thereof. The cover surface 23 is inclined upward from both ends in the width direction toward the center so as to be high in the middle. In other words, the cover surface 23 bulges upward from the inclined surfaces 151, 161 of the groove material edges 15, 16, forming a smooth, approximately arc-like or approximately dome-like shape. This bulging shape suppresses the impact noise caused by the passing of wheels, while also playing a role in forming a drainage space V having a predetermined cross-sectional area (a vertical cross section approximately perpendicular to the length direction of the drainage groove material) between the drain groove 11 and the cover body 21 (see FIG. 5(B)).

[0030] The inventors have thoroughly studied the cross-sectional area V of the drainage space that is suitable for both suppressing impact noise and ensuring a predetermined amount of drainage, and have determined that it is approximately 100 mm 2 More than 150mm 2 The following has been found to be suitable: The bulging height of the cover surface 23 is, for example, not less than 0.5 mm and not more than 1.0 mm.

[0031] In this embodiment, the volume (sound pressure) of the impact sound is suppressed by setting the step and inclination angle, which will be described later, within appropriate ranges. Specifically, the step is the difference in height between the lowest part of the upper surface of the gutter edges 15, 16 and the highest part of the upper surface of the cover 21 in a cross section substantially perpendicular to the length of the drain gutter material 1. In Fig. 4(1), the height of the lowest part of the upper surface of the gutter edges 15, 16 is represented by (C), and the height of the highest part of the upper surface of the cover 21 is represented by (D). The inventors have thoroughly studied these height differences (steps) [(C)-(D)] that are suitable for suppressing impact noise, and have found that a difference of approximately 2.4 mm or more and less than 4.0 mm is suitable.

[0032] The inclination angle is the inclination R (with respect to the horizontal line) of the line connecting the lowest point (indicated by the symbol L in Fig. 4(2)) of the upper surface of the groove edges 15, 16 and the highest point (indicated by the symbol H in Fig. 4(2)) of the upper surface of the lid 21. The inventors have thoroughly studied the inclination R suitable for suppressing impact noise and have found that a value of approximately 4° to 7° is suitable.

[0033] Returning to the explanation of the lid 21, the fitting protrusions 25, 26 fit into fitting grooves 133, 143 of the inner surfaces 131, 141 of the groove edges 13, 14 (see, for example, FIG. 3). The fitting protrusions 25, 26 may be formed continuously in the length direction of the lid 21, or may be formed discontinuously (discontinuously or at predetermined intervals).

[0034] It is desirable that the width between the edges of the fitting protrusions 25, 26 of the lid body 21 (length (B) in FIG. 4(1)) is greater than the width between the outer edges of the fitting grooves 133, 143 of the drainage channel material 1 (length (A) in FIG. 4(1)). This makes it possible to suppress twisting and deformation of the lid surface 23, and to maintain the bulging shape of the lid body 21.

[0035] A leg 27 protruding downward may be provided on the underside of the lid 21. When the lid 21 is bent downward by a load from above, the lower end side of the leg 27 comes into contact with the drain groove 11, thereby preventing the lid 21 from further bending. The legs 27 may be formed continuously in the longitudinal direction of the lid 21, or may be formed discontinuously (discontinuously or at predetermined intervals).

[0036] A plurality of legs 27 may be provided along the width direction of the lid 21. In this case, the height (degree of protrusion) of the legs 27 may be uniform or may vary depending on the location. In the latter case, for example, the height of the central legs 27 may be greater so that the distance between each leg 27 and the drain groove 11 is approximately the same.

[0037] The upper surface of the lid body 21 may be provided with a protruding rib 29 that protrudes upward in order to ensure anti-slip properties when walking. The protruding rib 29 may be formed continuously in the length direction of the lid body 21, or may be formed discontinuously (discontinuously or at predetermined intervals). The height of the ridges 29 is preferably 0.3 mm or less from the viewpoint of suppressing impact noise when wheels pass over, and is more preferably about 0.3 mm from the viewpoint of compatibility with anti-slip properties.

[0038] The lid 21 is made by extrusion molding of a synthetic resin such as polyvinyl chloride resin, and is preferably made of soft polyvinyl chloride resin.

[0039] The following are examples of dimensions of the lid 21. However, it goes without saying that the present invention is not limited to these dimensions. The overall width of the lid body 21 including the fitting protrusions 25, 26 is, for example, 50 mm or more and 70 mm or less. The thickness of the lid 21 is, for example, not less than 1.5 mm and not more than 2.0 mm. The width of the cover surface 23 (excluding the fitting protrusions 25, 26) is, for example, 40 mm or more and 60 mm or less.

[0040] Next, the drain connector 5 that connects the drain hose 81 and the drain channel material 1 will be described. Drain water discharged from the outdoor unit 8 etc. flows through the inside of the drain hose 81 and is introduced into the drain groove 11 of the drain groove material 1. At this time, by connecting the tip of the drain hose 81 to the drain groove 11 via the drain connector 5, the drain water can be smoothly introduced from the tip of the drain hose 81 to the drain groove 11. Then, the drain water that flows into the upstream side of the drain groove 11 flows down the drain space V formed by the drain groove 11 and the cover body 21, and is discharged into the drain groove 11 in the corridor or the like (see FIG. 1).

[0041] The drain connector 5 includes a base 51 that is fitted into the fitting grooves 133, 143 of the drain channel material 1, and a hollow connection part 52 that rises from the base 51 to connect the drain hose 81. The base 51 has an opening (not shown), and the opening connects the connection part 52 to the underside of the base 51 (i.e., the channel 11 of the drain channel material 1).

[0042] 2. Installation of drainage ditch material 1 The procedure for laying the drainage channel material 1 on the floor surface 9 will be described. As shown in Fig. 7, a water gradient S is provided on the floor surface 92 from the living room side across the corridor and balcony to the outdoor drain 91. The water gradient S is generally 1 / 150 or more and 1 / 50 or less, and is usually about 1 / 100.

[0043] Two floor materials 3 made of synthetic resin or rubber and having a thickness of about 3.5 mm are attached to the subfloor surface 92 with a specified gap between them. The gap between each floor material 3 is the same width as the drainage groove material 1.

[0044] The back surface of the drain channel material 1 is adhered to the subfloor surface 92 exposed from the gap (see FIG. 6). At this time, if the cover 21 is a separate body from the drain channel material 1, it may be attached to the drain channel material 1 already, or it may be attached after installation is completed. Furthermore, by making at least one of the drain channel material 1 and the cover 21 from a soft synthetic resin, attachment is easy.

[0045] The edges of each floor material 3 and the edges of the drain drainage groove material 1 (groove edges 15, 16) are joined by thermal welding with synthetic resin, bonding with adhesives, welding, etc., thereby making the space between the floor material 3 and the drain drainage groove material 1 waterproof. Since the floor material 3 needs to be joined to the drainage channel material 1 in this manner, it is preferable that the floor material 3 be made of the same material as the drainage channel material 1.

[0046] From the viewpoint of eliminating steps and minimizing noise caused by the passing of casters, it is desirable that the top surface of the laid floor material 3 and the top surfaces of the groove edges 15, 16 of the drain drainage channel material 1 are at approximately the same height. Even if a height difference or step occurs, it is preferable that the top surfaces of the groove edges 15, 16 of the drain drainage channel material 1 are higher than the top surface of the floor material 3, and it is particularly preferable that the height difference be 1.0 mm or less.

[0047] 3. Implementation of various tests Test specimens No. 1 to 8 of the drainage channel material 1 were prepared, and tests were conducted on (1) drainage performance, (2) passing noise, and (3) caster resistance.

[0048] The dimensions of specimens No. 1 to 8 are as shown in Table 1 below, where (A) to (D) in Table 1 correspond to the symbols (A) to (D) in FIG. 4(1).

[0049] [Table 1]

[0050] (1) Drainage test The test method and conditions for the drainage test are as follows. That is, specimens No. 1 to 8 (length 1800 mm) of the drainage ditch material 1 are laid on a mortar base set to a gradient of 1 / 100, and water is poured into the drain 11 from a liquid supply pump via a connector. Here, a Cole-Parmer liquid supply pump Masterflex·7524-50 MASTERFLEX L / S digital economy drive was used as the liquid supply pump. Then, it is visually confirmed whether the test specimens No. 1 to 8 properly drained the water. Specifically, the flow state of the drainage water, and the seepage and leakage state of the drainage water from between the edge of the cover body 21 and the drain groove 11 are confirmed.

[0051] Here, tests were conducted with a water flow rate of between 100ml / min and 500ml / min, and the standard water flow rate was 150ml / min, calculated by multiplying 100ml / min, which is the maximum drainage rate of two air conditioners, by a safety factor of 1.5.

[0052] The drainage performance was evaluated using the following three-level scale. ◎: No seepage of drainage water between the edge of the cover 21 and the drain groove 11 ○: Drainage seeps out from between the edge of the lid 21 and the drain groove 11 (no leakage) ×: Drainage water leaks between the edge of the cover body 21 and the drain groove 11.

[0053] The test results are shown in Table 2 below.

[0054] [Table 2]

[0055] From Table 2, it can be seen that test specimens No. 2 to 8 have drainage properties that satisfy the specified standards.

[0056] (2) Bogie passing sound test The test method and conditions for the bogie passing sound test are as follows: As shown in Fig. 8, a floor is prepared by laying soft polyvinyl chloride floor material 3 and test pieces No. 1 to 8 of drainage channel material 1 on a smooth subfloor surface 92. A transport cart 71 is made to travel on the floor at about 3.3 km / h, which is the same as walking speed. Here, a dolly 202N (size 810 mm×510 mm, weight 17.5 kg, wheels: diameter φ130 mm, width 25 mm (contact surface), 4 wheels) manufactured by Trusco Nakayama Corporation was used as the dolly 71. However, no weight was placed on the dolly 71.

[0057] The maximum sound pressure (db) when a dolly 71 passes over test specimens No. 1 to 8 is measured by a sound pressure noise meter 72. As the measuring instrument 72, a precision sound level meter NL-62A (with calibration certificate) manufactured by Rion Co., Ltd. was used. Here, the criterion was whether the measured sound pressure was 5 dB or less relative to the sound pressure generated when the dolly 71 was run on a floor on which only the floor material 3 was laid. This test was carried out at environmental temperatures of 23°C and 5°C.

[0058] The test results are shown in Table 3 below.

[0059] [Table 3]

[0060] From Table 3, it can be seen that at an environmental temperature of 23°C, all of test specimens No. 1 to No. 8 meet the prescribed criteria, but at an environmental temperature of 5°C, only test specimens No. 1 to No. 4 meet the prescribed criteria.

[0061] (3) Caster resistance test The caster resistance test was carried out assuming a trolley 71 with a load of 100 kgf for all four wheels, and the test method and conditions were as follows: That is, a floor is prepared by laying floor material 3 and lidded drainage channel material 1 on a 300 mm square slate board. A caster (one wheel) with a load of 250 N is moved back and forth on the floor, and the state of the cover 21 from the drainage channel material 1, breakage, and scratches (caster trajectory) are visually evaluated.

[0062] The caster was subjected to two types of reciprocating motion, a swivel orbit and a reciprocating orbit, as shown in Figure 9(A) and (B), and each was subjected to 7,000 reciprocating motions. The swivel orbit test was performed in accordance with JIS A 1454 21.2.2. A-1. The casters used were reddish brown phenolic for the swivel path and rubber-covered wheels for the reciprocating path. The environmental temperature during the test was 23°C.

[0063] Here, caster resistance was evaluated using the following three-level scale. 〇: No problem △: The cover 21 cannot be removed, but the scratches are slightly noticeable. ×: The lid 21 came off and scratches were noticeable.

[0064] The test results are shown in Table 4 below.

[0065] [Table 4]

[0066] From Table 4, it can be seen that all of the test specimens No. 1 to No. 8 were without problems in the reciprocating trajectory test, but only the test specimens No. 1 to No. 4 were without problems in the swivel trajectory test.

[0067] Therefore, taking the above tests (1) to (3) together, it can be said that test pieces Nos. 2 to 4 meet the predetermined standards and are good. From this, the step is approximately 2.4 mm or more and less than 4.0 mm, and the cross-sectional area is approximately 100 mm 2 More than 150mm 2 It can also be seen that the inclination is preferably approximately between 4° and 7°.

[0068] Although typical embodiments of the present invention have been described above, the present invention is not limited to these, and various design modifications are possible. It goes without saying that such modified versions (variations) of the design are also included in the technical scope of the present invention. [Explanation of symbols]

[0069] 1 Drainage ditch material 3. Flooring 5 Drain connector 11. Drain 111 Bottom of drain 13,14 Groove edge 131,141 Inner surface 15,16 Grooved edge 21 Lid

Claims

1. A drainage channel material having a drain channel that is installed on a floor surface and allows drain water from a drain hose to flow, The drainage groove is composed of a groove edge located on the left and right sides of the drainage groove, and a groove material edge located on the outside of the groove edge, The drainage groove is composed of a drainage groove bottom surface and an inner upright surface of the groove edge, A cover is attached to close the drain from above, In a longitudinal section of the drainage groove material that is substantially perpendicular to the longitudinal direction of the drainage groove material, the difference (step) between the height of the lowest part of the upper surface of the edge of the groove material and the height of the highest part of the upper surface of the cover body is 2.4 mm or more and less than 4.0 mm; In a longitudinal section substantially perpendicular to the length direction of the drainage groove material, the cross-sectional area of ​​the drainage space formed between the drainage groove material and the cover body is 100 mm ２ 150mm or more ２ That is: A drainage ditch material characterized by the above.

2. The angle of inclination of the line connecting the lowest point of the upper surface of the groove edge and the highest point of the upper surface of the lid is 4° to 7°. The drainage channel material according to claim 1 .

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