JP3935485B2 - Anti-blocking eye plate for surface water drainage channel - Google Patents

Description

  The present invention relates to a clogging prevention pan for a surface water drainage channel that suppresses a decline in the function of a drainage channel installed on a landslide slope, and is suitable for a surface water drainage facility on a landslide slope.

  In general, surface water drainage is known as one of landslide prevention methods. This surface water draining method is a method of preventing the occurrence of landslides due to the infiltrated water by suppressing the surface water slope infiltration. That is, as shown in FIG. 3, the surface water drainer arranges a surface water drainage channel 50 whose upper side is continuously open in the landslide slope A in the longitudinal direction and downstream of the drainage channel 50. The end is connected to the outside of the landslide. Therefore, the drainage channel 50 collects surface water generated by rain or melting snow and drains it by quickly flowing outside the landslide area without penetrating the slope.

  However, the above construction method has a problem that it is difficult for the surface water drainage channel to maintain the surface water collecting and draining function for a long period of time.

  In other words, in this construction method, the cross-sectional area of the water flow decreases due to the fall of grass into the water channel and the accumulation of fallen leaves in the water channel, the drainage function of flowing from upstream to downstream as a drainage channel is impaired, and water from the water channel is lost. Overflow, infiltration of this overflowing water slope, erosion of the slope around the waterway, damage to the waterway, etc. occurred and became a big problem. At the same time, due to the above accumulation, the water collecting function of collecting surface water by flowing the surface water into the water drainage channel as a surface water drainage channel has also been impaired. That is, the predetermined range of the drainage channel upstream from the clogged portion due to the accumulation is filled with the accumulated water, so that the surface water can no longer flow into the drainage channel in this range, and the water collecting function Cannot be obtained.

  Therefore, the present invention solves the above-mentioned conventional problems, and secures the drainage function of the drainage channel, and provides a surface water drainage blockage prevention eye plate that can maintain the surface water collection function of the drainage channel for a long period of time. The purpose is to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 has an opening on the landslide slope that collects surface water flowing down the ground surface of the landslide slope and drains it from the landslide slope. In the drainage channel, the drainage channel is provided with an eyepiece main body which is obliquely partitioned with the transverse cross section of the drainage channel being up and down and the peripheral edge of one opening of the drainage channel as an upper end. The surface water drainage blockage-preventing pan is characterized by having a through hole that allows only surface water to pass into the partitioned lower drainage channel.

  According to a second aspect of the present invention, in the first aspect, the eye plate main body is a first hooking portion that is hooked to the one opening peripheral edge among the opening peripheral edges of the drainage channel facing each other. And the second latching portion latched on the periphery of the other opening, and the through hole is formed intermittently or continuously from the vicinity of the first latching edge portion downward. Provided.

  According to a third aspect of the present invention, in the first or second aspect, the eye plate main body has a size and weight that can be handled manually.

  According to this invention, the drainage function of the surface water drainage channel can be ensured and the surface water collecting function of the drainage channel can be maintained for a long period of time, regardless of the state of plant growth around the waterway. Become. That is, it is not a perforated lid-like member that simply covers the upper opening of the drainage channel, but also a grid-like member that ensures a flow path space that horizontally partitions the drainage channel and excludes foreign matter entering from the outside. Rather, it is connected to the periphery of one opening of the drainage channel, and the cross section of the drainage channel is obliquely partitioned, and only a surface water is passed through the partitioned lower part. Therefore, foreign matter can be accumulated on the inclined upper surface of the anti-blocking eye plate and held on the upper part of the drainage channel, and the drainage function can be secured. The surface water collecting function can be maintained until the upper part of the eye plate is covered with this deposit.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 (a) is a schematic perspective view showing the entire configuration of a clogging prevention dish for a surface water drainage channel, and FIG. 1 (b) is a schematic perspective view showing the drainage channel and the clogging prevention plate only as a single unit. FIG. 2A is a schematic cross-sectional view showing a detailed configuration of the clogging prevention dish, and FIG. 2B is a schematic view showing a deposit deposition process using the cross-sectional view. .

  That is, as shown in FIG. 1 (a), the surface water drainage channel 50 is formed by arranging a U-shaped groove on the landslide slope A in a longitudinal and transverse manner. That is, the U-shaped groove extends across the inclined surface of the landslide slope A, that is, in a direction substantially intersecting the inclined direction of the inclined surface, and the bottom surface in the groove is downstream as the drainage channel 50. It is installed so as to be lowered toward the side. Further, the U-shaped groove is continuously installed so as to reach the outside of the landslide slope A, or its downstream end is connected to a secondary water channel or the like (not shown).

  The U-shaped groove is formed by embedding an U-shaped tube 51 opened upward so that the opening is slightly lower than the ground surface. The U-shaped cross-sectional shape is installed so as to be continuous in the longitudinal direction of the water channel. That is, the U-shaped tube 51 is configured such that two vertical side wall surfaces 51a and 51b opposed to each other and a bottom surface 51c in which the lower ends of the side wall surfaces 51a and 51b are connected horizontally are integrally formed. Made of concrete or concrete.

  Further, the U-shaped pipe 51 is embedded so that the opening peripheral edges 51A and 51B at the upper end thereof are located at a predetermined position below the ground surface on which the landslide slope A is formed, and one open peripheral edge 51A and the open peripheral edge 51A. , And between the other opening peripheral edge 51 </ b> B and the ground surface around the opening peripheral edge 51 </ b> B, a step projecting upward is not generated. Therefore, the surface water that flows down the ground surface of the landslide slope A naturally flows into the U-shaped pipe 51. In addition, as shown with a reference numeral in the figure, one opening peripheral edge which is basically the surface water inflow side facing the higher side of the landslide slope A and continuously serving as the ground surface is 51A. The other opening peripheral edge facing the lower side of the landslide slope A is 51B.

  Therefore, according to the surface water drainage channel 50 formed by arranging the U-shaped pipe 51 thus configured on the landslide slope A in a predetermined manner, the surface water generated in the landslide slope A is inclined to the landslide slope A. It flows down the ground surface and flows into the nearest drainage channel 50. Then, the surface water that has flowed into the drainage channel 50 flows down through the drainage channel 50 to the downstream side of the drainage channel 50 and is discharged outside the landslide area. For this reason, it is possible to prevent concentrated surface water from penetrating into the ground in a predetermined range on the landslide slope A.

  However, in the landslide area, it is suitable for the growth of plants because surface water is generated, and vegetation is often overgrown, causing the fall of grass into the drainage channel 50, accumulation of fallen leaves, etc. Many cases where the drainage channel 50 was blocked by these were recognized. Therefore, in order to prevent the drainage channel 50 from being blocked due to these, the drainage channel 50 may be covered with a lid (not shown) in which a large number of holes through which only surface water can pass are formed, as in a general road gutter. So I thought. However, since the lid hole is likely to close in a short time due to the accumulation of fallen grass and fallen leaves, the surface water collecting function as the surface water drainage channel 50 is impaired. That is, when the upper opening of the drainage channel 50 is covered with a lid, the hole in the lid is easily blocked by grass or fallen leaves. The water function cannot be obtained.

  Then, the water collection as surface water drainage channel 50 is carried out by arranging blockage prevention eye plate 1 of this embodiment in the location of drainage channel 50 as a place where blockage of drainage channel 50 is concerned for the above-mentioned reason. While maintaining the water collection function for a long time by suppressing the deterioration of the function, the drainage function is ensured.

  That is, as shown in FIGS. 1 (a), 1 (b), and 2 (a), the clogging prevention pan 1 of the surface water drainage channel 50 of this embodiment has a large number of grid-like slits 2a as through holes. Mainly composed of a main plate body 2 formed in a substantially long plate shape and a pair of latching portions 3 and 4 for holding the main plate body 2 in a drainage channel 50 in a predetermined inclined posture. The first hooking portion 3 is provided on one peripheral edge which is the long side of the eye plate main body 2, and the second hooking portion 4 is formed to be connected to the peripheral edge which is the other long side, The length in the vertical direction is ensured according to the inclination angle of the eye plate main body 2, and it is provided via an interposing portion 5 having a long plate surface extending in the vertical direction.

  Therefore, if the occlusion prevention plate 1 can hook these first and second latching portions 3 and 4 to the opening peripheral edges 51A and 51B of the U-shaped pipe 51 that forms the surface water drainage channel 50, respectively, It can be installed at any location on the road 50. That is, the first latching portion 3 is latched on one opening peripheral edge 51A that is basically on the surface water inflow side toward the higher side of the landslide slope A, and is directed toward the lower side of the landslide slope A. It is preferable that the second latching portion 4 is latched on the other opening peripheral edge 51 </ b> B and the blockage prevention eye plate 1 is installed in the drainage channel 50. Therefore, in the blockage preventing eye plate 1, one of the edges of the eye plate body 2 is located at the upper end of the opening peripheral edge 51 </ b> A of the water channel 50 with respect to the transverse section of the water channel 50, and the edge of the other eye plate body 2. Is disposed in the drainage channel 50 in an inclined posture located on the lower side on the side surface in the drainage channel 50.

  That is, the first hooking portion 3 is provided as a rib-like member on one peripheral edge of the eye plate main body 2 and is connected to the peripheral edge to ensure a predetermined angle with the eye plate main body 2. Are provided continuously in the longitudinal direction and protrude a predetermined length. The interposition part 5 is formed in a planar shape, is provided so as to be joined to the other peripheral edge of the eye plate main body 2, extends upward in a substantially vertical direction, and is connected to the upper end of the interposition part 5. The 2nd latching | locking part 4 is provided as a rib-shaped member which ensured the angle orthogonal to the mounting part 5. As shown in FIG. That is, the second hooking portion 4 is continuously provided at the upper end of the interposition portion 5 in the longitudinal direction of the interposition portion 5, that is, the eye plate main body 2, and protrudes a predetermined length.

  The interposition part 5 is formed in the shape of a long plate having the same length as the longitudinal direction length of the eye plate main body 2, and according to the inclination posture of the eye plate main body 2, that is, the inclination angle of the eye plate main body 2 itself. Accordingly, the length in the vertical direction, which is the width dimension, is set. In other words, in this embodiment, the main dish body 2 has a drainage channel whose upper end is substantially the same height as the opening peripheral edge 51A on the surface water inflow side and whose lower end faces the inflow side from the vicinity of the opening peripheral edge 51A. The 50 side wall surfaces 51b are inclined so as to be in contact with approximately half of the depth of the side wall surface 51b, and the length of the interposition part 5 in the vertical direction is set so as to be in this inclined posture. That is, the vertical dimension of the interposition part 5 is set to be longer as the eyepiece body 2 is deeply inclined, that is, the inclination angle is increased, and is set to be shorter as the shallow inclination position, that is, the inclination angle is decreased. Yes.

  Therefore, when the occlusion prevention dish 1 configured in this way is installed in the drainage channel 50 in a predetermined direction, the lower surface of the first hooking portion 3 is basically surface water that the drainage channel 50 has. Is uniformly in contact with the upper end surface of one opening peripheral edge 51A as the side into which the air flows, and the lower surface of the second hooking portion 4 is in uniform contact with the upper end surface of the other opening peripheral edge 51B. Further, the interposition part 5 comes into surface contact with the side wall surface 51 b of the drainage channel 50.

  The eye plate main body 2 is formed with a large number of elongated slits 2a in a vertically long shape as through holes. These slits 2 a are formed in a continuous linear long hole, and are provided so as to penetrate from the upper surface to the lower surface, which is the thickness direction of the eye plate main body 2. The slit 2a has a length direction set in a direction orthogonal to the opening peripheral edge of the drainage channel 50, and the length is set to a length over almost the entire area from the upper end to the lower end of the eye plate main body 2. Yes. The slits 2 a are arranged in parallel to each other at a predetermined interval in the length direction of the eye plate main body 2. Therefore, since these slits 2a are formed toward the natural flow direction of running water on the main plate body 2, the surface water flowing into the drainage channel 50 along the longitudinal direction of the slits 2a is smooth. Will flow.

  The width of the slit 2a is such that the width of the slit body 2 between the slits 2a is such that the width of the slit 2a is such that almost all foreign matter blocking the drainage channel 50 other than the surface water is blocked and only the surface water is allowed to pass. The width of the portion is secured so that sufficient rigidity and strength can be maintained on the eye plate main body 2 so as to support sediments such as grass and fallen leaves. Therefore, the surface water that has flowed into the drainage channel 50, depending on the direction and the momentum of the surface water, while flowing along the slit 2a formed in the main plate body 2, while being appropriately in the middle of the slit 2a, It passes through the slit 2 a and reaches the drainage channel 50 located below the eye plate 1. In particular, the surface water mixed with foreign matter is separated from the foreign matter by the slit 2a, and only the surface water flows into the drainage channel 50, while the foreign matter is left on the eye plate. For this reason, only surface water passes through the slit 2 a formed in the eye plate main body 2 and flows into the lower part in the drainage channel 50.

  In addition to the fact that the first and second latching portions 3 and 4 constituting the eye plate 1 are in linear contact with the opening periphery of the U-shaped tube 51 by its own weight, Since the interposition part 5 which comprises the eye plate 1 is in surface contact with the side wall surface of the drainage channel 50, the contact area between both 1 and 50 can fully be enlarged. For this reason, these contact surfaces can sufficiently secure a resistance force against an external force that tries to move the eye plate 1 in a direction parallel to the surface, and can maintain the installed posture stably. it can. Therefore, even when the drainage channel 50 is filled with the surface water flowing through the drainage channel 50, the surface plate 1 itself is not swept away from the installation location by the surface water flow. Even in the drainage channel 50 filled with surface water, it is possible to stably maintain an inclined posture in the cross section of the drainage channel 50. As a result, it is possible to stably maintain the performance of the eye plate 1 that obtains the above-described effects regardless of the flow rate of surface water flowing in the drainage channel 50.

  If the eye plate 1 configured in this way is arranged at a location of the drainage channel 50 where the accumulation of foreign matter such as the fall of the grass or fallen leaves is a concern, when the fall of the grass or fallen leaves occurs, FIG. As shown as sediments X0, X1, and X2, they began to accumulate from the deepest part of the eye plate 1 and flowed down the landslide slope surface A. It can flow into the drainage channel 50 from the exposed portion of the eye plate 1 shallower than the top surface of the object X. Then, the surface water flows down into the drainage channel 50 through the slit 2 a at the exposed portion of the eye plate 1 located above the deposit X on the eye plate 1. Accordingly, the surface water can continue to flow into the drainage channel 50 until the upper surface of the eye plate 1 is completely covered by the deposit X that has entered the drainage channel 50. The drainage channel 50 is configured so that the surface water basically flows into the drainage channel 50 from the opening peripheral edge 51A side. For example, it has rained on both sides of the drainage channel 50 or snowed. As in the case, the surface water is considered to flow from the opening peripheral edge 51B side, but even if the surface water flows from any of these opening peripheral edge 51A, 51B side, the sediment X is inclined as described above. Since it can be deposited from the deepest part of the dish 1, surface water can continue to flow into the drainage channel 50 until the upper surface of the eye dish 1 is completely covered with the deposit X.

  On the other hand, even if the upper surface of the eye plate 1 is completely covered with the sediment that has entered the drainage channel 50, a surface water flow cross section is secured in the drainage channel 50, and the flowing water from the upstream area of the drainage channel 50 is allowed to flow down. be able to. That is, the eye plate 1 having the slits 2a as described above prevents foreign matter such as grass and fallen leaves other than surface water from accumulating and closing the drainage channel 50 from entering the drainage channel 50. it can. Therefore, the cross-sectional area in the drainage channel 50 below the eyeplate 1 defined by the eyeplate 1 is maintained as it is, and the channel cross-sectional area can be sufficiently secured for drainage. In other words, it is possible to pass the portion of the drainage channel 50 in which the eye plate 1 is completely covered with deposits, and to flow down the downstream water from the upstream side, and to secure the flow in the drainage channel 50.

  The eye plate 1 is configured to be handled by human power. That is, the eye plate 1 is a member formed in the above-described shape with a predetermined weather resistance and durability using a cheap material such as a rust-proof metal material such as cast iron or a synthetic resin material, and It is configured to have a length and weight as a size that can be easily removed by a person. Therefore, since it comprises in this way and the eye plate 1 can be removed easily, the removal of the deposit from the eye plate 1 or the drainage channel 50 can be performed easily. That is, if the eye plate 1 is removed manually from the drainage channel 50, the removal work of the deposit firmly attached to the eye plate 1 itself can be facilitated. In particular, the drainage channel 50 is installed on a landslide slope and is located on the inclined surface as the installation location of the eye plate 1, so that it is difficult to transport and install the eye plate 1 by a device. In addition, since the installation location is often a location where plants are already prosperous, it is more difficult to carry and install the device. For this reason, the eye plate 1 can be handled manually as described above, and the work of transporting the eye plate 1 to the installation location by human power and the installation operation of the eye plate 1 at the installation location are facilitated. Therefore, the application range as a place where the eye plate 1 can be installed can be expanded.

  In addition, although the interposition part 5 which comprised the eye plate 1 was formed in planar shape as mentioned above, the interposition part 5 bears the 2nd latching part 4 via this interposition part 5. As long as the strength to withstand the load consisting of the weight of the deposits on the main body 2 and the main body 2 can be secured, it is not limited to the planar shape, and a configuration in which the notch is appropriately provided in the interposition part 5, 1 may be provided only at both ends in the longitudinal direction, and in each of these configurations, the weight of the eye plate 1 can be reduced. Can be further improved.

  As described above, according to the clogging prevention plate of the surface water drainage channel of this embodiment, by using the clogging prevention plate for the landslide prevention work, the water collection / The drainage function can be maintained for a long time, and the facility can be easily managed. As this conventional one, a perforated lid-like member that simply covers the upper opening of the drainage channel, or a foreign substance that is arranged at the bottom of the drainage channel and horizontally divides the drainage channel and enters from the outside is eliminated. It is a grid-like member configured to ensure only the flow path space in the drainage channel, these are intended to ensure only the drainage function of the surface water drainage channel, and foreign substances that have entered from the outside of the drainage channel In many cases, the water collection function that causes surface water to flow into the drainage channel due to sedimentation is often lost at an early stage. Below the allowable amount, the water collecting function is not impaired.

  In other words, as part of surface water drainage work that is a landslide prevention work, foreign matter such as tree branches and fallen leaves enter from the outside of the drainage channel, and these foreign matter accumulates and the drainage channel where the drainage channel may be clogged may be drained. If it is connected to one opening periphery of the road, and the cross section of the drainage channel is partitioned obliquely, and a blockage prevention eye plate configured to allow only surface water to pass below the partitioned section is installed, Foreign matter can be accumulated on the upper surface of the blockage-preventing pan and can be held at the upper part in the drainage channel. Therefore, the space below the clogging prevention dish in the drainage channel can be maintained sufficiently stably. For this reason, this space can be made into the drainage space which formed the continuous flow path which goes from upstream to downstream as a drainage channel, and can ensure the drainage function of a drainage channel.

  On the other hand, since the clogging prevention dish is installed in an oblique posture in the cross-sectional area of the drainage channel, foreign substances can be sequentially deposited from the lower part to the upper part of the inclined surface. In other words, foreign substances can be naturally deposited on the inclined eye plate on one side and the lower side of the drainage channel and sequentially upward from the deep part of the drainage channel. For this reason, the portion of the eye plate located above the deposit can be exposed to the outside for a long period of time, and surface water passes through the exposed portion of the eye plate so that the eye plate is partitioned. The drainage space in the formed drainage channel can be reached. That is, in this occlusion prevention plate, the amount of foreign matter accumulated until the upper part of the inclined plate is covered is an allowable amount that secures the water collecting function. For this reason, the drainage channel in which the blockage prevention eye plate is installed can maintain the surface water collecting function for a long period of time as a surface water drainage channel. As a result, the maintenance work for the surface water drainage facility can be reduced, and the management of the facility is simplified.

  In particular, in a configuration in which the upper opening of the drainage channel is covered with a perforated lid-like member, foreign matter intrusion into the drainage channel is prevented, and the upper surface of the lid-like member on which the blocked foreign matter accumulates is substantially flat. Therefore, the so-called allowable amount is indefinite, and even if foreign matter is thinly deposited on the upper surface of the lid-like member, there is a high possibility that the hole of the lid-like member is blocked, whereas the allowable amount is small. The eye plate can reliably capture foreign matter by depositing it on the eye plate in the drainage channel up to the allowable amount. Therefore, in the end, even if a perforated lid-like member is installed in the drainage channel, the countermeasure against foreign matter is unstable and insufficient, but if this eye plate is installed, the above-mentioned allowable amount is used as a reference. Can be handled stably and sufficiently.

  In addition, since the anti-blocking eye plate can be installed and removed without changing the configuration of the drainage channel itself, it can be installed in addition to the existing drainage channel, or once installed in a certain place, Depending on the change, it can be easily re-installed at a place where blockage by other plants is a concern. For example, a blockage prevention eye plate may be stored near the drainage channel in winter and the blockage prevention plate may be installed in the drainage channel in seasons other than winter. Therefore, it is possible to rearrange the plant so as to follow the changes in the state of overgrowth of the plants, and it is possible to flexibly cope with the installation location as appropriate. For this reason, the application range of the blockage | prevention eyepiece can be expanded.

  In addition, even if the top surface of the eye plate is once covered with foreign matter, if surface water is generated, depending on the momentum of the surface water flowing into the drainage channel, the existing sediment may be placed on one side of the drainage channel. Therefore, the possibility of recovering the water collecting function or temporarily exerting the water collecting function can be increased. In other words, the upper end of the eye plate is hooked to the opening periphery of the drainage channel facing the higher side of the landslide slope, that is, the drainage channel opening periphery on the side where surface water flowing through the landslide slope flows. As the main body of the pan is oriented obliquely downward without changing the angle abruptly, such as at right angles, the surface water flows down the landslide slope. No need to diminish momentum. Therefore, foreign objects such as existing grass and fallen leaves that were on the eye plate before the surface water is generated can be pushed away from the upper end. As a result, there is a high possibility that the vicinity of the upper end side of the eye plate will be in an open state without clogging the slit with deposits, so that a minimum water collecting function can be expected.

  In the above embodiment, the eye plate is formed with a single slit in the shape of a long hole that is linearly continuous from the upper end to the lower end in the width direction of the main plate body, and a large number of these are arranged in parallel. Although an example has been described, the present invention is not limited to this, and it may be intermittent, may have a large number of round holes, and may be a frame-shaped member that is formed by appropriately combining long bar-shaped members. After all, according to the vegetation situation of the installation place as a foreign matter that penetrates and accumulates in the drainage channel, if it is a configuration of the main body that prevents the passage of this foreign matter and allows only surface water to pass through, Any configuration may be adopted.

  In addition, although the example in which the main body is inclined and disposed so that the lower end of the main body is in contact with the side wall of approximately half the depth of the drainage channel has been described, the present invention is not limited to this. You may change suitably the inclination attitude | position of a plate | board main body according to the vegetation situation of an installation place, or the cross-sectional area shape of drainage itself. For example, when the depth of the concave portion of the drainage channel is shallower than the above example, the angle of the tilt posture set in the eye plate main body is moderated, or the tilt angle of the above example is kept, The lower end of the main plate body may be positioned near the bottom of the shallow drainage channel.

  Furthermore, although the example which installed the single plate was demonstrated, it is not restricted to this, You may connect and install a several plate so that the predetermined range of a drainage channel may be covered continuously. That is, the longitudinal ends of each eye plate to be joined are joined with separate coupling fittings or joints integrally provided at the ends, and a plurality of eye plates are connected in series in the longitudinal direction. May be integrated into a drainage channel as a long plate. Therefore, in this case, in addition to securing the position where one eye plate is installed by its own weight, in addition to each of its own weights, other eye plates connected to each eye plate alone, Since the positions are constrained to each other, the initial state in which the eye plate is installed can be held sufficiently stably. In particular, if the size and weight of each eye plate are handled manually, if the eye plates are connected to each other in this way and installed in a drainage channel, the mischievous purpose, etc., unless this connection is released It is possible to prevent the installation position from being changed or removed illegally. That is, it is possible to prevent unauthorized rearrangement and exclusion by humans, and to protect the installed state.

The obstruction prevention eye plate of the surface water drainage channel of embodiment of this invention is shown, (a) is a schematic perspective view which shows the state which has arrange | positioned the obstruction prevention eye plate in the surface water drainage channel installed in the inclined surface of a natural ground (B) is the same schematic perspective view which shows the state which removed the blockade prevention eye plate from the drainage channel. The blockage prevention eye plate of this embodiment is shown, (a) is the schematic cross-sectional view, (b) is a schematic cross-sectional view which shows the process in which a foreign material accumulates on the eye plate. It is a schematic perspective view which shows the whole structure which has arrange | positioned the surface water drainage channel in the inclined surface of a natural ground.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blocking prevention plate 2 Plate body 2a Slit (through-hole) 3 1st latching part 4 2nd latching part 5 Interposition part 50 Surface water drainage channel 51 U-shaped pipe 51a Side wall surface of surface water inflow side 51b Side wall surface 51c facing the surface water inflow side Bottom surface 51A One opening peripheral edge 51B on the surface water inflow side Other opening peripheral edge A Landslide slope X, X0, X1, X2 Deposits of foreign matter

Claims (3)

In a drainage channel with an opening above the surface that collects surface water that is installed on the landslide slope and flows down the surface of the landslide slope and drains it from the landslide slope,
The drainage channel is provided with an eyepiece main body which is obliquely partitioned with the transverse cross section of the drainage channel being up and down and one opening peripheral edge of the drainage channel as an upper end. A surface plate for preventing clogging of a surface water drainage channel, having a through hole for allowing only surface water to pass into a lower drainage channel.   The eye plate main body has a first latching portion that is latched on the one opening margin and a second latching portion that is latched on the other opening margin among the opening margins of the drainage channel facing each other. The ground surface according to claim 1, further comprising a latching portion, wherein the through hole is formed intermittently or continuously from the vicinity of the first latching edge portion downward. Anti-blocking eye plate for water drainage channel.   The surface plate of the surface water drainage channel according to claim 1 or 2, wherein the main plate body has a size and a weight that can be handled manually.

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