JP3622183B1 - U-shaped groove - Google Patents

Abstract

A U-shaped groove capable of effectively suppressing the erosion caused by the water force of the soil around the U-shaped groove, even when embedded in a flat ground or a slope I will provide a.
A receiving portion is placed on left and right side walls of a U-shaped groove main body, and one or a plurality of bridging portions are placed between the left and right receiving portions. However, the reinforcing frame 3 is a U-shaped groove 6 provided on the U-shaped groove main body, and the reinforcing frame 3 extends from the left and right parts or from the left and right parts to the outside of the U-shaped groove body. It is provided with an erosion prevention portion 5 'that extends and can reduce the momentum of the water flow.
[Selection] Figure 3

Description

  In the U-shaped groove used in general civil engineering, agricultural and industrial waterways and drainage channels, the present invention suppresses the surrounding soil from being eroded by the momentum of water after being buried in flat or sloping soil. It relates to a U-groove improved so that it can be made.

  The U-shaped groove is used as a drainage channel at a civil engineering development site in Yamano in addition to being used as a side channel drainage channel for general roads. Therefore, the installation location is not limited to flat land, but covers slopes such as hills and mountainous slopes. As U-shaped grooves, in particular, synthetic resin U-shaped grooves, for example, U-shaped grooves described in Japanese Patent Application Laid-Open No. 11-1956, in which concave and convex stripes are alternately formed in the longitudinal direction, are formed into a waveform. A pair of fitting members disposed along each of the upper ends of the both side wall portions, and a pair of the facing member members are arranged so as to bridge between the upper ends of the both side wall portions. A U-shaped groove for the purpose of improving the rigidity of the left and right side walls can be mentioned by fixing a reinforcing member composed of a plurality of bridging portions connected to the assigning member.

JP-A-11-1956

The problem with the U-shaped groove after installation is soil erosion due to rainwater and spring water. The erosion by water progresses over time on the soil surface around the installed U-shaped groove, the soil outside the U-shaped groove is gradually scraped to create a hole, and the installation of the U-shaped groove is unstable. Become. In particular, soil erosion is significant when installed on the slopes of hills and mountains.
When a conventional U-shaped groove is embedded in a slope, how the surrounding soil is eroded will be described with reference to FIGS. 13 (a) and 13 (b).
Fig.13 (a) shows the top view of the conventional U-shaped groove | channel 23 embed | buried under the soil of a flat ground. Rainwater and spring water (water W5) that has oozed out on the soil surface at the upstream U flows from the upstream U toward the downstream D on the outside of the U-shaped groove 23. Then, since there is no particular thing that relieves the momentum of the water W5 outside the U-shaped groove 23, the water W5 flows while maintaining the momentum or further increasing the momentum. As a result, as shown in FIG. 13B, which is a cross-sectional view taken along the line XX in FIG. 13A, the soil around the U-shaped groove 23 is removed over time by the erosion action caused by the momentum of the water W5. (S1 portion in FIG. 13B). Thus, in the portion of the soil (s1 portion) that has been eroded by being scraped by the water W5, for example, it becomes a path for the water W5 newly generated during the subsequent rain, and the erosion further spreads (s2 portion). .
As described above, in the conventional U-shaped groove using a reinforcing member composed of a simple member and a horizontal member as described in the above publication, effective erosion of the surrounding soil after embedding due to the force of water is effective. It is in a situation where erosion cannot be avoided. In particular, when a U-shaped groove is installed on a slope in a hilly or mountainous area, a stronger water flows due to the slope outside the U-shaped groove, but this momentum cannot be fully countered. In addition, soil erosion will be more pronounced.
The erosion of the soil around the U-shaped groove causes the U-shaped groove to be exposed, leading to a misalignment or floating of the U-shaped groove, or in the worst case, causing landslides around the U-shaped groove. Furthermore, due to the erosive action of the soil by water, the seeds or even the buds of plants planted or carried by the wind around the soil around the U-shaped groove are also washed away. It may be a barren part where the plant does not take root. Therefore, it is desirable to suppress the erosion of the soil around the U-shaped groove as much as possible.

As a result of earnestly working on the above-mentioned problems, the present inventor provided an erosion prevention portion having a structure that can extend the U-shaped groove reinforcing frame outwardly of the U-shaped groove main body and weaken the momentum of the water flow. The improved U-shaped groove not only improves the rigidity of the left and right side walls, but also reduces the momentum of the water flowing in the vicinity of the outside when buried in flat ground and slopes, thereby The present inventors have found that erosion caused by water in the soil around the ditch can be effectively suppressed and completed the present invention.
That is, the present invention includes a receiving portion that is placed on the left and right side walls of the U-shaped groove body, and one or a plurality of bridging portions that are horizontally mounted between the left and right receiving portions. The U-shaped groove body is provided with a reinforcing frame made of hard synthetic resin or fiber reinforced resin , preferably a reinforcing frame in which the left and right receiving portions and the bridging portion are integrally formed in advance. The reinforcing frame has a structure that extends substantially horizontally from each of the left and right portions or from both the left and right portions to the outside of the U-shaped groove body and can weaken the momentum of the water flow. The present invention relates to a U-shaped groove characterized by further comprising a plurality of erosion prevention portions made of hard synthetic resin or fiber reinforced resin at an appropriate pitch .
Among them, a preferred aspect of the present invention is that the left and right end portions of all or part of the bridging portion are respectively extended outward of the U-shaped groove body, and the left and right erosion prevention portions are connected to the bridging portion. A U-shaped groove characterized in that it is integrally formed, and preferably, the left and right receiving portions and the bridging portion are integrally formed, and the erosion preventing portion, the receiving portion and the bridging portion are integrated. Related.
The present invention relates to the U-shaped groove, characterized in that the erosion preventing portion has an outer shape having a flat plate shape or a shape close thereto.
In the present invention, it is preferable that the erosion preventing portion has a structure in which water dammed to the erosion preventing portion is guided to the inside of the U-shaped groove main body, for example, a surface for damming water is inclined with respect to the longitudinal direction of the U-shaped groove. The present invention relates to the above-mentioned U-shaped groove.
Even if the above-mentioned erosion preventing portion is provided not on the reinforcing frame but on the U-shaped groove main body, the above-described problems can be achieved. Accordingly, another aspect of the present invention, a suitable erosion prevention member made on top of the left and right side walls of the U-shaped groove body made of hard synthetic resin or fiber-reinforced resin from a hard synthetic resin or fiber-reinforced resin in the left-right one or both A plurality of erosion prevention members are attached at a pitch, and the erosion prevention member extends substantially horizontally from the upper part of the left and right side walls to the outside of the U-shaped groove main body and can weaken the force of water flow, for example, a flat plate shape Or it has the structure which has the external shape close | similar to this , and it concerns on the U-shaped groove | channel which may be the aspect attached to the upper part of the left-right side wall of a U-shaped groove main body suitably.
Among them, a more preferable aspect of the present invention is that the erosion preventing member has a structure in which water dammed to the erosion preventing member is guided to the inside of the U-shaped groove body, for example, a surface for damming water is a longitudinal direction of the U-shaped groove. The above-mentioned U-shaped groove formed obliquely with respect to.
The present invention particularly relates to a U-shaped groove formed of hard synthetic resin or fiber reinforced resin among U-shaped grooves made of various materials.

The U-shaped groove of the present invention includes an erosion preventing portion having a structure in which the reinforcing frame extends outward from the U-shaped groove main body and can weaken the force of water flow. Therefore, after the U-shaped groove of the present invention is buried, the water flowing through the surface layer of the soil outside the U-shaped groove, such as rain water, hits mainly the side surface of the erosion prevention unit, and the momentum of the water As a result, the erosion of the surrounding soil can be effectively suppressed. Due to this effect, the soil around the U-shaped groove is stabilized, so that the plant is easily rooted and is also easy to grow. And the plant group which flourished around the U-shaped ditch brings about a synergistic effect of weakening the momentum of the water stream flowing there and thereby suppressing the erosion of the surrounding soil. Furthermore, the reinforcing frame includes a receiving part that is placed on the left and right side walls of the U-shaped groove body, and one or a plurality of bridging parts that are horizontally mounted between the left and right receiving parts. Consists of That is, the bridging portion constituting the reinforcing frame is in a state of supporting the left and right receiving portions between the upper ends of the left and right side walls when the reinforcing frame is placed on the left and right side walls. There is also an effect that local deformation of the side wall due to the influence of earth pressure load acting from the outside of the groove to the inside is prevented. The reinforcing frame is preferably formed by integrally forming the left and right receiving portions and the bridging portion. In this case, it is possible to increase the efficiency of the assembling work of the reinforcing frame.
In addition, in the U-shaped groove of the present invention, from the viewpoint that a conventional molding method can be used in manufacturing, the left and right end portions of all or a part of the bridging portion are directed outward of the U-shaped groove body. Each may be extended, and the left and right erosion prevention portions may be formed integrally with the bridge portion. Further, it is particularly preferable that the left and right receiving portions and the bridge portion integrally formed with the erosion prevention portion are integrally formed. In this case, the operation of attaching the receiving portion and the bridge portion to each other can be omitted. , Work efficiency is further increased.
In addition, if the shape of the erosion prevention part has a flat plate shape or a wing shape that is relatively easy to mold, there is no need for a particularly complicated formwork, such as a receiving part or a bridge part. It is advantageous in production because it can be formed by using a conventional forming method as it is or can be easily formed by a little processing as required.
Furthermore, the U-groove erosion preventing portion of the present invention preferably has a structure in which water blocked by the U-groove is guided to the inside of the U-groove main body. Therefore, the water itself that causes the erosion of the soil around the U-shaped groove can be led from the surrounding soil to the inside of the U-shaped groove body and drained. Particularly preferably, the erosion preventing portion is formed such that the surface for blocking water is formed obliquely with respect to the longitudinal direction of the U-shaped groove. Thereby, when the water flowing outside the U-shaped groove reaches the erosion preventing portion, the water is guided to the inside of the U-shaped groove main body along the direction of the surface for blocking water, and can be drained more effectively.
According to another aspect of the present invention, an erosion prevention member is attached to the upper part of the left and right side walls of the U-shaped groove main body on one or both of the left and right side walls. The present invention relates to a U-shaped groove characterized by having a structure that extends outward from the groove-shaped main body and can weaken the momentum of water flow. In such an embodiment, the erosion preventing member can be formed into a structure having an outer shape such as a flat plate shape or a wing shape that is easy to mold, and is advantageous in terms of production, and appropriately on the left and right side walls of the U-shaped groove body. Can be dressed.
Similarly to the erosion prevention portion, the erosion prevention member preferably has a structure in which water blocked by the erosion prevention portion is guided to the inside of the U-shaped groove main body. Particularly preferably, the erosion preventing member has a surface for damming water formed obliquely with respect to the longitudinal direction of the U-shaped groove. Thereby, when the water flowing outside the U-shaped groove passes through the erosion preventing member, the water is guided to the inside of the U-shaped groove main body along the surface for blocking water, and can be drained more effectively.
In addition, the U-shaped groove of the present invention is formed of a hard synthetic resin or a fiber reinforced resin, so that not only corrosion problems do not occur, but also light weight compared to a concrete U-shaped groove, Therefore, it has the advantage that it is easy to handle and has good transport efficiency.

  The U-shaped groove according to the present invention is an erosion formed in the upper part of the U-shaped groove body by rainwater and spring water flowing down the surface layer of the surrounding soil, or water scattered from the inside to the outside of the U-shaped groove body. The prevention part or the erosion prevention member is caused to collide mainly with the side surface to buffer and weaken the momentum. First, the structure of the U-shaped groove according to the present invention in which an erosion preventing portion or an erosion preventing member is formed will be described.

In the U-shaped groove of the present invention, the erosion prevention portion or the erosion prevention member has a certain thickness so that the water collides and the momentum is effectively reduced, and usually one reinforcing frame. Alternatively, a plurality of U-shaped groove bodies are formed. The size of the surface for blocking water of the erosion prevention portion or the erosion prevention member, the number of erosion prevention portions or erosion prevention members and the pitch at which the erosion prevention portion or erosion prevention member is formed, that is, one erosion prevention portion or erosion prevention The distance between the member and the adjacent erosion prevention part or erosion prevention member is such that the amount of flowing water and the angle of inclination where the U-shaped groove is embedded are maintained so that the effect of weakening the momentum of water is maintained. It is set appropriately according to the environmental conditions. For example, in the case where it is buried in an area where there is a large amount of precipitation or where the inclination angle is large, the surface of the erosion prevention part or the erosion prevention member for damming the water is larger in order to more effectively reduce the momentum of the flowing water, It is desirable to set a larger number or a shorter pitch.
The length of the erosion preventing portion or the erosion preventing member, that is, the length of the erosion preventing portion or the erosion preventing member extending outward from the side wall of the receiving portion or the U-shaped groove main body is also embedded in the U-shaped groove. It is set as appropriate according to local conditions. For example, when buried in an area where precipitation is particularly high, it is predicted that the amount of water flowing outside the U-shaped groove is large. In this case, in order to effectively suppress the momentum of these large amounts of water, it is desirable to set the length of the erosion preventing portion or the erosion preventing member long.
The respective erosion preventing portions provided on the left and right sides of the reinforcing frame do not need to be formed so as to be symmetrical with respect to the longitudinal direction of the U-shaped groove. For example, as shown in FIG. 1, three spans 2 ′, 2 ″, 2 ″ ′ horizontally mounted on the left and right receiving portions 1 ′, 1 ″ are formed into receiving portions 1 ′, 1 ″. In the reinforcing frame 3 that is integrally formed with the bridge portion 2 ', both the left and right end portions 4' are extended to form an erosion prevention portion 5 ', and the bridge portion 2 " Only the end portion 4 ″ is extended to form an erosion prevention portion 5 ″, and only the left end portion 4 ″ ′ is extended to form an erosion prevention portion 5 ″ ′ for the bridging portion 2 ″ ′. An embodiment is mentioned. Further, as shown in FIG. 2, in the bridging portion 2 ′ and the bridging portion 2 ″ ′, erosion preventing portions 5 ′ and 5 ″ ′ are formed on both the left and right end portions 4 ′ and 4 ″ ′, respectively. In the bridging portion 2 ″, it is also conceivable that the erosion preventing portion is not formed on both the left and right end portions 4 ″.
In the case where the receiving portion and the bridging portion are separate bodies, the receiving portion can be placed horizontally on one or more bridging portions, and can be placed on the side wall of the U-shaped groove body. The shape in particular is not ask | required, For example, things, such as flat form, cross-sectional substantially L shape, and cross-sectional substantially T shape, are mentioned. The shape of the bridging portion used is not limited, but, for example, a flat plate shape, a substantially L-shaped cross-section, a substantially T-shaped cross-section, or the like can be used, and an existing square angle material can also be used. . The receiving portion, the bridging portion, and the erosion preventing portion may be integrally formed with each other in an arbitrary combination, or each may be attached separately by rivets or the like. For example, the receiving portion and the bridging portion may be integrally formed and the erosion preventing portion may be a separate body.

After embedding, if the right and left side walls are unlikely to cause local deformation due to the pressure of the surrounding soil, erosion will occur at the upper part of the left and right side walls of the U-shaped groove body without using the reinforcing frame as described above. The U-shaped groove according to another aspect of the present invention having a structure in which the prevention member is attached to each of the left and right sides can also be used.
The erosion prevention member also needs to be formed so as to be symmetric with respect to the longitudinal direction of the U-shaped groove at the upper part of the left and right side walls of the U-shaped groove body, like the above-described erosion prevention part. Absent.
The erosion preventing member is formed with a hole through which a rivet passes in the upper part of the side wall of the U-shaped groove main body, in particular, the upper end of the side wall, and the erosion preventing member can be easily attached to the hole using a rivet or the like.

  There is no restriction | limiting in particular in the shape of the U-shaped groove | channel main body which concerns on this invention, For example, the thing of the corrugated structure etc. with which the side wall and the bottom wall were flat structures, or the uneven | corrugated shape was repeated alternately in the longitudinal direction are mentioned. Examples of the material of the U-shaped groove main body include synthetic resins such as hard synthetic resins such as polyethylene, polyvinyl chloride, polypropylene, polyethylene terephthalate, and polyamide. Glass fibers, carbon fibers, organic fibers, etc. are used for unsaturated polyesters. Of course, a fiber reinforced resin containing bismuth can also be used. The same synthetic resin as described above can also be used for the material of the receiving portion, the bridging portion, the erosion prevention portion, and the erosion prevention member.

Next, the principle that the momentum of the water flowing down the surface layer of the soil around the U-shaped groove of the present invention is weakened will be described with reference to the U-shaped groove 6 of the present invention shown in FIGS.
The U-shaped groove 6 includes a reinforcing frame 3 on a flat flange portion 10 formed at the upper ends 9 of the left and right side walls 8 of the U-shaped groove body 7. In the same manner as the reinforcing frame 3 shown in FIG. 1 described above, the reinforcing frame 3 includes three bridging portions 2 ′, 2 ″, 2 ″ ′ horizontally mounted on the receiving portions 1 ′, 1 ″. It is a structure integrally formed with 1 ′, 1 ″. As shown in FIG. 5, the bridging portions 2 ′, 2 ″ at both the left and right ends of the bridging portions 2 ′, 2 ″, 2 ″ constituting the reinforcing frame 3.
In addition, the flat plate-like erosion prevention portions 5 ', 5 ", 5"' are formed by being integrated with each of 2 "'and further extending outward of the U-shaped groove body 7. The reinforcing frame 3 is attached by being attached by a rivet 11 on the flange portion 10. When the U-shaped groove 6 according to the present invention is embedded, as shown in FIG. It is assumed that the surface layer of the surrounding soil has flowed down from the upstream U toward the downstream D. However, the water W1 gradually approaches the erosion preventing portions 5 ′, 5 ″, 5 ″ ′ by hitting the main surfaces one after another. As a result, the momentum that the flowing water W1 can erode by scraping the soil around the U-shaped groove 6 is greatly suppressed.

  Then, the aspect in which the water dammed by this in the erosion prevention part is guided to the inner side of the U-shaped groove main body will be described with reference to the U-shaped groove 12 shown in FIGS. 6 and 7. The U-shaped groove 12 has the same structure as the U-shaped groove 6 except for the erosion preventing portions 13 ′, 13 ″, and 13 ″ ″ provided in the reinforcing frame 3. As shown in FIG. 8, the erosion preventing portions 13 ′, 13 ″, 13 ″ ′ are integral with the bridging portions 2 ′, 2 ″, 2 ″ ′, respectively, and are flat-plate shaped, but dam the water. A side surface to be stopped is formed in an oblique direction with respect to the longitudinal direction of the U-shaped groove 12. In the case where the U-shaped groove 12 of the present invention is buried, it is assumed that the water W2 flows down from the upstream U toward the downstream D on the soil outside the U-shaped groove 12. However, the water W2 is guided to the inside of the U-shaped groove body 7 along the direction of the side surfaces of the erosion preventing portions 13 ', 13 ", 13"', and as a result, is effectively drained.

Next, the U-shaped groove 14 shown in FIGS. 9 and 10 is a U-shaped groove formed by attaching an erosion preventing member to the left and right sides of the upper part of the left and right side walls of the U-shaped groove main body according to another aspect of the present invention. Will be described.
The U-shaped groove 14 is configured by removing the reinforcing frame 3 from the U-shaped groove 6 shown in FIGS. 3 and 4. On the left and right flange portions 10 of the U-shaped groove body 7, six erosion preventing members 15 are provided. The U-shaped groove body 7 is directly attached with rivets 11 in the longitudinal direction. The U-shaped groove 14 of the present invention in which the erosion preventing member 15 is formed is also from the upstream U to the downstream D, similarly to the erosion preventing portions 5 ′, 5 ″, 5 ″ ′ of the U-shaped groove 6 described above. When the flowing water W3 hits the side surface of the erosion prevention member 15 one after another, the momentum can be weakened.

A more preferable structure of the U-shaped groove of the present invention in which the erosion preventing member is used is a structure in which the water dammed by the erosion preventing member is guided to the inside of the U-shaped groove body, in particular, water is dammed. It has a structure in which the surface is formed obliquely with respect to the longitudinal direction of the U-shaped groove. As one embodiment of the U-shaped groove of the present invention, a U-shaped groove 16 shown in FIGS. 11 and 12 can be cited.
The U-shaped groove 16 has a configuration in which the reinforcing frame 3 is removed from the U-shaped groove 12 shown in FIGS. 6 and 7, and the six erosion preventing members 17 are inclined with respect to the longitudinal direction of the U-shaped groove main body 7. As such, it is directly attached with rivets 11. Similarly to the U-shaped groove 12 described above, the U-shaped groove 16 also causes the water W4 flowing from the upstream side U to the downstream side D to be U-shaped along the side surface of the erosion prevention member 17, that is, the surface that dams up water. It can lead to the inside of the groove body 7 and drain effectively.

  The present invention will be described more specifically with reference to examples. The following examples should not be construed as limiting the invention in any way.

(Example 1)
In this embodiment, the U-shaped groove 6 of the present invention shown in FIGS. 3 and 4 was used. Reinforcing frame 3 having left and right receiving portions 1 ′, 1 ″ and bridging portions 2 ′, 2 ″, 2 ″ ′ having a substantially L-shaped cross section, and erosion preventing portions 5 ′, 5 ″, 5 ″ ′, and The U-shaped groove main body 7 is entirely made of polyethylene, and the U-shaped groove main body 7 has concave strip portions 19 and convex strip portions 20 extending alternately from the bottom wall 18 to the upper portions of the left and right side walls 8 in the longitudinal direction. It is formed and formed into a corrugated structure, and the side wall 8 has a structure in which a bulging portion 21 for preventing the U-shaped groove 6 from floating and a rib portion 22 for reinforcing the upper portion of the side wall 8 are formed. Prepared.
The dimensions of the erosion prevention portions 5 ′, 5 ″, 5 ″ ′ and the U-shaped groove body 7 are shown below.

Erosion prevention part 5 ', 5 ", 5"' dimensions (all common)
Width: 60mm, length: 200mm
Dimensions of U-shaped groove body 7
Bottom wall 18 width: 600 mm
Height to the upper end 9 of the side wall 8: 650 mm
Longitudinal length: 1180mm

Next, an artificial mountain having a height of about 5 m is built using soil, and a plurality of U-shaped grooves 6 of the present invention are formed on the slope of the mountain (inclination angle of about 10 °) so that the longitudinal direction is from the peak to the foot. Connected and buried. Next, the water W1 shown in FIG. 4 is continuously flowed from the top of the artificial mountain toward the ridge toward the erosion prevention portions 5 ′, 5 ″, 5 ″ ′ at approximately 10 liters / minute. The soil around the U-shaped groove 6 was observed. As a result, when the water W1 passes through the erosion prevention portions 5 ′, 5 ″, 5 ″ ′, it is observed that the momentum is weakened, and even after 24 hours from the start of water flow, the erosion prevention portion of the U-shaped groove 6 is observed. No noticeable erosion due to water W1 was observed in the soil in the vicinity of 5 ′, 5 ″, 5 ″ ′ and the lower soil.

(Example 2)
In this example, the U-shaped groove 12 shown in FIGS. 6 and 7 was used. The structure of the U-shaped groove 12 is the same as that of the U-shaped groove 6 in the first embodiment except for the erosion preventing portions 13 ′, 13 ″, 13 ″ ′.
The dimensions of the erosion prevention portions 13 ′, 13 ″, 13 ″ ′ are shown below.

Dimensions of erosion prevention parts 13 ', 13 ", 13"' (all common)
Width: 60mm, length: 200mm

Next, after constructing an artificial mountain in the same manner as in Example 1 and connecting and embedding the U-shaped grooves 12, the erosion preventing portions 13 ', 13 "are moved from the top of the artificial mountain to the ridge. The water W2 shown in FIG. 7 was continuously flowed at 10 liters / minute toward 13 ″ ′, and the soil around the U-shaped groove 12 was observed. As a result, when the water W2 passes through the erosion preventing portions 13 ′, 13 ″, 13 ″ ′, the water W2 is dammed to the side surfaces, and is effectively guided to the inside of the U-shaped groove body 7 along the side surfaces. It was observed that Further, even after 24 hours from the start of water flow, no remarkable erosion due to the water W2 was observed in the soil in the vicinity of the erosion preventing portions 13 ′, 13 ″, 13 ″ ′ of the U-shaped groove 12 and the lower soil.

(Example 3)
In this embodiment, the U-shaped groove 14 of the present invention shown in FIGS. 9 and 10 to which the erosion preventing member 15 is attached is used. The erosion preventing member 15 is made of polyethylene, and the erosion preventing member 15 is attached to the flange portion 10 formed on the upper end 9 of the U-shaped groove main body 7 by a rivet 11. The U-shaped groove body 7 in the present embodiment is the same as that used in the first embodiment.
The dimensions of the erosion prevention member 15 are shown below.

Dimensions of the erosion prevention member 15 Width: 60 mm, Length: 200 mm

Next, after constructing an artificial mountain in the same manner as in Example 1 and connecting and embedding the U-shaped grooves 14, the artificial mountain is directed toward the erosion prevention member 15 from the summit to the ridge. 10 liters /
In minutes, water W3 shown in FIG. 10 was continuously flowed, and the soil around the U-shaped groove 14 was observed. As a result, it was observed that the water W3 was dammed on its side surface when passing through the erosion prevention member 15, and was effectively discharged along the side surface to the inside of the U-shaped groove body 7. In addition, even after 24 hours from the start of water flow, no remarkable erosion due to the water W3 was observed in the soil in the vicinity of the erosion preventing member 15 of the U-shaped groove 14 and in the lower soil.

(Example 4)
In this embodiment, the U-shaped groove 16 shown in FIGS. 11 and 12 is used. The structure of the U-shaped groove 16 is the same as that of the U-shaped groove 14 in the third embodiment except for the erosion preventing member 17.
The dimensions of the erosion prevention member 17 are shown below.

Dimensions of erosion preventing member 17 Width: 60 mm, length: 250 mm

Next, after constructing an artificial mountain in the same manner as in Example 1 and connecting and embedding the U-shaped grooves 16, the artificial mountain is directed toward the erosion prevention member 17 from the summit to the ridge. The water W4 shown in FIG. 12 was continuously flowed at 10 liters / minute, and the soil around the U-shaped groove 16 was observed. As a result, it was observed that the water W4 was dammed to the side surface of the erosion preventing member 17 and was effectively discharged to the inside of the U-shaped groove body 7 along the side surface. In addition, even after 24 hours from the start of water flow, no conspicuous erosion due to the water W4 was observed in the soil in the vicinity of the erosion preventing member 17 of the U-shaped groove 16 and in the lower soil.

5 is a perspective view showing an aspect of an erosion preventing portion formed for a reinforcing frame 3. FIG. FIG. 5 is a perspective view showing another aspect of an erosion prevention portion formed for the reinforcing frame 3. It is a perspective view of the U-shaped groove 6 which is 1 aspect of this invention. It is a top view of the U-shaped groove 6 which is 1 aspect of this invention. It is a perspective view of the reinforcement frame 3 provided with the erosion prevention part 5. FIG. It is a perspective view of the U-shaped groove | channel 12 which is 1 aspect of this invention. It is a top view of the U-shaped groove | channel 12 which is 1 aspect of this invention. It is a perspective view of the reinforcement frame 3 provided with the erosion prevention part 13. FIG. It is a perspective view of the U-shaped groove | channel 14 which is 1 aspect of this invention. It is a top view of the U-shaped groove | channel 14 which is 1 aspect of this invention. It is a perspective view of the U-shaped groove | channel 16 which is 1 aspect of this invention. It is a top view of the U-shaped groove | channel 16 which is 1 aspect of this invention. (A) is a top view of the conventional U-shaped groove 23, (b) is sectional drawing in the XX line of (a).

Explanation of symbols

1 Receiving part 2 ', 2 ", 2"' Crossing part 3 Reinforcement frame 4 ', 4 ", 4"' End part 5 ', 5 ", 5"', 13 ', 13 ", 13"' Prevention of erosion Portions 6, 12, 14, 16 U-shaped groove 7 U-shaped groove main body 8 Side wall 9 Upper end 10 Flange portion 11 Rivet 15, 17 Erosion preventing member 18 Bottom wall 19 Concave portion 20 Convex portion 21 Swelling portion 22 Rib 23 Conventional U-shaped groove

Claims (12)

Rigid synthetic resin comprising a receiving part placed on the left and right side walls of the U-shaped groove body and one or a plurality of bridging parts that are laid horizontally between the left and right receiving parts Or a U-shaped groove provided on the U-shaped groove main body with a reinforcing frame made of fiber-reinforced resin ,
The reinforcing frame is a hard synthetic resin or fiber having a structure that extends substantially horizontally from each of the left and right parts or from both the left and right parts to the outside of the U-shaped groove body and can weaken the force of water flow. A U-shaped groove, further comprising a plurality of erosion prevention portions made of reinforced resin at an appropriate pitch . The left and right end portions of all or part of the bridging portion are respectively extended outward of the U-shaped groove body, and the left and right erosion prevention portions are formed integrally with the bridging portion. The U-shaped groove according to claim 1. The U-shaped groove according to claim 1, wherein the reinforcing frame is formed by integrally forming the left and right receiving portions and the bridging portion. The U-shaped groove according to claim 2, wherein the reinforcing frame is formed by integrally forming the left and right receiving portions and the bridging portion. 5. The U-shaped groove according to claim 1, wherein the erosion preventing portion has an outer shape of a flat plate shape or a shape close thereto. The said erosion prevention part has a structure in which the water dammed up by this is led to the inner side of the said U-shaped groove main body, The any one of Claims 1 thru | or 5 characterized by the above-mentioned. U-shaped groove. The U-groove according to claim 6, wherein the erosion preventing portion has a surface that dams water obliquely with respect to the longitudinal direction of the U-groove. A plurality of erosion prevention members made of hard synthetic resin or fiber reinforced resin are attached to the left and right side walls of the U-shaped groove main body made of hard synthetic resin or fiber reinforced resin at an appropriate pitch on both the left and right sides. The U-groove characterized in that the erosion prevention member has a structure that extends substantially horizontally from the upper part of the left and right side walls to the outside of the U-groove main body and can weaken the momentum of the water flow. 9. The U-shaped groove according to claim 8, wherein the erosion preventing member has an outer shape of a flat plate shape or a shape close thereto, and is attached to upper portions of left and right side walls of the U-shaped groove main body. . The U-groove according to claim 8 or 9, wherein the erosion preventing member has a structure in which water blocked by the erosion preventing member is guided to the inside of the U-groove main body. 11. The U-shaped groove according to claim 10, wherein the erosion preventing member has a surface that dams up water and is formed obliquely with respect to the longitudinal direction of the U-shaped groove. The U-shaped groove according to any one of claims 1 to 7 , wherein the U-shaped groove is formed of a hard synthetic resin or a fiber reinforced resin.

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