JP3622182B1 - U-shaped groove with mesh - 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 Offer.
A mesh portion 2 extending outward from the upper portions of left and right side walls 4 of a U-shaped groove body 3 is formed along the longitudinal direction of the body, and the mesh portion 2 includes a plurality of frame portions 8 ', 8'. The U-shaped groove 1 is characterized in that it has a network structure 9 that is formed in a continuous manner in four directions and can weaken the momentum of the water flowing therethrough.
[Selection] Figure 1

Description

  In the U-shaped groove used in general civil engineering, agricultural and industrial waterways and drainage channels, it is possible to prevent the surrounding soil from being eroded by the momentum of water after being embedded in an inclined surface. It is related with the U-shaped groove improved so as to obtain.

  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 a U-shaped groove, in particular, a synthetic resin U-shaped groove, for example, a U-shaped receiving member for a reinforcing material (a bridging material) formed in a longitudinal direction at an upper end portion of a side wall described in Japanese Patent Application Laid-Open No. 2000-129768. A groove member is mentioned.

Japanese Unexamined Patent Publication No. 2000-129768

The problem with the U-shaped groove after installation is soil erosion due to rainwater and spring water. The erosion of the soil by water progresses over time 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 becomes unstable. . 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. 4 (a) and 4 (b).
Fig.4 (a) shows the top view of the conventional U-shaped groove | channel 19 embed | buried under the soil of a flat ground. Rainwater and spring water (water W3) that has oozed out from the upstream side U flows toward the downstream side D outside the U-shaped groove 19. Then, since there is hardly anything that relieves the momentum of the water W3 outside the U-shaped groove 19, the water W3 flows while maintaining the momentum or increasing the momentum. As a result, as shown in FIG. 4B, which is a cross-sectional view taken along the line XX of FIG. 4A, the soil around the U-shaped groove 19 is removed over time by the erosion action caused by the momentum of the water W3. (S1 portion in FIG. 4B). Thus, in the portion of the soil (s1 portion) that has been eroded by being scraped by the water W3, for example, it becomes a path for the water W3 newly generated during the subsequent rain, and the erosion further spreads (s2 portion). .
Thus, in the conventional U-shaped groove as described in the above publication, erosion of surrounding soil after embedding due to the momentum of water cannot be effectively suppressed, and erosion is inevitable. 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 erosion action of the soil by water, the seeds or even the buds of the plant sown in the soil surrounding the U-shaped groove are also washed away. It is possible to become part of. 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 problems, the inventor has formed a U-shaped groove formed by extending outward from the upper portions of the left and right side walls of the U-shaped groove body, and the like having a mesh structure with a continuous polygonal frame. To find out that even when buried not only on flat ground but also on slopes, it can reduce the momentum of the water flowing near the outside, thereby effectively suppressing the water erosion of the soil around the U-shaped groove. It came.
That is, the present invention is a U- shaped groove in which the bottom wall and the left and right side walls of the U-shaped groove main body are formed of hard synthetic resin or fiber reinforced resin , and the net-like portion extending outward from the upper part of the left and right side walls. Is formed along the longitudinal direction of the main body, and the mesh portion is formed by connecting a large number of frame portions in four directions, and has a mesh structure that can weaken the momentum of the water flowing therethrough, preferably further, The present invention relates to a U-shaped groove characterized by having a mesh structure capable of guiding water flowing therethrough to the inside of the U-shaped groove main body.
Further, according to the present invention, the mesh portion is formed integrally with the U-shaped groove body, or is formed separately and is easily attached to the upper portions of the left and right side walls using, for example, rivets. It concerns on the U-shaped groove characterized by this.

The mesh portion formed in the U-shaped groove of the present invention is formed by connecting a large number of frame portions in four directions and has a mesh structure that can weaken the momentum of the water flowing therethrough. Therefore, after the U-shaped groove having the mesh portion is buried, the water flowing through the surface layer of the soil, such as spring water or rain water, or the water scattered from the inside to the outside of the U-shaped groove main body is the mesh portion. By hitting a large number of frame portions constituting the water, the momentum of the water flow is weakened, and 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.
Further, the U-groove mesh portion of the present invention may preferably have a mesh structure that not only weakens the momentum of the water flowing therethrough but also guides the weakened water to the inside of the U-groove 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.
Further, the U-groove net-like portion of the present invention may be formed integrally with the U-shaped groove main body in advance, or may be formed separately from the U-shaped groove main body, and the left and right side walls of the U-shaped groove main body. It can also be set as the aspect attached to the upper part. Therefore, there is an effect that the two usages can be properly used depending on the situation of the buried portion.
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 has a large number of frame portions constituting the mesh structure of the net-like portion of 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 main body. The principle of buffering and weakening the momentum is utilized. First, the structure of the U-shaped groove according to the present invention in which such a mesh portion is formed will be described.

In the present invention, the mesh portion of the U-shaped groove has a mesh structure. In this network structure, a large number of frame portions are connected in four directions, so that when water flows, it flows while hitting the individual frame portions, and therefore the effect of gradually reducing the momentum of the water. Have The frame part also has a height (thickness) that matches the environmental conditions of the buried area, such as the amount of flowing water and the inclination angle at which the U-shaped groove of the present invention is buried, so that the above-mentioned effects are maintained. Is set as appropriate. For example, in the case where it is buried in an area where there is a lot of precipitation or where the inclination angle is large, the height (thickness) of the frame part is more resistant to water when water collides. Or it is desirable to set it higher (thick) so as to exert a resistance to stronger water.
The net-like portion may be formed from any of the upper portions of the left and right side walls of the U-shaped groove body, but when embedded, the U-shaped groove and the surface layer of the surrounding soil are substantially flush with each other. Therefore, it is preferable in terms of structure to be formed from the upper ends of the left and right side walls. The shape of the net-like portion is not particularly limited, but in the case of being integrally formed with the U-shaped groove main body, it is formed from the viewpoint of ease of forming, that is, productivity, and separate from the U-shaped groove main body. In this case, the whole is preferably a flat plate from the viewpoint of easy attachment, that is, workability.
The width of the mesh portion, that is, the length until the mesh portion continues outward from the side wall of the U-shaped groove is appropriately set according to the situation of the region where the U-shaped groove is embedded. 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 width of the mesh portion long.
The width of the mesh portion is preferably 1/4 or more, more preferably 1/2 or more times the width of the bottom wall of the U-shaped groove.
In addition, the mesh portion is formed integrally with the U-shaped groove, and is formed separately from the U-shaped groove, and a hole for passing a rivet is formed in advance at the upper part of the side wall of the U-shaped groove, particularly at the upper end of the side wall. In addition, it is possible to adopt a technique in which a mesh portion is attached to the hole using a rivet or the like. When the net-like part is formed separately from the U-shaped groove main body, examples of the material constituting the net-like part include various synthetic resins, for example, synthetic resins and metals similar to the U-shaped groove to be attached. It is preferably made of synthetic resin in that it does not corrode, is lightweight and has good transport efficiency.

  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.

Next, with respect to the principle that the momentum of water flowing down the surface layer of the soil around the U-shaped groove of the present invention is weakened, the U-shaped groove 1 of the present invention shown in FIGS. 1, 2 (a) and (b) will be cited. explain. The U-shaped groove 1 is configured by attaching a mesh portion 2 to a flat flange portion 6 formed on the upper ends 5 of the left and right side walls 4 of the U-shaped groove main body 3 using a rivet 7. Yes. The mesh portion 2 used has a mesh structure 9 formed by alternately connecting square frame portions 8 ′ and hexagonal frame portions 8 ″ extending in the longitudinal direction alternately in the width direction. Of the sides of the frames constituting these frame portions 8 ′ and 8 ″, the height of the sides of the frames that are substantially perpendicular to the longitudinal direction of the U-shaped groove 1 is slightly higher than the heights of the sides of the other frames. It is formed to become.
When the U-shaped groove 1 of the present invention is embedded, as shown in FIG. 2A, which is a plan view of the U-shaped groove 1, the water W <b> 1 moves downstream from the upstream U on the soil surface around the U-shaped groove 1. Suppose that it has flowed down toward the side D (in the direction of the arrow in the figure). Next, the water W1 comes into contact with the mesh portion 2. Then, due to the structure with different heights of the sides of the frame portion 8, the water W <b> 1 is reticulated as shown in FIG. It collides with the inner surface of many frame portions 8 formed in the portion 2 one after another and receives resistance. Therefore, the momentum of the water W1 is gradually weakened, and as a result, the momentum of the flowing water W1 that can erode and scrape the soil around the U-shaped groove 1 is greatly suppressed.

Subsequently, with respect to the mesh structure that the U-groove mesh portion of the present invention has, which weakens the momentum of the water flowing through the mesh portion and can be further led to the inside of the U-groove body, FIG. The U-shaped groove 10 shown in FIG. The U-shaped groove 10 has the same structure as that of the U-shaped groove 1 described above except for the mesh portion 11. The mesh portion 11 used has a mesh structure 13 in which rectangular frame portions 12 ′ and hexagonal frame portions 12 ″ extending in the longitudinal direction are alternately arranged in the width direction, and are rectangular. All of the frame portions 12 'are connected obliquely so that the longitudinal direction of the frame portions 12' is closer to the inside of the U-shaped groove 10 than the upstream side U. Then, the rectangular frame portions 12 'are arranged. Of the sides, the sides of the longitudinal frame are configured to be slightly higher than the sides of the other frames.
In the case where the U-shaped groove 10 of the present invention is embedded, it is assumed that the water W2 flows down from the upstream U toward the downstream D (in the direction of the arrow in the figure) outside the U-shaped groove 10. However, when the water W2 comes into contact with the mesh portion 11, as shown in FIG. 3B, which is an enlarged view of a portion B of the mesh portion 11 shown in FIG. The water W2 is absorbed by the rectangular frame portion 12 'by the structure with different heights of the sides of the rectangular frame portion 12'. It is effectively guided along the longitudinal direction, ie towards the inside of the U-shaped groove 10.
In this way, the water W2 is greatly scraped away from the momentum that can erode the soil outside the U-shaped groove 10, and is guided to the inside of the U-shaped groove 10 to be effectively drained.

  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 1 of the present invention shown in FIGS. 1 and 2 (a) and 2 (b) was used. Both the mesh portion 2 and the U-shaped groove body 3 are made of polyethylene, and as described above, the mesh-shaped portion 2 is attached to the flange portion 6 of the U-shaped groove body 3 by the rivets 7. The U-shaped groove body 3 is formed into a corrugated structure in which concave strips 15 and convex strips 16 extending from the bottom wall 14 to the upper portions of the left and right side walls 4 are alternately formed in the longitudinal direction. A structure having a bulging portion 17 for preventing the U-shaped groove 1 from floating and a rib portion 18 for reinforcing the upper portion of the side wall 4 was prepared.
The dimensions of the mesh portion 2 and the U-shaped groove body 3 are shown below.

Dimensions of mesh part 2 Width L1: 350 mm, length in the longitudinal direction: 1200 mm
Dimensions of U-shaped groove body 3 Width of bottom wall 14: 600 mm
Height to the upper end 5 of the side wall 4: 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 1 of the present invention are formed on the slope (inclination angle of about 10 °) of the mountain so that the longitudinal direction is from the peak to the foot. Connected and buried. Next, while continuously flowing the water W1 shown in FIG. 2 (a) from the summit of the artificial mountain toward the reed toward the reed 2 at a rate of about 10 liters / minute, the U-shaped groove The soil around 1 was observed. As a result, when the water W1 reaches the square frame portion 8 ′ and the hexagonal frame portion 8 ″ constituting the mesh portion 2, it is observed that the momentum is weakened, and even after 24 hours from the start of water flow In the soil in the vicinity of the net 2 of the U-shaped groove 1 and in the lower soil, no noticeable erosion due to the water W1 was observed.

(Example 2)
In this embodiment, the U-shaped groove 10 shown in FIGS. 3A and 3B is used. The structure of the U-shaped groove 10 is the same as that of the U-shaped groove 1 in the first embodiment except for the mesh portion 11.
The dimension of the mesh part 11 is shown below.

Dimension of reticulated portion 11 Width L2: 350 mm, length in longitudinal direction: 1200 mm

Next, after constructing an artificial mountain and embedding the U-shaped groove 10 in the same manner as in Example 1, from the summit of the artificial mountain in the direction of the ridge toward the net 11, it is approximately 10 liters / minute. The water W2 shown in FIG. 3 (a) was continuously flowed in quantity, and the soil around the U-shaped groove 10 was observed. As a result, when the water W2 reaches the mesh portion 11, its momentum is weakened by the hexagonal frame portion 12 ″, and the inner side of the U-shaped groove 10 along the longitudinal direction of the rectangular frame portion 12 ′. In addition, even after 24 hours from the start of water flow, the soil near the net 11 of the U-shaped groove 10 and the soil below it were not noticeably eroded by water W3. I couldn't see it.

It is a perspective view of the U-shaped groove | channel 1 of this invention. (A) is a top view of the U-shaped groove | channel 1 of this invention, (b) is an enlarged view of A part of the net-like parts 2 shown by (a). (A) is a top view of the U-shaped groove | channel 10 of this invention, (b) is an enlarged view of B part of the net-like parts 11 shown by (a). (A) is a top view of the conventional U-shaped groove | channel, (b) is sectional drawing in the XX line of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 U-shaped groove | channel of this invention 2, 11 Net-like part 3 U-shaped groove main body 4 Side wall
5 Upper end 6 Flange part 7 Rivet 8 ', 8 ", 12', 12" Frame part 9, 13 Mesh structure 14 Bottom wall 15 Concave part 16 Convex part 17 Protruding part 18 Rib part 19 Conventional U-shaped groove

Claims (4)

The bottom wall and the left and right side walls of the U-shaped groove main body are U-shaped grooves formed of a hard synthetic resin or a fiber reinforced resin , and a net-like portion extending outward from the upper part of the left and right side walls is a longitudinal direction of the main body. A U-shaped groove characterized in that the mesh portion is formed by connecting a large number of frame portions in four directions and has a mesh structure that can weaken the momentum of the water flowing therethrough. The U-shaped groove according to claim 1, wherein the net-like portion further has a mesh structure capable of guiding water flowing therethrough to the inside of the U-shaped groove main body. The U-shaped groove according to claim 1, wherein the mesh portion is formed integrally with the U-shaped groove main body. 2. The U-shaped groove according to claim 1, wherein the mesh portion is formed separately from the U-shaped groove main body and is attached to upper portions of left and right side walls.

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