JP3796691B2 - U-shaped groove - Google Patents

Description

  The present invention relates to a U-shaped groove that can be used for agricultural and industrial waterways and drainage channels, and general civil engineering waterways and drainage channels.

  Conventional U-groove made of concrete has been used as a civil engineering development site in Yamano and as a gutter drainage channel for general roads. In recent years, U-groove made of synthetic resin is used instead of U-groove made of concrete. Has reached. This U-groove made of synthetic resin is lighter than conventional U-groove made of concrete, so it is easy to handle in terms of transportation and construction, but generally has rigidity compared to that made of concrete. Since it is low, particularly when a large earth pressure is applied from the outside of the side wall, there is a problem that the side wall is folded inward and easily deforms. Therefore, conventionally, in the upper part of the U-shaped groove, which is the weakest part of the U-shaped groove, a reinforcing material that bridges both side walls of the U-shaped groove is attached at an appropriate location in the width direction, and the side wall portion extends from the bottom wall portion of the U-shaped groove. Has been devised to improve the rigidity against earth pressure on the side wall portion of the synthetic resin U-shaped groove by forming a corrugated shape into a corrugated or similar uneven shape.

Such an improved technique is disclosed in, for example, Japanese Patent No. 3065562. In the publication, a bottom wall and both side walls are formed integrally and provided in a U-shaped cross section so as to form a fluid passage, and the bottom wall is formed to improve rigidity. In the U-shaped groove formed in a corrugated shape, the upper and lower ends of the both side wall portions are formed in a U-shaped groove so that a large number of concave and convex portions extending in a direction perpendicular to the longitudinal direction are formed on both side wall portions. And a U-shaped groove characterized by comprising a partition wall portion formed integrally with the side wall portion at each upper end of the both side wall portions and filling the concave line.
Japanese Patent No. 3065562

However, in the U-shaped groove disclosed in Japanese Patent No. 3065562, each partition wall is an element that individually fills a groove. That is, the partition walls exist independently of each other, and are not joined to each other to form a continuous wall. Therefore, it is difficult to say that the improvement of the rigidity surface is sufficient for the upper part of the side wall portion of the U-shaped groove, especially when torsional stress or local stress is applied to the side wall portion from the side soil. There is a risk that the side wall is distorted or deformed.
Therefore, it has been an object to provide a U-shaped groove having higher rigidity that can sufficiently withstand the earth pressure from the side of the left and right side wall portions of the U-shaped groove, particularly the upper portion.

The present invention has been made in order to solve the above-mentioned problems, and a hard synthetic resin or a fiber reinforced resin formed into a corrugated shape by alternately forming concave and convex portions in the longitudinal direction of the groove. In the U-shaped groove, the concave stripe portion and the convex stripe portion are formed substantially continuously from the bottom wall portion of the U-shaped groove to the upper ends of the left and right side wall portions, and at the upper ends of the left and right side wall portions, A reinforcing wall that closes the concave stripe and extends further outward than the top of the convex stripe is continuously formed in the longitudinal direction of the groove, and further, the reinforcing wall extends on the upper surface in the longitudinal direction of the groove. The present invention relates to a U-shaped groove characterized by forming a protrusion . In a preferred aspect of the present invention, in the U-shaped groove, the width of the reinforcing wall is longer than the interval between the bottom of the concave strip portion and the top of the convex strip portion, and has a length up to five times the interval. Have. Another further preferable aspect of the present invention is a U-shaped groove characterized in that the left and right side wall portions are provided with bulged portions protruding outward.

  In the U-shaped groove of the present invention, at the upper end of the side wall portion, a reinforcing wall that closes the concave portion and extends further outward than the top of the convex portion is continuously formed in the longitudinal direction of the groove, more preferably A ridge extending in the longitudinal direction of the groove is formed on the upper surface of the reinforcing wall. Therefore, in particular, compared with the U-shaped groove disclosed in Japanese Patent No. 3065562, the U-shaped groove of the present invention is remarkably improved in rigidity particularly in the vicinity of the upper end of the side wall portion. This produces an effect that distortion and deformation are hardly caused with respect to various stresses (torsional stress, local stress, etc.) applied by.

The U-shaped groove made of a hard synthetic resin or a fiber reinforced resin in the present invention is formed into a waveform by continuously forming concave and convex portions alternately in the longitudinal direction of the groove in order to improve rigidity. The concave stripe portion and the convex stripe portion are formed substantially continuously from the bottom wall portion of the U-shaped groove to the upper ends of the left and right side wall portions. In addition, the said recessed stripe part and a protruding item | line part may be partially discontinuously or intermittently formed besides the case where it forms continuously to the upper end of the left-right side wall part from the bottom wall part of a U-shaped groove | channel. Good. At the upper ends of the left and right side wall portions of the U-shaped groove, a reinforcing wall is formed continuously in the longitudinal direction of the U-shaped groove so as to close the concave portion and extend further outward than the top of the convex portion. The ridges are completely closed by this reinforcing wall, and these parts are joined together to form a continuous wall in the longitudinal direction, so that the ridges are individually closed. In comparison, the upper portions of the left and right side wall portions of the U-shaped groove are less susceptible to torsional deformation and local deformation, and are less likely to be bent by earth pressure from the side. The width of the reinforcing wall is preferably longer than the interval between the bottom of the concave strip and the top of the convex strip, and has a length of up to five times the interval. If it is shorter than the distance between the bottom of the groove and the top of the protrusion, the groove cannot be completely closed and a continuous wall cannot be formed, and the intended rigidity improvement effect cannot be achieved. If the interval is 5 times or more, the rigidity hardly increases and the production cost increases, which is not preferable. The reinforcing wall in the present invention can also be formed in a U-shaped groove formed by drawing the concave strip portion and the convex strip portion inwardly on the left and right side wall portions. In this case, the upper portions of the left and right side wall portions of the U-shaped groove have a shape that is squeezed from the outside to the inside as a whole. At the same time as the rigidity against earth pressure is increased, the lower portion of the side wall portion is more outwardly spread than the upper portion of the side wall portion. In addition, since the ridges extend in the longitudinal direction of the U-shaped groove on the upper surface of the reinforcing wall, the rigidity of the upper portions of the left and right side walls is further improved, which is a very preferable aspect. . The protruding portion may be formed such that the reinforcing wall stands vertically upward from the outer edge of the protruding wall, or may be a simple protruding shape. Moreover, there is no restriction | limiting in particular in the height from the reinforcement wall.
In the U-shaped groove of the present invention, a reinforcing material capable of improving the rigidity of the U-shaped groove can be attached along the longitudinal direction, and can be horizontally mounted and fixed between the upper portions of the left and right side wall portions. A bridging material can also be attached, and examples of these include bridging materials having a substantially L-shaped, substantially T-shaped or substantially cross-shaped cross section. These bridging materials can be fixed to the U-shaped groove by fitting both ends thereof to the left and right side wall portions of the U-shaped groove. For example, when attaching a bridging material having a substantially L-shaped cross section, a substantially L-shaped bridging material receiving portion corresponding to the shape of both ends of the bridging material is formed in advance on the left and right side wall portions of the U-shaped groove. In addition, the bridging material can be easily fixed to the U-shaped groove by fitting both ends of the bridging material into the receiving portions at the time of construction. Further, as another method for fixing the bridging material to the U-shaped groove of the present invention, there is an embodiment in which the bridging material is attached by rivets on the left and right reinforcing walls of the U-shaped groove. In this case, both ends of each bridging member must be provided with holes for passing rivets and cut out so as to be assembled between the left and right side wall portions of the U-shaped groove. By attaching these bridging materials to the U-shaped groove, it is possible to obtain a favorable effect such as further imparting rigidity to the upper portions of the left and right side wall portions of the U-shaped groove.
Furthermore, the U-shaped groove of the present invention can be provided with bulging portions protruding outward on the left and right side wall portions. As a result, not only can rigidity be added to the U-shaped groove, but also the U-shaped groove can be fixed more effectively because sediment is deposited on the bulging portion when the U-shaped groove is buried. And it helps to prevent the U-shaped groove from rising due to the rise of the groundwater level.
The material of the U-shaped groove of the present invention is preferably a hard synthetic resin such as polyethylene resin, polyvinyl chloride, polypropylene, polyethylene terephthalate, polyamide, and polyphenylene sulfide, and fiber reinforced resin such as FRP and FRTP. As the shape of the U-shaped groove main body, in addition to the original U-shape, a shape rising vertically from the bottom of the wall or a shape rising slightly outward toward the top may be taken. The U-shaped groove of the present invention can be formed by blow molding, rotational molding or the like.

  The present invention will be described in more detail with reference to the drawings. The following examples are not intended to limit the invention.

Example 1.
One embodiment of the U-shaped groove of the present invention is shown in FIG. FIG. 1 is a perspective view showing a U-shaped groove 1 of this embodiment, and FIG. 2 is a plan view of the U-shaped groove 1. The U-shaped groove 1 is formed into a corrugated shape by alternately forming concave and convex portions 4 and convex portions 5 extending from the bottom wall portion 2 to the upper portions of the left and right side wall portions 3 in the longitudinal direction of the groove. The concave strip 4 and the convex strip 5 are continuously formed from the bottom wall 2 of the U-shaped groove to the upper ends 22 of the left and right side walls 3. Here, the concave stripe portion 4 and the convex stripe portion 5 may have an intermittent shape such as a staggered shape. Further, at the upper ends 22 of the left and right side wall portions 3, the reinforcing wall 6 extends inward to the bottom 23 of the concave stripe portion 4 to block the concave stripe portion 4, and further than the flange 24 of the convex stripe portion 5. The wall extends outward and is continuously formed in the longitudinal direction of the U-shaped groove 1. In the present embodiment, the width of the reinforcing wall 6 is formed to be twice the distance between the bottom 23 of the concave strip 4 and the flange 24 of the convex strip 5. The outer edge of the upper surface of the reinforcing wall 6 has a shape in which the ridges 7 are continuously formed in the longitudinal direction of the U-shaped groove 1. Due to the presence of these reinforcing walls 6, further rigidity is improved particularly in the upper portions of the left and right side wall parts 3, and further, the rigidity of the reinforcing wall 6 itself is improved by the formation of the protrusions 7. Increases resistance to earth pressure. In the present embodiment, as described above, the ridge portion 7 rises from the outer edge of the reinforcing wall 6 and is continuously formed in the longitudinal direction of the U-shaped groove 1. It may take a structure in which it rises from substantially the center of the upper surface and is continuously formed in the longitudinal direction of the U-shaped groove 1 or rises from the inner edge of the reinforcing wall 6 and is continuously formed in the longitudinal direction of the U-shaped groove 1. You may take the structure which is made. In the present embodiment, the U-shaped groove 1 has a structure in which the left and right side wall portions 3 spread outward with respect to the bottom wall portion 2. For this reason, the earth pressure which acts on the side wall part 3 is disperse | distributed, and the deformation | transformation of the side wall part 3 is prevented. Of course, the U-shaped groove may have a structure in which the left and right side wall portions stand upright with respect to the bottom wall portion.

It is a perspective view which shows the U-shaped groove | channel of the Example of this invention. It is a top view which shows the U-shaped groove | channel of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 U-shaped groove 2 Bottom wall part 3 Side wall part 4 Convex part 5 Convex part 6 Reinforcement wall 7 Projection part 22 The upper end of a side wall part 23 The bottom of a concavity part 24 The top of a convex part

Claims (3)

In the U-shaped groove formed of a hard synthetic resin or a fiber reinforced resin, and continuously formed in the longitudinal direction of the groove and the ridges and ridges,
The concave strip and the convex strip are formed substantially continuously from the bottom wall portion of the U-shaped groove to the upper ends of the left and right side wall portions,
Reinforcing walls are formed continuously in the longitudinal direction of the groove, covering the concave portions at the upper ends of the left and right side wall portions and extending further outward than the ridges of the convex portions,
The U-shaped groove characterized in that the reinforcing wall is formed with a protrusion extending in the longitudinal direction of the groove on the upper surface thereof . 2. The U-shape according to claim 1, wherein a width of the reinforcing wall is longer than a distance between a bottom of the concave stripe portion and a top of the convex stripe portion and has a length up to five times the interval. groove. The U-shaped groove according to claim 1, wherein the left and right side wall portions are provided with bulging portions protruding outward.

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