JP2002294850A - U-ditch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a U-ditch made of synthetic resin with high rigidity without using a metallic reinforcing material. SOLUTION: This U-ditch 1 formed of rigid synthetic resin or fiber reinforced resin comprises a U-ditch body 2 forming a wall of U-shaped cross section, formed in corrugated shape by alternately forming recessed parts 5, etc., and projecting parts 6, etc., extending from a wall bottom part 3 of the body to the upper parts of right and left wall side parts 4, 4, continuously in the longitudinal direction of the U-ditch; and bridging members 7A horizontally laid between the right and left wall side parts 4, 4. The right and let wall side parts 4, 4 of the body respectively rise vertically or outward from the wall bottom part 3, and the recessed parts 5, etc., are formed deflectively inward at the upper parts. The upper ends of both wall side parts 4, 4 are formed with bridging member receiving parts 8, 8 respectively extending outward and having flat faces, and both end parts of the bridging members 7A are fixed onto the receiving parts 8, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a U-shaped groove made of synthetic resin which can be used for agricultural and industrial waterways and drainage channels, and general civil engineering waterways and drainage channels.

[0002]

2. Description of the Related Art Conventionally, concrete U-shaped grooves have been used as civil engineering development sites in Yamano and as side gutters and drainage channels for general roads. In recent years, U-shaped grooves made of synthetic resin have been used instead of U-shaped grooves made of concrete. U-shaped grooves have been used. This synthetic resin U-shaped groove is lighter than the conventional concrete U-shaped groove, so it is easy to handle on the transportation and construction side, whereas the synthetic resin U-shaped groove is concrete In general, since the rigidity is low, there is a problem that the side wall is bent inward and easily deformed particularly when a large earth pressure is applied from outside the side wall. Therefore, in order to solve this problem, a method of achieving an improvement in rigidity against earth pressure from outside the side wall of the U-shaped groove made of synthetic resin by forming the side wall surface from the bottom wall surface of the U-shaped groove into a corrugated or similar uneven shape. Is known and proposed (Japanese Patent Application Laid-Open No. 61-83731, Japanese Patent Application Laid-Open No. 11-19 / 1999).
No. 56, etc.). In this type of U-shaped groove, designing the above-mentioned uneven shape to be too large in the vicinity of the bottom thereof impedes the flow of rainwater, groundwater, and the like, and sufficiently functions as a flow path that is originally intended for use. Can not be fulfilled. Therefore, a method of keeping the inner wall surface of the U-shaped groove on a flat surface and attaching the unevenness only to the outer wall surface has been studied (for example, Japanese Patent Application Laid-Open No. 8-151677).
However, no significant improvement in rigidity can be expected, and this is not necessarily an advantageous means.

However, in order to increase the rigidity of the U-shaped groove against the earth pressure from the outside of the side wall, there is a natural limit to simply providing the shape of the U-shaped groove with unevenness. Even if the wall thickness is increased, the manufacturing cost is increased. Rises. In addition, the earth pressure that presses and deforms the left and right side walls inward during use of the U-shaped groove acts not only in a direction perpendicular to the side wall but also in a direction oblique to the side wall. Furthermore, the degree of the earth pressure applied to the U-shaped groove tends to be uneven when viewed as a whole of the U-shaped groove, and the torsional stress tends to act on the U-shaped groove.
Therefore, it is necessary to consider that the U-shaped groove has a rigidity that can withstand pressures from various load directions. So conventionally,
In addition to devising the shape of the U-shaped groove, at 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 several places in the width direction, so that the synthetic resin U is formed. There is also known a method of improving rigidity against earth pressure on the side wall of the groove. For example, in Japanese Unexamined Patent Application Publication No. 11-1956, a reinforcing material is provided along the upper ends of both side walls to secure more strength, and a plurality of bridging members made of metal are reinforced with rivets or bolts and nuts. U with a structure that spans between both side walls by fixing
Disclose a groove. Also, JP-A-2000-12976
Japanese Patent Publication No. 8 (1994) -181605 disposes a reinforcing member made of a shaped steel in a longitudinal direction at a receiving portion formed at an upper end portion of an opposing side wall of a U-shaped groove member made of synthetic resin, and uses a bolt and a nut between the receiving portions. 9 shows a U-shaped groove member that is bridged by a fixed horizontal member. Further, this publication and Japanese Patent Application Laid-Open No. 2000-104326
The publication discloses a horizontal member formed so as to straddle the upper end portions of both side walls of the U-shaped groove from above, and the horizontal member has opposite U-shaped ends.
It discloses a fitting that is bent into a letter shape to form a fitting portion that can be fitted, and does not require a stopper for a horizontal member fixed to a U-shaped groove.

[0004]

In the above-mentioned prior art, the reinforcing material that bridges both side walls of the U-shaped groove above the U-shaped groove is:
It is mainly made of metal such as angle steel with a substantially L-shaped cross section.
Screws, bolts, nuts, or other fasteners (fixtures) are used on the upper part of the wall side of the groove, or both ends of the bridging reinforcement have a complicated shape without the need for fixtures. Things. However, using fixing devices such as screws and bolts and nuts as in the related art for bridging the bridging material in the U-shaped groove makes the work of laying the U-shaped groove very complicated. Further, in the case where the both ends of the bridging reinforcing material described in JP-A-2000-129768 and JP-A-2000-104326 have complicated shapes, many points are required to be bent in manufacturing, and , Which is disadvantageous in terms of manufacturing cost. Further, the conventional U
The U-shaped groove is used together with a reinforcing metal auxiliary member extending in the longitudinal direction of the U-shaped groove as a reinforcing member receiving portion of the bridging material (Japanese Patent Application Laid-Open Nos. 11-1956 and 2000-2000).
No. 104326) or a type in which a metal as a reinforcing material is integrally formed and directly embedded in upper portions of both side walls of a U-shaped groove (Japanese Patent Laid-Open No. 2000-129768). This is because it is considered that arranging the metal reinforcing material in a ladder shape in the longitudinal direction and the width direction is effective in remarkably improving the rigidity. However, the necessity of mounting the auxiliary member in the U-shaped groove for the arrangement of the bridging material makes the workability of laying the U-shaped groove worse. In the case of a type in which a reinforcing material is embedded in a U-shaped groove by integral molding, the number of steps is large in manufacturing the U-shaped groove, and the cost is high. Further, since the metal corrodes, the metal bridging material may cause a decrease in strength and a deterioration in appearance due to the corrosion. In addition, since L-shaped angle-type steel materials are often mounted with sharp parts protruding,
The worker may be injured or the clothes of the worker may be caught and broken. Therefore, an object of the present invention is to provide a bridging member that can be easily attached without requiring an auxiliary member for attachment, screws, bolts and nuts, which complicates the work at the time of laying. A synthetic resin U with a bridging material that can secure sufficient strength and high rigidity by bridging a bridging material with a simple shape and low manufacturing cost
To provide a groove. In addition, compared to the case of using a metal member, the strength is not inferior to that obtained when using a metal member. In other words, an object of the present invention is to provide a U-shaped groove capable of performing installation work safely and easily and quickly.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems. As a result, in the U-shaped groove main body formed in a corrugated shape by forming the concave streak portion and the convex streak portion alternately and continuously in the longitudinal direction of the U-shaped groove, the concave streak portion is directed inward at the upper part of the left and right side walls. The rigidity is increased by warping, and the upper ends of both wall side portions each extend outward to form a bridging material receiving portion having a flat surface, and on the receiving portion, other auxiliary members are formed. By using a bridge between the left and right side walls without using a bridge, it is possible to have the same rigidity as a U-shaped groove using a conventional metal bridge. The inventors have invented a U-shaped groove made of a hard synthetic resin or a fiber-reinforced resin having a shape. That is, the present invention is a U-shaped groove main body that forms a wall having a U-shaped cross section, and alternately includes a concave portion and a convex portion that extend from the bottom of the main body to the upper portions of the left and right wall sides, U
A U-shaped groove comprising a U-shaped groove main body formed in a corrugated shape by continuously forming the U-shaped groove in the longitudinal direction, and a bridging member bridging between left and right wall sides of the main body. The left and right wall sides of the main body respectively stand vertically or outwardly from the bottom of the wall, and at the top thereof, concave portions are formed inwardly inward to increase rigidity, and both wall sides are formed. The upper ends of the portions each extend outward to form a bridging material receiving portion having a flat surface, and both ends of the bridging material are fixed on the bridging material receiving portion. The present invention relates to a U-shaped groove made of a hard synthetic resin or a fiber reinforced resin. Preferably, in the present invention, the bridging member is formed of a flat plate or a square angle member having a flat upper surface, and both ends of the bridging member are rivets made of a hard synthetic resin or a fiber reinforced resin. The U-shaped groove is characterized in that the U-shaped groove is attached to the bridging member receiving portion by using a stud. It is also preferable that the U-shaped groove of the present invention is provided with ribs protruding outwardly on the left and right wall side portions of the U-shaped groove main body to increase rigidity and prevent floating. A further preferred aspect of the present invention is characterized by further comprising a reinforcing material made of a hard synthetic resin or a fiber reinforced resin mounted on the bridging material receiving portion along the longitudinal direction of the U-shaped groove. .

The U-shaped groove main body made of a hard synthetic resin or a fiber reinforced resin according to the present invention has a structure in which concave portions and convex portions extending from the bottom of the wall to the upper portions of the right and left side walls are alternately formed. By continuously forming in the direction, it is formed into a corrugated shape to achieve rigidity. At the same time, the left and right wall sides of the U-shaped groove main body rise vertically or outwardly from the bottom of the wall, and the ridge portion near the upper wall side of the U-shaped groove extends to the upper end as it is and extends outward. To form a bridging material receiving portion. However, the concave ridge portion is formed so as to extend inward at the upper portion and then extend outward at the upper end to be connected to the bridging member receiving portion.
Due to the warpage of the concave portion, the shape of the U-shaped groove body of the present invention becomes a shape narrowed inward from the outside at the upper portion on both side walls. Compared with a synthetic resin U-shaped groove arranged only from the bottom surface to the side surface, higher rigidity can be obtained against earth pressure from various load directions, particularly near the upper portions of the left and right wall side portions. In addition, since the upper ends of both wall side portions each extend outward to form a bridging material receiving portion having a flat surface, the bridging material constituting the U-shaped groove of the present invention has both ends thereof. It can be fixed on the bridging material receiving portion as it is, and there is no need to use an auxiliary member for arranging the bridging material on the upper part of both side walls. If a rivet made of the same resin as the U-shaped groove is used for fixing the bridging member, it can be easily fixed without complicated work such as screwing. Therefore, the U-shaped groove of the present invention is formed such that all of its members are formed of a hard synthetic resin or a fiber reinforced resin. With the above-described structure including the bridge member and the bridging member, the rigidity is comparable to that of the conventional synthetic resin U-shaped groove using the metal reinforcing member without using the metal reinforcing member. Furthermore, the U-shaped groove body of the present invention achieves higher rigidity by providing outwardly protruding rib portions on the left and right wall side portions. When the U-shaped groove is buried, sediment accumulates and the load is applied to the part that protrudes outward from the U-shaped groove. Useful. In addition, in the U-shaped groove according to the present invention, along the longitudinal direction of the U-shaped groove, a reinforcement made of a hard synthetic resin or a fiber-reinforced resin is provided on the bridging material receiving portion on both upper sides of the U-shaped groove main body. Materials can also be attached. By this mounting, U
It is also possible to give the groove a higher rigidity.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail with reference to the drawings. The following examples are not intended to limit the invention.

Embodiment 1 One embodiment of a U-shaped groove according to the present invention is shown in FIGS. Figure 1
FIG. 2 is a diagram illustrating the U-shaped groove 1 of the present embodiment, FIG. 2 is a plan view of the U-shaped groove 1 of the present embodiment, and FIG. 3 is a side view thereof. The U-shaped groove 1 has a width of, for example, 180 mm, 240 mm,
300mm, 400mm, 500mm, 600mm, 7
It is composed of various products having dimensional specifications of 00 mm, 800 mm, 900 mm, and 1000 mm, all of which are of a straight wall type. As is clear from FIGS. 1 to 3, in this embodiment, the U-shaped groove main body 2 made of polyethylene resin has a shape in which the left and right wall side portions 4 and 4 respectively stand upright from the wall bottom 3. Concave portions 5... And convex portions 6... Extending from the bottom portion 3 to the upper portions of the left and right wall side portions 4 and 4 are alternately and continuously formed in the longitudinal direction of the U-shaped groove 1 so as to be formed into a waveform. ing. The U-shaped groove 1 of the present invention has a shape in which the left and right wall side portions 4 and 4 respectively stand vertically from the wall bottom 3 as in this embodiment, and the U-shaped groove rises slightly upward toward the top. Shape may be adopted. Further, the U-shaped cross section of the U-shaped groove body 2 in the present invention includes a general one that forms a concave space forming a fluid passage, and in addition to the original U-shape, a U-shaped cross-section or an open upper surface. Including a semicircular cross section. Also, in this embodiment, a polyethylene resin was used as the hard synthetic resin.
Polyvinyl chloride, polypropylene, polyethylene terephthalate, polyamide, polyphenylene sulfide, etc. can be used, and a fiber reinforced resin (FRP, FRTP) containing unsaturated polyester or the like containing glass fiber, carbon fiber, organic fiber (Kevlar or the like), etc. ) Etc. are available.
Further, the U-shaped groove of the present invention can be formed by blow molding, rotational molding or the like. FIG. 4 is a cross-sectional view of U taken along line AA in FIG.
A cross-sectional view of the ridge portions 6 of the groove-shaped main body 2 is shown. As is clear from this figure, the ridge portions 6 extend directly to the upper ends of the left and right wall side portions 4 and 4 and the upper ends thereof. And extending outwardly from the bridge to form the bridging material receiving portions 8. However, as is clear from FIG. 5, which is a cross-sectional view of the concave streak portion 5 of the U-shaped groove main body 2 cut along the line BB in FIG.
The concave strips 5 are located on the left and right wall sides 4, 4
Instead of extending to the upper end as it is, it extends to the upper ends of the left and right wall side parts 4, 4 while taking a shape 5a which is inwardly curved, and extends outward from the upper end to form the bridging member receiving parts 8, 8
Is connected to. As a result, the upper portions of the two side walls 4, 4 of the U-shaped groove main body 2 have a structure as a whole that is narrowed from the outside to the inside. Due to this structure, when the U-shaped groove 1 is laid, the U-shaped groove main body 2 is further weakened against earth pressure from various load directions applied to the vicinity of the upper portions of the left and right wall side portions 4 and 4 which are particularly weak portions. This gives the rigidity.

Next, the upper ends of the two side walls 4 and 4 of the U-shaped groove body will be described in more detail. As shown in FIGS. 1 and 2, the upper ends of the left and right side walls 4 and 4 are formed. The bridging member receiving portions 8, 8 having flat surfaces have convex ridge portions 6.
· Holes 8 are provided at regular intervals in the longitudinal direction
a .. are drilled in pairs. As shown in FIGS. 7 and 8, this portion has a resin cross-section substantially L made of the same material as the U-shaped groove main body 2 shown in FIG.
A letter-shaped square angle member 7A is mounted so as to lie horizontally between the side walls 4,4. The angled material 7A has holes 7a, 7a formed at both ends, and these two holes 7a, 7a
And the right and left wall side portions 4 and 4 of the U-shaped groove main body 2 are aligned with the holes 8a and 8a of the bridging material receiving portion which are the upper ends, and the rivets 9 are used to attach the square angle material 7A to the U-shape. It is fixed to the bridging member receiving portions 8 at the upper end of the groove main body 2. The rivet 9 has a shape shown in FIG. 9 and is made of resin made of the same material as the U-shaped groove main body 2. The surface of the angled material 7A having a substantially L-shaped cross section without the holes 7a shown in FIG.
The both ends are cut out, and the surface with the hole 7a (FIG. 6)
It is designed shorter than (b)). Therefore, the surface without the hole 7a (FIG. 6 (c)) can be attached downward into the U-shaped groove main body 2. For this reason, square angle material 7A is
After being attached to the U-shaped groove main body 2, the angled material 7A does not protrude from the upper surface of the U-shaped groove 1, so that there is no risk of the operator being injured by the protruding portion, and the appearance is beautiful. Of course, the U-shaped groove 1 of the present invention can obtain high rigidity against the earth pressure applied to both wall side parts 4 and 4 due to the horizontal suspension of the angled material 7A, and the U-shaped groove 1 is not deformed or collapsed. Can be prevented. Further, as described above, the U-shaped groove 1 of this embodiment has the bridging material receiving portions 8, 8 for receiving the bridging material in the U-shaped groove main body 2 itself. There is no need for another auxiliary member for disposing the.
Further, since the rivet 9 is used for fixing the bridging member, the operation is much simpler than the fixing with screws, bolts and nuts. In addition, the angle material 7 which is a bridging material
Since the A and the rivet 9 are made of the same resin as the U-shaped groove main body 2, unlike a conventional metal bridging material, there is no decrease in strength or deterioration in appearance due to corrosion.
In addition, there is a feature that the possibility of injury to the operator is reduced due to its material. In this embodiment, the bridging member and the rivet are made of the same resin as that of the U-shaped groove body 2.
A hard synthetic resin or a fiber reinforced resin different from the U-shaped groove main body 2 may be used. As the bridging member, in addition to the shape of the square angle member, a flat plate having fixing holes provided at both ends can be used.

In the U-shaped groove 1 of the present invention, the side walls 4 and 4 of the U-shaped groove main body 2 are used in place of or in combination with a bridging material such as the above-mentioned angled material 7A which can be fixed with rivets 9.
Other bridging members which can be provided with a concave or convex bridging receiver at the upper inside and which can be mounted only by fitting into them can also be used. One preferable embodiment of the other bridging member is a square angle member 7B made of the same material as the U-shaped groove main body 2 and made of resin and having a substantially L-shaped cross section as shown in FIG. The U-shaped groove body 2 of the present embodiment is
It is designed so that B can be used alone or in combination with the angle angle member 7A. That is, as shown in FIGS. 1 and 2 and FIGS. 11 to 13, the U-shaped groove main body 2 of the present embodiment has a substantially L-shaped bridging member as a portion for receiving both ends of the angled angle member 7B. Receiving recesses 10, 10 are formed in pairs on the inner side of the wall sides 4, 4. More specifically, as shown in FIGS. 1, 11 and 12, the U
The left and right wall side portions 4 of the V-shaped groove main body 2, the concave streak portion 5 on the upper part 4,
The part of the inwardly curved shape 5a in... Is warped more inward at a certain interval with respect to the longitudinal direction of the U-shaped groove 1 and together with the adjacent ridge portions 6 on both sides. To form a flat wall side portion 5b extending to the upper end, and at the same time, as a bridging material receiving portion on the flat wall side portion 5b, can receive the end of the square angle material 7B. An L-shaped receiving recess 10 is provided. FIG. 11 (a)
FIG. 1 shows a state as viewed from the outside of the U-shaped groove main body wall side portion 4 in which the angled angle member 7B is fitted into the receiving concave portion 10, and FIG.
FIG. 1 (b) is a view of the same state as viewed from the inside of the wall side portion 4 (an enlarged view of a circle A portion in FIG. 11 (a)). Receiving recess 1
The shape of “0” is a substantially L-shape surrounding the shape of the cross section at the end of the angular angle material 7B, and an opening 10a is provided in the upper part of the receiving recess 10. The opening 10a facilitates the fitting of the angled material 7B, and the U-shaped groove 1
During the installation work, if foreign matter such as earth and sand enters the receiving recess 10, it can be easily removed. Further, in this embodiment, since the angle material 7B, which is a bridging material, is used so that the ridge side of the bent portion thereof faces upward, the bridging material is attached to the U-shaped groove main body 2 after being attached to the U-shaped groove body 2. 1 Does not protrude from the upper surface.
Therefore, there is no possibility that the worker is injured by the projecting portion of the bridging member at the work site, and the appearance is beautiful.

Another embodiment of another bridging material that can be used in place of the above-mentioned angled material 7A or that can be used in combination therewith is a tube material 7C shown in FIG. FIG. 15 shows the structure of the U-shaped groove 1 when this is used as a bridging member. The U-shaped groove main body 2 shown in FIG. 15 also includes a concave portion 5 and a convex portion 6 extending from the wall bottom portion 3 to the upper portions of the left and right wall side portions 4 and 4 alternately. By being formed continuously in the longitudinal direction, it is formed into a corrugated shape.
Takes an inwardly curved shape 5a at the upper part of the left and right wall sides 4, 4. In this embodiment, the concave streak portion 5
The upper part of the inwardly curved shape 5a is formed at the upper end thereof at regular intervals with respect to the longitudinal direction of the U-shaped groove 1, as shown in FIGS. Are formed so as to form a pair with each other, and a bridging member supporting portion 11b for supporting the fitted pipe member 7C is formed below the projecting portions 11a. Is formed.
That is, the projecting bridging material receiving portions 11, 11 for fitting both ends of the tubular material 7C, which is the bridging material, are projecting portions 11a,
11a and a bridging member supporting portion 11b, 11b below it. In this embodiment, a hollow rectangular tube 7C made of the same material as the U-shaped groove main body 2 as shown in FIG. 14 is used, but the bridging material is inserted into a tube, a tube, or both ends of another shape. The shape of the shaft member or the like forming the hole can be taken, and the corresponding projections 11a on the inner side of the wall sides 4 and 4 of the U-shaped groove main body 2 and the bridging member support portions 11b. Is designed in accordance with the shape of the bridging material to be used. The mounting of the angle material 7B and the tube material 7C, which are the other bridging members, to the corresponding U-shaped groove main body 2 does not require any fasteners such as screws, bolts and nuts, and rivets. Very easy and quick. Moreover, since the bridging member receiving portions of each U-shaped groove main body 2 are a part of the structure of each U-shaped groove main body 2 and are formed at the same time as molding, these other bridging materials are arranged above the U-shaped groove main body 2. No other auxiliary members are needed to do this. Also, since the bridging members 7B and 7C are made of a hard synthetic resin or a fiber reinforced resin, unlike a conventional bridging material made of metal, the strength does not decrease and the appearance does not deteriorate due to corrosion. Further, each of the bridging members is a U-shaped groove main body 2.
Although the example in which the resin is the same as described above has been described, a resin different from the U-shaped groove main body 2 may be used.

The U-shaped groove main body 2 of the present invention described in the above embodiment.
Further, as shown in FIG. 1 to FIG. 3 and the like, at a certain interval from the slightly lower portions of the left and right wall side portions 4, 4, over the concave streak portions 5. The rib portions 15 protruding outward are provided, so that the U-shaped groove main body 2 is given even more rigidity. This rib part 15 ...
Is a portion that protrudes outward from the U-shaped groove wall side portions 4 and 4 when buried in the soil, where sediment is deposited and the load is applied, so that the U-shaped groove main body 2 is Prevent from rising. As shown in FIGS. 2 and 3, one end of the U-shaped groove main body 2 is an external fitting connection portion 2a whose inner wall is designed to be slightly larger than other portions. Is designed so that another U-shaped groove main body 2 can be connected as an inner fitting connection portion 2b. When connecting the two U-shaped groove main bodies 2, the outer fitting connection portion 2a is fitted so as to cover the inner fitting connection portion 2b including the rib portion 15. In addition, in the connection method, in order to minimize leakage of water in the connection portion, the flow direction of water is from the inner fitting connection portion 2b of the U-shaped groove toward the outer fitting connection portion 2a of the other U-shaped groove. It is preferable to connect to.

In order to further increase the rigidity, the U-shaped groove 1 of the present invention uses a reinforcing material 20 which is the same material as the U-shaped groove main body 2 and which is a square angle material having a substantially L-shaped cross section as shown in FIG.
A bridging member receiving portion 8, which is an upper end of both wall side portions of the V-shaped groove main body 2,
8 and can be used by being mounted in the longitudinal direction. In the present embodiment, holes 20a through which the rivets 9 are passed through one surface of the reinforcing member 20 so that the reinforcing member 20 can be fixed at the same time as the angle angle member 7A as a bridging member by the rivet 9.
・ It is provided. As shown in FIG. 21 and FIG. 22, the reinforcing member 20 has the surface with the holes 20 a... At the upper end of both side walls of the U-shaped groove main body 2 so that the surface without the holes 20 a. It is mounted on the bridging material receiving portions 8, 8 along the longitudinal direction, and the angled angle material 7 </ b> A is superimposed on the bridging material receiving portions 8, 8, and is bridged between the bridging material receiving portions 8, 8. Square angle material 7A and reinforcement material 2
0 denotes holes 7a, 7a and holes 20a,
0a and the holes 8 of the bridging material receiving portions 8, 8 of the U-shaped groove main body 2.
The rivets 9 are attached and fixed at the same time while being aligned with a and 8a.

In the U-shaped groove 1 according to the present embodiment,
As an anti-floating material on the lower side of the wall bottom 3 of the V-groove main body 2, FIG.
The floating prevention angle angle member 30 made of the same resin as the U-shaped groove shown in FIG. U-shaped groove body 2
As shown in FIG. 20, an anti-floating material supporting groove 31 having a structure for sandwiching both angle surface portions of the anti-floating material is provided in a central portion of the bottom wall 3 of FIG.
0 is inserted into the groove 31 at the bottom of the U-shaped groove main body wall from one side to the opposite side, and is mounted so as to protrude outward from both side walls 4 and 4 of the U-shaped groove. When the U-shaped groove is buried, the floating prevention effect can be further enhanced by the earth and sand deposited on the floating prevention angle angle member 30. In addition, these reinforcing members 20 and floating prevention angle angle members 30 are also U-shaped.
It is also possible to use a hard synthetic resin or a fiber reinforced resin different from the groove main body 2.

[0015]

The U-shaped groove of the present invention comprising a U-shaped groove main body having the above-described shape and a bridging member, all of its members are made of a hard synthetic resin or a fiber reinforced resin.
However, the U-shaped groove main body of the present invention is configured such that a concave portion and a convex portion extending from the wall bottom to the upper portion of the left and right wall side portions are alternately formed continuously in the longitudinal direction of the U-shaped groove, thereby forming the wall bottom. From the bottom to the wall side, and the left and right wall sides are each raised from the bottom of the wall, but the concave portions are curved inward at the top of the left and right wall sides to increase rigidity. As a result of taking the shape, since the side walls are shaped to be narrowed from the outside to the inside, loads on the U-shaped groove, particularly in the vicinity of the upper portions of the left and right wall sides, from various directions. Has increased rigidity.
Therefore, even if the bridging material of the U-shaped groove is made of resin, the rigidity with respect to the earth pressure applied to both sides is determined by the reinforcing material made of metal.
It is possible to provide a U-shaped groove which is comparable to a U-shaped groove and hardly deformed. Also,
Since the U-shaped groove of the present invention does not use any metal member,
Compared to the case of using a metal bridging material as in the prior art, there is no reduction in strength or deterioration in appearance due to corrosion. Thus, the possibility of the worker's clothes being caught and broken is reduced. Furthermore, these resin-made reinforcing members are also lightweight, and the burden on the operator is reduced. Further, in the U-shaped groove of the present invention, since the upper ends of both side walls of the U-shaped groove main body each extend outward to form a flat bridging material receiving portion, when the bridging material is horizontally laid. Does not require the use of an auxiliary member for arranging the bridging member above the U-shaped groove main body. The bridging member can be directly tacked to the bridging member receiving portion by using a resin rivet which is a fixing tool, and the operation is much easier than the operation such as screwing. In addition, the bridging member of the U-shaped groove of the present invention has an advantage that it is easy to manufacture and easy to handle because it does not have a complicated shape as in the prior art. The left and right wall sides of the U-shaped groove main body of the present invention are further provided with outwardly protruding rib portions to give more rigidity to the U-shaped groove main body, and to be buried in the soil. Sediment accumulates on the outer side of the U-shaped groove wall side and the load is applied, so that the floating of the U-shaped groove main body can be prevented. However, in addition to the bridging material, it is better to use a reinforcing material along the longitudinal direction of the U-shaped groove in the bridging material receiving portions at the upper ends of both side walls of the U-shaped groove simultaneously with the bridging material. Rigidity is obtained. Therefore, according to the present invention, it is possible to provide a U-shaped groove that is lightweight but has high rigidity and high laying efficiency and safety.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating one embodiment of a U-shaped groove of the present invention.

FIG. 2 is a plan view showing one embodiment of a U-shaped groove of the present invention.

FIG. 3 is a side view of the U-shaped groove shown in FIG.

FIG. 4 is a sectional view of a protruding portion of the U-shaped groove main body cut along the line AA in FIG. 2;

FIG. 5 is a cross-sectional view of the concave portion of the U-shaped groove main body cut along the line BB in FIG. 2;

FIG. 6 is a plan view (a), a front view (b), and a side view (c) of a square angle material that is a bridging member that is horizontally mounted on the U-shaped groove main body of the present invention.

FIG. 7 is a partial view from above showing a state in which a square angle material is used in a bridging member receiving portion of the U-shaped groove main body.

FIG. 8 is a sectional view taken along line CC of FIG. 7;

FIG. 9 is a plan view (a) and a front view (b) of a rivet for fixing a corner angle material.

FIG. 10 is a front view (a) and a side view (b) of a square angle material as an example of another bridging material.

FIG. 11 (a) is a view of a state in which a square angle material is fitted into a receiving recess viewed from the outside of a wall side of a U-shaped groove main body, and an enlarged view of a portion of a round frame A in the same state as viewed from the inside of a wall side. (B)
It is.

FIG. 12 is a partial view from above showing a state in which the angle member of FIG. 10 is fitted into a receiving recess of the U-shaped groove main body.

FIG. 13 is a cross-sectional view taken along line DD of FIG.

FIG. 14 is a front view (a) and a side view (b) of a tube as another example of another bridging member.

FIG. 15 is a view illustrating another embodiment of a U-shaped groove designed to use the tube shown in FIG. 14;

FIG. 16 is a partial view of a state in which the tube material shown in FIG. 14 is fitted to a protrusion of a U-shaped groove main body, as viewed from above.

FIG. 17 is a sectional view taken along line EE in FIG. 16;

18A and 18B are a plan view (a) and a front view (b) of a reinforcing member mounted on the bridging member receiving portion along the longitudinal direction of the U-shaped groove.

FIG. 19 is a plan view (a) and a front view (b) of a square angle material as a floating prevention material.

20 is a view showing a state in which the floating prevention angle angle member of FIG. 19 is inserted into the bottom of the U-shaped groove main body wall.

21 is a partial view of a state in which the angle member of FIG. 6 is bridged over a bridge member receiving portion of the U-shaped groove main body, to which the reinforcing member of FIG. 18 is attached, as viewed from above.

FIG. 22 is a sectional view taken along line FF of FIG. 21;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 U-shaped groove 2 U-shaped groove main body 3 Wall bottom part 4 Wall side part 5 Concave part 5a Inwardly curved shape 6 Convex part 7A Square angle material 7B Square angle material 7C Tube material 8 Bridge material receiving part 9 Rivet 10 Receiving recess 11a Protrusion 11b Support 15 Rib 20 Reinforcing material

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akira Mito 6-6-4 Yachiyodaito Yachiyo-shi, Chiba Pref. Life Plaza A-106 F-term (reference) 2D063 CA06 CA12

Claims (5)

[Claims] 1. A U-shaped groove main body forming a wall having a U-shaped cross section, wherein a concave portion and a convex portion extending from a bottom of a wall of the main body to upper portions of right and left wall sides are alternately formed. A U-shaped groove comprising a U-shaped groove main body formed in a corrugated shape by continuously forming the U-shaped groove in the longitudinal direction, and a bridging member bridging between left and right wall sides of the main body. The left and right wall sides of the main body respectively stand vertically or outwardly from the bottom of the wall, and at the top thereof, concave portions are formed inwardly inward to increase rigidity, and both wall sides are formed. The upper ends of the portions each extend outward to form a bridging material receiving portion having a flat surface, and both ends of the bridging material are fixed on the bridging material receiving portion. A U-shaped groove made of a hard synthetic resin or a fiber reinforced resin. 2. The U-shaped groove according to claim 1, wherein the bridging member is formed of a flat plate or a square angle member having a flat upper surface. 3. Both ends of the bridging member are riveted to the bridging member receiving portion using rivets made of a hard synthetic resin or a fiber reinforced resin.
The U-shaped groove according to claim 1. 4. The U-shaped groove according to claim 1, wherein the U-shaped groove main body is provided with rib portions protruding outward to increase rigidity on left and right wall side portions. 5. The method according to claim 1, further comprising a reinforcing member made of a hard synthetic resin or a fiber reinforced resin, which is mounted on the bridging member receiving portion along a longitudinal direction of the U-shaped groove. The U-shaped groove according to 1.