JP3511176B2 - U-shaped groove - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a U-shaped groove which can be used for agricultural and industrial waterways and drainage channels, and general civil engineering waterways and drainage channels. 2. Description of the Related Art Conventionally, concrete U-shaped grooves have been used as civil engineering development sites in Yamano and gutter drains on general roads. In recent years, concrete U-shaped grooves have been used instead of concrete U-shaped grooves.
U-shaped grooves made of synthetic resin 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 transport side and construction side. Because of the low side wall, 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, conventionally, at the upper part of the U-shaped groove, which is the weakest part of the U-shaped groove, a reinforcing material bridging both side walls of the U-shaped groove is attached at an appropriate position in the width direction, and the bottom wall portion of the U-shaped groove is connected to the side wall portion. Has been devised to improve the rigidity against the earth pressure on the side wall of the U-shaped groove made of synthetic resin by shaping the resin into a corrugated or similar uneven shape. [0003] Such an improved technique is disclosed, for example, in Japanese Patent No.
No. 65562. In this publication, a bottom wall and both side walls are formed integrally and provided in a U-shaped cross section to form a fluid passage, and the bottom wall and the bottom wall are formed to improve rigidity. In the U-shaped groove formed in a corrugated shape so that a large number of ridges and ridges extending in a direction perpendicular to the longitudinal direction are formed on both side walls, the ridges and the ridges are formed at respective upper ends of the both side walls. Along with
There is disclosed a U-shaped groove having a partition wall portion formed integrally with the side wall portion at each upper end of the both side wall portions to fill the concave streak. [0004] However, in the U-shaped groove disclosed in Japanese Patent No. 3065562,
Each partition is an element that individually fills the concave stripe. That is, the partition portions are each independently present,
Neither are they joined together to form a continuous wall. Therefore, it is difficult to say that the rigidity of the upper portion of the U-shaped groove is sufficiently improved, especially when a torsional stress or a local stress is applied to the side wall from the lateral soil. The side wall may be distorted or deformed. Therefore, it has been a problem to provide a U-shaped groove having higher rigidity that can sufficiently withstand the earth pressure from the side on the left and right side walls, particularly the upper part of the U-shaped groove. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is a U-shaped groove made of a hard synthetic resin or a fiber-reinforced resin. By forming the ridges alternately and continuously in the longitudinal direction of the grooves, in the U-shaped groove formed in a corrugated shape, the concave ridges and the convex ridges are U
The groove is formed substantially continuously from the bottom wall of the groove to the upper ends of the left and right side walls, and the upper portions of the left and right side walls are entirely
To form a shape narrowed from the outside to the inside, and, at the upper ends of the left and right side walls , close the concave streak and
A reinforcing wall extending further outward than the top of the ridge ,
The reinforcing wall is formed continuously in the longitudinal direction of the groove, and the reinforcing wall is
Formed on the upper surface of the groove, extending in the longitudinal direction of the groove
At the same time, the width of the reinforcing wall is equal to the bottom of the concave ridge and the convex ridge.
It is longer than the interval with the top, and the length up to 5 times the interval
It relates to a U-shaped groove characterized by having. The U-shaped groove made of a hard synthetic resin or a fiber reinforced resin in the present invention is formed into a corrugated shape by continuously forming concave and convex portions alternately in the longitudinal direction of the groove in order to improve rigidity. Further, the concave and convex portions 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 to the case where the concave ridge portion and the convex ridge portion are continuously formed up to the upper ends of the right and left side wall portions from the bottom wall portion of the U-shaped groove, they may be partially discontinuously or intermittently formed. Good. At the upper ends of the right and left side walls of the U-shaped groove, a reinforcing wall which closes the concave and convex portions and further extends outward is formed continuously in the longitudinal direction of the U-shaped groove.
Concave portion by the reinforcing walls with is completely closed, concave
Since the ridges and the ridges are joined to each other to form a continuous wall in the longitudinal direction, the left and right side walls of the U-shaped groove are compared with the structure in which the ridges are individually closed. The upper part of the portion is less susceptible to torsional deformation and local deformation, and is less likely to be bent by earth pressure from the side. The width of the reinforcing wall is longer than the interval between the bottom of the concave ridge and the top of the convex ridge,
Preferably it has a length of up to twice. If the distance between the bottom of the concave ridge and the peak of the convex ridge is shorter, the concave ridge cannot be completely closed and a continuous wall cannot be formed, and the intended effect of improving rigidity cannot be achieved. If the distance is 5 times or more, the rigidity hardly increases and the production cost increases, which is not preferable. The reinforcing wall according to the present invention is formed by forming a concave ridge and a convex ridge by drawing inward at the left and right side walls.
It is preferably formed in a groove. In this case, the upper portions of the right and left side wall portions of the U-shaped groove have a shape narrowed inward from the outside as a whole. At the same time as the rigidity against the earth pressure is increased, the lower part of the side wall part is more outwardly spread than the upper part.
The effect of preventing the floating of the groove is also high. This is a very preferable mode, since a ridge is extended on the upper surface of the reinforcing wall in the longitudinal direction of the U-shaped groove, so that the rigidity is further improved at the upper portions of the left and right side walls. . The ridge portion,
The reinforcing wall may be formed so as to rise vertically upward from the outer edge as it is, or may be a mere projection. There is no particular limitation on the height from the reinforcing wall. In the U-shaped groove of the present invention, it is possible to attach a reinforcing material capable of improving the rigidity of the U-shaped groove along the longitudinal direction and to traverse and fix the reinforcing member between the upper portions of the left and right side walls. A bridging material can also be attached, and examples thereof include bridging materials having a substantially L-shaped, substantially T-shaped, or substantially cross-shaped cross section. These bridging members can be fixed to the U-shaped groove by fitting both ends thereof to the right and left side walls of the U-shaped groove. For example, when attaching a bridge member having a substantially L-shaped cross section, a bridge member receiving portion having a substantially L-shape corresponding to the shape of both ends of the bridge member is formed in advance on the left and right side walls of the U-shaped groove. In doing so, by fitting both ends of the bridging material into each of the receiving parts at the time of construction,
The bridging member can be easily fixed to the U-shaped groove. Also,
Other fixing methods of the bridging material to the U-shaped groove of the present invention include:
There is a mode in which the bridging member is riveted on the reinforcing walls on the left and right sides of the U-shaped groove by rivets. In this case, it is necessary that both ends of each bridging member are provided with holes for passing rivets, and are cut out so as to be assembled between left and right side walls of the U-shaped groove. By attaching these bridging members to the U-shaped groove, a favorable effect is obtained such that more rigidity is imparted to the upper portions of the left and right side walls of the U-shaped groove. Furthermore, in the U-shaped groove of the present invention, bulging portions protruding outward can be provided on the left and right side wall portions. As a result, not only can the rigidity be imparted to the U-shaped groove, but also the bulging portion can be more effectively fixed because the sediment accumulates and the load is applied when the U-shaped groove is buried. And
It helps to prevent the rise of U-shaped ditch due to the rise of groundwater level. As the material of the U-shaped groove of the present invention, a hard synthetic resin such as polyethylene resin, polyvinyl chloride, polypropylene, polyethylene terephthalate, polyamide, and polyphenylene sulfide, and a fiber reinforced resin such as FRP and FRTP are preferable. As the shape of the U-shaped groove main body, in addition to the original U-shape, a shape that rises vertically from the bottom of the wall or a shape that rises slightly outward toward the top may be used. 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. Embodiment 1. In Embodiment 1, a U-shaped groove 8 is formed in which a concave ridge and a convex ridge are drawn inward at the upper portions of the left and right side walls.
Is shown. FIG. 1 is a perspective view showing the U-shaped groove 8 of this embodiment, and FIG. 2 is a plan view of the U-shaped groove 8 of this embodiment. As can be seen from FIG. 1, in the present embodiment, the concave ridges 11 and the convex ridges 12 extending from the bottom wall portion 9 to the upper portions of the left and right side wall portions 10 are alternately formed continuously in the longitudinal direction of the groove. It is shaped into a waveform. The concave ridge 11 and the convex ridge 12
Are formed continuously up to the upper ends of the left and right side wall portions 10, but are formed by drawing inward at the upper portions of the left and right side wall portions 10. With this structure, the rigidity of the U-shaped groove 8 against the earth pressure from various directions applied to the upper portions of the left and right side wall portions 10 is increased, and at the same time, the lower portion is more outward than the upper portion of the right and left side wall portions 10. The structure of the U-shaped groove 8 has a high floating prevention effect when buried. Further, at the upper end 25 of the left and right side wall portions 10, the reinforcing wall 13 is
It extends and closes the concave ridge 11, and the convex ridge 12
The wall extends further outward and is formed continuously in the longitudinal direction of the U-shaped groove 8. In the present embodiment, the width of the reinforcing wall 13 is the width of the bottom 27 of the concave stripe 11 and the height of the convex stripe 12.
6 is slightly longer than the interval from 1.2 to 1.
The length is set to five times. The outer edge of the upper surface of the reinforcing wall 13 has a shape in which a ridge 14 is continuously formed in the longitudinal direction of the U-shaped groove 8. Due to the presence of the reinforcing walls 13, the rigidity of the left and right side wall portions 10, particularly the upper portion, is further improved.
3 itself is also improved, and when buried, its strength against the surrounding earth pressure is increased. In the present embodiment, as described above, the protruding ridges 14 have a structure that rises from the outer edge of the reinforcing wall 13 and are continuously formed in the longitudinal direction of the U-shaped groove 8. A structure may be adopted in which the upper surface rises from a substantially central portion and is formed continuously in the longitudinal direction of the U-shaped groove 8, or may be formed in the longitudinal direction of the U-shaped groove 8 by rising from the inner edge of the reinforcing wall 13. The structure may be adopted. The U-shaped groove 8 also has a horizontal bridge between the left and right side walls 10.
A bridging member 15 having a substantially L-shaped cross section is attached as a bridging member for fixing. As shown in FIG. 2, the bridging member 15 has a substantially L-shaped bridging member receiving portion 1, both ends of which are provided on the inner surfaces of upper portions of both side walls of the U-shaped groove 8.
6 can be fitted into each of them, so that there is no need to attach studs and workability is good. Further, the bridging member 17 having a substantially L-shaped cross section but having both ends cut out is provided with a rivet 18.
Can be assembled to the hole 13a on the reinforcing wall 13. Further, as shown in FIGS. 1 and 2, bulging portions 19 for increasing rigidity are provided on the left and right side wall portions 10 of the U-shaped groove 8 of the present invention. It is provided over the ridge portion 12, and further rigidity is given to the side wall portion 10. The bulging portion 19 not only has the effect of improving rigidity but also has the effect of preventing the U-shaped groove 8 from floating since earth and sand accumulate when buried in the soil and a load is applied from above. Since the bottom wall portion 9 of the U-shaped groove 8 is provided with the anti-floating material support groove portion 21 for fitting the anti-floating material 20,
By attaching the anti-floating material 20 to this portion, a further anti-floating effect can be obtained. As described above, in the U-shaped groove of the present invention, the upper end of the side wall is formed by the reinforcing wall which closes the concave and convex portions and further extends outward. Are formed continuously in the longitudinal direction of the groove, and a ridge portion extending in the longitudinal direction of the groove is formed on the upper surface of the reinforcing wall. Therefore, especially Patent 306
Compared with the U-shaped groove disclosed in Japanese Patent No. 5562, the U-shaped groove of the present invention has remarkably improved rigidity especially at the upper end of the side wall portion, and therefore, when buried, it is loaded by soil on the side thereof. Stress (torsional stress, local stress, etc.)
This has the effect that distortion and deformation are extremely unlikely to occur.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing 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. [Description of Signs] 8 U-shaped groove 9 Bottom wall 10
Side wall 11 Concave ridge 12 Convex ridge 13
Reinforcement wall 14 Ridge 15 Bridge material 16
Bridge material receiving section 17 Bridge material 18 Rivets 19
Swelling portion 20 Anti-floating material 21 Anti-floating material support groove
22 Upper end of side wall 23 Bottom of concave ridge 24 Peak of convex ridge 25
Upper end of side wall 26 Top of ridge 27 Bottom of ridge

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koei Terasawa 3-1709-51, Iiyama Mitsumachi, Funabashi City, Chiba Prefecture (56) References JP-A-11-1956 (JP, A) JP-A-61-162645 ( JP, A) JP-A-2000-129768 (JP, A) JP-A-1-164381 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E03F 5/04

Claims (1)

(57) [Claims 1] U made of hard synthetic resin or fiber reinforced resin
In the U-shaped groove formed by alternately and continuously forming the concave ridge and the convex ridge in the longitudinal direction of the groove, the concave ridge and the convex ridge are formed in the U-shaped groove. together they are formed substantially continuously from the bottom wall to the upper end of the side wall portions of the left and right, the left
The upper part of the right side wall is narrowed down from outside to inside as a whole
At the upper ends of the left and right side walls, a reinforcing wall that closes the concave ridge and extends outward beyond the top of the convex ridge is formed in the longitudinal direction of the groove. Continuously formed
The reinforcing wall is further provided on the upper surface thereof in the longitudinal direction of the groove.
Along with forming an extending ridge, the width of the reinforcing wall is
Longer than the distance between the bottom of the concave ridge and the top of the convex ridge
And has a length of up to 5 times the interval.
U-shaped groove.