JP6415898B2 - Groove-head joint universal joint and groove-head joint - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a grooved joint constructed by fitting a joined body composed of a plurality of linear members into a ground groove that has been excavated and connected, and more specifically, applied to a bent portion of a grooved part bent at an arbitrary angle. The present invention relates to a universal joint of a possible groove and groove coupling body and a groove and groove coupling body including the same.

  Conventionally, various types of U-shaped grooves made of steel, concrete, resin, etc. have been proposed as groove rods for agricultural waterways, industrial waterways, and temporary waterways for civil engineering. Both types use a plurality of linear members as a groove rod connecting body, etc., but since these groove rods are formed according to the terrain, they are not necessarily made of straight members. It was necessary to change the direction of the flow path at some point, not just the connected body.

  In addition, since the groove ridges are constructed according to the topography, the connecting angle between the groove ridges at the turning point varies depending on the topography, and the bending angle in the horizontal plane and the gradient in the vertical plane vary. There is a problem that it is difficult to cope with the bent portion using an off-the-shelf product.

  In order to solve such a problem, Patent Document 1 discloses that the connection work is very simple, does not cause water leakage after connection, and can be bent at an angle according to the situation of the construction site. For the purpose of providing a U-shaped groove, it is made of hard synthetic resin or fiber reinforced resin, has a substantially U-shaped cross section, and peaks and valleys extending from the bottom to the left and right sides alternately in the longitudinal direction of the groove A flexible U-shaped groove having a flexible bellows-like portion formed is disclosed (claim 1 of patent document 1, paragraphs 0005 and 0012 of the specification, FIG. 1 of the drawings). Etc.).

  Patent Document 2 discloses that a side wall portion of a bent portion can be prevented from falling down due to earth pressure with a simple configuration without impairing the bendability of the bent portion that allows U-shaped grooves to be connected in a bent arrangement. For this purpose, resin-made U-shaped grooves are formed by extending connecting portions 14a, 14b respectively connecting U-shaped grooves on both sides of a bent portion 12 formed in a bellows shape with a waveform perpendicular to the longitudinal direction. In the free elbow 30, a reinforcing member 32 that prevents the side wall portion of the bent portion 12 from falling is inserted and attached to one or a plurality of locations of the bent portion 12 along the inner surface of the bent portion 12. U-grooved elbows are disclosed (see claim 1 of patent document 2, paragraphs 0007 and 0009 to 0012 of the specification, FIG. 5 of the drawings, etc.).

  Such a flexible U-shaped groove described in Patent Document 1 and a U-shaped grooved elbow described in Patent Document 2 have a bending, torsional strength, sand and the like that can maintain a U-shape as a flow path. Surface hardness and the like that can resist wear due to flow down are required. As a result, in order to ensure the durability as a groove rod, the bellows-like portion is also required to have a certain degree of rigidity. Therefore, the bellows-shaped portion is not easily deformed, and it is difficult not only to deform the bellows-shaped portion in accordance with the bending angle between the U-shaped groove and the U-shaped groove at the direction change point of the flow path. There is a problem that it is difficult to connect the U-shaped groove and the U-shaped groove while deforming the bellows-shaped portion.

  In particular, the U-shaped groove provided with these bellows-shaped portions has sufficient adaptability and flexibility to any bending portion of the groove rod even when, for example, an elastic material made of rubber is used instead of the bellows-shaped portions. It is thought that it will be prepared. However, when a rubber elastic material is used for the bent portion of the groove rod, the elastic material has a large restoring force from the viewpoint of the bending rigidity described above, and when connecting in a state where the U-shaped groove and the U-shaped groove are bent, There is a problem that it is difficult to hold in a bent state by human power and work efficiency is poor.

  In the invention related to the flexible U-shaped groove described in Patent Document 1 and the U-shaped grooved elbow described in Patent Document 2, the flexibility is improved by increasing the number of ridges in the bellows-shaped portion. Although it is considered possible to improve the working efficiency, the straight part of the U-shaped groove other than the U-shaped grooved elbow (bent part), that is, the straight member of the grooved rod connecting body is the joint member (bellows) The unit price is overwhelmingly lower than that of a flexible elbow), and if the number of ridges is increased to increase the distance of the bellows-shaped portion (universal elbow), the manufacturing cost and installation (construction) cost will increase. .

JP 2003-336244 A JP 2003-064761 A

  Accordingly, the present invention has been devised in view of the above-described problems, and the object of the present invention is to shorten the universal joint portion as much as possible while ensuring the function and durability as a groove rod, and to provide a bellows-like portion. It is an object of the present invention to provide a universal joint for a grooved rod connection body that can improve the working efficiency of the installation operation of the entire grooved groove linked body by improving the flexibility of the grooved grooved body, and a grooved groove linked body including the same.

The universal joint of the grooved rod connection body according to the first aspect of the present invention is a universal joint of a grooved rod connection body used at a bent portion of a grooved rod connection body laid while being fitted and connected to a ground groove, and is a rubber formed in a corrugated shape. It has a bellows-like portion of an elastic body, and a notch groove is formed in the inner layer and / or the outer surface of the bellows-like portion, and the notch groove intersects the direction along the ridge of the bellows-like portion. It has the groove | channel along the longitudinal direction of the said grooved rod coupling body to do.

  The universal joint of the grooved rod connector according to the second invention is characterized in that, in the first invention, the notch groove is formed in a straight line.

  According to a third aspect of the present invention, in the first or second invention, the notch groove is formed on an inner surface or an outer surface near the top and bottom of the bellows-like portion of the bellows-like portion. It is characterized by.

  According to a fourth aspect of the present invention, there is provided a universal joint for a grooved rod connection body according to any one of the first to third inventions, wherein a plurality of the notched grooves are formed along the flanges of the bellows-shaped portion. And

  In the universal joint of the groove-joint assembly according to the fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the plurality of the notched grooves are respectively formed along two directions intersecting each other. And

  According to a sixth aspect of the present invention, there is provided a universal joint for a grooved rod connection body according to the fifth aspect, wherein the two directions are orthogonal to each other.

  A grooved joint assembly according to a seventh aspect of the present invention is provided, and the grooved joint assembly according to any one of claims 1 to 6 is provided.

  According to the first to seventh aspects of the present invention, the rubber elastic body has a corrugated elastic bellows-like portion, and a notch groove is formed on the inner surface and / or the outer surface of the bellows-like portion. In order to ensure the function and durability as a groove rod, even if hard rubber such as chloroprene rubber (CR rubber) is used as the rubber elastic body, the notched groove improves the flexibility of the bellows-like part Thus, it is possible to improve the work efficiency of the installation work of the entire grooved connector assembly. For this reason, according to the first to seventh inventions, even if the bellows-like portion is shortened as much as possible, it is ensured that the linear members of the grooved rod connecting body are connected at an arbitrary angle which is a function of the universal joint. It is possible to reduce the manufacturing cost and installation (construction) cost of the entire grooved connector.

  In particular, according to the second invention, since the notch groove is linear, it is easy to form the notch groove by extrusion molding, cutting, or the like, and the manufacturing cost of the universal joint of the grooved rod connected body can be reduced.

  In particular, according to the third invention and the fourth invention, it becomes easy to bend the universal joint of the grooved rod joint along the bellows of the bellows-like portion, and further, the flexibility of the bellows-like portion is improved to improve the entire grooved rod joint. The work efficiency of the installation work can be improved.

  In particular, according to the fifth aspect, since the plurality of notched grooves are formed along two directions intersecting each other, the bent portion of the groove is bent not only on the horizontal plane but also on the vertical plane. Even if a torsional stress is generated in the universal joint of the groove-and-groove coupling body, the restoring force of the rubber elastic body against the torsional stress is eased by the notch groove, and the entire groove-and-groove coupling body is installed. The work efficiency of work can be improved.

  In particular, according to the sixth invention, since the notch grooves are orthogonal to each other, the restoring force with respect to the bending stress of the rubber elastic body and the restoring force with respect to the torsional stress can be efficiently and simultaneously relaxed, Furthermore, it is possible to improve the work efficiency of the installation work for the entire grooved connector.

  In particular, according to the seventh aspect of the present invention, it is possible to achieve the above-mentioned effects in the grooved connector assembly.

It is a perspective view which mainly shows the installation state of the slotted rod coupling body which concerns on embodiment of this invention, and its universal joint. It is a top view which shows a grooved connector coupling body same as the above, and its universal joint. It is a side view which shows a grooved joint body same as the above and its universal joint. It is a perspective view which shows the U-shaped groove | channel of a grooved rod coupling body same as the above. It is the side view which looked at the U-shaped groove same as the above along the width direction. It is the front view which looked at the U-shaped groove same as the above along the longitudinal direction. It is the side view which looked at the universal joint (rubber board) of the slotted rod coupling body of FIG. 1 along the width direction. It is a perspective view which shows a universal joint (rubber board) same as the above. It is a perspective view which shows the installation state of the universal joint same as the above. It is an enlarged plan view which mainly shows the connection part of the U-shaped groove | channel and universal joint of the groove-rod coupling body of FIG. It is a perspective view which mainly shows the connection part of the U-shaped groove | channel and universal joint of a grooved rod coupling body same as the above. It is the side view which looked at the universal joint (rubber board) which concerns on 2nd Embodiment of this invention along the width direction. It is a perspective view which shows a universal joint (rubber board) same as the above. It is a perspective view which shows the installation state of the universal joint same as the above. It is the side view which looked at the universal joint (rubber board) which concerns on 3rd Embodiment of this invention along the width direction. It is a perspective view which shows a universal joint (rubber board) same as the above. It is a perspective view which shows the installation state of the universal joint same as the above. It is the side view which looked at the universal joint (rubber board) which concerns on 4th Embodiment of this invention along the width direction. It is a perspective view which shows a universal joint (rubber board) same as the above. It is a perspective view which shows the installation state of the universal joint same as the above.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a universal joint of a grooved rod connector according to an embodiment of the present invention and a grooved rod connector using the same will be described in detail with reference to the drawings.

  A grooved connector 1 according to an embodiment of the present invention will be described with reference to FIGS. First, with reference to FIG. 1, a case where the groove rod connection body 1 is installed in the groove rod K having the direction change point C where the flowing water direction changes from the A direction to the B direction will be described as an example. The groove ridge K where the groove ridge coupling body 1 is installed is a groove having a U-shaped cross section in the longitudinal direction that is used as a water channel for passing water while changing water from the A direction to the B direction. Used for purposes such as irrigation canals or temporary construction canals. Of course, it may be either open or undercut, but the illustrated form illustrates open.

  The groove rod connecting body 1 according to the embodiment of the present invention includes a plurality of U-shaped grooves 2,..., 2 having the same shape installed in a linear portion of the groove rod K, and bending of the groove rod K at the turning point C. Consists of universal joints 3 etc. installed in the part, constructed by fitting and connecting to the excavated graben, preventing running water from penetrating into the ground and disappearing, and gravel eroding It has a function to prevent this. In addition, the X direction in the figure is the longitudinal direction of the grooved rod connecting body 1 in which the water channel extending direction (waterflow direction) flows water, the Y direction is the width direction of the grooved rod connecting body 1, and the Z direction is orthogonal to the X direction. It is the vertical direction of the vertical section (the X, Y, and Z directions in the figure all indicate the same direction).

  The plurality of U-shaped grooves 2,..., 2 are linearly connected by bolting or the like with the water channel extending direction (X direction) for flowing water as the longitudinal direction, and the universal joint 3 is connected to the bent portion of the groove 渠 K. Is installed. At this time, the upstream U-shaped grooves 2 are connected to each other such that the upstream U-shaped grooves 2 are higher than the downstream U-shaped grooves 2 so that the connection portions are less susceptible to water flow resistance (see FIG. 1 and the like).

(U-shaped groove of grooved rod connection)
As shown in FIGS. 4 to 6, the U-shaped groove 2 includes a U-shaped groove main body 20 having a U-shaped vertical cross section orthogonal to the longitudinal direction, and a longitudinal direction of the U-shaped groove main body 20. It is comprised from the collar part 21 etc. which protruded laterally from the upper end. As shown in FIGS. 5 and 6, the U-shaped groove body 20 is made of a corrugated steel sheet having a thickness of about 1.6 mm to 4.0 mm (waveform: step 13 mm × pitch between peaks and peaks 68 mm). A steel member whose vertical cross section perpendicular to the longitudinal direction is formed into a U shape by press molding or the like. ing.

(Universal joint of grooved joints)
As shown in FIGS. 7 and 8, the universal joint 3 according to the embodiment of the present invention includes a rubber plate 30 formed into a predetermined shape by extrusion molding or the like from hard rubber such as chloroprene rubber (CR rubber), It has a function of connecting the U-shaped grooves 2 at an arbitrary bending angle including torsional displacement at the bent portion of the groove K (see also FIG. 1). The rubber plate 30 has a bellows-like portion 31 formed with a corrugated collar provided in the center, and flat plate-like connecting portions 32, 32 provided on the left and right sides of the bellows-like portion 31. ing. The hard rubber refers to a rubber elastic body having a hardness of 70 ° or more according to JISK6253 durometer hardness test (type A) such as chloroprene rubber and nitrile rubber.

  As shown in FIGS. 7 to 9, the bellows-like portion 31 has two large ridges 33, 33 projecting to the back side that is the outside, and also on the back side of the ridges 33, 33 arranged on the left and right sides. Two protruding small flanges 34 and 34 are provided, and when these flanges 33 and 34 expand or narrow, the difference in horizontal and vertical angles between the U-shaped grooves 2 connected by the universal joint 3 is absorbed. It has a function (see also FIG. 1 etc.). In addition, arc-shaped cutout grooves M1 and M2 are formed in the surface layer of the bellows-shaped portion 31. The cutout grooves M1 and M2 will be described in detail later. In addition, when the universal joint is formed of only hard rubber, the wall 34 is used to absorb the difference between the horizontal and vertical angles if the rigidity is low and easily deforms with respect to earth pressure depending on the installation conditions. Instead, it may be used for fitting and installing a U-shaped reinforcing steel bar.

  As shown in FIG. 10, the connecting portion 32 is a U-shaped metal fitting 4 formed in a U shape from a strip of a metal flat plate such as a steel plate, and between the upper end of the U-shaped groove body 20 from above. It is a portion connected to the U-shaped groove 2 by being pinched and fastened with bolts. The U-shaped fitting 4 may be formed of a round bar-like member such as round steel, and the U-shaped fitting 4 may have a shape that allows the connection portion 32 to be attached to the U-shaped groove body 20 or the like. For example, there is no particular limitation.

  Further, as shown in FIG. 10, a water stop material 5 made of a rubber elastic body such as rubber packing or a highly viscous plastic material may be engaged between the connection portion 32 and the U-shaped groove 2. By doing so, the water-stopping property between the U-shaped groove 2 and the universal joint 3 is improved, and it is possible to prevent the water passing through the grooved rod connecting body 1 from disappearing from the ground groove and Water efficiency can be improved.

  As described above, the rubber plate 30 has a vertical cross section perpendicular to the longitudinal direction as shown in FIGS. 9 and 11 by connecting the connection portions 32 at both ends to the U-shaped groove 2 with the U-shaped fitting 4. Becomes substantially U-shaped, and the flanges 33 and 34 of the bellows-shaped portion 31 protrude outward along the U-shape. For this reason, the universal joint 3 can exhibit the function as a universal joint. When the thickness of the universal joint is increased in consideration of wear, in all the following embodiments, the shape of the vertical cross section perpendicular to the direction of the water channel through which water flows is substantially U-shaped from the beginning. You may shape | mold.

  Next, an embodiment of the notched groove of the bellows-like part, which is a characteristic part of the present invention, will be described in detail.

[First Embodiment]
First, the notch groove of the universal joint 3 which concerns on 1st Embodiment of this invention is demonstrated using FIGS. 7-9. As described above, the surface layer of the bellows-like portion 31 of the universal joint 3 according to the first embodiment is formed with a plurality of two kinds of arc-shaped notch grooves M1 and M2 that are orthogonal to each other at predetermined intervals. ing. Of course, these cutout grooves M1 and M2 may be functionally grooves having a V-shaped cross section. However, if there are sharp corners in the groove, the cutout grooves M1 and M2 have an arc shape. Here, the surface layer refers to a portion of half or less of the thickness of the rubber plate 30 regardless of the front and back sides.

  The notch groove M1 is a groove for bending stress having a circular arc cross section for improving the flexibility and expansion / contraction function of the flange 33 of the bellows-shaped portion 31, and is formed on the flange 33 on the inner surface and the outer surface of the bellows-shaped portion 31. It is formed linearly along. For this reason, the flexibility and the expansion / contraction function of the bellows-like part 31 are improved, the restoring force of the universal joint 3 made of a rubber elastic body is relaxed, and the flange 33 of the bellows-like part 31 can be easily opened and closed. Thus, the efficiency of the connection work between the U-shaped groove 2 and the universal joint 3 is improved.

  The notch groove M2 is a groove for torsional stress having an arc cross section for improving the expansion / contraction function with respect to torsion acting on the bellows-like portion 31, and extends along the X direction on the inner surface of the bellows-like portion 31. It is formed in a straight line. For this reason, the expansion / contraction function with respect to torsion of the bellows-like portion 31 is improved, the restoring force of torsion of the universal joint 3 made of a rubber elastic body is alleviated, and the A direction and the B direction shown in FIG. Even in the case of bending while rotating dimensionally, the working efficiency of the connection work between the U-shaped groove 2 and the universal joint 3 is improved.

  Moreover, the notch groove M1 of the universal joint 3 according to the first embodiment is formed on the inner side of the top portion that protrudes to the outermost side of the flange 33 as shown in FIG. It is formed on the outer side of the bottom part which entered the innermost part in between. For this reason, even when the ridge 33 and the ridge 33 are narrower and wider than the shape when the rubber plate 30 is molded, the repulsive force of the rubber elastic body can be reduced.

  In addition, the notch groove M1 of the universal joint 3 according to the first embodiment is formed on the inner surface and the outer surface at positions outside the curvature radius of the curved surface of the bellows-like portion 31. For this reason, in particular, the repulsive force of the rubber elastic body when the bellows-like portion 31 is folded can be reduced.

  In addition, although the linear thing was illustrated as notch groove | channel M1, M2, if the pattern of fixed shapes, such as a broken line and a waveform, is repeated like a tread pattern of a tire, it will be a non-linear arc-shaped groove | channel It does not matter. Even in such a case, it is clear that the above-described effects can be achieved. However, it is preferable that the notched grooves M1 and M2 are linear because the notched grooves can be easily formed by extrusion molding or cutting.

  Moreover, although the case where the notch groove M1 and the notch groove M2 are orthogonal to each other along the flange 33 is illustrated, if one of or both of them are in a relationship intersecting with each other, the torsional stress of the rubber elastic body Clearly, the repulsive force can be mitigated. However, when the notch groove M1 and the notch groove M2 are orthogonal to each other, any torsional stress acts on the universal joint 3 to efficiently relieve the repulsive force. Can do.

  In short, according to the universal joint 3 according to the first embodiment, the notched grooves M1 and M2 are provided even when a hard rubber such as chloroprene rubber (CR rubber) is used as the rubber elastic body in consideration of durability. Thereby, the flexibility of the bellows-like part 31 can be improved, and the working efficiency of the connection / installation work of the grooved connector 1 can be improved.

  Note that, as described in the background art, as a means for improving the flexibility of the universal joint, it is generally considered to increase the number of wrinkles of the bellows-like portion (the bellows-like portion 31). However, in that case, the linear member (U-shaped groove 2) of the groove-rod connection body is cheaper in unit price per length than the joint member (universal joint 3), and the distance between the bellows-shaped portions is increased by increasing the number of hooks. If the length is increased, the manufacturing cost and the installation (construction) cost will increase.

  In addition, as other means for improving the flexibility of the universal joint, it is conceivable to reduce the hardness of the rubber elastic body (soften) or to reduce the thickness of the rubber plate. This is undesirable because it tends to be damaged and the durability is reduced. Further, the formability of the universal joint is deteriorated, the transport efficiency of the universal joint is deteriorated, and the work efficiency of the connecting operation between the U-shaped groove and the universal joint is also deteriorated.

  On the other hand, according to the universal joint 3 which concerns on 1st Embodiment, it can be set as the universal joint 3 with sufficient thickness with respect to abrasion with the function of the notch groove M1 and the notch groove M2. Further, even if the bellows-like portion 31 is shortened as much as possible, the U-shaped groove 2 and the U-shaped groove 2 of the grooved rod connecting body 1 can be easily connected at an arbitrary angle without deteriorating the formability of the universal joint 3. It is possible to reduce the manufacturing cost and installation (construction) cost of the entire grooved connector.

[Second Embodiment]
Next, the notch groove of the universal joint 6 which concerns on 2nd Embodiment of this invention is demonstrated using FIGS. The difference from the universal joint 3 according to the first embodiment described above is that the rubber plate formed as the universal joint 6 is provided with notched grooves M1 and M2 only on the inner surface (inner side) of the universal joint. Since only this point is 60, this point will be mainly described, and the same components are denoted by the same reference numerals, and description thereof will be omitted.

  Notch grooves M1 of the rubber plate 60 formed as the universal joint 6 according to the second embodiment are all formed on the inner surface (inner side) of the flange 33 as shown in FIG. The notch groove M1 of the universal joint 6 is formed on the inner side of the top portion that protrudes to the outermost side of the flange 33 as in the case of the universal joint 3, and is different from the universal joint 3 between the flange 33 and the flange 33. It is formed inside the bottom that penetrates the innermost part. Even in this case, as in the case of the universal joint 3, the repulsive force of the rubber elastic body is alleviated when the flange 33 and the flange 33 are narrower and wider than the shape when the rubber plate 60 is molded. Can do.

  The notch groove M2 of the universal joint 6 according to the second embodiment has the same configuration as the universal joint 3 in terms of shape, formation position, and the like. For this reason, the expansion / contraction function with respect to torsion of the bellows-like portion 31 is improved, the restoring force of torsion of the universal joint 3 made of a rubber elastic body is alleviated, and the A direction and the B direction shown in FIG. Even in the case of bending while rotating dimensionally, the working efficiency of the connection work between the U-shaped groove 2 and the universal joint 6 is improved.

  According to the universal joint 6 according to the second embodiment, since the notched grooves M1 and M2 are provided only on the inner surface of the universal joint 6, the notched groove M1 is formed by processing and molding only one surface of the rubber plate 60. M2 can be produced, the production cost of the mold can be reduced, the processing time can be shortened, and the production cost of the universal joint 6 can be reduced.

[Third Embodiment]
Next, the notch groove of the universal joint 7 which concerns on 3rd Embodiment of this invention is demonstrated using FIGS. 15-17. The difference from the universal joint 3 according to the first embodiment described above is that the rubber plate formed as the universal joint 7 is a rubber plate 70 in which notched grooves M1 and M2 are provided only on the outer surface of the universal joint. Therefore, this point is mainly described, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  The cutout grooves M1 of the rubber plate 70 formed as the universal joint 7 according to the third embodiment are all formed on the outer surface (outer side) of the flange 33 as shown in FIG. Unlike the universal joint 3, the notch groove M 1 of the universal joint 7 is formed on the outer side (outer surface) of the top portion of the flange 33 that protrudes to the outermost side. It is formed in the outer side (outer surface) of the bottom part which entered the innermost part between 33. Even in this case, as in the case of the universal joint 3, the repulsive force of the rubber elastic body is alleviated when the flange 33 and the flange 33 are narrower and wider than the shape when the rubber plate 70 is molded. Can do.

  The notch groove M2 of the rubber plate 70 is a groove having an arcuate cross section for improving the expansion and contraction function against torsion acting on the bellows-like portion 31, and is formed on the outer surface (outside) of the bellows-like portion 31 in the X direction. It is formed linearly along. For this reason, the expansion / contraction function with respect to torsion of the bellows-like portion 31 is improved, the restoring force of torsion of the universal joint 7 made of a rubber elastic body is alleviated, and the A direction and the B direction shown in FIG. Even in the case of bending while rotating dimensionally, the work efficiency of the connection work between the U-shaped groove 2 and the universal joint 7 is improved.

  According to the universal joint 7 according to the third embodiment, since the notched grooves M1 and M2 are provided only on the outer surface (outer side) of the universal joint 7, the production cost of the universal joint 7 is the same as that of the universal joint 6. In addition, the notch grooves M1, M2 are less likely to be worn or damaged by gravel or the like that is caused by water flow, and the durability of the universal joint 7 is improved.

[Fourth Embodiment]
Next, the notch groove of the universal joint 8 which concerns on 4th Embodiment of this invention is demonstrated using FIGS. 18-20. The only difference from the universal joint 6 according to the second embodiment described above is that the number of notch grooves M1 is reduced, so that this point will be mainly described and the same configuration will be described. The same reference numerals are given and the description is omitted.

  Notch grooves M1 of the rubber plate 80 formed as the universal joint 8 according to the fourth embodiment are all formed on the inner surface (inner side) of the flange 33, as with the universal joint 6. That is, the notch groove M1 of the universal joint 8 is formed on the inner side of the top portion that protrudes to the outermost side of the flange 33, as in the universal joint 6, and the bottom portion that enters the innermost side between the flange 33 and the flange 33. Is formed inside. However, unlike the universal joint 6, the cutout groove M <b> 1 of the universal joint 8 has fewer cutout grooves at positions excluding the inside of the top and bottom of the flange 33 as shown in the figure. Further, the notch groove M2 of the universal joint 8 has the same configuration as the universal joints 3 and 6 in terms of shape, formation position and the like.

  According to the universal joint 8 according to the fourth embodiment, since the number of the notch grooves M1 is smaller than that of the universal joint 6 described above, the production cost of the universal joint 8 can be reduced compared to the universal joint 6. it can.

  As described above, the grooved rod connector 1 according to the embodiment of the present invention and the universal joints 3, 6, 7, and 8 thereof have been described in detail. However, any of the above-described or illustrated embodiments implements the present invention. However, the technical scope of the present invention should not be construed in a limited manner. In particular, the depth and number (number) of notches in the universal joint may be appropriately determined according to the hardness, thickness, etc. of the rubber plate constituting the universal joint. It is clear that the effects of the above are achieved.

1: Groove-rod connector 2: U-shaped groove (linear member)
20: U-shaped groove main body 21: collar part 3, 6, 7, 8: universal joint 30: rubber plate 31: bellows-like part 32: connection part 33, 34: collar 4: U-shaped metal fitting 5: waterproofing material M1: Notch groove (bending stress groove)
M2: Notched groove (groove for torsional stress)

Claims (7)

It is a universal joint of a grooved rod connection body used in a bent portion of a grooved rod connection body that is laid while being fitted and connected to a ground groove,
It has a bellows-like portion of a rubber elastic body formed in a corrugated shape, and a notch groove is formed in the inner layer and / or the outer surface of the bellows-like portion ,
The notch groove has a groove along the longitudinal direction of the groove-rod connecting body that intersects the direction along the flange of the bellows-like portion . The universal joint of the groove-linked body according to claim 1, wherein the notch groove is formed in a straight line. 3. The universal joint for a grooved rod connection body according to claim 1, wherein the notch groove is formed on an inner surface or an outer surface near a top portion and a bottom portion of the flange of the bellows-shaped portion. The said notch groove is formed in multiple numbers along the collar of the said bellows-like part. The universal joint of the groove-rod coupling body in any one of Claim 1 thru | or 3 characterized by the above-mentioned. 5. The universal joint for a grooved rod connection body according to claim 1, wherein a plurality of the notched grooves are formed along two directions intersecting each other. The universal joint for a grooved rod connector according to claim 5, wherein the two directions are orthogonal to each other. A grooved joint assembly comprising the universal joint of the grooved joint assembly according to any one of claims 1 to 6.

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