Attachment to the waterway

Abstract

The present invention provides a mounting body that can be suitably attached even if the cylindrical waterway is deformed or sloped. [Solution] The mounting body 10 is used to be attached to a cylindrical waterway and is attachable by being inserted into the waterway from the front end. It comprises a hollow cylindrical portion 20 whose axial direction is the direction in which it is attached to the waterway, and an annular elastic member attached to the outer surface of the cylindrical portion 20. The cylindrical portion 20 is provided with a movement-restricting portion 28 that restricts the axial movement of the elastic member, and a plurality of cutting-assist portions 21 to 26 that extend from the front end to the other end of the cylindrical portion 20 and are groove-shaped and recessed toward the central axis. The depth of the grooves of the cutting-assist portions 21 to 26 and the movement-restricting portion 28 are equal, and the cutting-assist portions 21 to 26 are provided to the rear end beyond the movement-restricting portion 28.

Description

Technical Field

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[0001] The present invention relates to an attachment body that is provided in a paddy field or the like and is attached to a cylindrical waterway for use.

Background Art

[0002] Conventionally, cylindrical waterways for draining water have been provided in paddy fields or the like. Until an appropriate water level is reached, drainage from the waterway is suppressed and water is stored in the paddy field or the like. When the appropriate water level is exceeded, drainage is carried out from the waterway.

[0003] As a device for preferably storing and draining water into a paddy field or the like, there is a paddy field drainage system described in Patent Document 1. The paddy field drainage system described in Patent Document 1 includes a drain pipe portion and a drain joint member, and is provided at a ridge portion at the boundary between the paddy field portion and the waterway portion. The drain pipe portion penetrates through the ridge portion, and one end portion opens in the waterway portion. Further, the other end portion of the drain pipe portion is located on the paddy field side, and a drain joint member is attached to the other end portion. The drain joint member includes a second inlet portion that opens upward, enabling water storage until the water level of the paddy field reaches the height of the second inlet portion, and allowing drainage through the second inlet portion when the water level of the paddy field becomes higher than the second inlet portion.

Prior Art Documents

Patent Documents

[0004] [

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When using the drain pipe section and drain joint member described in Patent Document 1, the end of the drain pipe section may deform due to soil pressure. Also, when installing it at an angle to the wall surface of a drain outlet basin installed in a paddy field, the shape of the drain pipe section with respect to the installation direction may not be circular. In these cases, because the shape of the drain joint member and the shape of the end of the drain pipe section are different, it may become difficult to insert the drain joint member into the drain pipe section.

[0006] The present invention was made to solve the above problems, and its main objective is to provide a mounting body that can be suitably attached even if the cylindrical waterway is deformed or inclined. [Means for solving the problem]

[0007] The first configuration is an attachment body used to be attached to a cylindrical waterway, and is attachable by being inserted into the waterway from the front end, comprising a hollow cylindrical portion whose direction of attachment to the waterway is axial, and an annular elastic member attached to the outer surface of the cylindrical portion, wherein the cylindrical portion comprises a movement-restricting portion that restricts the movement of the elastic member in the axial direction, and a cutting-assist portion that extends from the front end to the other end of the cylindrical portion and is groove-shaped or thinner than the surrounding area and recessed toward the central axis.

[0008] In the first configuration, the cylindrical portion becomes more flexible toward the central axis by using the cutting aid to make an incision in the cylindrical portion. Therefore, if the waterway is deformed or inclined relative to the direction in which the attachment is attached, the shape of the cylindrical portion of the attachment can be made to conform to the shape of the waterway.

[0009] The second configuration, in addition to the first configuration, has multiple cutting assist units provided in the circumferential direction of the cylindrical portion.

[0010] In the second configuration, when making cuts in the cylindrical section using the cutting aids, the number of cutting aids used for cutting can be selected. That is, if a larger deformation of the cylindrical section is required, more cutting aids can be used for cutting, and if a smaller deformation of the cylindrical section is acceptable, fewer cutting aids can be used for cutting. Therefore, the shape of the cylindrical section can be made more suitable for the shape of the waterway to which it is attached.

[0011] The third configuration, in addition to the second configuration, is such that the cutting assist portion is thinner than the surrounding area, and thicker cutting restricting portions are provided at both circumferential ends of the cutting assist portion and / or at the other end of the cutting assist portion.

[0012] When using the cutting aid to create a cut, there is a possibility of making the cut too long or too wide. In this case, the deformation of the cylindrical section will be excessive, and the cylindrical section may easily come out of the waterway. In this respect, the third configuration provides a cutting restriction section, which can suppress the formation of an excessive cut.

[0013] The fourth configuration, in addition to the first configuration, is that the cutting assist portion and the movement restraining portion are grooves recessed toward the central axis of the cylindrical portion, and the depth of the groove toward the central axis is equal.

[0014] Depending on the shape of the movement-restricting part, the movement-restricting part may hinder the cutting process when making an incision in the cutting aid part. In this regard, with the fourth configuration, even when using the cutting aid part to make an incision leading to the movement-restricting part, the movement-restricting part does not hinder the cutting process, and an incision can be made smoothly.

[0015] The fifth configuration, in addition to the first configuration, includes a cutting assist section that extends further to the rear end than the movement restraining section.

[0016] In the fifth configuration, since a cut can be made up to the rear end side of the movement suppression part, the amount of deformation of the cylindrical part at the position where the elastic member is attached can be increased, and the followability of the cylindrical part to the shape of the water channel can be improved.

[0017] The sixth configuration is that, in addition to any one of the first to fifth configurations, the elastic member can change the width protruding outward from the cylindrical part.

[0018] Although the elastic member elastically deforms when inserted into the water channel, depending on the shape of the water channel, even if deformation of the cylindrical part and the elastic member occurs, insertion may be difficult. Also, if the inner diameter of the water channel is slightly larger than the outer diameter of the cylindrical part, the size of the elastic member may be excessive. In this regard, in the sixth configuration, by changing the width of the elastic member, the shape of the entire cylindrical part to which the elastic member is attached can be made to follow the shape of the water channel.

[0019] The seventh configuration is that, in addition to the sixth configuration, a cut groove part with a reduced thickness is formed at an intermediate position in the radial direction of the elastic member.

[0020] In the seventh configuration, by using the cut groove part, the width by which the elastic member protrudes from the cylindrical part can be suitably changed.

Brief Description of the Drawings

[0021] [Figure 1] It is a perspective view of the attachment body. [Figure 2] It is a front view of the attachment body. [Figure 3] It is a rear view of the attachment body. [Figure 4] It is a left side view of the attachment body. [Figure 5] It is a plan view of the attachment body. [Figure 6] It is a bottom view of the attachment body. [Figure 7] It is a cross-sectional view taken along line A-A. [Figure 8] It is a cross-sectional view taken along line B-B. [Figure 9]This is a front view of the packing. [Figure 10] This is a side view of the packing. [Figure 11] This is a cross-sectional view of the CC line. [Figure 12] This is an enlarged view of Figure 11. [Figure 13] This is a front view of the mounting body with the packing attached. [Figure 14] This is a left side view of the mounting body with the packing attached. [Figure 15] This is a perspective view of a pouring masu (wooden measuring cup). [Figure 16] This is a side view of the drainage box. [Figure 17] This is a plan view of the drainage box. [Figure 18] This is a cross-sectional view of the drain box with the attachment body installed. [Modes for carrying out the invention]

[0022] As shown in Figure 18, the flow path forming member 10 according to this embodiment is used by being attached to the outlet basin 100 provided in the irrigation channel of a paddy field. In the following description, the top and bottom direction is defined as the up and down direction, the side of the irrigation channel opposite the paddy field side is defined as the front direction, and the width direction of the irrigation channel is defined as the left and right direction.

[0023] First, the structure of the drain basin 100 will be explained with reference to Figure 15-17. This drain basin 100 is integrally molded from concrete. The drain basin 100 is equipped with a bottom plate 101, which is a roughly square flat plate extending in the front-to-back direction. On the left and right ends of this bottom plate 101, there are opposing rectangular plate-shaped side walls 102 and 103 that are erected upward and have a roughly uniform thickness in the left-to-right direction. On the inner surfaces of these side walls 102 and 103, there are opposing positions where side wall grooves 104 and 105 are provided, which are grooves that extend in the vertical direction and are recessed toward the outer surface.

[0024] At the front ends of the base plate 101 and side walls 102 and 103, a flat front wall 106 is provided, extending upward and having a uniform thickness in the front-to-back direction. Near the lower end of this front wall 106, a circular hole is formed that penetrates in the front-to-back direction, and a cylindrical water channel 107 extending forward is inserted into this hole. The center of the circular hole coincides approximately with the left-to-right center of the front wall 106, and the diameter of the circular hole is approximately half the width of the rear wall 106. The cylindrical water channel 107 is made of a hard synthetic resin or the like, and its outer diameter is approximately equal to the inner diameter of the circular hole.

[0025] Next, the attachment body 10 according to this embodiment will be described with reference to Figure 1-8. The attachment body 10 is made of a hard material, which is, for example, synthetic resin. The attachment body 10 has a cylindrical tube portion 20 with the front-to-back direction as its central axis and both front and rear end edges open. The outer circumferential surface of the tube portion 20 is provided with grooves 21 to 26 that extend from the front end edge toward the rear, are recessed toward the central axis of the tube portion 20, and have a constant shape in the front-to-back direction. There are six of these grooves 21 to 26, spaced equally in the circumferential direction. In the following description, they will be referred to as the 1st to 6th grooves 21 to 26, starting from the one located in the upper right when viewed from the front, and proceeding clockwise.

[0026] The lengths of the first to sixth grooves 21 to 26 are equal in the front-to-back direction, and their rear ends are positioned so as not to reach the rear end of the cylindrical portion 20. The depth of the first to sixth grooves 21 to 26 toward the central axis is equal, and the bottom surfaces of each groove are located on a common virtual circle centered on the central axis of the cylindrical portion 20, and are in a slightly curved arc shape. The lengths of the bottom surfaces of the first to sixth grooves 21 to 26 are equal and uniform in the front-to-back direction. The circumferential center of the bottom surface of the first groove 21, located on the upper right side, is inclined 30 degrees to the right of the central axis, and the centers of the bottom surfaces of the second to sixth grooves 22 to 26 are offset by 60 degrees each. That is, the circumferential centers of the bottom surfaces of the second groove 22 and the fifth groove 25 are located on a virtual plane that passes through the center of the cylindrical portion 20 and extends horizontally in the left-to-right direction.

[0027] The left side of the first groove 21 is a vertical surface that stands perpendicular to the bottom surface, and the right side of the first groove 21 is an inclined surface with an angle of approximately 120 degrees to the bottom surface. The upper sides of the second groove 22 and the fifth groove 25 are horizontal surfaces that are horizontal to the left and right directions, and the lower sides are also horizontal surfaces that are horizontal to the left and right directions. The left side of the third groove 23 is a vertical surface that stands perpendicular to the bottom surface, and the right side of the third groove 23 is an inclined surface with an angle of approximately 120 degrees to the bottom surface. The right side of the fourth groove 24 is a vertical surface that stands perpendicular to the bottom surface, and the left side of the fourth groove 24 is an inclined surface with an angle of approximately 120 degrees to the bottom surface. The right side of the sixth groove 26 is a vertical surface that stands perpendicular to the bottom surface, and the left side of the sixth groove 26 is an inclined surface with an angle of approximately 120 degrees to the bottom surface. The rear ends of these first to sixth grooves 26 are vertical surfaces located on a virtual plane perpendicular to the central axis. Furthermore, if the surfaces between each of the first to sixth grooves 21 to 26 are referred to as the outer peripheral surfaces 27, then it can be said that convex portions protrude from between each bottom surface, with the outer peripheral surfaces 27 as their apex. The circumferential width of the bottom surfaces of the first to sixth grooves 21 to 26 is approximately 1 / 5 of the circumferential width of the outer peripheral surfaces 27.

[0028] As described above, the radial thickness of the bottom surface of the 1st to 6th grooves 21 to 26, the radial thickness of the outer peripheral surface 27, the thickness of each vertical surface of the 1st, 3rd, 4th, and 6th grooves 21, 23, 24, and 26 in the direction perpendicular to the vertical surface, the thickness of each inclined surface of the 1st, 3rd, 4th, and 6th grooves 21, 23, 24, and 26 in the direction perpendicular to the inclined surface, the thickness of each horizontal surface of the 2nd and 5th grooves 22, and 25 in the direction perpendicular to the horizontal plane, and the thickness of the back end of the 1st to 6th grooves 21 to 26 in the direction perpendicular to the vertical surface are all equal and uniform. In other words, the radial thickness of the vertical surfaces of the 1st, 3rd, 4th, and 6th grooves 21, 23, 24, and 26, the radial thickness of the inclined surfaces of the 1st, 3rd, 4th, and 6th grooves 21, 23, 24, and 26, the radial thickness of the horizontal surfaces of the 2nd and 5th grooves 22 and 25, and the radial thickness of the vertical surfaces at the back ends of the 1st to 6th grooves 21 to 26 are thicker than the radial thickness of the bottom surfaces of the 1st to 6th grooves 21 to 26 and the radial thickness of the outer circumferential surface 27, indicating that they are formed with greater thickness.

[0029] The first to sixth grooves 21 to 26, which are configured as described above, have been explained as being concave from the outer circumference towards the central axis. However, when viewed from the central axis, it can also be said that the inner surfaces of the first to sixth grooves 21 to 26 protrude from the inner circumference towards the central axis. In this case, the inner surface of the outer surface 27 can be said to be concave from the central axis towards the outer circumference.

[0030] In addition to the first to sixth grooves 21 to 26 described above, an outer peripheral groove 28, which is an annular groove that encircles the outer circumference of the cylindrical portion 20, is provided on the outer circumference of the cylindrical portion 20. This outer peripheral groove 28 is provided in front of the rear ends of the first to sixth grooves 21 to 26. The radial depth of the outer peripheral groove 28 is uniform throughout its circumference and is equal to the radial depth of the first to sixth grooves 21 to 26. Furthermore, the front-to-back width of the outer peripheral groove 28 is uniform throughout its circumference, and its front and rear surfaces are located on a virtual plane perpendicular to the central axis of the cylindrical portion 20. At the location where this outer peripheral groove 28 is provided, the vertical surface, inclined surface, horizontal surface, and outer peripheral surface 27 of the first to sixth grooves 21 to 26 are divided in the front-to-back direction. Furthermore, since the radial depth of the outer periphery groove 28 is equal to the radial depth of the first to sixth grooves 21 to 26, the bottom surface of the outer periphery groove 28 and the bottom surfaces of the first to sixth grooves 21 to 26 form a continuous curved surface.

[0031] At the rear end of the cylindrical section 20, there is a vertical cylindrical section 30 that extends vertically and has a rounded rectangular cross-section. The vertical cylindrical section 30 is wider in the left-right direction than in the front-to-back direction, and its left-right width is smaller than the distance between the side walls 102 and 103 of the outlet basin 100. Also, its height in the vertical direction is greater than its width in the left-to-right direction. Furthermore, the front surface near the upper end of the vertical cylindrical section 30 bulges slightly forward. The upper end of this vertical cylindrical section 30 is open, and this open upper end is referred to as the upper inlet 31. The lower end of the vertical cylindrical section 30 is closed and has a semicircular shape that bulges downward when viewed from the front. Near the lower end of the rear of this vertical cylindrical section 30, there is a downward inlet 32, which is a circular hole that penetrates vertically. The flow path cross-sectional area of ​​this downward inlet 32 ​​is smaller than the flow path cross-sectional area of ​​the upper inlet 31. The sum of the flow path cross-sectional area of ​​the lower inlet 32 ​​and the flow path cross-sectional area of ​​the upper inlet 31 is less than or equal to the flow path cross-sectional area of ​​the cylindrical section 20. The rear end of the cylindrical section 20 is connected to the front of the vertical cylindrical section 30, and the interior of the cylindrical section 20 and the interior of the vertical cylindrical section 30 form a continuous space.

[0032] Next, the packing 40, which is fitted into the outer circumferential groove 28 of the cylindrical portion 20, will be described with reference to Figure 9-12. The packing 40 is an annular elastic member, and its material is, for example, synthetic rubber or silicone rubber. The packing 40 has a cylindrical inner ring portion 41. The inner diameter of this inner ring portion 41 is approximately equal to the outer diameter of the bottom surface of the outer circumferential groove 28, the outer diameter of the inner ring portion 41 is slightly smaller than the outer diameter of the cylindrical portion 20, and the front-to-back width of the inner ring portion 41 is slightly smaller than the front-to-back width of the outer circumferential groove 28. A pair of flange portions 42 that protrude radially outward are provided on the outer circumferential surface of this inner ring portion 41. The cross-sectional shape of these flange portions 42 in the circumferential direction is uniform, and the front-to-back width of the flange portions 42 becomes thinner towards the outside. A cutting groove 43 that narrows the thickness of the flange portion 42 is provided approximately in the radial center of each flange portion 42. These cutting grooves 43 are provided on both the front and rear surfaces of the flange portion 42 around its entire circumference. The radial position of each cutting groove 43 is uniform around the entire circumference, and the grooves do not reach the center of the flange portion 42 in the front-to-back direction. The radial width gradually narrows as it approaches the center of the flange portion 42 in the front-to-back direction.

[0033] As described above, the packing 40 is fitted into the outer circumferential groove 28 of the cylindrical portion 20. Figures 13 and 14 show the state in which the packing 40 is fitted into the outer circumferential groove 28 of the cylindrical portion 20. Since the packing 40 is made of an elastic material, it can be fitted into the outer circumferential groove 28 by expanding the diameter of the packing 40 and fitting it onto the cylindrical portion 20. At this time, the movement of the packing 40 in the front-rear direction is suppressed by the outer circumferential groove 28, so the outer circumferential groove can be called a movement-restricting part.

[0034] The process of attaching the mounting body 10 described above to the outlet basin 100 will be explained with reference to Figure 18. The mounting body 10 is attached by inserting the cylindrical portion 20 into the water channel 107 from the inside of the outlet basin 100. At this time, the packing 40 attached to the cylindrical portion 20 elastically deforms and comes into contact with the inner surface of the water channel 107, increasing the frictional force and making it difficult for the mounting body 10 to come off the outlet basin 100. In addition, a plate-shaped water-stopping plate 110 is inserted from above and attached to the side wall grooves 104 and 105. The height of this water-stopping plate 110 is selected to be approximately equal to the water level required for the paddy field when attached to the outlet basin 100.

[0035] When the attachment body 10 is attached to the outlet basin 100 and water is stored in the paddy field, if the water level exceeds the height of the water-stopping plate 110, water will flow into the outlet basin 100 from above the water-stopping plate 110. At this time, the water that has flowed into the outlet basin 100 will flow into the cylindrical section 20 from the lower inlet 32 ​​provided on the attachment body 10 and will be drained into the waterway 107 from the front end of the cylindrical section 20. In addition, during rainfall, the water level in the paddy field may rise rapidly, and the amount of drainage via the lower inlet 32 ​​may not be able to keep up with the rise in water level. In this case, if the water level reaches the upper inlet 31 of the vertical cylindrical section 30, water will be drained from the upper inlet 31 in addition to the lower inlet 32, increasing the amount of drainage per hour and suppressing the rise in water level. The height of the vertical cylindrical section 30 can be adjusted as needed by cutting it. For example, if the mounting body 10 is attached to the drain basin 100 and the position of the upper inlet 31 is excessively high relative to the expected water level, the vertical cylindrical section 30 can be cut to lower the position of the upper inlet 31.

[0036] When the mounting body 10 is attached to the outlet basin 100 in this manner, if the water channel 107 is deformed due to soil pressure, if the entire outlet basin 100 is tilted, or if the water channel 107 is inserted into the circular hole of the outlet basin 100 in a distorted manner, the shape of the water channel 107 as viewed from the mounting direction (front-to-back direction) may not be circular. In this case, notches can be made along the first to sixth grooves 21 to 26 using scissors or nippers to deform the shape of the cylindrical part 20. When making notches along the first to sixth grooves 21 to 26, the position of the notches, the width of the notches in the circumferential direction, and the length of the notches in the front-to-back direction (mounting direction) can be changed to make the shape of the water channel 107 as viewed from the mounting direction (front-to-back direction) suitable. Furthermore, when making the cuts, the width of the bottom surface of the first to sixth grooves 21 to 26 is about 1 / 5 of the width of the outer surface 27. Therefore, even if it is not possible to make a cut of sufficient length in one operation when making the cuts with nippers, it is possible to cut further from the tip of the cut. The specific method of making these cuts will be explained below. Note that the first to sixth grooves 21 to 26 can be called cutting aids because they are the parts used when making the cuts.

[0037] If the outlet basin 100 is tilted in the front-to-back direction, or if the vertical width of the waterway 107 is deformed due to soil pressure, or if the waterway 107 is inserted into the circular hole of the outlet basin 100 in a distorted manner so as to be tilted vertically, the shape of the waterway 107 when viewed from the mounting direction (front-to-back direction) will be, for example, an ellipse with the left-to-right direction as its major axis. In this case, it becomes necessary to make the shape of the cylindrical part 20 closer to an ellipse with the left-to-right direction as its major axis, so cuts are made using the second groove 22 and the fifth groove 25. By doing so, the vertical width of the second groove 22 and the fifth groove 25 can be narrowed, so the vertical width of the cylindrical part 20 can be narrowed to make it closer to an ellipse with the left-to-right direction as its major axis.

[0038] On the other hand, if the outlet basin 100 is tilted in the left-right direction, or if the width of the waterway 107 in the left-right direction is deformed due to soil pressure, or if the waterway 107 is inserted into the circular hole of the outlet basin 100 in a distorted manner so as to be tilted in the left-right direction, the shape of the waterway 107 when viewed from the mounting direction (front-back direction) will be, for example, an ellipse with the vertical direction as its major axis. In this case, it becomes necessary to make the shape of the cylindrical part 20 closer to an ellipse with the left-right direction as its major axis, so cuts are made using the first groove 21, the third groove 23, the fourth groove 24, and the sixth groove 26. By doing so, the circumferential width of the first groove 21, the third groove 23, the fourth groove 24, and the sixth groove 26 can be narrowed, so the width of the cylindrical part 20 in the left-right direction can be narrowed to make it closer to an ellipse with the vertical direction as its major axis.

[0039] In addition, if notches are provided in the first groove 21, third groove 23, fourth groove 24, and sixth groove 26, the cylindrical portion 20 can be deformed not only in the left-right direction but also in the up-down direction. Therefore, if it becomes necessary to narrow the width of the cylindrical portion 20 in the up-down direction, notches may be provided in the first groove 21, third groove 23, fourth groove 24, and sixth groove 26 in addition to notches in the second groove 22 and fifth groove 25, or notches may be provided in the first groove 21, third groove 23, fourth groove 24, and sixth groove 26 instead of notches in the second groove 22 and fifth groove 25.

[0040] As described above, when making cuts in the grooves 21-26 to deform the cylindrical portion 20, the circumferential width and front-to-back length of the cuts can be appropriately adjusted according to the shape as viewed from the mounting direction of the waterway 107. The greater the flattening ratio of the shape as viewed from the mounting direction of the waterway 107, the greater the need to deform the shape of the cylindrical portion 20 as seen from the front. In this case, the greater the circumferential width of the cuts in each groove 21-26, the greater the amount of deformation of the cylindrical portion 20, and the greater the front-to-back length of the cuts in each groove 21-26, the greater the amount of deformation of the front end of the cylindrical portion 20.

[0041] In this way, when making cuts in the first to sixth grooves 21 to 26, the vertical and inclined surfaces that are the circumferential end faces of the first, third, fourth, and sixth grooves 21, 23, 24, and 26, the horizontal surfaces that are the end faces of the second and fifth grooves 22, and 25, and the vertical surfaces at the back ends of the first to sixth grooves 21 to 26 have a greater radial thickness than their respective bottom surfaces. Therefore, when scissors or nippers are inserted to make a cut, if the scissors or nippers reach the respective vertical surfaces, inclined surfaces, or horizontal surfaces, it becomes difficult to cut any further, thus preventing over-cutting. For this reason, each of the vertical surfaces, inclined surfaces, and horizontal surfaces can be referred to as a cutting restriction section.

[0042] Furthermore, if the water channel 107 is flattened, in addition to making cuts into the grooves 21-26, the radial width of the flange portion 42 of the packing 40 may be changed. In this case, the diameter of the packing 40 can be changed by using the cutting groove 43 provided in the flange portion 42 of the packing 40 to cut off the outer edge of the flange portion 42. At this time, the outer edge of the flange portion 42 may be cut all the way around using a tool along the cutting groove 43, or the outer diameter of the flange portion 42 may be made into a roughly elliptical shape by cutting off the outer edge of the flange portion 42 along only a part of the cutting groove 43. Moreover, since the packing 40 is made of an elastic material, the area of ​​the flange portion 42 where the cutting groove 43 is provided has lower strength than the surrounding area. Therefore, if a cut is made from the outer edge to the cutting groove 43 using a tool, and then the outer circumference side of the cutting groove 43 is pulled, the entire circumference of the flange portion 42 can be torn along the cutting groove 43.

[0043] With the above configuration, the attachment body 10 according to this embodiment provides the following effects.

[0044] By using grooves 21-26 as cutting aids to make cuts in the cylindrical portion 20, the cylindrical portion 20 becomes more flexible toward the central axis. Therefore, if the waterway 107 is deformed or inclined relative to the direction in which the mounting body 10 is attached, the shape of the cylindrical portion 20 of the mounting body 10 can be made to conform to the shape of the waterway 107.

[0045] Since multiple grooves 21-26, which are cutting aids, are provided, it is possible to select which grooves 21-26 to cut into when making cuts in the cylindrical portion 20. That is, if a larger deformation of the cylindrical portion 20 is required, cuts should be made into more grooves 21-26, and if a smaller deformation of the cylindrical portion 20 is acceptable, the number of grooves 21-26 to cut should be reduced. Therefore, the shape of the cylindrical portion 20 can be made more suitable for the shape of the waterway 107 into which the cylindrical portion 20 is attached.

[0046] When creating a cut using grooves 21-26, there is a possibility of making the cut too long or too wide. In this case, the deformation of the cylindrical portion 20 will be excessive, and the cylindrical portion 20 may easily come out of the waterway. In this regard, the radial thickness of both circumferential edges and the longitudinal rear edge of grooves 21-26 is increased and used as a cutting restricting portion, which can suppress the formation of excessive cuts.

[0047] Since the radial depth of grooves 21-26 and the radial depth of the outer circumferential groove 28 are equal, when making a cut leading to the outer circumferential groove 28 using grooves 21-26, the outer circumferential groove 28 does not hinder the cutting process, allowing for a suitable cut.

[0048] Since the grooves 21-26 extend further to the rear end than the outer circumferential groove 28, it is possible to make cuts that extend further to the rear end than the outer circumferential groove 28 using the grooves 21-26. Therefore, the amount of deformation of the cylindrical portion 20 at the position where the packing 40 is attached can be increased, and the conformability of the cylindrical portion 20 to the shape of the waterway 107 can be improved.

[0049] - Although the packing 40 elastically deforms when inserted into the waterway 107, depending on the shape of the waterway 107, insertion may be difficult even if deformation occurs in the cylindrical portion 20 and the packing 40. Also, if the inner diameter of the waterway 107 is only slightly larger than the outer diameter of the cylindrical portion 20, the size of the packing 40 may be excessive. In this regard, since the width of the flange portion 42 of the packing 40 can be changed, the overall shape of the cylindrical portion 20 to which the packing 40 is attached can be made to conform to the shape of the waterway. In addition, since the packing 40 is provided with a cutting groove 43, the width to which the flange portion 42 of the packing 40 protrudes from the cylindrical portion 20 can be suitably changed.

[0050] - The circumferential width of the bottom surfaces of the 1st to 6th grooves 21 to 26 is set to about 1 / 5 of the circumferential width of the outer surface 27. Therefore, even if a cut of sufficient length cannot be made in a single operation, it is possible to cut further from the point where the cut was made. The ratio of the circumferential width of the bottom surfaces of the 1st to 6th grooves 21 to 26 to the circumferential width of the outer surface 27 can be arbitrarily set according to the outer diameter of the cylindrical section 20. However, if the width of the bottom surfaces of the 1st to 6th grooves 21 to 26 is made too wide, the strength when a cut is made will decrease, or the cross-sectional area of ​​the flow path of the cylindrical section 20 will decrease. Also, if the width of the bottom surfaces of the 1st to 6th grooves 21 to 26 is made too narrow, when making a cut with a short-bladed tool such as nippers, if a cut of sufficient length cannot be made in a single operation, it may be difficult to cut further from the point where the cut was made. Therefore, it is preferable that the circumferential width of the bottom surfaces of the first to sixth grooves 21 to 26 is about 1 / 10 to 1 / 3 of the circumferential width of the outer surface 27.

[0051] <Variation> In this embodiment, six grooves 21-26 are provided, but the number of grooves may be five or less, or seven or more. Providing multiple grooves in the cylindrical portion 20 allows the shape of the cylindrical portion 20 to be suitable for the shape of the waterway 107, but even with just one groove, it is possible to narrow the diameter of the cylindrical portion 20, thus achieving a certain effect.

[0052] In this embodiment, the circumferential widths of the bottom surfaces of grooves 21 to 26 are equal, but they may be different. For example, the circumferential widths of the bottom surfaces of grooves 21 to 26 may be different in the front-to-back direction.

[0053] In the embodiment, grooves 21-26 are provided to extend further back than the outer circumferential groove 28, but they may be limited to extending only to the outer circumferential groove 28. In this case as well, the cut can be made up to the rear end of the outer circumferential groove 28 by utilizing grooves 21-26 and the outer circumferential groove 28, so although the amount of deformation of the cylindrical portion 20 will be smaller than in the embodiment, it will still achieve effects similar to those of the embodiment. Alternatively, grooves 21-26 may be provided up to the rear end of the cylindrical portion 20. In this case, the cut can be made further to the rear end than in the embodiment, allowing for greater deformation of the cylindrical portion 20.

[0054] In this embodiment, the packing 40 is held by the outer peripheral groove 28, which functions as a movement-restricting part, thereby suppressing the movement of the packing 40 in the front-rear direction. However, the movement of the packing 40 in the front-rear direction may be suppressed by a structure different from the outer peripheral groove 28. For example, a pair of flanges or a plurality of protrusions facing each other in the front-rear direction may be provided on the outer peripheral surface of the cylindrical part 20 as movement-restricting parts, and the packing 40 may be held by these to suppress its movement in the front-rear direction.

[0055] In this embodiment, grooves 21-26, which function as cutting aids when making an incision in the cylindrical portion 20, are provided on the outer circumferential surface of the cylindrical portion 20. However, grooves that function as cutting aids may be provided on the inner circumferential surface of the cylindrical portion 20, and may have a shape that is recessed radially outward from the inner circumferential surface. In this case as well, the same effects as in the embodiment will be achieved, but if a configuration equivalent to the outer circumferential groove 28 that holds the packing 40 is provided, the inner circumferential surface side of the outer circumferential groove 28 may protrude into the inside of the cylindrical portion 20, potentially hindering the cutting process. In this regard, as described above, the packing 40 is held by a shape that protrudes from the outer circumferential surface of the cylindrical portion and functions as a movement-restricting part, and the movement-restricting part may be omitted only in the areas where a configuration equivalent to a cutting aid is provided.

[0056] In this embodiment, grooves 21-26 that function as cutting aids are provided in the cylindrical portion 20. However, a portion of the cylindrical portion 20 may be made thinner than the surrounding portion, and this thinner portion may function as a cutting aid. In this case, the area around the cutting aid is thicker than the cutting aid and is more difficult to cut than the cutting aid, so it can be called a cutting restricting portion.

[0057] In this embodiment, the cylindrical portion 20 is cylindrical in shape, but various shapes can be adopted for the cylindrical portion 20. Depending on the shape of the waterway to which it is installed, it may be rectangular, elliptical, or frustoconical in shape, which narrows towards one end.

[0058] In this embodiment, the shape of the vertical cylindrical portion 30 is approximately rectangular, but the shape of the vertical cylindrical portion 30 can be changed as appropriate depending on the application.

[0059] In this embodiment, the attachment body 10 is attached to a water channel 107 provided in a drainage basin 100 installed in a paddy field. However, the attachment target of the attachment body 10 is not limited to this, and it can be attached to various cylindrical water channels. In this case, the shape of the portion provided on the rear end side of the cylindrical part 20 can be appropriately changed depending on the purpose of use of the water channel to which the attachment body 10 is attached. For example, if the purpose is to close off a water channel using the cylindrical part 20, a lid that closes off the rear end of the cylindrical part 20 can be made detachable.

[0060] In this embodiment, the packing 40 has two flange portions 42, but it may have one or three or more. Also, although the radial widths of the two flange portions 42 are equal, flange portions 42 with different radial widths may be provided, and the flange portions 42 with a width suitable for the shape of the waterway 107 may be left while the other flange portions are removed, or the outer edge of the flange portion 42 that is wider than the flange portion 42 with a width suitable for the shape of the waterway 107 may be removed.

[0061] In this embodiment, a notch is provided in the cylindrical portion 20 to allow insertion when the waterway 107 to which the attachment body 10 is to be attached is deformed due to soil pressure or is inclined with respect to the direction in which the attachment body 10 is to be attached. However, the situations in which the cylindrical portion 20 is inserted into the waterway 107 after a notch is provided are not limited to this. For example, if the inside of the waterway 107 to which the attachment body 10 is to be attached has been repaired and there are raised objects due to the repair, the attachment body 10 can be attached to the waterway 107 by making a notch in the grooves 21 to 26 of the cylindrical portion 20 to reduce the outer diameter of the cylindrical portion 20. Also, even if the inner diameter of the waterway 107 to which the attachment body 10 was to be attached is smaller than expected, the cylindrical portion 20 can be inserted into the waterway 107 by making a notch in the grooves 21 to 26 of the cylindrical portion 20 or by reducing the width of the flange portion 42 of the packing 40. In other words, even if it becomes necessary to attach it to cylindrical waterways of different sizes, the attachment body 10 equipped with the cylindrical portion 20 according to the present invention can be attached.

[0062] Mounting body...10, cylindrical section...20, first groove...21, second groove...22, third groove...23, fourth groove...24, fifth groove...25, sixth groove...26, outer surface...27, outer groove...28, vertical cylindrical section...20, upper inlet...31, lower inlet...32, packing...40, inner ring...41, flange...42, cut groove...43, outlet basin...100, waterway...107, water stop plate...110

Claims

1. An attachment body used by being attached to a cylindrical waterway, A hollow cylindrical portion which can be inserted into the waterway from the front end and whose orientation is axial when attached to the waterway, The cylindrical portion comprises an annular elastic member attached to its outer circumferential surface, The cylindrical portion includes, A movement suppression unit that suppresses the movement of the elastic member in the axial direction, An attachment body comprising: a cutting assist portion that extends from the front end to the other end of the cylindrical portion and is groove-shaped or thinner than the surrounding area, recessed toward the central axis.

2. The attachment body according to claim 1, wherein the cutting assist portion is provided in multiple locations in the circumferential direction of the cylindrical portion.

3. The attachment body according to claim 2, wherein the cutting assist portion is thinner than the surrounding area, and a cutting restricting portion thicker than the cutting assist portion is provided at the other end of the cutting assist portion.

4. The attachment body according to claim 1, wherein the cutting assist portion and the movement restraining portion are grooves recessed toward the central axis of the cylindrical portion, and the depth of the groove toward the central axis is equal.

5. The attachment body according to claim 1, wherein the cutting assist portion is provided to extend further to the rear end than the movement restraining portion.

6. The attachment body according to any one of claims 1 to 5, wherein the width of the elastic member protruding outward from the cylindrical portion can be changed.

7. The attachment body according to claim 6, wherein a cutting groove with reduced thickness is formed at an intermediate position in the radial direction of the elastic member.

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