Attachment and attachment device

Abstract

To provide an attachment and an attachment device that can be attached to both of through-holes of two sizes.SOLUTION: An attachment 20 comprises a nipping mechanism that allows the attachment 20 to be attached to a side wall 13 of a resin underground embedded box 111 by nipping the side wall 13 with a front side member 21 and a back side member 31 from both sides in a wall thickness direction, while having a male screw 33 of a back-side body part 32 screwed in a female screw 23 of a front-side body part 22. The attachment 20 also comprises an adhesion mechanism that enables attachment of the attachment 20 to the side wall 13 of a concrete underground embedded box by adhering an outer peripheral surface of a front-side cylinder part 28 to a defined surface of a large through-hole.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an attachment and an attachment device. [Background technology]

[0002] The wiring and piping materials buried underground are inserted into a laying path buried underground. The laying path buried underground includes underground buried boxes buried at intervals and underground buried pipes connecting adjacent underground buried boxes.

[0003] Such underground burial boxes include those made of concrete and those made of resin for the purpose of weight reduction. In addition, the underground burial boxes are provided with through holes that penetrate the partition walls that define the internal space in the thickness direction. For example, Patent Document 1 discloses a drain hole for draining water that has entered the underground burial box as an example of the through hole.

[0004] Also, as disclosed in Patent Document 2, a check valve is attached as an attachment to the underground burial box using a drainage hole. The check valve disclosed in Patent Document 2 allows water to be drained from the inside of the underground burial box to the outside, while preventing water from entering the inside from the outside. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-186638 A [Patent Document 2] JP 2017-210969 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, depending on the material of the underground burial box, the thickness of the part where the through hole is formed varies, and the thickness of the part where the through hole is formed and the diameter of the through hole vary depending on the manufacturer. For this reason, for example, as in Patent Document 2, in order to attach the attachment using the through hole, it is necessary to prepare an attachment that matches the thickness of the part where the through hole is formed and an attachment that matches the diameter of the through hole. [Means for solving the problem]

[0007] Various aspects of the attachment for solving the above problems will now be described. [Aspect 1] The attachment body is attached to a demarcating body by using a through hole provided in the demarcating body, and includes a front side member arranged on a front side of the demarcating body in a thickness direction, and a back side member arranged on a back side of the demarcating body, at least one of the front side member and the back side member has a first insertion portion inserted into the through hole, and at least the other of the front side member and the back side member has a screw portion screwed to the first insertion portion, and the attachment body is sandwiched between the front side member and the back side member from both sides in the thickness direction while the first insertion portion and the screw portion are screwed together, an attachment body comprising a clamping mechanism that enables the attachment to be attached to the defined body, and at least one of the front side member and the back side member to which the first insertion portion and the screw portion are screwed together has a second insertion portion that can be inserted into the large through hole, and an adhesive mechanism that enables the attachment to be attached to the other defined body by adhering the outer surface of the second insertion portion to the defined surface of the large through hole, so that the attachment can be attached to the other defined body that is relatively thicker than the defined body and has a large through hole that is larger in the thickness direction than the through hole.

[0008] [Aspect 2] An attachment body is attached to a demarcating body by using a through hole provided in the demarcating body, the attachment body comprising a front side member arranged on a front side of the demarcating body in a thickness direction, and a back side member arranged on a back side of the demarcating body, at least one of the front side member and the back side member has a first insertion portion inserted into the through hole, and at least the other of the front side member and the back side member has a screw portion screwed to the first insertion portion, and the front side member and the back side member sandwich the demarcating body from both sides in the thickness direction while screwing the first insertion portion and the screw portion together, An attachment body characterized in that it has a clamping mechanism that enables the attachment body to be attached to the demarcation body, and in order to enable the attachment body to be attached to the other demarcation body that is a different demarcation body from the demarcation body and has a large through hole formed therein with a relatively larger internal space than the through hole, at least one of the front side member and the back side member to which the first insertion portion and the screw portion are screwed together has a second insertion portion that can be inserted into the large through hole, and has an adhesive mechanism that enables the attachment body to be attached to the other demarcation body by adhering the outer surface of the second insertion portion to the demarcation surface of the large through hole.

[0009] [Aspect 3] The second insertion portion is provided on either the front member or the rear member, and the other of the front member and the rear member has a shape different from the outer surface of the second insertion portion, and has an outer surface that cannot be adhered to the defining surface of the large through hole, or a shape that cannot be inserted into the large through hole.An attachment as described in [Aspect 1] or [Aspect 2].

[0010] [Aspect 4] An attachment body as described in any one of [Aspect 1] to [Aspect 3], wherein the length of the first insertion portion in the insertion direction into the through hole is longer than the length of the through hole in the insertion direction, a male thread is provided at the tip of the first insertion portion, the screw-attaching portion is hollow tubular with the second insertion portion on its outer periphery, and the screw-attaching portion has a female thread that screws into the male thread on the inside that overlaps with the second insertion portion in the axial direction of the screw-attaching portion.

[0011] [Aspect 5] An attachment body as described in any one of [Aspect 1] to [Aspect 4], wherein a flow passage is defined inside the attachment body to connect the front side and back side of the defining body when the first insertion portion and the screw portion are screwed together, and a check valve is disposed inside the attachment body to allow liquid to flow through the flow passage in one direction and to prevent the liquid from flowing in the opposite direction to the one direction.

[0012] [Aspect 6] An attachment device comprising: an attachment body attached to a defining body having a through hole; and a hollow cylindrical outer cylinder body that defines a large through hole so that the attachment body can be attached to another defining body having a large through hole whose internal space is relatively larger than that of the through hole, wherein the attachment body is an attachment body described in any one of [Aspect 1] to [Aspect 5], and the axial length of the outer cylinder body is longer than that of the first insertion portion and longer than that of the second insertion portion. Effect of the Invention

[0013] The present invention can be fitted to either of two different size through holes. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional view showing a resin underground burying box and an underground burying pipe. [Diagram 2] FIG. 2 is a cross-sectional view showing a concrete underground burial box and an underground burial pipe. [Diagram 3] FIG. 3 is an exploded perspective view showing the attachment and the insert member. [Figure 4] FIG. 4 is a cross-sectional view showing the attachment and the insert member. [Diagram 5] FIG. 5 is a perspective view showing the attachment and the insert member. [Figure 6] FIG. 6 is a perspective view showing the attachment and the insert member. [Figure 7] FIG. 7 is a cross-sectional view of the state in which the front cylinder portion is bonded to the inner peripheral surface of the exterior cylinder body. [Figure 8] FIG. 8 is a cross-sectional view showing an alternative mounting structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, one embodiment of an attachment body and an attachment body device will be described with reference to Figs. <Laying route> 1 and 2, the wiring 10 buried in the ground UG is inserted into a laying path buried in the ground UG. The laying path buried in the ground UG includes a plurality of underground buried boxes 11 buried at intervals and underground buried pipes 16 connecting adjacent underground buried boxes 11.

[0016] <Underground burial boxes and underground burial pipes> The underground burial boxes 11 include those made of synthetic resin material such as handholes, and those made of concrete such as manholes. In the following description, the underground burial boxes 11 made of synthetic resin material may be referred to as "resin underground burial boxes 111," and the underground burial boxes 11 made of concrete may be referred to as "concrete underground burial boxes 112."

[0017] The underground burial box 11, whether made of synthetic resin material or concrete, is a square box having a rectangular plate-shaped bottom wall 12 and four side walls 13 erected along the periphery of the bottom wall 12. The wall thickness of the bottom wall 12 and the side walls 13 of the resin underground burial box 111 is thinner than the wall thickness of the bottom wall 12 and the side walls 13 of the concrete underground burial box 112. The bottom wall 12 and the side walls 13 of the concrete underground burial box 112 are separate bodies from the bottom wall 12 and the side walls 13 of the resin underground burial box 111. The bottom wall 12 and the side walls 13 of the concrete underground burial box 112 are relatively thicker than the bottom wall 12 and the side walls 13 of the resin underground burial box 111.

[0018] The bottom wall 12 has an outer bottom surface 12a which is one surface of the bottom wall 12 in the wall thickness direction, and an inner bottom surface 12b which is the opposite surface of the outer bottom surface 12a in the wall thickness direction of the bottom wall 12. The side wall 13 has an outer surface 13a which is one surface of the side wall 13 in the wall thickness direction, and an inner surface 13b which is the opposite surface of the outer surface 13a in the wall thickness direction of the side wall 13.

[0019] The underground burial box 11 is a square box with a bottom that opens on the top. The top of the underground burial box 11 is closed by a lid 17 installed on the top of the underground burial box 11. The underground burial box 11 is buried in the ground UG so that the bottom wall 12 is on the lower side in the direction of gravity and the lid 17 is on the upper side in the direction of gravity. The space S of the underground burial box 11 is defined by the inner bottom surface 12b of the bottom wall 12 and the inner surfaces 13b of the four side walls 13, and the space S is closed by the lid 17. Each of the bottom wall 12 and the side walls 13 is a defining body that defines the space S. The wall thickness direction of the bottom wall 12 and the side walls 13 is the thickness direction of the defining body. Each of the bottom wall 12 and the side walls 13 can have a through hole 14 formed therein by a tool not shown.

[0020] A through hole 14 used for attaching the attachment body 20 is formed in one side wall 13 of the underground burial box 11 buried in the ground UG. The through hole 14 used for attaching the attachment body 20 to the side wall 13 is also referred to as an attachment body through hole 141.

[0021] Further, the two side walls 13 of the underground burial box 11 buried in the ground UG are formed with through holes 14 for connecting the underground buried pipe 16 via the connector 15. The through holes 14 for connecting the underground buried pipe 16 via the connector 15 are also referred to as pipe through holes 142. Of the two side walls 13 in which the pipe through holes 142 are formed, one of the side walls 13 also has an attachment through hole 141 formed therein. The attachment through hole 141 is formed closer to the bottom wall 12 than the pipe through hole 142.

[0022] The hole diameter R1 of the through hole 141 for the attachment in the resin underground burial box 111 is smaller than the hole diameter R2 of the through hole 141 for the attachment in the concrete underground burial box 112. A hollow cylindrical exterior cylinder 81 is inserted into the through hole 141 for the attachment in the concrete underground burial box 112. The exterior cylinder 81 has a uniform circular cross section in the axial direction. The outer diameter of the exterior cylinder 81 is larger than the outer diameter of the front cylinder portion 28 in the front member 21, and the inner diameter of the exterior cylinder 81 is approximately the same as the outer diameter of the front cylinder portion 28. The outer peripheral surface of the exterior cylinder 81 is bonded to the inner peripheral surface of the through hole 141 for the attachment. A large through hole 200 having an internal space larger than the through hole 141 for the attachment in the resin underground burial box 111 is defined inside the exterior cylinder 81. Therefore, the exterior cylindrical body 81 defines a large through hole 200. A first axial end face 81a of the exterior cylindrical body 81 is located on the same plane as the outer surface 13a of the side wall 13, and a second axial end face 81b of the exterior cylindrical body 81 is located on the same plane as the inner surface 13b of the side wall 13.

[0023] The exterior cylindrical body 81 has end openings 81d formed at both axial ends. Each end opening 81d opens to both axial ends of the exterior cylindrical body 81. Further, the depth D1 of the through hole 141 for the attachment member in the resin underground burial box 111 is smaller than the depth D2 of the through hole 141 for the attachment member in the concrete underground burial box 112. Therefore, the through hole 141 for the attachment member in the concrete underground burial box 112 is larger in the wall thickness direction than the through hole 141 for the attachment member in the resin underground burial box 111. Further, the depth D1 of the through hole 141 for the attachment member in the resin underground burial box 111 is the same as the wall thickness of the side wall 13 of the resin underground burial box 111, and the depth D2 of the through hole 141 for the attachment member in the concrete underground burial box 112 is the same as the wall thickness of the side wall 13 of the concrete underground burial box 112.

[0024] The through hole 141 for the attachment body of the resin underground burial box 111 and the through hole 141 for the attachment body of the concrete underground burial box 112 are different in size, as exemplified by R1, R2 and depths D1, D2. The volume of the internal space of the through hole 141 for the attachment body of the resin underground burial box 111 is smaller than the volume of the internal space of the through hole 141 for the attachment body of the concrete underground burial box 112. The inside of the exterior cylinder 81 of the concrete underground burial box 112 is a large through hole 200 having a relatively larger internal space than the through hole 141 for the attachment body of the resin underground burial box 111, and is a through hole 141 for the attachment body different from the through hole 141 for the attachment body of the resin underground burial box 111. Therefore, the side wall 13 of the concrete underground burial box 112 is provided with a large through hole 200.

[0025] The connector 15 is made of a synthetic resin material and has a cylindrical shape. The connector 15 is fitted into the pipe through hole 142. The underground buried pipe 16 is fitted into the connector 15 fitted into the pipe through hole 142, and the connector 15 and the underground buried pipe 16 are fixed together by a fixing member (not shown).

[0026] <Attachment body> The attachment body 20 is attached to the side wall 13 using the attachment body through hole 141 of the underground burial box 11 .

[0027] 3 and 4, the attachment body 20 includes a front member 21 and a back member 31. In addition, the attachment body 20 has an insert body 41, a valve seat portion 51, and a valve body 61 attached thereto.

[0028] <Front side material> The front side member 21 is disposed on the outer surface 13a side as the front surface side in the wall thickness direction of the side wall 13, and the back side member 31 is disposed on the inner surface 13b side as the back surface side in the wall thickness direction of the side wall 13.

[0029] As shown in Figs. 4 and 5, the front side member 21 includes a hollow cylindrical front side main body portion 22, a front side flange 24 integral with a first axial end 22a of the front side main body portion 22, a mesh portion 25 integral with a second axial end 22b of the front side main body portion 22, and a front side tube portion 28 extending from the front side flange 24 and serving as a second insertion portion.

[0030] A female thread 23 is formed on the inner peripheral surface of the front body portion 22. The front flange 24 extends from the outer peripheral surface of the front body portion 22 on the first end 22a side in the radial direction of the front body portion 22. The front flange 24 has a width in the radial direction of the front body portion 22. The front body portion 22 has a plurality of arm portions 25a extending from the inner peripheral surface of the front body portion 22 on the second end 22b side in the radial direction of the front body portion 22. The mesh portion 25 is supported by the plurality of arm portions 25a. The mesh portion 25 has a plurality of meshes 25b formed therein, which penetrate the mesh portion 25 in the plate thickness direction. The size of the meshes 25b is large enough to prevent foreign matter from passing through.

[0031] The front-side main body portion 22 includes a stopper 22c extending from an inner circumferential surface of the front-side main body portion 22 in a radial direction of the front-side main body portion 22. The stopper 22c is located on the inner circumferential surface of the front-side main body portion 22, closer to the first end 22a than the mesh 25b in the axial direction of the front-side main body portion 22, and closer to the second end 22b than the female thread 23.

[0032] The front side member 21 may include a foreign object passage prevention material 27 disposed between the mesh portion 25 and the stopper 22c in the axial direction of the front side main body portion 22. The foreign object passage prevention material 27 is disk-shaped and made of urethane foam. The foreign object passage prevention material 27 is water permeable and prevents the passage of foreign objects.

[0033] The front side tube portion 28 extends from the front side flange 24 toward the second end 22b of the front side main body portion 22. The front side tube portion 28 is cylindrical and covers a part of the axial direction of the front side main body portion 22 from the outer circumferential surface side. The front side tube portion 28 and the front side main body portion 22 overlap in the radial direction of the front side member 21. The inner circumferential surface of the front side tube portion 28 is separated from the outer circumferential surface of the front side main body portion 22 in the radial direction of the front side main body portion 22. Therefore, the outer diameter of the front side member 21 at the front side main body portion 22 is smaller than the outer diameter of the front side member 21 at the front side tube portion 28. The front side main body portion 22 as a screwing portion has the front side tube portion 28 as a second insertion portion on its outer circumferential surface, and the front side main body portion 22 has a female thread 23 on the inside that overlaps with the front side tube portion 28 in the axial direction of the front side main body portion 22. This female thread 23 is screwed into a male thread 33 of a back side member 31 which will be described later.

[0034] The outer peripheral surface of the front side tube portion 28 is a cylindrical surface. The outer diameter of the front side tube portion 28 of the front side member 21 is slightly smaller than the hole diameter R2 of the attachment through hole 141 of the concrete underground burial box 112, the inner diameter of the exterior cylindrical body 81, and the inner diameter of the end opening 81d. Therefore, the front side member 21 can be inserted into the large through hole 200 of the concrete underground burial box 112 from the front side tube portion 28 side. Specifically, the front side member 21 can be inserted into the inside of the end opening 81d of the exterior cylindrical body 81. Therefore, the front side member 21 has the front side tube portion 28 as a second insertion portion that can be inserted into the large through hole 200.

[0035] Furthermore, the length of the front-side tubular portion 28 in the insertion direction relative to the attachment through-hole 141 of the concrete underground box 112 is the length of the front-side tubular portion 28 in the axial direction of the front-side member 21. The length of the front-side tubular portion 28 in this insertion direction is shorter than the thickness, i.e., the wall thickness, of the concrete underground box 112, and therefore the axial length of the exterior tubular body 81. For this reason, when the front-side tubular portion 28 is inserted into the large through-hole 200 of the concrete underground box 112, the front-side tubular portion 28 is housed within the large through-hole 200 and does not protrude from the side wall 13 of the concrete underground box 112.

[0036] The front side member 21 may include a plurality of reinforcing ribs 29 that connect the outer peripheral surface of the front side main body portion 22 and the inner peripheral surface of the front side tube portion 28. The reinforcing ribs 29 function as finger hooks on which fingers can be hooked when operating the front side member 21.

[0037] <Back side material> As shown in Figures 4 and 6, the rear side member 31 comprises a cylindrical rear side main body portion 32, a rear side flange 34 integral with the first axial end 32a side of the rear side main body portion 32, and a rear side tube portion 35 extending from the rear side flange 34.

[0038] A male thread 33 is formed on the outer peripheral surface of the back side main body 32. The back side main body 32 is inserted into the through hole 141 for the attachment of the underground burial box 11. Therefore, the back side member 31 includes the back side main body 32 as a first insertion part to be inserted into the through hole 141 for the attachment.

[0039] The axial length of the back body 32 is greater than the wall thickness of the side wall 13 of the resin underground burial box 111, i.e., the depth D1 of the through hole 141 for the attachment, and is smaller than the wall thickness of the side wall 13 of the concrete underground burial box 112, i.e., the depth D2 of the through hole 141 for the attachment, and thus the axial length of the exterior cylinder 81. Therefore, the length of the back body 32 in the insertion direction into the through hole 141 for the attachment of the resin underground burial box 111 is longer than the length of the through hole 141 for the attachment in the insertion direction. Therefore, when the back body 32 is inserted into the through hole 141 for the attachment of the resin underground burial box 111, the back body 32 protrudes from the outer surface 13a of the side wall 13.

[0040] A male screw 33 is provided at the tip of the rear body 32 protruding from the outer surface 13a of the side wall 13 of the resin underground burial box 111. The female screw 23 of the front member 21 is screwed into the male screw 33. Therefore, the rear member 31, which is one of the front member 21 and the rear member 31, has the rear body 32 as a first insertion part inserted into the through hole 141 for the attachment. Furthermore, the front member 21, which is one of the front member 21 and the rear member 31, has the front tube part 28 as a second insertion part. Therefore, the attachment 20 has both the rear body 32 as the first insertion part and the front tube part 28 as the second insertion part. Furthermore, the front member 21, which is the other of the front member 21 and the rear member 31, has the front body 22 as a screw part screwed into the rear body 32.

[0041] On the other hand, the length of the rear body 32 in the insertion direction into the large through hole 200 of the concrete underground box 112 is shorter than the length of the large through hole 200 in the insertion direction. Therefore, when the rear body 32 is inserted into the large through hole 200 of the concrete underground box 112, the rear body 32 does not protrude from the outer surface 13a of the side wall 13.

[0042] The back flange 34 extends in the radial direction of the back body 32 from the outer peripheral surface of the first end 32a of the back body 32. The back flange 34 has a width in the radial direction of the back body 32. The back tube 35 extends from the back flange 34 toward the opposite side of the back body 32. The back tube 35 is cylindrical. A plurality of guide grooves 35a are formed at equal intervals on the inner peripheral surface of the back tube 35. Each guide groove 35a extends obliquely from the tip end of the back tube 35 toward the base end, and then extends in the circumferential direction of the back tube 35.

[0043] The rear cylinder portion 35 includes a plurality of ribs 36 that are integrated with both the rear flange 34 and the rear cylinder portion 35. Each rib 36 protrudes in a thin plate shape from the outer circumferential surface of the rear cylinder portion 35 and protrudes from the rear flange 34 on the inside of the periphery of the rear flange 34. The outer shape of the rear cylinder portion 35 is different from the outer shape of the front cylinder portion 28.

[0044] <insert> The insert 41 is inserted into the inside of the rear cylinder portion 35 of the rear member 31, and is detachable from the rear member 31. The insert 41 is cylindrical. The outer diameter of the insert 41 is smaller than the inner diameter of the rear cylinder portion 35.

[0045] The insert 41 has an insert flange 43 on a first axial end 41a side and an engagement flange 44 on a second axial end 41b side. The insert 41 also has an annular rib 45 located between the insert flange 43 and the engagement flange 44 in the axial direction of the insert 41.

[0046] The insert flange 43, the engagement flange 44, and the annular rib 45 each extend from the outer circumferential surface of the insert 41 in the radial direction of the insert 41. The insert 41 has a plurality of engagement protrusions 42 on its outer circumferential surface. The plurality of engagement protrusions 42 are provided between the insert flange 43 and the annular rib 45 in the axial direction of the insert 41. The plurality of engagement protrusions 42 are formed at equal intervals in the circumferential direction of the insert 41. The number of the engagement protrusions 42 is the same as the number of the guide grooves 35a formed in the back cylinder portion 35. Each engagement protrusion 42 is inserted into the corresponding guide groove 35a. After the engagement protrusion 42 is inserted into the guide groove 35a from the tip side of the back cylinder portion 35, when the insert 41 is rotated, the engagement protrusion 42 is guided by the guide groove 35a toward the base end of the back cylinder portion 35. Therefore, when the insert 41 is rotated, the insert 41 can be guided toward the base end of the back cylinder portion 35. Furthermore, the guide groove 35a guides the engaging protrusion 42 so as to rotate in the circumferential direction of the back cylinder portion 35. In this way, the insert 41 is assembled to the back member 31.

[0047] When the insert 41 is rotated in the direction opposite to that when the insert 41 is assembled to the rear member 31, the guide groove 35a guides the engaging protrusion 42 to rotate in the circumferential direction of the rear cylinder portion 35. Furthermore, when the insert 41 is rotated in the direction opposite to that when the insert 41 is assembled to the rear member 31, the guide groove 35a guides the engaging protrusion 42 from the base end side to the tip end side of the rear cylinder portion 35. Then, the insert 41 can be removed from the rear member 31.

[0048] The insert 41 has an engagement groove 41c defined between the engagement flange 44 and the annular rib 45 in the axial direction of the insert 41. The engagement groove 41c is formed around the entire circumference of the insert 41.

[0049] The insert 41 includes a bridge portion 43a and an annular portion 43b radially inward of the insert flange 43. The bridge portions 43a are formed at 90 degree intervals in the circumferential direction of the insert flange 43. The annular portions 43b are formed concentrically with the insert flange 43. Thus, a plurality of inlet holes 43c are defined by the bridge portion 43a and the annular portion 43b radially inward of the insert flange 43. Each inlet hole 43c has an arc shape that widens from the radial inner side of the insert flange 43 toward the outer side.

[0050] The insert 41 includes a gripping portion 46. The gripping portion 46 extends from the bridge portion 43a along the axial direction of the insert 41. The gripping portion 46 is in the form of a thin plate extending in the diameter direction of the insert flange 43.

[0051] <Valve seat> The valve seat portion 51 is formed of a hydrophobic material. Examples of hydrophobic materials include hydrophobic silicone rubber and hydrophobic fluororubber. In this embodiment, the valve seat portion 51 is made of hydrophobic silicone rubber that is flexible and deformable. Note that hydrophobicity means having a low affinity with water. Also, hydrophobicity means a property that makes it difficult for water to spread thinly on the surface of an object and makes it easy to form droplets. Therefore, by making the valve seat portion 51 hydrophobic, water does not spread thinly on the surface of the valve seat portion 51 and is easy to form droplets.

[0052] 3 and 4, the valve seat portion 51 includes a disk-shaped base portion 52, a peripheral wall 53 protruding from the periphery of the base portion 52, and a seal portion 54 provided at the tip of the peripheral wall 53. The base portion 52, the peripheral wall 53, and the seal portion 54 are integrally molded.

[0053] The base 52 is disk-shaped. The thickness direction of the base 52 corresponds to the thickness direction of the valve seat 51, and the radial direction of the base 52 corresponds to the radial direction of the valve seat 51. The outer peripheral portion 55 of the base portion 52 is formed so as to protrude from one surface of the base portion 52 in the plate thickness direction and to be recessed from the other surface. The peripheral wall 53 protrudes from the outer peripheral edge of the outer peripheral portion 55 toward the other surface side of the base portion 52 in the plate thickness direction. The base portion 52 has a first seating surface 52a on one surface in the plate thickness direction, and a second seating surface 52b on the opposite surface of the first seating surface 52a in the plate thickness direction, i.e., the other surface. The first seating surface 52a is located at a position recessed in the plate thickness direction from the outer peripheral portion 55, and the outer peripheral portion 55 is located at a position recessed in the plate thickness direction from the second seating surface 52b. Therefore, the outer peripheral portion 55 surrounds the first seating surface 52a with the first seating surface 52a on the inside. The second seating surface 52b has a larger area than the first seating surface 52a. In other words, the outer circumferential portion 55 defines the first seating surface 52a in an area narrower than the second seating surface 52b.

[0054] A shaft insertion hole 52c and a plurality of through holes 52d are formed in the base 52. The shaft insertion hole 52c penetrates the center of the base 52 in the plate thickness direction. The plurality of through holes 52d are arranged at equal intervals in the circumferential direction of the base 52, centered on the shaft insertion hole 52c. Each of the through holes 52d penetrates the base 52 in the plate thickness direction.

[0055] The peripheral wall 53 protrudes cylindrically from the outer circumferential edge of the outer circumferential portion 55 toward the second seating surface 52b. The inner diameter of the seal portion 54 of the valve seat portion 51 is slightly smaller than the outer diameter of the outer circumferential surface where the engagement recess 41c of the insert 41 is located. The seal portion 54 protrudes inward from the inner circumferential surface of the peripheral wall 53 and protrudes outward from the outer circumferential surface of the peripheral wall 53 in the radial direction of the valve seat portion 51. For this reason, the length of the seal portion 54 in the radial direction of the valve seat portion 51 is greater than the length of the peripheral wall 53 in the radial direction of the valve seat portion 51.

[0056] An insertion groove 56 is defined in the valve seat 51 radially inwardly of the outer periphery 55. The insertion groove 56 is defined on the outer periphery side of the valve seat 51 and on the inner periphery side of the peripheral wall 53 in the radial direction.

[0057] <Valve body> The valve body 61 is formed of a hydrophobic material, similar to the valve seat portion 51. The valve body 61 is made of hydrophobic silicone rubber. The valve body 61 includes a disk-shaped tongue portion 62 and a shaft portion 63 protruding from the center of the tongue portion 62. The tongue portion 62 is thin and elastically deformable. The outer diameter of the tongue portion 62 is smaller than the inner diameter of the rear cylinder portion 35 of the rear member 31. The tongue portion 62 includes a valve portion 62a on the radial outer periphery. The valve portion 62a is a portion of the tongue portion 62 that is thicker than the portions of the tongue portion 62 other than the valve portion 62a. The valve portion 62a protrudes toward the protruding side of the shaft portion 63 in the thickness direction of the tongue portion 62. The tip portion of the shaft portion 63 has a larger diameter than the base end portion.

[0058] <The entire attachment> The attachment body 20 is formed by screwing the front side member 21 and the back side member 31 together. Specifically, the back side body part 32 of the back side member 31 is inserted into the inside of the front side body part 22 of the front side member 21, while the male thread 33 of the back side member 31 is screwed into the female thread 23 of the front side body part 22. In this way, the front side member 21 and the back side member 31 are screwed together to form the attachment body 20. In the screwed state of the front side member 21 and the back side member 31, the central axis of the front side member 21 and the central axis of the back side member 31 are positioned on the same straight line. Therefore, in the attachment body 20, the axial direction of the front side member 21 and the axial direction of the back side member 31 are the same. The direction that coincides with the axial directions of the front side member 21 and the back side member 31 is defined as the axial direction of the attachment body 20.

[0059] In the front side member 21 and the rear side member 31 which are screwed together, the front side flange 24 of the front side member 21 and the rear side flange 34 of the rear side member 31 face each other in the axial direction of the attachment body 20. The distance between the front side flange 24 and the rear side flange 34 in the axial direction of the attachment body 20 becomes narrower due to the relative forward screwing of the female thread 23 and the male thread 33, and becomes wider due to the relative retraction of the female thread 23 and the male thread 33.

[0060] A surface packing 72 may be disposed between the front flange 24 and the back flange 34. The surface packing 72 is in the form of a rubber ring. The radial width of the surface packing 72 is the same as the radial width of the front flange 24 and the back flange 34, but may be different.

[0061] In the attachment body 20 , the outer surface shape of the front cylinder portion 28 of the front member 21 is different from the outer surface shape of the back cylinder portion 35 of the back member 31 . In the attachment body 20, the back side cylinder portion 35 serves as a liquid inlet 20a by opening at one axial end of the attachment body 20. In addition, in the attachment body 20, the front side main body portion 22 serves as a liquid outlet 20b by opening at the other axial end of the attachment body 20. Note that, since the other axial end of the attachment body 20 opens through the mesh 25b of the mesh portion 25, the mesh 25b also serves as the outlet 20b.

[0062] When the male thread 33 of the rear body portion 32 and the female thread 23 of the front body portion 22 are screwed together, a flow passage R is defined inside the attachment body 20 formed by integrating the front member 21 and the rear member 31. The flow passage R is defined by communicating the internal space of the rear cylinder portion 35 in the rear member 31 and the internal space of the rear body portion 32 with the internal space at the tip of the front body portion 22 in the front member 21. The flow passage R connects the inlet 20a in the rear cylinder portion 35 with the outlet 20b in the front body portion 22.

[0063] <Insertion Part> The insert 41 , the valve seat 51 and the valve body 61 are assembled together to form an insert member 71 .

[0064] The shaft portion 63 of the valve body 61 is inserted into the shaft insertion hole 52c of the valve seat portion 51. The base portion 52 is sandwiched between the valve tongue portion 62 and the tip side of the shaft portion 63. In this way, the valve body 61 is attached to the base portion 52. Therefore, the valve body 61 has the shaft portion 63 attached to the base portion 52.

[0065] When the shaft portion 63 is inserted from the first seating surface 52a toward the second seating surface 52b of the valve seat portion 51, the valve portion 62a seats on the first seating surface 52a. When the shaft portion 63 is inserted from the second seating surface 52b of the valve seat portion 51 toward the first seating surface 52a, the valve portion 62a seats on the second seating surface 52b.

[0066] In the insert member 71, the engagement flange 44 side of the insert body 41 is inserted into the inside of the peripheral wall 53 of the valve seat portion 51. The engagement flange 44 is inserted into the insertion groove portion 56 of the valve seat portion 51. The engagement flange 44 is sandwiched between the inner peripheral surface of the peripheral wall 53 and the outer peripheral edge of the base portion 52 in the radial direction of the valve seat portion 51. In this way, the insert body 41 is assembled integrally with the valve seat portion 51, and the valve body 61 attached to the valve seat portion 51 is also assembled integrally with the insert body 41. In this way, the insert member 71 is formed.

[0067] As described above, the inner diameter of the seal portion 54 of the valve seat portion 51 is slightly smaller than the outer diameter of the outer peripheral surface of the insert body 41 where the engagement groove 41c is located. Therefore, the inner peripheral edge of the seal portion 54 is in close contact with the outer peripheral surface of the insert body 41. The seal portion 54 fits into the engagement groove 41c of the insert body 41. The seal portion 54 can engage with the engagement flange 44 that defines the engagement groove 41c.

[0068] <Attachment and valve body> An insert member 71 is integrated with the attachment body 20. The insert member 71 is inserted into the rear cylinder portion 35 of the rear member 31 from the engaging protrusion 42 side, and the insert body 41 is inserted into the rear member 31. As described above, the inside of the rear cylinder portion 35 defines the inlet 20a, and therefore the insert body 41 is inserted into the inlet 20a of the inlet 20a and the outlet 20b.

[0069] When the insert member 71 is integrated with the attachment body 20, the engaging protrusion 42 is inserted into the guide groove 35a to assemble the insert body 41 to the back side member 31. At this time, the insert body 41 is inserted into the inlet 20a of the attachment body 20 while holding the valve seat portion 51. Then, as the insert body 41 is inserted into the inlet 20a, the base portion 52 of the valve seat portion 51 covers the inlet 20a.

[0070] In addition, in the radial direction of the insert 41, the outer peripheral edge of the seal portion 54 protrudes radially outward from the outer peripheral edge of the annular rib 45. The outer peripheral edge of the seal portion 54 is in close contact with the inner peripheral surface of the rear cylinder portion 35. The seal portion 54 seals between the insert 41 and the rear cylinder portion 35, that is, between the attachment 20 and the insert member 71. On the rear member 31 side in the axial direction of the attachment 20, the grip portion 46 of the insert 41 protrudes in the axial direction.

[0071] In the attachment body 20, the inlet 20a defined inside the back member 31 communicates with the outside of the attachment body 20 via the inlet hole 43c of the insert 41. In the attachment body 20, the valve body 61 and the base 52 of the valve seat 51 are disposed midway through the flow passage R.

[0072] <How to use the attachment> First, a case will be described in which the attachment body 20 is attached to the resin underground box 111 and the check valve is installed in the resin underground box 111. Note that the attachment body 20 is assumed to be disassembled into the front member 21 and the back member 31, and the insertion member 71 is assumed not to be assembled to the attachment body 20.

[0073] First, the through hole 141 for the attachment is formed in the side wall 13 of the resin underground burial box 111. The hole diameter R1 of the through hole 141 for the attachment is set to a size that allows the rear body portion 32 to be inserted therethrough. 1 and 4, with the surface packing 72 attached to the rear body part 32, the rear body part 32 is inserted into the attachment through hole 141 from the space S side of the resin underground burial box 111. The rear body part 32 penetrates the side wall 13, and the male thread 33 protrudes from the outer surface 13a of the side wall 13. Therefore, the rear member 31, which is one of the front member 21 and the rear member 31, is the first insertion part to be inserted into the attachment through hole 141.

[0074] Next, the female thread 23 of the front side member 21 is screwed into the male thread 33 of the rear side main body portion 32. Therefore, the front side member 21, which is the other of the front side member 21 and the rear side member 31, is a screw portion that is screwed into the rear side main body portion 32.

[0075] It is preferable that the worker performs the screwing operation by placing his / her fingers on the reinforcing rib 29 of the front member 21. Then, the front flange 24 and the back flange 34 hold the side wall 13. That is, the front member 21 and the back member 31 hold the side wall 13 of the resin underground burial box 111 from both sides in the wall thickness direction while screwing the back body part 32 as the first insertion part and the front body part 22 as the screwing part, thereby attaching the attachment body 20 to the side wall 13. Therefore, the attachment body 20 has a clamping mechanism that clamps the side wall 13 of the resin underground burial box 111 from both sides in the wall thickness direction between the front member 21 and the back member 31 while screwing the back body part 32 and the front body part 22, thereby enabling the attachment body 20 to be attached to the side wall 13. The clamping mechanism is composed of the front member 21 and the back member 31. The surface packing 72 is sandwiched between the side wall 13 and the rear flange 34 and is in close contact with the inner surface 13 b of the side wall 13 .

[0076] As a result, the attachment body 20 is attached to the side wall 13 of the resin underground burial box 111 using the attachment body through hole 141. Thereafter, the engagement protrusion 42 of the insert member 71 is inserted into the guide groove 35a of the back member 31 to assemble the insert member 41 to the back member 31, thereby integrating the insert member 71 with the attachment body 20. Thus, the front member 21, the back member 31, the insert member 41, the valve seat portion 51, and the valve body 61 are integrated, and a check valve is installed in the resin underground burial box 111.

[0077] Next, a case where the check valve is installed in the underground concrete box 112 by attaching the mounting member 20 to the underground concrete box 112 will be described. As shown in Figures 2 and 7, a hollow cylindrical outer cylindrical body 81 is inserted into the attachment through hole 141 of the concrete underground burial box 112, and a large through hole 200 is defined inside the outer cylindrical body 81.

[0078] Now, even when the rear body 32 is inserted into the large through hole 200, the rear body 32 does not protrude from the outer surface 13a of the side wall 13. Therefore, the female thread 23 of the front body 22 cannot be screwed into the male thread 33 of the rear body 32, and the side wall 13 cannot be clamped between the front member 21 and the rear member 31. Therefore, the wall thickness of the side wall 13 of the underground concrete box 112 is such that it cannot be clamped between the front member 21 and the rear member 31 by the clamping mechanism.

[0079] In this case, of the front side member 21 and the back side member 31 of the attachment 20, the front side member 21 is inserted into the large through hole 200. Therefore, the front side member 21, which is one of the front side member 21 and the back side member 31 in which the male thread 33 of the back side main body portion 32 and the female thread 23 of the front side main body portion 22 are screwed together, has a front side tube portion 28 as a second insertion portion that can be inserted into the large through hole 200.

[0080] Then, the outer peripheral surface of the front cylinder portion 28 is bonded with an adhesive to the inner peripheral surface at one end opening 81d in the axial direction of the exterior cylinder body 81, i.e., the demarcating surface of the large through hole 200. This allows the attachment body 20 to be attached to the side wall 13 of the concrete underground burial box 112 using the large through hole 200. Therefore, the attachment body 20 has an adhesive mechanism that allows the attachment body 20 to be attached to the concrete underground burial box 112 by bonding the outer peripheral surface of the front cylinder portion 28 to the demarcating surface of the large through hole 200. The adhesive mechanism is formed by the front cylinder portion 28 of the front member 21. Therefore, the attachment body 20 has two mechanisms, a clamping mechanism and an adhesive mechanism.

[0081] The attachment device 100 is formed from the exterior cylinder body 81 and the attachment body 20. The attachment device 100 comprises the attachment body 20 attached to the side wall 13 provided with the attachment body through hole 141, and a hollow cylindrical exterior cylinder body 81 that defines the large through hole 200 so as to be attachable to the side wall 13 provided with the large through hole 200 whose internal space is relatively larger than the attachment body through hole 141.

[0082] The outer peripheral surface of the front-side tube portion 28 is a cylindrical surface. Meanwhile, ribs 36 are formed on the outer peripheral surface of the back-side tube portion 35. Compared to the cylindrical surface of the front-side tube portion 28, the ribs 36 have a shape that makes them unable to be adhered to or inserted into the boundary surface of the large through hole 200. Therefore, the back-side tube portion 35, which is the other of the front-side member 21 and the back-side member 31, has a different shape from the front-side tube portion 28 and has an outer surface that makes it unable to be adhered to or inserted into the large through hole 200.

[0083] Thereafter, the engaging projection 42 of the insert member 71 is inserted into the guide groove 35a of the back member 31 to assemble the insert body 41 to the back member 31, thereby integrating the insert member 71 with the attachment body 20. Thus, the front member 21, the back member 31, the insert body 41, the valve seat 51, and the valve body 61 are integrated, and the check valve is installed in the concrete underground box 112.

[0084] When the attachment body 20 is attached to the underground burial box 11 , the inlet 20 a of the flow passage R opens into the space S of the underground burial box 11 , and the outlet 20 b opens outside the underground burial box 11 . In the flow passage R, liquid water flows from inside the underground burial box 11 to the outside. Specifically, the water inside the underground burial box 11 flows from the inlet 20a into the inside of the attachment body 20, and then flows through the flow passage R toward the outlet 20b. The flow direction of water in the flow passage R is from the inlet 20a toward the outlet 20b.

[0085] The inlet 20a side is the upstream side and the outlet 20b side is the downstream side in the flow direction of water in the flow passage R. Further, the through hole 52d formed in the base 52 of the valve seat 51 penetrates the base 52 in the flow direction of the flow passage R.

[0086] The base 52 separates the inlet 20a and the outlet 20b. The valve portion 62a of the valve body 61 is seated on a first seating surface 52a of the base 52. When the valve portion 62a is seated on the base 52, the through hole 52d is closed by the valve body 61. Therefore, when the valve portion 62a is seated on the base 52, the inlet 20a and the outlet 20b are blocked by the valve seat portion 51 and the valve body 61.

[0087] In a usage mode of the attachment 20, when water flows into the inlet 20a through the inlet hole 43c and reaches the valve portion 62 through the through hole 52d, water pressure acts on the valve portion 62. When the water pressure acting on the valve portion 62 exceeds a threshold value, the valve portion 62 deforms and the valve portion 62a moves away from the first seating surface 52a. As a result, the inlet 20a and the outlet 20b communicate with each other through the through hole 52d, and the water that has flowed into the inlet 20a flows out to the outlet 20b through the flow passage R. The water that has flowed out to the outlet 20b passes through the foreign object passage prevention material 27 and then flows out to the outside of the attachment 20 through the mesh 25b of the mesh portion 25.

[0088] In the use of the attachment 20, when water flows into the outlet 20b through the mesh 25b of the mesh portion 25 and reaches the valve portion 62, water pressure acts on the valve portion 62. The water pressure acting on the valve portion 62 presses the valve portion 62a against the first seating surface 52a. This prevents water from flowing from the outlet 20b to the inlet 20a, that is, prevents water from flowing back from the outlet 20b to the inlet 20a. Therefore, the attachment 20 integrated with the insert member 71 is provided with a check valve. In other words, a check valve is arranged inside the attachment 20 to allow water to flow in one direction through the flow passage R and to prevent water from flowing in the opposite direction.

[0089] According to the above embodiment, the following effects can be obtained. (1) For a resin underground burial box 111, the attachment body 20 is attached to the side wall 13 by clamping the side wall 13 between the front member 21 and the back member 31, using the attachment body through hole 141. For a concrete underground burial box 112, the attachment body 20 is attached to the side wall 13 by bonding the front cylinder portion 28 to the demarcated surface of the large through hole 200, using the attachment body through hole 141. Therefore, the attachment body 20 can be attached to the side wall 13 using either the attachment body through hole 141 or the large through hole 200, which are of different sizes. In other words, the attachment body 20 can be attached to two types of underground burial boxes 11.

[0090] This eliminates the need to prepare multiple types of mounting bodies 20 according to the size of the side wall 13, thereby reducing the number of fixtures to be transported to the installation site of the underground burial box 11. Also, for the worker, in the middle of the work of clamping the side wall 13 between the front side member 21 and the back side member 31 to attach the attachment body 20, if the side wall 13 cannot be clamped between the front side member 21 and the back side member 31, the attachment method of the attachment body 20 can be changed. Therefore, since it is not necessary to prepare an attachment body 20 of a different size and perform the work of attaching it to the side wall 13 again, the workability of attaching the attachment body 20 to the side wall 13 is improved.

[0091] (2) The attachment body 20 is equipped with a clamping mechanism and an adhesive mechanism. The clamping mechanism allows the attachment body 20 to be attached to a resin underground burial box 111 with a thin wall thickness. The adhesive mechanism allows the attachment body 20 to be attached even to a concrete underground burial box 112 with a thick wall thickness and therefore an insufficient axial length of the back body portion 32. Therefore, the attachment body 20 can be attached to the side wall 13 of two types of underground burial boxes 11 with different wall thicknesses.

[0092] (3) By adjusting the size of the internal space of the through-hole 141 for the attachment formed in the underground burial box 11, the method of attaching the attachment 20 to the side wall 13 can be changed from a clamping mechanism to an adhesive mechanism. (4) The length of the front-side tubular portion 28 is smaller than the wall thickness of the side wall 13 of the concrete underground burial box 112. Therefore, when the outer peripheral surface of the front-side tubular portion 28 is bonded to the boundary surface of the large through-hole 200, the entire outer peripheral surface of the front-side tubular portion 28 can be bonded, so that the attachment member 20 can be firmly bonded to the side wall 13.

[0093] (5) The attachment member 20 can be attached to the side wall 13 by using either the attachment member through hole 141 of the resin underground burial box 111 or the large through hole 200 provided in the concrete underground burial box 112. Therefore, the attachment member 20 can be attached even after the wall thickness of the side wall 13 has been confirmed at the installation site of the underground burial box 11.

[0094] (6) When the front member 21 and the rear member 31 are screwed together, the front cylinder portion 28 and the rear cylinder portion 35 have different shapes. In particular, the outer surface shape of the rear cylinder portion 35 is different from the cylindrical surface of the front cylinder portion 28, and has a shape in which the ribs 36 protrude. In other words, the rear cylinder portion 35 is visually easy to recognize as a shape that is not suitable for bonding. For this reason, the worker can easily notice that the front cylinder portion 28 side is the part to be bonded to the side wall 13 of the concrete underground box 112.

[0095] (7) The insert body 41 integrated with the valve body 61 is inserted inside the rear cylinder portion 35. The rear member 31 has the rear cylinder portion 35 for integrating the valve body 61 with the attachment body 20. In other words, the rear member 31 is a member to be positioned on the rear side of the side wall 13. Therefore, the rear cylinder portion 35 of the rear member 31 has a shape that is not suitable for adhesion, and it is easy to visually recognize that it is a portion to be positioned on the rear side of the side wall 13.

[0096] (8) The front side member 21 has a female thread 23 on the inner peripheral surface of the front side main body portion 22, and has a front side tubular portion 28 on the outer peripheral side of the front side main body portion 22. For example, compared to a case in which the female thread 23 and the front side tubular portion 28 are aligned in the axial direction of the front side member 21, the axial length of the front side member 21 can be made shorter, and the axial length of the attachment body 20 can also be made shorter.

[0097] (9) The attachment body 20 has an inlet 20a and an outlet 20b. When the insert member 71 is integrated with the attachment body 20, the valve body 61 and the valve seat 51 can be provided on the attachment body 20. The valve seat 51 and the valve body 61 are a check valve that allows water to flow from the inlet 20a to the outlet 20b, while preventing water from flowing from the outlet 20b to the inlet 20a. The attachment body 20 can be attached to both the attachment body through hole 141 and the large through hole 200, which have relatively different sizes of internal space, so that the attachment body 20 can be used to install a check valve in both the attachment body through hole 141 and the large through hole 200, which have different sizes of internal space.

[0098] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. The reinforcing ribs 29 of the front member 21 do not have to be provided.

[0099] In the embodiment, the surface packing 72 is interposed between the inner surface 13b of the side wall 13 and the rear flange 34 of the rear member 31. In addition to this, the surface packing 72 may also be interposed between the outer surface 13a of the side wall 13 and the front flange 24. Alternatively, the surface packing 72 may not be interposed between the inner surface 13b of the side wall 13 and the rear flange 34 of the rear member 31, and the surface packing 72 may be interposed only between the outer surface 13a of the side wall 13 and the front flange 24.

[0100] When the side wall 13 is sandwiched between the front member 21 and the rear member 31, the surface packing 72 does not need to be provided. The through hole 141 for the attachment of the concrete underground box 112 may be formed by embedding a void pipe arranged in a concrete formwork into the concrete framework that forms the side wall 13. In this case, the void pipe can serve as an exterior cylindrical body. When the void pipe is removed from the side wall 13, the outer peripheral surface of the front cylindrical portion 28 of the attachment 20 is directly bonded to the defined surface of the through hole 141 for the attachment. In other words, when attaching the attachment 20 to the side wall 13 of the concrete underground box 112, the exterior cylindrical body 81 does not need to be used.

[0101] Regarding the front side member 21, the length of the front side main body portion 22 in the axial direction of the front side member 21 is increased. Then, the female thread 23 may be formed on the inner peripheral surface of the front side main body portion 22 close to the front side flange 24, and the front side tubular portion 28 may be provided on the axial tip side of the female thread 23. In other words, instead of arranging the female thread 23 and the front side tubular portion 28 at the same position in the axial direction of the front side member 21, the female thread 23 and the front side tubular portion 28 may be arranged offset from each other in the axial direction of the front side member 21.

[0102] Regarding the back side member 31, the rib 36 of the back side tubular portion 35 is removed, and the outer diameter of the back side tubular portion 35 is expanded to be equal to the outer diameter of the front side tubular portion 28. Then, when attaching the attachment body 20 to the side wall 13 of the concrete underground burial box 112, the back side tubular portion 35 may be used as the second insertion portion. When configured in this way, the attachment body 20 has second insertion portions on both sides in the axial direction of the attachment body 20.

[0103] In this case, the outer diameter of the back-side tubular portion 35 may be made different from the outer diameter of the front-side tubular portion 28. Specifically, the outer diameter of the back-side tubular portion 35 is reduced to be the same as or smaller than the hole diameter of the attachment through hole 141. In this configuration, when the attachment body 20 is attached to the side wall 13 by adhesion, the attachment body 20 can accommodate two types of attachment through holes 141.

[0104] For the rear member 31, the rib 36 of the rear cylinder portion 35 is removed, and the outer diameter of the rear cylinder portion 35 is expanded to be equal to the outer diameter of the front cylinder portion 28. Meanwhile, for the front member 21, a rib is provided on the outer circumferential surface of the front cylinder portion 28 to make it impossible to insert it into the large through hole 200 of the concrete underground box 112. When the attachment body 20 is attached to the large through hole 200 of the concrete underground box 112, the rear cylinder portion 35 may be used as the second insertion portion. When configured in this way, the attachment body 20 has the second insertion portion only on one end side of the attachment body 20 in the axial direction.

[0105] In this configuration, the front-side tube portion 28 has a shape with protruding ribs. In other words, it is easy to visually recognize that the front-side tube portion 28 has a shape that is not suitable for bonding. For this reason, the worker is likely to realize that he or she is about to bond the back-side tube portion 35 to the side wall 13.

[0106] As shown in Fig. 8, the length of the rear body 32 in the axial direction may be longer than the depth D2 of the through hole 141 for the attachment in the concrete underground box 112. Then, a male screw 33 is formed at the tip of the rear body 32 protruding from the outer surface 13a of the side wall 13. In this configuration, the front body 22 of the front member 21 is screwed into the male screw 33 protruding from the large through hole 200, so that the side wall 13 of the concrete underground box 112 can be sandwiched between the front member 21 and the rear member 31. This allows the attachment 20 to be attached to the side wall 13 of the concrete underground box 112.

[0107] Also, the outer peripheral surface of the front cylinder portion 28 can be bonded to the inner peripheral surface of the exterior cylinder body 81 to attach the attachment member 20 to the side wall 13 of the underground concrete box 112. Therefore, the attachment member 20 can be attached to the underground box 11 by either the clamping mechanism or the adhesive mechanism.

[0108] For the front side member 21, a cylindrical portion is extended from the front side flange 24 to the opposite side to the front side cylindrical portion 28. The outer diameter of this cylindrical portion is made smaller than the hole diameter of the through hole 141 for the attachment body so that the cylindrical portion can be inserted into the through hole 141 for the attachment body. Then, a female thread is formed on the inner peripheral surface of the cylindrical portion so that it can be screwed into the male thread 33 of the back side member 31, and both the back side main body portion 32 of the back side member 31 and the cylindrical portion of the front side member 21 serve as first insertion portions to be inserted into the through hole 141 for the attachment body.

[0109] In this case, the front side member 21 and the rear side member 31 are integrated by screwing the male thread 33 of the rear side member 31 into the female thread of the cylindrical portion of the front side member 21 inside the attachment through hole 141. Furthermore, the side wall 13 is sandwiched between the front side flange 24 and the rear side flange 34 by screwing the male thread 33 of the rear side member 31 into the female thread of the cylindrical portion of the front side member 21, and the attachment 20 is attached to the side wall 13.

[0110] For the front side member 21, a cylindrical portion is extended from the front side flange 24 to the opposite side to the front side cylindrical portion 28. The outer diameter of this cylindrical portion is made smaller than the hole diameter of the attachment through hole 141 so that the cylindrical portion can be inserted into the attachment through hole 141. Then, a male thread is formed on the outer circumferential surface of the cylindrical portion.

[0111] The rear body portion 32 of the rear member 31 is removed, and the rear tubular portion 35 is extended in the axial direction of the rear member 31. Then, in the extended rear tubular portion 35, an inner tubular portion is formed on the rear flange 34 side, and a guide groove 35a is formed on the inner circumferential surface beyond the inner tubular portion. Also, a female thread is formed on the inner circumferential surface of the inner tubular portion.

[0112] When the attachment body 20 is attached to the side wall 13, the cylindrical portion of the front member 21 is inserted into the attachment body through hole 141. At this time, the cylindrical portion of the front member 21 protrudes from the inner surface 13b of the side wall 13, and the male thread provided on the cylindrical portion also protrudes from the inner surface 13b. Then, the female thread provided on the inner peripheral cylindrical portion of the back member 31 is screwed into the male thread provided on the cylindrical portion. This integrates the front member 21 and the back member 31. Furthermore, the female thread of the back member 31 is screwed into the male thread of the front member 21, so that the side wall 13 is sandwiched between the front flange 24 and the back flange 34, and the attachment body 20 is attached to the side wall 13.

[0113] When configured in this manner, the tubular portion of the front side member 21 serves as a first insertion portion to be inserted into the through hole 141 for the attachment. In the front member 21 , the front tube portion 28 may extend to a position beyond the mesh portion 25 at the second end 22 b of the front main body portion 22 .

[0114] The axial length of the exterior cylinder body 81 may be such that it protrudes from the side wall 13 of the underground concrete box 112 . When attaching the mounting body 20 to the underground concrete box 112, the insertion member 71 may be attached to the mounting body 20 in advance.

[0115] When attaching the attachment member 20 to the resin underground burial box 111, the insertion member 71 may be attached to the back member 31 in advance. The exterior cylinder body 81 does not have a uniform cross-sectional shape in the axial direction, and the shapes of the end openings 81d may be different. In this case, the attachment body 20 only needs to be attached to the inner circumferential surface of one of the end openings 81d by adhesion.

[0116] In the embodiment, the defining body is embodied as the side wall 13 that defines the space S of the underground buried box 11, but the defining body may also be a distribution box that is not buried in the ground but is fixed to a structure and exposed to the ground's surface, a side wall or bottom wall that defines the internal space of a wiring box, or even a building wall that defines a room in a building.

[0117] In the embodiment, the attachment body 20 is attached to the side wall 13 to provide a check valve on the side wall 13 of the underground burial box 11, but the attachment body 20 may also be attached to the side wall 13 to provide a connector on the side wall 13 for connecting an electrical conduit to the side wall 13 of the underground burial box 11.

[0118] In this case, the front member 21 is cylindrical and does not have a mesh portion 25. In the attachment 20 formed by screwing the front member 21 and the back member 31 together, the inner circumferential surface of the back body portion 32 of the back member 31 is exposed to the inside of the front member 21.

[0119] Then, a cylindrical connector is adhered to the inner peripheral surface of the back body 32 to integrate the connector with the attachment 20, and the electric conduit is connected to this connector. In this way, the electric conduit can be connected to the underground burial box 11 using the attachment 20 attached to the underground burial box 11.

[0120] In the embodiment, the mounting member 20 is attached to the side wall 13 of the underground burial box 11 . However, it may be attached to the bottom wall 12 of the underground burial box 11 . When either the front side member 21 or the back side member 31 is adhered to the large through hole 200 and the attachment body 20 is attached to the side wall 13, the front and back orientations are the same when attached to the side wall 13 by clamping, but the attachment body 20 may be adhered to the large through hole 200 with the front and back orientations reversed.

[0121] The technical ideas that can be understood from the above-described embodiment and modified examples will be described. (i) The thickness of the other defining body is such that the clamping mechanism cannot clamp the defining body between the front member and the back member, and the length of the second insertion portion in the insertion direction of the second insertion portion into the large through hole is shorter than the thickness of the other defining body.

[0122] (b) The attachment device is capable of adhering to the inner peripheral surface of at least one of the end openings formed at both axial ends of the outer tubular body. [Explanation of symbols]

[0123] R...flow passage, 13...side wall as defining body, 14...through hole, 20...attachment, 21...front member, 22...front main body portion as screw-mounting portion, 28...front tube portion as second insertion portion, 31...rear member, 32...rear main body portion as first insertion portion, 33...male screw, 100...attachment device, 141...through hole for attachment, 200...large through hole.

Claims

1. An attachment body that is attached to the defining body using a through hole provided in the defining body, A front side member is disposed on a front side of the defining body in a thickness direction, and a back side member is disposed on a back side of the defining body, At least one of the front side member and the rear side member includes a first insertion portion that is inserted into the through hole, and at least the other of the front side member and the rear side member includes a screw portion that is screwed into the first insertion portion, A clamping mechanism is provided for clamping the defining body between the front member and the rear member from both sides in a thickness direction while screwing the first insertion portion and the screw portion together, so that the attachment body can be attached to the defining body; In order to enable the attachment body to be attached to a demarcating body that is relatively thicker than the demarcating body and has a large through hole that is larger in the thickness direction than the through hole, at least one of the front side member and the back side member to which the first insertion portion and the screw portion are screwed includes a second insertion portion that can be inserted into the large through hole, An attachment body characterized by having an adhesive mechanism that enables the attachment body to be attached to another boundary body by adhering the outer surface of the second insertion portion to the boundary surface of the large through hole.

2. An attachment body that is attached to the defining body using a through hole provided in the defining body, A front side member is disposed on a front side of the defining body in a thickness direction, and a back side member is disposed on a back side of the defining body, At least one of the front side member and the rear side member includes a first insertion portion that is inserted into the through hole, and at least the other of the front side member and the rear side member includes a screw portion that is screwed into the first insertion portion, A clamping mechanism is provided for clamping the defining body between the front member and the rear member from both sides in a thickness direction while screwing the first insertion portion and the screw portion together, so that the attachment body can be attached to the defining body; In order to enable the attachment body to be attached to a demarcating body that is separate from the demarcating body and has a large through hole having an internal space relatively larger than that of the through hole, at least one of the front side member and the back side member to which the first insertion portion and the screw portion are screwed includes a second insertion portion that can be inserted into the large through hole, An attachment body characterized by having an adhesive mechanism that enables the attachment body to be attached to another boundary body by adhering the outer surface of the second insertion portion to the boundary surface of the large through hole.

3. 3. The attachment body according to claim 1 or claim 2, wherein the second insertion portion is provided on either the front member or the rear member, and the other of the front member and the rear member has an outer surface that is different in shape from the outer surface of the second insertion portion, and has an outer surface that cannot be adhered to the defining surface of the large through hole, or a shape that cannot be inserted into the large through hole.

4. a length of the first insertion portion in an insertion direction into the through hole is longer than a length of the through hole in the insertion direction, and a male screw is provided at a tip of the first insertion portion, The screw portion has a hollow cylindrical shape and the second insertion portion is provided on an outer periphery thereof.

3. The attachment body according to claim 1, wherein the screw portion has a female thread that is screwed into the male thread on an inner side that overlaps with the second insertion portion in the axial direction of the screw portion.

5. A flow passage is defined inside the attachment body, which communicates between the front side and the back side of the partition body when the first insertion portion and the screw portion are screwed together, and 3. The attachment body according to claim 1, further comprising a check valve disposed inside the attachment body for allowing liquid to flow through the flow passage in one direction and preventing the liquid from flowing in the opposite direction to the one direction.

6. An attachment body attached to a defining body having a through hole; a hollow cylindrical exterior cylinder body that defines the large through hole so that the exterior cylinder body can be attached to another defining body that has a large through hole having an internal space relatively larger than that of the through hole; The attachment is the attachment according to claim 1 or 2, An attachment device, characterized in that the axial length of the outer tubular body is longer than that of the first insertion portion and longer than that of the second insertion portion.

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