JP7704553B2 - Sealing member, container, piping system, and method for installing piping system - Google Patents

Description

The present invention relates to a sealing member , a bucket, a piping system, and a method for installing a piping system .

Conventionally, a sealing member is known that seals between a sewer manhole body (manhole body) having an opening on its outer surface and a pipe arranged in the opening of the sewer manhole body (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 10-037295

However, the sealing member of Patent Document 1 requires a large insertion force when inserting the pipe into the sealing member. There is room for improvement in this sealing member.

The present invention has been made in consideration of these problems, and aims to provide a sealing member that reduces the insertion force required when inserting piping, a bucket and piping system equipped with this sealing member , and a construction method for a piping system in which this sealing member is installed .

In order to solve the above problems, the present invention proposes the following means.
The sealing member of the present invention is a sealing member that seals between a box body portion having an opening formed on its outer surface and a piping placed in the opening of the box body portion, and comprises: an annular member; a large diameter portion provided on one side of an inner surface of the annular member along a central axis of the annular member; a small diameter portion provided on the other side of the inner surface of the annular member along the central axis than the large diameter portion and having an inner diameter smaller than that of the large diameter portion; and a step portion formed so as to connect between the large diameter portion and the small diameter portion, wherein the inner diameter of the sealing member is constant or decreases from the one end to the other end, the inner diameter of the sealing member at the one end is larger than the inner diameter of the sealing member at the other end, and in a cross section including the central axis, the inner surface of the step portion has a curved shape that is convex radially outward .

In this invention, the sealing member is fixed to the periphery of the opening in the masu main body with the other side facing the inside of the masu main body. A pipe is inserted into the annular member of the sealing member from the outside of the masu main body. The pipe passes through the large diameter portion, and the tip of the pipe engages with the step portion connecting the large diameter portion and the small diameter portion. Since the inner diameter of the small diameter portion is smaller than the inner diameter of the large diameter portion, when the pipe engages with the inner peripheral surface of the step portion, the small diameter portion is pushed radially outward from the step portion as a center, and the inner diameter of the small diameter portion becomes larger. The amount of change in the inner diameter of the small diameter portion increases toward the other side. This makes it easier to insert the pipe into the small diameter portion.
Therefore, the insertion force required when inserting the pipe into the sealing member can be reduced.
In addition, when the sealing member is manufactured by injection molding using a mold, the inner peripheral surface of the sealing member does not have any undercut portions, so that the inner peripheral surface of the sealing member is entirely formed by the core of the mold, and the core can be pulled out to one side from the sealing member.
In addition, when the piping is inserted along the inner surface of the step portion at a constant speed, the rate at which the inner diameter of the small diameter portion increases can be made faster when the piping moves from the inner surface of the step portion to the inner surface of the small diameter portion than when the piping is initially engaged with the inner surface of the step portion.
This allows the inner diameter of the smaller diameter portion to be increased carefully initially, and then the inner diameter of the smaller diameter portion to be increased quickly.

In the sealing member, an inner circumferential surface of the large diameter portion and an inner circumferential surface of the stepped portion may be smoothly connected in the cross section.
Here, smoothly continuing means that in the cross section, the angle between a tangent to the end of the inner surface of the large diameter portion on the step portion side and a tangent to the end of the inner surface of the step portion on the large diameter portion side is 10° or less.
In this invention, the inner diameter of the small diameter portion does not change even when the pipe is inserted into the sealing member, and switching is smoothly performed from the process of inserting the end of the pipe into the large diameter portion to the process of inserting the end of the pipe into the step portion, where the inner diameter of the small diameter portion increases as the pipe is inserted. Therefore, when the inner diameter of the small diameter portion starts to increase, a sudden increase in the inner diameter of the small diameter portion can be suppressed.

In the sealing member, in the cross section, a connection portion between an inner circumferential surface of the stepped portion and an inner circumferential surface of the small diameter portion may protrude radially inwardly so as to be convex.
In this invention, the tip of the pipe can be more reliably engaged with the inner circumferential surface of the step portion.

Moreover, the sealing member of the present invention is a sealing member for sealing between a box body portion having an opening formed on its outer surface and a piping placed in the opening of the box body portion, and comprises: an annular member; a large diameter portion provided on an inner surface of the annular member at one side along a central axis of the annular member; a small diameter portion provided on an inner surface of the annular member at another side along the central axis than the large diameter portion and having an inner diameter smaller than that of the large diameter portion; a step portion formed to connect between the large diameter portion and the small diameter portion; and a convex portion provided on the inner surface of the small diameter portion and protruding radially inward, the inner diameter of the sealing member being constant or decreasing from the one end to the other end, and the inner diameter of the sealing member at the one end being larger than the inner diameter of the sealing member at the other end.

In this invention, the sealing member is fixed to the periphery of the opening in the masu main body with the other side facing the inside of the masu main body. A pipe is inserted into the annular member of the sealing member from the outside of the masu main body. The pipe passes through the large diameter portion, and the tip of the pipe engages with the step portion connecting the large diameter portion and the small diameter portion. Since the inner diameter of the small diameter portion is smaller than the inner diameter of the large diameter portion, when the pipe engages with the inner peripheral surface of the step portion, the small diameter portion is pushed radially outward from the step portion as a center, and the inner diameter of the small diameter portion becomes larger. The amount of change in the inner diameter of the small diameter portion increases toward the other side. This makes it easier to insert the pipe into the small diameter portion.
Therefore, the insertion force required when inserting the pipe into the sealing member can be reduced.
In addition, when the sealing member is manufactured by injection molding using a mold, the inner peripheral surface of the sealing member does not have any undercut portions, so that the inner peripheral surface of the sealing member is entirely formed by the core of the mold, and the core can be pulled out to one side from the sealing member.
Furthermore, when the outer peripheral surface of the pipe comes into contact with the protrusion, the outer peripheral surface of the pipe is separated from the portion of the inner peripheral surface of the small diameter portion that is adjacent to the protrusion in the direction along the central axis. This reduces the contact area between the small diameter portion and the pipe compared to a case in which the inner peripheral surface of the small diameter portion is not provided with a protrusion and the outer peripheral surface of the pipe comes into contact over the entire length of the inner peripheral surface of the small diameter portion in the direction along the central axis. This further reduces the insertion force required to insert the pipe into the sealing member.

The container of the present invention is characterized in that it comprises any one of the sealing members described above, and a container body portion in which the annular member of the sealing member is fixed to the peripheral portion of the opening in the container body portion.
In this invention, the bucket can be constructed using a sealing member that reduces the insertion force required when inserting the piping.
The piping system of the present invention is characterized in that the above-described measure and a horizontal pipe are connected via any one of the above-described sealing members.

In addition, the construction method of the piping system of the present invention is characterized by having the steps of forming an opening in a box, installing a sealing member described above in the opening, and inserting a horizontal pipe into the opening.

The sealing member , bucket, piping system, and installation method for a piping system of the present invention can reduce the insertion force required when inserting a pipe.

1 is a diagram showing a schematic configuration of a rainwater bucket according to one embodiment of the present invention used in a house. FIG. FIG. 3 is a cross-sectional view taken along line A1-A1 in FIG. 2. 4 is a half cross-sectional view of a sealing member of the rainwater bucket. FIG. FIG. 6 is an enlarged view of a main part in FIG. 5 . FIG. 7 is an enlarged view of part A3 in FIG. 6. FIG. 7 is an enlarged view of part A4 in FIG. 6. 10 is a cross-sectional view illustrating a process of inserting a horizontal rainwater pipe into the sealing member. FIG. 10 is a cross-sectional view illustrating a process of inserting a horizontal rainwater pipe into the sealing member. FIG. 10 is a cross-sectional view illustrating a process of inserting a horizontal rainwater pipe into the sealing member. FIG.

Hereinafter, one embodiment of a bucket according to the present invention will be described with reference to Figs. 1 to 11, in which the bucket is a rainwater bucket.
As shown in Fig. 1, the rainwater bucket 1 of this embodiment is connected to a downspout 101 of a house (building) 100 via a curved pipe section 102 and a horizontal rainwater pipe (piping) 103A. The rainwater bucket 1 is buried in the ground G together with the curved pipe section 102, the horizontal rainwater pipe 103A, etc. The rainwater bucket 1 is further connected to a sewer pipe (not shown) via a horizontal rainwater pipe (piping) 103B.
In the following description, when there is no need to distinguish between the horizontal rainwater pipes 103A and 103B, they will be collectively referred to as the horizontal rainwater pipe 103. The same applies to the openings 12A and 12B and the position indicators 14A, 14B, and 14C, which will be described later.

The horizontal rainwater pipes 103 are arranged along a horizontal plane with an appropriate water gradient. The horizontal rainwater pipes 103 and the rainwater bucket 1 constitute a rainwater piping system 2.
On the other hand, sewage generated in drainage equipment 106 such as a toilet located inside the house 100 is drained from a vertical pipe 107 through a horizontal drainage pipe 108 and into a main sewer pipe 109 via a confluence manhole or the like not shown.

For example, the horizontal rainwater pipe 103A is a pipe with a nominal diameter of 50 (outer diameter of 60 mm). The horizontal rainwater pipe 103B is a pipe with a nominal diameter of 75 (outer diameter of 89 mm). A hard polyvinyl chloride pipe is preferably used as the material for the horizontal rainwater pipe 103. The horizontal rainwater pipes 103A and 103B have different outer diameters.
In addition to the horizontal rainwater pipes 103A and 103B, a pipe having a nominal diameter of 100 (outer diameter of 114 mm) (not shown) is used as the horizontal rainwater pipe 103. These horizontal rainwater pipes 103 having nominal diameters of 50, 75, and 100 are pipes intended for use in the rainwater tank 1.

As shown in Figures 2 and 3, the rainwater bucket 1 comprises a bucket main body 10, a riser pipe receiving port 25 arranged on the upper part of the bucket main body 10, a mud collection section 30 arranged on the lower part of the bucket main body 10, a locking section 40 arranged on the riser pipe receiving port 25, a basket 45 arranged in the mud collection section 30, and sealing members 50A, 50B of this embodiment.
The box body 10, the riser pipe receiving port 25, and the locking portion 40 are each formed in a cylindrical shape, and the mud reservoir 30 and the basket 45 are each formed in a cylindrical shape with a bottom. The axes of the box body 10, the riser pipe receiving port 25, the mud reservoir 30, the locking portion 40, and the basket 45 are arranged on a common axis O1. Hereinafter, the direction perpendicular to the axis O1 is referred to as the radial direction, and the direction going around the axis O1 is referred to as the circumferential direction. The radial direction is the radial direction of the box body 10, etc.
The rainwater bucket 1 is disposed with its axis O1 extending in the vertical direction.

The manhole main body 10 comprises a main body outer wall 11 having openings 12A, 12B formed on its outer surface in which the ends of the horizontal rainwater pipe 103 are positioned, and a connecting portion 13 connected to the riser pipe receiving port 25.
The main body outer peripheral wall 11 is formed in a cylindrical shape. As shown in Fig. 3, the openings 12A, 12B are formed on the main body outer peripheral wall 11 so as to face each other across the axis O1. The detailed position where the opening 12 is formed will be described later. Note that the opening 12 is not formed in the rainwater bucket 1 when the rainwater bucket 1 is manufactured, and the opening 12 is formed in the rainwater bucket 1 at the construction site as described later.

2 and 3, a plurality of (three in this embodiment) position indicators 14A, 14B, 14C, a plurality of outer diameter indicators 15A, 15B, 15C, and a plurality of angle indicators 16A, 16B, 16C are formed on the outer peripheral surface of the main body outer peripheral wall 11. The numbers of the position indicators 14, the outer diameter indicators 15, and the angle indicators 16 formed are not particularly limited.
The position indicator 14 indicates the vertical position of the center of the openings 12A, 12B. In this embodiment, the position indicator 14 is an annular reference line extending in the circumferential direction. The position indicator 14 is formed around the entire circumference of the main body outer peripheral wall 11. For example, the position indicator 14 is formed as a groove recessed from the outer circumferential surface of the main body outer peripheral wall 11 toward the inside in the radial direction.
The shape of the position indicator 14 is not limited to a groove shape, and may be formed as a protrusion or the like protruding radially outward from the outer circumferential surface of the main body outer wall 11 .

The position indicators 14 are arranged at intervals from one another in the vertical direction. Among the position indicators 14A, 14B, and 14C, the position indicator 14A is arranged at the top and the position indicator 14C is arranged at the bottom. The position indicator 14B is arranged between the position indicators 14A and 14C.
The vertical distance between the position index 14 and the locking portion 40 will be described later.

The outer diameter indicator 15 indicates the outer diameter of the horizontal rainwater pipe 103. In this example, the outer diameter indicator 15 is the nominal diameter of the horizontal rainwater pipe 103. The nominal diameter of the horizontal rainwater pipe 103 corresponds to the outer diameter of the horizontal rainwater pipe 103. For example, the outer diameter indicator 15A is 50 in nominal diameter, which indicates an outer diameter of 60 mm. The outer diameter indicator 15B is 75 in nominal diameter, which indicates an outer diameter of 89 mm.
In addition, the outer diameter indicator 15 is not limited to the nominal diameter of the horizontal rainwater pipe 103, but may be the outer diameter of the horizontal rainwater pipe 103, etc.
Outer diameter indexes 15A, 15B, and 15C are disposed beside position indexes 14A, 14B, and 14C corresponding to outer diameter indexes 15A, 15B, and 15C, respectively. More specifically, outer diameter index 15A is disposed immediately above position index 14A. Outer diameter indexes 15B and 15C are disposed immediately above position indexes 14B and 14C, respectively.
It is preferable that the outer diameter index 15A is disposed at a position where the correspondence with the position index 14A can be easily understood. For this reason, it is preferable that the outer diameter index 15A is disposed close to the position index 14A or disposed on the position index 14A. The same is true for the outer diameter indexes 15B and 15C.

The multiple angle indicators 16A represent circumferential positions of the position indicator 14A.
As shown in Figures 2 and 4, in this embodiment, the multiple angle indicators 16A are recesses formed on the position indicator 14A. The multiple angle indicators 16A are formed at equal angles around the axis O1. The multiple angle indicators 16A are formed on the position indicator 14A. Note that some of the multiple angle indicators 16 are removed from the main body outer peripheral wall 11 when forming the opening 12. Note that in Figure 4, the removed angle indicators 16A are indicated by a two-dot chain line M1.
In this example, at the time of manufacture, angular indicators 16A are formed at 45 degree intervals around the axis O1, and eight angular indicators 16A are formed on the outer peripheral surface of the main body outer wall 11.
The multiple angular indicators 16B and 16C are formed in the same manner as the multiple angular indicators 16A.
The multiple angle indicators 16A, 16B, 16C are arranged so that their circumferential positions are aligned. That is, in a plan view of the rainwater bucket 1, the positions of the angle indicators 16B, 16C coincide with the position of the angle indicator 16A.

The opening 12A has a circular shape when viewed from the side opposite the opening 12A. As shown in Fig. 3 and Fig. 4, the inner diameter of the opening 12A is larger than the outer diameter of the horizontal rainwater pipe 103A. An end of the horizontal rainwater pipe 103A is disposed in the opening 12A.
The center of the circle of the opening 12A coincides with the center of the position indicator 14A in the vertical direction. As shown in Fig. 4, in this example, the center of the circle of the opening 12A coincides with one of the multiple angle indicators 16A (hereinafter, also referred to as angle indicator 16A1). As described above, angle indicator 16A1 is removed from the main body outer peripheral wall 11 when forming the opening 12A.

The opening 12B has a circular shape when viewed from the side opposite the opening 12B. As shown in Fig. 3 and Fig. 4, the inner diameter of the opening 12B is larger than the outer diameter of the horizontal rainwater pipe 103B. An end of the horizontal rainwater pipe 103B is disposed in the opening 12B.
The center of the circle of the opening 12B coincides with the center of the position index 14B in the up-down direction. As shown in Fig. 4, in this example, the center of the circle of the opening 12B coincides with one of the multiple angle indexes 16B (hereinafter also referred to as angle index 16B1). When the rainwater bucket 1 was manufactured, the angle index 16B1 was an index that was arranged to face the angle index 16A1 among the multiple angle indexes 16B. As described above, the angle index 16B1 was removed from the main body outer peripheral wall 11 when the opening 12B was formed.

In the plan view shown in FIG. 4 , the rainwater horizontal pipe 103A and the rainwater horizontal pipe 103B are connected in a straight line by the rainwater bucket 1 .
For example, the horizontal rainwater pipe 103B may be disposed at the position indicated by the two-dot chain line M2 in Fig. 4, and the horizontal rainwater pipe 103A and the horizontal rainwater pipe 103B may be connected by the rainwater bucket 1 so as to bend the flow of rainwater by 90 degrees. The opening for this horizontal rainwater pipe 103B is formed around the angle index 16B located at the circumferential center between the angle index 16A1 and the angle index 16B1 in a plan view.
By using the angle indicator 16 in this manner, the opening 12 can be easily formed in the main body outer peripheral wall 11 with its center at a position that divides the entire circumference of the main body outer peripheral wall 11 into multiple parts.

As shown in FIG. 3, the connecting portion 13 is formed in a circular ring shape. The connecting portion 13 extends radially inward from the upper end of the main body outer peripheral wall 11. The connecting portion 13 is formed around the entire circumference of the main body outer peripheral wall 11.

The riser pipe receiving port 25 includes a pipe body 26 and a receiving member 27 .
The pipe body 26 is formed in a cylindrical shape and is disposed coaxially with the axis O1. The outer diameter of the pipe body 26 is smaller than the inner diameter of the body outer peripheral wall 11. The inner peripheral edge of the connecting portion 13 is connected to a middle portion of the axis O1 on the outer peripheral surface of the pipe body 26. The receiving member 27 is formed in an annular shape. The receiving member 27 extends from the lower end of the pipe body 26 toward the inside in the radial direction.
The internal space of the riser pipe receiving port 25 and the internal space of the box body 10 are in communication with each other.
A riser pipe 115 is connected to the riser pipe receiving port 25. The riser pipe 115 is arranged along the vertical direction, and the lower end of the riser pipe 115 is arranged inside the pipe body 26. The lower surface of the riser pipe 115 contacts the receiving member 27, and the riser pipe 115 is supported from below by the receiving member 27.

The mud reservoir 30 is formed in a cylindrical shape with a bottom. The mud reservoir 30 is disposed coaxially with the axis O1. The outer diameter of the mud reservoir 30 is smaller than the inner diameter of the main body outer peripheral wall 11. The internal space of the mud reservoir 30 and the internal space of the bucket main body 10 are in communication with each other.
A connecting portion 31 is fixed to the mud reservoir portion 30. The connecting portion 31 includes a flange portion 32 and a connecting piece 33.
The flange portion 32 is formed in an annular shape and extends radially outward from the upper end of the mud reservoir portion 30.
The connecting piece 33 is formed in a cylindrical shape. The connecting piece 33 extends downward from the radially outer end of the flange portion 32. The connecting piece 33 is disposed within the lower end of the main body outer peripheral wall 11 and is fixed to the main body outer peripheral wall 11 with an adhesive or the like.
In plan view, the mud reservoir portion 30 is disposed within the outer edge of the bucket main body portion 10 (main body outer peripheral wall 11).

The locking portion 40 is formed in a cylindrical shape and is disposed coaxially with the axis O1. That is, the locking portion 40 is disposed over the entire circumference around the axis O1. A radially outer surface 40a of the locking portion 40 is a curved surface parallel to the axis O1.
The outer diameter of the locking portion 40 and the outer diameter of the mud reservoir portion 30 are approximately the same. The locking portion 40 extends downward from the inner peripheral edge of the receiving member 27. The locking portion 40 is disposed on the receiving member 27 so as to be located above the position indicator 14. The locking portion 40 is disposed within the box body portion 10, radially inward of the main body outer peripheral wall 11.
The vertical position of the lower end of the engaging portion 40 is constant regardless of the circumferential position.

For each position index 14 , the vertical distance between the vertical center of the position index 14 and the locking portion 40 is smaller than half the outer diameter of the horizontal pulling tube 103 represented by the outer diameter index 15 corresponding to the position index 14 .
Specifically, the vertical distance LA between the vertical center of the position indicator 14A and the locking portion 40 is smaller than half the outer diameter (60 mm) of the horizontal pulling tube 103A represented by the outer diameter indicator 15A corresponding to the position indicator 14A. That is, the distance LA is a value smaller than 30 mm, for example, 25 mm. The distance LA is smaller than the radius of the horizontal pulling tube 103A disposed in the opening 18a.
The vertical distance LB between the vertical center of the position indicator 14B and the locking portion 40 is smaller than half the outer diameter (89 mm) of the horizontal pulling tube 103B indicated by the outer diameter indicator 15B corresponding to the position indicator 14B. In other words, the distance LB is a value smaller than 44.5 mm, for example, 40 mm.
The same is true for the distance LC corresponding to the position indicator 14C.

Of the distances LA, LB, and LC, the minimum distance LA is smaller than the radius of the horizontal rainwater pipe 103A, which has the smallest outer diameter among the horizontal rainwater pipes 103. The horizontal rainwater pipes 103 are in contact with the surfaces 40a of the engagement portions 40.
In this embodiment, the locking portion 40 is disposed at the riser pipe receiving port 25, but as shown by the two-dot chain line M4 in Fig. 3, the locking portion may be disposed at the flange portion 32 of the connecting portion 31. In this case, the locking portion 40 is disposed so as to be located lower than the position indicator 14.
Furthermore, the locking portion may be disposed on either the bucket main body portion 10 or the mud reservoir portion 30.

The length L1 in the vertical direction of the engaging portion 40 is preferably equal to or less than the thickness L2 of the wall of the horizontal rainwater pipe 103A arranged in the opening 12A. It is more preferable that the length L1 is equal to or less than the thickness of the wall of the horizontal rainwater pipe 103 having the thinnest wall among the multiple horizontal pipes 103.
The length of the rainwater horizontal pipe 103 arranged inside the box body 10 is preferably 150 mm or less. In other words, the length of the horizontal pipe 103 arranged inside the box body 10 when the horizontal pipe 103 contacts the surface 40a of the engagement portion 40 is preferably 150 mm or less.

The basket 45 is for carrying out soil, sand, leaves, etc., accumulated in the rainwater bucket 1 from inside the rainwater bucket 1 to the outside. The basket 45 includes a container body 46 and a handle 47.
The container body 46 is formed in a cylindrical shape with a bottom, and is disposed within the mud reservoir portion 30 .
The handle 47 is formed, for example, in a shape obtained by curving an axial member so as to be convex upward. Each longitudinal end of the handle 47 is connected to the upper end of the container body 46. The upper end of the handle 47 reaches the receiving member 27 of the riser pipe receiving port 25. The outer diameter of the basket 45 is preferably 50 mm or more.
The outer diameter of the basket 45 is smaller than the inner diameters of the riser pipe receptacle 25 and the locking portion 40. The basket 45 can be removed upward from the mud collector 30 and taken out of the rainwater bucket 1 through the bucket body 10 and the riser pipe receptacle 25.

The box body 10, the riser pipe receiving port 25, and the locking portion 40 are integrally formed from a resin material, such as polyvinyl chloride or polypropylene, that can be cut by the hole-opening means described below.
The mud basin 30 and the basket 45 can be formed from the same material as the bucket body 10 and the like.
It is preferable that the outer diameter of the rainwater bucket 1, i.e., the outer diameter of the bucket body 10, is 350 mm or less.

3 and 4, the sealing member 50A is fixed to the peripheral portion of the opening 12A in the main body 10. Similarly, the sealing member 50B is fixed to the peripheral portion of the opening 12B in the main body 10. The sealing members 50A and 50B differ only in their outer diameter and inner diameter. Specifically, the outer diameter of the sealing member 50B is larger than the outer diameter of the sealing member 50A, and the inner diameter of the sealing member 50B is larger than the inner diameter of the sealing member 50A. The sealing member 50A will be described below.
The sealing member 50A provides a seal between the outer wall 11 of the bucket body 10 and the horizontal rainwater pipe 103A.

5 and 6, the sealing member 50A has an annular member 51A, a large diameter portion 52A, a small diameter portion 53A, a step portion 54A, a protruding portion 55A, a first flange portion 56A, and a second flange portion 57A. Also shown in Fig. 5 is a mold 120 used when manufacturing the sealing member 50A by injection molding.
The annular member 51A, the large diameter portion 52A, the small diameter portion 53A, the step portion 54A, and the protrusion 55A are each formed in an annular shape.
Here, the central axis of the annular member 51A is referred to as the central axis O3. One side of Fig. 5 shows a cross section of the sealing member 50A taken along a plane including the central axis O3. In the following description of the sealing member 50A, the direction perpendicular to the central axis O3 is referred to as the radial direction, and the direction going around the central axis O3 is referred to as the circumferential direction.
6, the outer circumferential surface of the annular member 51A on the other side D2 along the central axis O3 is a tapered surface 51aA that is inclined so as to gradually decrease in diameter toward the other side D2. Hereinafter, the side opposite the other side D2 in the direction along the central axis O3 will be referred to as the one side D1.

The large diameter portion 52A, the small diameter portion 53A, and the stepped portion 54A are disposed on the inner circumferential surface of the annular member 51A and are coaxial with the central axis O3.
The large diameter portion 52A is provided on one side D1 of the inner circumferential surface of the annular member 51 A. A curved surface 52aA is formed on the end of the one side D1 of the large diameter portion 52A, and is curved so as to be convex toward the direction between the one side D1 and the radially inner side.
The small diameter portion 53A is provided on the inner circumferential surface of the annular member 51A, in a portion closer to the other side D2 than the large diameter portion 52A. The inner diameter of the small diameter portion 53A (the largest portion of the inner diameter of the small diameter portion 53A) is smaller than the inner diameter of the large diameter portion 52A (the smallest portion of the inner diameter of the large diameter portion 52A). In this embodiment, the inner diameter of the small diameter portion 53A gradually decreases toward the other side D2.

As shown in Fig. 7, the step portion 54A is formed so as to be continuous between the large diameter portion 52A and the small diameter portion 53A. In the cross section shown in Fig. 7, the inner circumferential surface of the step portion 54A is curved and convex toward the radially outward side.
The inner peripheral surface of the large diameter portion 52A and the inner peripheral surface of the step portion 54A are smoothly connected. "Smoothly connected" here means that in the cross section, an angle between a tangent line L5 at the end of the inner peripheral surface of the large diameter portion 52A on the step portion 54A side and a tangent line L6 at the end of the inner peripheral surface of the step portion 54A on the large diameter portion 52A side is 20° or less. The angle also includes 0°. It is more preferable that the angle be 10° or less.
A connection portion 60A between the inner peripheral surface of the stepped portion 54A and the inner peripheral surface of the small diameter portion 53A protrudes radially inward so as to be convex.
6 and 8, the protrusion 55A is provided at a middle portion of the inner circumferential surface of the small diameter portion 53A in a direction along the central axis O3. The protrusion 55A protrudes radially inward. The cross-sectional shape of the protrusion 55A is triangular with a pointed radially inward side.

As shown in FIGS. 5 and 6, the first flange portion 56A and the second flange portion 57A are each formed in an annular shape.
The flanges 56A, 57A are disposed coaxially with the central axis O3 on the outer circumferential surface of the annular member 51A. The first flange 56A is disposed at the end of one side D1 on the outer circumferential surface of the annular member 51A. The surface of the first flange 56A facing the other side D2 is flat. A curved surface 56aA is formed at the radially outer end of the surface of the first flange 56A facing the one side D1, and is curved to be convex toward the direction between the one side D1 and the radially outer side.
The second flange 57A is disposed on the other side D2 of the first flange 56A. The second flange 57A is disposed in the middle of the annular member 51A in the direction along the central axis O3. The outer diameter of the second flange 57A is smaller than the outer diameter of the first flange 56A. This makes it easier to insert the second flange 57A into the opening 12A of the box body 10.
The surface of the second flange 57A facing the one side D1 is flat. A curved surface 57aA is formed at the radially outer end of the surface of the second flange 57A facing the other side D2, and is curved so as to be convex toward the direction between the other side D2 and the radially outer side.

The annular member 51A is a member that is the sealing member 50A excluding the large diameter portion 52A, the small diameter portion 53A, the step portion 54A, the protrusion portion 55A, the first flange portion 56A, and the second flange portion 57A.

The inner diameter of the sealing member 50A configured as described above is constant or decreases from the one side D1 to the other side D2. In other words, the inner diameter of the sealing member 50A changes without increasing from the one side D1 to the other side D2.
8, the outer edge 55aA of the other side D2 of the protrusion 55A is parallel to the central axis O3 or approaches the central axis O3 as it moves toward the other side D2. When the outer edge 55aA is parallel to the central axis O3, the inner diameter of the sealing member 50A is constant in the range in which the outer edge 55aA is provided in the direction along the central axis O3. When the outer edge 55aA approaches the central axis O3 as it moves toward the other side D2, the inner diameter of the sealing member 50A gradually decreases from the one side D1 to the other side D2.
As shown in FIG. 6, the inner diameter at the end on one side D1 of the sealing member 50A (the end on one side D1 of the large diameter portion 52A) is larger than the inner diameter at the end on the other side D2 of the sealing member 50A (the end on the other side D2 of the small diameter portion 53A).

The sealing member 50A is made of an elastomer or the like.
The sealing member 50A may be made of synthetic rubber such as styrene-butadiene rubber (SBR).
In general, elastomers are harder (less likely to deform) than synthetic rubbers. When the sealing member 50A is manufactured by injection molding using an elastomer, it is difficult to provide an undercut portion in the sealing member 50A because the elastomer is relatively hard.

5, the annular member 51A of the sealing member 50A is fixed to the peripheral edge of the opening 12A in the main body outer peripheral wall 11 of the box body 10. Specifically, the sealing member 50A is disposed such that the other side D2 faces the inside of the box body 10, and the first flange 56A and the second flange 57A sandwich the peripheral edge of the opening 12A in the main body outer peripheral wall 11.
As shown in Figs. 3 and 4, an end of a horizontal rainwater pipe 103A is disposed within the sealing member 50A.
Similarly, the sealing member 50B is fixed to the peripheral edge of the opening 12B in the outer wall 11 of the box body 10. An end of a horizontal rainwater pipe 103B is disposed within the sealing member 50B.

Next, a process for manufacturing the sealing member 50A will be described.
For example, the sealing member 50A is manufactured by injection molding using a metal mold. As shown in FIG.
The core 121 forms the shape of the inner peripheral surface side of the sealing member 50A.
The cavity 122 is divided into a first cavity 122A and a second cavity 122B by a dividing plane S including the central axis O3.
After the sealing member 50A is molded by injection molding using the mold 120, the core 121 is extracted to one side D1 from the sealing member 50A. The cavities 122A and 122B are extracted from the sealing member 50A in a direction perpendicular to the dividing plane S.
Through the above steps, the mold 120 is removed from the sealing member 50A, and the sealing member 50A is manufactured.

Next, a method of constructing the rainwater bucket by connecting the horizontal rainwater pipe 103 to the rainwater bucket 1 during manufacture will be described.
First, in the hole making process (step S1), an opening 12 is formed at a desired circumferential position in the bucket body 10 of the rainwater bucket 1 using a hole making means such as a hole saw. At this time, a position index 14 and an angle index 16 that are the center of the opening 12 are determined according to the outer diameter of the horizontal rainwater pipe 103 that is connected to the rainwater bucket 1 and the direction in which the horizontal rainwater pipe 103 is connected.
For example, when a horizontal rainwater pipe 103A having a nominal diameter of 50 and a horizontal rainwater pipe 103B having a nominal diameter of 75 are connected in a straight line to the rainwater bucket 1, with the rainwater bucket 1 in between, openings 12A and 12B are formed as follows.

That is, the center of the vertical direction of the position index 14A corresponding to the outer diameter index 15A representing the nominal diameter 50 is selected as the center of the opening 12A to be formed in the main body outer peripheral wall 11. At this time, if the position of the angle index 16A1, which is one of the multiple angle indexes 16A, is selected, the positioning in the circumferential direction becomes easy. The tip of a drill of a hole-making means such as a hole saw having an outer diameter larger than 60 mm (e.g., 70 mm) is placed on the position on the angle index 16A1 of the position index 14A. The hole-making means is rotated around the drill as an axis by an impact driver or the like to form the opening 12A in the main body outer peripheral wall 11.
As the center of the opening 12B to be formed in the outer peripheral wall 11 of the main body, the center in the vertical direction of the position index 14B corresponding to the outer diameter index 15B indicating the nominal diameter 75 is selected. At this time, when the position of the angle index 16B1, which is one of the multiple angle indexes 16B, is selected, the opening 12B is formed to face the opening 12A.
When the hole opening step S1 is completed, the process proceeds to step S2.

Next, in the piping process (step S2), the rainwater horizontal pipe 103A is inserted into the opening 12A, and the rainwater horizontal pipe 103B is inserted into the opening 12A.
Before inserting the rainwater horizontal pipe 103, the sealing members 50A and 50B are fixed to the openings 12A and 12B, respectively. At this time, it is preferable to apply a lubricant to the inner peripheral surfaces of the sealing members 50A and 50B. Then, the rainwater horizontal pipe 103A is inserted into the sealing member 50A, and the rainwater horizontal pipe 103B is inserted into the sealing member 50A. The process of inserting the rainwater horizontal pipe 103A into the sealing member 50A will be described in detail later.
When the piping process S2 is completed, all the processes of the rainwater bucket construction method are completed, and the rainwater horizontal pipe 103 is connected to the rainwater bucket 1.

Here, the process of inserting the rainwater horizontal pipe 103A into the sealing member 50A will be described in detail.
As shown in Fig. 9, the rainwater horizontal pipe 103A is inserted into the annular member 51A of the sealing member 50A from the outside of the basin body 10. The rainwater horizontal pipe 103A passes through the large diameter portion 52A, and as shown in Fig. 10, the tip of the rainwater horizontal pipe 103A engages with the step portion 54A connected between the large diameter portion 52A and the small diameter portion 53A. Since the inner diameter of the small diameter portion 53A is smaller than the inner diameter of the large diameter portion 52A, when the rainwater horizontal pipe 103A engages with the inner peripheral surface of the step portion 54A, the small diameter portion 53A is pushed outward in the radial direction around the step portion 54A, and the inner diameter of the small diameter portion 53A becomes larger. The amount of change in the inner diameter of the small diameter portion 53A becomes larger toward the other side D2. This makes it easier to insert the rainwater horizontal pipe 103A into the small diameter portion 53A.
Therefore, in the sealing member 50A of this embodiment, it is possible to reduce the insertion force required when inserting the rainwater horizontal pipe 103A into the sealing member 50A.

7, the inner peripheral surface of the step portion 54A is curved and convex toward the outside in the radial direction. Therefore, when the rainwater horizontal pipe 103A is inserted at a constant speed along the inner peripheral surface of the step portion 54A, the speed at which the inner diameter of the small diameter portion 53A increases can be made faster when the rainwater horizontal pipe 103A moves from the inner peripheral surface of the step portion 54A to the inner peripheral surface of the small diameter portion 53A than when the rainwater horizontal pipe 103A is initially engaged with the inner peripheral surface of the step portion 54A.
This allows the inner diameter of the small diameter portion 53A to be increased carefully at first, and then the inner diameter of the small diameter portion 53A to be increased quickly.

In the cross section, the inner circumferential surface of the large diameter portion 52A and the inner circumferential surface of the step portion 54A are smoothly connected. Therefore, even if the rainwater horizontal pipe 103A is inserted into the sealing member 50A, the inner diameter of the small diameter portion 53A does not change, and the process of inserting the tip of the rainwater horizontal pipe 103A into the large diameter portion 52A smoothly switches to the process of inserting the tip of the rainwater horizontal pipe 103A into the step portion 54A, in which the inner diameter of the small diameter portion 53A increases as the rainwater horizontal pipe 103A is inserted. Therefore, when the inner diameter of the small diameter portion 53A starts to increase, the inner diameter of the small diameter portion 53A can be prevented from suddenly increasing.

In the cross section, the connection portion 60A between the inner peripheral surface of the stepped portion 54A and the inner peripheral surface of the small diameter portion 53A protrudes radially inward to form a convex shape, so that the tip of the horizontal rainwater pipe 103A can be more reliably engaged with the inner peripheral surface of the stepped portion 54A.
The sealing member 50A has a convex portion 55A. As shown in FIG. 11, when the outer circumferential surface of the horizontal rainwater pipe 103A contacts the convex portion 55A, the outer circumferential surface of the horizontal rainwater pipe 103A is separated from the portion of the inner circumferential surface of the small diameter portion 53A adjacent to the convex portion 55A in the direction along the central axis O3. Therefore, the contact area between the small diameter portion 53A and the horizontal rainwater pipe 103A is reduced compared to the case where the convex portion 55A is not provided on the inner circumferential surface of the small diameter portion 53A and the outer circumferential surface of the horizontal rainwater pipe 103A contacts the inner circumferential surface of the small diameter portion 53A over the entire length in the direction along the central axis O3. Therefore, the insertion force required to insert the horizontal rainwater pipe 103A into the sealing member 50A can be further reduced.

The inner diameter of the sealing member 50A is constant or decreases from one side D1 to the other side D2. Therefore, when the sealing member 50A is manufactured by injection molding using a mold 120, there is no undercut portion on the inner peripheral surface of the sealing member 50A. Therefore, the entire inner peripheral surface of the sealing member 50A is formed by the core 121 of the mold 120, and the core 121 can be pulled out of the sealing member 50A to the one side D1.
The rainwater bucket 1 of this embodiment includes the bucket body 10 and the sealing member 50A. Therefore, the rainwater bucket 1 can be constructed using the sealing member 50A that reduces the insertion force required to insert the rainwater horizontal pipe 103A.

Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and changes, combinations, deletions, etc. of the configuration are also included within the scope that does not deviate from the gist of the present invention.
For example, in the above embodiment, the number of openings 12 formed in the box body 10 may be one, or three or more.
In the cross section shown in FIG. 7, the inner peripheral surface of the step portion 54A may be linear or the like.
In the cross section, there may be a step between the inner circumferential surface of the large diameter portion 52A and the inner circumferential surface of the stepped portion 54A.
In the cross section, the connection portion between the inner peripheral surface of the step portion 54A and the inner peripheral surface of the small diameter portion 53A may be smoothly continuous.

The sealing member may not have the protrusion 55A, the first flange 56A, and the second flange 57A. In this case, for example, the sealing member is fixed to the periphery of the opening 12A in the box body 10 by an adhesive or the like.
The sealing member may have an undercut portion formed therein. The rainwater bucket 1 does not have to include the pipe receiving port 25, the mud collecting portion 30, the engaging portion 40, and the basket 45.
In this embodiment, the bucket is a rainwater bucket 1, but the bucket may be a sewage bucket for sewage (dirty water, drainage) or the like.

1 Rain water sho (sho)
10: box body 12A, 12B: opening 50A, 50B: sealing member 51A: annular member 52A: large diameter portion 53A: small diameter portion 54A: step portion 55A: protrusion 60A: connection portion D1: one side D2: other side O3: central axis

Claims (7)

A sealing member that seals between a box body having an opening formed on an outer surface thereof and a pipe disposed in the opening of the box body,
An annular member;
a large diameter portion provided on an inner peripheral surface of the annular member on one side along a central axis of the annular member;
a small diameter portion provided on an inner circumferential surface of the annular member at a portion on the other side along the central axis than the large diameter portion, the small diameter portion having an inner diameter smaller than that of the large diameter portion;
a step portion formed so as to be continuous between the large diameter portion and the small diameter portion;
Equipped with
an inner diameter of the sealing member is constant or decreases from the one end to the other end;
an inner diameter of the sealing member at the one end is larger than an inner diameter of the sealing member at the other end;
A sealing member , wherein in a cross section including the central axis, an inner circumferential surface of the step portion has a curved shape that is convex radially outward . The sealing member according to claim 1 , wherein in the cross section, an inner circumferential surface of the large diameter portion and an inner circumferential surface of the step portion are smoothly connected to each other. The sealing member according to claim 1 or 2 , wherein in the cross section, a connection portion between an inner circumferential surface of the step portion and an inner circumferential surface of the small diameter portion protrudes radially inward so as to be convex. A sealing member that seals between a box body having an opening formed on an outer surface thereof and a pipe disposed in the opening of the box body,
An annular member;
a large diameter portion provided on an inner peripheral surface of the annular member on one side along a central axis of the annular member;
a small diameter portion provided on an inner circumferential surface of the annular member at a portion on the other side along the central axis than the large diameter portion, the small diameter portion having an inner diameter smaller than that of the large diameter portion;
a step portion formed so as to be continuous between the large diameter portion and the small diameter portion;
a protrusion provided on an inner circumferential surface of the small diameter portion and protruding radially inward;
Equipped with
an inner diameter of the sealing member is constant or decreases from the one end to the other end;
A sealing member, wherein an inner diameter of the sealing member at the one end is greater than an inner diameter of the sealing member at the other end. A sealing member according to any one of claims 1 to 4 ,
a box body having the annular member of the sealing member fixed to a peripheral portion of the opening in the box body;
A measuring cup equipped with a measuring device. A measuring cup according to claim 5;
A horizontal pipe and
A piping system connected via a sealing member according to any one of claims 1 to 4. forming an opening in the box;
placing a sealing member according to any one of claims 1 to 4 in the opening;
Inserting a cross-draw tube into the opening;
The construction method of the piping system includes the steps of:

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