JP2002181261A - Bell-and-spigot pipe joint and riser piping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bell-and-spigot pipe joint capable of retaining a connecting pipe inserted into a joint body concentrically to the joint with satisfactory seal property. SOLUTION: This pipe joint having the joint body 10 for inserting the connecting pipe 1 to one end part thereof comprises a packing installation part 14 containing a packing 20 having a cylindrical part 25 and a rip 21 protruded to the bore side to support and seal the pipe, and a cylindrical guide part 12 smaller in diameter than the packing installation part 14 for supporting the circumferential surface of the pipe and regulating the inserting length of the pipe. The outer diameter Do of the packing installation part is set within the range of 1.1-1.35 times the outer diameter do of the connecting pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting a plurality of connection pipes by inserting a connection pipe into a joint body.
For example, the present invention relates to a plug-in type pipe joint suitable for use in a vertical pipe for rainwater drainage pipe of a building, and a vertical pipe structure using the same.

[0002]

2. Description of the Related Art As a conventional plug-in type pipe joint, there has been proposed a plug joint having a socket structure as described in Japanese Patent Publication No. 7-35872 in order to vertically pipe a water pipe substantially vertically. ing. As shown in FIG. 6, the receiving portion structure has a tongue piece 42 whose diameter is gradually reduced from the distal end portion to the inner depth portion at the opening-side distal end portion of the receiving portion 40. The inner peripheral surface 40a of the distal end portion, which is a receiving portion into which the connection pipe 1 is inserted and fitted via the sealing member 41 having a diameter of which is increased to hold the sealing member 41, becomes the distal end portion. And a curved surface that gradually bends inward in an arcuate shape as shown in FIG.

[0003]

According to the above-mentioned receiving port structure, when the connecting pipe 1 is inserted into the receiving section 40, the tongue piece 42 of the sealing member 41 comes into contact with the outer peripheral surface of the connecting pipe 1. Sealing can be performed reliably. However, although the seal member 41 is compressed, the connection pipe 1
Since there is no portion for centering and supporting the connecting pipe 1, when the connecting pipe 1 is obliquely inserted into the receptacle 40, the connecting pipe 1 is in an unstable state. For this reason, the connecting pipe 1 must be inserted into the receiving port 40 in a state where the connecting pipe 1 is held so as to be concentric with the receiving port 40, and the piping work becomes troublesome. When the connection pipe 1 is inserted, the end (edge) of the connection pipe 1 abuts against the inner surface of the inlet of the seal member 41 attached to the receiving portion 40, so that the tongue piece 42 of the seal member 41 is connected to the end of the connection pipe 1. However, there is a problem that the sealability is impaired in a long-term use. Further, since the receiving portion 40 has a considerably larger diameter than the connecting pipe 1, there is a problem that the joint occupies a large space.

[0004] In a vertical piping structure in which a plurality of connecting pipes are connected by using this kind of plug-in type pipe joint, a structure that is easy to construct and that is securely supported and fixed to a building is desired.

[0005] Accordingly, the present invention provides a pipe joint which solves the above-mentioned problems, and a connecting pipe inserted into a joint main body is held coaxially with the joint, and has a good sealing property. It is to provide a joint. Another object of the present invention is to provide a plug-in type pipe joint in which a connecting pipe inserted into the joint body is firmly held in the joint. It is another object of the present invention to provide a rigid piping structure in which a connecting pipe inserted into a joint body is securely fixed to a building.

[0006]

The plug-in type pipe joint according to the present invention is a pipe joint in which a connecting pipe is inserted into at least one end of a joint body. And a cylindrical guide portion for guiding the outer peripheral surface of the connection pipe with a smaller diameter than the packing mounting section and regulating the insertion length of the pipe, wherein the outer diameter Do of the packing mounting section is outside the connection pipe. 1.1 to 1.3 of diameter do
The packing is provided in a range of 5 times, and the packing mounting portion accommodates a packing having a tubular portion and a lip projecting toward the inner diameter side of the tubular portion, and is sealed with the outer peripheral surface of the connection pipe. I do. The number of the above lips may be one or plural, and may be selected according to the dimensions of the joint and the connecting pipe.

In the present invention, the thickness t of the cylindrical portion of the packing is provided in the range of 3 to 7% of the outer diameter do of the connecting pipe, and the inner peripheral surface of the cylindrical portion of the packing and the outer circumference of the connecting pipe are provided. The gap f with the surface is preferably provided in a range of 1 to 4% of the outer diameter do of the connection pipe. For example, if t is set in a range of 2 to 6 mm and f is set in a range of 1 to 3.5 mm. Good. The packing is the bending margin of the lip (h-f) where h is the height of the lip when the connecting pipe is not inserted, and Dp is
Outer diameter of packing attachment part, f: lip height when lip is bent when connecting pipe is inserted, f = [(Dp-2
t) -do] / 2} is preferably in the range of 15 to 50% of the height h of the lip when the connecting pipe is not inserted. The packing has a plurality of the lips, and a height h1 of a lip that first contacts the connection pipe is 1.0 to 1.3 times a height h2 of a lip that later contacts the connection pipe. It is preferably within the range. It is preferable that the packing further has an annular ridge formed in a circumferential direction on an outer peripheral surface of the cylindrical portion. It is preferable that the packing has an annular protrusion formed at an end of the cylindrical portion on a side where the connection pipe is inserted. It is preferable that the packing is provided with a circumferential ridge on an outer peripheral surface of the cylindrical portion.
The end of the packing mounting portion of the joint body may be bent in a tapered shape toward the connecting pipe, and the bent portion may be provided with a retaining ring that comes into contact with the annular protrusion and the tapered inner surface. Further, a screw hole may be provided in the packing mounting portion of the joint body, a bolt may be screwed into the screw hole, and the retaining ring may be provided so as to press against the outer peripheral surface of the connection pipe.

In the piping structure of the present invention, the plurality of connecting pipes connected via the plug-in type pipe joints extend along the height direction of the multi-storey building, and the lowest connecting pipe is the lowest. The connecting pipe fixed to the floor of the floor and higher than it is supported at at least one position between the top floor and the bottom floor.

[0009]

According to the present invention, a packing having a tubular portion and a lip protruding toward the inner diameter thereof is mounted on a packing mounting portion provided on the end side of the joint body for receiving the connection pipe. A tubular guide for guiding the outer peripheral surface of the connection pipe is provided at the inner back of the section. Therefore, when the connecting pipe is inserted into the joint, the outer peripheral surface of the connecting pipe is supported by the lip of the packing, and the connecting pipe passing through the lip is guided to the cylindrical guide portion and inserted to the back. For this reason, the piping work in which the joint body and the connection pipe are connected substantially concentrically can be performed with a simple operation of merely inserting the connection pipe into the joint.

In the present invention, since the outer diameter Do of the packing mounting portion is in the range of 1.1 to 1.35 times the outer diameter do of the connecting pipe, the entire joint is made compact, and the space required for piping is reduced. Can be reduced. In the present invention, when the thickness t of the cylindrical portion of the packing is in the range of 3 to 7% of the outer diameter do of the connecting pipe, the packing becomes difficult to peel off when the connecting pipe is inserted, and the lip is broken. Excessive surface pressure when bent can be effectively prevented. If the thickness t of the cylindrical portion is smaller than 3% of the outer diameter do of the connection pipe, the packing is easily peeled from the packing mounting portion, which is not preferable. When the gap f between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the connecting pipe is in the range of 1 to 4% of the outer diameter do of the connecting pipe, the lip is deformed with an appropriate sealing surface pressure, and packing is performed. Is difficult to peel off from the packing mounting portion. If the lip is excessively deformed (the tip of the lip approaches or comes into contact with the inner peripheral surface of the cylindrical portion), the packing tends to peel off, which is not preferable. Also, the lip compression allowance (h−f) ｆprovided that
h: height of the lip portion when the connection pipe is not inserted, Dp: outer diameter of the packing mounting portion, f: height at which the lip is bent when the connection pipe is inserted, f = [(Dp-2t) -do] / If 2｝ is in the range of 15 to 50% of the lip height h when the connecting pipe is not inserted, the insertion load when inserting the connecting pipe into the joint becomes moderate (1.0 kN or less), and Even in a non-fixed state, a good sealing property is maintained by an appropriate surface pressure. For example, as a result of a leak test using water pressure, no leak failure occurred even when a water pressure of 0.1 MPa was applied to the inside of the joint in which the connecting pipe was inserted.

Further, the packing has an inner diameter larger than the inner diameter on the opening side of the packing mounting portion, and has an annular protrusion protruding toward the opening side, so that damage to the packing can be greatly reduced. This is because, when the connecting pipe is inserted into the joint body at an angle when the connecting pipe is inserted into the opening of the packing mounting portion, the end of the connecting pipe hits the annular projection and is not inserted any more, so that the connecting pipe is not directly inserted. This is because the end does not directly hit the packing.

By providing at least one annular ridge on the outer peripheral surface of the packing, the cylindrical portion of the packing is more strongly compressed, and the outer peripheral surface of the cylindrical portion of the packing and the inner peripheral surface of the packing mounting portion of the joint body are formed. Improves the adhesion of
The sealing performance is improved. Further, the inner surface of the bent portion at the end of the joint body is tapered, and the end surface of the annular projecting portion of the packing is brought into contact with this inner surface. Furthermore, since it is further compressed, it is tightly sealed to the connecting pipe and sealed, and the outer peripheral surface of the connecting pipe is held by packing to prevent pull-out. In particular, when the end surface of the annular projection is a tapered surface that comes into contact with the bent portion, the connection pipe can be held more strongly. Further, by providing a retaining ring in the packing mounting portion of the joint body, which comes into contact with the tapered inner surface of the bent end portion of the joint body together with the packing, when the pulling force acts on the connection pipe, the diameter of the retaining ring is reduced by the tapered inner surface. Since the outer peripheral surface of the connection pipe is locked, a stronger pull-out preventing force acts. Also, a screw hole is provided in the packing mounting part so as to press the outer peripheral surface of the retaining ring, a bolt is screwed into it, and after the connection pipe is completely inserted and tightened the bolt, the retaining ring becomes large. The diameter is reduced and bites into the outer peripheral surface of the connecting pipe, and the pull-out preventing force acts more reliably in combination with the diameter reducing action by the tapered surface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing a first embodiment of the plug-in type pipe joint of the present invention, and FIG. 2 is an enlarged view of the waist of FIG. In the present embodiment, the joint body 10 is made of a steel pipe made of, for example, a corrosion-resistant material (such as stainless steel) as a raw pipe, and is subjected to plastic processing such as bulging and drawing, and further surface treatment such as painting as necessary. Is formed. In particular, when water containing dirt flows, a good aesthetic appearance can be provided by applying a color tone coating that can cover the dirt. The central part 11 of the main body has an outer diameter as it is a raw pipe, and a cylindrical guide of a predetermined length for guiding the outer peripheral surface of the connecting pipe formed on both ends thereof by expanding the raw pipe. A part 12 is provided. The length L of the cylindrical guide portion 12 is set according to the diameter of the connection pipe 1. In the present embodiment, the length L is set within a range of about 15 to 30 mm. It is desirable that the inner diameter match the inner diameter of the connecting pipe. It should be noted that a slight deviation (several mm or less) may be practically acceptable. However, if the inner diameter of the main body central portion 11 is largely deviated from the inner diameter of the connection pipe, foreign matters such as dirt accumulate at the boundary portion, which is not preferable. The connection pipe 1 inserted into the joint body 10 is connected to the end of the cylindrical guide 12 and the center 1.
1 and comes into contact with the tube abutting portion 13 formed at the step portion, and is not inserted any more. Note that, in order to easily insert the connecting pipe, the cylindrical guide portion 12 is set so that its inner diameter is slightly larger than the outer diameter of the connecting pipe (for example, a gap of about 1 to several mm between them). Is formed.

At the end of the cylindrical guide portion 12 on the side where the connection pipe is inserted, a packing mounting portion 14 is formed, which is further enlarged by one step to mount the lip packing 20. In this embodiment, the outer diameter Do of the packing mounting portion 14 is set to be 1.2 times the outer diameter do of the connection pipe 1. The inlet end of the packing mounting portion 14 is bent so as to form an opening having an inner diameter (Di) slightly smaller than the inner diameter (d1) of the cylindrical portion 25 of the packing 20, and the inner peripheral surface of the bent portion 16 has It is formed on the tapered inner surface 15 whose diameter gradually decreases toward the tip.

The lip packing 20 has a cross-sectional shape as shown in the right side of FIG. 1 and as shown in FIG. 3 in an unconstrained state (when the connection pipe is not inserted). Two lips 21, 21 are provided which gradually decrease in diameter toward the back and protrude toward the axis. The number of lips is not limited to two, but may be one or three or more.
The inner peripheral surfaces 22 at both ends of the lip packing 20 are
It has an inner diameter (d1) larger than the inner diameter (Di) of the opening of the bent portion 16 so that the connection pipe 1 can be inserted. An annular projection 23 projecting in the axial direction from the end face of the cylindrical portion 25 is provided with a bent portion 16 formed at an end of the packing mounting portion 14.
And the end face of the protruding portion 23 is formed in a tapered shape as shown in FIG. As described above, the inner peripheral surface 22 of the annular projecting portion 23 is
4 is larger than the inner diameter Di of the opening, and the lip 21 protrudes so as to abut the outer peripheral surface of the connection pipe 1 inserted with a margin. In addition, the contact pressure to the connecting pipe 1 is increased, and the compression deformation rate is reduced, so that the sealing property and the packing life can be improved.

The inner diameter (d2) of the lip 21 is smaller than the outer diameter (do) of the connecting pipe 1, and the lip 21 is bent by the insertion of the connecting pipe 1 as shown in FIG. The outer peripheral surface of the connection pipe 1 is sealed by contact. In particular, the inner peripheral surface 22 of the annular projecting portion 23 is larger than the inner diameter (Di) of the opening, and the connecting tube 1 is smoothly guided and inserted into contact with the lip 21 by the opening and the inner peripheral surface 22 of the lip packing. It is inserted into the cylindrical guide 12 while being held concentrically with the main body. Since the lip 21 is appropriately bent by the insertion of the connection pipe 1, the lip packing 2
The excessive compression of 0 is alleviated, and good sealing properties are maintained over a long period of time.

In the present invention, it is desirable that the dimensions of each part of the lip 21 satisfy the following conditions. (1) Lip 2 close to the side where the connection pipe is inserted (entrance side)
1 is the height h2 of the lip behind it.
Is preferably in the range of 1.0 to 1.3 times. This is because when h2 is larger than h1, the connecting pipe hardly passes through the lip on the back side, and when h1 exceeds 1.3 times h2, the connecting pipe hardly passes through the lip on the inlet side. . (2) Height f at which lip is bent when connecting pipe is inserted
{However, it is desirable to have a size that satisfies f = [(Dp−2t) −do] / 2} ≧ bend width w of the lip portion. This is because if f is smaller than w, the bent portion of the lip is strongly sandwiched between the connecting pipe and the joint body, the contact surface pressure becomes too high, the required insertion force of the connecting pipe increases, and the connecting pipe increases. This makes it difficult to insert the (3) It is desirable that the lip interval l ≧ the compression allowance h−f of the lip portion. This is because if l <h−f, when the lip portions are bent, the lip portions overlap, the contact surface pressure becomes too high, the required insertion force of the connection tube increases, and the connection tube is inserted deeply. This is because it becomes difficult.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the plug-in type pipe joint according to the present invention. In the present embodiment, as shown in FIG.
A lip packing 20 having an annular protruding portion 23 'formed in a small-diameter step portion from the end of the lip packing 20 is provided with a retaining ring 30. The retaining ring 30 has a tapered outer surface that abuts between the rear end side of the annular protrusion 23 ′ of the lip packing 20 and the tapered inner surface 15 of the bent portion of the packing mounting portion 14 of the main body. A saw-toothed biting tooth 32 is provided which is engaged with the outer peripheral surface of the connection pipe 1. When the pull-out force acts on the connecting pipe 1 inserted into the joint body, the retaining ring 30 is cut into a part of the circumference of the retaining ring (not shown) so that the diameter of the retaining ring 30 can be expanded and reduced on the tapered inner surface 15. ) Is provided. Further, as shown in FIG. 3, since the annular ridge 24 is provided on the outer peripheral surface of the lip packing 20, the annular ridge 24 is more strongly compressed than other portions, and the adhesion between the lip packing and the joint body is improved. Reliable sealing performance is guaranteed.

Further, a screw hole 16 is formed in the bent portion of the end of the packing mounting portion 14, and a bolt 17 is screwed to press the tapered outer surface of the retaining ring 30.
The screw holes 16 and the bolts 17 may be provided at one location on the circumference of the packing mounting portion 14, or may be provided at a plurality of locations. By providing the bolts 17 for further pressing the retaining ring 30 in this manner, the retaining ring 30 is securely digged into the outer peripheral surface of the connecting pipe 1, the pull-out preventing force of the connecting pipe 1 is increased, and the connecting pipe 1 is connected. Can be held firmly.

FIG. 5 is a schematic view showing one embodiment of a rigid piping structure using the plug-in type pipe joint of the present invention. Multiple connecting pipes 1
Are connected via a plug-in fitting 2, each connecting pipe 1 is fixed to the floor 3 of each floor by a fixing fitting 4, and is supported in the middle of each floor by a steady rest fitting 5 (or supported for each connecting pipe). May be supported). According to this piping structure, it is sufficient to simply insert the connecting pipe into the joint, the construction is simple, and the pipe is firmly supported. In FIG. 5, when the connecting pipe 1 penetrates the floor, it is not necessary to support all of the connecting pipe 1 with the steady rest 5, but may be supported at one place every several floors. Only the connection pipe on the lowest floor needs to be fixed to the floor 3.

[0021]

As described above, the plug-in type pipe joint of the present invention is
The outer peripheral surface of the inserted connection pipe is supported by a packing having a specific shape, and the connection is performed while the connection pipe is supported concentrically with the joint body. Therefore, there is no possibility that the connection pipe is easily bent with respect to the joint body, the pipe is centered reliably, and a good sealing property is secured. In addition, the packing lip can be prevented from being damaged, and good sealing properties can be secured over a long period of time. In addition, the connection tube is reliably prevented from being pulled out. Further, according to the plug-in type pipe joint of the present invention, the workability of various pipes such as rainwater drainage and drain pipes of an air conditioner can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a plug-in type pipe joint of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a diagram showing an unconstrained state of packing used in the present invention.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the plug-in type pipe joint of the present invention.

FIG. 5 is a schematic sectional view showing one embodiment of the piping structure of the present invention.

FIG. 6 is a cross-sectional view showing a socket structure of a conventional pipe joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Connecting pipe 2 Plug-in type pipe joint 3 Floor 4, 4 '
Fixing metal 5 Steady metal 6 Cap 10 Joint body 11 Center part of main body 12 Cylindrical guide part 13 Pipe butting part 14 Packing mounting part 15 Tapered inner surface of bent part 16 Screw hole 17 Bolt 20 Packing 21 Lip 22 Guide peripheral surface 23, 23 '
Annular protruding part 25 Protrusion 30 Retaining ring 31 Tapered outer surface 32 Biting teeth

Claims (9)

[Claims] 1. A pipe joint in which a connecting pipe is inserted into at least one end of a joint main body, wherein the joint main body has a packing mounting part on an insertion side of the pipe, and then has a diameter smaller than that of the packing mounting part. A cylindrical guide portion for guiding the outer peripheral surface and regulating the insertion length of the pipe; and an outer diameter Do of the packing mounting section is equal to 1.1 of an outer diameter do of the connection pipe.
The packing is provided in a range of 1 to 1.35 times, and the packing mounting portion accommodates a packing having a tubular portion and a lip projecting to the inner diameter side of the tubular portion, and is sealed with the outer peripheral surface of the connection pipe. A plug-in type pipe joint characterized by the above-mentioned. 2. The packing according to claim 1, wherein a thickness t of the tubular portion is in a range of 3 to 7% of an outer diameter do of the connecting pipe, and an inner circumferential surface of the tubular portion of the packing and an outer circumferential surface of the connecting pipe are provided. Gap f
The plug-in type pipe joint according to claim 1, wherein the pipe is provided in a range of 1 to 4% of an outer diameter do of the connection pipe. 3. The packing has a bent margin (hf) of the lip, where h is the height of the lip when the connecting pipe is not inserted, Dp is the outer diameter of the packing mounting section, and f is the connecting pipe. Lip height when the lip is bent when inserting
3. The plug-in type according to claim 1, wherein [(Dp-2t) -do] / 2} is provided in a range of 15 to 50% of a height h of the lip when the connecting pipe is not inserted. Pipe fittings. 4. The packing has a plurality of the lips, and a height h1 of a lip that first contacts the connection pipe.
The plug-in type pipe joint according to any one of claims 1 to 3, wherein the plug is provided in a range of 1.0 to 1.3 times the height h2 of a lip that comes into contact with the connection pipe later. . 5. The packing according to claim 1, wherein the packing has an annular protrusion formed at an end of the cylindrical portion on a side where the connection pipe is inserted. Plug-in type pipe fitting. 6. The plug-in type pipe joint according to claim 1, wherein the packing is provided with a circumferential ridge on an outer peripheral surface of the cylindrical portion. 7. An end of a packing mounting portion of the joint main body is bent in a tapered shape toward the connecting pipe, and a stopper ring is mounted on the bent portion so as to abut on the annular projection and the tapered inner surface. The plug-in type pipe joint according to any one of claims 1 to 6, wherein 8. A joint mounting part of the joint body is provided with a screw hole, a bolt is screwed into the screw hole, and the retaining ring is pressed against the outer peripheral surface of the connection pipe. 7. The plug-in type pipe joint according to 7. 9. A plurality of connecting pipes connected via the plug-in type pipe joint according to any one of claims 1 to 8 extend along a height direction of a multi-storey building, and have the lowest order. A vertical piping structure characterized in that the connecting pipe is fixed to the floor on the lowest floor and the connecting pipe higher than that is supported at at least one position between the top floor and the lowest floor.