JP2012193790A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of simplifying mounting work when a main pipe with annular ribs is a mounting object.SOLUTION: The pipe joint 10 is used to connect a branch pipe having a diameter equal to or larger than that of the main pipe to the main pipe having many annular ribs, and has a saddle part 11 provided with a plurality of rib grooves 13 and an opening 14. A pipe connection part 12 is protruded from the peripheral edge of the opening 14. The peripheral edge of the opening 14 is shaped like a track formed by connecting a pair of circles of the same diameter by a pair of tangent lines extending in parallel to the axial line of the main pipe with the centers of the circles separated from each other by a predetermined distance along the axial line. The longitudinal width of the opening 14 is set to width that enables each center of the pair of circles to be located approximately at the center between the annular ribs of the main pipe. The pipe connection part 12 has a cylindrical neck part 16 corresponding to the shape of the opening 14 and a pipe receiving part 17 formed in a perfectly cylindrical shape.

Description

  The present invention relates to a pipe joint for connecting a main pipe and a branch pipe in a pipe such as a sewage pipe, for example, and in particular, a pipe used for a pipe having a large number of annular ribs arranged in parallel on the outer peripheral surface thereof. Related to fittings.

In general, in a sewer pipe, it is common to ensure a smooth water flow by setting the inner diameter of the main pipe to be larger than the inner diameter of the branch pipe and increasing the flow rate of the main pipe to that of the branch pipe. However, due to various reasons such as securing the site and the positional relationship with other buried pipes, the main pipe with a small diameter must be used. On the other hand, the inner diameter of the branch pipe is determined by the standard. There is a case where a branch pipe having an inner diameter equal to or larger than the inner diameter is used.
A pipe joint described in Patent Document 1 is provided as a connection between the main pipe as described above and a branch pipe having an inner diameter equal to or larger than the inner diameter of the main pipe. This pipe joint is composed of a pipe connection portion being proffered the saddle portion and the saddle portion, root tips lateral direction width d ₂ of the tube connecting portion is smaller than the diameter d ₁ of the main tube, longitudinal direction width d ₄ is set to be larger than the diameter d ₃ of the branches tube. That is, the pipe joint is provided with an oval opening at the root end of the pipe connection portion to connect to the main pipe, and the width d ₂ in the short direction of the pipe connection portion is determined from the diameter d ₁ of the main pipe. by also small, while preventing decrease in strength of the opening portion provided in the main pipe in correspondence with the opening, the longitudinal width d ₄ was larger than the diameter d ₃ of the lateral pipe, opening the opening of the By making the area equal to or larger than the opening area of the branch pipe, the water flow is kept smooth.
The opening provided in the main pipe corresponding to the opening of the pipe joint is first drilled with a hole saw so that a pair of circles are aligned along the axis of the main pipe on the peripheral wall of the main pipe, and then The peripheral wall remaining between the pair of circles is formed by cutting along a pair of tangents parallel to the axis of the main pipe connecting the pair of circles.

JP 2001-188791 A

However, the conventional pipe joint does not assume the use of a main pipe with an annular rib, and there is a problem that the operation becomes difficult when the main pipe with the annular rib is an attachment target.
That is, some of the main pipes have a large number of annular ribs arranged in parallel on the outer peripheral surface thereof in order to ensure strength, rigidity, etc. against the influence of earth pressure. When forming an opening corresponding to the opening of the conventional pipe joint with respect to the main pipe with such an annular rib, the annular rib becomes an obstacle when drilling with a hole saw, and the center of a pair of circles It is difficult to determine. In particular, if the center of the circle is placed on or close to the annular rib as a result of matching with the opening of the pipe joint, the hole will be displaced with a high probability when drilling with a hole saw. You will have to start over.
The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a pipe joint that can simplify the work when a main pipe with an annular rib is an attachment target.

As a means for solving the above-mentioned conventional problems, the pipe joint invention according to claim 1 is equal in diameter to the main pipe in which a large number of annular ribs are arranged in parallel on the outer peripheral surface. A pipe joint used when connecting a branch pipe having a diameter larger than that of the main pipe, comprising a saddle portion to be deposited on an outer peripheral surface of the main pipe, and the annular rib is accommodated in the saddle portion. A plurality of rib grooves and an opening, and a pipe connecting portion for connecting the branch pipe is provided from the periphery of the opening, and the periphery of the opening The shape is a pair of semi-circular ellipses formed by a pair of circles having the same diameter and having their centers separated from each other by a predetermined distance along the axis of the main pipe and connected by a pair of tangents extending parallel to the axis. The track is shaped like a mold, and the opening has a width shorter than the inner diameter of the main pipe. The center of each of the pair of circles that bear both ends of the track shape in a state where the width is set and the saddle portion is placed on the outer peripheral surface of the main pipe while accommodating the annular rib in the rib groove Each of which is positioned at a substantially central position between the annular ribs of the main pipe, and the longitudinal width is set to be longer than the inner diameter of the branch pipe. The gist of the present invention is that it has a cylindrical neck portion corresponding to the shape of the tube and a tube receiving portion having a true cylindrical shape corresponding to the shape of the branch pipe.
According to a second aspect of the present invention, in the pipe joint invention according to the first aspect, in the neck portion, in the vicinity of the end portion on the saddle portion side, the longitudinal width of the inner peripheral edge is larger than the longitudinal width of the opening portion. The gist is that a reduced diameter portion set to have a short width is provided.
According to a third aspect of the present invention, in the pipe joint invention according to the first or second aspect, the saddle portion indicates the position of each center of the pair of circles that bear both ends of the track shape. The gist is that means are provided.
According to a fourth aspect of the present invention, in the pipe joint invention according to any one of the first to third aspects, a recess is formed on the outer peripheral surface of the saddle portion along the circumferential direction of the main pipe. It is provided so that it extends and is opened to the outside at the end that reaches the periphery of the saddle portion, and the wire used for fixing to the main pipe is wound around the recess Is the gist.
The gist of the invention according to claim 5 is the pipe joint invention according to claim 4, wherein the recess is arranged at a position closest to the neck of the pipe connecting portion.
A sixth aspect of the present invention is the pipe joint according to any one of the first to fifth aspects of the present invention, wherein the tube receiving portion extends with the axis intersecting the neck. The gist is that it is bent as described above.

[Action]
According to the pipe joint of claim 1, the saddle part of the pipe joint is provided with a plurality of rib grooves, and when the saddle part is deposited on the outer peripheral surface of the main pipe with an annular rib, The annular rib is received in the rib groove. For this reason, the pipe joint prevents the saddle portion from floating from the outer peripheral surface of the main pipe due to the obstruction of the annular rib, and the axial direction of the main pipe from the mounting position set on the main pipe. It is suppressed that the position shifts.
In order to send the water flow from the branch pipe to the main pipe, the opening provided in the saddle portion of the pipe joint of the present invention has a track shape with a semicircular oval shape at both ends, and is short. The width is set to be shorter than the inner diameter of the main pipe, and the longitudinal width is set to be longer than the inner diameter of the branch pipe. Accordingly, the opening portion provided in the main pipe corresponding to the opening has a shorter width than the inner diameter of the main pipe, so that a decrease in strength of the main pipe is suppressed, and the longitudinal width is smaller than the inner diameter of the branch pipe. Since it is long, the opening area becomes equal to or larger than the opening area of the branch pipe, and a smooth water flow is maintained.
The track shape of the opening portion is formed by connecting a pair of circles having the same diameter with a pair of tangent lines extending in parallel to the axis line, with their centers separated from each other by a predetermined distance along the axis line of the main pipe. Is. In such a track-like opening, the longitudinal width bears both ends of the track-like shape in a state where the saddle portion is placed on the outer peripheral surface of the main pipe while the annular rib is accommodated in the rib groove. The centers of the pair of circles are set so as to be positioned approximately at the center between the annular ribs of the main pipe. That is, the main pipe is provided with a track-like opening portion so as to have a shape corresponding to the opening portion. When the track-like opening portion is formed, first, a pair of circles at both ends are respectively formed with a hole saw. Perforated. And since the shape of this opening part respond | corresponds to this opening part, the center of this hole saw is defined in the approximate center between annular ribs at the time of the drilling by the said hole saw. Therefore, the annular rib does not get in the way when drilling with the hole saw, and the drilling operation using the hole saw can be simplified.
Further, the pipe connecting portion provided in the pipe joint has a cylindrical neck portion corresponding to the track-shaped opening and a pipe receiving portion having a true cylindrical shape corresponding to the shape of the branch pipe. Therefore, it is not necessary to prepare an adapter for changing the mouth shape in order to connect a generally cylindrical branch pipe that is generally used, and the branch pipe can be easily connected. It is like that.
According to the pipe joint according to claim 2, by providing a reduced diameter portion having a width that is shorter than the longitudinal width of the opening at the end of the neck on the saddle portion side, Since the longitudinal width of the outer peripheral edge can be reduced at the end of the neck, the wire can be wound near the neck of the neck, the peripheral edge of the opening of the saddle part, and the opening of the main pipe Since the crimping with the peripheral edge of the portion becomes strong, it is possible to suppress the occurrence of problems such as so-called “single float” in which one side floats with respect to the main pipe.
According to the pipe joint according to claim 3, by providing the indicating means for indicating the positions of the centers of the pair of circles that bear both ends of the track shape, the center of the hole saw is determined when drilling with the hole saw. Marking etc. become easy. Further, when placing the pipe joint on the main pipe, the opening of the pipe joint can be easily and quickly aligned with the opening of the main pipe by matching the indicating means with the markings made on the surface of the main pipe. can do.
According to the pipe joint of the fourth aspect of the present invention, there is provided a concave line around which a wire used for fixing to the main pipe is wound, and the end of the concave line is opened to the outside. Generation | occurrence | production of malfunctions, such as floating with an unevenness | corrugation, can be suppressed, and also a contractor can grasp | ascertain now the suitable winding position of a wire.
Further, as in the pipe joint according to claim 5, the neck of the neck can be firmly fixed by arranging the concave streak in the position closest to the neck of the pipe connecting portion. Occurrence of a problem called “single float” can be suitably suppressed.
According to the pipe joint according to claim 6, when connecting the branch pipe extending from the lateral direction to the main pipe by bending the pipe receiving portion with respect to the neck portion, the connection direction of the pipe is changed. It is not necessary to prepare an elbow or the like for carrying out the operation, and the labor involved in connecting the branch pipes can be reduced, which is particularly useful when the main pipe is buried at a shallow position from the ground.

〔effect〕
According to the pipe joint of the present invention, it is possible to simplify the operation when a main pipe with an annular rib is set as an attachment target.

The front view which fractured | ruptured a part which shows the pipe joint of embodiment. The side view which shows the pipe joint of embodiment. The top view which shows the pipe joint of embodiment. The bottom view which shows the pipe joint of embodiment. (A) is explanatory drawing which shows the opening part of a pipe joint, (b) is explanatory drawing which shows the opening part of a main pipe. (A) is a sectional side view which shows the use condition of a pipe joint, (b) is sectional drawing in the BB line of Fig.5 (a). Explanatory drawing which shows the state which looked at the pipe joint of embodiment from the axial direction of the pipe socket part. Explanatory drawing which shows the state which put the pipe joint temporarily in the main pipe. Explanatory drawing which shows the state which gave marking to the main pipe. Explanatory drawing which shows the state which drilled a pair of circle in the main pipe. Explanatory drawing which shows the state which formed the opening part in the main pipe.

Hereinafter, the embodiment which materialized the pipe joint of the present invention is described.
The pipe joint 10 of this embodiment is for connecting the branch pipe 2 to the main pipe 1 (see FIG. 6). In addition, an opening 4 is formed on the peripheral wall of the main pipe 1 at a position where the pipe joint 10 is attached in order to ensure a water flow with the branch pipe 2 via the pipe joint 10.
Here, the said main pipe 1 used as the attachment object of the pipe joint 10 of this invention has the some annular rib 3 arranged in parallel by the outer peripheral surface. About this main, rib interval P, rib height HR, rib width ES, etc. are prescribed | regulated according to the nominal diameter by the standard (JSWAS K-13-2003) of Japan Sewerage Association. For example, according to the above standard, if the main pipe has a nominal diameter of 150 mm, the rib interval P is 19.1 mm as a reference dimension.
In addition, the branch pipe 2 to which the pipe joint 10 of the present invention is attached has the same diameter as the main pipe or a larger diameter than the main pipe, and has a substantially true cylindrical shape like a general pipe material, Other than the above, the size and material are not particularly limited. Here, the above-mentioned diameter indicates a nominal diameter, and unless otherwise specified in the present specification, nominal diameter≈approximate internal diameter.
And the inner diameter of the main pipe 1 and phi _M, if the inner diameter of the branch pipe 2 and phi _S, and phi _M and phi _S, a relationship of φ _M ≦ φ _S.

As shown in FIGS. 1 to 4, the pipe joint 10 includes a saddle part 11, and a pipe connection part 12 for connecting the branch pipe 2 is extended from the saddle part 11. .
The saddle portion 11 is formed in an arcuate arch shape with a curvature matching the outer peripheral surface of the main tube 1 so as to be deposited on the outer peripheral surface of the main tube 1. The inner surface of the saddle portion 11 accommodates the annular rib 3 provided in the main pipe 1 so that the saddle portion 11 can be stably attached to the main pipe 1. Is recessed.
An opening 14 is provided in a substantially central portion of the saddle portion 11. The pipe connecting portion 12 rises from the periphery of the opening 14 on the outer surface of the saddle portion 11 so as to surround the opening 14 inside.
On the inner surface of the saddle portion 11, an annular protrusion 15 is extended from the periphery of the opening 14 so as to surround the opening 14 inside thereof. The annular projecting portion 15 is formed so as to extend the peripheral wall of the pipe connecting portion 12. The annular protrusion 15 is inserted into the opening 4 when the pipe joint 10 is attached to the main pipe 1. The annular projecting portion 15 inserted into the opening portion 4 suppresses the displacement of the pipe joint 10 with respect to the main pipe 1 and ensures the connection of the pipe connecting section 12 to the main pipe 1. To suppress water leakage.

The tube connecting portion 12 has a cylindrical neck portion 16 provided on the base end side (saddle portion 11 side) and a tube receiving portion 17 provided on the distal end side.
The pipe receiving portion 17 is for connecting the branch pipe 2 by inserting the branch pipe 2 therein, and is formed in a true cylindrical shape corresponding to the shape of the branch pipe 2. Yes. In the tube receiving portion 17, the inner end surface connected to the neck portion 16 is tapered so that the inner peripheral surface thereof is reduced in diameter toward the neck portion 16 side, thereby being inserted into the tube receiving portion 17. A locking step 18 for receiving the end face of the branch pipe 2 is provided. Further, a rubber ring 19 is fitted on the inner peripheral surface of the tip opening in the tube receiving portion 17, and the rubber ring 19 connects the inner peripheral surface of the tube receiving portion 17 and the branch pipe 2. It is comprised so that the clearance gap formed between outer peripheral surfaces may be filled up and a water leak may be suppressed.

The pipe socket 17, so the axis AX ₁ intersects the axis line AX ₂ of the neck portion 16 is provided by bending against該首portion 16 (see FIG. 2).
According to the Japan Sewerage Association Standard (JSWAS K-1), the flow from the branch pipe 2 to the main pipe 1 is not obstructed and the backflow from the main pipe 1 to the branch pipe 2 is prevented. Therefore, the attachment range of the pipe joint 10 to the main pipe 1 is determined so that the lower end of the inner surface of the pipe receiving portion 17 is positioned above the center of the main pipe 1. However, when the main pipe 1 is buried in a shallow position in the ground, the branch pipe 2 may approach the main pipe 1 from a substantially lateral direction outside the attachment range. In such a case, the above-mentioned branch pipe 2 is usually connected to the pipe receiving portion 17 via an elbow or the like, so that the construction work becomes complicated. It is not impossible to form the opening portion 4 so as to open laterally away from the attachment range, but the main pipe 1 is embedded in the ground and is difficult to move. Therefore, the formation of the opening portion 4 is extremely difficult, and the possibility of flow obstruction and backflow as described above becomes extremely high.
In the pipe joint 10 of the present embodiment, the opening direction of the opening portion 4 formed in the main pipe 1 is upward or diagonally upward by bending the pipe receiving portion 17 with respect to the neck portion 16 as described above. Since the pipe receiving portion 17 is in the horizontal direction, the branch pipe 2 approaching from the horizontal direction or obliquely upward can be suitably connected, and the main pipe 1 embedded in the shallow position can be connected. Even for work, workability can be improved. Further, the attachment position of the pipe joint 10 to the main pipe 1 can be changed so that the pipe receiving portion 17 is oriented according to the position of the branch pipe 2, and the degree of freedom of piping is increased. Can do. Further, in the pipe joint 10, an angle display part 20 indicating the attachment angle of the pipe receiving part 17 with respect to the main pipe 1 is provided on the side surface of the saddle part 11 to further improve workability.

The pipe joint 10 is formed using a synthetic resin such as polyvinyl chloride, polyethylene, or polypropylene as a material. Further, the saddle portion 11 and the pipe connecting portion 12 may be molded integrally using an existing molding method such as an injection molding method, or the saddle portion 11 and the pipe connecting portion 12 may be separately formed. You may shape | mold and join.
The pipe joint 10 is fixed to the main pipe 1 by using a wire such as a metal wire, a clamp, or a band, or by using the wire and an adhesive in combination. In the pipe joint 10, a recess 21 extends on the outer peripheral surface of the saddle portion 11 so as to extend along the circumferential direction of the main pipe, and is opened to the outside at an end portion that reaches the peripheral edge of the saddle portion 11. As is provided. A wire used for fixing the pipe joint 10 to the main pipe 1 is wound around the concave strip 21, and the end of the concave strip 21 is opened to the outside. The wire rod can be wound without a gap without lifting from the outer peripheral surface of the saddle portion 11, and the crimping between the peripheral edge of the opening 14 of the saddle portion 11 and the peripheral edge of the opening portion 4 of the main pipe 1 is strong. Therefore, the fixation can be stabilized.
Further, it is desirable that the concave strip 21 is disposed at a position closest to the neck portion 16 of the pipe connecting portion 12, and the concave strip 21 is disposed at a position closest to the neck portion 16 so that the pipe connecting portion 12 It becomes possible to fix the neck more stably and firmly.
In addition to the recess 21, there are a plurality of recesses on the outer surface of the saddle portion 11. The recess 21 is opened to the outside at the end that reaches the periphery of the saddle portion 11. In addition, since it can be easily and quickly distinguished from other concave stripes, there is also an advantage that a work builder can easily grasp a suitable winding position of the wire.

The opening 14 of the pipe joint 10 and the opening 4 of the main pipe 1 will be described.
As shown in FIG. 5 (a), the opening 14 of the pipe joint 10 has a peripheral shape in which a pair of circles C ₁ and C ₂ having the same diameter are connected to the center O ₁ and O ₂ of the main pipe. there is a predetermined distance separated the after with said axis AX _M and a pair of tangent TL 1 extending parallel _becomes tied in TL ₂ ends semicircular oblong track shape along the the axis AX _M.
The short width d ₁ of the opening 14 is set to be shorter than the inner diameter φ _{M of the} main pipe 1, and a relationship of d ₁ <φ _M is established.
Longitudinal width d ₂ of the opening 14 is set to be longer width dimension than the inner diameter phi _S of the branch pipe 2, a relationship of d _2> phi _S.
The shorter width _{d 1} is the equal to the diameter of the circle _C 1, _{C 2,} if the distance between the center _O 1, _{O 2} of the pair of circle _C 1, _{C 2} is L, the longitudinal width d ₂ is d ₂ = d ₁ + L.
The opening area of the opening 14 is preferably set equal to or larger than the opening area of the branch pipe 2 from the viewpoint of ensuring a smooth water flow. When the opening area of the opening 14 is smaller than the opening area of the branch pipe 2, the amount of water flowing out from the opening 14 of the pipe joint 10 is smaller than the amount of water flowing in from the branch pipe 2. There is a risk of backflow.

As shown in FIG. 5 (b), the opening portion 4 of the main pipe 1 is inserted into the annular projecting portion 15 surrounding the opening portion 14. It is said that. In addition, the center of a pair of circles that bear both ends of the track shape in the opening portion 4 and the opening portion 14 is substantially the same position.
The short width d ₃ of the opening 4 is substantially equal to the width of the short width d ₁ of the opening 14 plus the thickness T of the annular protrusion 15, and d ₃ ≈d ₁ + (2 × T ).
Longitudinal width _{d 4} of the opening portion 4 is approximately equal to the width length plus the thickness T of the annular projection 15 in the longitudinal width _{d 2} of the opening 14, _{d 4} ≒ _d 2 + a (2 × T) It becomes a relationship. Further, the longitudinal width d ₄ has a relationship of d ₄ = d ₃ + L with the short width d ₃ and the above-described center distance L.

The center-to-center distance L is set to n times the rib interval P of the main pipe 1 (n is a positive integer not including 0), and has a relationship of L = P × n.
In the pipe joint 10, as described above, when the saddle portion 11 is placed on the outer peripheral surface of the main pipe 1, the annular rib 3 is accommodated in the rib groove 13. That is, the rib groove 13 and the annular rib 3 are in a corresponding positional relationship.
If any _one of the centers O ₁ and O ₂ of the pair of circles C ₁ and C ₂ is arranged at the center between the rib grooves 13, the center-to-center distance L is n times the rib interval P. Therefore, the other is also disposed between the rib grooves 13, that is, the centers O ₁ and O _{2 of the} pair of circles C ₁ and C ₂ are the annular ribs of the main pipe 1. They are respectively arranged in the center between the three.
Accordingly, the longitudinal width d ₂ of the opening 14, when a state of carrying the saddle portion 11 on the outer peripheral surface of the main pipe 1 while accommodating the annular rib 3 to the rib groove 13, the track The centers O ₁ and O ₂ of the pair of circles C ₁ and C ₂ bearing both ends of the shape are set so as to be positioned approximately at the center between the annular ribs 3 of the main pipe 1.

The center distance L, compared shorter width _{d 3} of the opening portion _4, it is preferable to set to be larger than _{d 3/2 ((d 3} /2) <L). If L is d _3/2 or less, when forming the opening portion 4 by using a hole saw, as described later, since one of the central of the pair of circular ends up located in the other circle, the hole saw The tip cannot be fixed, making the constriction hole difficult.
The center distance L is preferably set to be equal to d ₃ or smaller than d ₃ with respect to the short width d ₃ of the opening 4 (L ≦ d ₃ ). L is greater than d _3, when forming the opening portion 4 by using a hole saw, as described later, too far it is between a pair of circular holes formed by the hole saw, the work to ablate between the Circular Holes Becomes complicated.
Shorter width _{d 3} of the opening portion 4, from the viewpoint of ensuring smooth water flow to the inside diameter phi _M of the main pipe 1, can be set to 0.5φ _{M <d 3} <0.78φ _M Desirably, it is more desirable to set 0.65φ _M <d ₃ <0.78φ _M. If d ₃ is less than 0.5Fai _M, easily stagnate water flow from the tube joint 10 to the main pipe 1, when _{d 3} is more than 0.78Fai _M, possibly the strength of the main pipe is lowered is there.
And since _{d 3} is _{≒ d 1 + (2 × T} ), since it is _{d 1 <d 3,} the Tantehaba _{d 1} is the distance L between centers and _{(d 1/2) <L} <d 1 relationship filled, the inner diameter of the serial mains 1 phi _M and satisfy a relation of - - ((2 × T) 0.78φ M) (0.5φ M (2 × T)) <d 1 <.

In the pipe joint 10, the saddle portion 11 is provided with indicating means for indicating the positions of the centers O ₁ and O ₂ of the pair of circles C ₁ and C ₂ that bear both ends of the track shape in the opening 14. It has been. As shown in FIGS. 1 to 4, the indicating means includes a recess 22 formed in a pair of notches on each long side edge of the saddle portion 11, and a recess 22 formed in a notch on each short side edge. , A total of six recesses 22. These recesses 22 are provided at positions corresponding to the centers O ₁ and O ₂ .

The neck portion will be described.
In the pipe connecting portion 12 of the pipe joint 10, as described above, the inner peripheral shape of the opening 14 is a track shape, whereas the inner peripheral shape of the tube receiving portion 17 is a perfect circle. Therefore, in order to connect the inner peripheral surface of the opening 14 and the inner peripheral surface of the tube receiving portion 17, the inner peripheral surface of the neck portion 16 has a shape corresponding to each. That is, the neck 16 has an inner peripheral edge shape that gradually decreases in the longitudinal width from the saddle portion 11 side toward the tube receiving portion 17 side (see FIG. 1), and gradually has a short width. (See FIG. 6). Further, as shown in FIG. 7, on the inner peripheral surface of the neck portion 16, there is no obstacle such as reverse gradient that disturbs the water flow from the branch pipe 2 to the main pipe 1, and a smooth water flow is ensured. Yes.
In the neck portion 16, in the vicinity of the end portion on the saddle portion 11 side, the longitudinal width of the inner peripheral edge is further reduced over a predetermined range as compared with other portions, thereby reducing the diameter of the width shorter than the longitudinal width of the opening portion 14. A portion 23 is provided. In the range where the reduced diameter portion 23 is provided, the neck portion 16 has a smaller outer peripheral longitudinal width. When the saddle portion 11 is viewed in plan, the neck 16 has a longitudinal end on the outer peripheral edge and the opening. The longitudinal end of the inner edge of the portion 14 is substantially the same position. And as a result of providing this reduced diameter part 23 and making the longitudinal width of the outer periphery of the said neck part 16 small, it becomes possible to arrange | position the said concave strip 21 in the nearest position of the said neck part 16. FIG.
That is, the pipe joint 10 is fixed to the main pipe 1 by winding a wire such as a number wire around the concave strips 21 located on both sides of the neck portion 16 as described above. It is desirable that the pipe connection portion 12 is disposed at a position closest to the neck portion 16. In other words, it is desirable that the fixing portion such as the concave strip 21 for winding the wire is determined as close to the neck of the neck portion 16 as possible. This is because if one fixing location is farther from the neck than the other fixing location, the crimping between the peripheral edge of the opening 14 of the saddle portion 11 and the peripheral edge of the opening portion 4 of the main pipe 1 becomes weak. Therefore, there is a possibility that the neck 16 may not be stably fixed to the main pipe 1. In addition, there is a possibility that a problem of so-called “single float” may occur, in which the balance of force cannot be balanced between these fixed portions, and the saddle portion 11 is lifted with respect to the main pipe 1 at the one fixed portion. It is.
The pipe joint 10 corresponding to the main pipe 1 having the annular rib 3 is provided with the rib groove 13 on the inner surface of the saddle portion 11 so as to accommodate the annular rib 3. The outer surface of the portion 11 generally has an uneven portion corresponding to the rib groove 13, and the wire is usually wound around the recessed portion of the uneven portion. In the pipe joint 10 according to the present embodiment, the longitudinal end of the inner edge of the opening 14 is located at substantially the same position as the recess 21 of the recess by setting the dimensions described above. Accordingly, the reduced diameter portion 23 is provided, and the position of the longitudinal end on the outer peripheral edge of the neck portion 16 is substantially matched with the position of the longitudinal end on the inner edge of the opening portion 14, so that the neck portion 16 is positioned at the closest position of the recess 21. The neck is arranged.
When it is assumed that the reduced diameter portion 23 is not provided, the outer peripheral edge of the neck portion 16 is positioned outside the inner edge of the opening portion 14 by the thickness of the peripheral wall of the neck portion 16, so that the wire rod As a concave portion around which the wire is wound, it is necessary to select a portion outside the groove 21, and as a result, it is separated from the neck portion of the neck portion 16.
In addition, if the opening area of the flow path of the reduced diameter portion 23 is smaller than the opening area of the flow path of the tube receiving portion 17, the flow-down performance is deteriorated, and in some cases, there is a possibility that backflow occurs. The predetermined range in which the reduced diameter portion 23 is provided is the thickness of the saddle portion 11, specifically, the thickness of the saddle portion 11 in the vicinity of the end portion of the neck portion 16 from the tip edge (lower end edge) of the annular projecting portion 15. It is desirable that

The attachment of the pipe joint 10 to the main pipe 1 will be described.
When the pipe joint 10 is attached to the main pipe 1, as shown in FIG. 8, first, the pipe joint 10 is temporarily placed at a desired position on the main pipe 1, and the main pipe is based on the recess 22. The marking M is applied on the outer peripheral surface of 1.
Next, the pipe joint 10 is removed from the main pipe 1 and, as shown in FIG. 9, the markings M are applied to a line A ₁ parallel to the axis of the main pipe 1 and a line A ₂ orthogonal to the axis. And marking centers O ₁ and O ₂ are applied to the intersections of the line A ₁ and the line A ₂ . At this time, the marking centers O ₁ and O ₂ are always located between the annular ribs 3.
Subsequently, the tip of the hole saw is aligned with the marking centers O ₁ and O ₂ , and a pair of circular holes C ₁ and C ₂ are drilled in the peripheral wall of the main pipe 1 as shown in FIG.
Then, the space between the pair of circular holes C ₁ and C ₂ is cut along a pair of tangent lines TL ₁ and TL ₂ extending in parallel with the axis of the main tube 1, and as shown in FIG. An opening portion 4 is formed in the peripheral wall.
Then, the saddle portion 11 is placed on the outer peripheral surface of the main pipe 1 so that the concave portion 22 is aligned with the marking M, and the annular projecting portion 15 is inserted into the opening portion 4. The pipe joint 10 is fixed to the main pipe 1 by winding the pipe joint 10 so as to be accommodated in 21 and binding the pipe joint 10 to the main pipe 1 with the wire rod.

The present invention is not limited to the above embodiment, and may be modified as follows.
For example, the tube receiving portion may be a free receiving port, a flexible receiving port, an adhesive receiving port, or the like, or may be an insertion port. Moreover, the material to be used is not limited to a synthetic resin, and a metal, ceramics, or the like may be used.

  According to the pipe joint of the present invention, it is possible to simplify the work when a main pipe with an annular rib is an attachment target, and thus there is industrial applicability.

DESCRIPTION OF SYMBOLS 1 Main pipe 2 Branch pipe 3 Annular rib 4 Open part 10 Pipe joint 11 Saddle part 12 Pipe connection part 13 Rib groove 14 Opening part 16 Neck part 17 Pipe receiving part 20 Angle display part 21 Concave 22 Concave part 23 Discontinuous part

Claims (6)

A pipe joint used when connecting a branch pipe having a diameter equal to or larger than the main pipe to a main pipe having a large number of annular ribs arranged in parallel on the outer peripheral surface,
A saddle portion is provided on the outer peripheral surface of the main pipe, and the saddle portion is provided with a plurality of rib grooves in which the annular ribs are accommodated, and an opening, and the periphery of the opening It has a configuration in which a pipe connection part for connecting the branch pipes is extended from
The peripheral shape of the opening is formed by connecting a pair of circles having the same diameter with a pair of tangents extending in parallel to the axis after being separated from each other by a predetermined distance along the axis of the main pipe. It is a semicircular oval track at both ends,
The opening is
The short width is set so that the width is shorter than the inner diameter of the main pipe,
The center of the pair of circles bearing the both ends of the track shape in a state where the saddle portion is placed on the outer peripheral surface of the main pipe while accommodating the annular rib in the rib groove, respectively, The longitudinal width is set so as to be approximately at the center between and the width is longer than the inner diameter of the branch pipe,
The pipe connecting portion includes a neck portion having a cylindrical shape corresponding to the shape of the opening portion, and a pipe receiving portion having a true cylindrical shape corresponding to the shape of the branch pipe. Pipe fittings. The neck portion is provided with a reduced diameter portion in the vicinity of the end on the saddle portion side so that the longitudinal width of the inner peripheral edge is shorter than the longitudinal width of the opening. The pipe joint described in 1. The pipe joint according to claim 1 or 2, wherein the saddle portion is provided with indicating means for indicating a position of each center of the pair of circles that bear both ends of the track shape. On the outer peripheral surface of the saddle portion, a recess is provided so as to extend along the circumferential direction of the main pipe and to be opened outward at an end portion reaching the periphery of the saddle portion.
The pipe joint according to any one of claims 1 to 3, wherein a wire used for fixing to the main pipe is wound around the concave strip. The pipe joint according to claim 4, wherein the concave line is disposed at a position closest to the neck part of the pipe connection part. The pipe joint according to any one of claims 1 to 5, wherein the pipe receiving part is bent with respect to the neck so that the axes intersect and extend.

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