JP7065669B2 - Branch fitting - Google Patents

Description

The present invention relates to a branch joint.

Conventionally, the branch joint described in Patent Document 1 below is known. The branch joint connects the main pipe of the cable protection pipe and the branch pipe. The branch joint has a saddle part attached to the outer surface of the main pipe and a branch pipe part having a branch angle that protrudes from the outer surface of the saddle part and has an acute angle with respect to the pipe axis of the main pipe with the saddle part attached to the main pipe. And have.

Japanese Unexamined Patent Publication No. 2014-14296

However, the conventional branch joint has a problem that the branch joint tends to rattle with respect to the main pipe before the saddle portion is fixed to the outer surface of the main pipe.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to firmly fix a branch joint to a main pipe.

In order to solve the above problems, the present invention proposes the following means.
One aspect of the branch joint according to the present invention is a branch joint that connects the main pipe of the cable protection pipe and the branch pipe, and has a saddle portion attached to the outer surface of the main pipe and a protrusion from the outer surface of the saddle portion. An opening formed in a connecting portion between a branch pipe portion having a branch angle that is a sharp angle with respect to the pipe axis of the main pipe and the branch pipe portion in the saddle portion with the saddle portion attached to the main pipe. It is provided with an annular protrusion protruding from the inner surface of the saddle portion so as to be along the peripheral edge of the pipe, and is located on the first side of the annular protrusion, which is the side on which the branch pipe portion protrudes along the pipe axis direction. The outer peripheral surface of the first portion is inclined at an angle larger than the branch angle of the branch pipe portion, or extends perpendicular to the inner surface of the saddle portion.
One aspect of the branch joint according to the present invention is a branch joint that connects the main pipe of the cable protection pipe and the branch pipe, and has a saddle portion that has an arc shape and is attached to the outer surface of the main pipe, and the saddle portion. Along the peripheral edge of the opening formed in the connecting portion between the branch pipe portion protruding from the outer surface and having a branch angle sharp with respect to the pipe axis passing through the center of curvature of the saddle portion and the branch pipe portion in the saddle portion. The first portion of the annular protrusion, which is provided with an annular protrusion protruding from the inner surface of the saddle portion, is located on the first side of the annular protrusion, which is the side on which the branch pipe portion protrudes along the pipe axis direction. The outer peripheral surface is inclined at an angle larger than the branch angle of the branch pipe portion, or extends perpendicular to the inner surface of the saddle portion.

The outer peripheral surface of the first portion of the annular projection is inclined at an angle larger than the branch angle or extends perpendicular to the inner surface of the saddle portion. Therefore, for example, the first portion can be firmly locked to the peripheral edge of the branch hole formed in the main pipe as compared with the case where the outer peripheral surface of the first portion is inclined at an angle smaller than the branch angle. can. As a result, the branch joint can be firmly fixed to the main pipe.

The first portion may be formed in an arc shape that is convex toward the first side when the inner surface of the saddle portion is viewed in a plan view.

The first portion is formed in an arc shape that is convex toward the first side when the inner surface of the saddle portion is viewed in a plan view. Therefore, the first portion can be secured long along the peripheral edge of the opening. As a result, the above-mentioned effect of being able to firmly lock the first portion to the main can be exerted over a wide range.

A parting line may be formed on the inner surface of the saddle portion.

A parting line is formed on the inner surface of the saddle portion. That is, when molding the branch joint, the mold located on the inner surface side of the saddle portion can be divided into a plurality of molds to form the branch joint. As a result, like this branch joint, the outer peripheral surface of the first portion is inclined at an angle larger than the branch angle of the branch pipe portion, or extends perpendicularly to the inner surface of the saddle portion. However, it can be easily and accurately formed.

The parting line may be formed in a region of the inner surface of the saddle portion where the annular protrusion is located along the pipe axis direction.

When the parting line is formed, the inner surface of the saddle portion rises by the parting line. Therefore, if the saddle portion is simply attached to the main pipe with the parting line formed on the inner surface, rattling may occur due to the parting line.
By the way, when branching the main pipe using a branch joint, the main pipe is perforated to form a branch hole. Of the main pipe, the perforated region in which the branch hole is formed along the pipe axis direction tends to be reduced in diameter due to the residual stress of the main pipe.
Therefore, in this branch joint, the parting line is formed in the inner surface of the saddle portion in the region where the annular protrusion is located along the pipe axis direction. Therefore, by fitting the annular protrusion into the branch hole, the parting line can be arranged in the drilling region of the main pipe whose diameter is reduced due to the influence of the drilling. As a result, the influence of rattling that may occur due to the formation of the parting line can be suppressed.

According to the present invention, the branch joint can be firmly fixed to the main pipe.

It is a side view which shows the state which the branch joint which concerns on one Embodiment of this invention is attached to a main pipe. It is a vertical sectional view of the branch joint and the main which is shown in FIG. It is an enlarged view of the X part shown in FIG. It is a vertical sectional view of the branch joint shown in FIG. FIG. 3 is a plan view of the branch joint shown in FIG. 4 as viewed from the inner surface side. It is a top view which looked at the branch joint which concerns on the modification of this invention from the inner surface side.

Hereinafter, a branch joint according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
As shown in FIGS. 1 and 2, the branch joint 10 is used to connect the branch pipe 14 to the main pipe 12 of the cable protection pipe. The cable protection pipe is a pipe for protecting the cable by accommodating a cable (not shown) such as a communication line or a power line buried in the ground inside. The cable protection pipe includes a main pipe 12, a branch pipe 14, and a branch joint 10 connecting them. The main 12 is buried in the ground along a road, for example. The branch pipe 14 branches from the main pipe 12, for example, and extends into the building. The main pipe 12 and the branch pipe 14 are formed of a synthetic resin such as a hard vinyl chloride resin.

The branch joint 10 includes a saddle portion 20 that is closely attached to the outer surface of the main pipe 12, and a branch pipe portion 22 that projects at an acute angle from the outer surface of the saddle portion 20. The branch joint 10 is formed of, for example, a synthetic resin such as a rigid vinyl chloride resin.
The saddle portion 20 is formed in a semi-cylindrical shape (arc shape) having an inner surface having substantially the same shape as the outer surface of the main pipe 12. The center of curvature of the arc formed by the saddle portion 20 is located on the pipe axis O of the main pipe 12. The length of the saddle portion 20 in the tube axis O direction is, for example, 500 mm.

The branch pipe portion 22 is formed in a straight tubular shape, and with the saddle portion 20 (branch joint 10) attached to the main pipe 12, the pipe shaft O of the main pipe 12 (the pipe shaft O passing through the center of curvature of the saddle portion 20). It extends sharply with respect to. The branch angle (cable take-out angle) of the branch pipe portion 22 with respect to the main pipe 12 is set to an angle at which the cable can be smoothly pulled in, and is set to, for example, 25 to 50 ° (45 ° in the present embodiment).
In the following, the side on which the branch pipe portion 22 protrudes along the pipe axis O direction (the left side of the paper surface in FIGS. 1 and 2) is referred to as the first side S1, and the opposite side is referred to as the second side S2.

An opening 24 is formed in the connecting portion of the saddle portion 20 with the branch pipe portion 22. The opening 24 communicates with the inside of the branch pipe portion 22, and the peripheral edge of the opening 24 is smoothly connected to the inner surface of the branch pipe portion 22. As shown in FIG. 5, the opening 24 is formed in a substantially elliptical shape (oblong hole shape) extending in the tube axis O direction in a plan view of the saddle portion 20 when viewed from the inner surface.

On the inner surface of the saddle portion 20, an annular protrusion 26 formed in an annular shape along the peripheral edge of the opening 24 and extending over the entire circumference of the opening 24 is formed. The annular protrusion 26 is formed in a substantially elliptical shape (oval hole shape) long in the tube axis O direction in the plan view. The annular projection 26 includes a first portion 31 located on the first side S1, a second portion 32 located on the second side S2, and a third portion 33 connecting the first portion 31 and the second portion 32. It is equipped with.

The first portion 31 is formed in an arc shape (curve shape) that is convex toward the first side S1 in the plan view. Of the first portion 31, a groove 34 extending in the direction of the tube axis O is formed in the central portion (the central portion of the arc shape) in the direction orthogonal to the tube axis O in the plan view (hereinafter referred to as the orthogonal direction D). Has been done. The groove portion 34 divides the first portion 31 into a pair in the orthogonal direction D. The groove portion 34 does not have to be provided, and in that case, the first portion 31 is formed in a continuous arc shape.

The second portion 32 is formed in an arc shape (curve shape) that is convex toward the second side S2 in the plan view. The wall thickness (distance between the inner peripheral surface and the outer peripheral surface) in the second portion 32 is smaller than the wall thickness in the first portion 31.
The third portion 33 is arranged in pairs at intervals in the orthogonal direction D. The third portion 33 extends linearly in the direction of the pipe axis O, and connects the peripheral edges of the first portion 31 and the second portion 32 to each other.

As shown in FIGS. 2 and 3, the annular projection 26 is fitted in the branch hole 18 formed in the main pipe 12. The branch hole 18 is formed to be slightly larger than the annular projection 26 in the plan view, and the annular projection 26 is locked to the peripheral edge of the branch hole 18.
The protruding height of the annular protrusion 26 is set to be substantially the same as the wall thickness of the main pipe 12 or slightly larger than the wall thickness of the main pipe 12 (for example, about 1 mm). The protrusion height of the annular protrusion 26 is set so as to be approximately the same height as the inner surface of the main pipe 12 or slightly protrude from the inner surface of the main pipe 12 with the saddle portion 20 attached to the main pipe 12. Will be done.

As shown in FIG. 3, the outer peripheral surface 31a of the first portion 31 extends perpendicular to the inner surface of the saddle portion 20. In the present embodiment, in the vertical cross-sectional view including the central axis of the pipe axis O and the branch pipe portion 22, the outer peripheral surface 31a extends perpendicularly to the inner surface of the saddle portion 20 via the first fillet 31b. .. In the vertical cross-sectional view, the first fillet 31b is formed in a concave curved shape that is concave toward the second side S2.

In the vertical cross-sectional view, the outer peripheral surface 31a of the first portion 31 may be inclined at an angle larger than the branch angle of the branch pipe portion 22. The fact that the outer peripheral surface 31a is inclined at an angle larger than the branch angle means that the outer peripheral surface 31a is located on the second side S2 of the saddle portion 20 with respect to the inner surface of the saddle portion 20 in the vertical cross-sectional view. And it means that it is tilted at an angle larger than the branch angle. In other words, the inclination angle formed by the outer peripheral surface 31a in the vertical cross-sectional view is larger than the branch angle and less than 90 °.

In the vertical cross-sectional view, the outer peripheral surface 31a of the first portion 31 is connected to the protruding end surface 31c of the first portion 31 (the surface facing the protruding direction in the annular projection 26) via the second fillet 31d. In the vertical cross-sectional view, the protruding end surface 31c extends along the pipe axis O direction. In the vertical cross-sectional view, the second fillet 31d is formed in a convex curve shape that is convex toward the first side S1.

As shown in FIGS. 4 and 5, a parting line 35 is formed on the inner surface of the saddle portion 20. The parting line 35 is formed on the inner surface of the saddle portion 20 in a region (projection region R1) where the annular projection 26 is located along the pipe axis O direction. As shown in FIG. 5, the parting line 35 crosses the boundary between the first portion 31 and the third portion 33 of the annular projection 26 in the orthogonal direction D in a plan view of the saddle portion 20 from the inner surface. It is formed.

When attaching such a branch joint 10 to the main pipe 12, after forming a branch hole 18 in the main pipe 12, an annular protrusion 26 is fitted in the branch hole 18, and the outer surface of the main pipe 12 and the saddle portion 20 are fitted. Adhesively join with the inner surface of the. In the main pipe 12, the region where the branch hole 18 is formed along the pipe axis O direction (perforation region R0) is reduced in diameter due to the residual stress during extrusion molding, and is compared with the portion where the branch hole 18 is not formed. And the outer diameter becomes smaller. Therefore, in the drilling region R0, a gap (float) is likely to occur between the outer surface of the main pipe 12 and the inner surface of the saddle portion 20, but since the parting line 35 is arranged at this position, the gap is formed in the party. The protrusion of the parting line 35 can offset a certain amount or completely.

The method for manufacturing such a branch joint 10 is not particularly limited, but injection molding or the like can be used. When injection molding is used, for example, different molds can be used on the inner surface side and the outer surface side of the saddle portion 20. In this case, the mold on the inner surface side of the saddle portion 20 has a parting line on the first mold located on the first side S1 and the second mold located on the second side S2 along the pipe axis O direction. It can be divided based on the position of 35. At this time, for example, the first type and the second type are separated from the inner surface of the saddle portion 20 vertically while the second type is separated from the inner surface of the saddle portion 20 with a branch angle. The mold release direction can be changed. As a result, in the present embodiment, the outer peripheral surface 31a of the first portion 31 is inclined at an angle larger than the branch angle of the branch pipe portion 22 or extends perpendicularly to the inner surface of the saddle portion 20. Even the branch joint 10 can be formed with high accuracy.

As described above, according to the branch joint 10 according to the present embodiment, the outer peripheral surface 31a of the first portion 31 of the annular projection 26 is inclined at an angle larger than the branch angle, or the inner surface of the saddle portion 20 is formed. It extends perpendicular to. Therefore, for example, the first portion 31 can be firmly locked to the peripheral edge of the branch hole 18 as compared with the case where the outer peripheral surface 31a of the first portion 31 is inclined at an angle smaller than the branch angle. As a result, the branch joint 10 can be firmly fixed to the main pipe 12.

The first portion 31 is formed in an arc shape that is convex toward the first side S1 when the inner surface of the saddle portion 20 is viewed in a plan view. Therefore, the first portion 31 can be secured long along the peripheral edge of the opening 24. As a result, the above-mentioned effect of being able to firmly lock the first portion 31 to the main pipe 12 can be exerted over a wide range.

A parting line 35 is formed on the inner surface of the saddle portion 20. That is, when molding the branch joint 10, the mold located on the inner surface side of the saddle portion 20 can be divided into a plurality of molds to form the branch joint 10. As a result, like the branch joint 10, the outer peripheral surface 31a of the first portion 31 may be inclined at an angle larger than the branch angle of the branch pipe portion 22, or may extend perpendicular to the inner surface of the saddle portion 20. Even if it is done, it can be easily and accurately formed.

When the parting line 35 is formed, the inner surface of the saddle portion 20 is raised by the parting line 35. Therefore, if the saddle portion 20 is simply attached to the main pipe 12 with the parting line 35 formed on the inner surface, rattling may occur due to the parting line 35.
By the way, when the main pipe 12 is branched by using the branch joint 10, the main pipe 12 is perforated to form a branch hole 18. The perforated region R0 of the main pipe 12 is likely to be reduced in diameter due to the residual stress of the main pipe 12.
Therefore, in this branch joint 10, the parting line 35 is formed in the protrusion region R1 of the saddle portion 20. Therefore, by fitting the annular projection 26 into the branch hole 18, the parting line 35 can be arranged in the perforation region R0 of the main pipe 12, which is reduced in diameter due to the influence of the perforation. As a result, the influence of rattling that may occur due to the formation of the parting line 35 can be suppressed.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The parting line 35 is not limited to the embodiment shown in the above embodiment.
For example, the parting line 35 may have a form such as the branch joint 10A according to the modification shown in FIG. In this branch joint 10A, the parting line 35 is linear from the connecting portion (the end of the first side S1 in the third portion 33) with the first portion 31 in the third portion 33 toward the first side S1. It extends and is formed up to the end of the saddle portion 20. The parting lines 35 are arranged in pairs at intervals in the orthogonal direction D. The parting line 35 extends in parallel with the pipe axis O (the axis of the saddle portion 20, the axis of the main 12).
Further, for example, the parting line 35 may be omitted.
The first portion 31 may not be formed in an arc shape in the plan view.

In addition, it is possible to appropriately replace the components in the embodiment with well-known components without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

10, 10A Branch joint 12 Main pipe 14 Branch pipe 20 Saddle part 22 Branch pipe part 24 Opening 26 Circular protrusion 31 First part 31a Outer peripheral surface 35 Parting line D Orthogonal direction O Pipe axis R1 Region S1 First side

Claims (3)

A branch joint that connects the main pipe of the cable protection pipe and the branch pipe.
The saddle part attached to the outer surface of the main pipe and
A branch pipe portion that protrudes from the outer surface of the saddle portion and has a branch angle that makes an acute angle with respect to the pipe axis of the main pipe in a state where the saddle portion is attached to the main pipe.
The saddle portion is provided with an annular protrusion protruding from the inner surface of the saddle portion so as to be along the peripheral edge of the opening formed in the connecting portion with the branch pipe portion in the saddle portion.
The outer peripheral surface of the first portion of the annular protrusion located on the first side, which is the side on which the branch pipe portion protrudes along the pipe axis direction, is inclined at an angle larger than the branch angle of the branch pipe portion. Or extends perpendicular to the inner surface of the saddle .
A branch joint in which a parting line is formed in a region of the inner surface of the saddle portion where the annular protrusion is located along the pipe axis direction . A branch joint that connects the main pipe of the cable protection pipe and the branch pipe.
The saddle part that forms an arc and is attached to the outer surface of the main pipe,
A branch pipe portion having a branch angle that protrudes from the outer surface of the saddle portion and has an acute angle with respect to the pipe axis passing through the center of curvature of the saddle portion.
The saddle portion is provided with an annular protrusion protruding from the inner surface of the saddle portion so as to be along the peripheral edge of the opening formed in the connecting portion with the branch pipe portion in the saddle portion.
The outer peripheral surface of the first portion of the annular protrusion located on the first side, which is the side on which the branch pipe portion protrudes along the pipe axis direction, is inclined at an angle larger than the branch angle of the branch pipe portion. Or extends perpendicular to the inner surface of the saddle .
A branch joint in which a parting line is formed in a region of the inner surface of the saddle portion where the annular protrusion is located along the pipe axis direction . The branch joint according to claim 1 or 2, wherein the first portion is formed in an arc shape that is convex toward the first side when the inner surface of the saddle portion is viewed in a plan view.

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