JP2001187991A - Tube fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a branch pipe having a diameter equal to or larger than that of a main pipe while ensuring the strength of the main pipe and the smooth water flow from the branch pipe to the main pipe. SOLUTION: This tube fitting 1 for connecting the branch pipe 14 having a diameter equal to or larger than that of the main pipe 13 to the main pipe 13 is formed of a saddle part 2 and a pipe connection part protruded from the saddle part 2, the pipe connection part 3 having a root end lateral width d2 smaller than the diameter d1 of the main pipe 13 and a longitudinal width smaller than the diameter d3 of the branch pipe 14. When an opening part is provided on the branch pipe connection part of the main pipe 13 to mount the tube fitting 1, the central angle to the pipe circumference of the main pipe 13 is larger than 180 deg. even in the position of the opening part since the root end lateral width d2 of the pipe connection part d2 is smaller than the diameter d1 of the main pipe 13. Therefore, the strength of the main pipe is ensured by the rib effect of the pipe top. Further, since the root end longitudinal width of the tube fitting 1 is larger than the diameter d3 of the branch pipe 14, the water flow is smoothly kept.

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 main pipe and a branch pipe in piping such as a sewer pipe.

[0002]

BACKGROUND OF THE INVENTION In order to ensure a smooth water flow in a sewer pipe, the flow rate of the branch pipe must be smaller than the flow rate of the main pipe. Therefore, the inner diameter of the branch pipe is usually set smaller than the inner diameter of the main pipe. However, in recent years, a small-diameter main pipe has often been used. On the other hand, since the inner diameter of the branch pipe is determined by the standard, the inner diameter of the branch pipe may be equal to or larger than the inner diameter of the main pipe.

[0003]

2. Description of the Related Art Conventionally, to connect a main pipe to a branch pipe, a saddle T-shaped pipe joint (61) comprising, for example, a pipe connecting portion (66) and a saddle portion (62) as a main pipe mounting portion as shown in FIG. Is provided. In order to connect the branch pipe to the main pipe by the saddle T-shaped pipe joint (61), a hole is made in a connecting portion of the main pipe, and the saddle T-shaped pipe joint is abutted and fixed to the main pipe, and then the branch pipe is connected to the pipe. This is done by inserting it into the end of the part.

[0004]

SUMMARY OF THE INVENTION Such a pipe joint (61)
Applies only when the diameter of the branch pipe (14) is smaller than the diameter of the main pipe (13), and when the diameter of the conventional branch pipe is equal to or larger than the diameter of the main pipe, No fittings were provided to connect the tubing to the mains.

[0005]

According to the present invention, a branch pipe (14) having a diameter equal to or larger than the diameter of the main pipe (13) is connected to the main pipe (13). A pipe joint (1) comprising a saddle part (2) and a pipe connection part (3) protruding from the saddle part (2), in a short side direction of a root end of the pipe connection part (3). width d ₂ is intended to provide a main tube small longitudinal width d ₄ is the branches tube than the diameter d ₁ of the (13) (14) diameter d ₃ pipe joint is set larger than (1) the is there. The pipe joint (1) preferably has a pipe port (8). Further, the pipe receiving portion
Axis AX ₁ of the (8) is intended to provide a pipe joint that is eccentric (1). In the pipe fitting (1,21), the pipe connection part (3,2
It is desirable apical lateral direction width d ₂ of 3) is 0.5d ₁ <d ₂ <0.78d ₁ with respect to the diameter d ₁ of the main pipe (13), also the tube connecting portion (3 , 23 root tips longitudinal width d ₄₎ of the 1.5d ₂ against the root end lateral direction width d ₂ of the tube connecting portion (3, 23)
It is desirable that <d ₄ ≦ 2d ₂ .

[0006]

An opening H is provided at the branch pipe connection point of the main pipe (13), and the pipe joint (1) of the present invention is attached thereto via the saddle part (2). Since tube apical lateral direction width d ₂ of the joint (1) is smaller than the diameter d ₁ of the main pipe (13), the central angle θ also for peritubular mains (13) in place of the opening H It is larger than 180 °, and the reduction in strength at the opening of the main pipe (13) is small due to the rib effect of the pipe top. The root tip longitudinal width d ₄ of the tube fitting (1) is water is greater than the diameter d ₃ of the branches pipe (14) is smoothly maintained.

Further, if the axis AX ₁ of the pipe receiving portion (8) is eccentric, it is possible to connect even if the axis of the main pipe (13) and the axis of the branch pipe (14) are not crossed but deviated. And the degree of freedom of connection increases.

In the pipe joint (1, 21), the pipe connection part (3, 2)
Apical lateral direction width d ₂ of 3) is smooth water flow ensured from 0.5d ₁ larger than the branch pipe relative to the diameter d ₁ of the main pipe (13) (14) to the main pipe (13) If it is smaller than 0.78 d _1, the strength of the main pipe opening can be reliably maintained. Further, the width d _{4 in the} longitudinal direction of the root end of the pipe connection portion (3, 23) is 1.5 d ₂ <d ₄ ≦ 2d _{2 with} respect to the width d _{2 in the} width direction of the root end of the pipe connection portion (3, 23). Is the main
The work of narrowing the hole (13) and the work of attaching the pipe joints (1, 21) to the main pipe (13) are facilitated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in FIGS. Main pipe joint shown in Fig. 1
(1) a saddle part (2) having an arcuate cross-section having a curvature adapted to the outer peripheral curved surface shape of the main pipe, and the saddle part
And a pipe connection (3) protruding from (2).

The root end of the pipe connection part (3) is connected to the saddle part (2).
To form a flange (7). The flange (7) prevents the main pipe (13) from being displaced from the pipe joint (1), and also secures the connection between the main pipe (13) and the pipe connection part (3) of the pipe joint (1). To prevent water leakage.

The pipe connection part (3) is formed with a pipe receiving part (8) having an enlarged diameter. The pipe receiving portion (8) is formed in a tapered shape with a diverging depth, and a branch pipe (8) connected to the pipe receiving portion (8) is provided on the inner peripheral surface at the inner end of the pipe receiving portion (8). 14) Locking step to receive
(9) is provided, and a rubber ring mounting groove (10) is formed at the tip of the pipe socket (8).

As shown in FIGS. 2 to 5, the pipe connecting portion (3) is enlarged in the longitudinal direction (axial direction of the main pipe) below the locking step (9), and is expanded in the lateral direction (main pipe pipe). a reduced diameter in the direction perpendicular to the axis) than the diameter d ₃ of the root tip lateral direction width d ₂ is the longitudinal width d ₄ smaller than the diameter d ₁ of the main pipe (13) the branches pipe (14) Be enlarged.

In the pipe joint (1), the shape of the opening (4) of the saddle part (2) is a semicircular length at both ends formed by connecting a pair of circles having the same diameter by a pair of right and left tangents parallel to the main pipe axis. is a hole shape OV, d ₂ relative to the root end lateral direction width d ₂ of the distance between the centers of the pair of the circle of the long circular OV is tube connecting portion (3)
Greater than / 2, 1.5d ₁ preferably is set smaller than d ₁ with respect to the main pipe diameter d _1. Further, the width d _{4 in the} root tip longitudinal direction is 1.5 d ₂ <d ₄ ≤ with respect to the width d _{2 in the} root tip short direction.
It is set to 2d _2. The cross-sectional area of the OV is set equal to or larger than the cross-sectional area of the branch pipe (14). This ensures a smooth flow of water from the branch pipe (14) to the main pipe (13).

A main pipe (13) and a branch pipe (14) are formed by the pipe joint (1).
To connect the mains according to the site conditions as shown in Fig. 6.
(13) The receiving position of the branch pipe (14) is determined on the upper side, and a hole having a semicircular long hole OV 'at both ends having a diameter larger by α than the saddle part (2) opening part (4) is formed. In order to form a hole having the shape of a semicircular slot OV 'at both ends, the circles C ₁ and C ₂ are usually bored with a forsaw and then a pair of right and left tangents connecting the circles C ₁ and C ₂ parallel to the main pipe axis are formed. This is performed by cutting along the gap and deleting the inter-hole portion D.

In this case, the distance c between the centers of the pair of circles C ₁ , C ₂ of the oval OV ′ is the width d _{2 in the} short side direction at the root end of the pipe connection part (3) and the diameter d _{1 of the} main pipe. For (d ₂ + α) /
2 <c <1.5 d ₁ , preferably (d ₂ + α) / 2 <c
<(D ₂ + α). With this setting, it is easy to make a hole in the main pipe (13). Circle C _1, C distance c is the circle C ₁ between the centers of _2, C ₂ of radius (d ₂ + α) / ₂ or less to become the center of the other circle C ₂ of one circle C _1, as shown in FIG. 7 The circle C _{2, which} is to be pierced later because it is located inside, cannot be fixed because the shaft of the forsaw cannot be fixed. Further, as shown in FIG. 8, when the distance c between the centers of the circles C ₁ and C ₂ becomes 1.5 d ₁ or more, the two holes are too far apart and the work of cutting the inter-hole portion D is troublesome.

The diameter d ₅ (d ₂ + α) of the circles C ₁ and C ₂ is 0.5 d ₁ + α <d ₅ <0.7 with respect to the diameter d ₁ of the main pipe.
8d ₁ + α, preferably 0.65 d ₁ + α <d ₅ <0.
It is set to 78d ₁ + α. When the diameter d _{5 of the} circles C ₁ and C ₂ is 0.78 d ₁ + α or more, the strength of the main pipe decreases, and the circles C ₁ and C ₂ decrease.
Branch pipe when the diameter d ₅ of the C ₂ is less than 0.5d ₁ + α (14)
The water flow from the pipe to the main pipe (13) is not smooth. Normal nominal diameter 1
When inserting a 00 pipe (outer diameter 114 mm, inner diameter 107 mm), using a forsaw with a nominal diameter of 100, the hole diameter becomes 11
7 to 120 mm, and also in this embodiment, α is 10 to 1
It is set to 3 mm.

As shown in FIG. 9, the flange (7) of the pipe joint (1) is inserted into the hole thus drilled, and the saddle (2) of the pipe joint (1) is connected to the main pipe (13). A) and fixed with clamps or bands. Alternatively, they may be bonded with an adhesive.

Next, the branch pipe (14) is inserted into the pipe socket (8). The pipe end of the inserted branch pipe (14) is received by the locking step (9). If the pipe receiving portion (8) is formed to have a tapered shape that expands in the depth direction, it is movable in the radial direction when an external force is applied to the branch pipe (14), so that the external force is absorbed to absorb the branch pipe (14) and the pipe. The damage of the receiving part (8) can be prevented. The rubber ring (12) is in the rubber ring mounting groove (10).
Is attached to fix the inserted branch pipe (14) and maintain the sealing property between the pipe receiving portion (8) and the branch pipe (14).

The pipe joint (1) of the present invention is made of, for example, a synthetic resin such as polyvinyl chloride, polyethylene, or polypropylene. The saddle part (2) and the pipe connection part (3) are formed by integrally molding the above plastic or the like. Alternatively, they may be separately molded and then bonded.

FIGS. 10 to 12 show another embodiment of the present invention. 10 and 11 in the pipe joint (21) of this embodiment.
Tubular socket portion as shown in (28) the tube connecting portion and the axial core AX ₁
(23) eccentrically to the axis AX ₂ from the lateral direction of the saddle portion of the pipe connection portion (23) of the (direction perpendicular to the axis of the main pipe) by l are expanded form. Axis (the tube socket portion of the branch pipe In this way (14) axis AX ₁ and the main pipe is the axis AX ₃ connections can pipe even if displaced without intersection of (13) (28) The degree of freedom increases.

Further, in the pipe joint (21) of this embodiment, the locking step (29A) in the eccentric direction becomes large and the locking step (29B) on the side opposite to the eccentric direction becomes small, so that the side opposite to the eccentric direction is formed. In the case where the branch pipe (14) is inserted, as shown in FIG.
The inner peripheral surface of (14) and the wall surface of the pipe connection part (23) are substantially straight, and no reverse gradient is caused by the locking step (29B). Therefore, even when the pipe connection part (23) is installed horizontally, the water flow is kept smooth and the pipe can be constructed even when the main pipe is buried shallowly.

The present invention is not limited to the above embodiment. If the width at the root end of the pipe connection is smaller than that of the main pipe and the length at the root end of the pipe connection is larger than the diameter of the branch pipe, the saddle will be used. The shape of the opening is not limited to a semicircular long hole at both ends, and may be, for example, an ellipse, an oval, or a rectangle. Also, the pipe connection may be bent or curved. Further, the pipe receiving portion may be a universal joint or an insertion portion. The material is not limited to plastic, but may be made of metal, ceramic, or the like.

The pipe joint of the present invention may be applied not only to the connection between a main pipe and a branch pipe, but also to a pipe-to-pipe connection portion such as installation of a check tube or connection of a drainage trough to a pipe.

[0024]

According to the pipe joint of the present invention, a branch pipe having a diameter equal to or larger than the diameter of the main pipe can secure the strength of the main pipe and prevent a smooth water flow from the branch pipe to the main pipe. Can be connected without a connection. Further, when the axis of the pipe receiving portion is eccentric, connection can be made even if the axis of the main pipe and the axis of the branch pipe are misaligned, and the degree of freedom of piping is increased. In addition, since there is no reverse slope due to the locking step, even when the main pipe is buried shallowly, piping can be carried out while keeping the water flow smooth.

[Brief description of the drawings]

 1 to 10 show one embodiment of the present invention.

FIG. 1 is a perspective view of a pipe joint.

FIG. 2 is a front sectional view of a pipe joint.

FIG. 3 is a side sectional view of a pipe joint.

FIG. 4 is a plan view of a pipe joint.

FIG. 5 is a rear view of a pipe joint.

FIG. 6 is a partial plan view illustrating the state of the main constriction hole.

FIG. 7 is a partial plan view illustrating the state of the main hole.

FIG. 8 is a partial plan view illustrating the state of the main hole.

FIG. 9 is a side sectional view of a branch pipe connection state. FIGS. 10 to 12 show another embodiment of the present invention.

FIG. 10 is a side sectional view of a pipe joint.

FIG. 11 is a plan view of a pipe joint.

FIG. 12 is a side sectional view of a branch pipe connection state.

FIG. 13 is a perspective view of a conventional pipe joint.

[Explanation of symbols]

3 pipe connection 8 pipe 1 pipe coupling 2 saddle mouth part 13 main 14 branch AX ₁ axial d _1, d ₃ diameter d ₂ short direction width d ₄ longitudinal width

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[Procedure amendment]

[Submission date] January 4, 2000 (200.1.4)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 6

FIG. 3

FIG. 4

FIG. 5

FIG. 7

FIG. 8

FIG. 9

FIG. 10

FIG. 11

FIG.

FIG. 13

Claims (5)

[Claims] 1. A pipe joint for connecting a branch pipe having a diameter equal to or larger than the diameter of the main pipe to the main pipe, comprising a saddle portion and a pipe connection portion protruding from the saddle portion. Become
A pipe joint characterized in that a width at a root end in a short direction is smaller than a diameter of the main pipe and a width in a longitudinal direction is larger than a diameter of the branch pipe. 2. The pipe joint according to claim 1, wherein a pipe receiving portion is formed in the pipe connecting portion. 3. The pipe joint according to claim 2, wherein an axis of said pipe receiving portion is eccentric. 4. apical lateral direction width of the tube connecting portion (d ₂₎ is 0.5d ₁ <d ₂ <0 the diameter of the main pipe (d _1).
The pipe joint according to any _one of claims 1 to 3, which is 78d1. 5. The width (d ₄ ) in the longitudinal direction of the root end of the pipe connection is 1.5 d with respect to the width (d ₂ ) in the width direction of the root end of the pipe connection.
The pipe joint according to claim 1, wherein ₂ <d ₄ ≦ 2d _2.