JP4450918B2 - Pipe fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint that connects 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 the sewage pipe, the flow rate of the branch pipe must be smaller than that 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 is often 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]
[Prior art]
Conventionally, in order to connect a main pipe and a branch pipe, for example, a saddle T-shaped pipe joint (61) including a pipe connecting portion (66) shown in FIG. 13 and a saddle portion (62) as a main pipe attaching portion is provided. . To connect the branch pipe to the main pipe with the saddle T-shaped pipe joint (61), a hole is made in the connection portion of the main pipe, and the saddle T-type pipe joint is contacted and fixed to the main pipe, and then the branch pipe is connected to the main pipe. By inserting it at the end of the part.
[0004]
[Problems to be solved by the invention]
Such a pipe joint (61) is applied only when the diameter of the branch pipe (14) is smaller than the diameter of the main pipe (13), and the diameter of the conventional branch pipe is equal to the diameter of the main pipe. No pipe fitting was provided to connect the branch pipe to the main pipe when it was larger.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a pipe joint ( 21 ) for connecting a branch pipe (14) having a diameter equal to or larger than the diameter of the main pipe (13) to the main pipe (13). made from saddle portion (22) the pipe connection portion being proffered from the opening (24) of the saddle (22) and (23), said saddle opening of (22) (24) at both ends and a half The tube connecting portion ( 23 ) has a short end width d _{2 which} is smaller than the diameter d ₁ of the main pipe (13) and a long width d _{4 which} is the diameter of the branch pipe (14). The diameter is set to be larger than the diameter d _3, and the pipe connection part (23) is formed with a pipe receiving part (28) with an enlarged diameter, and the pipe receiving part (28) A locking step (29A, 29B) for receiving the branch pipe (14) connected to the pipe receiving part (28) is provided on the inner peripheral surface of the rear end of the pipe receiving part (28). Furthermore, the axial center of the receiving portion (28) is shorter than the axial center of the pipe connecting portion (23). There is provided a pipe joint (21) by a predetermined amount eccentric direction.
In the pipe joint ( 21 ), the width d _{2 in the} short end direction of the pipe connecting portion ( 23 ) is 0.5d ₁ <d ₂ <0.78d ₁ with respect to the diameter d ₁ of the main pipe (13). Preferably, the root end longitudinal width d ₄ of the pipe connecting portion (3, 23) is 1.5d ₂ <with respect to the root end lateral width d ₂ of the pipe connecting portion (3, 23). It is desirable that d ₄ ≦ 2d ₂ .
[0006]
[Action]
An opening H is provided at a branch pipe connecting portion of the main pipe (13), and the pipe joint ( 21 ) of the present invention is attached to the opening H via a saddle part ( 22 ). The opening ( 24 ) of the saddle portion ( 22 ) has a semicircular elongated hole shape at both ends, and a pipe connecting portion ( 23 ) is extended from the opening ( 24 ). Since the width d ₂ of the pipe joint ( 21 ) in the short end direction is smaller than the diameter d _{1 of the} main pipe (13), the pipe of the main pipe (13) is also provided at the opening H of the main pipe (13). The central angle θ with respect to the circumference is larger than 180 °, and the strength reduction of the opening portion of the main pipe (13) is small due to the rib effect on the pipe top.
Further, since the root end longitudinal width d ₄ of the pipe joint ( 21 ) is larger than the diameter d ₃ of the branch pipe (14), the water flow is kept smooth.
[0007]
Further, if the axis AX _{1 of the} tube receiving portion ( 28 ) is eccentric, it can be connected even when the axes of the main pipe (13) and the branch pipe (14) do not cross each other. The degree of freedom increases.
[0008]
Tube connecting portion in the fitting (21) from the root end lateral direction width d ₂ is the main pipe (23) (13) 0.5d ₁ larger than the branch pipe relative to the diameter d ₁ (14) can be ensured smooth water flow to the main pipe (13), securely maintain the strength of 0.78D ₁ smaller than main aperture. The present the apical longitudinal width d ₄ of the tube connecting portion (23) is a 1.5d ₂ <d ₄ ≦ 2d ₂ against the root end lateral direction width d ₂ of the tube connecting portion (23) Drilling work of the pipe (13) and mounting work of the pipe joint ( 21 ) to the main pipe (13) are facilitated.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it shows the one reference example in FIG. 1-9.
The main pipe joint (1) shown in FIG. 1 includes a saddle portion (2) having an arcuate cross section having a curvature adapted to the outer peripheral curved surface shape of the main pipe, and an opening (4) of the saddle portion (2). It consists of a pipe connection part (3) that has been pushed out.
[0010]
The root end portion of the pipe connecting portion (3) penetrates the saddle portion (2) to form a flange (7). The flange (7) prevents the main pipe (13) and the pipe joint (1) from being displaced, and also ensures the connection between the pipe connection (3) of the main pipe (13) and the pipe joint (1). To prevent water leakage.
[0011]
The pipe connection part (3) is formed with a pipe receiving part (8) having an enlarged diameter. The tube receiving portion (8) has a taper shape that expands deeply, and a branch pipe (8) connected to the tube receiving portion (8) is formed on the inner peripheral surface of the rear end of the tube receiving portion (8). An engaging step portion (9) for receiving 14) is provided, and a rubber ring mounting groove (10) is formed at the tip of the tube receiving portion (8).
[0012]
As shown in FIGS. 2 to 5, the pipe connecting part (3) is expanded in the longitudinal direction (main pipe axis direction) below the locking step part (9) , and is short-sided (main pipe axis orthogonal) is reduced in diameter direction), the root end lateral direction width d ₂ is greater than the diameter d ₃ of the small longitudinal width d ₄ is the branches tube than the diameter d ₁ of the main pipe (13) (14) Is set .
[0013]
In the pipe joint (1), the shape of the opening (4) of the saddle portion (2) is a semicircular oblong hole shape OV on both ends formed by connecting a pair of left and right tangents parallel to the main pipe axis. is a distance between the centers of the pair of the circle of the long circular OV is greater than d _2/2 relative to the root tip lateral direction width d ₂ of the tube connecting portion (3), the main pipe diameter d ₁ 1.5d ₁ preferably is set smaller than d ₁ for. Further, the root end longitudinal direction width d ₄ is set to 1.5d ₂ <d ₄ ≦ 2d ₂ with respect to the root end short direction width d ₂ .
The cross-sectional area of the OV is set to be equal to or larger than the cross-sectional area of the branch pipe (14).
This ensures a smooth water flow from the branch pipe (14) to the main pipe (13).
[0014]
In order to connect the main pipe (13) and the branch pipe (14) by the pipe joint (1), the receiving position of the branch pipe (14) is set on the main pipe (13) according to the field situation as shown in FIG. Determine the saddle part (2) and open a hole with a semicircular long hole shape OV ′ whose diameter is larger by α than the opening part (4). In order to open the semicircular oblong hole shape OV ′ on both ends, the circles C ₁ and C ₂ are usually drilled with a horuseau, and then along a pair of left and right tangents connecting the circles C ₁ and C ₂ parallel to the main pipe axis. It cuts and deletes the part D between holes.
[0015]
In this case, the distance c between the centers of the pair of circles C ₁ and C ₂ of the oval shape OV ′ is relative to the width d _{2 in the} short end direction of the pipe connecting portion (3) and the diameter d _{1 of the} main pipe. (D ₂ + α) / 2 <c <1.5d ₁ , preferably (d ₂ + α) / 2 <c <(d ₂ + α). When set in this way, drilling work into the main pipe (13) becomes easy. Circle C _1, C distance c is the circle C ₁ between the centers of _2, C ₂ 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 Since the circle C ₂ to be drilled later is located inside, the hole saw shaft cannot be fixed and cannot be drilled. In addition, as shown in FIG. 8, when the distance c between the centers of the circles C ₁ and C ₂ is 1.5 d ₁ or more, the two holes are too far apart and it takes time to cut the inter-hole portion D.
[0016]
The diameters d ₅ (d ₂ + α) of the circles C ₁ and C ₂ are 0.5d ₁ + α <d ₅ <0.78 d ₁ + α, preferably 0.65d ₁ + α <d with respect to the diameter d ₁ of the main pipe. ₅ <0.78d ₁ + α is set. 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. When the diameter d _{5 of} the circles C ₁ and C ₂ is 0.5 d ₁ + α or less, the branch pipe (14 ) To the main (13) is not smooth. When inserting a tube having a nominal diameter of 100 (outer diameter: 114 mm, inner diameter: 107 mm), if a hole diameter of 100 mm is used, the hole diameter is 117 to 120 mm, and in this embodiment, α is set to 10 to 13 mm. .
[0017]
As shown in FIG. 9, the flange (7) of the pipe joint (1) is inserted into the hole thus opened, and the saddle portion (2) of the pipe joint (1) is connected to the outer surface of the main pipe (13). And fixed with a clamp or band. Or you may adhere | attach with an adhesive agent.
[0018]
Next, the branch pipe (14) is inserted into the pipe receiving part (8). The pipe end of the inserted branch pipe (14) is received by the locking step (9). If the tube receiving portion (8) has a taper shape that expands to the back, it is movable in the radial direction when an external force is applied to the branch pipe (14), so the external force is absorbed to absorb the branch pipe (14) and the pipe. Damage to the receiving part (8) can be prevented. A rubber ring (12) is mounted in the rubber ring mounting groove (10) to fix the inserted branch pipe (14) and to seal between the pipe receiving portion (8) and the branch pipe (14). Maintaining sex.
[0019]
The pipe joint (1) of the present invention is made of, for example, a synthetic resin such as polyvinyl chloride, polyethylene, polypropylene, etc., and the saddle part (2) and the pipe connection part (3) may be formed by integrally molding the plastic or the like. However, it may be bonded after being molded separately.
[0020]
It shows the embodiment of the present invention in FIG. 10-13.
The main pipe joint (21) shown in FIG. 10 includes a saddle portion (22) having an arcuate cross-sectional arc shape having a curvature adapted to the outer peripheral curved surface shape of the main pipe, and an opening (24) of the saddle portion (22). It consists of a pipe connection part (23) led out from. The pipe connection part (23) is formed with a pipe receiving part (28) having an enlarged diameter, and the pipe receiving part (28) is formed in a taper shape which is widened to the back. Locking step portions (29A) and (29B) for receiving the branch pipe (14) connected to the tube receiving portion (28) are provided on the inner peripheral surface of the rear end of the tube receiving portion (28). A rubber ring mounting groove (30) is formed at the tip of the tube receiving part (28).
As shown in FIGS. 11 and 12, the pipe connecting portion (23) is expanded in the longitudinal direction below the locking step portions (29A) and (29B) in the same manner as in the above reference example, and in the short direction. The width d ₂ of the root end in the short end direction is set smaller than the diameter of the main pipe (13), and the width d _{4 in} the longitudinal direction is set larger than the diameter d ₃ of the branch pipe (14) .
The shape of the opening (24) of the saddle portion (22) of the pipe joint (21) is the same as in the reference example.
Furthermore the tube socket portion as shown in FIGS. 10 to 12 (28) whereas the axis of the lateral direction (main saddle portion from the axis AX ₂ of the pipe connecting portion and the axial core AX ₁ (23) In the right-angled direction) and decentered by l. This way the branch pipe (14) can be connected even when the axis is the main (13) the axis AX ₃ of (tube socket portion axis AX ₁ of the (28)) are shifted without intersection of the pipe The degree of freedom increases.
[0021]
In the pipe joint (21) of this embodiment, the locking step (29A) in the eccentric direction is large and the locking step (29B) on the opposite side to the eccentric direction is small. When the pipe (14) is inserted, as shown in FIG. 13 , the inner peripheral surface of the branch pipe (14) and the wall surface of the pipe connecting portion (23) are substantially in a straight line, and no reverse gradient is generated by the locking step portion (29B). . Therefore, even when the pipe connection part (23) is installed horizontally, the water flow is kept smooth and piping can be constructed even when the main pipe is shallowly buried.
[0022]
The present invention is not limited to the above-described embodiment, and it is sufficient that the width in the short direction of the root end of the pipe connecting portion is smaller than that of the main pipe and the length in the longitudinal direction of the root end of the pipe connecting portion is larger than the diameter of the branch pipe. Further, the pipe connecting portion may be bent or bent. Further, the tube receiving part may be a universal joint or an insertion part. The material is not limited to plastic and may be manufactured from metal, ceramic, or the like.
[0023]
The pipe joint of the present invention may be applied not only to the connection between the main pipe and the branch pipe, but also to a pipe-to-pipe connection portion such as a pipe connection when an inspection tube is installed or drained.
[0024]
【The invention's effect】
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 is connected without securing the strength of the main pipe and without disturbing the smooth water flow from the branch pipe to the main pipe. Can do. In addition, when the axis of the tube receiving portion is eccentric, it can be connected even if the main and branch pipes are misaligned, and the degree of freedom of piping is increased. In addition, since a reverse gradient due to the locking step portion does not occur, piping can be constructed while maintaining a smooth water flow even when the main pipe is shallowly buried.
[Brief description of the drawings]
1 to 9 show a reference example of the present invention.
[Figure 1] Pipe joint perspective view [Figure 2] Pipe joint front sectional view [Figure 3] Pipe joint side sectional view [Figure 4] Pipe joint top view [Figure 5] Pipe joint rear view [Figure 6] Main pipe drilled state description section an embodiment of a plan view and FIG. 7 is mains punching state described partial plan view 8 main punching state described partial plan view and FIG. 9 branch connection state front sectional view showing 10-13 present invention Is shown.
[10] fitting front sectional view and FIG. 11 fitting side sectional view [12] fitting plan view 13 branch connection state sectional front view [Figure 14] pipe joint perspective view of a conventional example [code Explanation of]
21 pipe fittings
22 saddle club
23 pipe connections
28 pipe socket 13 main 14 branch AX ₁ axial d _1, d ₃ diameter d ₂ short direction width d ₄ longitudinal width

Claims (3)

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 connecting portion that is extended from the opening of the saddle portion, The opening of the saddle portion has a semicircular elongated hole shape at both ends, and the width in the short end direction of the pipe connecting portion is smaller than the diameter of the main pipe and the width in the longitudinal direction is set larger than the diameter of the branch pipe. The pipe connection part is formed with a diameter-expanding pipe receiving part, and the pipe receiving part has a taper shape that expands to the inside. A latching step for receiving the branch pipe connected to the pipe receiving part is provided, and the axial center of the receiving part is shorter than the axial center of the pipe connecting part. A pipe joint characterized by being eccentric by a predetermined amount . _2. The pipe joint according to claim ₁ , wherein a width (d ₂ ) in a root end short direction of the pipe connecting portion is 0.5 d ₁ <d ₂ <0.78 d _{1 with} respect to a diameter (d ₁ ) of the main pipe. . Root tip longitudinal width of the tube connecting portion (d ₄₎ is according to claim 1, wherein a 1.5d ₂ <d ₄ ≦ 2d ₂ against the root end lateral direction width of the tube connecting portion (d ₂₎ Item 3. The pipe joint according to Item 2 .

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