JP2004232729A - Joint for taking out branch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint for taking out a branch, solving problems of a conventional joint for taking out a branch and joining a saddle part firmly to an upper surface of a main pipe. <P>SOLUTION: In the joint 1 for taking out the branch having the saddle part 2 formed of resin as a whole, having an electric heating wire 6 embedded therein to be a fusion-bonding means bonded to the main pipe 10, and straddling the main pipe 10, and a branching pipe receiving part 3 extending from the saddle part 2 to the Z direction orthogonal to a pipe axis X of the main pipe 10 and receiving a branching pipe having an outer diameter equal to that of the main pipe 10, the saddle part 2 has a base body part 21 covering a part beyond a semicircle periphery of the main pipe 10 and leg parts 23 projecting from both its ends in the radial direction, and parts 22 near the leg parts of the base body part 21 are more thinly formed than the other part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a branch take-out joint used to take out, for example, a resin branch pipe having substantially the same diameter as a resin base pipe through which gas flows.
[0002]
[Prior art]
In a gas pipe, etc., in order to be able to easily take out the resin branch pipe from the resin base pipe buried in the ground and in a state where gas flows, for example, a saddle type joint is attached to the main pipe, and the BACKGROUND ART A horizontal branch is taken out from a vertically drilled hole in the center (see Patent Document 1). That is, to provide a saddle-type joint provided with a cylindrical body having a female screw formed on the inner peripheral surface on the side of the saddle portion, having a male screw to be screwed with the female screw, and a forsaw having a cutting blade at a lower portion thereof. After fusing the saddle-type joint to the outer peripheral surface of the resin-made main pipe, the side of the outer peripheral surface of the resin-made main pipe is cut with a forsaw and rotated vertically with respect to the buried original pipe. By drilling from the direction, the resin base tube and the resin branch tube communicate with each other. With the saddle type joint, it is required to connect a resin branch pipe of the same size to the resin base pipe and to branch and take out a large flow rate. In the case of branching and taking out a large flow rate as described above, a large-diameter forsaw is used, so that the entire structure including the cylindrical portion becomes large and the thickness of each portion needs to be increased. In addition, to simplify the joining work between the saddle-type joint and the resin base pipe, a resin branch joint with a heating wire embedded in the saddle section is manufactured, and the inner peripheral surface of the saddle section is fitted to the outer peripheral surface of the main pipe. After mounting, the resin heating pipe and the branch joint are fused by energizing the heating wire. When using this joint, it is important that the inner peripheral surface of the saddle portion be in close contact with the outer peripheral surface of the main pipe. In order to bring the inner peripheral surface of the saddle into close contact with the outer peripheral surface of the resin pipe by means of a clamp, a saddle made of resin with a heating wire embedded in the inner peripheral part, and a peripheral wall of the saddle A structure has been proposed in which a branch pipe is provided integrally toward the outside, and the saddle has a structure in which the thickness of the other part is smaller than the thickness of the peripheral part of the branch pipe. (See Patent Document 2).
[0003]
[Patent Document 1]
JP-A-11-159683 (page 2, FIG. 8)
[Patent Document 2]
JP-A-11-170372 (page 2-3, FIG. 5)
[0004]
[Problems to be solved by the invention]
However, in the electrofusion saddle type joint described in Patent Document 2, the saddle portion only covers a range of about 1/4 circumference of the main pipe, and the saddle type joint is used to form the same as the gas main pipe. When taking out a branch pipe having a diameter, there is a problem that the saddle portion cannot be firmly joined to the outer peripheral surface of the main pipe.
[0005]
Accordingly, an object of the present invention is to solve the problems of the conventional branch take-out joint and to provide a branch take-out joint capable of firmly joining the saddle portion to the outer peripheral surface of the main pipe.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the branch take-out joint of the present invention is entirely formed of resin, includes a means for fusing with the main pipe, and a saddle section laid over the main pipe, and A branch pipe receiving joint that extends in a direction intersecting (for example, perpendicular to) the pipe axis of the main pipe and that receives a branch pipe having an outer diameter equal to that of the main pipe; It has a base portion that covers a semicircle or more of the base tube and legs that protrude radially from both ends thereof, and the portion of the base portion beyond the legs is formed to be thinner than other portions. It has a configuration.
In the branch take-out joint, it is preferable that the leg has an end surface that comes into contact with an outer peripheral surface of the main pipe.
In the branch take-out joint, it is preferable that a perforated pipe portion accommodating a cutter for perforating a portion of the main pipe facing the branch pipe receiving portion is formed below this portion.
[0007]
According to the present invention, since the saddle portion formed of the resin has the semicircular base portion, the contact area with the base tube becomes large, and the portion of the base portion from the leg portion is more than other portions. Since it is formed to be thin, a moderate spring property is given to the saddle portion. Since the saddle portion has legs protruding in the radial direction on both sides of the semicircular base portion, when the saddle portion is pushed into the main pipe, a force acts on the saddle portion in a direction to close the saddle portion. Therefore, the saddle portion is firmly joined to the main pipe. Since the leg portion has an end surface that comes into contact with the outer peripheral surface of the main tube, the saddle portion is guided by this end surface and is quickly pushed toward the main tube.
By forming the perforated pipe portion for accommodating the cutter for perforating the portion facing the branch pipe receiving portion of the main pipe below this portion, the height of the portion protruding from the saddle portion can be suppressed. . Therefore, even in a state where the main pipe is buried shallowly, it is possible to perform branch extraction pipe.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a branch take-out joint according to an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. It is a side view.
[0009]
1 and 2, reference numeral 1 denotes a branch take-out joint (hereinafter referred to as a branch joint) mounted on a side of a main pipe 10 (shown by a broken line in FIG. 1) buried underground. The branch joint 1 is formed of a resin (for example, polyethylene) of the same or the same system as the main pipe 10, and has a C-shaped saddle member 2 having a radius of curvature such that the inner peripheral surface is in close contact with the outer peripheral surface of the main pipe 10. A branch pipe receiving portion 3 having an axis Z orthogonal to the axis X of the main pipe 10 and connected to a branch pipe (not shown); And an upper tube portion 5 formed coaxially with the axis Y of the perforated tube portion 4. The saddle member 2 includes a base 21 having an arc-shaped (angle θ) cross-sectional shape, legs 23 (angle θ ₃ ) projecting radially at both ends in the circumferential direction, and inner legs of the base 21. The thin portion 22 includes a portion (angle θ ₂ ) from the portion 23 where the thickness (t ₂ ) is smaller than the thickness (t ₁ ) of the other portion (angle θ ₁ ). The end surface 23a of the leg 23 is formed in an arc shape, and the bottom surface 23b is formed in a plane. A perforated cutter 7 having a screw shaft 70 having a hole (for example, a hexagonal hole) 71 fixed to the upper end thereof is housed inside the perforated tube 4, and the lower end of the perforated tube 4 is provided with, for example, a cap. 41 is fixed by butt fusion, and the lower end surface is sealed. A ring-shaped guide member 8 for guiding a drive shaft (not shown) connected to the screw shaft 70 is provided in the upper tube portion 5, and the upper end surface is sealed with a screw cap 9. The fusion portion 24 (see FIG. 2) in which the heating wire 6 is embedded is a portion formed at both ends of the base portion 21 along the axis X direction of the main pipe 10, and is used to supply power to the heating wire 6. Connector pin 25 and an indicator 26 for indicating completion of fusion.
[0010]
INDUSTRIAL APPLICABILITY The present invention is particularly effectively applied to a branch taking-out pipe from a small-diameter (nominal diameter: 50A to 100A) main pipe. In such a small-diameter branch take-out pipe, in order to facilitate elastic deformation of the saddle portion, in FIG. 1, t ₂ is set to 0.4 to 0.6 times t ₁ and θ ₂ > θ. it is preferable to satisfy the ₃ following relationship. These values are, for example, in the case of the main pipe 10 having a nominal diameter of 50 A (thickness: 6 mm), t ₁ : 10 mm, t ₂ : 4 mm, θ ₁ : 180 °, θ ₂ : 25 °, θ ₃ : 15 Set to °.
[0011]
According to the branch joint 1, the branch pipe can be taken out, for example, in the following procedure. The branch joint 1 is arranged on the side of the main pipe 10 such that the end surface 23a of the leg 23 comes into contact with the outer peripheral surface of the main pipe 10. For example, the hook 11 is locked to the leg 23 of the branch joint 1, By pulling the hook 11 in the direction of arrow B in the drawing, the branch joint 1 is pushed toward the main pipe 1 (see FIG. 3). As a result, the thin portion 22 is elastically deformed and opens vertically. Further, when the hook 11 is pulled in the direction of the arrow B in the drawing until the inner peripheral surface of the thin portion 22 comes into contact with the outer peripheral surface of the main pipe 1, a force in the direction of closing the thin portion 22 acts on the thin portion 22 due to the presence of the legs 23. Therefore, the thin portion 22 and the fusion portion 24 adhere to the main tube 10 (see FIG. 1). Next, a power source (not shown) is connected to the connector pin 25 and the heating wire 6 is energized to fuse and fix the joint 1 to the main pipe 10. When the fusion is completed, the indicator 26 rises, and this can be visually confirmed. Thereafter, a branch pipe (not shown) is connected to the branch pipe receiving portion 3. Finally, a drive shaft (not shown) is inserted from the guide hole 81 of the guide member 8, and the tip (for example, hexagonal shape) of the drive shaft (not shown) is inserted into the hole 71 of the screw shaft 70 inserted into the perforated tube 4. (Having a cross-sectional shape), and the cutter 7 is rotated to pierce the original pipe 10. After piercing, the cutter 7 is rotated in the opposite direction to the above to return to the original position. A cap 9 is put on the upper end surface of the device and hermetically closed. In FIG. 3, the branch joint 1 may be pushed toward the main pipe 10 without using the hook 11.
[0012]
According to the branch joint 1, the perforated pipe portion 4 in which the cutter 7 for perforating the portion of the main pipe 10 facing the branch pipe receiving portion 4 is formed below the perforation opening, so that the saddle portion 21 is formed. The height of the portion (upper pipe portion 5) projecting toward the surface of the ground can be reduced. Therefore, even in a state where the main pipe 10 is buried shallowly, it is possible to perform branch extraction pipe.
[0013]
【The invention's effect】
As described above, according to the present invention, the saddle portion has the base portion covering the semicircle or more of the base pipe and the leg portions projecting radially from both ends thereof, and the portion of the base portion from the leg portion. Is formed thinner than the other parts, the saddle part is firmly joined to the upper surface of the main pipe. Therefore, in taking out the branch pipe having the same outer diameter as the main pipe, highly reliable piping can be performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a branch take-out joint according to an embodiment of the present invention.
FIG. 2 is an arrow view of FIG. 1 viewed from a direction A.
FIG. 3 is a side view showing a step of attaching the joint of FIG. 1 to a main pipe.
[Explanation of symbols]
1: Joint for branch removal 2: Saddle portion 21: Base portion 22: Thin portion 23: Leg portion 23a: End surface 23b: Bottom surface 24: Fused portion 25: Connector pin 26: Indicator 3: Branch tube receiving portion 4: Perforated tube Part 41: Cap 5: Upper pipe part 6: Heating wire 7: Cutter 70: Screw shaft 71: Hole 8: Guide member 81: Guide hole 9: Screw cap 10: Main pipe

Claims (3)

A saddle portion that is entirely formed of resin and includes a means for fusing with the main pipe and is laid across the main pipe, and extends from the saddle section in a direction intersecting with the pipe axis of the main pipe, and In a branch taking-out joint having a branch pipe receiving portion receiving a branch pipe having an equivalent outer diameter, the saddle portion is a base portion that covers a semicircle or more of the base tube and legs that protrude radially from both ends thereof. A joint for taking out a branch, wherein the joint has a portion, and a portion of the base portion from a leg portion is formed thinner than other portions. 2. The joint according to claim 1, wherein the leg portion has an end surface that comes into contact with an outer peripheral surface of the main pipe. 2. The joint according to claim 1, wherein a perforated pipe portion for accommodating a cutter for perforating a portion of the main pipe facing the branch pipe receiving portion is formed below the portion. 3.

Images