JPH1068492A - Electro-fusion type branching saddle joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and surely connect and embed the piping by raising a branched pipe from an upper surface in the center of a saddle, bending the branch pipe in the horizontal direction at the position close to the saddle, and embedding a heating wire in a back side of the saddle. SOLUTION: A branch pipe 12 is raised from an upper surface of a center part of a saddle 11 which is curved with equal curvature to that of an outer surface of a main pipe 3, and a heating wire 2 is embedded in a back side of the saddle 11 with the prescribed intervals. Each end part of the heating wire 2 is connected to a terminal pin projected from an upper surface of the saddle 11. An annular projection 10 is provided on a circumferential edge of a through hole to be communicated with the branch pipe 12. The branch pipe 12 is bent horizontally in the direction orthogonal to the main pipe 3 at the position close to the saddle 11, and a socket 13 is installed at an end part of the branch pipe 12. The heating wire is embedded also in an inner surface of the socket 13 with the prescribed intervals, and each end part of the heating wire is connected to a terminal pin 130 projected from an outer surface of the socket 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrofusion type branch saddle joint which can easily and reliably take out a branch pipe from a main pipe made of synthetic resin.

[0002]

2. Description of the Related Art Conventionally, in the field of piping such as gas pipes and hot water supply pipes, synthetic resin pipes such as polyethylene and polybutene have been used. A connecting electrofusion joint is used.

[0003]

For example, when a branch pipe is taken out of a main pipe made of synthetic resin, a branch saddle joint 1a as shown in FIG. 3 is used. In the branch saddle joint 1a, a heating wire 2 is buried on the back surface of a synthetic resin saddle 11a curved with substantially the same curvature as the outer surface of the main pipe 3, and a branch pipe 12a protruding from a substantially central upper surface of the saddle 11a. Horizontal branch pipe 1 that projects horizontally in the middle of
2b is provided. Further, a female screw is engraved on the inner surface of the vertically raised branch pipe 12a, and a cutter 15 is screwed onto an upper end of the female screw.

When the branch pipe 4 is taken out of the main pipe 3 made of synthetic resin by using the branch saddle joint 1a, a saddle 11a is placed on the upper surface of the main pipe 3, and the heating wire 2 embedded in the back of the saddle 11a is connected to the heating wire 2. Electric current is applied for fusion bonding. Next, cutter 1
5 is pressed down while rotating it, and a through hole is formed in the pipe wall of the main pipe 3 and then pulled up. Therefore, the upper end of the branch pipe 12a is closed by the cap 16, and the horizontal branch pipe 12a is closed.
The branch pipe 4 was connected to the end of b.

However, this conventional branch saddle joint is
When the main pipe 3 is backfilled because the branch pipe 12a becomes longer,
The excavation groove must be deep so that the upper end of the branch pipe 12a does not protrude from the ground surface. For this reason, the excavation work of the trench sometimes required labor and a long time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to perform a buried pipe even when the depth of the excavation groove is shallow, and to easily and reliably take out a branch pipe from the main pipe. A joint is provided.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a branch pipe is set up from a substantially central upper surface of a curved synthetic resin saddle, and the branch pipe is bent horizontally at a position close to the saddle. A heating wire is embedded at a predetermined interval on the back surface of the saddle made.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an electro-fused branch saddle joint according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the branch saddle joint shown in FIG. A branched saddle joint made of a synthetic resin such as polyethylene or polybutene, 2 is a heating wire, 3 is a main pipe, and 4 is a branch pipe.

The branch saddle joint 1 has a structure in which a branch pipe 12 is raised from a substantially central upper surface of a saddle 11 curved with a curvature substantially equal to the outer surface of the main pipe 3.
Heating wires 2 are buried at a predetermined interval on the back surface of 1.
The heating wire 2 is made of a nichrome wire, a copper wire, a nickel wire, a copper nickel wire or the like having a wire diameter of about 0.3 to 1.5 mm, and both ends of the terminal pin 110 projecting from the upper surface of the saddle 11.
Is connected to On the back surface of the saddle 11, an annular projection 10 is provided on the periphery of a through hole communicating with the branch pipe 12.

[0010] Branch pipe 1 raised from the upper surface of saddle 11
2 is horizontally bent in a direction perpendicular to the main pipe 3 at a position close to the saddle 11, and a receiving port 13 is provided at an end of the branch pipe 12. The heating wire 2 is buried at a predetermined interval in the inner surface of the receiving port 13 as described above, and both ends of the heating wire 2 have terminal pins 1 protruding from the outer surface of the receiving port 13.
30.

When the branch pipe 4 is taken out of the main pipe 3 by using the branch saddle joint 1, the ground is dug to form a groove, and the main pipe is laid along the cut groove as in the conventional case. In the branch saddle joint 1 of the present invention, since the height of the branch pipe 12 rising from the upper surface of the saddle 11 is low, the groove can be made shallower than in the related art. Next, a through hole 31 is formed at an appropriate position of the main pipe 3 from which the branch pipe 4 is taken out. Then, the back surface of the saddle 11 of the branch saddle joint 1 is pressed against the outer surface of the main pipe 3, and the annular projection 10 provided on the back surface of the saddle 11 is fitted into the through hole 31. By doing so, the positioning of the branch saddle joint 1 with respect to the through hole 31 can be accurately performed.

Next, a power supply is connected to terminal pins 110 protruding from the upper surface of the saddle 11, and a heating wire 2 embedded in the rear surface of the saddle 11 is energized to fuse the back surface of the saddle 11 to the outer surface of the main tube 3. I do. Then, when the end of the branch pipe 4 is inserted into the receptacle 13 of the branch pipe 12 and the heating wire 2 buried in the inner surface of the receptacle 13 is heated in the same manner as described above, through the branch saddle joint 1 of the present invention. The main pipe 3 and the branch pipe 4 are firmly fusion-bonded.

[0013]

As described above in detail, in the electrofusion type branch saddle joint of the present invention, the branch pipe raised from the upper surface of the synthetic resin saddle is horizontally bent at a position close to the saddle. The trench for burying the pipe can be made shallow, so that the trench can be easily drilled. Also, the branch saddle joint can be fusion-bonded to the main pipe simply by applying a current to the heating wire embedded on the back surface of the saddle. It can be done reliably.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electrofusion type branch saddle joint according to an embodiment of the present invention.

FIG. 2 is a sectional view of the branch saddle joint shown in FIG.
It is a line sectional view.

FIG. 3 is a sectional view showing a conventional branch saddle joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Branch saddle joint 11 Saddle 12 Branch pipe 2 Heating wire 3 Main pipe 4 Branch pipe

Claims (2)

[Claims] 1. A branch saddle joint for use in taking out a branch pipe (4) from a main pipe (3), the synthetic resin saddle (11) being curved with a curvature substantially equal to the outer surface of the main pipe (3).
The branch pipe (12) is raised from substantially the upper surface of the center of the pipe, and the branch pipe (12) is positioned close to the saddle (11).
Bend in the horizontal direction, and a saddle made of synthetic resin (11)
An electric fusion type branch saddle joint characterized in that a heating wire (2) is buried at a predetermined interval on the back surface of the joint. 2. An electro-fused branch saddle joint, wherein the branch pipe (12) is bent in a direction perpendicular to the main pipe (3).