JPH091669A - Electric fusion joint - Google Patents

Abstract

PURPOSE: To accurately perform the alignment to a pipe to be connected by providing the marking displaying the relative position with the marking provided to the pipe to be connected to a joint main body. CONSTITUTION: The pipe peripheral direction position display marking 11A displaying the relative position with the pipe peripheral direction position display marking 1A provided to a pipe 1 to be connected is provided to an electric fusion saddle 10 at the position corresponding to the branch pipe 12 in the curving direction of a joint main body 11 and both markings are allowed to coincide with each other. The pipe axial direction position display marking 11B displaying the relative position with the pipe axial direction position display marking 1B provided to the pipe 1 to be connected is provided to the joint main body 11 at the position corresponding to the branch pipe 12 in the curving right-angled direction of the joint main body 1 and both markings are allowed to coincide with each other. By allowing the markings 11A, 11B provided to the joint main body 11 to coincide with the markings 1A, 1B provided to the pipe l to be connected, the alignment of both of them can be accurately performed. Further, the taking-out position of the branch pipe 12 of the saddle 10 can be accurately determined in the peripheral and axial directions of the pipe 1 to be connected by using the markings 11A, 11B.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electrofusion joint.

[0002]

2. Description of the Related Art As described in Japanese Examined Patent Publication No. 1-40743, an electric fusion splicer is used to join a pipe to be connected to a joint body.
The heating wire is built into the joint body made of thermoplastic resin, and the surface of the pipe to be connected is also made of thermoplastic resin.The surface resin layer of the pipe to be connected is superposed on the surface resin layer of the joint body, and both are aligned. Then, the heating wire is energized in a clamped state to fuse the resin layer of the joint body and the resin layer of the connected pipe.

However, in the prior art, the positioning of the joint body such as the saddle, cheese, and elbow with respect to the pipe to be connected is performed only by the operator's intuition, relying on the bending of the saddle or cheese branch pipe and elbow. .

[0004]

However, in the prior art, since the position of the joint body with respect to the pipe to be connected is adjusted by the operator's intuition, it is not accurate and has the following problems. It is not possible to accurately determine the takeout position of the branch pipe of the saddle or cheese in the pipe circumferential direction and pipe axial direction of the pipe to be connected.

The mounting position of the elbow cannot be accurately determined in the pipe circumferential direction of the connected pipe, and as a result, the rising direction of the connected pipe connected by the elbow cannot be accurately determined.

An object of the present invention is to accurately align an electric fusion joint with a pipe to be connected.

[0007]

According to a first aspect of the present invention, a heating wire is built in a joint body, the joint body is aligned with the connected pipe, and the joint body and the connected pipe are electrically connected. In an electric fusion joint that is fused and joined, a joint body is provided with a marking for indicating a relative position to a marking provided on a pipe to be connected.

[0008]

According to the first aspect of the present invention, the following effects are obtained. By aligning the markings provided on the joint body with the markings provided on the pipe to be connected, the two can be accurately aligned.

By using the pipe circumferential direction position indication marking and the pipe axis direction position indication marking provided on the saddle, the take-out position of the branch pipe of the saddle can be accurately determined in the pipe circumferential direction and the pipe axis direction of the pipe to be connected. You can

By using the pipe circumferential direction position marking provided on the cheese, the extraction position of the cheese branch pipe can be accurately determined in the pipe circumferential direction of the connected pipe.

By using the pipe circumferential direction position marking provided on the elbow, the rising direction of the connected pipe connected by the elbow can be accurately determined.

[0012]

1 is a schematic view showing a first embodiment in which the present invention is applied to a saddle, FIG. 2 is a schematic view showing a second embodiment in which the present invention is applied to cheese, and FIG. 3 is an elbow in the present invention. It is a schematic diagram which shows the applied 3rd Example.

(First Embodiment) (FIG. 1) The electrofusion saddle 10 is provided with a branch pipe 12 in a curved plate-shaped joint body 11 which matches the outer diameter curvature of the pipe 1 to be connected. And
The entire saddle 10 including the inner surface of the joint body 11 is a resin layer such as polyethylene, and a heating wire 13 (not shown) is embedded in this resin layer. The heating wire 13 is embedded in a circumferential shape surrounding the branch pipe 12, and is provided with terminals 14A and 14B connected to both ends of the heating wire 13 at positions corresponding to the branch pipe 12 at both ends of the joint body 11.

The saddle 10 has a pipe circumferential position indicating marking 11A indicating a relative position with the pipe circumferential position indicating marking 1A provided on the connected pipe 1 at a position corresponding to the branch pipe 12 in the bending direction of the joint body 11. It is provided. The pipe circumferential direction position markings 11 </ b> A are provided on both sides of the branch pipe 12. Further, the saddle 10 has a pipe axis direction position display marking 11B indicating a relative position with a pipe axis direction position display marking 1B provided on the connected pipe 1 at a position corresponding to the branch pipe 12 in the direction perpendicular to the bending of the joint body 11. It is provided. The pipe axis direction display marking 11B is the branch pipe 12
Are provided on both sides of the.

At this time, the pipe 1 to be connected is entirely made of a resin layer such as polyethylene including the outer diameter surface.

The procedure for joining the saddle 10 will be described below. (1) Pipe circumferential direction position marking 11A on the joint body 11
Is aligned with the pipe circumferential direction position marking 1A of the connected pipe 1, and the pipe axis direction position marking 11B of the joint body 11 is aligned with the pipe axial position display marking 1B of the connected pipe 1. The joint body 11 is clamped to the pipe 1 to be connected.

(2) Terminals 14A, 14 of the heating wire 13
AC power supply or DC power supply is connected to B, and the joint body 11
The heating wire 13 is energized in a state where the outer diameter resin layer of the connected pipe 1 is superposed on the inner surface resin layer, and the heat generation of the heating wire 13 melts the resin layers of both (the connected pipe 1, the joint body 11). And fuse them together.

Therefore, according to the first embodiment,
Has the effect of By aligning the markings 11A and 11B provided on the joint body 11 with the markings 1A and 1B provided on the pipe 1 to be connected, it is possible to accurately align them.

By using the pipe circumferential direction position indicating marking 11A and the pipe axis direction position indicating marking 11B provided on the saddle 10, the take-out position of the branch pipe 12 of the saddle 10 is set in the pipe circumferential direction of the connected pipe 1 and the pipe axis. The direction can be accurately determined.

The pipe circumferential direction position marking 11A provided on the joint body 11 is, as shown in FIG. 1C, a branch pipe 12 (terminal 14 in the bending direction of the joint body 11).
(A, 14B) Corresponding positions may be set to 0 degree, and angular positions in the pipe circumferential direction may be displayed such as 15 ° and 30 ° on both sides in the pipe circumferential direction. According to this, the branch pipe 12 of the saddle 10
Can be taken out by being accurately displaced by 15 ° or 30 ° with respect to the pipe circumferential position display marking 1A of the connected pipe 1.

(Second Embodiment) (FIG. 2) The electrofusion cheese 20 is provided with a branch pipe 22 in a joint main body 21 fitted to the outer diameters of the pipes 1 and 2 to be connected. And cheese 2
0 is a resin layer such as polyethylene for the whole including the inner surface of the joint body 21, and the heating wire 23 is applied to this resin layer.
(Not shown) is buried. The heating wire 23 is continuously embedded in the left and right fitting portions for the pipes 1 and 2 to be connected, and the terminals 24 are connected to both ends of the heating wire 23.
A and 24B are provided at both ends of the joint body 21 at positions corresponding to the branch pipes 22.

The cheese 20 has pipe circumferential position indication markings 21A and 21A for displaying the relative positions of the pipe circumferential direction position markings 1A and 2A provided on the pipes 1 and 2 to be connected.
It is provided on each side of the branch pipe 12. The pipe circumferential position display marking 21A indicates that the position corresponding to the branch pipe 22 (terminals 24A, 24B) in the circumferential direction of the joint body 21 is 0.
The angular positions in the circumferential direction of the pipe are displayed as 15 ° and 30 ° on both sides in the circumferential direction of the pipe. This allows
The branch pipe 22 of the cheese 20 is exactly 15 degrees or 30 with respect to the pipe circumferential direction position markings 1A and 2A of the pipes 1 and 2 to be connected.
It is possible to take it out by shifting it.

At this time, the pipes 1 and 2 to be connected are entirely made of a resin layer such as polyethylene including the outer diameter surface.

The procedure for joining the cheese 20 will be described below. (1) Align the pipe circumferential direction position markings 21A and 21A on both sides of the joint body 21 with the pipe circumferential direction position markings 1A and 2A of the connected pipes 1 and 2, respectively, and align the joint body 21. Clamp on the connecting pipes 1 and 2.

(2) Terminals 24A, 24 of the heating wire 23
AC power supply or DC power supply is connected to B, and the joint body 21
The heating wire 23 is energized with the outer diameter resin layers of the pipes 1 and 2 to be overlapped on the inner surface resin layer, and the heat generated by the heating wire 23 causes the two (the pipe to be connected 1 and the joint body 21) to be Tube 2,
The resin layers of the joint body 21) are melted and fused together.

Therefore, according to the second embodiment,
Has the effect of By aligning the marking 21A provided on the joint main body 21 with the markings 1A and 2A provided on the connected pipes 1 and 2, the positions of the two can be accurately aligned.

By using the pipe circumferential direction position marking 21A provided on the cheese 20, the take-out position of the branch pipe 22 of the cheese 20 can be accurately determined in the pipe circumferential direction of the connected pipes 1, 2.

(Third Embodiment) (FIG. 3) The electric fusion-welding elbow 30 is provided with a joint body 31 fitted to the outer diameters of the pipes 1 and 2 to be connected. The elbow 30 has a resin layer made of polyethylene or the like as a whole including the inner surface of the joint body 31, and a heating wire 33 (not shown) is embedded in the resin layer. The heating wire 33 is continuously embedded in the left and right fitting portions for the pipes 1 and 2 to be connected, and includes terminals 34A and 34B connected to both ends of the heating wire 33 at both ends of the joint body 31, respectively.

The elbow 30 is provided with pipe circumferential position indication markings 31A and 31A for displaying relative positions with the pipe circumferential direction position markings 1A and 2A provided on the connected pipes 1 and 2, respectively.
It is provided at each of both ends of the joint body 31. The pipe circumferential direction position marking 31A is set such that the positions corresponding to the terminals 34A and 34B in the circumferential direction of the joint body 31 are 0 degrees.
The angular positions in the pipe circumferential direction are displayed on both sides in the pipe circumferential direction, such as 15 degrees and 30 degrees. As a result, the joint body 31 can be started up by being accurately displaced by 15 degrees or 30 degrees with respect to the pipe circumferential direction position display marking 1A of the connected pipe 1.

The procedure for joining the elbow 30 will be described below. (1) The pipe circumferential direction position indicating marking 31A inside the joint body 31 is marked so that the joint body 31 is set in a predetermined rising direction with respect to the connected pipe 1. 1A, and the joint body 31 is clamped to the connected pipe 1. Then, the pipe circumferential direction position indicating marking 31A on the other side of the joint main body 31 is matched with the pipe circumferential direction position indicating marking 2A of the connected pipe 2, and the joint main body 31 is clamped to the connected pipe 2.

(2) Terminals 34A, 34 of the heating wire 33
Connect AC power supply or DC power supply to B,
The heating wire 33 is energized with the outer diameter resin layers of the pipes 1 and 2 to be overlapped on the inner surface resin layer, and the heat generated by the heating wire 33 causes the two (the pipe to be connected 1 and the joint body 31) to be Tube 2,
The resin layers of the joint body 31) are melted and fused together.

Therefore, according to the third embodiment, there are the following effects. By aligning the marking 31A provided on the joint body 31 with the markings 1A and 2A provided on the connected pipes 1 and 2, the positions of the two can be accurately aligned.

By using the pipe circumferential direction position marking 31A provided on the elbow 30, it is possible to accurately determine the rising direction of the connected pipes 1 and 2 connected by the elbow 30.

[0034]

As described above, according to the present invention, in the electric fusion joint, the positioning with respect to the pipe to be connected can be accurately performed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment in which the present invention is applied to a saddle.

FIG. 2 is a schematic diagram showing a second embodiment in which the present invention is applied to cheese.

FIG. 3 is a schematic view showing a third embodiment in which the present invention is applied to an elbow.

[Explanation of symbols]

 1, 2 Pipes to be connected 1A, 2A Pipe circumferential direction position marking 1B Pipe axis direction position marking 10 Electric fusion saddle 11, 21, 31 Joint body 11A, 21A, 31A Pipe circumferential position position marking 11B Pipe axial position Display markings 13, 23, 33 Electric heating wire 20 Electric fusion cheese 30 Electric fusion elbow

Claims (1)

[Claims] 1. An electric fusion joint in which a heating wire is built in a joint body, the joint body is aligned with a pipe to be connected, and the joint body and the pipe to be joined are electrically fused and joined to each other. An electric fusion splicing joint, characterized in that a marking for indicating a relative position to the marking provided on the pipe to be connected is provided.