JPH0979470A - Electric fusion branch pipe coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the working time in a piping work by providing an electric fusion socket integrally to a branch pipe side. SOLUTION: In a thermoplastic resin electric fusion saddle coupling (EF saddle coupling), for example, electric heating bodies 12 and 15 are housed at the inner side of a saddle 11 and a branch 13 respectively. When a branch pipe is picked out from a main pipe by using the EF saddle coupling, at first the EF saddle coupling is loaded on the main pipe whose surface is scraped, a power is fed to the electric heating body 12 at the saddle side from a terminal pin 14 so as to heat it, and the main pipe and the EF saddle coupling are thermal fused. Then, after a drill is inserted in the branch 13 to bore a hole to the main pipe, the drill is pulled out, the branch pipe whose surface is scraped is inserted to the branch 13, the power is fed to the terminal pin 14 at the branch 13 side of the EF saddle coupling, so as to heat the electric heating body 15, and the branch pipe is thermal fused to the branch 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrofusion branch pipe joint.

[0002]

2. Description of the Related Art An electric fusion saddle joint made of a thermoplastic resin and an electric fusion service tee are generally used as joints used for joining a branch pipe from a main pipe of polyethylene, polypropylene or the like. As shown in FIGS. 1 and 2, the electric fusion saddle joint is composed of a saddle portion 1 and a branch portion 3, and an electric heating element 2 is built in the saddle portion 1.

When the branch pipe is to be taken out using the electric fusion saddle joint, the electric fusion saddle joint is placed on the main pipe (not shown) and the heating element 2 is energized to generate heat and fused to the main pipe. After fixing, a hole is drilled from the side of the branch portion 3. Next, as shown in FIG. 3, an electric fusion-bonding socket C having 3 at a branch portion and an electric heating element at a receiving port and fixed by a clamp D.
Connect. Furthermore, after inserting the branch pipe b into the other receptacle of the electric fusion socket C, energizing the electric heating element from the controller E and connecting the branch pipe b to the receptacle, the branch can be taken from the main pipe. .

The above-mentioned plumbing work is often performed in a narrow excavation, and the contents of the work include the pipe surface scraper hooking on the electrofusion saddle joint fusion surface of the main pipe, clamp fixing and fusion welding of the electrofusion saddle joint. , Drilling, cutting to the required length of branch pipe, scraper hooking of fusion surface of branch pipe, electric fusion saddle joint, cleaning of fusion surface of branch pipe, electric fusion saddle joint, clamp fixing of branch pipe, fusion It is classified as clothes.

The above-mentioned piping work is performed from a 150 mm main pipe to 5
The following is a description of the actual work contents and the time required for removing a 0 mm branch pipe. (B) Hooking the saddle fusion surface of the main pipe on the pipe surface scraper ・ ・ ・ 2 minutes (b) Clamping and fusion of the electric fusion saddle joint ・ ・ ・ 3 minutes (c) Cooling ・ ・ ・・ ・ 3 minutes (d) Drilling and removal of clamp ・ ・ ・ ・ ・ ・ 1.5 minutes (e) Cutting of branch pipe to required length ・ ・ ・ ・ 1 minute (f) Fusion surface of branch pipe Scraper hanging on the wire ・ ・ ・ ・ 1 minute (g) Scraper hanging on the branch part of the electric fusion saddle joint ・ ・ ・ ・ ・ ・ 1 minute (h) Cleaning of the fusion surface of the electric fusion saddle joint ・ ・ ・ ・・ ・ 0.6 minutes (re) Electric fusion saddle joint, clamp and fixing of pipe, fusion ・ ・ ・ ・ 4 minutes (n) Cooling, unclamping ・ ・ ・ ・ ・ ・ 3 minutes A series of work steps It takes about 20 years to complete the plumbing work.
Takes minutes.

In the above-mentioned plumbing work, the scraper hooking of the main pipe fusion surface and the saddle joint fusion surface is a work of peeling the skin with a dedicated tool, which is an essential work for increasing the fusion force between the main pipe and the saddle joint. Is. Moreover, since the skin cannot be peeled off without fixing the scraper to a certain extent, the electric fusion saddle joint is clamped to the dummy pipe outside the excavation groove, and the electric fusion saddle is held in this state. Although there were times when a scraper was hung on the branch part of the joint, the dummy tube was rarely used because it required preparation of a dummy tube, tightening with a clamp to fix it to the dummy tube, and removal. Not not.

Therefore, the outer surface scraper of the branch portion of the electric fusion saddle joint is hooked after the electric fusion saddle joint is fused to the main pipe. However, the actual scraper hanging is a troublesome work because it is carried out in a narrow excavation groove, and there is a problem that the connection strength is adversely affected when uniform peeling cannot be performed by rough work.

As shown in FIG. 4, the electric fusion service station comprises a saddle portion 1, a branch portion 3 and a drill insertion portion 6, and the saddle portion 1 contains an electric heating element. The drill insertion portion 6 is provided to insert a drill to make a hole in the main pipe, and has a cap (not shown) fitted therein when not in use.

When a branch pipe is to be taken out using the electric fusion service tee described above, the electric fusion service tee is placed on the main pipe (not shown), the heating element is energized to generate heat, and fusion fixing is performed on the main pipe. After that, a hole is drilled from the drill insertion portion 6.
Next, the branch portion 3 is connected to the electric fusion socket 5. Further, by connecting a branch pipe (not shown) to the other receptacle of the electric fusion socket 5, the main pipe can be branched.

Even when the above electric fusion service tee is used, it is necessary to apply a scraper to the surface of the main pipe and the branch portion, and like the case of the electric fusion saddle joint branch portion, if uniform peeling cannot be performed, There is a problem that the connection strength is adversely affected.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to eliminate the need for a scraper work at a branch portion when branching from a main pipe and to eliminate the problem of the conventional piping. An object of the present invention is to provide an electric fusion branch pipe joint capable of shortening work time as compared with construction work.

[0012]

The electric fusion branch pipe joint of the present invention is a thermoplastic resin electric fusion saddle joint or a thermoplastic resin electric fusion saddle joint in which an electric fusion heater is built in a contact portion with a pipe body. The fusion service station is characterized in that an electric fusion receiving port is integrally provided on the branch pipe side.

The thermoplastic resin used in the present invention is not particularly limited, but examples thereof include polyolefins such as polyethylene and polypropylene.

The electrofusion branch pipe joint of the present invention will be described with reference to the drawings in the case of an electrofusion saddle joint made of thermoplastic resin (hereinafter referred to as EF saddle joint). FIG. 5 is a cross-sectional view (direction perpendicular to the pipe axis) showing the thermoplastic resin EF saddle joint, and FIG. 6 is a side view of the EF saddle joint. In the figure, 11 indicates a saddle portion and 13 indicates a branch portion. Electric heating elements 12 and 15 are incorporated inside the saddle portion 11 and the branch portion 13, respectively. As the electric heating elements 12 and 15, for example, nichrome wire is used, and the ends of the nichrome wire are connected to the terminal pins 14 exposed to the outside, respectively.

The method for manufacturing the EF saddle joint is not particularly limited, and the saddle portion 11 and the branch portion 13 are formed by injection molding.
May be integrally molded, or the saddle part 11 and the branch part 13 may be separately molded and then joined together. Examples of the method of joining the saddle portion 11 and the branch portion 13 include commonly used methods such as the butt fusion method shown in FIG. 7 and the sleeve fusion method shown in FIG.

When the branch pipe is taken from the main pipe by using the EF saddle joint, first, the EF saddle joint is placed on the main pipe (not shown) whose surface is scraped, and the saddle side from the terminal pin 14 is placed. The electric heating element 12 is energized to generate heat, the main pipe and the EF saddle joint are melted, and the EF saddle joint is heat-sealed onto the main pipe.

Then, a drill is inserted into the branch portion 13 to perforate the main pipe, the drill is removed, and a branch pipe (not shown) whose surface is scraped is inserted into the branch portion 13, and EF is inserted.
The terminal pin 14 on the side of the branch portion 13 of the saddle joint is energized to generate heat in the electric heating element 15, and the branch pipe is heat-sealed to the branch portion 13.

The positions of the terminal pins 14 on the side of the branch portion 13 are arranged side by side in the vertical direction in FIGS. 5 and 6, but they may be arranged so as to be horizontal on the circumference.

In order to shorten the working time, the fusion of the EF saddle joint and the main pipe and the fusion of the branch portion and the branch pipe may be performed at the same time. As a clamp used at that time, for example, , And those shown in FIGS. 9 and 10.

As a method of using the above clamp, one flange plate J of the above clamp is fixed to one flange part of the EF saddle joint A, and the other flange plate K is used as a saddle clamp G. Then, the clamp is attached to the main pipe by fixing it to the other flange portion. By fixing the branch pipe b by the socket clamp I attached to the support rod M extending from the saddle clamp, the EF saddle joint A and the main pipe B are fused and the branch portion N and the branch pipe b are fused. It is possible to wear and wear at the same time.

The electric fusion branch pipe joint of the present invention will be described with reference to the drawings in the case of an electric fusion service tee made of a thermoplastic resin (hereinafter referred to as EF service tee).
FIG. 11 is a front surface (direction perpendicular to the tube axis) showing the thermoplastic resin EF service die. In the figure, 11 is a saddle part,
Reference numeral 13 denotes a branch portion, and 16 denotes a drill insertion portion.
An electric heating element (not shown) is built inside the receiving portions of the saddle portion 11 and the branch portion 13. As the electric heating element, for example, a nichrome wire is used, and the ends of the nichrome wire are connected to the terminal pins 14 exposed to the outside, respectively.

The method for manufacturing the EF service station is not particularly limited, and the saddle part 11 and the branch part 1 are formed by injection molding.
3 and the drill insertion portion 16 may be integrally formed, or the saddle portion 11 and the branch portion 13 may be separately formed and then joined together. Examples of a method for joining the saddle portion 11 and the branch portion 13 include commonly used methods such as a butt fusion method and a sleeve fusion method.

When the branch pipe is taken from the main pipe by using the EF service che, the EF service che is first placed on the main pipe (not shown) whose surface is scraped, and saddle from the terminal pin 14. The electric heating element 12 on the side is energized to generate heat in the electric heating element 12, the main pipe and the EF service chee are melted, and the EF saddle joint is heat-sealed onto the main pipe.

Next, a branch pipe (not shown) in which a drill is inserted into the drill insertion portion 16 to perforate the main pipe, and then the drill is removed, and the surface of the branch portion 13 is scraped with a scraper
Is inserted, the terminal pin 14 on the side of the branch portion 13 is energized to heat an electric heating element (not shown), and a branch pipe (not shown) is heat-sealed to the branch portion 13.

(Operation) The electrofusion branch pipe joint of the present invention is
By integrally providing the electric fusion receiving port on the side of the branch pipe, the scraper work on the side of the branch pipe is unnecessary as compared with the conventional method, and thus the work time for taking the branch pipe from the main pipe can be shortened. .

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

(Embodiment 1) When the EF saddle joint shown in FIG. 1 is used to take out a branch pipe of 50 mm from a main pipe of 150 mm, the actual work contents and the time required therefor are as follows. Become. (A) Hooking the saddle fusion surface of the main pipe on the pipe surface scraper: 2 minutes (b) Clamping and fusion of the EF saddle joint: 3 minutes (c) Cooling: 3 minutes (d) Drilling and unclamping ... 1.5 minutes (e) Cutting the required length of the branch pipe ... 1 minute (f) To the fused surface of the branch pipe Scraper hanging ・ ・ ・ ・ 1 minute (g) Cleaning of fusion surface of EF saddle joint ・ ・ ・ ・ ・ ・ 0.3 minute (h) EF saddle joint, pipe clamp, fusion・ 3 minutes (Re) Cooling, unclamping ・ ・ ・ 3 minutes 17.8 to complete the piping work by the above work process.
It took a minute, and a time reduction of about 2 minutes was achieved as compared with the conventional method.

(Embodiment 2) When the EF saddle joint shown in FIG. 1 is used to take out a branch pipe of 50 mm from a main pipe of 150 mm, the actual work contents and the time required therefor are as follows. Become. (B) Hooking the pipe surface scraper on the saddle fusion surface of the main pipe ... 2 minutes (b) Clamping the EF saddle joint ... 0.5 minutes (c) Drilling 1 min (d) Cutting of the branch pipe to the required length ・ ・ ・ ・ ・ 1 min (v) Scraper hooking on the fusion surface of the branch pipe ・ ・ ・ ・ ・ 1 min (f) EF saddle joint fusion Cleaning of attachment surface: 0.3 minutes (g) Clamping of branch pipes: 0.5 minutes (h) Electric fusion Saddle joint and branch pipe fusion, cooling --- 5.5 minutes (Re) Unclamping --- 0.5 minutes To complete the piping work by the above work steps, 12.3
It took a minute, and a time reduction of about 8 minutes or more was achieved as compared with the conventional method. The electric fusion saddle joint and the branch pipe were fused in parallel at the same time.

[0029]

The electric fusion splicing pipe joint of the present invention has the above-mentioned constitution, and when the branch is taken out from the main pipe, the branch portion receiving port has the electric heating element, and the scraper work is unnecessary. Therefore, the work time required for the plumbing work can be significantly reduced compared to the conventional method.

[Brief description of drawings]

FIG. 1 is a front view showing a conventional electric fusion saddle joint.

2 is a side view of the electric fusion saddle joint of FIG. 1. FIG.

3 is a perspective view showing a piping method when a branch pipe is taken out using the electric fusion saddle joint of FIG. 1. FIG.

FIG. 4 is a front view showing a conventional electric fusion service station.

FIG. 5 is a front view showing an example of the electric fusion saddle joint of the present invention.

FIG. 6 is a side view of the electric fusion saddle joint of FIG.

FIG. 7 is a front view showing another example of the electric fusion saddle joint of the present invention.

FIG. 8 is a front view showing still another example of the electric fusion saddle joint of the present invention.

FIG. 9 is a perspective view showing a main pipe and an electric fusion saddle joint fixed by a clamp.

FIG. 10 is a side view showing a clamp.

FIG. 11 is a front view showing an example of the electric fusion service cheese of the present invention.

[Explanation of symbols]

 1,11 Saddle 2,12 Electric heating element 3,13 Branch part 4,14 Terminal pin 15 Electric heating element 5 Electric fusion socket 6,16 Drill insertion part A Electric fusion saddle joint further B Main pipe b Branch pipe C Electric Fusion Socket D Clamp E Controller G Sadori Clamp H Saddle Knob I Socket Clamp J Flange Plate K Holding Part L Socket Knob M Support Rod N Branch

Claims (1)

[Claims] 1. A thermoplastic resin electric fusion saddle joint having a built-in electric fusion heater at a contact portion with a pipe body or a thermoplastic resin electric fusion service tee, wherein an electric fusion receiving port is provided on a branch pipe side. An electric fusion branch pipe joint characterized by being integrally provided.