JPH0529540B2 - - Google Patents

Abstract

PURPOSE:To connect simply, without using any special member and inexpensively the same or different kinds of plastic pipes by applying an electric voltage to an electric resistant heating element of a melt-connecting material and melting thereby a molding. CONSTITUTION:A perforated disc-shaped melt-connecting material 1 is constituted of a molten molding 1a consisting of a high density polyethylene resin and a meandering nichrome wire 1b set therein. A ring-shaped melt-connecting material 2 is constituted of a molten molding 2a consisting of a high density polyethylene resin and a nichrome wire 2b. A connecting hole 3a for connecting a PE branch pipe 4 is opened on a PE main pipe 3. The melt-connecting material 1 is placed on the PE main pipe 3 in such a way that the circular hole 1d of the melt-connecting material 1 coincides with the connecting hole 3a and in addition, a flange 5 is placed in such a way that the circular hole 5a coincides with the connecting hole 3a. A melt- connecting body 2 is placed on the edge part of the circular hole 5a of the flange 5 and the PE branch pipe is inserted. An electric voltage is applied to each of terminals 1c, 1c, 2c and 2c of the melt-connecting materials 1 and 2 to melt each molding 1a and 2a and connect the flange 5 with the PE main pipe 3 and the flange 5 with the PE branch pipe 4 by melting.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a melt-connecting material for connecting plastic pipe bodies used in underground drainage pipes, manholes, various ducts, etc., and a method for melt-connecting the same.

(b) Conventional technology Conventionally, the following two methods have been used to connect polyvinyl chloride pipes (PVC pipes), which are widely used as underground drainage pipes. That is, one of them is an adhesive bonding method in which the PVC pipes are pretreated at the points where they are to be connected, and then an adhesive is applied and bonded together, followed by curing by applying pressure or pressure and heat. The other method is fusion joining (welding), which involves heating the joining surfaces of PVC pipes to melting temperature and joining them directly or by melting them with a hot air blower using a welding rod.
It is the law.

Furthermore, since adhesive bonding is extremely difficult to connect polyethylene pipes (PE pipes) or polypropylene pipes (PP pipes), which are conventionally widely used as underground drainage pipes, the welding method described above cannot be used. was.

(c) Problems to be Solved by the Invention When the above welding method is used, if the pipe diameter is large enough that a person can enter and work inside the pipe, two pipes of the same type can be fused together internally and externally. It is possible to do so.

However, the pipe diameter is small (less than about 1 m).
When it is not possible for a person to enter the pipe and work on it, two pipes of the same type can be welded on the outside, but not on the inside. For this reason, there have been problems in that the strength of the fused joint is insufficient or water leaks from the fused joint.

In order to solve these problems, attempts have been made to use seals with gaskets, O-rings, and other sealing materials, but the connection process is time-consuming and requires a lot of money. There was a problem.

Furthermore, conventionally, when connecting different types of plastic pipes, for example, when connecting PVC pipes and PE pipes, both adhesive bonding and welding are extremely difficult. Therefore, a construction method was adopted in which a sealing material such as a gasket or an O-ring was applied, and a fastening band was wrapped around the outside to tighten it. For this reason, there were problems in that the connection work was time-consuming, and many members and costs were required for the connection.

This invention has been made in view of the above-mentioned circumstances, and it is possible to easily and inexpensively connect plastic tube bodies of the same or different types without using special members, and it is possible to connect plastic pipe bodies of the same type or different types easily and inexpensively without using special members. Or, there is no risk of water leaking from the connection.
It is an object of the present invention to provide a melt splicing material for plastic pipe bodies and a melt splicing method thereof.

(d) Means for solving the problem and its effect The fusion splicing material for plastic pipe bodies of the present invention has the following features:
A molded body to be melted made of thermoplastic plastic and molded into an annular shape corresponding to the connecting portion of the plastic pipe body, and a molded body that is preliminarily arranged in a meandering shape along the annular portion inside this molded body. A connecting material consisting of an electrical resistance heating element connected to the outside and a terminal exposed to the outside of the molded body for applying two voltages to the electrical resistance heating element to melt the molded body. .

The elements of the molded body are preferably made of plastic of the same quality as the tube to be connected. For example PE
Polyethylene resin is preferably used to connect the pipes.

More specifically, polyolefin resins such as high-density polyethylene, low-density polyethylene, and polypropylene, ethylene-vinyl acetate copolymer resin (EVA), and ethylene-acrylic acid alkyl ester copolymer resin (typically EEA, that is, 5% ethyl ester) These include olefin copolymer resins such as those listed above, acrylic resins containing esters of acrylic acid and methacrylic acid, various vinyl resins such as polyvinyl chloride resins and polystyrene resins, and condensation resins such as polyester and polyamide. , may be used alone or as a mixture depending on the purpose.

For example, high-density polyethylene and polypropylene are used for hard fusion splicing materials, and when elasticity and flexibility are required, vinyl acetate synthetic resins such as EVA and a mixture of EVA and polyethylene, acrylic synthetic resins such as EEA, and low Density polyethylene or the like is preferably used. As described above, polyolefin resins and mixtures of olefin copolymer resins and polyolefin resins are typical synthetic resin materials often used in the present invention.

The shape of the molded body includes annular shapes such as a ring shape and a cylindrical shape. As the electric resistance heating element, a wire-shaped one is used by being previously arranged (inserted) inside the molded body in a meandering manner along the ring part. As the linear electric resistance heating element, a nichrome wire or an iron-chrome wire is preferably used.

The method for fusion-connecting plastic tube bodies of the present invention is a method for fusion-connecting two tube bodies made of the same type of thermoplastic plastic, and includes interposing the above-mentioned fusion splicing material at the portions of the tube bodies to be connected. This is a method that involves applying a voltage to an electric resistance heating element through the terminal after adhering, thereby melting the molded body of the fusion connecting material to connect the two tube bodies, and then removing only the terminal. .

The two tubes are connected in a straight line or at an angle to each other. Here, when the above-mentioned fusion splicing material is interposed at the location to be connected, it is preferable to use a pressurizing operation such as tightening the pipe body with a vise to make the fusion connection more reliable.

Furthermore, the following methods are available for applying the above-mentioned fusion connecting material to the portions of the tube to be connected. In other words, a ring-shaped fusion splicing material is placed or glued in advance at the point to be connected, and then electricity is applied from the terminal, or in addition to that, a linear fusion splicing material is placed close to the point to be connected. There is a configuration in which the molten connecting material is gradually moved along the weld line while the terminal is held in place and current is applied from the terminal.

For these fusion splicing operations, if there is an indoor power source, it is sufficient to use that power source, but for on-site work in locations without power sources, such as outdoors or in the mountains, a portable generator or storage battery may be used. .

Thus, according to this fusion splicing material and fusion splicing method, it is possible to reliably weld not only the outside but also the inside of the portion where two pipe bodies are to be connected.

(E) Embodiments The present invention will be described in detail below based on four embodiments shown in the drawings. Note that this invention is not limited to these.

Example 1 In FIGS. 1 to 6, numeral 1 represents a perforated disc-shaped fusion splicing material. This melt-connecting material 1 consists of a perforated disk-shaped molded body 1a made of high-density polyethylene resin, and a nichrome wire as an electrical resistance heating element arranged in a meandering manner inside this molded body 1a. 1b. Terminals 1c, 1c are connected to each end of the nichrome wire 1b, and these are exposed to the outside of the molded body 1a. terminal 1
1c and 1c are for applying a voltage to the nichrome wire 1b to melt the molded body 1a.

Reference numeral 2 denotes a ring-shaped melting connection material, which includes a ring-shaped molded body 2a to be melted made of high-density polyethylene resin, and a nichrome wire as an electric resistance heating element disposed inside this molded body 2a. 2b. Terminals 2c, 2c for melting the molded body are connected to each end of the nichrome wire 2b, and these terminals are exposed to the outside of the molded body 2a.

3 is a circular main pipe (PE main pipe) made of high-density polyethylene resin. 4 is a circular main pipe (PE branch pipe) also made of high-density polyethylene resin.
It is.

Hereinafter, a method for orthogonally fusion-connecting the PE branch pipe 4 to the PE main pipe 3 will be explained.

A molten splicing material 1 having a predetermined shape and size is prepared in advance. That is, molten connecting material 1
A pipe having a circular hole 1d with a diameter slightly larger than the outer diameter of the PE branch pipe 4 and curved so as to follow the outer surface of the PE main pipe 3 is prepared. In addition,
When EVA or the like is used as the fusion connecting material 1, there is no need to curve it along the outer surface of the PE main pipe 3 because the material is flexible.

Further, a disk-shaped flange body 5 having a circular hole 5a with a diameter slightly larger than the outer diameter of the PE branch pipe 4 and curved to follow the outer surface of the PE main pipe 3 is prepared.

First, a connecting hole 3a for connecting the PE branch pipe 4 to the PE main pipe 3 is made using a drilling machine. Then, the molten connecting material 1 is placed on the PE main pipe 3 so that its circular hole 1d matches the connecting hole 3a, and on top of that,
The flange body 5 is placed so that its circular hole 5a coincides with the connection hole 3a. Next, the fusion connector 2 is placed on the edge of the circular hole 5a of the flange body 5,
Insert the PE branch pipe 4 as shown in FIG.

Thereafter, by applying a voltage from each terminal 1c, 1c, 2c, 2c of the melting connecting material 1 and the melting connecting material 2, the molded bodies 1a, 2a are melted. At this time, a fastening band (not shown) is wound and tightened from the PE main pipe 3 to the flange body 5.

Each molded body 1a, 2a is melted and a flange body 5 is formed.
After the PE main pipe 3, flange body 5, and PE branch pipe 4 are fused and connected, the nichrome wires 1b and 2b are cut off as much as possible. At this time, each terminal 1c, 1c, 2c, 2
c is also removed. In addition, if the fastening band is removed after the fused joint has cooled and completely hardened,
Deformation due to strain is prevented and the connection is strengthened.

Note that the PE branch pipe 4 and the flange body 5 may be integrated in advance by fillet welding or the like, without using the fusion connection body 2 as described above. Further, the PE pipe 4 may have a flange portion provided at its end by flanging.

Example 2 FIGS. 7 to 10 show Example 2. 6 is a rod-shaped melting connection material, which is a molded object 6 to be melted made of high-density polyethylene resin.
a, an iron-chrome wire 6b as an electrical resistance heating element disposed in a hairpin shape inside the molded body 6a, and terminals 6c attached to both ends of the iron-chrome wire 6b;
It consists of 6c.

Reference numeral 7 denotes a cylindrical melting connection material, including a molded body 7a to be melted made of polyvinyl chloride resin, an iron chromium wire 7b as an electric resistance heating element arranged in a meandering manner inside the molded body 7a, and iron chrome wire 7b
It consists of terminals 7c, 7c attached to both ends of the.

8 is a circular main pipe (PE main pipe) made of high-density polyethylene resin, 9 is a circular branch pipe (PE branch pipe) also made of high-density polyethylene resin, and 10 is a circular pipe made of polyvinyl chloride resin. Branch pipe (PVC
branch pipe). Further, 11 is a cylindrical joint (PVC joint) made of polyvinyl chloride resin. Two parallel protrusions 11a, 11a are formed on the outer surface of this PVC joint 11, and two U grooves 11b, corresponding to each protrusion 11a, 11a, are formed on the inner surface.
11b is formed.

Hereinafter, a method of melt-connecting the PVC branch pipe 10 to the PE main pipe 8 in an oblique manner will be explained.

In advance, a melt connecting material 7 molded into a shape and size that can be fitted over the PVC branch pipe 10 is prepared. Then, a connecting hole 8a for connecting the PE branch pipe 9 in an oblique manner to the PE main pipe 8 is bored using a punching machine. Thereafter, a diagonally cut PE branch pipe 9 is fitted into this connection hole 8a and temporarily fixed. Next, hold the molten connecting material 6 close to the location to be connected, and connect the terminals 6c, 6.
At the same time as electricity is supplied from c, the molten connecting material 6 is connected to the connecting hole 8.
Gradually move it along the edge (welding line) of a. Then, the molded body 6a of the molten connecting material 6 is melted and the first
A welded portion 12 as shown in FIG. 0 is formed.

Note that the PE main pipe 8 and the PE branch pipe 9 may be integrated in advance by a conventional welding method without using the above-mentioned fusion connecting material 6.

After connecting the PE main pipe 8 and the PE branch pipe 9, attach the U groove 1 on the lower side of the PVC joint 11 to the upper end of the PE branch pipe 9.
The lower half of the PVC joint 11 is fitted over the special rubber gasket 13 fitted into the fitting 1b. Next, the lower end of the PVC branch pipe 10 to be connected is covered with the melted connecting material 7, and these are fitted into the upper half of the PVC branch pipe 10. At this time, both terminals 7c, 7c of the fusion connecting material 7 are exposed upward from the PVC branch pipe 10 (FIG. 9).

Thereafter, by applying a predetermined voltage of the iron-chromium wire 7b through both terminals 7c, 7c of the melting connection material 7, the molded body 7a of the melting connection material 7 is melted.
Then, the PVC branch pipe 10 and the PVC joint 11 are
They are connected by forming a welded part 14 as shown in FIG.

In this way, the PE main pipe 8 and the PVC branch pipe 10 are melt-connected in a diagonal manner.

Embodiment 3 In FIG. 11, reference numeral 16 denotes a joint box, which has four projecting tube portions 16a, 16a, 16a, 16a forming an angle of 90 degrees with each other. The tip of each protruding tube portion 16a is covered with a blind lid 16b, 16b, 16b, 16b.

In Fig. 12, 17 is a pipe socket;
This is the socket part 17a to which the pipe is connected.
and a fitting portion 17 that fits into the protruding tube portion 16a of the cut joint box 16 of the blind lid 16b.
It is composed of b.

FIG. 13 shows a state in which three pipe sockets 17, 17, 17 are connected to the joint box 16 in a T-shape. That is, joint box 16
The blind lids 16b, 16b, 16b are cut out at three locations to provide openings. After that, three protruding pipe parts 16
A ring-shaped fusion connector (such as the one shown in FIG. 2) is wound around the outer surface of each of the tips of a, 16a, and 16a. Then, in the same manner as in the three embodiments described above, the three pipe sockets 17, 17, 17 were connected to the joint box 16 by melting the molded body of the fusion joint.

(F) Effects of the Invention The fusion splicing material for plastic tubes of the present invention is constructed as described above. Further, the melting splicing material for plastic tubes of the present invention is produced by the method described above.

Therefore, by applying a voltage to the electrical resistance heating element of the melting splicing material and melting the molded body, plastic tubes of the same or different types can be easily and inexpensively connected without using special members. . Further, there is no possibility that the strength of the connection part will be insufficient or that water will leak from the connection part. Furthermore, the welding rod and hot air blower that were conventionally required are no longer necessary. In addition, fusion splicing work can be easily performed even in locations where there is no power supply.

[Brief explanation of the drawing]

Embodiment 1 of the present invention is shown in FIGS. 1 to 6. That is, FIG. 1 is a perspective view of a disc-shaped fusion connection, FIG. 2 is a perspective view of a ring fusion connection, and FIG. 3 is a perspective view of a ring fusion connection.
The figure is a vertical cross-sectional view showing the state of fusion connection between the PE main pipe and the PE branch pipe, Figure 4 is a vertical cross-sectional view in that state, Figure 5 is an enlarged vertical vertical cross-sectional view of the main part in that state, FIG. 6 is a sectional view taken along the line - in FIG. 5. 7 to 10 show a second embodiment of the present invention. That is, FIG. 7 is a perspective view of a rod-shaped fusion connection, FIG. 8 is a perspective view of a cylindrical fusion connection, FIG. 9 is a front view showing the state before connection of a PE main pipe and a PVC branch pipe, and FIG. Figure 10 is an enlarged vertical cross-sectional view of the main part showing the state after connection of the PE main pipe and the PVC branch pipe. Embodiment 3 of the present invention is shown in FIGS. 11 to 13. That is, FIG. 11 is a perspective view of the joint box, FIG. 12 is a perspective view of the pipe receptacle, and FIG. 13 is a perspective view showing the state in which the pipe receptacle is fused and connected to the joint box. 1, 2... Melting connection material, 1a, 2a... Molded body, 1b, 2b... Nichrome wire (electrical resistance heating element), 1c, 2c... Terminal, 3, 8... PE main pipe,
4, 9... PE branch pipe, 6, 7... Melt connecting material, 6
a, 7a... Molded body, 6b, 7b... Iron chrome wire (electrical resistance heating element), 6c, 7c... Terminal, 10...
...PVC branch pipe, 11...PVC joint, 13...gasket, 16...joint box, 17...
...Pipe socket.

Claims (1)

[Scope of Claims] 1. A molded body to be melted, which is a melt-connecting material for two plastic tube bodies, and is made of thermoplastic plastic and is formed into an annular shape corresponding to the connecting portion of the plastic tube bodies; An electric resistance heating element is arranged in advance inside the molded body in a meandering manner along the ring part, and an electric resistance heating element is placed exposed outside the molded body, and a voltage is applied to the electric resistance heating element to generate the molded body. A melting connecting material for plastic tubes consisting of a terminal for melting. 2. A method for fusion-connecting two tubes made of the same type of thermoplastic plastic, wherein the fusion-connecting material according to claim 1 is interposed or adhered to a portion of the tubes to be connected, and then the terminal thereof is A method for melting and connecting plastic tubes, which involves applying a voltage to an electric resistance heating element through the tube to melt a molded body of melting splicing material to connect two tubes, and then removing only the terminals.