JPH05340494A - Plastic pipe coupling and connection method - Google Patents

Abstract

PURPOSE:To provide a plastic pipe coupling which eliminates a need for recovery of a tool even after a fusing work is completed and embedded in a state to fix a pipe by fixing an adhesive tape, having specified cohesion through which the adhesive tape is adhered on the outer surface of a resin pipe, on the outer surface of the connection end part of a coupling body. CONSTITUTION:Adhesion tapes 2 and 2 are fixed in two spots and in positions situated peripherally symmetrical to each other on the outer peripheral surfaces of the connection ports 11 and 11 of a coupling body 1. The adhesive tape 2 is preferably formed such that the back of paper cloth or cloth is coated with paste and a film 21 is mounted on an adhered paste surface. In adhesion of the adhesive tape to a polyethylene pipe, the film is peeled and the tape is mounted on the outer surface of the pipe. A pressure sensitive adhesive having cohesion of 0.05kg/cm<2> or more at 100 deg.C and heat resistance by which adhesion is prevented from reduction even when temperature is increase is used for a pressure sensitive adhesive for tape since the temperature of a pipe is increased to approximate 100 deg.C during fusion connection. For example, an acryl base sensitive adhesive is preferable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to embed a heating wire in the inner surface of a joint body and heat the outer surface of a thermoplastic resin pipe such as a polyethylene pipe inserted into the joint body by the heat generated by the heating wire to heat the joint body and the resin. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fusion type plastic pipe joint for integrally fusion-bonding pipes and a connecting method therefor.

[0002]

2. Description of the Related Art In an electric fusion type pipe joint, there is a relative change in position between the joint body and the pipe after the resin pipe is inserted into the joint body until fusion connection with the pipe is completed. , The axis may be connected in a bent state, or the fusion splicing may not be performed reliably. Therefore, for example, the actual Kaihei 3-11
The resin pipe is fixed using the clamp type electric fusion fixing tool disclosed in Japanese Patent No. 2329, and the operation is continued by fixing until the connection work is completed.

[0003]

When the above-mentioned conventional clamp type electric fusion fixing tool is used, it is useful for surely fixing the resin pipe. However, the diameter of the resin pipe to be fusion-bonded and the elbow , Special tools are required for each type of joint body such as teeth. In addition, since the tool cannot be removed after the fusion splicing until the resin in the fusion part has cooled, a large number of fixed tools are required when continuously performing the splicing work, and many types of tools are prepared. I have to carry it around. Since this tool is generally made of metal and has a bulky shape, the burden on the operator is heavy and the fusion work is troublesome.

The present invention solves the above problems, and can be easily fixed without using a clamp type tool for fixing a pipe, and it is necessary to collect the tool even after the fusion work is completed. A plastic pipe joint that can be embedded without fixing the pipe and a method for connecting the plastic pipe joint.

[0005]

The gist of the present invention is to embed a heating wire in the inner surface of the joint body and heat the outer surface of the resin pipe inserted into the connection end of the joint body by the heat generated by the heating wire to heat the joint body and the resin. In the case of fusion-bonding pipes, an adhesive tape having an adhesive having a cohesive force of 0.05 Kg / cm ² or more at 100 ° C. which adheres to the outer surface of the connection end portion of the joint body at 100 ° C. The heating wire is embedded in the inner surface of the plastic pipe joint and the joint body, and the outer surface of the resin pipe inserted into the connection end of the joint body is heated by the heat generated by the heating wire to melt the joint body and the resin pipe. In the method of connecting and connecting, after inserting the resin pipe into the connecting end of the joint body,
The joint body and the surface of the resin pipe are attached and fixed with an adhesive tape having an adhesive having a cohesive force of 0.05 Kg / cm ² or more at 00 ° C, and then power is supplied to the heating wire of the joint body. It is a method for connecting a plastic pipe joint, which is characterized by performing fusion-splicing.

[0006] The adhesive tape is a tape having a glue surface on which a film is adhered, which facilitates the work. When the adhesive tape is adhered to a pipe, the film is peeled off and adhered. The adhesive tape may have a length in the axial direction and may be attached to the target position on the circumference of the joint body and the resin pipe, or it may be wrapped around the circumference of the joint body and the resin pipe. You can Further, the adhesive tape preferably has a heat-resistant adhesive because the temperature of the joint increases at the time of connection, and for example, an acrylic adhesive is used.

[0007]

Since the present invention has the above-mentioned constitution, the joint body is bonded to the joint body with an adhesive tape having a cohesive force of 0.05 Kg / cm ² or more at a temperature of 100 ° C. which rises during fusion splicing of the joint body and the pipe. After inserting the tube, it is fixed by sticking it to the outer surface of the tube.
For this reason, the joint body and the inserted resin pipe can be fixed so as not to move. The cohesive force is a force against the shearing force of the adhesive.
The force with which the pipe is pulled out from the joint body varies depending on various conditions during construction, so it cannot be generally stated, but there is no problem if the resin pipe has a fixed weight of 5 m. The value obtained by dividing the self-weight of the resin pipe by the area where the adhesive tape is attached is about 0.03, and the pipe can be safely fixed if there is a cohesive force of 0.05 Kg / cm ² or more. I can.

Therefore, the joint body and the pipe can be fixed easily without taking up space, and can be fixed in the same manner regardless of the pipe diameter and the type of the joint, and many conventional fixing tools are used. do not need. Further, even if the resin of the fusion-bonded portion is cooled after the connection and the connection work is completed, it is not necessary to remove the fixing of the adhesive tape fixed to the joint body, and the adhesive tape can be embedded in the state of being stuck. ..

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the plastic pipe joint of the present invention. In FIG. 1, reference numeral 1 denotes a socket-type joint main body, which has connection ports 11 and 11 at both ends for receiving a polyethylene pipe to be connected. A heating wire is embedded in the inner surface of the connection port 11, and an end portion of the heating wire is connected to terminals 12, 12 protruding to the outer surface of the joint body 1. Both terminals 12
The heating wire is heated by energizing the inner surface of the joint body to melt the inner surface of the joint body and the outer surface of the polyethylene pipe inserted into the connection port, and integrally weld and connect them.

On the outer surface of each connection port 11, 11 of the joint body 1, two adhesive tapes 2, 2 are fixed at circumferentially symmetrical positions. The adhesive tape 2 is preferably made of a paper cloth or a cloth which is tough and glued on the back of the cloth, and a film 21 is attached to the adhesive paste surface. When the adhesive tape 2 is bonded to a polyethylene pipe, it is peeled off and attached to the outer surface of the pipe. Also, the adhesive used for tape has a cohesive force of about 0.05 Kg / cm ² or more at 100 ° C because the temperature of the joint rises by about 100 ° C at the time of fusion splicing. A heat-resistant pressure-sensitive adhesive that does not decrease the heat resistance is used. For example, an acrylic adhesive is preferable.

Although the joint body 1 and the adhesive tape may be fixed mechanically, the adhesive tape 2 is attached to the outer surface of the joint body 1.
After gluing the glue surface of, fix it tightly with a hot iron. In use, after inserting a polyethylene pipe to be connected to the connection port 11 of the joint body 1, the film 21 of the adhesive tape 2 is peeled off and adhered in the axial direction of the outer surface of the pipe to fix the joint body 1 and the pipe. The adhesive tape 2 fixed to the joint body 1 may be fixed so that the joint body and the pipe can be wound in the circumferential direction and adhered as shown in FIG.

FIG. 3 shows a saddle type pipe joint which is fusion-bonded to the outer peripheral surface of a polyethylene pipe. Joint body 13 in this case
Has a heating wire embedded in the lower inner surface side, and the end of the heating wire is connected to a terminal 14 protruding to the outer surface of the joint body 13. Adhesive tapes 22 and 2 are provided on the outer surfaces of both sides of the joint body 13.
2 is fixed. In use, the joint body 13 is placed on the outer peripheral surface of the pipe, the film 21 on the adhesive surface of the adhesive tapes 22 on both sides is peeled off, and then the joint body 13 is adhered to the outer peripheral surface of the pipe. Fix the tube.

After inserting the polyethylene pipe to be connected to the connection port 11 of the joint body 1, the above-mentioned adhesive tape is wound and fixed from the outer peripheral surface of the polyethylene pipe to the outer peripheral surface of the joint body. After fixing the pipe to each connection port 11 of the joint body as described above, electric power is supplied to the heating wire of the pipe joint to heat the heating wire, and the pipe joint and the pipe are electrically fusion-bonded to each other. Since the electric fusion connection is made in a state where the adhesive tape is wound, foreign matter such as earth and sand does not adhere to the fusion connection portion.

As described above, according to the present invention, it is not necessary to use a large number of fixtures which have been required in the past, the fixture can be easily fixed to the inserted tube, and foreign matters are not mixed in the connection portion, so that the fusion bonding is possible. Good quality connection. Also, since the fitting for the pipe is provided on the pipe fitting itself, it is not bulky, it is light, and it is easy to handle, so it is not necessary to remove it after fusion splicing, and it remains in the state of adhesive fixing with the pipe Can be buried. Further, since another heavy and bulky tool unlike the conventional one is not required, the area to be excavated can be reduced. Therefore, the connection work is significantly shortened as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a perspective view of a socket type plastic pipe joint showing an embodiment of the present invention.

FIG. 2 is a perspective view of a socket type plastic pipe joint showing an embodiment of the present invention.

FIG. 3 is a perspective view of a saddle type plastic pipe joint showing an embodiment of the present invention.

[Explanation of symbols]

 1, 13 Joint body 2, 22 Adhesive tape 11 Connection port 12, 14 Terminal ───

Claims (2)

[Claims] 1. A method for embedding a heating wire in an inner surface of a joint body and heating an outer surface of a resin pipe inserted into a connection end portion of the joint body by heat generation of the heating wire to fusion-bond the joint body and the resin pipe, A plastic pipe characterized in that an adhesive tape having an adhesive having a cohesive force of 0.05 kg / cm ² or more at 100 ° C. for adhering to the outer surface of the resin tube is fixed to the outer surface of the connection end of the joint body. Fittings. 2. A method of embedding a heating wire in an inner surface of a joint body and heating an outer surface of a resin pipe inserted into a connection end portion of the joint body by heat generation of the heating wire to fusion-bond the joint body and the resin pipe, After inserting the resin pipe into the connection end of the joint body, attach the joint body and the surface of the resin pipe with an adhesive tape that has an adhesive with a cohesive force of 0.05 kg / 1 cm ² or more at 100 ° C and fix it. Then, after that, electric power is supplied to the heating wire of the joint body to perform fusion splicing, and a method for connecting a plastic pipe joint.