JP3499074B2 - Manufacturing method of resin pipe - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a resin pipe.

[0002]

2. Description of the Related Art In recent years, polyethylene pipes are often used as gas pipes. In the case of joining these polyethylene pipes together, conventionally, a collar is fitted over the ends of a pair of polyethylene pipes, and electric current is supplied to the electric resistance wire previously embedded inside the collar to generate heat. Therefore, it is general that these collars and tubes are heat-sealed to each other.

[0003]

However, in the case of performing heat fusion by energizing the electric resistance wire as described above, when the pipe has a large diameter, it takes a lot of time for fusion, There is a problem that the work efficiency for joining pipes is poor. Further, since electricity is supplied to the electric resistance wire, there is a problem that electric leakage is likely to occur especially in rainy weather.

Therefore, the present invention solves such a problem so that resin pipes such as polyethylene pipes can be easily joined in a short period of time without causing an accident such as an electric leakage. The purpose is to do.

[0005]

In order to achieve this object, the present invention has no projection on the outer circumference in a pipe manufacturing factory.
There is a seal material accommodating groove on the inner circumference at one end of a plastic resin tube
The end of the resin-made receiving member is integrated by heat fusion.
By doing so, a receiving port is formed at one end of the pipe, and the pipe is
Use the other end of the body as an insertion port,
Inserted inside the integrated socket member for joint connection
It was possible .

According to such a structure, the pipe manufacturing plant
At one end of the resin tube that does not have a protrusion on the outer periphery,
An end of a resin-made receiving member having a groove for accommodating a sealing material on the inner circumference
By integrating by heat fusion,
A receiving port is formed, and the other end of the tubular body is used as an insertion port.
The insertion port of the integrated receiving member of the other tube
Ru can be inserted for coupling junction therein. This
As described above, since the receiving port can be configured in advance by heat-sealing at the pipe manufacturing factory, not at the pipe joint joining site, workability at the pipe joint joining site is not deteriorated at all . Also, since it is not necessary to use electricity at the joint site of the pipe joint,
The occurrence of an electric leakage accident is reliably prevented. In addition,
Plastic pipes such as polyethylene pipes
Can be joined to each other, and only as simple construction as cast iron pipes
The pair of resin pipes can be joined with each other.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numerals 1 and 2 denote a pair of polyethylene pipes joined to each other, and these pipes 1 and 2 are ends of pipe bodies 3 and 3 having no protrusions on their outer circumferences. The receiving member 4 made of polyethylene and the insertion-portion outer peripheral projection 5 are heat-sealed to the respective parts.

That is, the receiving member 4 is for forming the receiving port 6 at the end portion of the one pipe 1, and the end portion 7 thereof is
At one end of the tubular body 3 constituting the above, heat is fused by heat generated by energizing the electrothermal resistance wire 8 of the buried structure. On the inner periphery of the receiving port 6 formed by the receiving port member 4, an annular sealing material accommodating groove 9 is formed in order from the opening end side, and an annular sealing material having a smaller diameter than the sealing material accommodating groove 9 and having a rectangular cross section. An inner peripheral protrusion 10 and an inner peripheral surface 11 having a diameter larger than that of the inner peripheral protrusion 10 are formed. 12 is the rear end face of the socket 6.

The other end of the tubular body 3 constituting the other tube 2 is an insertion port.
An insertion hole outer peripheral projection 5 having a rectangular cross section is heat-sealed to the outer periphery of the tip of the insertion port 14 by heat generated by energizing the electrothermal resistance wire 15 of the buried structure. . As shown in the figure, when the insertion port 14 is inserted into the receiving port 6 and the joining of the pipe joints is completed, the insertion port outer peripheral projection 5 is located at a position corresponding to the inner peripheral surface 11 of the receiving port 6, that is, It is arranged between the circumferential protrusion 10 and the rear end face 12.

The outer diameter of the outer peripheral projection 5 of the insertion opening is equal to the inner peripheral surface of the receiving opening 6.
The size is smaller than the inner circumference of 11 and larger than the inner diameter of the inner circumferential projection 10. Therefore, the socket 6
And when the escape force between the spigot 14 acts, by the spigot periphery projections 5 are mutually relates to the inner peripheral protrusion 10 from the back side of the socket 6, and these receptacles 6 spigot 14 is prevented from leaving. Further, as shown in the drawing, the axial dimension of the inner peripheral surface 11 is formed to be larger than the axial dimension of the insertion-portion outer peripheral protrusion 5, and therefore the insertion-portion outer peripheral protrusion 5 is formed as the inner peripheral protrusion 10. Back face
It is possible to freely expand and contract between the socket and the socket until it engages with 12.

An annular rubber seal material 16 is accommodated in the seal material accommodating groove 9, and the seal material 16 is accommodated in the accommodating groove 9
By being compressed between the bottom surface of the and the outer surface of the insertion port 14, it is configured to exhibit desired sealing performance.

An annular expansion preventing metal member 17 is externally fitted to the receiving port 6. In such a structure, the socket 6 of the pipe 1 and the insertion-portion outer peripheral projection 5 of the pipe 2 are preliminarily set at predetermined positions in the manufacturing plant of the pipes 1 and 2 due to heat generation of the electric resistance wires 8 and 15. It is heat fused to.

At the site of joining work between the pipes 1 and 2, the insertion port 14 is inserted into the receiving port 6 with the sealing material 16 attached to the receiving groove 9 of the receiving port 6. At this time, even if it is attempted to be inserted in a normal state, the insertion is impossible because the outer diameter of the insertion hole outer peripheral projection 5 is larger than the inner diameter of the inner peripheral projection 10 of the receiving opening 6. Further, as shown in the drawing, the inner diameter of the sealing member 16 is smaller than the inner diameter of the inner peripheral protruding portion 10 of the receiving opening 6. Since the sealing material 16 is made of rubber, the sealing member 16 may have some extent depending on the inner peripheral protruding portion 5. Although the diameter can be elastically expanded, it is still difficult to pass the insertion-portion outer peripheral projection 5 into the inside thereof.

[0014] Therefore, the tube 2 and the spigot utilizing the outer peripheral protrusion 5 is formed of polyethylene, folding the spigot 14 and spigot outer periphery projections 5 of the tube 2 fold resiliently necked to Then, the sealing material 16 and the inner circumferential projection 10 are passed through the positions. In FIG. 2, the insertion opening 14 and the insertion opening outer peripheral projection 5 are elastically contracted so as to fold the insertion opening 14 and the insertion opening outer projection 5 so that a recess 18 is formed at one location in the circumferential direction. The case where the diameter is made is illustrated. Further, FIG. 3 exemplifies a case where the diameter is elastically reduced so that the recesses 18 are respectively formed at three positions in the circumferential direction and four positions in the circumferential direction. The number of the recesses 18 formed is arbitrary.

By reducing the diameter in this way, the insertion opening 14 and the insertion opening outer peripheral projection 5 can be easily attached to the sealing material 16 and the inner peripheral projection 10.
The position of can be passed to the back side of the socket 6. If spigot outer peripheral projection 5 reaches the corresponding position located on the inner peripheral surface 11 through the inner peripheral protrusion 10, by restoring the original state by releasing the elastic diameter state , The joining of the pipe joint is completed as shown in FIG.

As described above, the pipe joint of FIG. 1 is a detachment prevention pipe joint in which the outer peripheral projection 5 of the insertion opening engages with the inner peripheral projection 10 of the receiving opening 6. 5 and the inner peripheral projection 10 of the receiving opening 6 are engaged with each other with a considerably strong force, and when a large withdrawal force is applied, the receiving opening 6 is formed of polyethylene. The mouth 6 may be deformed in the radial direction. If such deformation occurs, the engagement between the insertion-portion outer peripheral projection 5 and the inner peripheral projection 10 may be disengaged, and the required detachment prevention function may be lost.

Therefore, if there is such a possibility, the annular expansion preventing metal member 17 is fitted in the receiving port 6 so that such deformation in the radial direction can be surely prevented. .

[0018]

As described above, according to the present invention, a pipe is manufactured.
In a factory, one of the resin pipes that does not have protrusions on the outer circumference
Receptacle member made of resin having a sealing material accommodating groove on the inner periphery at the end
By integrating the ends of the tube by heat fusion,
The receiving end is formed at one end, and the other end of the tubular body is used as the insertion end.
The insertion port to the integrated receptacle of another pipe.
Ru can be inserted for coupling junction inside the member.
Thus, it is possible to configure in advance receptacle by thermal fusion bonding or the manufacturing plant of the tube rather than the bonding site of the pipe joint, Gana possible to completely reduce the workability of the bonding site of the pipe joint
Yes. In addition, since it is not necessary to use electricity at the joint site of the pipe joint, it is possible to reliably prevent the occurrence of an electric leakage accident. In addition,
Resin pipes such as polyethylene pipes with pipe joints with an insertion structure
They can be joined to each other and are as simple as cast iron pipes.
It is possible to join a pair of resin pipes with each other.

[Brief description of drawings]

FIG. 1 is a tree produced by the method for producing a resin pipe of the present invention.
It is sectional drawing of the principal part which shows a fat pipe .

FIG. 2 is a cross-sectional view showing a state in which a diameter is reduced so that a recess is formed at one location in the circumferential direction of an insertion opening and an insertion opening outer peripheral projection.

FIG. 3 is a sectional view showing a state in which the diameter is similarly reduced so that recesses are formed at three positions in the circumferential direction.

FIG. 4 is a sectional view showing a state in which the diameter is similarly reduced so that recesses are formed at four positions in the circumferential direction.

[Explanation of symbols]

3 Tubular body 4 Receptacle member 6 Receptacle 9 Sealing material accommodating groove

Claims (3)

(57) [Claims] 1. A pipe manufacturing plant has a protrusion on its outer periphery.
Do not insert a sealing material accommodating groove on the inner circumference at one end of the resin tube.
The end of the resin-made receiving member is integrated by heat fusion.
By configuring the receiving end at one end of the tubular body, and
Insert the other end of the storage tube into the other tube
For joint connection inside the integrated socket member
A method for manufacturing a resin pipe, which is insertable. 2. A resin tubular body having no protrusion on its outer periphery.
At the end, a sealing material accommodating groove and an inner peripheral projection are formed on the inner periphery.
The end of the resin-made receiving member is externally fitted and
The receiving port is configured by being integrated, and the tubular body
On the outer circumference of the other end, an outer diameter larger than the inner diameter of the inner circumferential protrusion
The peripheral protrusions are integrated by heat fusion to form the insertion port.
The insertion port to the integrated receptacle of another pipe.
The feature is that it can be inserted inside the member for joint connection.
Resin pipe fittings to be collected. 3. The insertion opening, in which the outer peripheral projection is integrated by heat fusion, can be inserted into the receiving opening while being reduced in diameter by elastic deformation, and by this insertion, the outer peripheral projection can be inserted into the receiving opening. The pipe joint for a resin pipe according to claim 2, wherein a diameter of the resin pipe can be expanded so as to restore the original state after passing through the circumferential protrusion.