JPH0571676A - Pipe joint structure - Google Patents

Abstract

PURPOSE:To provide a pipe joint structure using adhesives in which the simple operability of a TS engineering method can be sufficiently maintained and even if an adhesive function is lost the elastic contact between a pipe receiving port and pipe inserting port is sufficiently held to ensure a sealing property to a certain degree so that sudden water leakage can be sufficiently excluded. CONSTITUTION:A core 13 is provided in a pipe receiving port 11. The outer peripheral surface of a pipe inserting port 21 is bonded to the inner peripheral surface of the pipe receiving port through an adhesive 3 and the inner surface of the pipe inserting port is locked in the outer surface of the core in the direction of withdrawing the pipe inserting port.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive-type pipe connecting structure used for connecting a plastic pipe such as a vinyl chloride pipe with an adhesive.

[0002]

2. Description of the Related Art When joining a plastic pipe, particularly a vinyl chloride pipe, the inside of the taper of the pipe receiving port (usually 1/30 to
1/45 taper) and the outer surface of the pipe insertion port are respectively coated with an adhesive agent, and the pipe insertion port is inserted into this pipe receiving port, so-called T
The S method may be used.

This construction method is widely used in construction piping sites because it requires no skill and can be easily constructed.
In the TS method, since the inside of the pipe receiving taper of the pipe joint and the outside of the pipe inserting port are swollen with the adhesive, the pipe inserting port is inserted into the receiving port during that time. Taper
Due to the effect and the lubricating effect of the swelling layer, even if the inner diameter of the inner part of the pipe receiving hole is slightly smaller than the outer diameter of the pipe insertion port, it can be inserted with a comparatively small force, which is one of the advantages of the TS method. ..

FIG. 7 is a partial vertical cross-sectional view of a pipe connecting portion using a TS joint. Normally, in the depth C'of the pipe receiving port 11 ', the pipe receiving port 11' side is widened and the pipe receiving port 21 'is opened. The sides are squeezed and there is elastic contact between them. 3'denotes an adhesive.

[0005]

However, in the pipe connecting portion using the TS method, adhesion failure, for example,
If there is uneven coating of adhesive, etc., the pipe insertion often escapes from the pipe receiving port of the pipe joint and the water in the pipe leaks all at once, and in this case, a water leakage accident is sudden, There was no time to repair it, and the interior of the building was inundated, resulting in excessive damage.

[0006] In the pipe connection portion using the conventional TS method, the seal resistance and pull-out strength are totally dependent on the adhesive. However, in reality, the elastic contact between the pipe receiving port and the pipe inserting port also contributes to the seal to some extent due to the familiarity and adhesion due to the elasticity, and the function of the adhesive is completely lost. Even if it is done, it is considered that the sealability can be maintained to some extent if the elastic contact can be maintained. However, the conventional TS type joint does not have such a holding function.

It is an object of the present invention to easily maintain the simple workability of the TS method in a pipe connecting portion using an adhesive, and
Even if the adhesive function is lost, the elastic contact between the pipe receiving port and the pipe insertion port can be well maintained and a certain degree of sealability can be guaranteed.
It is an object of the present invention to provide a pipe connection structure capable of satisfactorily eliminating sudden water leakage.

[0008]

In the pipe connecting portion structure of the present invention, a core is provided in the pipe receiving port, and the pipe outer peripheral surface and the pipe receiving inner peripheral surface are bonded with an adhesive, The configuration is characterized in that the space between the inner surface of the insertion opening and the outer surface of the core is locked in the pull-out direction of the tube insertion opening.

[0009]

Since the state between the inner peripheral surface of the pipe receiving opening and the outer peripheral surface of the pipe inserting opening is the same as that of the TS joint, the simple workability of the TS construction method can be maintained. Moreover, even if the adhesive interface between the pipe receiving port and the pipe inserting port is completely peeled off, due to the engagement between the outer surface of the core provided in the pipe receiving port and the inner surface of the pipe receiving port, the inside of the pipe receiving port is locked. Since the tube insertion port can be held fixed and the elastic contact between the tube receiving port and the tube insertion port can be maintained, a certain degree of sealability can be guaranteed and TS
Unlike the construction method, it is possible to prevent sudden water leaks and to handle water leak accidents with sufficient time.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross section showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a plastic (for example, vinyl chloride) pipe joint, and as shown in FIG. 2A, a pipe having a taper inner surface (1/30 to 1/45). A receiving port 11 is provided, and a core 13 having a locking projection 12 on the tip peripheral surface is fixed to the inner end of the pipe receiving port 11. Reference numeral 2 denotes a plastic pipe, and as shown in FIG. 2B, a locking groove 22 is formed on the inner surface of the pipe insertion port 21. The outer peripheral surface of the pipe insertion port 21 is adhered to the inner peripheral surface of the pipe receiving port 11 with the adhesive 3, and the locking projection 12 on the outer surface of the core 13 is inserted into the locking groove 22 on the inner surface of the pipe insertion port 21. It is locked in the direction in which the mouth 21 is pulled out.

In assembling the above-mentioned pipe connecting portion structure, the adhesive 3 is applied to the inner peripheral surface of the pipe joint 11 and the outer peripheral surface of the pipe insertion port 21 of the pipe joint 1, and then the pipe insertion port 21 is connected to the pipe reception port. 11 by inserting. In this case, the distance H from the rear end of the pipe receiving port 11 to the locking projection 12 is H ≧ h with respect to the distance h from the tip of the pipe inserting port 21 to the locking groove 22. The pipe insertion port 21 is inserted into the pipe receiving port 1 with the tip of the pipe 21 contacting the inner end of the pipe receiving port 11 or in a state of being slightly separated.
1 can be inserted via an adhesive 3.

In the pipe connecting structure of the pipe of the present invention,
The inner surface of the pipe receiving port 11 and the outer surface of the pipe receiving port 21 are not directly engaged with each other, and the outer surface of the core 13 fixed to the pipe receiving port 11 and the pipe receiving port 21 are fixed.
Since the inner surface of the pipe is locked between the inner surface of the pipe and the inner surface of the pipe, as in the case of using the conventional TS method, the outer peripheral surface of the pipe insertion port 21 and the inner peripheral surface of the pipe receiving port 11 can be bonded with the adhesive 3 and Behind the mouth 11, the pipe receiving port 11 and the pipe inserting port 21 can be elastically brought into contact with each other. Moreover, in the pipe connecting portion structure of the present invention,
Even if the adhesive 3 fails to perform its function, the pipe insertion port 21 can be held fixed to the pipe insertion port 11, and the elasticity between the pipe insertion port 11 and the pipe insertion port 21 at the inner side of the pipe reception port can be maintained. Since the static contact can be maintained, it is possible to guarantee a certain degree of sealability by the elastic contact. Therefore, it is possible to avoid a sudden leak of water at the pipe connection portion using the conventional TS method, and to keep the leak to a gentle level.

In the above description, the core 13 in the pipe joint 1 may be provided with a slit 131 as shown in FIG. 3A so as to allow elastic diameter reduction. The locking projection 12 of the core 13 may be provided at an intermediate position of the core 13, as shown in FIG.

As shown in FIG. 4, a locking projection 221 is used in place of the locking groove on the inner surface of the pipe insertion port 21, and the locking projection 221 and the locking projection 12 on the outer surface of the core 13 are used. May be locked.

Further, in order to cope with variations in the insertion amount of the tube insertion opening, a plurality of locking grooves or locking projections on the inner surface of the tube insertion opening or a plurality of locking projections on the outer surface of the core are provided at different positions. You can also

The above pipe joint is usually manufactured by injection molding in a form having a core integrally, but the core is manufactured separately, and the core 13 is connected to the TS joint 10 as shown in FIG. It is also possible to fix it to the rear end of the receptacle with an adhesive 31 or with a screw 32 as shown in FIG. In this case, a metal material can be used for the core 13.

When the pipe connecting structure of the present invention is assembled using a pipe joint, depending on the state of the pipe, other than the socket,
It is possible to use elbows, teeth, etc., and to connect between one end of the pipe joint and the pipe by a packing tightening system, a screw system or the like depending on the type of the pipe.

When one end of the pipe joint is connected to one end or both ends of the pipe in the factory and the pipe to be connected is connected to the other end of the pipe joint in the field, the pipe connection of the present invention is performed only in the field. Part structure can be used. In this case, as shown in FIG. 6, for fixing the pipe 4 and one end of the pipe joint 1 in the factory, TS method and heat fusion method under strict working conditions. Etc. can be used.

The present invention can also be used for connection between a pipe receiving opening formed by expanding one end of a plastic pipe and a pipe inserting opening (a core having a locking projection on the outer surface is fixed to the inner end of the pipe receiving opening). Then, the tube insertion opening and the tube receiving opening are bonded with an adhesive, and the locking groove or the locking projection on the inner surface of the tube insertion opening is locked to the locking projection on the outer surface of the core).

[0021]

The structure of the connecting portion of the pipe of the present invention is as described above, and the pipe receiving port and the pipe inserting port are connected to the outer surface of the core fixed to the inner end of the pipe receiving port and the pipe inserting port. It is locked with the inner surface, and despite the locking between the two, the pipe receiving port and the pipe insertion port can be easily connected with one touch like the conventional TS method (for example, clamps and bolts). If the removal is to be performed with and, the number of work steps is large and complicated), and the simple workability of the TS method can be maintained. In addition, even if the function of the adhesive is lost, the elasticity of the tube insertion hole behind the tube insertion hole prevents the tube insertion hole from coming off due to the locking between the tube reception port and the tube insertion hole. Since it is possible to maintain good physical contact, unlike the conventional pipe connection part by the TS construction method, it is possible to avoid sudden water leakage and keep it slow. Therefore, repairs can be made before serious problems such as interior flooding occur, and damage can be limited.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of the present invention.

2 (A) is a sectional view showing a pipe joint in the embodiment of FIG. 1, and FIG. 2 (B) is a sectional view showing a pipe insertion opening of the embodiment.

3 (a) and 3 (b) are partial cross-sectional views showing a different pipe joint different from the above used in the present invention.

FIG. 4 is a partial cross-sectional view showing a locking projection on the inner surface of the tube insertion opening used in the present invention.

5 (a) and (b) of FIG. 5 are partial cross-sectional views of another pipe joint different from the above used in the present invention.

FIG. 6 is a cross-sectional view of a pipe with a joint used in the present invention.

FIG. 7 is a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

 11 Pipe Receiving Port 12 Locking Protrusion 13 Core 21 Pipe Inserting Port 22 Locking Groove 3 Adhesive

Claims (1)

[Claims] 1. A core is provided in a pipe receiving opening, and an outer peripheral surface of the pipe receiving opening and an inner peripheral surface of the pipe receiving opening are bonded with an adhesive, and a space between the inner surface of the pipe inserting opening and the outer surface of the core is a pipe inserting opening. A pipe connection structure characterized by being locked in the pull-out direction. ..