JPH0594594U - Plastic pipe joint structure - Google Patents

Abstract

(57) [Abstract] [Purpose] When connecting pipes whose outer surface is made of plastic, to enable easy and reliable connection without causing water leakage at the connection part of the pipes that are connected at the insertion and reception ports. With the goal. [Constitution] At least an outer surface of a pipe 1 made of plastic
In the joining, the foam sheet 4 impregnated with the adhesive 3 is preliminarily laminated on the outer surface of the insertion port 2, and the insertion port 2 is inserted into the receiving port 5 in a state where the foam sheet 4 is compressed, and the adhesive impregnated sheet 4 is interposed therebetween. The outer surface of the insertion slot 2 and the inner surface of the receiving slot 5 are sealed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint structure for a plastic pipe, and more particularly to a joint structure for an improved FRP pipe or FRPM pipe having at least an outer surface made of plastic.

[0002]

[Prior Art]

 Conventionally, a fiber reinforced plastic pipe (FRP) or a fiber reinforced plastic / mortar composite pipe (FRPM) may be used as a pipe for agricultural water or sewage. When joining these plastic pipes, as with other pipes, the insertion port is inserted and fixed in the receiving sleeve, but since the outer surface of the plastic pipe is smooth and it has a certain elasticity, the sealing of the joint part is done. However, there is a concern that the sealing with a rubber ring is lacking in certainty. Therefore, the outer surface of the insertion port and the inner surface of the receiving port are adhered and fixed to each other by using an adhesive to connect this kind of plastic pipe.

[0003]

[Problems of conventional technology]

 However, when manufacturing pipes, the inner surface is usually accurately regulated, but the outer surface has a large tolerance, especially when filament winding (FW) is used. There was a drawback that this finishing work was troublesome. In addition, if this finish is not perfect, there is a gap between the outer surface of the insertion opening and the inner surface of the receiving sleeve, and if the viscosity of the adhesive is low, there is a gap that causes water leakage.

On the other hand, when the viscosity of the adhesive is high, the adhesive applied to the outer surface of the insertion slot may be squeezed off by the end surface of the insertion slot when the insertion slot is inserted into the receiving sleeve, and therefore the adhesive is applied. There was a problem that gaps tended to occur due to differences in layer thickness. Therefore, when the connection with the adhesive is performed, there is a drawback that the work is considerably troublesome, such as the need to raise and stuff the adhesive after the construction in order to prevent water leakage from the above-mentioned gap.

[0005]

[Problems to be solved by the device]

 In view of the above problems, the present invention has been made with the object of providing a joint structure for plastic pipes that can be easily and surely connected without causing water leakage when connecting at least outer pipes made of plastic. Is.

[0006]

[Means for Solving the Problems]

 That is, according to the plastic pipe joint structure of the present invention, a foam sheet impregnated with an adhesive is pre-layered on the outer surface of the insertion opening in a joint of pipes having an outer surface made of plastic, and the foam sheet is compressed. The insertion opening is inserted into the receiving sleeve, and the outer surface of the insertion opening and the inner surface of the receiving sleeve are sealed via an adhesive impregnated sheet.

[0007]

【Example】

 Next, an embodiment of this invention will be described. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an explanatory sectional view showing a bonding step.

The joint structure of the plastic pipe of the present invention is such that at least the outer surface of the FRP pipe, the FW pipe, or the FRPM pipe 1 (FRPM pipe in the illustrated example) whose outer surface is made of plastic is bonded to the outer surface of the insertion port 2 with the adhesive 3 The foamed sheet 4 impregnated with is preliminarily laminated, and the insertion port 2 is inserted into the receiving sleeve 5 in a state where the foamed sheet 4 is compressed, and the outer surface of the insertion port 2 and the receiving sleeve are inserted through the adhesive impregnated sheet 4. 5 The inner surface is sealed.

In the above-described embodiment, the laminating means for the foamed sheet 4 is performed by winding a band-shaped adhesive impregnated sheet and externally fitting the sleeve-shaped foamed sheet 4 according to the outer diameter of the insertion opening. . When the foam sheet 4 impregnated with the adhesive is likely to be displaced due to friction when the insertion port 2 is inserted into the receiving sleeve 5, the foam sheet 4 is bonded and fixed to the outer surface of the insertion port in advance.

The foam sheet 4 is preferably an open-cell foam plastic sheet. Further, as the adhesive, one having an affinity for the plastic forming the outer surface of the pipe is used, and for example, a two-liquid mixed type epoxy resin adhesive, urethane adhesive or the like is used.

[0011]

[Action]

 In this invention, since the outer surface of the insertion slot 2 is surrounded by the elastic foam sheet 4, when the insertion slot 2 is inserted into the receiving sleeve 5, the foam sheet 4 is compressed and even if there is a slight outer surface error. The gap between the outer surface of the insertion slot 2 and the inner surface of the receiving sleeve 5 is filled, and the adhesive impregnated in this state cures, so that both can be reliably bonded and at the same time complete sealing is performed.

[0012]

[Effect of the device]

 As described above, the present invention ensures reliable adhesion because the adhesive-impregnated foamed plastic sheet 4 is used for bonding even if a plastic tube having a large outer surface error and a smooth surface and elasticity is connected. It is possible to prevent water leakage. Further, when the present invention is carried out, it is sufficient to prepare a foamed sheet impregnated with an adhesive, so that the present invention has various practical effects such as easy implementation.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view showing the bonding step of the example.

[Explanation of symbols]

 1 Pipe at least the outer surface of which is plastic 2 Insertion port 3 Adhesive 4 Foamed sheet 5 Receiving sleeve

Claims (1)

[Scope of utility model registration request] 1. When joining a pipe having at least an outer surface made of plastic, a foam sheet impregnated with an adhesive is preliminarily laminated on the outer surface of the insertion opening, and the insertion opening is inserted into a receiving sleeve in a state in which the foam sheet is compressed. A joint structure for a plastic pipe, wherein the outer surface of the insertion opening and the inner surface of the receiving sleeve are sealed via an adhesive impregnated sheet.