JPS643035Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a joint of a composite pipe in which a fiber-reinforced resin layer is provided on the outer periphery of a synthetic resin pipe.

(Prior Art and Its Disadvantages) The above-mentioned composite pipe has excellent chemical resistance and impact resistance, and is used for piping for transporting chemical liquids. Conventionally, this type of composite pipe has been joined by a joining method in which the pipe is inserted into a socket of a pipe joint used for general piping through an adhesive.

However, at this joint, the chemical solution permeates through the fiber-reinforced resin layer exposed at the end of the pipe or the interface between the fiber-reinforced resin layer and the synthetic resin pipe, corrodes the fiber-reinforced resin layer, and reduces the strength of the fiber-reinforced resin layer. At the same time, there was a drawback that the chemical solution leaked.

As a tube joint to improve these drawbacks, for example, Japanese Utility Model Publication No. 51-39224 proposes a tube joint in which packing is sandwiched between the tube ends.
However, in this case, a complete sealing effect cannot be obtained unless the cut surface of the pipe is finished smooth, making it unsuitable for on-site construction.Also, it takes a lot of man-hours to finish the surface, and it takes a long time until the tape-wrapped reinforcing part hardens. The tubes had to be held together.

(Purpose) In view of the above-mentioned drawbacks, the present invention provides a tube joint with excellent sealing performance by a conventional joining method by simply performing simple processing.

(Structure) The gist of the present invention is that, at the pipe joint where composite pipes each having a fiber-reinforced resin layer provided on the outer periphery of the synthetic resin pipe are joined to the socket of a pipe joint via an adhesive, the pipe is inserted into the socket. The pipe joint part is characterized in that at least the fiber-reinforced resin layer of the composite pipe is divided into an annular notch in the circumferential direction, and the notch is filled with a water-stopping material. Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a partially omitted longitudinal cross-sectional view of an example of the present invention.

Reference numerals 1 and 1 designate composite tubes, which are formed by providing fiber-reinforced resin layers 3, 3 on the outer peripheries of synthetic resin tubes 2, 2.

The synthetic resin pipes 2, 2 may be made of hard vinyl chloride resin, polypropylene, polyamide, or the like.

The fiber-reinforced resin layers 3, 3 are made of a reinforcing material such as glass fiber or synthetic fiber, and a thermosetting resin such as unsaturated polyester resin, epoxy resin, or vinyl ester resin.

4 is a socket type pipe joint made of synthetic resin or fiber-reinforced resin. The inner diameter of the pipe joint 4 is made slightly larger than the outer diameter of the composite pipe 1.

Reference numeral 5 denotes an adhesive, which may be any adhesive as long as it has adhesive properties to both the composite pipe 1 and the pipe joint 4. For example, an epoxy resin-based adhesive, a vinyl ester resin-based adhesive, or the like is used.

Near the end of the composite pipe 1 in the pipe joint 4 is cut out in an annular shape in the circumferential direction, and a cutout part 6 having a substantially semicircular cross section is provided. In FIG. 1, the notch 6 reaches as far as the synthetic resin pipe 2, but it suffices if it is cut out in the circumferential direction so that at least the fiber-reinforced resin layer 3 is divided.

The shape of the notch 6 may be semicircular, letter-shaped, or V-shaped. The position where the notch 6 is provided is not particularly limited as long as it is within the pipe joint 4,
It may also be the end of the composite pipe 1, 1 as shown in FIG. Also, the number of notches 6 is 2 for each composite pipe.
There may be more than one.

The notch 6 is filled with a water-stopping material 7. In FIGS. 1 and 2, the waterproof material 7 is the same adhesive as the adhesive 5, but it may be a different type of adhesive or a sealant.

Then, adhesive is applied to the outer periphery of the composite pipes 1, 1 so that the notches 6, 6 shown in FIGS. A tube joint is formed by insertion and curing.

(Effects) The pipe joint of the present invention is constructed as described above.
an annular notch in the circumferential direction so that at least the fiber-reinforced resin layer of the composite pipe in the pipe joint is divided;
Since the notch is filled with a water-stopping material, penetration of a transport medium such as a chemical solution is blocked in the notch filled with the water-stopping material.

Therefore, the strength of the composite pipe does not decrease due to corrosion of the fiber-reinforced resin layer, and the composite pipe has excellent sealing performance and durability over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted vertical cross-sectional view of one example of the present invention, and FIG. 2 is a partially omitted vertical cross-sectional view of another example of the present invention. 1,1...composite pipe, 2,2...synthetic resin pipe,
3, 3...Fiber reinforced resin layer, 4...Pipe joint, 5...
...Adhesive, 6,6...Notch, 7,7...Water stop material.

Claims (1)

[Scope of utility model registration request] At a pipe joint where composite pipes each having a fiber-reinforced resin layer provided on the outer periphery of the synthetic resin pipe are joined to a socket of a pipe joint via an adhesive, at least the fiber-reinforced resin of the composite pipe is inserted into the socket. A pipe joint characterized by having an annular notch in the circumferential direction so that the layer is divided, and the notch is filled with a water-stopping material.