JPH0338554Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is used in the field of plant piping that handles high-temperature acids and alkalis, hot springs, thermal power generation, etc.
Regarding reinforcing members for FRP piping connections.

(Conventional technology and its problems) FRP pipes are widely used in the field of plant piping that handles high-temperature acids and alkalis, hot springs, thermal power generation, etc., but conventionally, when connecting FRP pipes, joints After inserting an FRP pipe into this FRP joint and connecting the two chemically or physically, glass fiber is wrapped around the outside of the connection, and this is impregnated with thermosetting resin and hardened. The connections were reinforced.

However, this method of reinforcing the joint has the following problems.

(1) There is a step between the FRP joint and the FRP pipe, making it difficult to wrap glass fiber.

(2) Even if glass fiber is wrapped around the connection part, air pockets will occur at the step, and in the case of piping that flows high-temperature fluid, the air in the air pocket will expand and the glass fiber and thermosetting resin will form. The reinforced reinforcing member is peeled off and the reinforcing effect is reduced.

(3) Workability is poor because the glass fiber must be wrapped by hand.

(4) In some cases, putty filling or resin welding is performed to eliminate the level difference at the connection part, but even for small diameter pipes, this process alone takes more than 10 minutes and the processing cost is extremely high. There is.

(5) FRP fittings are used as fittings to connect FRP pipes, but FRP fittings are complicated to form and are much more expensive than general fittings, increasing the overall cost of piping materials. do.

(Means for solving the problems) The present invention was devised to solve the problems of the prior art, and its purpose is to extremely strengthen the connection between the FRP pipe and the joint. The object of the present invention is to provide a reinforcing member that is easy to install and that can ensure sufficient rigidity and impact resistance even when thermoplastic resin joints are used instead of conventional FRP joints. As a technical means to achieve this objective, the present invention uses a joint reinforcement part shaped to fit tightly around the outer periphery of a thermoplastic resin joint, and a pipe shaped to fit tightly around the outer periphery of an FRP pipe. A reinforcing member consisting of a reinforcing part and a step reinforcing part formed at the boundary between the joint reinforcing part and the pipe reinforcing part and having an inner surface shaped into a shape that closely contacts the end face of the thermoplastic resin joint, the reinforcing member The structure is made of multiple split glass fiber molded parts divided in the axial direction.

(Function) Therefore, when reinforcing the joint between an FRP pipe and a thermoplastic resin joint using the reinforcing member of the present invention, after connecting the FRP pipe with the thermoplastic resin joint, , a joint reinforcing portion shaped to tightly adhere to the entire outer periphery of the thermoplastic resin joint;
A pipe reinforcement part shaped to fit closely to the outer periphery of the FRP pipe, and a step reinforcement formed at the boundary between the joint reinforcement part and the pipe reinforcement part and shaped so that the inner surface fits tightly to the end face of the thermoplastic resin joint. After applying a plurality of split glass fiber molded parts having a section and being divided in the axial direction from the outside and tying them with an appropriate string, a thermosetting resin is applied from above the split glass fiber molded parts. This is done by applying the coating and impregnating it into a split glass fiber molded product and hardening it.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Figure 1 shows a split glass fiber molded product 1 constituting the reinforcing member A of the present invention.
The joint reinforcement part 1a and the FRP pipes 3, 3 are shaped to tightly fit the entire outer periphery of the thermoplastic resin joint 2.
Pipe reinforcement part 1 shaped into a shape that closely fits the outer periphery of
b, 1b, joint reinforcement part 1a and pipe reinforcement part 1b, 1
The step reinforcing portions 1c, 1c are formed at the border of the thermoplastic resin joint 2, and the inner surfaces thereof are shaped to closely fit the end surfaces 2a, 2a of the thermoplastic resin joint 2, and are divided into two in the axial direction.

When using, two molded products 1, 1
This covers the joints between the FRP pipes 3, 3 and the thermoplastic resin joint 2. The split glass fiber molded product 1 is integrally molded by spraying a glass mat into a mold using an adhesive as a binder, and can be molded in large quantities in the same shape in a short time. The shape and size of the molded product 1 can be adjusted by changing the mold. Further, as the glass fiber, various commonly used glass chips, glass cloth, etc. can be used.

Therefore, when reinforcing the connection between the FRP pipe and the thermoplastic resin joint with the reinforcing member A of this example,
As shown in Fig. 2, after connecting the FRP pipes 3, 3 via the thermoplastic resin joint 2, the two split glass fiber molded products 1 are connected to the FRP pipes 3, 3 and the thermoplastic resin joint 2. The split glass fiber molded product 1 is applied to the connecting portion from the outside and tied to the connecting portion with an appropriate string. At this time, as shown in FIG.
However, on the outer periphery of the FRP pipes 3, there are pipe reinforcement parts 1b,
1b further includes the end face 2 of the thermoplastic resin joint 2.
Step reinforcing portions 1c, 1c are in contact with a. In this state, resin is impregnated into the split glass fiber molded product 1 and then hardened to form the FRP pipe 3.
3 and the thermoplastic resin joint 2 are fixed together.

Although the embodiments of the present invention have been described above based on the drawings, the specific embodiments of the present invention are not limited to the above embodiments. For example, in the embodiments, a socket joint is used as a thermoplastic resin joint. However, elbow joints, cheese joints, cross joints, etc. may also be used, and when connecting FRP pipes using these joints, the outer circumference of these thermoplastic resin joints and the connection between these joints and the FRP pipe must be A split glass fiber molded product is used by molding it into a shape that matches the outer circumferential shape of the connection part. Further, when the pipe diameter becomes large or the shape of the joint becomes complicated, it is also possible to divide the reinforcing member A into two, three, or four parts.

(Effects) Since the present invention is configured as described above, FRP
In addition to making it extremely easy to reinforce the joint between the pipe and the thermoplastic resin joint, the joint reinforcement part is made of a split glass fiber molded product that is shaped to tightly fit around the outer periphery of the thermoplastic resin joint, and the FRP A pipe reinforcement section that is shaped to fit closely to the outer periphery of the pipe, and a step reinforcement that is formed at the boundary between the joint reinforcement section and the pipe reinforcement section and whose inner surface is shaped so that it fits tightly to the end face of the thermoplastic resin joint. This has the outstanding effect of giving the connection part the same rigidity and impact resistance as when using conventional FRP joints, even without using FRP joints. . In addition, in the present invention, the reinforcing member is shaped to closely fit the outer periphery of the thermoplastic resin joint and the outer periphery of the connection between the joint and the FRP pipe, so air does not accumulate in the step part and the hot spring Even when used in fields that transport high-temperature fluids, such as piping, plant piping, and steam piping in thermal power plants, the reinforcing member does not peel off, and it has the advantage that it can be used for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a split glass fiber molded product constituting the reinforcing member of the present invention, Fig. 2 is an explanatory view showing how the reinforcing member of the invention is used, and Fig. 3 is a sectional view of the same. . A... Reinforcement member, 1... Split glass fiber molded product, 2... Thermoplastic resin joint, 3, 3...
FRP pipe.

Claims (1)

[Claims for Utility Model Registration] A joint reinforcing portion 1a formed into a shape that closely fits the outer periphery of the thermoplastic resin joint 2, and a pipe reinforcing portion 1a formed into a shape that tightly fits the outer periphery of the FRP pipes 3, 3. 1b
and a reinforcing member A consisting of step reinforcing parts 1c, 1c formed at the boundary between the joint reinforcing part 1a and the pipe reinforcing part 1b, and the inner surface of which is shaped into a shape that closely contacts the end face of the thermoplastic resin joint 2. A reinforcing member for an FRP pipe joint, characterized in that the reinforcing member A is formed of a plurality of split glass fiber molded products 1 divided in the axial direction.