JPS61201989A - Method of reinforcing connecting section of fiber reinforcedplastic pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reinforcing an FRP pipe joint used in the field of FRP piping.

(Prior art) Conventionally, when connecting FRP pipes to each other via a joint, the sixth
As shown in the figure, after connecting the FRP pipe by inserting it into the FRP joint a, wrap glass fiber around the outside of the connection to prevent it from coming out, and then apply thermosetting resin and harden it. The connection part is strengthened.

(Problems with the Prior Art) However, the method for connecting FRP pipes as described above has various drawbacks as described below.

(1) FRP joint a (1)'
Since there are two stages M of 11bAm, it is difficult to wind the glass fiber C.

(2) Even when the glass fiber C is wound around the connection part, an air pocket d is created at the step part, and in the case of piping that flows high-temperature fluid, the air in the air pocket d expands and becomes thermosetting with the glass fiber. This causes the reinforcing member reinforced with the resin to peel off, reducing the reinforcing effect.

(3) Because the glass fiber C must be wrapped by hand, there are cases where it is not possible to wrap the glass fiber C in complex piping, and the disadvantage is that the work takes a long time and the construction cost is extremely high. be.

(Means for Solving the Problems) The present invention was made to solve the problems of the prior art, and its purpose is to simplify the reinforcing work of the connection between the FRP pipe and the joint. The purpose of the present invention is to provide a method for reinforcing an FRP pipe connection part that can be used to improve the overall strength of the FRP pipe and to fully exhibit the reinforcing effect.As a technical means to achieve this objective, the present invention provides a '! E
After connecting the FRP pipe and the joint using a cocoon-shaped reinforced glass fiber molded product shaped into a curved shape, the above-mentioned cocoon-shaped reinforced glass fiber molded product is attached to the joint between the FRP pipe and the joint.
! 4 to completely cover the connection part, and then apply and impregnate the thermosetting resin on this gate-shaped reinforced glass m-fiber molded product so that it is integrally adhered to the outer peripheral surface of the FRP pipe and joint. We decided to adopt a structure in which the joints are reinforced by hardening.

(Function) Therefore, if the method of the present invention is applied to connect an FRP pipe and a joint, most of the reinforcement work can be completed simply by applying the cocoon-shaped reinforced glass fiber molded product to the joint, and in addition, the FR
Since this cocoon-shaped reinforced glass fiber molded product also adheres to the stepped part between the P pipe and the joint, the reinforcing effect can be maintained at its initial state.
In particular, it can achieve a remarkable reinforcing effect and shorten the working time for FRP piping for high-temperature fluid transportation.

(Example) The method of the present invention will be explained below based on Examples.

First, as shown in Fig. 1, FRP@l, l is the joint 2
Insert and secure with adhesive.

Next, the cocoon-shaped reinforced glass fiber molded product 3 was formed into two parts.
．． 3 is pressed against both sides of the connection part to bring it into close contact, and then a thermosetting resin is applied and impregnated onto the scale-shaped reinforced glass fiber molded product 3.3 and hardened.

At this time, the thermosetting resin is the cocoon-shaped reinforced glass fiber molded product 3.
．． 3 is impregnated into the outer circumferential surfaces of the FRP pipe 1.1 and the joint 2, and is chemically bonded to the outer circumferential surfaces of the FRP pipe 1.1 and the joint 2, so that they are strongly adhered so that they do not peel off from each other due to external force.

This thermosetting resin.

Cocoon-shaped reinforced glass fiber molded product 3.3 is coated until the outer peripheral surface of the molded product is completely covered and cured to form a cocoon-shaped reinforced glass fiber molded product 3.
3. In addition to protecting 3.3, the cocoon-shaped reinforced glass fiber molded product 3.3
is firmly fixed onto the FRP pipe 1.1 and the joint 2 for reinforcement.

FIG. 2 is a cross-sectional view showing the connection between the FRP pipe 1.1 and the joint 2 reinforced by the method described above. The stepped portions 4.4 between 1.1 and the joint 2 are coated to prevent air pockets from forming.

In addition, in the above example, the cocoon-shaped reinforced glass fiber molded product 3.3
However, these molded products 3 and 3 use long and thin glass fibers, and use a mold made in the shape of the connection between the FRP pipe 1.1 and the joint 2, and the glass fibers and The FRP pipe reinforcing part 3a is formed by spraying adhesive and conforms to the outer shape of the FRP pipe 1.1, as shown in FIG.

3a, step reinforcing portions 3b, 3b that match the shape of the step between the FRP pipe 1.1 and the joint 2, and a joint reinforcing portion 3c that matches the outer shape of the joint 2.

Therefore, if this cocoon-shaped reinforced glass fiber molded product 3.3 is used, the outer periphery of the joint 2 can be completely covered with glass fiber, so there is no need to use an FRP joint, and instead of a conventional thermosetting resin molded product. Hands can be used.

In addition, when connecting the FRP joint 2 and the FRP pipe 1.1, as shown in FIG.
After manufacturing the cocoon-shaped reinforced glass fiber molded product 3.3 in which the P reinforcement parts 3a and 3a are long and inserting and connecting the FRP pipe 1 and the joint 2, a part of the FRP joint 2 is inserted as shown in Fig. 4. FRP'
This glass fiber molded article 3.3 may be placed over a portion of ll and l, and a thermosetting resin may be impregnated thereon and cured.

The thermosetting resin is not particularly limited, and commonly used polyester resins, vinyl ester resins, etc. can be used to achieve the purpose.

Also, depending on the type of piping, fittings of various shapes such as elbows, cheeses, and sockets are often used.
In the present invention, the shape of the glass fiber molded product to be molded into a scale shape is also molded to fit various joints such as elbows, cheeses, sockets, etc. and various FRP pipe forming shapes.

(Effects of the Invention) As explained above, according to the method of the present invention, a glass fiber molded product shaped into a scale shape is used, and this glass fiber molded product is brought into contact with the outer periphery of the connecting portion between the FRP pipe and the joint. By using a method of hardening with thermosetting resin from above, the time for piping construction can be significantly shortened, and since the glass fibers are evenly distributed on the outer peripheral surface of the connection, there is no variation in the reinforcing effect. It can produce various excellent effects such as no air pockets forming in the step part and the reinforcing effect can be maintained for a long time.
It is also highly effective in ensuring safety when constructing high-temperature fluid transport piping in thermal power plants, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the method of the present invention, FIG. 2 is a longitudinal cross-sectional view of the same, and FIG. 3 is a perspective view of a cocoon-shaped reinforced glass fiber molded product used in the method of the present invention. Fig. 4 is a longitudinal sectional view showing another embodiment of the method of the present invention, Fig. 5 is a perspective view of a cocoon-shaped reinforced glass fiber molded product, and Fig. 6 is an FRP made by the conventional method.
It is a longitudinal cross-sectional view of a pipe connection part. 1.1: FRP pipe 2: Joint

Claims (1)

[Claims] 1) After connecting the FRP pipes through the joint, a split reinforced glass fiber molded product shaped to closely fit the external shape of the joint is brought into contact with the joint between the FRP pipe and the joint to form the joint. A thermosetting resin is then applied onto the glass fiber molded product, impregnated and cured to integrally bond the outer peripheral surfaces of the FRP pipe and the joint to reinforce the joint. How to reinforce connections.