JPS6321074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first pipe made of fiber-reinforced resin and a second pipe (for example, an iron pipe, This invention relates to a pipe joint structure for joining vinyl chloride pipes, hume pipes, and stainless steel pipes.

When connecting a first tube and a second tube that have different Young's moduli, the difference in Young's modulus causes a difference in the amount of deformation when internal pressure is applied, making the connection difficult. It is very weak and will be destroyed.

The present invention forms grooves at predetermined pitches on the outer surface of a first tube made of fiber-reinforced resin and a second tube made of a material having a Young's modulus larger than that of the first tube, Then, an outer joint pipe is laminated between the outer surfaces of the first and second pipes whose end surfaces are in mutual contact with each other, and this outer joint pipe is wound with mat, roving, mat, piano wire, mat, and roving in this order. Then, an inner joint pipe is laminated between the inner surfaces of the first and second pipes, and this inner joint pipe is formed by wrapping mats, rovings, and mats in this order, and then hardening them with resin. The present invention provides a pipe joint structure characterized in that it is formed by hardening, and according to this structure, by wrapping pine or roving and hardening with resin, a strong outer joint pipe and inner joint pipe can be formed. and the first
The second pipe can be connected and watertight, and the Young's modulus of the first and second pipes can be made uniform by applying prestress by tightening the piano wire. In addition, since a groove is formed on the bonding surface between the outer joint tube and the second tube with a large Young's modulus, the adhesive force between them is strong, and the stress at the joint between the tubes caused by the difference in Young's modulus is It is possible to prevent the outer joint pipe and the second pipe from shifting or peeling due to concentration.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is a first pipe made of fiber-reinforced resin; 2 is a second pipe made of a material having a Young's modulus larger than that of the first pipe 1 (for example, an iron pipe, a vinyl chloride pipe, a humid pipe, a stainless steel pipe); ). A plurality of grooves 3 are formed on the outer periphery of the end of the second tube 2. This groove 3 has a width (W) of 0.5 to 3 mm and a depth (H)
is 0.5 to 2 mm, with a constant pitch of 1 to 20 mm (P)
Several are formed every other time. An outer joint tube 4 is laminated between the outer surfaces of the tubes 1 and 2 with their end surfaces in mutual contact with each other. That is, the outer joint pipe 4 is made by wrapping two plies of mats 5 and 6, rovings 7, mats 8, piano wire 9, mats 10, and rovings 11 in this order and hardening them with resin 12. is forming. Here, the diameter of the piano wire 9 is
It is 0.5 to 2 mm, and is tightened by tightly rolling it and applying prestress. An inner joint tube 13 is stacked between the inner surfaces of both tubes 1 and 2. That is, the inner joint pipe 13 is formed by wrapping two ply mats 14 and 15, a roving 16, and a mat 17 in this order and hardening them with resin 18. In addition, the inner joint pipe 13 may be further wound with rovings and mats alternately.

According to the present invention having the above configuration, by wrapping the pine or roving and hardening it with resin, a strong outer joint pipe and an inner joint pipe are formed, and the first pipe made of fiber-reinforced resin and the first The first and second tubes can be connected to a second tube made of a material having a Young's modulus greater than that of the first tube, and can be watertight. By making the Young's modulus of the second tube uniform, it is possible to prevent the second tube from being destroyed. In addition, since a groove is formed on the bonding surface between the outer joint tube and the second tube with a large Young's modulus, the adhesive force between them is strong, and the stress at the joint between the tubes caused by the difference in Young's modulus is It is possible to prevent the outer joint pipe and the second pipe from shifting or peeling due to concentration.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a longitudinal sectional front view of the main part, and FIG. 2 being an enlarged longitudinal sectional front view of the main part. 1...First pipe, 2...Second pipe, 3...Groove,
4... Outer joint pipe, 5, 6, 8, 10, 14, 1
5,17...Matsuto, 7,11,16...Roving, 9...Piano wire, 12,18...Resin, 1
3...Inner joint pipe.

Claims (1)

[Claims] 1 A tube coupling structure that couples a first tube made of fiber-reinforced resin and a second tube made of a material having a Young's modulus greater than that of the first tube, the outer surface of the second tube being grooves at predetermined pitches are formed in the outer joint pipe, and an outer joint pipe is laminated between the outer surfaces of the first and second pipes with their end faces in mutual contact with each other, and this outer joint pipe is made of mats, rovings, mats, pianos, etc. formed by wrapping wire, mat, and roving in this order and hardening with resin, and laminating an inner joint pipe between the inner surfaces of the first and second pipes,
This inner joint pipe has a pipe joint structure characterized in that it is formed by wrapping mats, rovings, and mats in this order and hardening them with resin.