Connection structure of wave-shaped synthetic resin pipes, wave-shaped synthetic resin pipes used for the connection structure, and manufacturing method thereof

• US 20100126616A1
• Filed: 03/06/2009
• Published: 05/27/2010
• Est. Priority Date: 03/07/2008
• Status: Active Grant

• Current Assignee: Kanaflex Corporation (Kanaflex Corporation Co., Ltd.)
• Original Assignee: Kanaflex Corporation (Kanaflex Corporation Co., Ltd.)
• Inventors: KANAO, Shigeki
• Granted Patent: US 8,646,489 B2
• Time in Patent Office: Days
• US Class Current: 138/122
• CPC Class Codes: B29C 44/1295 Foaming around pipe joints
• CPC Class Codes: B29C 53/785 with reinforcements
• CPC Class Codes: F16L 11/15 corrugated F16L11/16 takes precedence
• CPC Class Codes: F16L 25/0036 Joints for corrugated pipes
• CPC Class Codes: F16L 47/065 with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket, the sealing rings being placed previously on the male part

Abstract

Provided are a connection structure for connecting corrugated synthetic resin pipes and a corrugated synthetic resin pipe used in the connection structure. The pipe is lightweight, low cost, and simply structured with a small number of components, having sufficient resistance to water and pressure, and excellent sealing performance without the use of robust material or requiring high precision, and capable of being easily connected and manufactured. A first corrugated synthetic resin pipe 1A is provided at an end 10 with a cylindrical insert end 3 formed by adhering a synthetic resin layer 5 to the outer surface of the end 10 so as to fill at least corrugated recesses a. A second corrugated synthetic resin pipe 1B is provided at an end 11 with a socket 4 formed by adhering synthetic resin to the outer surface of the end 11 and cylindrically extending the resin outwardly in the axial direction.

Claims

1. A connection structure for connecting two corrugated synthetic resin pipes at facing ends thereof, the corrugated synthetic resin pipes each including a pipe wall having a spirally corrugated shape, the connection structure comprising:

a cylindrical insert end at a facing end of a first corrugated synthetic resin pipe, the insert end being formed by adhering a synthetic resin layer to an outer surface of the end in such a manner as to fill at least corrugated recesses; and

a socket at a facing end of a second corrugated synthetic resin pipe, the socket being formed by adhering synthetic resin to an outer surface of the end and cylindrically extending the synthetic resin outwardly in an axial direction,

wherein the insert end of the first corrugated synthetic resin pipe is inserted into the socket of the second corrugated synthetic resin pipe so as to be connected to each other.

2. The connection structure for connecting corrugated synthetic resin pipes according to claim 1, further comprising a seal member between the insert end and the socket.

3. The connection structure for connecting corrugated synthetic resin pipes according to claim 2, wherein the insert end is provided on an outer surface thereof with an annular groove for accommodating the seal member.

4. The connection structure for connecting corrugated synthetic resin pipes according to claim 1, wherein among the socket and insert end, at least the socket contains reinforcing fiber in a synthetic resin portion thereof.

5. The connection structure for connecting corrugated synthetic resin pipes according to claim 4, wherein the reinforcing fiber contained in the synthetic resin portion is either embedded in a form of a woven cloth, a nonwoven cloth, or a resin molding, or added as chips.

6. The connection structure for connecting corrugated synthetic resin pipes according to claim 4, wherein the reinforcing fiber is made of glass fiber.

7. The connection structure for connecting corrugated synthetic resin pipes according to claim 1, wherein the socket includes a pipe material having a larger diameter than the second corrugated synthetic resin pipe, the pipe material being connected to the facing end of the second corrugated synthetic resin pipe in such a manner as to project coaxially from the outer surface of the end outwardly in the axial direction, and the pipe material having a synthetic resin layer adhered at least on an inner surface thereof.

8. The connection structure for connecting corrugated synthetic resin pipes according to claim 7, wherein the pipe material and the end of the second corrugated synthetic resin pipe are integrated together with the synthetic resin layer disposed therebetween.

9. A corrugated synthetic resin pipe used in the connection structure according to claim 1, the corrugated synthetic resin pipe comprising:

a pipe wall having a spirally corrugated shape;

a cylindrical insert end at one end, the insert end being formed by adhering a synthetic resin layer to an outer surface of the one end in such a manner as to fill at least corrugated recesses; and

a socket at the other end, the socket being formed by adhering synthetic resin to an outer surface of the other end and cylindrically extending the synthetic resin outwardly in an axial direction.

10. The corrugated synthetic resin pipe according to claim 9, wherein the insert end at the one end is provided on an outer surface thereof with an annular groove for accommodating the seal member.

11. The corrugated synthetic resin pipe according to claim 9, wherein, among the socket and the insert end, at least the socket contains reinforcing fiber in a synthetic resin portion thereof.

12. The corrugated synthetic resin pipe according to claim 11, wherein the reinforcing fiber contained in the synthetic resin portion is either embedded in a form of a woven cloth, a nonwoven cloth, or a resin molding, or added as chips.

13. The corrugated synthetic resin pipe according to claim 11, wherein the reinforcing fiber is made of glass fiber.

14. The corrugated synthetic resin pipe of according to claims 9, wherein the socket includes a pipe material having a larger diameter than the corrugated synthetic resin pipe, the pipe material being connected to the end of the corrugated synthetic resin pipe in such a manner as to project coaxially from the outer surface of the end outwardly in the axial direction, and the pipe material having a synthetic resin layer adhered at least on an inner surface thereof.

15. The corrugated synthetic resin pipe according to claim 14, wherein the pipe material and the other end are integrated together with the synthetic resin layer disposed therebetween.

16. The corrugated synthetic resin pipe of according to claim 9, wherein the socket includes a pipe material having a larger diameter than the corrugated synthetic resin pipe and projecting coaxially from the outer surface of the other end outwardly in the axial direction, and the synthetic resin material for the synthetic resin layer is injected into at least gaps between the pipe material and the corrugated synthetic resin pipe.

17. The corrugated synthetic resin pipe according to claim 16, wherein the pipe material has a pipe wall formed in a spirally corrugated shape similar to the pipe wall of the corrugated synthetic resin pipe.

18. A method for manufacturing the corrugated synthetic resin pipe according to claim 16, the method comprising:

forming the pipe wall of the corrugated synthetic resin pipe;

forming the pipe material having a larger diameter than the corrugated synthetic resin pipe on the other end of the corrugated synthetic resin pipe thus formed, the pipe material being formed coaxially with the corrugated synthetic resin pipe with support of a guide member from a radial outside;

sealing the pipe material thus formed at inner and outer ends in the axial direction using sealing chucks; and

injecting the synthetic resin material for forming the synthetic resin layer into the gaps between the pipe material thus sealed and the corrugated synthetic resin pipe.

19. The method for manufacturing the corrugated synthetic resin pipe according to claim 18, wherein at least one of the sealing chucks has an inlet for injecting the synthetic resin material.

20. The method for manufacturing the corrugated synthetic resin pipe according to claim 18, wherein during formation of the pipe material, continuously fed steel is deformation-processed to have an M-shaped cross section and then spirally discharged, and at the same time, an outer wound tape is continuously spirally discharged so as to be adhered to the outer surface of the steel and integrated in the axial direction, thereby providing the pipe material.