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

• US 8,646,489 B2
• Filed: 03/06/2009
• Issued: 02/11/2014
• 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
• Primary Examiner(s): HOOK, JAMES F
• Application Number:
  US12/399,194
• Publication Number:
  US 20100126616A1
• Time in Patent Office: 1,803 Days
• Field of Search: 138/121, 138/122, 138/109, 285/110, 285/21.1, 285/293.1
• US Class Current: 138/109
• 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 2a. 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 drainage pipe connection structure for connecting a first corrugated synthetic resin pipe having an insert end at a connecting side end thereof to a second corrugated synthetic resin pipe having a a socket at a connecting side end thereof, comprising:

the first and second corrugated resin pipes consisting of a pipe body with steel reinforcing projections spirally formed onto the outer surface thereof;

wherein the insert end having a flat outer periphery by filling a synthetic resin into recesses between the reinforcing projections;

the socket having a pipe material consisting of a short corrugated synthetic resin pipe which has a larger diameter than the second corrugated synthetic resin pipe, the pipe material is arranged in a concentric pattern to the second corrugated synthetic resin pipe and connected to the second corrugated synthetic resin pipe integrally by filling a gap between the pipe material and the second corrugated synthetic resin pipe with a synthetic resin, a tip side of the pipe material is elongated in a pipe axis direction over the tip of the second corrugated synthetic resin pipe and composed so as to engage with the flat outer periphery of the insert end.

2. The drainage pipe connection structure according to claim 1, wherein the pipe material is covered with a synthetic resin layer only a tip part and a rear end part at the outer surface and entirety covered with the synthetic resin layer at the inner surface, the pipe material and the second corrugated synthetic resin pipe are connected and integrated by adhering the synthetic resin layer at the inner surface of the pipe material to the filled synthetic resin layer.

3. The drainage pipe connection structure according to claim 2, wherein the synthetic resin layer covering the inner surface of the pipe material is configured so as to closely contact with the flat outer periphery of the insert end.

4. The drainage pipe connection structure according to claim 2, wherein the insert end has a flat joint surface consisting of a synthetic resin in the orthogonal direction to the pipe axis at the connection side end of the first corrugated synthetic resin pipe, the socket having a flat joint surface at the back side which is capable of closely contacting with the flat joint surface of the insert end.

5. The drainage pipe connection structure according to claim 4, wherein the flat joint surface of the insert end has an annular groove and the seal member is placed therein.

6. The drainage pipe connection structure according to claim 2, wherein the synthetic resin layer and the filled synthetic resin layer contain reinforcing fiber consisting of glass fiber.

7. The drainage pipe connection structure according to claim 6, wherein the pipe material is connected to the corrugated synthetic resin pipe using a fixing screw.

8. The drainage pipe connection structure according to claim 6, wherein said pipe material is embedded in the synthetic resin layer on the tip side and the proximal side and the remaining portion is exposed.

9. The drainage pipe connection structure according to claim 1, wherein the reinforcing projections consist of a thin metal sheet having an angle shape of a cross-section and a synthetic resin layer covered thereon, the reinforcing projections are integrated with the pipe body by welding the synthetic resin layer covering the thin metal sheet and the synthetic resin layer covering the pipe body.

10. The drainage pipe connection structure according to claim 1, wherein said reinforcing projections form corrugations with peaks and valleys.

11. The drainage pipe connection structure according to claim 1, wherein said reinforcing projections are spirally wound and form corrugations with peaks and valleys.