Pipe with an outer wrap

Patent metadata

Field	Value
Publication number	US-10077857-B2
Application number	US-201715671871-A
Country	US
Kind code	B2
Filing date	Aug 8, 2017
Priority date	Jun 5, 2015
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with a reinforcing stiffener. The corrugated pipe may include an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. In some embodiments, a stiffener may be positioned within the corrugation valleys. In other embodiments, a stiffener may be positioned within the corrugation crests.

First claim

What is claimed is:

1. A pipe comprising:
an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;
an inner liner spanning the corrugation valleys; and
at least one stiffener positioned within at least one corrugation crest, wherein the at least one stiffener reinforces a peak of the at least one corrugation crest,
wherein a portion of an inner surface of the corrugated outer wall is free from contact with the at least one stiffener and the inner liner.

2. The pipe of claim 1 , further comprising an outer wrap applied to the outer wall, the outer wrap spanning the corrugation crests and producing a smooth outer surface.

3. The pipe of claim 1 , wherein the at least one stiffener extends between the liner and the peak of the at least one corrugation crest.

4. The pipe of claim 1 , wherein the at least one stiffener comprises:
an inner portion in contact with the liner;
an outer portion positioned within the peak of the at least one corrugation crest; and
a middle portion extending between the outer portion and the inner portion,
wherein the outer portion is wider than the middle portion and narrower than the inner portion.

5. The pipe of claim 1 , wherein the at least one stiffener comprises:
an inner portion in contact with the liner; and
an outer portion extending between the inner portion and the peak of the at least one corrugation crest,
wherein the outer portion is narrower than the inner portion.

6. The pipe of claim 1 , wherein the at least one stiffener has a circular cross-section or an oval-shaped cross-section.

7. The pipe of claim 1 , wherein the at least one stiffener is hollow and is at least partially filled with a filling material.

8. The pipe of claim 1 , wherein the at least one stiffener extends along at least a portion of the corrugated outer wall within the at least one corrugation crest.

9. The pipe of claim 1 , wherein the at least one stiffener comprises a filling material which at least partially fills the at least one corrugation crest.

10. The pipe of claim 9 , wherein the filling material comprises one or more of polyurethane foam, high melt polyethylene, or aluminum foam.

11. The pipe of claim 1 , wherein the at least one stiffener is constructed of one or more of steel, PVC, thermosetting material, or fiberglass.

12. The pipe of claim 1 , wherein one or more stiffener is configured within each corrugation crest.

13. The pipe of claim 12 , wherein the corrugation crests and the one or more stiffeners extend helically along a longitudinal axis of the bore.

14. A method of reinforcing a pipe comprising:
receiving a corrugated pipe having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;
positioning at least one stiffener within at least one corrugation crest; and
applying an inner liner to span the corrugation valleys and to cover the at least one stiffener such that a portion of an inner surface of the corrugated outer wall is free from contact with the at least one stiffener and the inner liner.

15. The method of claim 14 , further comprising applying an outer wrap to span the corrugation crests.

16. The method of claim 15 , wherein applying the outer wrap comprises:
determining a wrap type to be applied to the corrugated pipe;
determining a flow rate for applying a wrap of the wrap type based on a type of plastic used in the wrap, a type of fiber used in the wrap, and the wrap type; and
applying a wrap, having a smooth outer surface, made of the type of fiber and the type of plastic to the corrugated pipe using the determined flow rate.

17. The method of claim 14 , wherein positioning the at least one stiffener comprises positioning the at least one stiffener within a peak of the at least one corrugation crest.

18. The method of claim 14 , wherein applying the inner liner comprises applying the inner liner to the at least one stiffener.

19. The method of claim 14 , wherein positioning the at least one stiffener comprises filling the at least one corrugation crest with filling material.

20. The method of claim 14 , wherein positioning the at least one stiffener comprises positioning at least one stiffener within each corrugation crest.

21. A pipe comprising:
an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;
an inner liner spanning the corrugation valleys; and
at least one stiffener positioned within at least one corrugation crest, wherein the at least one stiffener reinforces a peak of the at least one corrugation crest and wherein the at least one stiffener comprises:
an inner portion in contact with the liner,
an outer portion positioned within the peak of the at least one corrugation crest, and
a middle portion extending between the outer portion and the inner portion, wherein the outer portion is wider than the middle portion and narrower than the inner portion.

22. A pipe comprising:
an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;
an inner liner spanning the corrugation valleys; and
at least one stiffener positioned within at least one corrugation crest, wherein the at least one stiffener reinforces a peak of the at least one corrugation crest,
wherein the at least one stiffener is hollow and is at least partially filled with a filling material.

23. A method of reinforcing a pipe comprising:
receiving a corrugated pipe having axially adjacent, outwardly-extending corrugation crests connected by corrugation valleys;
positioning at least one stiffener within at least one corrugation crest;
applying an inner liner to span the corrugation valleys and to cover the at least one stiffener; and
applying an outer wrap to span the corrugation crests, wherein applying the outer wrap comprises:
determining a wrap type to be applied to the corrugated pipe;
determining a flow rate for applying a wrap of the wrap type based on a type of plastic used in the wrap, a type of fiber used in the wrap, and the wrap type; and
applying a wrap, having a smooth outer surface, made of the type of fiber and the type of plastic to the corrugated pipe using the determined flow rate.

Assignees

• Advanced Drainage Syst

Inventors

• Vanhoose Bill Russell
• Piazza Nicholas James
• Vitarelli Ronald Robert
• Atchison Owen Michael
• Frost Tyler James

Classifications

• F16L9/121

  with three layers · CPC title

• B29C63/26

  Lining or sheathing of internal surfaces (B29C63/38 takes precedence) · CPC title

• F16L11/115 Primary

  having reinforcements not embedded in the wall · CPC title

• F16L11/15

  corrugated (F16L11/16 takes precedence) · CPC title

• B29L2023/22

  Tubes or pipes, i.e. rigid (bent tubes not for use as pipe couplings B29L2023/004) · CPC title