WO1979000079A1 - Ebauche pour la fabrication d'un tube - Google Patents

Ebauche pour la fabrication d'un tube Download PDF

Info

Publication number
WO1979000079A1
WO1979000079A1 PCT/SE1978/000023 SE7800023W WO7900079A1 WO 1979000079 A1 WO1979000079 A1 WO 1979000079A1 SE 7800023 W SE7800023 W SE 7800023W WO 7900079 A1 WO7900079 A1 WO 7900079A1
Authority
WO
WIPO (PCT)
Prior art keywords
blank
bulge
pipe
adjacent
edges
Prior art date
Application number
PCT/SE1978/000023
Other languages
English (en)
Inventor
O Elmqvist
Original Assignee
O Elmqvist
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by O Elmqvist filed Critical O Elmqvist
Priority to DE19782856968 priority Critical patent/DE2856968A1/de
Publication of WO1979000079A1 publication Critical patent/WO1979000079A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
    • F16L11/16—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics wound from profiled strips or bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/78—Winding and joining, e.g. winding spirally helically using profiled sheets or strips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement

Definitions

  • This invention relates to a blank for pipe manufacture and has the object of producing a pipe blank adapted for continuous pipe manufact- ' ⁇ re in connection with immediate laying of the pipe, for example in the sea on great depth.
  • a pipe blank according to the invention is designed so that it is pos sible in immediately consecutive steps to extrude the pipe blank, to roll the pipe blank to a pipe with a diameter within a wide diameter range, to attach adjacent turns comprised in the pipe to each other and to lay the pipe thus manufactured into position in lakes, the sea or in earth on land.
  • the pipe blank shown in the drawing consists of a first lateral edge 11 , a second lateral edge 12, a central portion 13 located between said two lateral edges, a first plane wall portion 14 jointing said first lateral edge 11 and said central portion 13, and a second plane wall portion 15 jointing said second lateral edge 12 and said central portion 13.
  • the lateral edge 11 is formed with a trapezoid outward bulge 16
  • the lateral edge 12 is formed with an inward bulge 17 correspond ⁇ ing to the outward bulge 16.
  • the pipe blank is intended to be wound helically so that a joint is formed between adjacent turns in the helically wound pipe thereby, that the outward bulge 16 in a turn is fitted into the inward bulge 17 in an adjacent turn.
  • Said central portion 13 has an outward bulge of such configuration, that the .surface 18 enclosing the bulge is substantially greater than the surface 21 between the two adjacent edges 19, 20 on the blank, which edges constitute the places of attachment of the bulge.
  • the surface 18 enclosing the bulge further includes distances, for example, the distance 22, approximately in parallel with the transverse direction of the wall blank, which distances are substantially longer than the distance 23 between the adjacent edges 19, 20 on the blank.
  • the blank shown in the drawing by way of example has an outward bulge in the central portion 13 of substantially circular shape. Said bulge will be located on the outside of the completed pipe. Said bulge has the twofold object of providing the pipe with an elastic "bellows" function in order to reduce the stres ses arising by the effect of wave movements on the pontoon, to which the pipe is attached, and of rendering the pipe more rigid against compression.
  • the detail design of the bulge depends on the strength properties of the pipe material and on the "bellows" function, which the pipe can be imagined to suit ⁇ ably carry out in individual cases.
  • the inside of the pipe is desired to be as smooth as possible in order to permit the highest possible degree of laminar flow through the pipe.
  • the ratio between the surface 18 enclosed by the bulge and the surface 21 between the edges 19, 20 is about 50 :1.
  • the ratio between the longest distance -within the bulge in parallel with the transverse direction of the wall blank, i. e . the diameter, and the shortest distance 23 between the adjacent edges 19, 20 is about 15 :1.
  • a pipe made only of polythene plastics is lighter than water, and therefore the plastic material for pipes to be laid on great depth in the sea preferably should be admixed with some kind of filler material, for example soot, graphite, talc or the like, in order to suitably adjust the weight of the completed pipe to the weight of the ambient water.
  • a suitable material composition may be about 7 parts of polythene and 1 part of graphite, yielding a mass having substantial ⁇ ly the same density as sea water.
  • the bulge 16 is formed with a cavity 24, and the lateral edge 12 is provided with two horns 25, 26 in immediate connection to the inward bulge 17.
  • special members for example rollers, on the machine, which forms the blank to a pipe, it is easy to somewhat compres s the outward bulge 16 and to cause the horns 25, 26 to slightly approach each other during the moment when a new turn in the pipe is to be attached to the nearest adjacent turn in the pipe.
  • the horns 25, 26 like the bulge of the central portion 13 also have a stiffening effect and counteract compres sion of the pipe.
  • the surface 27 of the lateral edge 11 which surface is located on the same side as the outward bulge 16 is welded to the surface 28 of the lateral edge 12, which surface is located on the same side as the inward bulge 17, and the surface 29 of the lateral edge 11 , which surface is located closer to the central portion 13 than the surface 27, is welded to the surface 30 of the lateral edge 12, which surface is located farther away from the central portion 13 than the surface 28.
  • the completed pipe thus, shows continuous welding joints on both sides of the continuous place of attachment 16-17.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

Ebauche pour la fabrication d'un tube, destinee a etre enroulee helicoidalement de maniere a former un joint entre deux spires adjacentes dans une ebauche enroulee helicoidalement. A cet effet, une partie sur un bord lateral (11) de l'ebauche dans une spire s'ajuste dans une partie de l'autre bord lateral (12) de l'ebauche dans une spire adjacente. Une partie (13) situee entre les deux dites parties sur les bords lateraux presente une saillie vers l'exterieur enfermant une cavite. Cette saillie a une forme telle que la surface (18) de la cavite comprise dans une coupe transversale de l'ebauche est sensiblement plus grande que la surface (21) comprise dans ladite section entre les deux bords adjacents (19, 20). Ces derniers sont les endroits de fixation de la protuberance. La surface (18) de la cavite inclut de plus des distances (22) dans ladite coupe sensiblement parallele a la direction transversale de l'ebauche formant paroi. Ces distances sont plus grandes que la distance (21) entre les bords adjacents (19, 20) sur l'ebauche. Lorsqu'on forme un tube, la saillie se trouve a l'exterieur du tube termine. Elle a deux effets: donner au tube le role d'un soufflet elastique de maniere a reduire les contraintes lors de mouvements du tube, et rendre le tube plus resistant a la compression.
PCT/SE1978/000023 1977-08-02 1978-07-17 Ebauche pour la fabrication d'un tube WO1979000079A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782856968 DE2856968A1 (de) 1977-08-02 1978-07-17 Blank for pipe manufacture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7708787A SE7708787L (sv) 1977-08-02 1977-08-02 Emne for framstellning av ror
SE7708787 1977-08-02

Publications (1)

Publication Number Publication Date
WO1979000079A1 true WO1979000079A1 (fr) 1979-02-22

Family

ID=20331944

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1978/000023 WO1979000079A1 (fr) 1977-08-02 1978-07-17 Ebauche pour la fabrication d'un tube

Country Status (6)

Country Link
EP (1) EP0006882A1 (fr)
JP (1) JPS5452184A (fr)
DK (1) DK332778A (fr)
GB (1) GB2021033B (fr)
SE (1) SE7708787L (fr)
WO (1) WO1979000079A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4457787A (en) * 1982-09-21 1984-07-03 Chugai Denki Kogyo Kabushiki-Kaisha Internal oxidation method of Ag alloys
US4664314A (en) * 1982-10-01 1987-05-12 Spraying Systems Co. Whirl spray nozzle
GB2128709A (en) * 1982-10-16 1984-05-02 C J Cawte Drainage pipes
USD968335S1 (en) * 2020-05-29 2022-11-01 Xinghua Wei Socket
USD971850S1 (en) * 2020-08-17 2022-12-06 Yuyi Lee Power solution dome

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE346082B (fr) * 1968-04-05 1972-06-26 Dynamit Nobel Ag
DE2321553A1 (de) * 1972-08-30 1974-03-21 Steward Plastics Vorrichtung zum herstellen schraubenfoermig gewundener plastischer rohrleitungen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE346082B (fr) * 1968-04-05 1972-06-26 Dynamit Nobel Ag
DE2321553A1 (de) * 1972-08-30 1974-03-21 Steward Plastics Vorrichtung zum herstellen schraubenfoermig gewundener plastischer rohrleitungen

Also Published As

Publication number Publication date
SE7708787L (sv) 1979-02-03
GB2021033B (en) 1982-05-06
EP0006882A1 (fr) 1980-01-23
JPS5452184A (en) 1979-04-24
GB2021033A (en) 1979-11-28
DK332778A (da) 1979-02-03

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