EP0157506A1 - Fabrication des tubes en béton - Google Patents

Fabrication des tubes en béton Download PDF

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Publication number
EP0157506A1
EP0157506A1 EP19850301608 EP85301608A EP0157506A1 EP 0157506 A1 EP0157506 A1 EP 0157506A1 EP 19850301608 EP19850301608 EP 19850301608 EP 85301608 A EP85301608 A EP 85301608A EP 0157506 A1 EP0157506 A1 EP 0157506A1
Authority
EP
European Patent Office
Prior art keywords
mould
tube
pipe
concrete
flexible
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP19850301608
Other languages
German (de)
English (en)
Inventor
Philip Jeffrey Hodgkinson
Edmund Thomas Hinch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain PAM UK Ltd
Original Assignee
Stanton and Staveley Ltd
Stanton PLC
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 Stanton and Staveley Ltd, Stanton PLC filed Critical Stanton and Staveley Ltd
Publication of EP0157506A1 publication Critical patent/EP0157506A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/76—Moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/90—Methods or apparatus for demoulding or discharging after shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/10—Moulds with means incorporated therein, or carried thereby, for ejecting or detaching the moulded article
    • B28B7/12—Moulds with means incorporated therein, or carried thereby, for ejecting or detaching the moulded article by fluid pressure, e.g. acting through flexible wall parts or linings of the moulds

Definitions

  • This invention relates to the manufacture of concrete pipes and tubes in moulds.
  • a method of manufacturing a concrete pipe or tube comprising the steps of forming a mould from flexible material; depositing concrete within the mould and compacting it so as to form a concrete pipe or tube therein; and introducing a fluid under pressure between the flexible mould and the concrete pipe or tube such as to expand the flexible mould from the pipe or tube and then withdrawing the pipe or tube from within the mould.
  • apparatus for manufacturing a concrete pipe or tube including a mould of flexible material; means for introducing between the mould and the concrete pipe or tube when formed therewithin a fluid under pressure so as to expand the mould and means for withdrawing the pipe or tube from the mould thereafter.
  • the concrete pipe or tube may be formed, for example, by depositing one or more layers of concrete within an external mould or mandrel mounted so as to be rotatable about its longitudinal axis so that the concrete pipe or tube is formed by centrifugal action within the mould from which it is subsequently removed.
  • the internal surface of the mould may, prior to the formation of a product therewithin, be coated with a release agent.
  • the flexible mould may be seamless and may be formed from fibre (or glass) reinforced plastics. It may, in accordance with usual mould practice, be fabricated so as to define by its inner peripheral wall, in usual manner, the external form of the concrete pipe or tube to be manufactured within that mould.
  • the mould may be provided with spigot and socket forms at each end, or may be plain ended.
  • the fluid may be air from a compressed air supply.
  • the compressed air may be suplied to the mould via one or more entry ports along the length thereof or may, as an alternative, be supplied at one or both ends of the mould.
  • the concrete pipe or tube may be matured and hardened within the flexible mould before removal thereof.
  • the mould may be removed before the concrete is cured and hardened.
  • means may be provided to support the internal surface of the concrete to resist the forces due to the fluid under pressure during mould withdrawal acting on the outer surface of the concrete.
  • the fluid under pressure is then introduced between the outer concrete surface and the flexible mould, as described previously, and the flexible mould removed. After this, the internal support is removed and the concrete pipe or tube left to cure and harden sufficiently for handling.
  • the internal support may be a simple flexible steel shell with means of reducing and expanding the circumference to allow it to be inserted and withdrawn from the inside of the pipe or tube. Once inside the pipe or tube, the flexible shell is increased in diameter, just sufficient to give support to the unhardened concrete.
  • the mould comprises a tube 1 formed from glass reinforced plastics such as a polyester resin incorporating glass and silica sand.
  • the mould may be formed by spraying the sand and polyester resin upon a rotating seamless steel mandrel of slightly tapered longitudinal form and winding glass about the mandrel so that it is incorporated within the wall of the mould.
  • the mould is provided with a socket end 2 and a spigot end 3.
  • the mould and its included pipe are taken to a demoulding assembly as shown in Figure 2 comprising a restraining post 5 mounted on a base 6 which is secured to a floor 7, the post passing through the pipe and mould and carrying at its upper end a pipe restraining ring 8.
  • a lifting beam 9 is connected by means of an eye 10 to a lifting device (not shown) which carries, by means of tie bars 11, a bucking ring 12 which is located under the socket end of the mould but does not extend radially inwards of the mould and does not underlie the concrete pipe.
  • a plurality of compressed air connections 13 are made through the. wall of the mould.
  • the connectors can be coupled through a ring main (not shown) so that one snap coupling only is necessary to a compressed air supply.
  • the air holes on the inside of the mould are covered prior to moulding to prevent concrete contamination.
  • annular pressure chamber 14 is mounted on to the end of the mould and sealed with a gasket 15, 16 at each extremity.
  • the mould expands when pressurised air from pipes 17 tracks along the mould/pipe interface and releases the bond.
  • the mould Upon application of either of these methods, the mould is expanded somewhat radially away from the pipe, and upon axial load being applied by the lifting device of the mould, this is then removed from the pipe which can then be taken away from the demoulding assembly.
  • a flexible mould was formed from isophthalic polyester resin bonded with glass and silica sand.
  • the mould wall thickness was 6mm and the mould material had a stiffness of 1100 N.mm 2 .
  • Air pressure prior to demoulding was 6 bar. This was applied through a plurality of connectors along the length of the pipe (either 3 connectors or 9 connectors being used in practice).
  • the concrete pipe (of 525mm diameter bore) formed within the mould was successfully removed from the mould.
  • Fibre reinforced plastics is a typically suitable material having the required flexibility with strength characteristics required by the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
EP19850301608 1984-03-12 1985-03-08 Fabrication des tubes en béton Withdrawn EP0157506A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848406425A GB8406425D0 (en) 1984-03-12 1984-03-12 Production of concrete products
GB8406425 1984-03-12

Publications (1)

Publication Number Publication Date
EP0157506A1 true EP0157506A1 (fr) 1985-10-09

Family

ID=10557940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850301608 Withdrawn EP0157506A1 (fr) 1984-03-12 1985-03-08 Fabrication des tubes en béton

Country Status (6)

Country Link
EP (1) EP0157506A1 (fr)
JP (1) JPS612511A (fr)
AU (1) AU3975885A (fr)
DK (1) DK109685A (fr)
GB (2) GB8406425D0 (fr)
NO (1) NO850981L (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2412108B (en) * 2004-03-19 2008-12-24 Pvaxx Res & Dev Ltd Load-carrying apparatus and methods of manufacture
US9138945B2 (en) 2005-04-26 2015-09-22 Paxxal Inc. Load carrying apparatus and method of manufacture

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612673A (en) * 1949-03-09 1952-10-07 Vacuum Concrete Inc Expansible molding core
DE2611293A1 (de) * 1975-03-20 1976-09-30 Kurimoto Hume Pipe Ltd Verfahren zur herstellung armierter schleuderbeton-rohre
GB1573271A (en) * 1976-04-06 1980-08-20 Schlosser & Co Gmbh Mould for concrete samples
DD150022A1 (de) * 1980-04-03 1981-08-12 Theo Stiegler Vorrichtung zum entschalen von formteilen mittels druckluft
AT366313B (de) * 1979-10-11 1982-04-13 Eternit Werke Hatschek L Vorrichtung zum herstellen eines rohres bzw. rohrformstueckes aus faserzement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1228886A (fr) * 1968-09-13 1971-04-21
BE794780A (fr) * 1972-01-31 1973-05-16 Precision Flexmold Appareil pour le moulage d'objets
US4308970A (en) * 1978-11-27 1982-01-05 Holdt J W Von Plastic bucket defining annular inwardly projecting ridge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612673A (en) * 1949-03-09 1952-10-07 Vacuum Concrete Inc Expansible molding core
DE2611293A1 (de) * 1975-03-20 1976-09-30 Kurimoto Hume Pipe Ltd Verfahren zur herstellung armierter schleuderbeton-rohre
GB1573271A (en) * 1976-04-06 1980-08-20 Schlosser & Co Gmbh Mould for concrete samples
AT366313B (de) * 1979-10-11 1982-04-13 Eternit Werke Hatschek L Vorrichtung zum herstellen eines rohres bzw. rohrformstueckes aus faserzement
DD150022A1 (de) * 1980-04-03 1981-08-12 Theo Stiegler Vorrichtung zum entschalen von formteilen mittels druckluft

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2412108B (en) * 2004-03-19 2008-12-24 Pvaxx Res & Dev Ltd Load-carrying apparatus and methods of manufacture
US9138945B2 (en) 2005-04-26 2015-09-22 Paxxal Inc. Load carrying apparatus and method of manufacture

Also Published As

Publication number Publication date
GB2155397B (en) 1987-01-21
GB2155397A (en) 1985-09-25
DK109685D0 (da) 1985-03-11
JPS612511A (ja) 1986-01-08
GB8506028D0 (en) 1985-04-11
DK109685A (da) 1985-09-13
NO850981L (no) 1985-09-13
AU3975885A (en) 1985-09-19
GB8406425D0 (en) 1984-04-18

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT LI LU NL SE

17P Request for examination filed

Effective date: 19860327

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: STANTON PLC

17Q First examination report despatched

Effective date: 19880201

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19880614

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HODGKINSON, PHILIP JEFFREY

Inventor name: HINCH, EDMUND THOMAS