EP0406612B1 - Verfahren und Vorrichtung zur Herstellung von verstärkten Betonrohren - Google Patents

Verfahren und Vorrichtung zur Herstellung von verstärkten Betonrohren Download PDF

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Publication number
EP0406612B1
EP0406612B1 EP90111506A EP90111506A EP0406612B1 EP 0406612 B1 EP0406612 B1 EP 0406612B1 EP 90111506 A EP90111506 A EP 90111506A EP 90111506 A EP90111506 A EP 90111506A EP 0406612 B1 EP0406612 B1 EP 0406612B1
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EP
European Patent Office
Prior art keywords
nucleus
mold
vibrating
head
concrete
Prior art date
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Expired - Lifetime
Application number
EP90111506A
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English (en)
French (fr)
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EP0406612A1 (de
Inventor
Croci Piero
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.)
Croci Mario & Figli Srl
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Croci Mario & Figli Srl
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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
    • B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
    • B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
    • B28B21/14—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means vibrating, e.g. the surface of the material
    • B28B21/16—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means vibrating, e.g. the surface of the material one or more mould elements

Definitions

  • the object of the present invention is a process and relative equipment for realizing pipes in concrete reinforced with preassembled cages, used particularly in sewage mains.
  • Pipes of this type are at present realized with different systems, all of which have different kinds of drawbacks.
  • a first system consists in setting a horizontally positioned mold in fast rotation, inside of which the pipe is formed by centrifugation. This system allows concrete pipes to be realized with or without reinforcement; it is, however, very expensive and also has the drawback of segregation of the components of the mixture.
  • Another system consists in realizing the pipe vertically, by means of a rotating mandrel provided with fins, shaped like the portions of a propeller. These fins compress the ccncrete introduced into the mold, generating an upward thrust of the mandrel until the pipe is completely formed. With this system it is not possible to insert a reinforcement in the pipe, since the fins of the mandrel would interfere with it.
  • a variation of this process is the "Packerhead” system, which uses a rotating mandrel provided with rollers tangential to the internal diameter of the pipe, which cast and distribute the ccncrete beyond the reinforcement and then compress it, thanks to their high rotation speed.
  • the disadvantages of this method are the high power required, severe wear on the mandrel components and the torsion to which the reinforcement is subjected. This torsion occurs in spite of the use of several series of overlapping, counter-rotating rollers and of hydraulic cylinders positioned on several horizontal planes, intended to enter the reinforcement and counteract its rotation.
  • Another system of manufacture, to which the present invention relates, is that using pressure-vibration. This consists of locating a vibrating nucleus inside a mold, which is gradually filled with concrete which is compacted by the vibrating nucleus.
  • DE-C-882 667 and FR-A-1 246 252 describe devices for manufacturing pressure-vibrated concrete pipes, which are not reinforced and in which the whole head of the nucleus, positioned axially inside a mold, is vibrated.
  • the aim of the present invention is to realize a process and relevant equipment for manufacturing in particular pressure-vibrated reinforced concrete pipes which will prevent the generation of tangential forces, which cause the rotation of the concrete and, consequently, the deformation of the reinforcements.
  • rigid reinforcements consisting of preassembled metallic cages, composed of longitudinal rods and circumferential rods joined together by welding or binding.
  • This aim is achieved with the process according to the invention, which foresees a relative feed motion of a nucleus in an external mold, into which the concrete is gradually fed and distributed, being compacted gradually, as it is fed, by means of a vibrating part of the head of the nucleus.
  • This vibrating part has a first truncated-conical length provided with radial separators, suitable for preventing the rotation of the vibrated concrete and therefore of the reinforcement, if any, which is inserted into the mold, and a perfectly cylindrical band which gauges and smooths off the internal wall of the pipe during formation.
  • the remainder of the nucleus is not vibrated, including the frontal part of the head, consisting of a conical body on which rotating blades are located which distribute the concrete in the annular chamber which is formed between the vibrating part of the head of the nucleus and the mold.
  • 1 indicates a cylindrical body or nucleus, positioned vertically on axis with an external mold 2, into which it can be inserted.
  • the mold 2 is located on a base ring 3, on which a rigid metallic reinforcement 4 also rests, housed inside the mold.
  • the reinforcement 4 comprises circumferential rods 5, connected to each other by longitudinal rods 6.
  • a vibrating part 7 is foreseen on the head of the nucleus 1, insulated resiliently from it by means of dampening devices 8, shown with shading in figure 2.
  • the vibrating part 7, which is set in vibration by known means positioned inside it, has a first truncated-conical length 9, on which radial separators 10 are positioned, joined together by a cylindrical band 11, whose diameter is substantially equal to that of the body of the nucleus 1.
  • the end part or top of the head of the nucleus consists of a conical body 12, which does not vibrate either, on which the blades 13 rotate.
  • Concrete 14 is fed, for example by being dropped from a conveyor belt 15, into the mold 2, prearranged as in figure 1.
  • the concrete drops onto the head of the nucleus 1 and is distributed by the rotating blades 13, with the aid of the conveyor cone 12, in the annular space which is formed between the mold 2 and the vibrating part 7 of the head, burying the reinforcement 4.
  • relative feed motion is foreseen of the nucleus 1 in the mold 2. This relative feed motion can be obtained by providing the nucleus 1 with a rising motion, or by providing the mold 2 with a downward motion, or by moving the nucleus 1 and the mold 2 jointly.
  • the concrete 14 is gradually compacted by the vibrating part 7 of the head. While it is being compacted, the separators 10, foreseen on the truncated-conical length 9 of the vibrating part, prevent the rotation of the vibrated concrete, and therefore the torsion of the reinforcement 4, which is kept perfectly in a rectilinear vertical position.
  • the cylindrical band 11 which follows the truncated-conical length 9 of the vibrating part 7 gauges and smoothes the internal wall of the pipe 16 being formed.
  • the compacting of the wall of the pipe 16 is therefore due to the truncated-conical length 9 of the vibrating part 7, through the action of centrifugal force generated by the vibrator positioned in it.
  • the specific shape of the vibrating part 7 and the feed motion of the nucleus 1 in the mold 2, generate forces whose components - both radial and vertical (the latter directed upwards) - act on the cement mixture, which surrounds the reinforcement 4 without leaving empty spaces.
  • the finish of the upper part of the pipe 16 is obtained as usual, by means of a smoothing ring (not shown), provided with rotary motion and vertical pressure, from top to bottom.
  • the finished pipe is then slid out of the mold 2 and transported to the drying area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Claims (7)

  1. Verfahren zur Herstellung von vibrationsgepreßten Betonrohren (16), bei dem der Beton (14) in eine vertikale, einen Kern (1) umschließende Form (2) gefüllt und durch ein am Kopf des Kerns (1) angeordnetes Vibrationselement (7) verdichtet wird, welches kleinere Abmessungen als der Körper des Kerns aufweist und zwischen nichtvibrierenden Teilen angeordnet ist, die aus dem Körper des Kerns (1) und aus dem Endteil oder Oberteil (12) des Kopfes des Kerns bestehen, dadurch gekennzeichnet, daß eine Vorschubbewegung des Kerns (1) in der Form (2) vorgesehen ist, und daß das Vibrationselement (7) des Kerns (1) einen ersten kegelstumpfformigen Abschnitt (9) aufweist, der mit radialen Separatoren (10) versehen ist, die geeignet sind, die Drehung des Betons bei seiner Verdichtung zu verhindern, und auf den ein zylindrisches Band (11) folgt, das geeignet ist, die innere Wand des geformten Rohres (16) abzurichten und zu glätten.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß es die Positionierung einer starren Verstärkung (4) in der Form (2) vorsieht, so daß ein verstärktes Rohr (16) erhalten wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das nichtvibrierende Endteil bzw. Oberteil (12) des Kopfes des Kerns (1) durch einen konischen Abschnitt gebildet ist, an dem rotierende Schaufeln (13) angeordnet sind, die geeignet sind, den Beton (14) gleichmäßig in dem ringförmigen Raum zu verteilen, der zwischen der Form (2) und dem Vibrationselement (7) des Kerns (1) gebildet ist.
  4. Einrichtung zum Herstellen von vibrationsverdichteten Betonrohren (16), die einen vertikalen Kern (1) enthält, der axial bezüglich einer äußeren Form (2) positioniert ist, in die Beton (14) gefüllt wird, z.B. durch Einschütten, wobei der Kern (1) in Verbindung mit seinem Kopf ein Vibrationselement (7) besitzt, welches zwischen zwei nichtvibrierenden Teilen positioniert ist, die aus dem Körper des Kerns (1) und aus dem Endteil oder Oberteil (12) des Kopfes des Kerns bestehen, dadurch gekennzeichnet, daß der Kern (1) mit einer relativen Vorschubbewegung bezüglich der Form (2) versehen ist, und daß das Vibrationselement (7) einen ersten kegelstumpfförmigen Abschnitt (9) mit radialen Separatoren (10) enthält, auf den ein zylindrisches Band (11) folgt, dessen Durchmesser im wesentlichen gleich dem des Körpers des Kerns (1) ist.
  5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Vibrationselement (7) vom Körper des Kerns (1) durch Dämpfungsvorrichtungen (8) elastisch isoliert ist und in gleicher Weise vom Endteil oder Oberteil (12) des Kopfes des Kerns elastisch isoliert ist.
  6. Einrichtung nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß das nichtvibrierende Endteil bzw. Oberteil (12) des Kopfes des Kerns durch einen konischen Körper gebildet ist, an dem rotierende Schaufeln (13) positioniert sind.
  7. Einrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß zwischen dem Kern (1) und der Form (2) eine starre Verstärkung (4) positioniert ist.
EP90111506A 1989-07-03 1990-06-19 Verfahren und Vorrichtung zur Herstellung von verstärkten Betonrohren Expired - Lifetime EP0406612B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8921074A IT1230976B (it) 1989-07-03 1989-07-03 Procedimento ed apparecchiatura per la realizzazione di tubi in calcestruzzo armato.
IT2107489 1989-07-03

Publications (2)

Publication Number Publication Date
EP0406612A1 EP0406612A1 (de) 1991-01-09
EP0406612B1 true EP0406612B1 (de) 1993-10-20

Family

ID=11176350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111506A Expired - Lifetime EP0406612B1 (de) 1989-07-03 1990-06-19 Verfahren und Vorrichtung zur Herstellung von verstärkten Betonrohren

Country Status (4)

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EP (1) EP0406612B1 (de)
DE (1) DE69004015T2 (de)
ES (1) ES2047761T3 (de)
IT (1) IT1230976B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK71291D0 (da) * 1991-04-19 1991-04-19 Pedershaab Maskinfabrik As Maskine til med to indbyrdes aksialt forskydelige glideforskallingsformparter af stoebe hule legemer, isaer betonroer
DK71191D0 (da) * 1991-04-19 1991-04-19 Pedershaab Maskinfabrik As Maskine til med to indbyrdes aksialt forskydelige formparter at stoebe hule legemer, isaer betonroer
GB2297939A (en) * 1995-02-17 1996-08-21 Bredero Price Services Pipe Coating Apparatus
CN110181680A (zh) * 2019-05-22 2019-08-30 上海市政工程设计研究总院（集团）有限公司 一种预制大直径防腐钢筋混凝土复合管道制作方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE882667C (de) * 1951-07-01 1953-07-09 Ludwig Dipl-Ing Boelkow Vorrichtung zum Formen zylindrischer Hohlkoerper
FR1365724A (fr) * 1963-08-01 1964-07-03 Procédé pour la fabrication de tuyaux en béton, en particulier en béton de ciment et appareillage pour sa mise en oeuvre
DE3805720A1 (de) * 1988-02-24 1989-09-07 Prinzing Georg Gmbh Co Kg Verfahren zum herstellen von betonteilen und einrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
IT1230976B (it) 1991-11-08
DE69004015T2 (de) 1994-05-05
ES2047761T3 (es) 1994-03-01
IT8921074A0 (it) 1989-07-03
DE69004015D1 (de) 1993-11-25
EP0406612A1 (de) 1991-01-09

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