WO1992018307A1 - Machine de coulage d'objets creux, notamment les tuyaux en beton, comportant deux elements de moulage montes mobiles l'un par rapport a l'autre dans le sens axial - Google Patents

Machine de coulage d'objets creux, notamment les tuyaux en beton, comportant deux elements de moulage montes mobiles l'un par rapport a l'autre dans le sens axial Download PDF

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Publication number
WO1992018307A1
WO1992018307A1 PCT/DK1992/000126 DK9200126W WO9218307A1 WO 1992018307 A1 WO1992018307 A1 WO 1992018307A1 DK 9200126 W DK9200126 W DK 9200126W WO 9218307 A1 WO9218307 A1 WO 9218307A1
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WO
WIPO (PCT)
Prior art keywords
concrete
machine according
section
mould part
machine
Prior art date
Application number
PCT/DK1992/000126
Other languages
English (en)
Inventor
Bent Herrmann
Original Assignee
Pedershaab A/S
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 Pedershaab A/S filed Critical Pedershaab A/S
Publication of WO1992018307A1 publication Critical patent/WO1992018307A1/fr

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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
    • B28B21/92—Methods or apparatus for treating or reshaping
    • B28B21/94—Methods or apparatus for treating or reshaping for impregnating or coating by applying liquids or semi-liquids
    • 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
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/0063—Control arrangements
    • B28B17/0081—Process control
    • 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
    • B28B21/22—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts
    • B28B21/24—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts using compacting heads, rollers, or the like
    • B28B21/26—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts using compacting heads, rollers, or the like with a packer head serving as a sliding mould or provided with guiding means for feeding the material
    • 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
    • B28B21/22—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts
    • B28B21/24—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts using compacting heads, rollers, or the like
    • B28B21/28—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts using compacting heads, rollers, or the like combined with vibration means

Definitions

  • the invention concerns a machine for casting hollow objects, in particular pipes of concrete or a similar material, substantially vertically by means of successively progressive zonewise vibration compression, comprising inner and outer mould parts, respectively, which are displaced axially with respect to each other during the casting process.
  • the vibrator is positioned right at the top of the inner mould part, and the two mould parts are displaced axially with respect to each other during casting.
  • This displacement can take place e.g. in that the outer mould part is stationary, while the inner mould part continuously rises from below up into the outer mould part, while mould is simul ⁇ taneously successively filled with so much fresh concrete that a specific layer of concrete is constantly disposed around the area of the top of the mould part where the vibrator is present.
  • This layer which moves upwardly in the mould together with the rise of the inner mould part, will substantially be in the same state of vibration in all the levels of the mould and will moreover be vibrated for the same period of time, so that the vibration compression process can be controlled better and the finished pipe can have a more uniform quality in the longitudinal direction.
  • the object of the invention is to provide a machine of the type mentioned in the opening paragraph, which, with a minimum energy consumption for the vibration compression process, is capable of casting hollow objects, in parti ⁇ cular concrete pipes, with a well-defined higher and more uniform quality throughout the longitudinal direction than known before.
  • the machine of the invention which is novel and unique in that the inner mould part is divided into at least two sections which are interconnected via one ore more elastic spacers, and which are adapted to rotate with respect to each other, the lowermost section being firmly or rotatably fixed in a stationary or axially displaceable part of the machine, the uppermost section containing at least one vibrator.
  • This structure provides the advantage that the lowermost section of the inner mould part does not participate in the vibration of the concrete, but instead serves to quietly support the not yet set, deposited concrete. Since it is moreover now just the relatively small mass of an axially narrow zone around the position of the vibrator in the uppermost section which is now affected by the vibration forces, the energy supply to the system can be reduced drastically with respect to the conventional technique, whereby the amount of energy lost in the form of heat and noise in the outer mould part is reduced correspondingly.
  • the vibrations entail that the concrete is brought into a form of liquid compressible state.
  • the volume of the concrete is reduced during the compression, and in the prior art this causes vertical transport of material to take place in the ring gap between the two mould parts, so that filling of the mould and the compression of the concrete are impeded significantly because of the friction between the concrete and the mould parts.
  • the uppermost section of the inner mould part has an upper conical portion with a conicity which downwardly narrows the cross sectional area of the ring gap between the conical portion and the inner side of the outer mould part in a proportion which is substantially inversely propor ⁇ tional to the increase in density which the compression simultaneously imparts to the concrete during the relative axial displacement between the two mould parts.
  • Compression of the concrete requires that the concrete is loaded with a suitable static pressure, which conventio ⁇ nally just consists of the weight of the overlying column of concrete.
  • a suitable static pressure which conventio ⁇ nally just consists of the weight of the overlying column of concrete.
  • loading of the narrow vibration zone, which does not have any greater amount of concrete disposed thereover is relatively small, and, according to the invention, the conical portion of the upper section is therefore equipped with a generally multi-thread screw, which serves to transport the concrete downwardly and to simultaneously apply to the concrete a predetermined down ⁇ wardly directed static pressure during the compression process, which can thus be controlled optimally by means of a suitable selection of the pitch of the convolutions and the speed of rotation of the uppermost section.
  • a profile ring is usually employed, having the same nominal inside diameter as the pipe.
  • the convolu ⁇ tions are dimensioned with an outside diameter which is throughout at least slightly smaller than the inside diameter of the profile ring opening, so that the upper ⁇ most section can pass upwardly through this opening during the final phase of the casting.
  • the uppermost section of the inner mould part moreover has a cylindrical portion which is in continuation of the conical portion, and which, during the rotation of the uppermost section, acts as a trowel that smooths the concrete and imparts a tight and smooth inside surface to the finished pipe.
  • a rotating vibrator is used, imparting rotating horizontal vibrations to the uppermost section.
  • another type of vibrator is used, imparting horizontal vibrations to the uppermost section with directions of deflection which lie in a predetermined fixed plane through the axis of the section. This additionally reduces the amount of concrete which vibrates, and since the deflection plane follows the rotation of the section it is simultaneously ensured that the concrete is vibration-compressed completely uniformly around the periphery of the pipe.
  • the vibration compression process can be optimized by adjusting one or more of the parameters comprising the relative displacement speed between the mould parts, the rotational speed of the uppermost section and the vibration frequency and/or vibration amplitude.
  • fig. 1 schematically shows how casting of a concrete pipe takes place by means of a traditional arrangement with inner and outer stationary mould parts
  • fig. 2 shows a concrete pipe which is being cast, with a displaceable inner mould part successively rising into the outer mould part as the mould is filled with concrete
  • fig. 3 shows the same, but with the inner mould part now replaced by an inner mould part which is divided into two separate sections by means of an elastic spacer,
  • figs. 4-8 are partial axial views of various stages in the casting of a concrete pipe by means of a machine according to the invention.
  • fig. 9 is an axial section through the top of the inner mould part shown in figs. 4-8,
  • fig. 10 is a side view of the top of a rotating inner mould part according to the invention with incorporated sensor
  • fig. 11 shows the same, but in a partial axial section, where the sensor is clearly visible
  • fig- 12 is a side view of the top of an inner mould part according to the invention with the outer wall partly removed so that a pipe connection to a surface improving material is visible, and
  • fig. 13 shows the same, but in a partial axial section.
  • Fig. 1 shows the principle of a traditional arrangement for casting concrete pipes with an inner mould part 1 and an outer mould part 2, both of which are stationary during casting.
  • the arrangement moreover comprises a bottom ring 3, which supports the concrete pipe 5 and also the outer mould part 2 in the shown case. Further, a profile ring for shaping the spigot end of the pipe is provided up ⁇ wardly in the arrangement.
  • the mould is com- pletely filled with concrete, following which the finished pipe is now ready for demoulding, which can take place in various ways.
  • the inner mould part which is fixed on an axially displaceable machine part 6, can be pulled out of the pipe by lowering the machine part 6, following which the outer mould part and the bottom ring 3, which is fixed on a table 7, together with the cast pipe are driven out to the curing site where the outer mould part is then removed.
  • the outer mould part is removed directly in the machine before the pipe standing on the bottom ring 3 is driven out to the curing site.
  • the mould parts are stationary during the actual casting, and the vibrations take place everywhere in the concrete, as indicated by its signature symbolizing the vibration state, which entails that the overall system of concrete, mould parts and mechanical fixing parts is vibrated as one great overall mass with the consequent drawbacks.
  • the arrangement shown in fig. 2 corresponds to the one described above and shown in fig. 1, except that there is just one vibrator (not shown) right at the top of the inner mould part 8, and that this now rises successively in the outer mould part 9 as the concrete 10 is filled into the mould from above. As symbolically indicated by the signature of the concrete, the concrete is then vibrated particularly intensively in a layer around the top, such that the concrete goes through the same process in the various levels of the mould as they are passed by the top of the inner mould part. With respect to the traditional method with stationary mould parts mentioned above with reference to fig.
  • the finished pipes there- fore obtain a more uniform quality in the longitudinal direction in this case, but since the vibrations inevitably propagate from the top down through the inner mould part, the process will still vary to a certain degree with the level of the concrete in the mould, and the finished pipes can therefore still not be cast with a satisfactory uniform quality in the longitudinal direction.
  • Fig. 3 shows an arrangement according to the invention with an inner mould part 11, which, like in fig. 2, rises in the outer mould part 12.
  • the inner mould part 11 is now divided into an upper section 13 and a lower section 14 via an elastic spacer 15, which may e.g. be of rubber or a similar material.
  • the vibrator (not shown) is positioned at the top of the inner mould part, viz. the upper section 13, but elastically isolated with respect to the lower section 14, which therefore does not participate in the vibration of the concrete 16, but, on the contrary, serves as a support for the deposited and not yet set concrete which is kept at rest in this manner against outer impacts.
  • the upper section 13 is provided with an upper conical portion 19 whose conicity is adapted such that the cross sectional area of the ring gap is narrowed downwardly in a proportion which is inversely proportional to the increase in density which the compression simul ⁇ taneously imparts to the concrete during the relative axial displacement between the two mould parts.
  • the concrete For the compression to take place, the concrete, as ex ⁇ plained above, must be brought into a liquid state by the vibrations, and the concrete must be affected by a verti- cal static pressure which is usually provided by the weight of the overlying column 18 of concrete.
  • a verti- cal static pressure which is usually provided by the weight of the overlying column 18 of concrete.
  • the concrete column positioned above the narrow vibration zone is rela ⁇ tively low, and the static pressure on the concrete is therefore small and varies greatly with just small changes in the filling rate.
  • the upper section 13 is therefore adapted such that it is caused to rotate during casting by means of a drive assembly (not shown), and the conical portion 19 of the section is moreover provided with preferably several convolutions which, at a specific speed of rotation, apply to the concrete a predetermined down ⁇ wardly directed pressure which is considerably greater than the pressure from the overlying concrete column.
  • This pressure can be regulated by changing the speed of rotation and by means of a suitable selection of the pitch of the convolutions. It has been found that the optimum pressure impact on the concrete can be obtained best when this pitch is relatively small and when there are several convolutions which together form a multi- hread screw.
  • the conical portion 19 of the upper section 13 downwardly merges into a cylindrical portion 21, which serves as a trowel smoothing the surface of the concrete during the rotation of the section 13.
  • the cylindrical portion 21 also serves to calibrate the inside diameter of the cast concrete pipe, after the compression process at the conical portion 19 has been completed. If the height of the cylindrical portion is too low, the calibration will be incomplete, since it can then partly take place in the transition zone to the not yet finish-compressed concrete, and if the cylindrical portion is too high, too great friction forces can easily occur between the portion and the concrete, which is thereby affected by a torque, which can entail deformation in the pipe.
  • the best solution to these conflicting conditions is that the height of the cylindrical portion is between 0.1-1.0, preferably between 0.3-0.7 and in particular between 0.4-0.6 times the diameter of the portion.
  • Figs. 4-8 show various stages in the casting of a concrete Pips by means of a machine according to the invention.
  • the machine which is only shown in part, corresponds to the machine shown in fig. 3, and the same reference numerals are used. Further, the machine may be of any type, pro ⁇ vided that it can retain and guide the mould parts as shown and described in the present patent application.
  • the uppermost end part of the outer mould part 12 is shaped as a filling hopper 22, which downwardly merges into the profile ring 4, which is thus firmly connected with the outer mould part.
  • Above the filling hopper 22 there is moreover provided a conveyer belt 23 for filling the mould with fresh concrete in a manner known per se at the desired rate.
  • the bottom ring 3, which carries the weight of the concrete, rests on a support ring or support leg 24, which in turn rests on a number of rubber buffers 25 for preventing the vibrations in the concrete from propagating to the table 7.
  • the casting process is in the initial phase, where the inner mould part 11 is raised precisely so much that the cylindrical portion 21 of the upper section 13 closes the central opening in the bottom ring 3.
  • the spigot end of concrete pipes is normally formed by means of a profile ring which is independent of the outer mould part, and which is finally pressed down against the spigot end during casting to provide the necessary static pressure for compressing the concrete at the spigot end.
  • This, how ⁇ ever, is possible by means of the arrangement shown in figs. 4-8, since the profile ring 4 is now firmly connected with the outer mould part 12, and the distance between the end faces of the pipe therefore constitutes a fixed quantity.
  • the vibrator (not shown) is kept in continuous operation and thereby emits the vibrations shown by the symbol 26. Then the vibrator is stopped and the demoulding operation begins, the inner mould part 11, as shown in fig. 8, being again lowered to be withdrawn completely from the finished concrete pipe, which now has such a stable shape because of the compression that it can carry itself without support from the mould parts.
  • the excess of concrete which is disposed in the filling hopper 22, and which therefore does not drop out; even though the inner mould part is lowered and no longer supports the excess of concrete.
  • the concrete residue will be entrained by the fresh concrete and used together with it.
  • the upper section 13 of the inner mould part 11 must be capable of passing the central opening of the profile ring 4, and the convolutions 20 of the conical portion 19 therefore have an outside diameter which is sligthly smaller than the diameter of this opening.
  • the outer mould part may be removed in a variety of ways known per se, which e.g. comprise driving the mould part with the finished pipe to the curing site and removing it here, or lifting the filling hopper and the outer mould part clear of the cast pipe in the actual machine, but separately.
  • the filling hopper and the outer mould part are intregal, as mentioned before, and, after the conveyer belt 23 has been pulled out to the side, they are lifted as a body clear of the finished pipe, which now has such a stable shape that it can be driven to the curing site without support. However, during this transport and until the pipe has cured, it remains standing on the bottom ring 3.
  • the inner mould part 11 may be firmly or rotatably fixed on the axially upwardly and downwardly displaceable machine part 6. It has been found that the inner mould part can more easily be moved up and down in the deposited concrete when its lower section 14 simultaneously rotates quite slowly. In that case the upper and lower section 13, 14 are caused to rotate in separate directions for the resulting torsional moment, which affects the concrete, to be as small as possible. In an advantageous embodiment of the machine the inner and outer mould parts 11, 12 are moreover displaced in counter phase during demoulding, so that the tensile forces, to which the cast, but not yet set pipe are subjected, substantially neutralize each other.
  • Fig. 9 is a fragmentary view of the uppermost part of the inner mould part 11 shown in figs. 4-8 with the upper section 13 and the lower section 14.
  • the mould part is built as a plate structure
  • the spacer 15 is a ring consisting of rubber or another suitable elastic material.
  • the ring which is positioned in recesses in the sections 13, 14 and keep these mutually spaced, can rotate freely with respect to at least one of the sections by means of a slip means, and the outer side of the ring is flush with the outer side of both sections.
  • the ring ensures that no noticeable vibrations are trans ⁇ mitted from the upper to the lower section 13, 14.
  • a rotating vibrator 27 with swing bodies 28 is incorporated in the upper section 13.
  • This vibrator 27 may be of any structure and will therefore not be described more fully here.
  • the vibrator is caused to rotate by means of a drive assembly (not shown) via a vertical shaft 29 and an elastic coupling 30, preventing the vibrations from the vibrator 27 from propagating to the shaft 29 and from there further on to the rest of the mould system.
  • the vibrator 27 is positioned in a sleeve 31, which is in turn connected with the outer wall in the upper section 13 of the mould part by means of two ring-shaped plates 32a, 32b. Further, the sleeve 31 is downwardly fixed on a ring- shaped plate 33 with bolts 34.
  • This ring-shaped plate 33 is in turn fixed to an underlying flange 36 with bolts 37, the ring-shaped plate 33 and the flange 36 being kept mutually spaced by a plurality of rubber buffers 35 serving to prevent the vibrations from the vibrator 27 from being transmitted to the flange 36 and from there further on to the rest of the mould system.
  • This is thus completely vibration-insulated from the upper section 13 by means of the rubber ring 15, the elastic coupling 30 and the rubber buffers 35.
  • the flange 36 is rotatably journalled with a ball bearing 39 in a vertical stationary pipe 40, which is fixed on the machine part (not shown) which serves to raise and lower the entire inner mould part during the casting process.
  • the flange is moreover welded to a vertically downwardly extending pipe 38, which can be caused to rotate by means of a drive assembly (not shown) arranged downwardly in the inner mould part or directly below it.
  • the vibrator 27 rotates continuously during the actual casting process, and the upper section 13 simultaneously rotates in the same or the opposite direction.
  • the vibrations take place with a frequency of between 50 and 250 Hz, and the upper section 13 rotates at a rate of up to 200 rotations per minute.
  • the optimum vibration compression conditions which are capable of keeping the density of the concrete at the desired level during the entire casting process, can be provided by adjusting one or more of the parameters, the relative speed of displacement between the mould parts, the speed of rotation of the uppermost section, as well as the frequency and/or amplitude of the vibrations. These parameters are controlled by preprogrammed computer in response to the signals from a sensor 41, which is positioned in the upper section 13, as shown in figs. 10 and 11.
  • the sensor may e.g. be adapted to measure the rate of an ultrasonic pulse during the passage to and fro through the wall of the cast pipe to the inner side of the outer mould part 12 (fig.
  • the sensor system is then to be constructed as a transceiver system measuring the time delay of the reflected signal from the outer mould part.
  • the sensor 41 describes a screw line because of the rotation of the upper section 13 and the rise of the inner mould part 11.
  • the wall of the cast concrete pipe is hereby inspected completely in its entire extent, and the mentioned ultrasound rate can be used as a measure of the quality of the compression by comparison with reference values known in advance, and the quality of the compression can thus not only be registered passively, but also be controlled actively if desired.
  • ultrasound sensors may be use, but also other suitable forms of sensors, e.g. X-ray sensors.
  • Figs. 12 and 13 show a pipe connection 43 which terminates in an outlet opening 42 in the upper section 13.
  • the pipe connection 43 is connected with a reservoir (not shown) of a surface improving material, which can thereby be con- veyed to the outlet opening 42 by means of e.g. a pump (not shown).
  • a surface improving material which can thereby be con- veyed to the outlet opening 42 by means of e.g. a pump (not shown).
  • a surface improving material may be fine concrete or plastics which settles as a thin layer on top of the concrete, or e.g. just water which brings the outermost surface of the concrete into a liquid state which can easily be smoothed to an even and tight layer.
  • the machine of the invention now makes it possible to cast a concrete pipe with a well-defined high and uniform quality throughout the longitudinal direction and with a reduced energy con ⁇ sumption and transmission of less trying noise than known before.
  • the pro ⁇ cess is moreover self-adjusting, such that a uniform quality is ensured from pipe to pipe in series of a desired size.
  • the process can easily and quickly be switched from one quality to another by changing the production parameters via the control system.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Automation & Control Theory (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

Machine servant au coulage sensiblement vertical de tuyaux en béton à l'aide d'une compression vibratoire à progression successive par zones. La machine comporte des éléments intérieur et extérieur de moulage (11, 12) aptes à se déplacer l'un par rapport à l'autre dans le sens axial pendant le processus de coulage. L'élément intérieur (11) est composé d'au moins deux sections (13, 14) reliées l'une par rapport à l'autre par l'intermédiaire d'une ou plusieurs pièces d'écartement élastiques (15), et aptes à tourner l'une par rapport à l'autre. Par ailleurs, la section inférieure (14) est montée fixe ou rotative dans une partie immobile ou axialement coulissante de la machine. En outre, la partie conique (19) est dotée d'une vis à filetage multiple (20) destinée à comprimer le béton vibré. Grâce à cette structure, on peut désormais couler, par exemple, des tuyaux en béton présentant une qualité bien définie, supérieure et plus uniforme dans le sens longitudinal tout en réduisant la consommation d'énergie et les bruits gênants davantage qu'il n'a été possible de le faire auparavant avec les machines traditionnelles de ce type.
PCT/DK1992/000126 1991-04-19 1992-04-15 Machine de coulage d'objets creux, notamment les tuyaux en beton, comportant deux elements de moulage montes mobiles l'un par rapport a l'autre dans le sens axial WO1992018307A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK71191A DK71191D0 (da) 1991-04-19 1991-04-19 Maskine til med to indbyrdes aksialt forskydelige formparter at stoebe hule legemer, isaer betonroer
DK0711/91 1991-04-19

Publications (1)

Publication Number Publication Date
WO1992018307A1 true WO1992018307A1 (fr) 1992-10-29

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PCT/DK1992/000126 WO1992018307A1 (fr) 1991-04-19 1992-04-15 Machine de coulage d'objets creux, notamment les tuyaux en beton, comportant deux elements de moulage montes mobiles l'un par rapport a l'autre dans le sens axial

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AU (1) AU1689092A (fr)
DK (1) DK71191D0 (fr)
WO (1) WO1992018307A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589196A1 (fr) * 1992-08-17 1994-03-30 Ed. Züblin Aktiengesellschaft Dispositif pour la fabrication de tuyaux en béton
EP0990497A2 (fr) * 1991-04-19 2000-04-05 Pedershaab A/S Machine pour le coulage vertical de tuyaux en béton ou en un matériau similaire dans un système de moulage possédant une roue distributrice

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Publication number Priority date Publication date Assignee Title
DK28454C (da) * 1920-05-18 1921-09-19 Cementroersfabrikanterne W A C Maskine til Fremstilling af Cementrør.
US1813772A (en) * 1930-03-24 1931-07-07 Zeidler Concrete Products Mach Machine for constructing concrete pipe
FR878738A (fr) * 1941-09-19 1943-01-28 Procédé et dispositifs pour la fabrication de tuyaux en matières agglomérées, telles que du béton
DE882667C (de) * 1951-07-01 1953-07-09 Ludwig Dipl-Ing Boelkow Vorrichtung zum Formen zylindrischer Hohlkoerper
DE2513032A1 (de) * 1975-03-25 1976-10-07 Omag Maschinenbau Ag Vorrichtung zum verdichten von beton oder aehnlichen massen zur herstellung von hohlkoerpern, vorzugsweise rohren, exakter laenge
EP0329856A2 (fr) * 1988-02-24 1989-08-30 Georg Prinzing GmbH & Co. KG Betonformen- und Maschinenfabrik Dispositif pour la fabrication d'éléments en béton
EP0388347A2 (fr) * 1989-03-13 1990-09-19 International Pipe Machinery Corporation Machine pour la fabrication de tuyaux en ciment
EP0406612A1 (fr) * 1989-07-03 1991-01-09 CROCI MARIO & FIGLI S.r.l. Procédé et dispositif de fabrication de tuyaux en béton renforcé

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK28454C (da) * 1920-05-18 1921-09-19 Cementroersfabrikanterne W A C Maskine til Fremstilling af Cementrør.
US1813772A (en) * 1930-03-24 1931-07-07 Zeidler Concrete Products Mach Machine for constructing concrete pipe
FR878738A (fr) * 1941-09-19 1943-01-28 Procédé et dispositifs pour la fabrication de tuyaux en matières agglomérées, telles que du béton
DE882667C (de) * 1951-07-01 1953-07-09 Ludwig Dipl-Ing Boelkow Vorrichtung zum Formen zylindrischer Hohlkoerper
DE2513032A1 (de) * 1975-03-25 1976-10-07 Omag Maschinenbau Ag Vorrichtung zum verdichten von beton oder aehnlichen massen zur herstellung von hohlkoerpern, vorzugsweise rohren, exakter laenge
EP0329856A2 (fr) * 1988-02-24 1989-08-30 Georg Prinzing GmbH & Co. KG Betonformen- und Maschinenfabrik Dispositif pour la fabrication d'éléments en béton
EP0388347A2 (fr) * 1989-03-13 1990-09-19 International Pipe Machinery Corporation Machine pour la fabrication de tuyaux en ciment
EP0406612A1 (fr) * 1989-07-03 1991-01-09 CROCI MARIO & FIGLI S.r.l. Procédé et dispositif de fabrication de tuyaux en béton renforcé

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Title
DERWENT'S ABSTRACT, No. L35 93 B/49; & SU,A,651 960, publ. week 7949, (CONS ROAD ENG RES). *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0990497A2 (fr) * 1991-04-19 2000-04-05 Pedershaab A/S Machine pour le coulage vertical de tuyaux en béton ou en un matériau similaire dans un système de moulage possédant une roue distributrice
EP0990497A3 (fr) * 1991-04-19 2000-05-10 Pedershaab A/S Machine pour le coulage vertical de tuyaux en béton ou en un matériau similaire dans un système de moulage possédant une roue distributrice
EP0589196A1 (fr) * 1992-08-17 1994-03-30 Ed. Züblin Aktiengesellschaft Dispositif pour la fabrication de tuyaux en béton

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AU1689092A (en) 1992-11-17
DK71191D0 (da) 1991-04-19

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