EP0499572A1 - Verfahren und Vorrichtung zum Schneiden eines Faserstranges zum Fasern und Dosieren den letzteren in eine Betonmischung - Google Patents

Verfahren und Vorrichtung zum Schneiden eines Faserstranges zum Fasern und Dosieren den letzteren in eine Betonmischung Download PDF

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Publication number
EP0499572A1
EP0499572A1 EP92610009A EP92610009A EP0499572A1 EP 0499572 A1 EP0499572 A1 EP 0499572A1 EP 92610009 A EP92610009 A EP 92610009A EP 92610009 A EP92610009 A EP 92610009A EP 0499572 A1 EP0499572 A1 EP 0499572A1
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EP
European Patent Office
Prior art keywords
fibre
string
concrete
concrete mixer
cutter
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.)
Granted
Application number
EP92610009A
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English (en)
French (fr)
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EP0499572B1 (de
Inventor
Iwer Dall
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.)
Skako AS
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Skako AS
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Publication date
Application filed by Skako AS filed Critical Skako AS
Publication of EP0499572A1 publication Critical patent/EP0499572A1/de
Application granted granted Critical
Publication of EP0499572B1 publication Critical patent/EP0499572B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/404—Pre-treatment of fibres

Definitions

  • the invention relates to a method of adding to a concrete mixture a desired quantity of fibre cuts of e.g. plastic, and the mixing process comprises dosing aggregates in the form of sand and stone, as well as dry mixing, dosing cement and additives under continued dry mixing, dosing additives and water, as well as wet mixing, and discharging the finished concrete mixture, whereby fibre string is advanced by means of a feed mechanism to a cutter for cutting the string into predetermined lengths which are fed to a concrete mixer with the concrete mixture.
  • fibres of various kinds have for many years advantageously been used to increase the tensile strength of concrete.
  • the fibres are of plastic, e.g. polypropylene, there are additionally obtained other significant advantages.
  • the plastic fibres thus prevent visible shrinkage cracks by limiting the development of micro-cracks.
  • concrete normally undergoes a volume reduction causing formation of micro-cracks.
  • the presence of the plastic fibres entails that this crack-formation is counteracted, and that the concrete develops its full potential strength and impermeability.
  • the fibres change the intrinsic structure of the concrete, and a crack-free product is obtained which does not call for provision of traditional shrinkage reinforcement nets.
  • the fibres In the high-dosing area, where 10-20 kg fibres/m3 cement bound material are added, the fibres additionally impart a decided reinforcing effect to the material, whereby its tensile strength, tenacity and energy of rupture are significantly increased.
  • the fibre reinforced object When the fibre reinforced object is loaded in excess of the bearing capacity of the unreinforced material, countless evenly distributed stable micro-cracks are formed, but the presence of the fibres entails that this crack-formation does not lead to fracture until at a significantly higher load.
  • the even distribution of the micro-cracks necessary for obtaining the above advantageous properties is, however, contingent on a correspondingly even distribution of the plastic fibres.
  • These fibres have very small density as compared with e.g. the aggregates stone and sand, and besides, the fibres take up negligible space in comparison with the total concrete mass. Consequently, it has been extremely difficult to achieve a sufficiently even distribution of the fibres by means of the commonly used dosing method where the fibres are merely batch-wise poured manually into the concrete mixture.
  • the novel and characteristic feature of the method according to the invention is that the fibre cut is fed into the concrete mixer during the dry mixing. This ensures that the fibres already during the dosing proper become evenly distributed in the material, since the latter successively under simultaneously mixing passes under the area or areas at the surface of the concrete mixture where the fibres are added, and that the fibres are not hereby bound by moisture to the aggregates, but on the contrary can move freely in relation thereto.
  • the fibre flow to the concrete mixer is advantageously controlled by controlling the feeding speed of the fibre string, since this speed is sensed by means of a sensor which gives off to a programmed control unit a signal representing the feeding speed, which is thereby again controlled by the control unit.
  • the invention also relates to an apparatus for adding to a concrete mixture a desired quantity of fibre cut e.g. of plastic, and comprising an aggregate silo, a cement silo, an additive silo and a water silo or similar water supply, as well as a concrete mixer, and additionally a supply of fibre string, a feed mechanism for the said fibre string and a cutter for cutting the fibre string into predetermined lengths.
  • the plant according to the invention further comprises at least one sensor for sensing the feed speed of the fibre string and a programmed control unit for regulating in dependence of the signal from the said sensor the feeding speed, so that the desired quantity of fibre cut is added to the concrete mixture in an even flow during the dry mixing.
  • the cutter is positioned at a level above the mixer, whereby the fibre cut by itself in finely distributed form sifts down into the mixer through an air duct.
  • this duct there is a gate which normally bars communication from the concrete mixer up to the cutter, which is hereby spared attacks by dust and moisture which could otherwise rise through the air duct and attack the cutter. The gate is then only opened when the desired quantity of fibre cuts is to be added to the mixture.
  • the cutter can be positioned above a conveyor or an air duct between the cutting machine and the mixer. This allows the cutting proper to take place at some distance from the mixing process, which may often be advantageous.
  • the cutting of the fibre string and a supply thereof may e.g. be placed in another room or in another storey.
  • the fibre string proper is normally wound into spools which in a suitable number are placed in a magazine from where the cutter itself normally fetches the strings.
  • the apparatus may comprise at least two exchangeable magazines, so that one can be filled while the other operates.
  • the concrete mixer may be connected to several complete apparatus which are used in turn.
  • the invention also relates to an apparatus for adding to a concrete mixture a desired quantity of fibre cuts e.g. of plastic.
  • This apparatus comprises a concrete mixer, a magazine for storing a supply of fibre string, a feed mechanism for advancing the fibre string during a predetermined period of each mixing cycle, a cutter for during this period successively cutting the fibre string into predetermined lengths, and a conveyor for feeding these lengths to the concrete mixer in an even flow.
  • the apparatus additionally comprises a sensor for sensing the feeding speed of the fibre string and a control unit for regulating in dependence of the signal from the sensor the feeding speed, so that the desired quantity of fibre cuts is added to the mixture in the desired even flow.
  • Fig. 1 shows a complete apparatus for mixing concrete and adding a predetermined fibre cut portion to the mixture.
  • the raw materials used for this mixture are in this case stored in four silos which in order of succession from the left is a cement silo 1, an additive silo 2, a water silo 3 and an aggregate silo 4.
  • These siloes which are all of conventional kind, are each closable by a gate, and are furthermore each separate one connected to a concrete mixer 5 via pipe conduits which in the figure are merely indicated by a dotted line.
  • the concrete mixer is further connected to a cutting arrangement which in its entirety is designated by the reference numeral 6 and which serves to cut fibre string into fibre cut and feed the latter to the concrete mixer in the manner further described in the following.
  • Fig. 2 shows, partly in section, the cutting arrangement 6 shown in fig. 1 in a larger scale, and the same arrangement is also shown schematically in fig. 3.
  • the complete arrangement is, as best seen from fig. 2, positioned in a closed cabinet 7, which via an air duct 8 is connected to the concrete mixer 5, of which only a segment is shown.
  • the arrangement comprises a cutter 9, consisting of a press roller 10 and a cutter head 11.
  • Fig. 4 shows a segment of this cutter in a larger scale in the process of cutting a fibre string 12 to fibre cuts.
  • the fibre string 12 is wound a couple of turns around a row of radially positioned knives 12 positioned in equally spaced relationship along the periphery of the cutter head 11.
  • the press roller 10 is urged with a suitable pressure against the cutter head 11, whereby the immermost one of the turns of the fibre string is cut through by the knives 13 and drops down between the latter as fibre cut 14. Since the fibre string 12, as mentioned, has been wound several turns around the cutter head 11 the latter will itself automatically attract the fibre string in step with the cutting up.
  • the cutter 9, as shown in fig. 2 and 3, is simultaneously provided with several strings at a time. These strings have been wound into a number of spools 15 accomodated in a magazine 16 which is part of the complete cutting arrangement 6. From the spools 15 the fibre strings have been passed e.g. through eyes 17 (fig. 3) or over reels 18 (fig. 2) for guiding the strings on their way to the cutter 9, which, as mentioned, by itself attracts the strings as needed. In the air duct 8 there is a gate 19 which is opened by dosing, but is normally closed to prevent moisture and dust from the mixing process from rising and damaging the cutter 9 or other parts of the cutting arrangement 6. Sensors 20 serve to sense the feeding speed of the fibre strings.
  • the concrete mixer 5 When the concrete is to be mixed, the concrete mixer 5 is first supplied with the prescribed quantity of aggregates in the form normally of stone and sand from the silo 4, a dry mixing hereby taking place, whereafter the cement from the silo 1 is dosed under continued dry mixing. Finally, additives and water from the silos 2 and 3, respectively, are added, and after wet mixing of the entire concrete mixture it is now ready for discharge from the concrete mixer 5.
  • plastic fibres is capable of considerably improving the material properties of the finished concrete i.a. by distributing any crack-formations into a finely meshed net of unharmful micro-cracks.
  • the precondition for optimal exploitation of this effect is, however, precisely that the fibres are distributed very evenly in the concrete mixture. Is this not so, the finished concrete will easily become inhomogeneous. In some areas the concrete will thus not have attained the prescribed improvements of the material properties due to lack of fibres, whereas other areas where the fibres lie too close, have become directly weakened, since the fibres in more or less coherent quantities form interfaces which are incapable of transferring tensile forces in the finished concrete construction.
  • the fibres are advantageously added during the dry mixing which treats the largest amount of materials, and during which the material still has a comparatively loose and easily workable structure.
  • the short time available during this mixing and which lies within the range about 1/4 - 1 1/2 min, it is important that the plastic fibres get into contact with as much of the concrete mixture as possible immediately during the dosing proper if a satisfactorily uniform distribution of the fibres in the mixture is to be achieved.
  • the fibres When first the fibres have been worked into the mixture they can as a result of their lightness and relatively large surface only with difficulty be displaced relatively to the far heavier content of stone and sand in the mixture.
  • the fibres are thus according to the invention added in an even and constant flow over a period which, as mentioned, advantageously may span most of the dry mixing period.
  • all parts of the concrete mixture will as a result of the mixing process little by little pass under the zone in which of the fibres fall down into the concrete mixer, and in this way at once become intimately distributed throughout the entire concrete mass.
  • this is e.g. achieved during the dry mixing period by advancing the fibre strings at a constant speed which precisely corresponds to the desired quantity of fibre cut per time unit.
  • the speed is sensed by means of the sensors 20 which give off signal to a programmed control unit (not shown).
  • This control unit may be equipped with a keyboard for coding in the data and desired material properties of the various mixtures, whereafter the control unit by means of its program automatically readjusts the number of revolutions of the cutter head 13, so that the cutter advances the fibre strings 12 at correct speed and cuts them into predetemined lengths which in the course of the dry mixing period sift down into the concrete mixture whereby they are evenly and uniformly distributed therein.
  • the cutter 9 can, as shown in figs. 1, 2, 3 and 5, be accomodated just above the concrete mixer 5, so that the fibre cut falls directly therein via the air duct 8. Because of conditions of space it may, however, sometimes be advantageous if the arrangement 6 is placed at some distance from the concrete mixer 5.
  • a belt conveyor 21 can be installed between the said mixer and the cutting arrangement 6, which conveyor conveys the fibre cut to the concrete mixer 5.
  • an air duct 22 may also be used for advancing the fibre cut, through which duct the fibre cut is blown by means of a blower 23.
  • the cutting arrangement 6 may e.g. be positioned in another storey also accomodating the supply of fibre string spools.
  • Fig. 8 is a top view of the complete apparatus provided with only one cutting arrangement 6.
  • the apparatus can advantageously also be equipped with exchangeable magazines 16 which are filled when they are not coupled to the cutter.
  • a magazine When a magazine is empty it can therefore quickly be replaced by a full magazine so that no time is wasted in operation when a magazine has run out of fibre string and must be supplied with fresh spools.
  • each concrete mixer may be provided with several cutting arrangements 6, as shown in fig. 10. When the arrangement used in a given moment, runs out of string, one of the other cutting arrangements, which in the meantime has been supplied with full spools, can immediately be put into operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP92610009A 1991-02-12 1992-02-11 Vorrichtung zum Schneiden eines Faserstranges in Faserstücke und Dosieren der letzteren in eine Betonmischung Expired - Lifetime EP0499572B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK234/91 1991-02-12
DK023491A DK23491D0 (da) 1991-02-12 1991-02-12 Fremgangsmaade og anlaeg til ved opklipning af fibersnor i fiberklip at dosere dette til en betonblanding

Publications (2)

Publication Number Publication Date
EP0499572A1 true EP0499572A1 (de) 1992-08-19
EP0499572B1 EP0499572B1 (de) 1997-10-08

Family

ID=8091246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92610009A Expired - Lifetime EP0499572B1 (de) 1991-02-12 1992-02-11 Vorrichtung zum Schneiden eines Faserstranges in Faserstücke und Dosieren der letzteren in eine Betonmischung

Country Status (4)

Country Link
EP (1) EP0499572B1 (de)
AT (1) ATE158977T1 (de)
DE (1) DE69222547T2 (de)
DK (1) DK23491D0 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995009723A1 (en) * 1993-10-05 1995-04-13 Confiber Ab A process for adding reinforcement fibres to cast stuff, and a device for providing and adding such fibres
US6283327B1 (en) 2000-04-12 2001-09-04 Insulation Technology Corporation Material feed system for selectively delivering lightweight, friable mesh fibers
US6550362B1 (en) 2000-10-25 2003-04-22 Si Corporation Apparatus and method for dispensing fibers into cementitious materials
WO2005018896A1 (en) * 2003-08-15 2005-03-03 Bracegirdle P E Process for producing fiber reinforced asphaltic and cementitious materials
FR2866264A1 (fr) * 2004-02-13 2005-08-19 Jean Sebille Ensemble pour le gainage des fibres, l'extraction et le dosage des fibres dans le beton ou le mortier
US6945686B2 (en) 2001-05-04 2005-09-20 Nv Bekaert Sa Method for dosing reinforcing fibres for the manufacturing of fibre concrete and the chain packing used
US6971784B1 (en) * 2002-09-06 2005-12-06 Bracegirdle Paul E Process for producing fiber reinforced hot-mix asphaltic and cementitous structural materials with fiber pellets produced from carpet waste
US7563017B1 (en) * 2002-09-06 2009-07-21 Bracegirdle Paul E Process for mixing congealable materials such as cement, asphalt, and glue with fibers from waste carpet
AT524739A1 (de) * 2021-02-01 2022-08-15 Baumit Beteiligungen Gmbh Verfahren zur Herstellung von armierten 3D-gedruckten beton- bzw. mörtelbasierten Objekten

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2008307004B2 (en) 2007-10-02 2013-08-01 Nv Bekaert Sa Assembly for reinforcement for concrete and markers
CN113414873B (zh) * 2021-06-28 2022-08-26 新兴栈(绵阳)建材有限公司 一种便于比例调和的混凝土制造设备
CN113733353A (zh) * 2021-09-17 2021-12-03 湖南岳煌建材科技有限公司 一种超耐久建筑用混凝土的生产工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH460620A (fr) * 1966-06-06 1968-07-31 Saint Gobain Procédé et installation pour l'incorporation de fibres ou fils à des liants minéraux
GB1469424A (en) * 1973-05-21 1977-04-06 Onoda Cement Co Ltd Fibre-reinforced cementitious board

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH460620A (fr) * 1966-06-06 1968-07-31 Saint Gobain Procédé et installation pour l'incorporation de fibres ou fils à des liants minéraux
GB1469424A (en) * 1973-05-21 1977-04-06 Onoda Cement Co Ltd Fibre-reinforced cementitious board

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995009723A1 (en) * 1993-10-05 1995-04-13 Confiber Ab A process for adding reinforcement fibres to cast stuff, and a device for providing and adding such fibres
US6283327B1 (en) 2000-04-12 2001-09-04 Insulation Technology Corporation Material feed system for selectively delivering lightweight, friable mesh fibers
US6550362B1 (en) 2000-10-25 2003-04-22 Si Corporation Apparatus and method for dispensing fibers into cementitious materials
US6945686B2 (en) 2001-05-04 2005-09-20 Nv Bekaert Sa Method for dosing reinforcing fibres for the manufacturing of fibre concrete and the chain packing used
US7001657B2 (en) 2001-05-04 2006-02-21 Nv Bekaert Sa Closed reinforcement fiber package, as well as chain packing consisting of such closed packages
US7674511B2 (en) 2001-05-04 2010-03-09 Nv Bekaert Sa Closed reinforcement fiber package, as well as chain packing consisting of such closed packages
US6971784B1 (en) * 2002-09-06 2005-12-06 Bracegirdle Paul E Process for producing fiber reinforced hot-mix asphaltic and cementitous structural materials with fiber pellets produced from carpet waste
US7563017B1 (en) * 2002-09-06 2009-07-21 Bracegirdle Paul E Process for mixing congealable materials such as cement, asphalt, and glue with fibers from waste carpet
WO2005018896A1 (en) * 2003-08-15 2005-03-03 Bracegirdle P E Process for producing fiber reinforced asphaltic and cementitious materials
FR2866264A1 (fr) * 2004-02-13 2005-08-19 Jean Sebille Ensemble pour le gainage des fibres, l'extraction et le dosage des fibres dans le beton ou le mortier
WO2005077763A1 (fr) * 2004-02-13 2005-08-25 Jean Sebille Dispositif et procede pour le gainage, l’extraction et le dosage des fibres dans le beton ou le mortier
AT524739A1 (de) * 2021-02-01 2022-08-15 Baumit Beteiligungen Gmbh Verfahren zur Herstellung von armierten 3D-gedruckten beton- bzw. mörtelbasierten Objekten

Also Published As

Publication number Publication date
DE69222547T2 (de) 1998-04-23
ATE158977T1 (de) 1997-10-15
DE69222547D1 (de) 1997-11-13
EP0499572B1 (de) 1997-10-08
DK23491D0 (da) 1991-02-12

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