EP0110941B1 - Procede pour le melange d'un beton contenant une matiere plastique pour la realisation d'un beton projete dans un tuyau melangeur et tuyau melangeur pour la mise en oeuvre de ce procede - Google Patents

Procede pour le melange d'un beton contenant une matiere plastique pour la realisation d'un beton projete dans un tuyau melangeur et tuyau melangeur pour la mise en oeuvre de ce procede Download PDF

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Publication number
EP0110941B1
EP0110941B1 EP83901807A EP83901807A EP0110941B1 EP 0110941 B1 EP0110941 B1 EP 0110941B1 EP 83901807 A EP83901807 A EP 83901807A EP 83901807 A EP83901807 A EP 83901807A EP 0110941 B1 EP0110941 B1 EP 0110941B1
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EP
European Patent Office
Prior art keywords
water
injection channels
mixing
mixing tube
channels
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.)
Expired
Application number
EP83901807A
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German (de)
English (en)
Other versions
EP0110941A1 (fr
Inventor
Rainer Koehne
Dieter Koehne
Heinrich Freienstein
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.)
Pressbau GmbH
Original Assignee
Pressbau GmbH
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Filing date
Publication date
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Priority claimed from DE19823220880 external-priority patent/DE3220880C2/de
Application filed by Pressbau GmbH filed Critical Pressbau GmbH
Priority to AT83901807T priority Critical patent/ATE32576T1/de
Publication of EP0110941A1 publication Critical patent/EP0110941A1/fr
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Publication of EP0110941B1 publication Critical patent/EP0110941B1/fr
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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
    • B28C5/02—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing
    • B28C5/026—Mixing guns or nozzles; Injector mixers
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00—Implements for finishing work on buildings
    • E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
    • E04F21/06—Implements for applying plaster, insulating material, or the like
    • E04F21/08—Mechanical implements
    • E04F21/12—Mechanical implements acting by gas pressure, e.g. steam pressure

Definitions

  • the invention relates to a method for mixing a plastic-containing dry sprayed concrete according to the preamble of patent claim 1 and to a mixing tube according to the preamble of patent claim 6 or 8 which is used in particular to carry out this method.
  • a mixing tube for concrete dry spraying which has two axially spaced sets of injection channels, each starting from an annular space and each having an outlet opening on the inner wall of the spray nozzle.
  • the two sets of injection channels are arranged at an axial distance from one another which is greater than half the total axial length of the mixing tube.
  • the first set of injection channels at the front in the conveying direction is intended for the supply of plastic emulsion, while the second set of injection channels is intended for the supply of water.
  • the object of the invention in terms of the process is to improve the known process for mixing a plastic-containing shotcrete in such a way that a uniform mixing of dry mixture, synthetic resin emulsion and water is achieved regardless of the respective addition amounts.
  • the object of the invention is to improve the known mixing tube in such a way that the more uniform mixing of dry mixture, synthetic resin emulsion and water is achieved.
  • the invention it is possible to achieve thorough mixing regardless of the amount of water or amount of synthetic resin emulsion added.
  • the negative impact on the mixing result of water pressure and water quantity or pressure of the synthetic resin emulsion and their quantity in the known mixing method or the known mixing tube is excluded because the mixing of water and synthetic resin emulsion takes place in advance and the mixing of this mixture with the dry mixture mainly through which compressed air is reached.
  • the liquid mixture is entrained by the compressed air and transported, so to speak, that it can penetrate deep enough into the dry mixture flow and sufficient mixing is achieved.
  • the material stream mixed according to the invention is mixed more homogeneously and moistened more uniformly than the stream mixed according to the known method. In the latter, stripes are often seen laterally in the jet cone, the lower area of the jet cone is typically more thoroughly mixed than the upper area. In contrast, layers of this type cannot be seen in the method according to the invention, which indicates better mixing and more uniform moistening.
  • the application thickness to be applied in one operation is approximately 3 to 4 cm for vertical surfaces. Due to the forced and much better mixing, application thicknesses which are significantly above these values, for example 20 cm, are achieved in the method according to the invention. It is no longer necessary, as in the conventional method, to work in several layers for larger thicknesses.
  • the rebound is relatively high in the known mixing process and is known to consist mainly of aggregates, so that the rebound quantity means not only a loss of material, but also must be taken into account in the composition of the finished product, since the proportions of the individual substances in the Dry mix are different than in the applied material.
  • the rebound can be significantly reduced in the process according to the invention, it is considerably below the values given for the known process. This saves material on the one hand, but on the other hand the mixing ratio of the finished product can be specified more precisely. Due to the much better mixing of the liquid mixture and the dry mixture, the risk is avoided that material that is too dry gets onto the application surface, where it can rebound, but at least causes an unevenness in the finished spray product. Areas that are too damp and could slip or drip are also avoided.
  • the water addition can be significantly less than in the conventional process, which improves the water cement value which is decisive for the finished product. Because of the significantly improved mixing, the addition of water no longer has to be based on the fact that the partial stream lying in the upper jet region, which in the known mixing process is less humid than the areas below it, is sufficiently wetted.
  • liquid mixture and compressed air flow from separate channels into a common mixing area.
  • This mixing area can be located in the interior of the mixing tube or directly on its inner wall (hereinafter referred to as V-mixing tube), or it can be separated from the interior, in this case the mixed product of compressed air and liquid mixture flows through common injection channels into the interior of the mixing tube (in called the following Y mixing tube).
  • V-mixing tube due to the very closely adjacent outlet openings of the injection channels for liquid mixture and compressed air, the compressed air influences the outflow of the liquid mixture from the first injection channels and entrains the water escaping there, so that sufficient mixing occurs regardless of the intensity of the liquid jet of dry mix and water is reached.
  • the compressed air jets emerging from the second injection channels cause an intensive swirling of the dry mixture flow, which also improves mixing.
  • FIG. 1 shows an axial section through a Y mixing tube with premixing of air and water in an annular space
  • FIG. 2 shows an axial section through a Y-mixing tube corresponding to FIG. 1, but with premixing in the injection channels,
  • Fig. 3 shows an axial section of a V-mixing tube with first injection channels for water and second injection channels for compressed air, and
  • Fig. 4 shows an axial section of a mixing tube with premixing of air and water before the first injection channels and with second injection channels for compressed air (combination of Y and V mixing tube).
  • the mixing pipes for the concrete dry spraying shown in the drawing essentially consist of a tubular part, hereinafter called main piece 20, which has an end region 22 for the connection of a delivery line 24 and an end region opposite this on the axis 26 of the mixing pipe, which is the outlet end 28 forms.
  • main piece 20 which has an end region 22 for the connection of a delivery line 24 and an end region opposite this on the axis 26 of the mixing pipe, which is the outlet end 28 forms.
  • the arrangement is such that the clear cross-section for dry mixture 30 conveyed in thin stream in the conveying line 24 practically does not change, only in the region of the outlet end does the main piece 20 converge slightly. An overall nozzle effect is therefore not sought.
  • a distributor ring 32 is screwed tightly into the main piece 20.
  • it has two sets of injection channels 34, both of which are V-shaped to one another and run at an angle of + 60 ° or -60 ° to the axis 26.
  • Each set has a total of twenty injection channels 34, which end in the interior 36 of the mixing tube.
  • the other end of the injection channels 34 is located in an annular space 38, which serves as a mixing chamber in the exemplary embodiment according to FIG. 1. It is connected to a water annulus 42 via a plurality of water channels 40 and also to an air annulus 46 via a plurality of air channels 44 distributed over the circumference. These two annular spaces 42, 46 serve as a supply line and storage for water and air, they make it possible to supply water or air via a single external supply line. They are used to distribute the air or water.
  • the water annulus 42 is connected via a bore 48 to a water connection 50, a controllable valve 52 is interposed.
  • the air annulus 46 is connected to an air supply line 58 via a bore 54 and a controllable valve 56.
  • the water under a pressure of, for example, 6 bar in the water annulus 42 flows through the many water channels 40 into the annulus 38, where it meets a large number of compressed air jets. These come from the air annulus 46, which is under a pressure of slightly more than 6 bar, via a plurality of air channels 44. These water jets occur approximately transversely to the direction of the injection channels 34, whereby an additional swirl is achieved. In contrast, the compressed air jets flow into the annular space 38 approximately in the exit direction of the injection channels 34.
  • a jet splitter, a sharp edge or a sieve can be provided in the annular space 38 and in the exit direction of the water channels 40 in order to mechanically support the destruction of the water.
  • the shape of the annular space is chosen so that an optimal mixing of water and air is achieved in it.
  • the diameter of the injection channels 34 is somewhat larger than in the known mixing tube, because additional air has to be let through. Instead, however, the number of injection channels 34 can be greatly increased compared to the known mixing tube.
  • the annular spaces 42 and 46 are delimited to the outside by a union sleeve 60, which is screwed onto the main piece 20.
  • the mixing process in the exemplary embodiment according to FIG. 2 does not take place in a special mixing space (annular space 38), but in the injection channels 34.
  • the annular space 38 now serves as a water annular space and is connected directly to the interior 36 of the mixing tube via the injection channels 34. Its connection to the outside takes place via a bore 48 which merges into the valve 52 and the water connection 50 (not shown).
  • the injection channels are formed in a distributor ring 32, they are approximately 60 ° to the axis 26 in the conveying direction.
  • a groove 62 is machined into the distributor ring 32 from the outlet end 28, which cuts all the injection channels 34. It communicates with air channels 44 which, like the water channels 40 in the exemplary embodiment according to FIG. 1, are formed and open into the air annulus 46.
  • the premixing according to the invention between air and water takes place where the groove 62 intersects the individual injection channels 34.
  • the premixing according to the invention between air and water can also take place in the area of the water channels, the bore 54 or even further outside.
  • the known mixing tube of the type mentioned at the outset can be converted, for example, to the premixing of air and water according to the invention by injecting compressed air into the (externally visible, curved) water supply line.
  • the suction effect of an air or water stream can also be used to suck in the other partner required for the premixing, such as the air-water mixing, for example in the case of outlet screw connections from Taps is reached.
  • a distributor ring 32 is also provided in the exemplary embodiment according to FIG. 3, but this has In addition to the first injection channels 34, second injection channels 35, which run in a V-shape with respect to one another, open into the interior 36 of the mixing tube with a common outlet hole 37, which are each arranged in the same axial position and are equally spaced over the circumference of the distributor ring 32, so that each Set of injection channels 34, 35 has twenty individual channels.
  • Each injection channel 34 of the first set is assigned an injection channel 35 of the second set, that is to say for compressed air.
  • a common outlet hole 37 there may also be a certain distance between the outlet openings of the injection channels 34, 35 arranged in pairs, but the distance should be at most one millimeter, at most two millimeters.
  • annular circumferential, essentially square recesses are provided which, together with the recessed inner wall of the main piece 20, delimit two annular spaces, namely a water annular space 42 and an air annular space 46.
  • the annular spaces 42, 46 serve for the uniform supply of the individual injection channels 34, 35 with water or compressed air and make it possible that only a water connection 50 and an air supply line 58 are necessary.
  • the water under a pressure of, for example, 6 bar in the water annulus 42 flows through the many first injection channels 34 into the interior 36 of the mixing tube.
  • compressed air which is at a comparable pressure, flows out of the air annulus 46 via the second injection channels 35 into the interior 36.
  • the closely adjacent outlet opening, in FIG. 1 in the form of a common outlet hole 37 it acts at an acute angle Compressed air jet flowing out water jet onto the water jet and causes suction in the area of the first injection channels, whereby the water is additionally conveyed.
  • the compressed air jets from the second injection channels 35 create a swirl zone through which the dry mixture 30 flowing in is swirled strongly.
  • FIG. 3 which shows a pure V mixing tube
  • a combination of a V and a Y mixing tube is shown in the exemplary embodiment according to FIG.
  • the structure is fundamentally similar to the exemplary embodiment according to FIG. 1, only the distributor ring is axially longer and has a total of three annular circumferential recesses, which here, together with the inner wall of the main piece 20, have an air annular space 46 from left to right limit the mixture of air and water serving annular space 38 and a water annular space 42.
  • This water annulus 42 is in turn connected to a water connection 50 via a bore 48.
  • the water flow can be regulated via a valve 52.
  • the water annulus 42 is not the starting point of the first injection channels 34 as in the exemplary embodiment according to FIG. 3, but the water first flows into the annulus 38 via water channels 40, which are designed as axial grooves cut into the outer wall of the distributor ring 32.
  • the air annulus 46 is also connected to an air line 58 via a bore 54 and a controllable valve 56. From it, compressed air can flow directly into the interior 36 via the second injection channels 35, but in addition air channels 44 are also provided, which are also designed as axial grooves and pass through the compressed air into the annular space 38. As a result, compressed air and water mix in the annular space 38, and the mixture flows through the first injection channels 34 into the interior 36. Because of the close proximity between the outlet openings of the injection channels 34, 35 arranged in pairs, the above-described interaction occurs.
  • the additional feeding of compressed air into the first injection channels which corresponds to the Y arrangement, has particular advantages when spraying plastic-containing concrete.
  • the mixing tubes according to the invention are characterized by simple handling, that is, low demands on the user.
  • mixing tubes without constrictions i.e. without a nozzle effect
  • the use of the premixing of water and air according to the invention and for constricted mixing tubes is expressly not to be excluded.
  • discharge funnels such as a Laval nozzle diffuser
  • improvements in the jet characteristics for example in the case of special mixtures, such as those used in mining.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Nozzles (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Claims (9)

1. Procédé de mélange d'un béton projeté contenant une matière plastique dans un tuyau mélangeur, suivant lequel un mélange sec de béton s'écoulant axialement dans le tuyau mélangeur est additionné, avant la sortie du tuyau mélangeur, d'une énnulsion de résine synthétique ainsi que d'eau et leur est mélangé, l'émulsion de résine synthétique et l'eau s'écoulant alors à travers une multiplicité de canaux d'injection disposés transversalement à la direction axiale du tube mélangeur et le rapport en quantité de l'émulsion de résine synthétique et d'eau étant réglable, caractérisé en ce que l'émulsion de résine synthétique et l'eau sont mélangées, en ce que ce mélange s'écoule à travers des premiers canaux d'injection (34), en ce que par l'intermédiaire de seconds canaux d'injection (35,44) auxiliaires débouchant au voisinage immédiat de chacun de ces canaux d'injection (34), ou dans un trou de sortie commun (37) ou à chaque fois dans un premier canal d'injection (34) avant un trou de sortie commun (37), de l'air comprimé est injecté, et en ce que le courant d'air comprimé et le mélange d'émulsion de résine synthétique et d'eau sont réglables indépendamment l'un de l'autre.
2. Procédé suivant la revendication 1, caractérisé en ce qu'avec un mélange d'air comprimé dans le mélange d'émulsion de résine synthétique et d'eau avant la sortie hors des canaux d'injection, le prémélange entre air et eau a lieu dans les canaux d'injection ou dans un espace annulaire réalisé en tant que chambre de mélange.
3. Procédé suivant la revendication 1, caractérisé en ce qu'avec une amenée d'air comprimé dans un trou de sortie commun (37) ou au voisinage immédiat de chaque premier canal d'injection (34), de l'eau mélangée à de l'air comprimé est fournie par l'intermédiaire des premiers canaux d'injection.
4. Procédé suivant la revendication 1 ou 3, caractérisé en ce qu'avec un mélange d'air comprimé par l'intermédiaire de seconds canaux d'injection (35) débouchant au voisinage immédiat de chacun des premiers canaux d'injection (34), les jets contenant de l'eau s'écoulant à partir des premiers canaux d'injection (34) rencontrent sous un angle aigu dans l'espace interne du tuyau mélangeur, les jets d'air comprimé s'écoulant à partir des seconds canaux d'injection (35).
5. Procédé suivant l'une des revendications 1 à 4, caractérisé en ce qu'au mélange sec sont mélangées des pièces d'armature, par exemple des aiguilles d'acier.
6. Tuyau mélangeur pour projection à sec de béton, dont une zone d'extrémité (22) forme un raccord pour une conduite de transport de mélange sec transporté en courant mince, dont l'autre zone d'extrémité (28) opposée axialement à la première forme l'extrémité de sortie, et qui présente un raccord à eau (50) ainsi qu'une chambre annulaire (38), qui est reliée par une multiplicité de canaux d'injection à l'espace interne du tuyau mélangeur, caractérisé en ce que la chambre annulaire (38) servant de chambre de mélange est précédée par un espace annulaire (42) pour l'eau relié au racoord à eau (50) et par un espace annulaire (46) pour l'air relié à un raccord à air (58), espaces qui se trouvent en liaison avec la chambre annulaire (38) par des canaux à eau (40) et des canaux à air (44).
7. Tuyau mélangeur suivant la revendication 6, caractérisé en ce que dans la chambre annulaire (38) et suivant la direction de sortie des canaux à eau (40) est prévu un dispositif favorisant mécaniquement la pulvérisation de l'eau, sous la forme d'un diviseur de jet, d'une arête aiguë ou d'un tamis.
8. Tuyau mélangeur pour la projection à sec de béton, dont une zone d'extrémité (22) forme un raccord pour une conduite de transport de mélange sec transporté en courant mince, dont l'autre zone d'extrémité (28) opposée axialement à la première forme l'extrémité de sortie, et qui présente un raccord à eau (50) ainsi qu'une chambre annulaire (38), qui est reliée par une multiplicité de canaux d'injection à l'espace interne du tuyau mélangeur, caractérisé en ce que pour un mélange d'air comprimé au voisinage immédiat des ouvertures de sortie des premiers canaux d'injection (34) ou dans un trou de sortie commun (37) avec les premiers canaux d'injection (34), des seconds canaux d'injection (35) sont prévus, qui partent d'un second espace annulaire (46) pouvant être raccordé à une source d'air comprimé et s'étendent vers les premiers canaux d'injection (34) sous un angle aigu avec ceux-ci, à chaque canal individuel d'une multiplicité de seconds canaux d'injection (35) étant associé un premier canal d'injection (34).
9. Tuyau mélangeur suivant la revendication 8, caractérisé en ce que les ouvertures de sortie des canaux d'injection (34 et 35) débouchant à proximité immédiate, sont agencées avec un écartement de 2 mm au maximum.
EP83901807A 1982-06-03 1983-06-03 Procede pour le melange d'un beton contenant une matiere plastique pour la realisation d'un beton projete dans un tuyau melangeur et tuyau melangeur pour la mise en oeuvre de ce procede Expired EP0110941B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83901807T ATE32576T1 (de) 1982-06-03 1983-06-03 Verfahren zum mischen eines kunststoffhaltigen spritzbetons in einem mischrohr beim betontrockenspritzen und mischrohr zur durchfuehrung des verfahrens.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19823220880 DE3220880C2 (de) 1982-06-03 1982-06-03 Verfahren zum Mischen von Beton-Trockengemisch und Wasser beim Beton-Trockenspritzen und Mischrohr zum Beton-Trockenspritzen
DE3220880 1982-06-03
DE19823233744 DE3233744A1 (de) 1982-06-03 1982-11-11 Verfahren zum mischen von trockengemisch und wasser beim trockenspritzen und mischrohr fuer das trockenspritzverfahren
DE3233744 1982-11-11

Publications (2)

Publication Number Publication Date
EP0110941A1 EP0110941A1 (fr) 1984-06-20
EP0110941B1 true EP0110941B1 (fr) 1988-02-24

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ID=25802208

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EP83901807A Expired EP0110941B1 (fr) 1982-06-03 1983-06-03 Procede pour le melange d'un beton contenant une matiere plastique pour la realisation d'un beton projete dans un tuyau melangeur et tuyau melangeur pour la mise en oeuvre de ce procede

Country Status (4)

Country Link
EP (1) EP0110941B1 (fr)
AT (1) ATE32576T1 (fr)
DE (1) DE3233744A1 (fr)
WO (1) WO1983004213A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4312994A1 (de) * 1993-04-21 1994-10-27 Franz Joos Vorrichtung zur Verspritzung von Suspensionen, insbesondere Mörteln
CN103382763A (zh) * 2013-08-15 2013-11-06 李正杰 墙面粉料喷涂机组

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CH674007A5 (fr) * 1987-10-02 1990-04-30 Sandoz Ag
NO166397C (no) * 1989-03-16 1991-07-17 Elkem As Anordning for tilsetning av finfordelt microsilica slurrytil et toerrsproeytebetongmunnstykkes vannroer.
NO167721C (no) * 1989-06-29 1991-12-04 Elkem As Sproeytemunnstykke.
GB2265094A (en) * 1991-09-23 1993-09-22 Hampshire Feeding Systems Ltd Wet/dry mixing system
CA3128130A1 (fr) * 2019-02-20 2020-08-27 Pierre SICCARDI Ensemble buse de gunite et dispositif de commande de flux associe

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DE3136737A1 (de) * 1980-09-16 1982-04-29 Rainer Dr. 4330 Mülheim Koehne Verfahren und vorrichtung zur hersellung kunststoffhaltiger trocken-spritzbetone

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Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
DE3136737A1 (de) * 1980-09-16 1982-04-29 Rainer Dr. 4330 Mülheim Koehne Verfahren und vorrichtung zur hersellung kunststoffhaltiger trocken-spritzbetone

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4312994A1 (de) * 1993-04-21 1994-10-27 Franz Joos Vorrichtung zur Verspritzung von Suspensionen, insbesondere Mörteln
DE4312994C2 (de) * 1993-04-21 2001-06-28 Franz Joos Vorrichtung zur Verspritzung von Suspensionen, insbesondere Mörteln
CN103382763A (zh) * 2013-08-15 2013-11-06 李正杰 墙面粉料喷涂机组

Also Published As

Publication number Publication date
DE3233744A1 (de) 1984-03-22
WO1983004213A1 (fr) 1983-12-08
ATE32576T1 (de) 1988-03-15
EP0110941A1 (fr) 1984-06-20
DE3233744C2 (fr) 1987-01-22

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