EP1570908A1 - Buse pour pulvériseur de ciment - Google Patents

Buse pour pulvériseur de ciment Download PDF

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Publication number
EP1570908A1
EP1570908A1 EP04005065A EP04005065A EP1570908A1 EP 1570908 A1 EP1570908 A1 EP 1570908A1 EP 04005065 A EP04005065 A EP 04005065A EP 04005065 A EP04005065 A EP 04005065A EP 1570908 A1 EP1570908 A1 EP 1570908A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
shotcrete
cross
section
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04005065A
Other languages
German (de)
English (en)
Inventor
Cyrill Spirig
Bruno Tidona
Alexander Stücheli
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.)
Sika Technology AG
Original Assignee
Sika Technology AG
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 Sika Technology AG filed Critical Sika Technology AG
Priority to EP04005065A priority Critical patent/EP1570908A1/fr
Priority to PCT/EP2005/050979 priority patent/WO2005084818A1/fr
Publication of EP1570908A1 publication Critical patent/EP1570908A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1481—Spray pistols or apparatus for discharging particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge

Definitions

  • the invention relates to a shotcrete nozzle for applying wet shotcrete or dry sprayed concrete with an inlet cross-section, a subsequent Acceleration range, which narrows to a minimum cross-section and in an exit region with a terminal exit cross-section passes.
  • a shotcrete nozzle is then used when wet shotcrete or dry shotcrete to be applied to a building surface.
  • a shotcrete nozzle For example be surface sections inside a tunnel with Shotcrete coated as a cladding layer, insulating layer, static Support layer or protective layer acts.
  • the speed must be of the shotcrete can be set to a certain value.
  • the speed of the shotcrete is in the shotcrete nozzle through the Cross section of the nozzle set. It is generally from hydrodynamics known that in a tube, which is traversed by a medium at constant flow rate, the flow rate at cross-sectional constriction increased and lowered accordingly at cross-sectional widening (Continuity equation). According to this continuity equation is also in a shotcrete nozzle by cross-sectional constriction in an acceleration range the nozzle increases the speed of the shotcrete. In a discharge area of the nozzle, the shotcrete with the desired Speed applied to the building surface.
  • the normal component of the abrasion force of the shotcrete can be used as a measure of the abrasion can be seen on the nozzle inner wall.
  • the normal component of the abrasion force of the flowing shotcrete assume a constant value and consequently the abrasion along the Acceleration range are distributed more evenly. Bodies that at previous Nozzles due to increased abrasion weak spots or unwanted Predetermined breaking points are now largely avoided.
  • an inclination angle ⁇ is defined in a shotcrete nozzle
  • the between the nozzle inner wall and the main flow direction of the concrete occurs so can a special cross-sectional profile of the acceleration range be formed by the inclination angle ⁇ at the nozzle inner wall of the acceleration range at the inlet cross-section greater is as at the minimum cross section.
  • the reduction of the inclination angle ⁇ can be adjusted so that the normal component of the abrasion force along of the acceleration range remains the same, although the abrasion force in Main flow direction through the cross-sectional constriction and concomitantly Speed increase increases.
  • a particularly even course of the normal component of the abrasion force can be achieved by the fact that the inclination angle ⁇ at least over most of the acceleration range in the main flow direction continuously reduced in size. This will cause abrupt abrasions avoided.
  • the wear or the abrasion can affect the entire nozzle inner wall of the acceleration range are distributed uniformly, when the inclination angle ⁇ over the entire acceleration range continuously reduced in the main flow direction.
  • the cross-sectional profile of the acceleration range can also be determined by a mathematical condition.
  • ⁇ (x) is the angle of inclination at the arbitrary point x
  • R 0 is the radius of the inlet cross section.
  • the particle impact of the concrete particles on the nozzle wall becomes mathematical modeled.
  • the kinetic energy of a mass point which is a concrete particle is represented in a place with a certain speed according to the book by Holzmann, Engineering Mechanics, Part 2, B.G. Teubner, Stuttgart 1991, as described on page 93, scheduled.
  • Holzmann Engineering Mechanics, Part 2, B.G. Teubner, Stuttgart 1991, as described on page 93, scheduled.
  • this equation can be obtained.
  • stencils for nozzles of different diameters be created, the templates one according to the mathematical Condition predetermined to the nozzle inner wall clinging Have cross-sectional shape.
  • a template with a suitable diameter can in the nozzle interior to the nozzle inner wall of the associated Nozzle can be kept visually better visible to the current wear close.
  • acceleration area and / or the exit area constructed rotationally symmetrical with respect to the main flow direction is.
  • a nozzle is particularly easy and inexpensive create as a rotating part and on the other hand, the rotational symmetry affects positive for the flow within the nozzle.
  • the inclination angle ⁇ in the exit area should be between 0.1 degrees to approx about 1 degree. At an inclination angle of 0.5 degrees have already been achieved particularly positive results in terms of beam guidance.
  • the beam guidance can be achieved.
  • the nozzle inner wall can reduce a coating that consists of a particularly abrasion resistant material, have.
  • the advantage is that the material of the nozzle wall, which with the concrete is in contact and thus increasingly rubbed off, particularly resistant is executed.
  • the remaining nozzle material can now from a less abrasion-resistant and more favorable material costs be prepared.
  • such a coating of the nozzle inner wall produced by build-up welding.
  • the coating can also be inserted through a nozzle that can be inserted into the nozzle Be implemented use, the use of example a ceramic material is formed. This can then wear only the insert can be changed. It is conceivable that already by abrasion worn shotcrete nozzles, which previously had to be disposed of, now through, for example, turning out the abraded surface and inserting it Use, reusable.
  • the nozzle may have one or more injection channels, over which further Media, such as air, water or binder, admixed with the concrete can be.
  • Media such as air, water or binder
  • injection channels can preferably be in the region of the inlet cross section be arranged of the acceleration range. In this area is the flow velocity of the concrete lowest. This will avoided disturbing the flow of concrete when introducing other substances becomes or becomes turbulent.
  • FIG. 1 shows a sectional view 1 of a known shotcrete nozzle along the main flow direction 10 of the concrete.
  • the shotcrete nozzle has, on the left in FIG. 1, an acceleration region 2, which narrows in cross-sectional shape from an inlet cross section 4 to a minimal cross section 5.
  • the nozzle inner wall 2.1 of the acceleration region 2 is inclined relative to the main flow direction 10 of the concrete by a fixed angle of inclination ⁇ .
  • ⁇ By this cross-sectional constriction, the flow rate of the concrete mixture from the inlet cross-section 4 is increased to the minimum cross section 5.
  • the particle velocity is symbolized by the arrows with the reference numeral 9 below the nozzle.
  • channels 7 are shown in Figure 1 and in Figures 2 to 4 in the acceleration region 2, which have openings 8 in the nozzle inner wall 2.1 and the Düsenaussenwandung. Through these channels 7, which need not necessarily be part of a nozzle, additives can be added to the concrete mix.
  • the acceleration region 2 is followed on the right in FIG. 1 by the exit region 3, the nozzle wall 3.1 with respect to the main flow direction 10 of the Concrete has a fixed angle of inclination of 0 degrees.
  • the cross section in the exit area 3 does not change its surface. Due to the constant cross section is the velocity according to the continuity equation of hydrodynamics with the concrete moves in the direction of exit section 6 also consistently.
  • the constant speed is the same length Arrows 9 shown below the outlet area 3.
  • the predominantly made of sand concrete is passed with a certain flow rate per unit time through the shotcrete nozzle. This leads to the nozzle inner walls 2.1 and 3.1 to a material abrasion. After a period of time, this abrasion will result in replacement of the nozzle.
  • the material removal at the nozzle inner walls 2.1 and 3.1 along the main flow direction 10 is different degrees.
  • the normal component F N of the abrasion force F (x) can be taken as a measure of the material abrasion. The higher the normal component F N of the abrasion force F (x), the higher the material removal.
  • FIG. 2 shows the sectional view 1 of the shotcrete nozzle of FIG. 1, and additionally in the acceleration region 2 the profile of the magnitude and direction of the normal component F N of the abrasion force F (x).
  • the abrasion force F (x) which runs parallel to the main flow direction 10, is shown at three points of the nozzle wall 2.1.
  • the respective local normal component F N of the abrasion force F (x) is shown as an arrow and the arrow length represents the amount. It can be seen from FIG. 2 that the normal component F N of the abrasion force F (x) in the acceleration region 2 increases from left to right. Thus, the abrasion on the nozzle wall 2.1 will increase.
  • the amount of the normal component F N of the abrasion force F (x) will therefore increase analogously to the increase in the abrasion force F (x) in the main flow direction 10. Namely, by the constant factor sin ( ⁇ ), since the inclination angle ⁇ in the region 2 is constant.
  • FIG. 3 now shows a sectional view 1 of a special embodiment of a new shotcrete nozzle along the main flow direction.
  • the shotcrete nozzle shows a different cross-sectional configuration than the known shotcrete nozzles of Figures 1 and 2. Due to the special cross-sectional design, the normal component F N of the abrasion force F (x) acts evenly on the nozzle wall. In the new shotcrete nozzle in the acceleration region 2 of the inclination angle ⁇ is smaller from left to right. This results in a slightly convex to the nozzle interior directed nozzle inner wall 2.1. Changes were also made in exit area 3.
  • FIG. 3 shows a favorable design of the exit region 3.
  • the outlet region 3 has a special cross-sectional profile, in the inclination angle ⁇ to the outlet cross-section 6 increases continuously. This cross-sectional area in the exit region 3 has only a slight effect on the Speed of the concrete, however, by this design, the concrete beam more compact due to a better particle distribution.
  • FIG. 4 shows the same sectional view 1 of the sprit concrete nozzle from FIG. 3, in which the course of the magnitude and the direction of the normal component F N of the abrasion force F (x) are additionally shown.
  • the normal component F N of the abrasion force F (x) is constant in the acceleration region 2. This is achieved by the inclination angle ⁇ decreasing from left to right.
  • the product of F (x) ⁇ sin ( ⁇ ) corresponding to the normal component F N of the abrasion force F (x) can be adjusted to a constant value.
  • FIG. 5 and FIG. 6 each show schematically a particle distribution 12 and 13 of shotcrete particles 11 after the spray jet emerges from the nozzle in a plane perpendicular to the main flow direction 10.
  • the black dots are intended to represent the individual shotcrete particles 11, the shotcrete particles 11 being covered with cement gel coated sand particles are.
  • a particle distribution 12 is shown, as would result after the exit region 3 or when it emerges on the substrate in the case of the known nozzles shown in FIGS. 1 and 2. It can be seen that the particle distribution is not homogeneous over the cross section and in the central region a greater accumulation of shotcrete particles 11 occurs.
  • a particle distribution 13 is shown, as they are after the Exit area 3 or when appearing on the ground at the in Figures 3 and 4 would show new nozzles.
  • the shotcrete particles 11 via the cross section is distributed very homogeneously. This has a positive overall effect the homogeneity of the concrete stream and thus the homogeneity of the shotcrete on the ground.
  • the distribution the particle over the cross section but no influence on the wear on the nozzle inner wall has.
  • a shotcrete nozzle for wet shotcrete by the invention or dry sprayed concrete provided, compared to the previous known shotcrete nozzles less wear and has and thus has a longer service life and with regard to the beam guidance of the concrete is optimized.

Landscapes

  • Nozzles (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Lining And Supports For Tunnels (AREA)
EP04005065A 2004-03-04 2004-03-04 Buse pour pulvériseur de ciment Withdrawn EP1570908A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04005065A EP1570908A1 (fr) 2004-03-04 2004-03-04 Buse pour pulvériseur de ciment
PCT/EP2005/050979 WO2005084818A1 (fr) 2004-03-04 2005-03-04 Buse a beton projete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04005065A EP1570908A1 (fr) 2004-03-04 2004-03-04 Buse pour pulvériseur de ciment

Publications (1)

Publication Number Publication Date
EP1570908A1 true EP1570908A1 (fr) 2005-09-07

Family

ID=34745998

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04005065A Withdrawn EP1570908A1 (fr) 2004-03-04 2004-03-04 Buse pour pulvériseur de ciment

Country Status (2)

Country Link
EP (1) EP1570908A1 (fr)
WO (1) WO2005084818A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2436496A1 (fr) 2010-10-01 2012-04-04 Sika Technology AG Dispositif de mélange pour mélanges aptes au pompage, en particulier pour béton projeté
WO2012042012A1 (fr) 2010-10-01 2012-04-05 Sika Technology Ag Appareil mélangeur pour mélanges pompables et procédé s'y rapportant
EP2476530A1 (fr) 2011-01-12 2012-07-18 Sika Technology AG Pièce auxiliaire et élément de boîtier pour un dispositif de mélange
EP3939695A1 (fr) 2020-07-14 2022-01-19 Sika Technology Ag Dispositif et procédé d'ajout et de mélange d'un additif dans un mélange durcissable par voie hydraulique
WO2022038036A1 (fr) 2020-08-17 2022-02-24 Mobbot Sa Buse permettant de pulvériser du béton ou un matériau similaire, parties de celle-ci et appareil de fabrication de structure l'utilisant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2143498B1 (fr) 2008-07-08 2012-10-03 Sika Technology AG Buse de pulvérisation d'un matériau thermoplastique en dureté variable

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978189A (en) * 1958-05-14 1961-04-04 A R B E D Acieries Reunies De Nozzle
FR2234746A5 (en) * 1973-05-29 1975-01-17 Turbosol A I Srl Spray gun for mechanical mortar overlay application - with mortar and compressed air ducts ending in spray nozzle and elastic diffuser respectively
JPS6168157A (ja) * 1984-09-11 1986-04-08 Shinagawa Refract Co Ltd 所定の噴出液圧に制御し得るコンクリ−ト又は耐火物吹付用ノズル
EP0509502A1 (fr) * 1991-04-19 1992-10-21 KOCH MARMORIT GmbH Buse pour l'application de mortier PCC prêt-à-l'emploi
DE19652811A1 (de) 1995-12-27 1997-07-03 Sandoz Ag Verfahren und Einrichtung zum Beschichten von Tunnelinnenwänden mit Spritzbeton

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978189A (en) * 1958-05-14 1961-04-04 A R B E D Acieries Reunies De Nozzle
FR2234746A5 (en) * 1973-05-29 1975-01-17 Turbosol A I Srl Spray gun for mechanical mortar overlay application - with mortar and compressed air ducts ending in spray nozzle and elastic diffuser respectively
JPS6168157A (ja) * 1984-09-11 1986-04-08 Shinagawa Refract Co Ltd 所定の噴出液圧に制御し得るコンクリ−ト又は耐火物吹付用ノズル
EP0509502A1 (fr) * 1991-04-19 1992-10-21 KOCH MARMORIT GmbH Buse pour l'application de mortier PCC prêt-à-l'emploi
DE19652811A1 (de) 1995-12-27 1997-07-03 Sandoz Ag Verfahren und Einrichtung zum Beschichten von Tunnelinnenwänden mit Spritzbeton

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
GERHARD GIRMSCHEID: "Baubetrieb und Bauverfahren im Tunnelbau", ISBN: 3-433-01350-0
HOLZMANN: "Technische Mechanik", 1991, B.G.TEUBNER, STUUTGART, pages: 93
PATENT ABSTRACTS OF JAPAN vol. 0102, no. 35 (C - 366) 14 August 1986 (1986-08-14) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2436496A1 (fr) 2010-10-01 2012-04-04 Sika Technology AG Dispositif de mélange pour mélanges aptes au pompage, en particulier pour béton projeté
WO2012042012A1 (fr) 2010-10-01 2012-04-05 Sika Technology Ag Appareil mélangeur pour mélanges pompables et procédé s'y rapportant
US9364969B2 (en) 2010-10-01 2016-06-14 Sika Technology Ag Mixing apparatus for pumpable mixtures and method related thereto
EP2476530A1 (fr) 2011-01-12 2012-07-18 Sika Technology AG Pièce auxiliaire et élément de boîtier pour un dispositif de mélange
WO2012095480A1 (fr) 2011-01-12 2012-07-19 Sika Technology Ag Organe d'ajout et élément de boîtier pour un dispositif mélangeur
US10160138B2 (en) 2011-01-12 2018-12-25 Sika Technology Ag Admixture piece and housing element for a mixing device
EP3939695A1 (fr) 2020-07-14 2022-01-19 Sika Technology Ag Dispositif et procédé d'ajout et de mélange d'un additif dans un mélange durcissable par voie hydraulique
WO2022013043A1 (fr) 2020-07-14 2022-01-20 Sika Technology Ag Dispositif et procédé pour ajouter et mélanger un additif à un mélange à prise hydraulique
WO2022038036A1 (fr) 2020-08-17 2022-02-24 Mobbot Sa Buse permettant de pulvériser du béton ou un matériau similaire, parties de celle-ci et appareil de fabrication de structure l'utilisant

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Publication number Publication date
WO2005084818A1 (fr) 2005-09-15

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