EP0509502A1 - Buse pour l'application de mortier PCC prêt-à-l'emploi - Google Patents

Buse pour l'application de mortier PCC prêt-à-l'emploi Download PDF

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Publication number
EP0509502A1
EP0509502A1 EP92106587A EP92106587A EP0509502A1 EP 0509502 A1 EP0509502 A1 EP 0509502A1 EP 92106587 A EP92106587 A EP 92106587A EP 92106587 A EP92106587 A EP 92106587A EP 0509502 A1 EP0509502 A1 EP 0509502A1
Authority
EP
European Patent Office
Prior art keywords
pcc
compressed air
mortar
nozzle
spatula
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
EP92106587A
Other languages
German (de)
English (en)
Other versions
EP0509502B1 (fr
Inventor
Johann Dipl.-Ing. Bogel
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.)
Knauf Marmorit GmbH
Original Assignee
Koch Marmorit GmbH
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 Koch Marmorit GmbH filed Critical Koch Marmorit GmbH
Publication of EP0509502A1 publication Critical patent/EP0509502A1/fr
Application granted granted Critical
Publication of EP0509502B1 publication Critical patent/EP0509502B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04—Devices for both conveying and distributing
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04—Devices for both conveying and distributing
    • E04G2021/049—Devices for both conveying and distributing concrete mixing nozzles specially adapted for conveying devices

Definitions

  • the present invention relates to a method for the rehabilitation of concrete by means of machine application of PCC mortar (polymer-modified cement mortar) and, if necessary, subsequently PCC spatula in the wet spraying method, and a device for carrying out the method, the nozzle for applying ready-made PCC mortar and PCC spatula may be of particular importance.
  • PCC mortar polymer-modified cement mortar
  • Shotcrete is applied using two fundamentally different processes: Either the dry mortar mixture is whirled up with compressed air to the spray nozzle, mixed there with water and possibly additives, sprayed onto the surface to be concreted, or a mortar that has already been mixed with water is pumped to the nozzle and compressed air conveyed out of the nozzle.
  • Mortar sprayers are generally so large that they can only be used on large and large construction sites.
  • the use of PCC spray equipment for concrete renovation has so far not played a technical role Role. The reasons for this are multiple: For concrete renovation, relatively small amounts of concrete are required, whereby the damaged areas, depending on the size and depth of the previous damage, require very different amounts and very different application methods.
  • the large mortar spraying devices customary up to now are not suitable for this. Concrete renovation generally requires a series of successive process steps, between which more or less precise breaks for drying and partial or complete setting are required.
  • DE-PS 442 292 describes a concrete spraying system in which the exit speed is regulated in that part of the air is released before the concrete emerges, thereby reducing the exit speed.
  • the regulation takes place via air outlet holes and a ring slide, whereby it should be noted that a suction effect can also occur at high speeds at the air outlet holes.
  • the air outlet opening and the ring slide can also be located on an inclined socket on the delivery pipe.
  • the German utility model 86 25 344 describes a spraying device for a pumpable material with an exchangeable nozzle head which is screwed onto the jet pipe by means of a coarse thread and secured against twisting. As a result, the distance between the firmly welded compressed air pipe and the nozzle hole can be adjusted.
  • the nozzle head should be replaced depending on the type of concrete or mortar used. The adjustment of the distance between the nozzle hole and the end of the compressed air pipe is used for fine adjustment.
  • the invention has therefore set itself the task of improving the concrete renovation by machine application of PCC mortar and possibly subsequently PCC spatula in the wet spray process so that the quality of a manual concrete renovation is achieved and on top of that working time and material are saved, so that the costs for concrete renovation despite the high quality standard.
  • the ready-made PCC mortar is applied in succession by means of compressed air in several layers at different, gradually lower speeds through an elongated nozzle, whereupon the PCC spatula is optionally applied at a relatively slow speed and, if desired, smoothed over the surface or is structured. It when the different application speeds are controlled by the amount of compressed air is particularly advantageous.
  • a device consisting of a mixing and Pumping device for mortar and spatula and a nozzle with a central inlet for compressed air, a control device for the continuous metering of the compressed air and an elongated outlet pipe.
  • This device is particularly easy to handle and easy to control if the nozzle consists of a nozzle body bent at least once at an obtuse angle and has a compressed air supply on the side that is adjustable.
  • a preferred embodiment of the invention is a nozzle for applying ready-made PCC mortar and, if necessary, PCC spatula in the wet spray process, consisting of a nozzle body bent at an obtuse angle, a disconnectable supply line for the prepared mortar or spatula, a detachable compressed air supply which is arranged centrally and in the penetration depth is adjustable, a device for the stepless regulation of the compressed air supply and a screwable elongated nozzle attachment made of wear-resistant material, which is initially conically narrowed inside and then runs out in a practically uniformly narrow pipe section.
  • PCC mortars are particularly suitable for concrete renovation.
  • the applicant's ATON (R) mortar has proven to be particularly suitable. It is a cement according to DIN 1164, aggregates according to DIN 4226 and additives. The maximum grain size of the aggregates is 4 mm.
  • a particular advantage of the process according to the invention is that it is not necessary to apply adhesive sludge. Due to the very high application speed in the first stage, there is such an intense Connection of the binder with the previously cleaned and moistened concrete, so that this previously usual work step can be dispensed with.
  • the concrete to be rehabilitated must also be cleaned beforehand in the method according to the invention, the reinforcing iron must be derusted and, if possible, pretreated with an anti-corrosion agent.
  • the coarse-grained parts of the aggregates are reflected by the hard old concrete or the reinforcing iron and are therefore not integrated.
  • this step ensures an intensive and permanent connection between the old concrete and the newly applied repair mortar, so that the adhesive slurry can be dispensed with.
  • the majority of the PCC mortar is applied at a slower rate, so that there is no longer any segregation, but instead the PCC mortar fills the holes in the old concrete evenly behind the reinforcement bars while filling in all cavities.
  • the invention enables the application speed to be reduced to such an extent that a uniform and almost flat surface is created from the PCC mortar.
  • the application of a filler layer can even be dispensed with.
  • a deeper penetration of the compressed air supply into the nozzle body means that even slow application speeds with fine-grained material can be regulated very precisely, so that layer thicknesses of only 1 to 5 mm can be applied well and evenly from spatula.
  • larger areas with deeper holes are to be filled with mortar, this is preferably done with a high pumping speed for the mortar and a lower immersion depth of the compressed air supply in the nozzle body.
  • the application speed is also steplessly and precisely regulated in these cases according to the invention by the amount of compressed air supplied.
  • both large and deep holes can be filled with mortar, as well as very small and flat holes.
  • additional reinforcement layers of approx. 1 cm or more mortar and / or aesthetically very appealing smooth surfaces with layers of 1 to 5 mm spatula can also be produced perfectly.
  • a particular advantage of the method according to the invention is that only very little waste (rebound) arises. While in conventional concrete renovation with shotcrete, up to 50% of the material used often arises as waste (rebound) and has to be disposed of, the waste according to the invention consists only of the coarser parts of the aggregates from the first coating at high speed. According to the invention, the drop (rebound) is 1 to 5% of the material used. Incidentally, this initial coating is a work step that eliminates the need to apply adhesive slurry.
  • the method according to the invention also solves the problem existing in all mechanical methods, also to spend sufficient amounts of material between tightly lying reinforcement bars and into the cavities behind reinforcement bars, thus avoiding the formation of bubbles and voids. This is of particular importance for the durability of a concrete renovation, since exposed parts of the reinforcing iron are often the starting point for new corrosion.
  • the impact speed can be regulated continuously according to the requirements according to the invention, but always ensures that the material adheres and is compressed sufficiently and thus achieves the desired mechanical strength after setting.
  • a relatively small mixing and pumping device for mortar and spatula is required, which can already be controlled with regard to the quantity to be pumped, if possible.
  • the central insertion is particularly easy if the nozzle body is bent at least once at an obtuse angle. If the nozzle bodies are bent at an obtuse angle, the ready-made PCC mortar or PCC spatula is supplied almost straight. This configuration avoids unnecessary energy losses and ensures easy cleaning of the nozzle after use.
  • the control device for the continuous metering of the compressed air preferably consists of a ball valve. These ball valves are not too smooth and therefore do not tend to be inadvertently adjusted. They are robust enough to meet the requirements on the construction site.
  • the compressed air is preferably supplied centrally through a tube with an outer diameter of approximately 10 mm, which is through a central bore in the nozzle body is introduced.
  • the depth of penetration is preferably adjustable and fixable by means of a lateral screw.
  • This tube for the supply of compressed air into the nozzle body preferably extends into the conical region of the elongated nozzle attachment, which at the outlet end consists of a relatively narrow piece of tube with an almost uniform bore. If necessary, this boring can also be slightly conical and widen slightly towards the outlet end. However, it has been shown that nozzle attachments with a uniform bore are easier to manufacture but are equally effective.
  • These elongated nozzle attachments are preferably made of a wear-resistant material, such as hard PVC.
  • nozzle attachments are preferably screwed onto the nozzle body. It is preferable to use materials for the screw connection that remain functional over a long period of time even under the harsh conditions of a construction site, but are nevertheless easy to operate. Nozzle bodies made of hard aluminum and screw-on thread heads for the elongated nozzle attachment made of brass have proven particularly useful.
  • the mechanical stability of the overall device can be increased by attaching the compressed air line to the supply line for the prepared PCC mortar, so that the work equipment is easy to handle but also mechanically stable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
EP92106587A 1991-04-19 1992-04-16 Buse pour l'application de mortier PCC prêt-à-l'emploi Expired - Lifetime EP0509502B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4112901 1991-04-19
DE4112901 1991-04-19

Publications (2)

Publication Number Publication Date
EP0509502A1 true EP0509502A1 (fr) 1992-10-21
EP0509502B1 EP0509502B1 (fr) 1996-07-03

Family

ID=6429982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106587A Expired - Lifetime EP0509502B1 (fr) 1991-04-19 1992-04-16 Buse pour l'application de mortier PCC prêt-à-l'emploi

Country Status (3)

Country Link
EP (1) EP0509502B1 (fr)
AT (1) ATE140053T1 (fr)
DE (1) DE59206682D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1570908A1 (fr) * 2004-03-04 2005-09-07 Sika Technology AG Buse pour pulvériseur de ciment
WO2020031145A1 (fr) * 2018-08-10 2020-02-13 Sika Technology Ag Lance de projection d'un mortier dispositif la comprenant et procede de projection

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116368A (en) * 1976-12-16 1978-09-26 The United States Of America As Represented By The Secretary Of The Interior Clog-free inorganic grout emplacement gun
GB2011518A (en) * 1977-11-23 1979-07-11 Ibstock Building Products Ltd Cement guns
DE8625344U1 (de) * 1985-11-06 1987-01-15 Gruber, Rudolf, Millstatt Spritzvorrichtung für ein pumpbares Material
DE9001902U1 (de) * 1990-02-17 1990-04-19 BETEC Gesellschaft für angewandte Betontechnologie mbH, 4300 Essen Zweistoffdüse zum Versprühen breiartiger Materialien, insbesondere von Spritzbeton, mittels Druckluft

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116368A (en) * 1976-12-16 1978-09-26 The United States Of America As Represented By The Secretary Of The Interior Clog-free inorganic grout emplacement gun
GB2011518A (en) * 1977-11-23 1979-07-11 Ibstock Building Products Ltd Cement guns
DE8625344U1 (de) * 1985-11-06 1987-01-15 Gruber, Rudolf, Millstatt Spritzvorrichtung für ein pumpbares Material
DE9001902U1 (de) * 1990-02-17 1990-04-19 BETEC Gesellschaft für angewandte Betontechnologie mbH, 4300 Essen Zweistoffdüse zum Versprühen breiartiger Materialien, insbesondere von Spritzbeton, mittels Druckluft

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1570908A1 (fr) * 2004-03-04 2005-09-07 Sika Technology AG Buse pour pulvériseur de ciment
WO2005084818A1 (fr) * 2004-03-04 2005-09-15 Sika Technology Ag Buse a beton projete
WO2020031145A1 (fr) * 2018-08-10 2020-02-13 Sika Technology Ag Lance de projection d'un mortier dispositif la comprenant et procede de projection
FR3084897A1 (fr) * 2018-08-10 2020-02-14 Parexgroup Sa Lance de projection d'un mortier humide granulaire dispositif le comprenant et procede de projection faisant intervenir la lance et/ou le dispositif
CN112567104A (zh) * 2018-08-10 2021-03-26 Sika技术股份公司 颗粒状湿灰浆喷枪、有喷枪的装置及使用喷枪和/或装置的喷射方法
EP3960962A1 (fr) * 2018-08-10 2022-03-02 Sika Technology AG Procédé de projection faisant intervenir une lance de projection d'un mortier humide granulaire

Also Published As

Publication number Publication date
ATE140053T1 (de) 1996-07-15
DE59206682D1 (de) 1996-08-08
EP0509502B1 (fr) 1996-07-03

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