WO1985001005A1 - Appareil de coupe du beton - Google Patents

Appareil de coupe du beton Download PDF

Info

Publication number
WO1985001005A1
WO1985001005A1 PCT/GB1984/000305 GB8400305W WO8501005A1 WO 1985001005 A1 WO1985001005 A1 WO 1985001005A1 GB 8400305 W GB8400305 W GB 8400305W WO 8501005 A1 WO8501005 A1 WO 8501005A1
Authority
WO
WIPO (PCT)
Prior art keywords
particles
conduit
reservoir
concrete
entrained
Prior art date
Application number
PCT/GB1984/000305
Other languages
English (en)
Inventor
Robert Mark Fairhurst
David Henry Saunders
Original Assignee
The British Hydromechanics Research Association
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 The British Hydromechanics Research Association filed Critical The British Hydromechanics Research Association
Publication of WO1985001005A1 publication Critical patent/WO1985001005A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
    • B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting

Definitions

  • the invention relates to fluid/abrasive ⁇ ystems, including air/abrasive systems, for cutting concrete.
  • known apparatus for cutting concrete comprises charging means for entraining particulate material in fluid and conduit means for directing fluid and the entrained particulate material on to a piece of concrete to be cut.
  • the particulate material comprises small abrasive particules
  • the apparatus has little effect on the aggregate unless the fluid medium is a liquid which can dislodge the larger particles of aggregate material.
  • the fluid medium is a liquid which can dislodge the larger particles of aggregate material.
  • small abrasive particles entrained in high velocity water jets can produce good quality cuts in concrete.
  • one disadvantage of this form of apparatus is the accumula ⁇ tion of large quantities of liquid.
  • charging means which are capable of entraining particulate material of at least two different sizes. including first particles of abrasive material and second particles which are larger and heavier than the first particles.
  • apparatus for cutting concrete, comprising charging means for entraining, in fluid, particulate material of at least two different sizes , including first particles of abrasive material and second particles which are larger and heavier than the first particles, and conduit means for directing the fluid and the entrained particulate material onto concrete to be cut.
  • the invention also provides a method of cutting concrete comprising the steps of entraining, in fluid, particulate material of at least two different sizes, including first particles of abrasive material and second particles which are larger and heavier than the first particles, and directing the fluid and the entrained particulate material onto concrete to be cut.
  • first and second particles may be entrainedi n seperat e streams of fluid which are independently directed onto the concrete, it is preferred to entrain all of the particulate material in a single stream of fluid medium which is then directed onto the concrete to be cut.
  • One form of apparatus suitable for this purpose can be obtained by modifying the apparatus disclosed in British Patent Specification No. 1 569 736 in which a liquid jet is passed through a mixing chamber and particulate material is fed through one or more passages which each extend on an axis converging with the axis of the jet and open in to the mixing chamber at a position radially spaced from the liquid jet.
  • the apparatus disclosed in British Patent Specification No. 1 569 736 may be modified by providing means for entraining the second particles in the liquid jet which is passed through the mixing chamber, the smaller first particles of abrasive material being fed through the or each convergent conduit. In this case, the smaller first particles of abrasive material could be fed either dry or in suspension with gas or liquid.
  • particulate material of at least two different sizes may be exploited even more where the particulate material is entrained in a gaseous medium instead of in a liquid medium or a mixed liquid/gas medium.
  • a mixture of large and small particles it is possible to achieve good quality cuts in concrete using standard portable air compressors and sub-sonic air velocities.
  • the charging means comprise first and second reservoirs and the conduit means comprise first, second and third conduits; gaseous medium is supplied through the first conduit; the first particles of abrasive material are supplied through the first reservoir; the first conduit has an outlet, end and provides for the supply of gaseous medium; the first reservoir surrounds the outlet end of the first conduit and has a convergent portion extending beyond the outlet end of the first conduit for entrainment of the first particles of abrasive material; the second conduit has an outlet end and extends from the convergent portion of the first reservoir to form an extension of the first conduit; the second reservoir surrounds the outlet end of the second conduit and has a convergent portion extending beyond the outlet end of the second conduit; and the third conduit extends from the convergent portion of the second reservoir to form an extension of the second conduit.
  • the amount of material removed depends on the particle tip velocity. This tip velocity can be increased by inducing spin on the particle. If this spin velocity is significant then an increase in cutting performance can be realised.
  • Another method of producing particle spin is to use a vortex chamber at the inlet to the second reservoir.
  • the smaller first particles of abrasive material are entrained in the gaseous medium first, before the stream of gaseous medium is also used to accelerate the larger second partic ⁇ es.
  • the larger particles enter through a tangential inlet creating a vortex which spirals downwards towards the convergent portion of the second reservoir.
  • An air ejector may be used in this design to increase the swirl velocity at inlet to the vortex chamber while still maintaining suction at the inlet to the second reservoir.
  • Figure 1 is a sectional side elevation of a preferred concrete cutting apparatus in accordance with the invention
  • Figure 2 is a schematic side elevation of a second embodiment, of the invention, comprising a modification of the apparatus shown in Figure 1;
  • Figure 3 is an enlarged view of part of Figure 1, showing a modification in accordance with a third embodiment, of the invention.
  • Figure 4 is a schematic side elevation of a fourth embodiment of apparatus for cutting concrete, in accordance with the invention.
  • first, second and third conduits 9, 11 and 13, of progressively greater diameter are coaxially aligned with each other so that the second conduit 11 provides an extension of the first conduit 9 and the third conduit 13 provides an extension of the second conduit 11.
  • first and second conduits 9 and 11 are surrounded by first and second reservoirs 1 and 4 respectively provided with inlet conduits 2 and 5 and convergent portions 3 and (which respectively surround the outlet ends 10 and 12 of the first. and second conduits 9 and 11.
  • air blown through the first conduit 9 entrains first particles of abrasive material fed into the first reservoir 1 through the inlet conduit. 2 and this suspension entrains second, larger and heavier particles which are fed into the second reservoir Athrough inlet conduit 5 so that air containing a suspension of both first and second particles issues from the third conduit 13.
  • the sizes of the first and second particles are chosen to suit the aggregate used in the concrete which is to be cut and this in turn determines the size of the components in the apparatus through which the particles are passed.
  • gravel and copper slag particles with maximum sizes, respectively, of 12mm and 2.0mm have been used to cut 50mm thick concrete with aggregate no larger than 25mm. These particles are passed through an apparatus in which the first, second and third conduits 9, 11 and 13 have internal diameters of 10 mm, 16 mm and 25 mm and in which the first and second reservoirs have internal diameters of 30 mm and 50 mm and convergent portions 3 and 6 in which the sides are inclined at 60 degrees to the horizontal.
  • first particles 7 of abrasive material from a first reservoir 1 of a pressurised abrasive feed system 18, such as is commonly used for abrasive cleaning applications are supplied with pressurised air through a flexible conduit 11 to a discharge nozzle 12 which is surrounded by a convergent portion 6 of a reservoir 4 containing second particles 8 which are larger and heavier than the first particles 7 of abrasive material.
  • the second particles 8 are then entrained in the suspension of air and first particles 7 and issue from the conduit 13 as a mixture of first and second particles 7 and 8 entrained in air.
  • a helical band 17 of rigid sheet material is mounted inside the second reservoir 4, around the second conduit 11, so as to provide an inclined path for the second particles 8 as they pass through the second reservoir 4 towards the outlet end 12 of the second conduit 11.
  • This causes second particles 8 to roll down the helical band 17 and at least some of these particles are flicked by the air and entrained first particles 7 issuing from the second conduit 11 so as to increase the rate at which these second particles spin and this spin increases the effectiveness of the second particles 8 in removing aggregate particles from the concrete to be cut.
  • Figure 4 illustrates a different form of apparatus in which a spin is imparted to the second particles 8 to improve the effectiveness of these second particles 8 in removing aggregate particles of the concrete to be cut.
  • a vortex chamber 14 is provided at the inlet end of the second reservoir 4 and the inlet conduit 5 extends tangentially of the vortex chamber 14 and is provided with a coaxially extending air injector 15 for the purpose of blowing second particles 8 from a hopper 16 into the vortex chamber 14 so that these second particles 8 follow a spiral path through the second reservoir 4 and into the third conduit 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

De l'air amené au travers d'une première conduite (9) entraîne des premières particules (7) d'un matériau abrasif depuis un premier réservoir (1) entourant l'extrémité de sortie de la première conduite (9). La suspension des premières particules (7) dans l'air passe au travers d'une seconde conduite (11) s'étendant depuis le premier réservoir (1) et entraîne des secondes particules (8) qui sont plus grosses et plus lourdes que les premières particules (7). L'alimentation en secondes particules (8) se fait à partir d'un second réservoir (4) entourant l'extrémité de sortie de la seconde conduite (11) et on provoque le tourbillonnement de ces particules en les faisant passer par une chambre de tourbillonnement (14) formant la partie d'admission du second réservoir (4). La suspension des premières et des secondes particules (7 et 8) est dirigée sur le béton à couper au travers d'une troisième conduite (13) s'étendant depuis le second réservoir (4). Les premières particules (7) servent à éroder la matrice de ciment du béton et les secondes particules (8) servent à briser et déloger les particules d'aggloméré noyées dans la matrice.
PCT/GB1984/000305 1983-09-01 1984-08-31 Appareil de coupe du beton WO1985001005A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8323525 1983-09-01
GB838323525A GB8323525D0 (en) 1983-09-01 1983-09-01 Concrete cutting apparatus

Publications (1)

Publication Number Publication Date
WO1985001005A1 true WO1985001005A1 (fr) 1985-03-14

Family

ID=10548217

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1984/000305 WO1985001005A1 (fr) 1983-09-01 1984-08-31 Appareil de coupe du beton

Country Status (3)

Country Link
EP (1) EP0153942A1 (fr)
GB (1) GB8323525D0 (fr)
WO (1) WO1985001005A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2375063A (en) * 2001-05-03 2002-11-06 Morgan Crucible Co Machining a workpiece with an abrasive blast
CN114761092A (zh) * 2019-11-25 2022-07-15 罗森巴赫国际股份公司 喷枪、特别是用于消防的灭火喷枪

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE206610C (fr) *
FR811771A (fr) * 1936-10-08 1937-04-22 Gen Engineering Co Inc Ajutage pour jet de sable
FR838272A (fr) * 1937-11-09 1939-03-02 Procédé et dispositifs perfectionnés pour produire un jet d'abrasif
US2440643A (en) * 1945-03-14 1948-04-27 George F Pettinos Sandblast nozzle
US3344558A (en) * 1965-07-23 1967-10-03 Wyatt S Kirkland Sand blast nozzle
US3985848A (en) * 1974-12-05 1976-10-12 Bredero Price, B.V. Method for cutting concrete coated pipe
DE2724318A1 (de) * 1977-05-28 1978-11-30 Peiniger Ernst Gmbh Verfahren und anlage zum druckluftstrahlen
DE2948380A1 (de) * 1979-12-01 1981-07-09 Alexandr Vladimirovič Saratov Lizin Verfahren zur beseitigung von graten

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE206610C (fr) *
FR811771A (fr) * 1936-10-08 1937-04-22 Gen Engineering Co Inc Ajutage pour jet de sable
FR838272A (fr) * 1937-11-09 1939-03-02 Procédé et dispositifs perfectionnés pour produire un jet d'abrasif
US2440643A (en) * 1945-03-14 1948-04-27 George F Pettinos Sandblast nozzle
US3344558A (en) * 1965-07-23 1967-10-03 Wyatt S Kirkland Sand blast nozzle
US3985848A (en) * 1974-12-05 1976-10-12 Bredero Price, B.V. Method for cutting concrete coated pipe
DE2724318A1 (de) * 1977-05-28 1978-11-30 Peiniger Ernst Gmbh Verfahren und anlage zum druckluftstrahlen
DE2948380A1 (de) * 1979-12-01 1981-07-09 Alexandr Vladimirovič Saratov Lizin Verfahren zur beseitigung von graten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Engineering, Vol. 223, No. 6, issued June 1983 (London, GB) "Water Jets Work Harder", see page 460, Photo "Reinforced Concrete Cut with Abrasive Jets", and page 461, column 1, paragraph 1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2375063A (en) * 2001-05-03 2002-11-06 Morgan Crucible Co Machining a workpiece with an abrasive blast
GB2375063B (en) * 2001-05-03 2003-04-16 Morgan Crucible Co Abrasive blast machining
CN114761092A (zh) * 2019-11-25 2022-07-15 罗森巴赫国际股份公司 喷枪、特别是用于消防的灭火喷枪

Also Published As

Publication number Publication date
EP0153942A1 (fr) 1985-09-11
GB8323525D0 (en) 1983-10-05

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