EP1379734A1 - A method and a machine for working a concrete surface - Google Patents

A method and a machine for working a concrete surface

Info

Publication number
EP1379734A1
EP1379734A1 EP02723016A EP02723016A EP1379734A1 EP 1379734 A1 EP1379734 A1 EP 1379734A1 EP 02723016 A EP02723016 A EP 02723016A EP 02723016 A EP02723016 A EP 02723016A EP 1379734 A1 EP1379734 A1 EP 1379734A1
Authority
EP
European Patent Office
Prior art keywords
jets
angle
degrees
oscillation
concrete
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
EP02723016A
Other languages
German (de)
French (fr)
Other versions
EP1379734B1 (en
Inventor
Carl KESSON STRÖMDAHL
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.)
Conjet AB
Original Assignee
Conjet AB
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 Conjet AB filed Critical Conjet AB
Publication of EP1379734A1 publication Critical patent/EP1379734A1/en
Application granted granted Critical
Publication of EP1379734B1 publication Critical patent/EP1379734B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
    • E01C23/128—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with hydrojets

Definitions

  • This invention relates to a method of removing concrete from a concrete surface, for example to free the reinforcing bars in the road bed of a bridge, by ejecting a high pressure water jet from a nozzle that is kept close to the surface and reciprocated in parallel sweeps simultaneously with being oscillated transversely to the sweeping, and swinging the nozzle between the sweeps so that it is has an angle of attack in both sweeping movements.
  • the invention relates also to a machine for working a concrete surface down to the reinforcement of the concrete, comprising a vehicle on wheels having a transverse feed beam with a carriage that carries a water jet nozzle, where the nozzle is swingable about a first axis so as to give the jet an angle of attack in both directions when the carriage is reciprocated forth and back in working sweeps and swingable about a second axis so as to be oscillating in a plane transverse to feed beam.
  • Road salting influences concrete road beds and the surface layer of road beds of concrete bridges need to be replaced after some years before the salt has penetrated down to the steel reinforcement; otherwise will the maintenance costs be very high. Therefore, one wants to remove the upper concrete layer to free the uppermost reinforcement layer and cast a new concrete surface layer before the uppermost reinforcement layer has been affected by the salt.
  • Machines for such concrete removal are known for example by SE-451742-B, SE-508821-C, US- 5361993-A, US-4854770, and US-4753549-A and others.
  • This object is fulfilled in principle by the use of two nozzles that are jointly swept and oscillated while held in an angle to each other so that the ejecting jets impinge on the concrete at different angles as seen in the direction of oscillation.
  • the above defined carriage carries two jet ejecting nozzles that are jointly swingable about said axes and has an angle between their jet directions that is between 10 and 50 degrees as seen in the direction of the oscillation.
  • Figure 1 is a top plan view of a machine shown as an example of the invention.
  • Figure 2 is a side view of the machine shown in figure 1.
  • Figure 3 is a close-up view of the front part of figure 2.
  • Figure 4 is an enlarged perspective view of a twin nozzle arrangements shown in figure 2.
  • Figure 5 is a side view of the twin nozzle arrangement.
  • Figure 6 is a view of the nozzles shown in figure 5 seen towards the front ends of the nozzles as indicated by line 6-6 in figure 4.
  • the machine shown in figures 1-2 consists of a vehicle carried by two front wheels 12,13 with built-in motors 14,15 and two rear wheels 16,17 by which it can be steered.
  • the machine has a pillar18 that is rotatable about an axis I and forms a guide for a carrier 20.
  • the carrier 20 carries a mounting 21 for a feed beam or guide 22 that is transverse to an axis II about which the feed beam can be rotated. This arrangement provides for a great freedom in the positioning of the feed beam adjacent concrete surfaces in various positions and not only road beds.
  • the feed beam 22 carries and guides a carrier 23 with four wheels and the carrier has a built-in motor with pinjons meshing with a rack 25 on the feed beam.
  • the carrier 23 has a holder 30 with a bifurcated lower portion 40 for two water jet nozzles 31,32 shown in figures 4-6.
  • the feed beam 22 has a protection hood 33 with a rubber shield 34 and the holder 30 extends down into the hood through a slot 35 formed by rubber sealings 36,37.
  • the holder 30 is swingable about an axis III by means of a hydraulic cylinder 27 so as to provide for a suitable angle of attack of the jets forwards in the carrier moving direction when the carrier moves in the one direction as well as in the opposite direction. Additionally, a motor 28 is arranged to oscillate the holder 30 about an axis IN transverse to the axis III in figure 5 and the central position of the holder 30 as well as its two end positions are indicated in figure 2.
  • Figure 4 shows in a perspective view and figure 5 in a side view the lower portion 40 of the holder 30 with the two nozzles 31 ,32.
  • This portion 40 is screwed to the main portion of the holder 30 and it is bifurcated into two branches 41 ,42 that have the two nozzles 31 ,32 screwed into their ends.
  • the nozzles are obliquely directed towards each other so that the jets ejected from them cross at a distance of for example 10 cm from the nozzles.
  • the jets are indicated as lines 50,51 in figure 5.
  • the branches 41 ,42 are somewhat twisted so that the jets cross but do not meet.
  • the difference in directions between the jets is shown as about 30 degrees in the plane of the paper in figure 5, that is, the angle v is about 30 degrees and it should be between 10 and 50 degrees or between 10 and 40 degrees or preferably between 20 and 40 degrees.
  • the nozzle holder 30,40 is oscillated in the plane of the paper in figure 5, that is, transverse to the feed beam 22, through an angle that should be between 6 and 20 degrees and preferably between 8 and 15 degrees.
  • the sum of half the angle v and half the oscillation angle should be at least 15 degrees and preferably at least 20 or 22 degrees.
  • the jets 50,51 will cut a comparatively wide path in the concrete because of the oscillation.
  • the entire machine is preferably stepped a step smaller than the width of the path so that the concrete is cut more than once.
  • the width of the path can for example be 15 cm and the steps can be less than half the width of the path, for example one third thereof the sweeps, sweeps.
  • the carrier 23 is moved in one direction along the feed beam with its nozzle holder 30 in an attack angle and the nozzle holder is oscillated transversely thereof at a high speed as compared with the speed of the carrier.
  • the carrier can for example move at a speed of 5-10 m/s and the oscillation frequency can for example be 40-400 double strokes per minute.
  • the entire machine is stepped forwards a step that is smaller than the path of cutting made by the oscillating jets and the nozzle holder 30 is swung back into an attack angle in the new sweeping movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Road Repair (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

A concrete cutting machine for remoting the upper layer of a concrete layer and free the outmost layer of reinforcement bars in the concrete, comprises a vehicle (11) with a transverse feed beam (22) that carries a carrier with two water jet nozzles (31, 32) mounted together on an elongated holder (30). The holder (30) is swingable about an axis transverse to the feed beam so as to provide for an angle of attack of the jets in both carrier moving directions when the carrier is reciprocated along the feed beam in concrete cutting sweeps. The holder (30) is also oscillated transverse to the feed beam. The angle between the jets is between (10 and 50) degrees as seen in the plane of oscillations and this provides for a freeing of the reinforcing rods whatever directions they have.

Description

A method and a machine for working a concrete surface
Field of the invention
This invention relates to a method of removing concrete from a concrete surface, for example to free the reinforcing bars in the road bed of a bridge, by ejecting a high pressure water jet from a nozzle that is kept close to the surface and reciprocated in parallel sweeps simultaneously with being oscillated transversely to the sweeping, and swinging the nozzle between the sweeps so that it is has an angle of attack in both sweeping movements.
The invention relates also to a machine for working a concrete surface down to the reinforcement of the concrete, comprising a vehicle on wheels having a transverse feed beam with a carriage that carries a water jet nozzle, where the nozzle is swingable about a first axis so as to give the jet an angle of attack in both directions when the carriage is reciprocated forth and back in working sweeps and swingable about a second axis so as to be oscillating in a plane transverse to feed beam.
Background of the invention
Road salting influences concrete road beds and the surface layer of road beds of concrete bridges need to be replaced after some years before the salt has penetrated down to the steel reinforcement; otherwise will the maintenance costs be very high. Therefore, one wants to remove the upper concrete layer to free the uppermost reinforcement layer and cast a new concrete surface layer before the uppermost reinforcement layer has been affected by the salt. Machines for such concrete removal are known for example by SE-451742-B, SE-508821-C, US- 5361993-A, US-4854770, and US-4753549-A and others. One wants to remove all concrete around the reinforcement bars, but there will often be some concrete left on the underside of the bars.
Object of invention and brief description of the invention
It is an object of the invention to provide a method and a machine that permit the reinforcing rods to be freed completely from the concrete, that is, also the underside of the rods should be free from concrete. This object is fulfilled in principle by the use of two nozzles that are jointly swept and oscillated while held in an angle to each other so that the ejecting jets impinge on the concrete at different angles as seen in the direction of oscillation. The above defined carriage carries two jet ejecting nozzles that are jointly swingable about said axes and has an angle between their jet directions that is between 10 and 50 degrees as seen in the direction of the oscillation.
Brief description of the drawings
• Figure 1 is a top plan view of a machine shown as an example of the invention.
• Figure 2 is a side view of the machine shown in figure 1.
• Figure 3 is a close-up view of the front part of figure 2.
• Figure 4 is an enlarged perspective view of a twin nozzle arrangements shown in figure 2.
• Figure 5 is a side view of the twin nozzle arrangement.
• Figure 6 is a view of the nozzles shown in figure 5 seen towards the front ends of the nozzles as indicated by line 6-6 in figure 4.
Description of the preferred embodiment shown as an example of the invention
The machine shown in figures 1-2 consists of a vehicle carried by two front wheels 12,13 with built-in motors 14,15 and two rear wheels 16,17 by which it can be steered. The machine has a pillar18 that is rotatable about an axis I and forms a guide for a carrier 20. The carrier 20 carries a mounting 21 for a feed beam or guide 22 that is transverse to an axis II about which the feed beam can be rotated. This arrangement provides for a great freedom in the positioning of the feed beam adjacent concrete surfaces in various positions and not only road beds.
The feed beam 22 carries and guides a carrier 23 with four wheels and the carrier has a built-in motor with pinjons meshing with a rack 25 on the feed beam. The carrier 23 has a holder 30 with a bifurcated lower portion 40 for two water jet nozzles 31,32 shown in figures 4-6. The feed beam 22 has a protection hood 33 with a rubber shield 34 and the holder 30 extends down into the hood through a slot 35 formed by rubber sealings 36,37.
The holder 30 is swingable about an axis III by means of a hydraulic cylinder 27 so as to provide for a suitable angle of attack of the jets forwards in the carrier moving direction when the carrier moves in the one direction as well as in the opposite direction. Additionally, a motor 28 is arranged to oscillate the holder 30 about an axis IN transverse to the axis III in figure 5 and the central position of the holder 30 as well as its two end positions are indicated in figure 2.
Figure 4 shows in a perspective view and figure 5 in a side view the lower portion 40 of the holder 30 with the two nozzles 31 ,32. This portion 40 is screwed to the main portion of the holder 30 and it is bifurcated into two branches 41 ,42 that have the two nozzles 31 ,32 screwed into their ends. The nozzles are obliquely directed towards each other so that the jets ejected from them cross at a distance of for example 10 cm from the nozzles. The jets are indicated as lines 50,51 in figure 5. As can be seen from figure 6, the branches 41 ,42 are somewhat twisted so that the jets cross but do not meet. The difference in directions between the jets is shown as about 30 degrees in the plane of the paper in figure 5, that is, the angle v is about 30 degrees and it should be between 10 and 50 degrees or between 10 and 40 degrees or preferably between 20 and 40 degrees. The nozzle holder 30,40 is oscillated in the plane of the paper in figure 5, that is, transverse to the feed beam 22, through an angle that should be between 6 and 20 degrees and preferably between 8 and 15 degrees. The sum of half the angle v and half the oscillation angle should be at least 15 degrees and preferably at least 20 or 22 degrees.
When the nozzle holder 30,40 is oscillated during a sweeping motion, in each sweep, the jets 50,51 will cut a comparatively wide path in the concrete because of the oscillation. Between the sweeps, the entire machine is preferably stepped a step smaller than the width of the path so that the concrete is cut more than once. The width of the path can for example be 15 cm and the steps can be less than half the width of the path, for example one third thereof the sweeps, sweeps.
The operation of the machine will now be described.
The carrier 23 is moved in one direction along the feed beam with its nozzle holder 30 in an attack angle and the nozzle holder is oscillated transversely thereof at a high speed as compared with the speed of the carrier. The carrier can for example move at a speed of 5-10 m/s and the oscillation frequency can for example be 40-400 double strokes per minute. In connection with the carrier reaching its turning point, the entire machine is stepped forwards a step that is smaller than the path of cutting made by the oscillating jets and the nozzle holder 30 is swung back into an attack angle in the new sweeping movement. By having two nozzles which give different attacking angle of the impinging jets, one will get a better freeing of the reinforcing rods irrespective of the directions of the rods in the concrete and also a good freeing at the crossing points of rods perpendicular to each other.

Claims

Claims
1. A method of removing concrete from a concrete surface, for example to free the reinforcing bars in the road bed of a bridge, by ejecting a high pressure water jet from a nozzle (31,32) that is kept close to the surface and reciprocated in parallel sweeps simultaneously with being oscillated transversely to the sweeping, and swinging the nozzle between the sweeps so that it is has an angle of attack in both sweeping movements, characterised in that two nozzles (31 ,32) are used, which are swept and oscillated together and kept at an angle to each other so that the jets (50,51) attack the concrete surface at different angles as seen in the direction of the oscillation, and the difference in angle is maintained fixed.
2. A method according to claim 1, characterised in that, during the oscillation, the difference in directions between the jets (50,51) is between 10 and 50 degrees as seen in the plane of oscillation.
3. A method according to claim 2, characterised in that the difference in directions between the jets is between 20 and 40 degrees as seen in the plane of oscillation.
4. A method according to any one of the preceding claims, characterised in that the two jets are oscillated together through an angle that is between 6 and 20 degrees.
5. A method according to claim 4, characterised in that the two jets are oscillated together through an angle that is between 6 and 15 degrees.
6. A method according to any one of the preceding claims, characterised in that the jets are directed towards each other.
7. A method according to claim 6, characterised in that the sum of half the difference in the direction between the two jets in the plane of oscillation and half the angle of oscillation is at least 15, preferably at least 22 degrees.
8. A method according to any one of the preceding claims, characterised in that a path of concrete is worked in each sweep by the jets of the two oscillating nozzles (31 ,32) and the nozzles are stepped between the sweeps a distance less than the width of the path.
9. A machine for working a concrete surface down to the reinforcement of the concrete, comprising a vehicle (11) having a transverse feed beam (22) with a carriage (23) that carries a water jet nozzle (31 ,32), where the nozzle is swingable about a first axis (I) so as to give the jet an angle of attack in both directions when the carriage is reciprocated forth and back in working sweeps and swingable about a second axis (II) so as to be oscillating in a plane transverse to feed beam, characterised in that the carriage (23) carries two nozzles (31 ,32), which are commonly swingable about said axes (1,11) and have a difference between their jet directions that is between 10 and 50 degrees as seen in the plane of oscillation.
10. Machine according to claim 7, characterised in that the difference between the jet directions of the two nozzles (31 ,32) is between 20 and 40 degrees as seen in the plane of oscillation.
EP02723016A 2001-04-09 2002-04-09 A method and a machine for working a concrete surface Expired - Lifetime EP1379734B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0101306 2001-04-09
SE0101306A SE521403C2 (en) 2001-04-09 2001-04-09 Concrete logging machine and ways to expose reinforcement in a concrete surface
PCT/SE2002/000736 WO2002081823A1 (en) 2001-04-09 2002-04-09 A method and a machine for working a concrete surface

Publications (2)

Publication Number Publication Date
EP1379734A1 true EP1379734A1 (en) 2004-01-14
EP1379734B1 EP1379734B1 (en) 2008-11-05

Family

ID=20283770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02723016A Expired - Lifetime EP1379734B1 (en) 2001-04-09 2002-04-09 A method and a machine for working a concrete surface

Country Status (6)

Country Link
EP (1) EP1379734B1 (en)
JP (1) JP4057918B2 (en)
AT (1) ATE413491T1 (en)
DE (1) DE60229731D1 (en)
SE (1) SE521403C2 (en)
WO (1) WO2002081823A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE525915C2 (en) * 2004-03-24 2005-05-24 Conjet Ab Concrete working machine has control unit for distribution valves in hydraulic lines of hydraulic motors, which is coupled to flow meters in other set of hydraulic lines of hydraulic motors
DE602005022111D1 (en) * 2005-01-05 2010-08-12 Aquajet Systems Holding Ab METHOD AND DEVICE FOR MOVING A RADIATOR
SE0801398L (en) 2008-06-16 2009-08-04 Conjet Ab Machine for machining a surface
SE1300085A1 (en) 2013-02-05 2014-04-15 Conjet Ab A unit for harvesting a surface with a high-pressure water jet
SE541458C2 (en) * 2016-02-29 2019-10-08 Conjet Ab Water spray unit and way of felling a surface
JP6493850B2 (en) * 2016-07-04 2019-04-03 樋口 幸弘 Road surface crushing method using water jet nozzle device and water jet nozzle device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4854770A (en) * 1984-04-16 1989-08-08 Indescor Hydrodynamics Inc. Method and apparatus for removal of surface material
US4753549A (en) * 1986-08-29 1988-06-28 Nlb Corporation Method and apparatus for removing structural concrete
SE508821C2 (en) * 1996-10-08 1998-11-09 Aquajet Systems Holding Ab Apparatus and method for moving an object and use in material removal processing of a material layer, in particular a concrete layer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02081823A1 *

Also Published As

Publication number Publication date
WO2002081823A1 (en) 2002-10-17
SE0101306L (en) 2002-10-10
JP2004524462A (en) 2004-08-12
JP4057918B2 (en) 2008-03-05
DE60229731D1 (en) 2008-12-18
SE521403C2 (en) 2003-10-28
ATE413491T1 (en) 2008-11-15
EP1379734B1 (en) 2008-11-05
SE0101306D0 (en) 2001-04-09

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