JP4057918B2 - Method and machine for processing concrete surfaces - Google Patents

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

  In the present invention, a high-pressure water jet is ejected from a nozzle that is held close to the surface and reciprocated in the parallel sweep direction and simultaneously oscillated transversely to the sweep direction, and has an angle of attack in the reciprocating sweep motion. Thus, the present invention relates to a method for removing concrete from a concrete surface, for example, in order to release a reinforcing bar of a bridge floor by swinging a nozzle for each sweep.

  The present invention is also a machine for treating a concrete surface up to a concrete reinforcement, including a wheeled vehicle having a traverse beam with a carriage carrying a water jet nozzle, where the nozzle is a carriage during processing sweep. The present invention relates to a machine capable of swinging around a first axis so as to give the jet an angle of attack in both directions when reciprocating back and forth, and swinging around a second axis so as to vibrate in a plane transverse to the feed beam. .

  Since salting on the road affects the concrete roadbed, it is necessary to replace the surface layer of the concrete bridge roadbed before salt penetrates into the steel reinforcement in a few years. If this is not done, maintenance costs will be very high. Therefore, before the uppermost reinforcement layer is affected by salt, the upper concrete layer must be removed to release the uppermost reinforcement layer and a new concrete surface layer must be driven. Machines for performing such concrete removal are known, for example, from SE-451742-B, SE-508821-C, US-5361993-A, US-4854770 and US-4753549-A.

  All the concrete around the reinforcing bars must be removed, but some concrete often remains on the underside of the reinforcing bars. It is an object of the present invention to provide a method and a machine that allows the reinforcing bars to be completely released from the concrete, i.e. to remove the concrete also from the underside of the reinforcing bars.

  The purpose is in principle to use two nozzles that sweep and vibrate together while being held at an angle with each other so that the jet jet strikes the concrete at different angles as seen in the direction of vibration. Achieved by: The above-mentioned carriage carries two jet injection nozzles, these jet injection nozzles can be swung together around the axis, and are 10 degrees to 50 degrees when viewed in the vibration direction. Has an angle between the injection directions.

In the attached drawing:
FIG. 1 is a plan view of a machine shown as an example of the present invention.
FIG. 2 is a side view of the machine shown in FIG.
FIG. 3 is an enlarged view of the front portion of FIG.
FIG. 4 is an enlarged perspective view of the twin nozzle arrangement shown in FIG.
FIG. 5 is a side view of the twin nozzle arrangement.
6 is a view of the nozzle shown in FIG. 5 as viewed toward the front end of the nozzle, as indicated by line 6-6 in FIG.

  The machine shown in FIGS. 1-2 comprises two front wheels 12, 13 with built-in motors 14, 15, and two steerable rear wheels 16, 17. The machine has a pillar 18 that is rotatable about an axis I, which forms a guide for the carrier 20. The carrier 20 carries a feed beam or guide 21 that is transverse to the axis II, which can rotate around the axis II. This arrangement provides great freedom in positioning the feed beam adjacent to any concrete surface as well as the road bed at various locations.

  The feed beam 22 carries and guides a carrier 23 having four wheels, which has a built-in motor with a pinion that meshes with a rack 25 on the feed beam. The carrier 23 has a holder 30 with a lid 40 divided into two parts for the two water jet nozzles 31 and 32 shown in FIGS. The feed beam 22 has a protective hood 33 with a rubber shield 34, and the holder 30 extends below the hood through a slot 35 formed by rubber seals 36,37.

  The holder 30 can be swung around the axis III by the hydraulic cylinder 27, and when the carrier moves in one direction and in the opposite direction, gives an appropriate angle of attack of the jet toward the front in the carrier moving direction. ing. Further, the motor 28 is arranged so as to vibrate the holder 30 about the axis IV in the direction transverse to the axis III in FIG. The center position of the holder 30 and its both end positions are shown in FIG.

  4 shows a lower part 40 of the holder 30 with two nozzles 31 and 32 in a perspective view, and FIG. 5 shows a lower part 40 of the holder 30 with two nozzles 31 and 32 in a side view. The lower part 40 is screwed into the main part of the holder 30 and is also divided into two branch parts 41 and 42 in which the two nozzles 31 and 32 are screwed into the ends. The nozzles are inclined to each other, and jets ejected from the nozzles intersect, for example, at 10 cm from the nozzles. The jets are indicated by straight lines 50 and 51 in FIG. As can be seen from FIG. 6, the branches 41 and 42 are somewhat twisted so that the jets intersect but do not collide. The direction difference between the jets is shown as about 30 degrees on the paper of FIG. That is, the angle v is about 30 degrees, which should be 10-50 degrees, or 10-40 degrees, or preferably 20-40 degrees. The nozzle holders 30, 40 are oscillated in the plane of FIG. 5, ie transverse to the feed beam 22, over an angle that must be 6-20 degrees, preferably 8-15 degrees. The sum of half of the angle v and half of the vibration angle must be at least 15 degrees, preferably at least 20 or 22 degrees.

When the nozzle holder 30, 40 is vibrated during the sweeping motion, each sweep causes the jets 50, 51 to cut a relatively wide path in the concrete due to vibration. Between sweeps, it is preferred that the entire machine be fed with a feed rate smaller than the width of the groove and cut the concrete more than once. The width of the groove may be, for example, 15 cm, and the feed amount may be smaller than half the width of the groove, for example, one third of the sweep.
The operation of the machine will be described below.

  The carrier 23 is moved in one direction along the feed beam with the nozzle holder 30 at a certain angle of attack. The nozzle holder is then vibrated laterally at a higher speed than the carrier speed. The carrier can move at a speed of, for example, 5 to 10 m / s, and the vibration frequency can be, for example, 40 to 400 reciprocating strokes per minute. When the carrier reaches its turning point, the entire machine is fed forward with a smaller feed rate than the groove cut by the oscillating jet, and the nozzle holder 30 is swung to the angle of attack in the new sweeping motion. By providing two nozzles that give the impinging jets different angles of attack, the reinforcement bars are released better regardless of the direction of the reinforcement bars in the concrete and at the intersection of reinforcement bars at right angles to each other. Will do.

It is a top view of the machine shown as an example of the present invention. It is a side view of the machine shown in FIG. It is an enlarged view of the front part of FIG. FIG. 3 is an enlarged perspective view of a twin nozzle arrangement shown in FIG. 2. It is a side view of twin nozzle arrangement. 6 is a view of the nozzle shown in FIG. 5 as viewed toward the front end of the nozzle, as indicated by line 6-6 in FIG.

Claims (10)

  A high pressure water jet is ejected from a nozzle (31, 32) held close to the surface, reciprocated in a parallel sweep direction and oscillated transversely to the sweep direction, and between the sweeps. The two nozzles (31, 32) are used in a method of removing concrete from the concrete surface to release the reinforcing bars by swinging the nozzle and allowing the nozzle to have a certain angle of attack in both sweep movements. These nozzles are swept and vibrated together and held at an angle to allow the jets (50, 51) to impinge on the concrete surface at different angles as seen in the direction of vibration. A method characterized by maintaining a constant value.   2. A method as claimed in claim 1, characterized in that during vibration, the direction difference between the jets (50, 51) is between 10 and 50 degrees as viewed in the vibration plane.   3. The method according to claim 2, wherein the direction difference between the jets is 20 degrees to 40 degrees when viewed in the vibration plane.   4. A method according to any one of claims 1 to 3, characterized in that the two jets are vibrated together over an angle of 6 to 20 degrees.   5. The method of claim 4, wherein the two jets are vibrated together over an angle of 6-15 degrees.   6. A method according to any one of the preceding claims, characterized in that the jets are oriented so as to face each other.   7. A method according to claim 6, characterized in that the sum of the half of the direction difference between the two jets in the vibration plane and the half of the vibration angle is at least 15 degrees, preferably at least 22 degrees.   A method according to any one of the preceding claims, wherein a concrete groove is machined between sweeps by a jet of two oscillating nozzles (31, 32), the nozzles being swept between sweeps. , Being fed over a distance less than the width of the groove.   A machine for treating a concrete surface up to a concrete reinforcement, comprising a vehicle (11) having a transverse beam (22) with a carriage (23) carrying a water jet nozzle (31, 32), the nozzle comprising: In the process sweep, when the carriage is reciprocated back and forth, it can oscillate about the first axis (I) to give the jet an angle of attack in both directions and oscillate in a plane transverse to the feed beam. In such a machine that can swing around the second axis (II), the carriage (23) carries two nozzles (31, 32), which are joined together around the axis (I, II). A machine characterized by being able to oscillate and at a constant angle to each other and having a difference between the jet directions of 10 to 50 degrees in the plane of vibration   10. A machine according to claim 9, wherein the difference in jet direction between the two nozzles (31, 32) is 20 to 40 degrees as seen in the vibration plane.

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