JP2000238032A - Cutting method by water jet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to highly accurately execute cutting, chipping or the like irrespective of the dispersion in the strengths of mattes to be cut by a method wherein the cutting by a nozzle jet with a certain width is executed by moving a collision point in a swinging locus under the condition that both the collision angle between nozzles and the inclination angle of a plane including the nozzles and the collision point to a vertical plane, both of which have been made variable, are set in advance. SOLUTION: Chipping is executed by moving a swinging center 1a under the state that a branch tube 2 is swung on a shaft 1a. A collision point 6 swung by a swinging angle ϕ from a collision point 5 on the swinging shaft 1a by drawing a locus through the swinging of the branch tube 2, resulting in allowing to effectively remove the mortar at the leg part of coarse aggregate with a jet in such a manner that a wedge is driven in the leg part. The energy of the jet nearly disappears at the collision point 6, resulting in making the depth of chipping constant. The removal of the mortar at the back part of a reinforcing bar is executed by locking the pivoting of the shaft 1a so as to fix the direction of the branch tube 2 in order to execute by lockingly moving the collision point 5 of the jet below the shaft 1a by a desired locking width. Thus, the chipping work, which exposes the reinforcing bar, can be executed efficiently by a highly assumable depth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting method for cutting an object to be cut, such as concrete, by jetting water jets from a pair of nozzles at a predetermined angle so as to collide with each other.

[0002]

2. Description of the Related Art A technique is known in which a water jet is jetted from a pair of nozzles at a fixed angle so as to collide with each other to cut the ground under the ground.
JP-A-09786 and JP-A-9-273146 have the advantage that the cutting distance is constant. However, these technologies drill the ground and cannot cut a structure or the like.

[0003] Further, there is known a technique of cutting a structure to disassemble the structure by, for example, a water jet or an abrasive jet (for example, see Japanese Patent Application Laid-Open No. 7-127284).

When cutting an object to be cut with a water jet, the cutting depth is determined by [injection pressure × injection flow rate] which is input energy per unit length or unit area.

[0005] However, when the strength of the object to be cut differs from place to place like a building material, the cutting depth differs. In the case of reinforced concrete, undulation occurs, and concrete particularly behind the reinforcing steel remains.

[0006] These problems can be alleviated by adjusting the nozzle and adjusting the jet angle of the water jet. However, even if the jet angle of the water jet is adjusted, there is a possibility that undulation may occur at the cut or suspended portion.

Further, in cutting, it is also possible to set the depth by the input energy. However, when setting the cutting depth based on the input energy, the accuracy is not high because of the variation in strength due to the workpiece.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and has a simple structure, regardless of the strength variation of the workpiece.
An object of the present invention is to provide a cutting method that enables cutting, hanging, and the like to be performed with high accuracy.

[0009]

According to the present invention, there is provided a cutting method for cutting a workpiece by jetting water jets from a pair of nozzles at a fixed angle so as to collide with each other. And a nozzle device for varying the inclination angle of a plane including the nozzle and the collision position with the vertical surface, and setting the collision angle and the inclination angle in advance, and rotating the axis of the nozzle device while rotating the nozzle device. In this case, the collision point is moved in a turning trajectory, and the workpiece is cut with a constant width by using the circumferential direction component and the radial direction component of the jet from the nozzle.

Further, according to the present invention, in a cutting method for cutting a workpiece by jetting water jets from a pair of nozzles at a fixed angle so as to collide with each other,
Prepare a nozzle device that can change the collision angle of those nozzles and the inclination angle that the plane including the nozzles and the collision position forms a vertical plane, set the collision angle and the inclination angle in advance, and support a pair of nozzles The hole is cut by rotating the shaft.

According to the present invention, there is provided a cutting method for cutting a workpiece by jetting water jets from a pair of nozzles at a predetermined angle so as to collide with each other.
An axis, a branch pipe extending in both directions perpendicular to the axis, another branch pipe rotatably provided to the branch pipe, and a nozzle rotatable in a direction opposite to the other branch pipe. Is prepared, the collision angle and the inclination angle are set in advance, and the axis of the nozzle device is moved in one direction while rotating, so as to cut the workpiece with a constant width. .

Further, according to the present invention, in a cutting method for cutting a workpiece by jetting water jets from a pair of nozzles at a fixed angle so as to collide with each other, the collision angle of the nozzles, the nozzles and Prepare a nozzle device that can change the inclination angle that the plane including the collision position forms with the vertical surface, set the collision angle and the inclination angle in advance, fix the axis of the nozzle device so as not to rotate, and keep it constant. It is designed to cut a certain depth by moving it while swinging the width.

Accordingly, the cutting depth can be controlled by setting the collision angle between the pair of nozzles. That is, at the collision point of the impinging jet, the energy held by the water jet constituting the impinging jet is substantially dissipated by the collision between the jets. Therefore, cutting is no longer performed at a location deeper than the collision point.

Further, the nozzle device may be moved in a zigzag manner when implementing the present invention.

As described above, according to the present invention, it is possible to form a cut portion having a fixed width and a work to be cut, and to obtain a cut surface having relatively few irregularities. Also, the lower side of a reinforcing bar or the like can be cut.

In the present specification, the term “cutting” is:
This includes not only cutting and cutting but also operations or concepts such as hanging, breaking and crushing.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the accompanying drawings, similar members are denoted by similar reference numerals.

FIG. 1 shows an example of an apparatus for practicing the present invention. One end 1b of a shaft 1a of a hollow shaft 1 constituting a flow path for supplying high-pressure water is connected to a branch pipe 2 formed of a pipe. The ends 2a and 2b of the branch pipe 2 are provided with nozzles 3 and 4 for jetting water jets 3a and 4a, respectively.

The water jets 3a, 4a jetted from the nozzles 3, 4 are configured to collide at a collision point 5 at a collision angle θ. In other words, the water jets 3a, 4a constitute a collision jet.
Here, as shown by reference numeral 5a, the water jet after the collision disappears as a jet that has almost dissipated its energy.

FIG. 2 is a perspective view as viewed in the direction of arrow A in FIG. 1. The shaft 1a is configured to rotate through a rotary joint 1c, and the end of a branch pipe 2 to which a nozzle 3 is attached. 2a is rotatably mounted and the nozzle 4
The end 2b of the branch pipe 2 to which is attached is also rotatably mounted, and the collision point swing angle, that is, the inclination when moving the collision point 5 to the collision point 6 with respect to the axis 2A of the branch pipe 2 The branch pipe ends 2a, 2b having the nozzles 3a, 4a are rotatable in the same direction by an angle φ.

The embodiment will be described below with reference to FIGS.

FIG. 3 shows a branch pipe 2 with the axis 1a as the center of rotation.
This shows an aspect in which the swing center 1a is moved in the direction B while turning, and the hanging is performed. B in FIG.
Referring to FIG. 4 showing an arrow, the turning shaft 1a has a swing angle φ.
The collision point 6 swayed from the upper collision point 5 follows the trajectory indicated by 6a by turning of the branch pipe 2, and (in a wall surface not shown, for example), the circumferential component V of the jet flow
With c and the radial component V, the mortar of the legs of the coarse aggregate can be effectively removed like driving a wedge. Then, since the energy of the water jet is almost dissipated at the collision point 6, the fishing depth is constant at the collision point 6, and a highly accurate fishing can be performed.

FIG. 5 shows a state in which a conical hole is being drilled while the shaft 1a is the turning axis of the branch pipe 2, and FIG. 6 shows that the shaft 1a is the turning axis of the branch pipe 2 and the shaft 1a is revolving ( The illustrated example shows a mode in which a truncated conical hole is excavated in a spiral shape.

FIGS. 7 to 9 show examples in which the mortar behind the reinforcing bar is removed. In each case, the rotation of the shaft 1a is locked to fix the direction of the branch pipe 2, and the collision point 5 of the water jet is determined. Below the axis 1a, a method is shown in which mortar on the back of the main rebar is removed while swinging as indicated by R between desired widths gh. Here, FIG. 7 shows that the direction of the main rebar is X
FIG. 8 shows the case where the direction of the main reinforcing bar is Y, and FIG.
Indicates a case where the reinforcing bars have the same diameter in the X and Y directions. At this time, only in the case of FIG. 9, the branch pipe 2 is inclined by 45 degrees with respect to the traveling direction of the shaft, and in other cases (cases of FIGS. 7 and 8), the branch pipe 2 is moved forward of the shaft. Perpendicular or parallel to the direction.

In the manner described above, the mortar behind the reinforcing bar at the collision point 5 of the water jet can be removed to a certain depth.

FIG. 10 shows an embodiment for excavating a groove.
The rotation of the shaft 1a is locked, the branch pipe 2 is fixed in the direction of the groove 10, and the shaft 1a is moved in the direction C, which is the direction of excavation of the groove, to excavate the groove. Collision point 5
May be controlled.

FIG. 12 and FIG.
A specific embodiment of a nozzle unit which is a member composed of a shaft 1a, a branch pipe 2, and nozzles 3, 4 is shown. A first branch pipe 21, 21 is rotatable at a joint portion 11a of the shaft 1a. , A second branch pipe 22 is rotatably connected to the first branch pipe 21 through a first joint 23, and a second branch pipe 22 is connected to an end of the second branch pipe 22. Member 25 rotatably connected about the axis of branch pipe 22
And a nozzle 26 rotatably connected to the member 25 to form a joint that can freely select a swing angle φ and a collision angle θ and that can be freely ejected. Here, the symbol W indicates a water circuit, and N indicates a nut.

FIG. 13 shows an example of fixing means for fixing the joint at a desired angle. The taper ring 27 is configured to be pushed into the branch pipe 21 and fixed by the nut N, for example. Reference numeral 30 denotes an O-ring, 31
Indicates a backup ring.

FIGS. 14 to 17 show examples of a method of adjusting the collision angle θ and the collision point swing angle φ when the above-described nozzle unit is used. Here, FIG. 14 shows a case where the distance R in the radial direction from the shaft 1a to the nozzle 26 is free and the collision angle θ is adjusted only by the first joint 23. FIG. 15 shows a case where the swing angle φ is mainly adjusted by the nozzle 26. FIG. 16 shows a case where the radial distance R is mainly adjusted by the first joint 23. Further, FIG. 17 shows a case where the collision angle θ is mainly adjusted by adjusting the nozzle angle, and the swing angle φ is also adjusted at the same time.

It is needless to say that the present invention is not limited to the above-described operation, but can be applied to a wide variety of applications by applying the nozzle unit.

[0031]

As described above, the present invention is constructed as described above, and can precisely control the hanging and cutting depth by the water jet, so that the hanging work for exposing the reinforcing bar can be accurately performed, and the peeling work of the outer wall tile can be performed. Work using water jets, such as cutting of mortar and rebar for joining rebars, can be performed efficiently and at a high precision depth, which can contribute to shortening of construction period and cost reduction. .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is a perspective view showing a mode of a hanging operation using the apparatus of FIG. 1;

FIG. 4 is a view for explaining the operation of FIG. 3;

FIG. 5 is a diagram showing a mode of excavating a conical hole with the apparatus of FIG. 1;

FIG. 6 is a diagram showing a mode of excavating a truncated conical hole with the apparatus of FIG. 1;

FIG. 7 is a diagram showing a first mode of hanging a mortar on the back of a reinforcing bar.

FIG. 8 is a view showing a second mode of hanging the mortar on the back of the reinforcing bar.

FIG. 9 is a diagram showing a third mode of hanging a mortar on the back of a reinforcing bar.

FIG. 10 is a perspective view showing a mode of excavating a groove in a mortar by the apparatus of FIG. 1;

FIG. 11 is a plan view showing a specific example of a nozzle unit.

FIG. 12 is a side view of FIG. 11;

FIG. 13 is a view exemplifying a cross section of a joint part.

FIG. 14 is a view for explaining the operation of adjusting the collision angle of the nozzle unit of FIG. 11;

FIG. 15 is a view for explaining the operation of adjusting the swing angle of the collision point by the nozzle unit of FIG. 11;

FIG. 16 is a view for explaining the operation of adjusting the radius from the axis to the nozzle in the nozzle unit of FIG. 11;

FIG. 17 is a view for explaining the operation of adjusting the collision angle and the swing angle with the nozzle unit of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shaft part 1a ... Shaft 2 ... Branch pipe 3, 4 ... Nozzle 5, 6 ... Collision point 21 ... First branch pipe 22 ... Second branch pipe 23 ... First joint 27 ... Tapered ring

Claims (4)

[Claims] 1. A cutting method for cutting a workpiece by jetting water jets from a pair of nozzles at a predetermined angle so as to collide with each other, and a plane including a collision angle of the nozzles and the nozzles and a collision position. Prepare a nozzle device that can change the inclination angle that forms a vertical plane, set the collision angle and the inclination angle in advance, and rotate the axis of the nozzle device in one direction while rotating to rotate the collision point A cutting method characterized in that a workpiece is moved along a locus, and a workpiece is cut with a constant width using a circumferential component and a radial component of a jet from a nozzle. 2. A cutting method for cutting a workpiece by jetting water jets from a pair of nozzles at a constant angle so as to collide with each other, and a plane including a collision angle of the nozzles and the nozzles and a collision position. Preparing a nozzle device capable of changing the inclination angle that forms a vertical plane, setting the collision angle and the inclination angle in advance, and rotating a shaft supporting a pair of nozzles to cut a hole. Method. 3. A cutting method for cutting a workpiece by injecting water jets from a pair of nozzles at a fixed angle so as to collide with each other, comprising: a shaft and a branch pipe extending in both directions perpendicular to the shaft. A nozzle device provided with another branch pipe rotatably provided with respect to the branch pipe and a nozzle rotatable in a direction opposite to the other branch pipe is prepared, and the collision angle and the inclination angle are prepared. A cutting method characterized in that it is set in advance and is moved in one direction while rotating the axis of the nozzle device to cut an object to be cut with a constant width. 4. A cutting method for cutting a workpiece by jetting water jets from a pair of nozzles at a constant angle so as to collide with each other, and a plane including a collision angle of the nozzles, the nozzles and a collision position. Prepare a nozzle device that can change the inclination angle that forms a vertical plane, set the collision angle and the inclination angle in advance, fix the axis of the nozzle device so as not to rotate, and swing a fixed width. A cutting method characterized by cutting while cutting a fixed depth.