JP4540031B2 - Rotating nozzle device for crushing concrete with water jet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforced concrete or concrete crushing apparatus using a water jet.
[0002]
[Prior art]
In general, in order to remove a deteriorated portion of reinforced concrete, a crushing means using a water jet is effective and widely used.
[0003]
In order to eliminate residues such as concrete behind the reinforcing bars, means for arranging a pair of nozzles for jetting a water jet in a state twisted in a radial direction with respect to a vertical line is a well-known technique.
[0004]
Furthermore, as a crushing device that eliminates concrete and other residues behind the reinforcing bars and enables the crushing grooves to form a rectangular cross section, a pair of nozzles that inject water jets are circumferentially oriented with respect to the vertical line. A technique is disclosed in which concrete or the like behind a reinforcing bar is crushed by the action of the torsional component, and the crushing groove forms a rectangular cross section. (For example, Japanese Patent No. 2644173)
[0005]
On the other hand, a technique in which water jets collide with each other is disclosed as a method for controlling the depth of crushing grooves of reinforced concrete and concrete. (For example, JP 2000-238032 A)
[0006]
[Problems to be solved by the invention]
In the method of twisting the nozzle for injecting the water jet in the circumferential direction with respect to the vertical line, when the swirling diameter of the nozzle is large, the crushing groove forms a substantially rectangular cross section. (φ100 to 300 mm), it is easily affected by the torsional component in the circumferential direction, and there is a case where there is a crushing groove so that it becomes a groove-like cross section and a rectangular cross section cannot be formed.
[0007]
Further, in the prior art, as shown in FIG. 8, the water jet WJ injected from the pair of nozzles 4 twisted in the radial direction by the twist angle θ intersects the concrete C with the points P1 and P2 and the rotation axis V. Since the distance A and the distance B are equal, that is, the pair of nozzles are arranged at the target position with respect to the rotation axis, the crushing trajectory by the water jet is the same, and the trajectory trace of the water jet is placed on the concrete crushing surface. However, it is difficult to form a crushing groove having a smooth and good surface that is required in recent years.
[0008]
Furthermore, in the method for controlling the crushing groove depth of the above-mentioned reinforced concrete and concrete, when it is necessary to increase the crushing groove depth, it is necessary to lower the collision point of the water jet injected from each nozzle. Further, it is necessary to increase the length of the arm portion (a member equivalent to 2a and 2b shown in FIG. 2) holding each nozzle, and the apparatus itself becomes large.
[0009]
The present invention has been proposed in view of the above-described problems of the prior art, and provides a rotating nozzle device for crushing concrete by a water jet capable of forming a crushing groove of concrete having a rectangular cross section. The main purpose is that.
[0010]
It is another object of the present invention to provide a nozzle device for crushing concrete with a water jet capable of forming a crushing groove having a smooth surface and a good surface trace by the water jet.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, the first nozzle and the second nozzle are arranged at positions eccentric from the rotation axis, and are crushed from the first nozzle and the second nozzle that circulate around the rotation axis. In a crushing rotary nozzle device that crushes reinforced concrete or concrete with a water jet sprayed toward the object,
The rotational axis, the first nozzle, and the second nozzle are arranged in a positional relationship that occupies each vertex of a triangle on a projection plane in the axial direction of the rotational axis,
The first nozzle is arranged in a direction in which the direction of the water jet to be injected follows the rotation direction of the circulation,
The second nozzle is arranged in a direction in which the direction of the water jet to be sprayed opposes the rotational direction of the circulation,
The injection axis of the first nozzle and the injection axis of the second nozzle are inclined toward each other in the direction toward the object to be crushed, toward the rotation axis ,
The crushing trajectory due to the water jet ejected from the first nozzle and the crushing trajectory due to the water jet ejected from the second nozzle do not coincide with each other.
[0012]
FIG. 4 shows the relationship between the crushing trajectory caused by the water jet ejected from the first nozzle and the rotation trajectory of the ejection port of the first nozzle in the present invention. Since the injection axis of the first nozzle and the injection axis of the second nozzle are decentered and inclined toward each other in the direction toward the object to be crushed, as shown in FIG. The crushing trajectory Da is always inside the rotation trajectory Dn of the injection port of the first nozzle. (It is clear that the second nozzle shows the same relationship and is not shown in FIG. 4.)
[0013]
Therefore, according to the present invention, the relationship of the trajectory shown in FIG. 4 can be maintained regardless of the nozzle turning diameter, so that the crushing groove has no practical nozzle turning diameter (φ100 to 300 mm). Since the crushing trajectory becomes a trajectory along Da even if it becomes deeper, the cross section of the crushing groove formed by the water jet can always form a rectangular cross section.
[0014]
According to a second aspect of the present invention, in the concrete crushing rotary nozzle device according to the first aspect, an eccentric distance of the first nozzle from the rotary shaft is an eccentricity of the second nozzle from the rotary shaft. The positional relationship is different from the distance.
[0015]
Therefore, according to the present invention, as shown in FIG. 3, the eccentric distance (distance between point X and point Y in FIG. 3) from the injection port of the first nozzle and the rotation shaft, and the injection of the second nozzle. If the eccentric distance (the distance between the point X and the point Z in FIG. 3) from the mouth and the rotation shaft is set differently in advance, the crushing trajectory by the water jet ejected from the first nozzle (FIG. 3). Da) and the crushing trajectory (Db in FIG. 3) due to the water jet ejected from the second nozzle are different, so that the crushing trace due to the water jet does not remain strongly and has a smooth and good surface. A crushing groove can be formed.
[0016]
According to a third aspect of the present invention, in the concrete crushing rotary nozzle device according to the first or second aspect, the first nozzle and the second nozzle are respectively horizontal from the arm portion and the tip of the arm portion. It is attached to the rotating shaft via an eccentric shaft portion extending in the direction.
[0017]
Therefore, according to the present invention, the positional relationship of all nozzles can be easily set by a combination of the lengths of the arm portion and the eccentric portion.
[0018]
According to invention of Claim 4, in the rotating nozzle apparatus for concrete crushing of any one of Claim 1 to 3, it becomes the structure which has two or more sets of the said 1st nozzle and 2nd nozzle. Yes.
[0019]
Therefore, according to the present invention, it is possible to draw a plurality of crushing trajectories of water jets ejected from a plurality of nozzles, so that the trajectory traces of the water jet can be further smoothed and have a good surface. A crushing groove can be formed.
[0020]
In this specification, the term “crushing” is not limited to crushing in a narrow sense, but also includes concepts such as cutting, cutting, and chipping.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In each figure, the part which attached | subjected the same code | symbol represents the part which is the same or corresponds.
[0022]
FIG. 1 shows an example of an apparatus for carrying out the present invention. A hollow shaft portion 1 constituting a flow path for supplying high-pressure water and ultrahigh-pressure water has hollow arm portions 2a and 2b that are also freely angular, and , Are connected to be twisted. The arm portions 2a and 2b are similarly connected to hollow eccentric shaft portions 3a and 3b. The eccentric shaft portions 3a and 3b are connected in a direction in which the nozzle 4b follows the rotational direction of rotation. The injection axis of each nozzle is attached so as to incline toward the rotation axis. Further, the nozzle 4a is twisted by θ _{1 in} the radial direction and the nozzle 4b is twisted by θ _{2 in the} radial direction so that the spray axis of the nozzle 4a and the nozzle 4b spray axis are directed toward the object to be crushed. Yes.
[0023]
The shaft portion 1 is connected to, for example, a rotary jet gun and rotates around the rotation axis V. The shaft 1 rotates around the nozzles 4a and 4b, and is directed in a direction substantially facing the rotation axis V (for example, The concrete is crushed while moving in the direction of the front and back in FIG.
[0024]
FIG. 2 is a front view of FIG. 1, and the lengths L1 and L2 of the arm portions 2a and 2b are arbitrarily adjusted by loosening the lock nuts 5a and 5b and replacing the arm portions 2a and 2b. it can, and, by loosening the lock nut 5a and 5b, the arm portions 2a and 2b, thereby making it possible twisting respectively to alpha ₁ and alpha ₂ directions.
[0025]
Further, since the lengths L1 and L2 of the arm portions of the nozzles 4a and 4b and the twist angles θ ₁ , θ ₂ , α ₁ , and α ₂ can be arbitrarily adjusted, water jets ejected from the nozzles 4a and 4b, respectively. The distances ra and rb from the point where the crossing with the concrete and the rotation axis V can be arbitrarily shifted. That is, the crushing trajectory of the water jet ejected from the nozzle 4a can be set different from the crushing trajectory of the water jet ejected from the nozzle 4b. As a result, while maintaining the crushing trajectory shown in FIG. 4, the concrete is crushed so that the crushing surface forms a rectangular cross section, and a crushing groove having a smooth and good surface can be formed. It becomes possible.
[0026]
FIG. 3 is a bottom view of FIG. 1, in which one point X of the rotation shaft, the center point Y of the injection port of the nozzle 4a, and the center point Z of the injection port of the nozzle 4b occupy each vertex of the triangle. In addition, the nozzles 4a and 4b are arranged. Further, the lengths E1 and E2 of the eccentric shaft portions 3a and 3b can be arbitrarily adjusted by loosening the lock nuts 5a ′ and 5b ′ and replacing the eccentric shaft portions 3a and 3b. Da and Db indicate the crushing trajectories due to the water jets ejected from the nozzles 4a and 4b, and when the lengths E1 and E2 of the eccentric shaft portions are adjusted to be different, the crushing trajectories Da and Db do not coincide with each other. It becomes a locus and produces the effect of forming a crushing groove having a smooth and good surface as described above.
[0027]
FIG. 5 is a fragmentary sectional view when the nozzle is in the position of FIG. Even when the concrete C has the reinforcing bar RB, the nozzles 4a and 4b are twisted in the radial direction by the twisting angles θ ₁ and θ ₂ , respectively, so that the water jet enters behind the reinforcing bar RB by the twisting component. be able to. Therefore, the concrete can be crushed without leaving the concrete residue behind the reinforcing bar RB.
[0028]
FIG. 7 shows a comparison between the water jets ejected from the first nozzle and the water jets ejected from the second nozzle in the positional relationship of the nozzles shown in FIGS. 3 and 6. . In FIG. 7, a point NP at which the water jet reappears represents a case where the positional relationship of the nozzles is in FIG. 3, and a point NP1 at which the water jet reappears represents a case where the positional relationship of the nozzles is in FIG. Yes.
[0029]
As shown in FIG. 7, the point at which the water jet re-approaches can be deepened from NP1 to NP simply by changing the nozzle from the position of FIG. 6 to the position of FIG. Can be done easily.
[0030]
Furthermore, since the re-approach point of the water jet can be deepened only by changing the position of the nozzle, the apparatus can be miniaturized.
[0031]
Further, since the arm portions 2a and 2b and the eccentric shaft portions 3a and 3b can be replaced as described above, and the mounting angles of the nozzles 4a and 4b can be arbitrarily adjusted as described above, Not only can the point NP that the jet is closest to be arbitrarily adjusted, but also the size of the apparatus can be reduced.
[0032]
Since the crushing efficiency of the water jet decreases near the point where the water jet reappears, it is preferable to arrange the nozzles at the positions shown in FIG. 3 when it is desired to increase the crushing depth.
[0033]
As for the method of adjusting the lengths of the arm portions 2a and 2b and the eccentric shaft portions 3a and 3b, not only the replacement method as described above, but also an adjustable member is used to adjust the length to an arbitrary length using a telescopic member. Of course, various modifications can be made without departing from the scope of the present invention.
[0034]
【The invention's effect】
As described above, according to the rotating nozzle device for reinforced concrete and concrete crushing by the water jet described in the present invention, the cross section of the crushing groove of the concrete can form a rectangular cross section, and the trajectory trace by the water jet is smooth. And, it is possible to obtain a concrete crushing groove that is good. In addition, the depth of the crushing groove can be easily controlled. Therefore, the excellent effect that the crushing quality of concrete can be improved and the work period can be shortened can be achieved. Further, since the apparatus can be reduced in size, it can contribute to 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 front view of FIG. 1;
FIG. 3 is a bottom view of FIG. 1;
FIG. 4 is a schematic diagram for explaining a relationship between a crushing trajectory by a water jet and a rotation trajectory of a nozzle.
FIG. 5 is a schematic view for explaining the action of removing the concrete residue behind the reinforcing bar according to the present invention.
FIG. 6 is a schematic diagram showing an embodiment of a nozzle position according to the present invention.
FIG. 7 is a schematic diagram for explaining a comparison of points at which a water jet approaches again.
FIG. 8 is a schematic diagram for explaining an action in which the trajectory of a water jet remains strong according to the prior art.
[Explanation of symbols]
1. . . Shaft portions 2a, 2b. . . Arm portions 3a, 3b. . . Eccentric shaft portions 4a, 4b. . . Nozzles 5a, 5a ', 5b, 5b'. . . Lock nut θ, θ _1, θ _2. . . Radial twist angles α ₁ , α ₂ . . . Torsion directions L1, L2. . . Arm lengths Da, Db. . . Crushing trajectory by water jet Dn. . . Nozzle rotation trajectory ra, rb. . . Distances E1, E2 from the point where the water jet intersects the concrete and the rotation axis V. . . Length of eccentric part C.I. . . Concrete RB. . . Reinforcing bar WJ. . . Water Jet V. . . Rotating shafts NP, NP1. . . Point where water jet is closest X. . . One point of rotation axis Y, Z. . . Center point of nozzle nozzle

Claims (4)

The first nozzle and the second nozzle are arranged at eccentric positions with respect to the rotation axis, and the reinforced concrete is formed by water jets that are jetted from the first nozzle and the second nozzle around the rotation axis toward the object to be crushed. Or in a crushing rotary nozzle device for crushing concrete,
The rotational axis, the first nozzle, and the second nozzle are arranged in a positional relationship that occupies each vertex of a triangle on a projection plane in the axial direction of the rotational axis,
The first nozzle is arranged in a direction in which the direction of the water jet to be injected follows the rotation direction of the circulation,
The second nozzle is arranged in a direction in which the direction of the water jet to be sprayed opposes the rotational direction of the circulation,
The injection axis of the first nozzle and the injection axis of the second nozzle are inclined toward each other in the direction toward the object to be crushed, toward the rotation axis ,
A concrete crushing rotary nozzle device, wherein a crushing trajectory by a water jet ejected from the first nozzle and a crushing trajectory by a water jet ejected from a second nozzle do not coincide with each other .  2. The concrete crushing rotary nozzle device according to claim 1, wherein an eccentric distance of the first nozzle from the rotary shaft is different from an eccentric distance of the second nozzle from the rotary shaft.  2. The first nozzle and the second nozzle are respectively attached to a rotating shaft via an arm part and an eccentric shaft part extending in a horizontal direction from the tip of the arm part. Or the rotation nozzle apparatus for concrete crushing of 2 or 2.  The rotary nozzle device for concrete crushing according to any one of claims 1 to 3, comprising a plurality of sets of the first nozzle and the second nozzle.

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