Concrete chopping device

Abstract

To efficiently suck drainage and cut pieces during cutting work by a water jet construction method.SOLUTION: A concrete chipping device 1 used in a water jet method includes a nozzle 6 that jets high-pressure water, a nozzle cover 9 that houses the nozzle 6 and has a housing chamber 11 that opens at an opening surface 9d of an end portion facing a surface to be chipped, and a sucking portion 15 that is provided in the nozzle cover 9 and connects a hose connected to a sucking device, the sucking portion 15 communicates with the housing chamber 11 at an end portion of the nozzle cover 9, and the sucking portion 15 opens at the opening surface 9d.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a concrete chipping device used in a water jet construction method. [Background technology]

[0002] A well-known method for chipping concrete is the water jet method, which sprays high-pressure water at the target. By setting the appropriate pressure and amount of water, the water jet method can remove only the areas that need chipping without causing microcracks or damaging the reinforcing bars. Regarding a concrete chipping device used in water jet construction, Patent Document 1 discloses a configuration that includes a water jet device that is supported on the top of a cover member and sprays high-pressure water toward the object to be chipped, and a suction means that connects to the interior of the cover member and sucks up drainage water and chipped concrete pieces. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-70082 Summary of the Invention [Problem to be solved by the invention]

[0004] When using water jetting to chip away at the surface, if wastewater or chipped debris is released, it can cause problems, such as a deterioration of the work environment and adverse effects on the surrounding area. In addition, if wastewater or chipped debris accumulates on the surface to be chipped, it can create resistance to the high-pressure water being sprayed toward the surface, reducing workability. Therefore, as in Patent Document 1, it is effective to provide a suction means for draining water and sucking up chipped pieces. Here, Patent Document 1 discloses a configuration in which a circular opening of a tubular member serving as suction means is arranged inside a cover member so as to face the surface to be chipped. However, in a configuration in which the circular opening of the pipe material is positioned within the cover member so as to face the surface to be ground, depending on the size of the opening and the distance between the opening and the surface to be ground, there is a risk that wastewater and ground debris may not be sucked in efficiently.

[0005] The present invention has been made in view of the above-mentioned points, and has as its object to make it possible to efficiently suck up wastewater and chipped pieces during chipping work using the water jet method. [Means for solving the problem]

[0006] The concrete chipping device of the present invention is a concrete chipping device used in water jet construction, and is equipped with a nozzle for spraying high-pressure water, a nozzle cover that houses the nozzle and has a storage chamber that opens at the opening surface of the end facing the surface to be chipped, and a suction part that is provided on the nozzle cover and to which a hose that leads to a suction device is connected, and is characterized in that the suction part is connected to the storage chamber at the end of the nozzle cover and the suction part opens at the opening surface. [Effects of the Invention]

[0007] According to the present invention, wastewater and chipped pieces can be efficiently sucked in during chipping work using the water jet method. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a concrete chipping device according to an embodiment. FIG. [Figure 2] FIG. 2 is a perspective view of the nozzle unit and its peripheral structure according to the embodiment, seen obliquely from above. [Figure 3] FIG. 2 is a perspective view of the nozzle unit and its peripheral structure according to the embodiment, as viewed obliquely from below. [Figure 4] 5A and 5B are diagrams illustrating a nozzle cover and a support plate according to the embodiment. [Figure 5] 5A and 5B are diagrams illustrating a nozzle cover and a support plate according to the embodiment. [Figure 6]FIG. 2 is a diagram showing a nozzle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a perspective view of a concrete chipping device 1 according to an embodiment. In this embodiment, the surface to be chipped is assumed to extend horizontally, and the direction in which the traveling rails 2 and the traverse rails 3 extend is taken as the horizontal direction, with the up and down directions being defined accordingly. As shown in Fig. 1, the concrete chipping device 1 includes left and right travel rails 2, a lateral travel rail 3 that is spanned between the left and right travel rails 2 and is capable of moving (traveling) along the travel rails 2, a vertical movement device 4 that is capable of moving (moving laterally) along the lateral travel rail 3, and a nozzle unit 5 supported by the vertical movement device 4. A motor, for example, is used as a drive source for movement along the travel rails 2 and the lateral travel rail 3. In this embodiment, two vertical movement devices 4 and nozzle units 5 are mounted side by side, but the number thereof is not limited.

[0010] The nozzle unit 5 and its peripheral structure will be described in detail below. Fig. 2 is a perspective view of the nozzle unit 5 and its peripheral structure seen obliquely from above. Fig. 3 is a perspective view of the nozzle unit 5 and its peripheral structure seen obliquely from below. The nozzle unit 5 includes a nozzle 6 that sprays high-pressure water and a drive unit 7 provided above the nozzle 6. The nozzle 6 is covered by a nozzle cover 9 (described later), and the drive unit 7 protrudes above the nozzle cover 9 and a support plate 10 (described later). As shown in FIG. 6 , the nozzle 6 includes two nozzle heads 6a and 6b and is supported by the drive unit 7 so as to be rotatable about an axis a extending in the vertical direction. The nozzle 6 is a collision-type nozzle, and controls the chipping depth by causing high-pressure water sprayed from the nozzle heads 6a and 6b to collide with each other. The drive unit 7 functions as a drive source for rotating the nozzle 6, rotating the nozzle 6 about the axis a. A hose connected to a high-pressure water generator (not shown) can be connected to the upper end of the drive unit 7. The drive unit 7 is provided with an inlet path (not shown) for introducing high-pressure water supplied from the high-pressure water generator into the nozzle 6. The nozzle unit 5 thus configured is fixed to a pair of arms 8 of the vertical movement device 4 and supported so as to be vertically movable.

[0011] The peripheral structure of the nozzle unit 5 includes a nozzle cover 9 that covers the nozzle 6 and a support plate 10 that supports the nozzle cover 9. Figure 4 shows the nozzle cover 9 and the support plate 10, with (a) being a plan view, (b) being a front view, and (c) being a bottom view. Figure 5 also shows the nozzle cover 9 and the support plate 10, with (a) being a perspective view seen from diagonally above, (b) being a side view, and (c) being a perspective view seen from diagonally below. The nozzle cover 9 is cylindrical with a circular ceiling surface 9a and side surfaces 9b, and has a cylindrical storage chamber 11 that opens at the bottom surface 9d. A hole 9c is formed in the center of the ceiling surface 9a, and the nozzle unit 5 is inserted into this hole 9c to store the nozzle 6 in the storage chamber 11. The center line C1 of the nozzle cover 9 coincides with the rotation axis a of the nozzle 6. In this way, the nozzle cover 9 stores the nozzle 6, and has the storage chamber 11 that opens at the opening surface at the end that faces the surface to be chipped, which in this embodiment is the opening surface (bottom surface) 9d at the lower end.

[0012] The nozzle cover 9 has a lower end provided with a bulging portion 12 that is partially bulged in the radial direction. The nozzle cover 9 has a flange 13 at its lower end, and a portion of the flange 13 bulges to form the bulging portion 12, so that the bottom surface 9d of the nozzle cover 9 has a generally elliptical shape, as shown in FIG. 4(c). As shown in FIGS. 3, 4(c), and 5(c), a wall 14 that conforms to the storage chamber 11 is provided at the base of the bulging portion 12 on the inside of the lower end of the nozzle cover 9. As a result, the storage chamber 11 is configured to be cylindrical even at the lower end of the nozzle cover 9 (where the bulging portion 12 is located).

[0013] A tubular suction section 15 is provided in the bulging section 12 of the nozzle cover 9. A hose connected to a suction device (not shown) is connected to the suction section 15. As shown in FIG. 5(b), the suction section 15 is disposed so that its axis A is inclined relative to the center line C1 of the nozzle cover 9. As shown in FIG. 4(a), the suction section 15 is disposed so that its axis A does not intersect with the center line C1 of the nozzle cover 9. As shown in FIGS. 4(c) and 5(c), the suction section 15 extends to the inside of the bulging section 12, and communicates with the storage chamber 11 at the lower end of the nozzle cover 9. The suction section 15 opens at the bottom surface 9d in the shape of a partial ellipse (opening 15a). The shape of the opening 15a corresponds to the shape obtained by cutting the tubular suction section 15 along the bottom surface 9d, assuming that the tubular suction section 15 extends beyond the bottom surface 9d. As shown in Figure 4(c), the opening 15a of the suction portion 15 configured in this manner is positioned to one side with respect to the center line C2 that passes through the top of the bulging portion 12 and intersects with the center line C1. For example, when the nozzle 6 rotates in the direction of arrow R in Figure 4(c), positioning the opening 15a in accordance with the rotation direction allows for more efficient suction of drainage water and chippings.

[0014] 3, a sealing member 16 made of synthetic rubber (for example, urethane rubber), which is an elastic material, is attached to the underside of flange portion 13 that forms the peripheral edge of bottom surface 9d of nozzle cover 9. Sealing member 16 is an annular member that has a substantially elliptical shape, just like bottom surface 9d of nozzle cover 9. When concrete chipping device 1 is in use, sealing member 16 on bottom surface 9d of nozzle cover 9 comes into contact with the surface to be chipped, forming an airtight space surrounded by storage chamber 11 of nozzle cover 9 and the surface to be chipped.

[0015] A synthetic rubber cover 17 is attached to the lower end of the nozzle cover 9. The cover 17 is circular and has a skirt-like shape that hangs down toward the periphery. A roughly oval hole 17a is provided in the center of the cover 17 to match the lower end of the nozzle cover 9, and the cover 17 is fixed so that the edge of the hole 17a rests on the flange portion 13. As shown in FIG. 3, a slit 17b that connects to the hole 17a is formed in the cover 17 to make it easier to attach and detach the nozzle cover 9. When the concrete chipping device 1 is in use, as shown in FIGS. 1 and 2, an auxiliary synthetic rubber cover 18 is placed on the cover 17 to cover the slit 17b and prevent the slit 17b from opening.

[0016] Next, the support plate 10 is a circular plate, and is disposed above the ceiling surface 9a of the nozzle cover 9. The support plate 10 is formed with a hole 10a corresponding to the hole 9c of the nozzle cover 9, and the nozzle unit 5 is inserted through this hole 10a. A pair of elongated holes 20 extending around the center of the support plate 10 are formed in the support plate 10. A pair of brackets 19 are fixed to the ceiling surface 9a of the nozzle cover 9. Bolts 21 inserted into the elongated holes 20 are fastened to the brackets 19, thereby supporting the nozzle cover 9 so that it is suspended from the support plate 10. By loosening the bolts 21 and rotating the nozzle cover 9 around its center line C1 relative to the support plate 10, the direction in which the suction part 15 extends can be changed, as shown in FIGS. 2(a) and 2(b), to make it easier to connect a hose leading to a suction device (not shown).

[0017] A pair of support portions 22 are erected on the upper surface of the support plate 10. Elongated holes 23 extending in the vertical direction are formed in the support portions 22. By fastening bolts 24 inserted into the elongated holes 23 to the arms 8 of the vertical movement device 4, the support plate 10 and the nozzle cover 9 supported by the support plate 10 are fixed to the pair of arms 8 of the vertical movement device 4 and supported so as to be movable up and down. Furthermore, by changing the fastening positions of the bolts 24 along the elongated holes 23, the height positions of the support plate 10 and the nozzle cover 9 can be adjusted. In this case, the height positions of the support plate 10 and the nozzle cover 9 can be adjusted independently of the nozzle unit 5 supported by the arms 8, and the relative height positions of the nozzle unit 5 and the nozzle cover 9 can be adjusted.

[0018] The vertical movement device 4 converts the rotation of the adjustment handle 25 into linear motion via a ball screw (not shown) to change the height position of the pair of arms 8. The vertical movement device 4 also has a dial gauge 26 that visibly displays the adjusted height position. The height position of the nozzle 6, i.e., the position of the nozzle 6 in the perspective direction relative to the surface to be chipped, has a significant effect on the chipping efficiency, so fine adjustments can be made while checking the dial gauge 26. The vertical movement device 4 corresponds to the adjustment mechanism referred to in this invention.

[0019] Hereinafter, with reference to FIG. 1, an example will be described in which the concrete chipping device 1 is used to break up concrete around an expansion joint 100 in repair or replacement work for an expansion joint 100 of a road bridge or the like. When crushing concrete around the expansion joint 100, the left and right travel rails 2 of the concrete chipping device 1 are installed so as to straddle the expansion joint 100. In other words, the left and right travel rails 2 are made parallel to the road width direction (extension direction of the expansion joint 100), and the part including the expansion joint 100 is positioned between them. Then, a hose connected to a high-pressure water generator (not shown) is connected to the upper end of the drive unit 7 of the nozzle unit 5, and a hose connected to a suction device (not shown) is connected to the suction part 15. The travel position and traverse position of the nozzle unit 5 are adjusted, and the height position of the nozzle unit 5 is adjusted by rotating the adjustment handle 25 of the up-down movement device 4.

[0020] When the setting is completed, the sealing member 16 on the bottom surface 9d of the nozzle cover 9 comes into contact with the surface to be chipped, forming a sealed space surrounded by the storage chamber 11 of the nozzle cover 9 and the surface to be chipped. In this state, a high-pressure water generator (not shown) is driven to spray high-pressure water from nozzle 6 to chip the concrete. By spraying high-pressure water while rotating nozzle 6 around axis a perpendicular to the surface to be chipped, a vortex is formed at the spray point, which prevents the formation of a water film around the spray point and improves chipping efficiency. In addition, a suction device (not shown) is driven to suck up the wastewater and chips with the suction unit 15. This prevents the wastewater and chips from flowing out, thereby preventing a deterioration in the work environment and adverse effects on the surrounding area. In addition, the wastewater and chips are prevented from accumulating on the surface to be chipped, preventing a decrease in workability.

[0021] By repeating this chipping operation while changing the forward and lateral positions of the nozzle unit 5, it is possible to break up the concrete around the expansion joint 100 across the entire width of the road. As shown in Figure 1, a synthetic rubber plate 27 may be placed behind the vehicle in the direction of travel. This prevents wastewater and chips from scattering even if they remain on the road surface. The synthetic rubber plate 27 may be connected to the traverse rail 3 via a wire 28, for example, so that it follows the movement of the traverse rail 3.

[0022] As described above, the suction unit 15 communicates with the storage chamber 11 at the lower end of the nozzle cover 9, and opens at the bottom surface 9d (opening 15a). With this configuration, the opening where the suction unit 15 communicates with the storage chamber 11 and the opening 15a at the bottom surface 9d serve as the suction port of the suction unit 15, making it possible to enlarge the suction port. Furthermore, the opening 15a at the bottom surface 9d can be brought closer to the surface to be chipped. This allows for efficient suction of drainage and chipped debris (improved recovery efficiency), and also reduces water pressure resistance by bringing the injection position of the high-pressure water closer to the surface to be chipped, improving the workability of the chipping operation.

[0023] Although the present invention has been described above with reference to the embodiments, the above embodiments are merely illustrative of specific examples of how the present invention can be implemented, and the technical scope of the present invention should not be construed as being limited by these embodiments. In other words, the present invention can be implemented in various forms without departing from its technical concept or main features. In this embodiment, the surface to be chipped is described as extending horizontally, but the surface to be chipped may also be a surface that extends vertically, such as a wall surface. In this case, the traveling rail 2 is installed upright on the wall surface. [Explanation of symbols]

[0024] 1: concrete chipping device, 4: vertical movement device, 5: nozzle unit, 6: nozzle, 9: nozzle cover, 9d: bottom surface, 11: storage chamber, 12: bulging portion, 13: flange portion, 15: suction portion, 15a: opening, 16: sealing member, 26: dial gauge

Claims

1. A concrete chipping device used in the water jet construction method, A nozzle for spraying high-pressure water; a nozzle cover having a storage chamber for storing the nozzle and opening at an opening surface at an end facing the surface to be chipped; a suction portion provided on the nozzle cover to which a hose leading to a suction device is connected, A concrete chipping device characterized in that the suction part communicates with the storage chamber at the end of the nozzle cover and the suction part opens at the opening surface.

2. The nozzle cover is cylindrical and has the cylindrical storage chamber, and the end portion is provided with a bulging portion that is bulged in a radial direction, The suction portion is provided in a tubular shape on the bulging portion, 2. The concrete chipping device according to claim 1, wherein the suction portion has an opening in the shape of a part of an ellipse at the opening surface.

3. The concrete chipping device according to claim 2, wherein the suction portion is disposed so that its axis is inclined with respect to the center line of the nozzle cover.

4. 4. The concrete chipping device according to claim 2, wherein the suction portion is disposed so that its axis does not intersect with the center line of the nozzle cover.

5. 3. The concrete chipping device according to claim 1, wherein a sealing member made of an elastic material is attached to the peripheral edge of the opening surface.

6. 3. The concrete chipping device according to claim 1, wherein the nozzle has two nozzle heads and is configured to rotate around an axis perpendicular to the surface to be chipped.

7. an adjustment mechanism for adjusting a position of the nozzle in a direction toward or away from the surface to be chipped; 3. The concrete chipping device according to claim 1, further comprising a dial gauge that visually displays the position adjusted by the adjustment mechanism.

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