Pavement grinding device and pavement repair method

Abstract

To provide a pavement surface grinding machine capable of appropriately grinding a pavement surface laid in contact with a structure such as concrete.SOLUTION: A grinding machine comprises: a vehicle (2); a horizontal rotary shaft (11) with one end protruding from the side of the vehicle (2); and a grinding body (12) provided on the horizontal rotary shaft (11). The grinding body (12) is provided with a plurality of grinding pieces (19), and becomes a cylinder as a whole when rotating. The side surface of this cylinder cuts pavement surfaces. In the present invention, the grinding body (12) is configured such that the end corresponding to the bottom surface of the cylinder does not protrude outward from the grinding pieces (19) located farthest from the vehicle (2).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pavement surface grinding device that grinds the surface of a pavement surface when repairing a deteriorated pavement surface, and a pavement surface repair method. [Background technology]

[0002] When repairing a deteriorated pavement, it is necessary to remove the surface of the deteriorated pavement and then lay new pavement material. For example, a road surface milling machine equipped with a rotating body equipped with multiple cutter bits is well known as a device for removing the surface of a deteriorated pavement. The rotor rotates and the cutter bits strike the pavement, crushing the surface and removing the deteriorated pavement material. In this process, the impact of the crushing force during the grinding can cause some damage to the pavement, which can cause problems with the adhesion of the new pavement material.

[0003] In response to this, the present applicant has proposed a pavement grinding device that grinds the surface of a pavement by polishing it, as shown in Patent Documents 1 and 2, etc. The pavement grinding device described in these documents has a rotor equipped with multiple abrasive pieces. These abrasive pieces are sintered metal containing diamond particles. When the rotor rotates, the multiple abrasive pieces trace a cylindrical path. The side of this cylinder polishes, or grinds, the pavement surface. Therefore, the pavement surface is scraped off smoothly. The pavement surface is not damaged, and new paving material adheres strongly to it. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-186793 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-214810 Summary of the Invention [Problem to be solved by the invention]

[0005] Some paved road surfaces are paved adjacent to structures made of concrete or other materials. For example, there is a paved road surface that is paved adjacent to concrete curb blocks. In paved road surfaces adjacent to such structures, the pavement at the boundary with the structure may deteriorate, creating gaps between the structure and the pavement. Seeds may get into the gaps, allowing weeds to grow, making repairs necessary. To repair such paved road surfaces adjacent to structures, the paved road surface near the structure is ground and removed, and then new paving material is filled in to fill the gaps. When grinding and removing the paved road surface near the structure, it is necessary to properly remove the paved road surface near the structure without damaging the structure. However, the surface grinding devices described in Patent Documents 1 and 2 have difficulty grinding the paved road surface near the structure.

[0006] The present invention aims to provide a pavement grinding device that can properly grind the pavement near a structure made of concrete or stone without damaging the structure, and a pavement repair method that can properly repair a pavement that is laid in contact with a structure. [Means for solving the problem]

[0007] The present invention relates to a pavement surface grinding device comprising a vehicle that travels on a road surface, a horizontal rotating shaft mounted horizontally on the vehicle with one end protruding from the side of the vehicle, a motor or engine that drives the horizontal rotating shaft, and a grinding body that is mounted on one end of the horizontal rotating shaft and rotates integrally with the horizontal rotating shaft. The grinding body is provided with a plurality of grinding pieces, and when the grinding body rotates, the path drawn by the plurality of grinding pieces becomes cylindrical, and if you imagine a cylinder with the paths as its side, the side cuts the pavement surface. In this invention, the grinding body is configured so that when the grinding body rotates, the end that corresponds to the bottom of the cylinder does not have a portion that protrudes outward beyond the grinding piece located farthest from the vehicle, When cutting a paved road surface that is laid in contact with a structure made of concrete or stone with a grinding body, there should be no part that prevents access to the structure. Configure. [Effects of the Invention]

[0008] According to the present invention, when the grinding body rotates and becomes cylindrical, the end of the cylinder, which corresponds to the bottom, does not have a portion that protrudes outward from the grinding chip. Therefore, by bringing the bottom of the cylinder close to the structure, it is possible to grind the pavement surface right up to the structure without damaging it. This makes it easy to repair pavement surfaces that are in contact with structures. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a paved road surface grinding device according to an embodiment of the present invention; [Figure 2] 1A and 1B are diagrams showing a grinding device for paved road surfaces according to the present embodiment, in which (A) is a top view of the grinding device, (B) is an oblique view of the drum that constitutes the grinding body, (C) is an oblique view of the grinding pieces, and (D) is a front view of the grinding body. [Figure 3] FIG. 1 is a diagram illustrating a method for repairing paved road surfaces according to this embodiment, in which (A) is a cross-sectional front view showing a curb block and the deteriorated paved sidewalk in contact with it, (B) is a cross-sectional front view showing the deteriorated sidewalk and the grinding body of a grinding device for grinding paved road surfaces according to this embodiment, which grinds the deteriorated areas, and (C) is a cross-sectional front view showing the curb block and the repaired sidewalk. DETAILED DESCRIPTION OF THE INVENTION

[0010] This embodiment will now be described. As shown in Figure 1, a pavement grinding device 1 according to this embodiment comprises a vehicle 2 and a grinding mechanism 3 mounted on the vehicle 2. The vehicle 2 is relatively small and self-propelled by an engine (not shown). It is driven by operating a steering wheel 5. The vehicle 2 has two front wheels 6, 6 and two rear wheels 7. Although not shown in detail in Figure 1, the frame, or chassis, of the vehicle 2 is provided with a height adjustment mechanism for raising and lowering the vehicle height, and the front wheels 6 and rear wheels 7 are mounted via this height adjustment mechanism. By raising and lowering the vehicle height, the grinding mechanism 3, which will be described next, can be raised and lowered, enabling the pavement surface to be ground.

[0011] The grinding mechanism 3 includes an engine 9 mounted on the vehicle 2, a horizontal rotation shaft 11 mounted on the vehicle 2, and a grinding body 12 mounted on the horizontal rotation shaft 11. A drive pulley 14 is mounted on the engine 9, and a driven pulley 15 is mounted on the horizontal rotation shaft 11, with a V-belt 16 running between the drive pulley 14 and the driven pulley 15. Therefore, when the engine 9 is driven, the horizontal rotation shaft 11 rotates, causing the grinding body 12 to rotate.

[0012] In this embodiment, the grinding body 12 is characterized by its arrangement and structure. As shown in FIG. 2A, the grinding body 12 is arranged on the side of the vehicle 2. To accommodate this arrangement, one end of the horizontal rotation shaft 11 protrudes slightly from the side of the vehicle 2. The grinding body 12 is attached to this protruding end. Because of this arrangement, when the grinding body 12 grinds the pavement while the vehicle 2 is moving, the front wheels 6, 6 and rear wheels 7, 7 of the vehicle 2 can travel without getting caught in grooves formed in the pavement by grinding. Furthermore, because the grinding body 12 is attached to the side of the vehicle 2, when grinding a pavement laid adjacent to a structure, the grinding body 12 can be positioned as close as possible to the structure.

[0013] As shown in FIG. 1, the grinding body 12 according to this embodiment comprises a drum 18 and a plurality of grinding pieces 19, 19, ... provided on the surface of the drum 18. As shown in FIG. 2B, the drum 18 is a cylinder of a predetermined thickness with a bottom surface 21. The bottom surface 21 has a shaft hole 22, as shown in FIGS. 2B and 2D. The shaft hole 22 is a hole into which the horizontal rotating shaft 11 is inserted. Although not shown in the figure, one end of the horizontal rotating shaft 11 has a cylindrical shape with portions of the shaft cut out from both sides. When the end of the horizontal rotating shaft 11 thus formed is inserted into the shaft hole 22, torque is transmitted without loss, as with a so-called keyed rotating shaft.

[0014] As shown in Figure 2(C), the grinding pieces 19 attached to such drum 18 are composed of legs 24 for fastening to the drum 18 and grinding parts 25 attached to these legs 24. The grinding parts 25 are formed in an arc shape with a predetermined width, and the top of the arc grinds the paved road surface. The grinding pieces 19 are formed by sintering a metal material containing diamond particles. Therefore, they are resistant to wear and can grind the paved road surface stably over a long period of time.

[0015] 1 and 2(D), the grinding body 12 according to this embodiment has a plurality of grinding pieces 19, 19, ... fixed to the drum 18 by welding. The plurality of grinding pieces 19, 19, ... are arranged so that when the grinding body 12 rotates, the trajectory of each grinding piece 19, 19, ... forms a cylindrical shape as a whole. However, in order to suppress temperature rise due to frictional heat during cutting and to suppress the weight of the grinding body 12, the plurality of grinding pieces 19, 19, ... are provided at intervals from one another on the drum 18.

[0016] As described above, the grinding body 12 is mounted on the horizontal rotation shaft 11. As shown in FIG. 1, the grinding body 12 is fixed to the horizontal rotation shaft 11 by a nut 27. A male thread is formed on the end of the horizontal rotation shaft 11, and the nut 27 is threaded onto the male thread to fix the grinding body 12 to the horizontal rotation shaft 11. In this embodiment, the nut 27 and the end of the horizontal rotation shaft 11 on which the male thread is formed are completely housed within the drum 18. In other words, when the grinding body 12 rotates, there is no part that protrudes laterally beyond the grinding chip 19 located farthest from the vehicle 2. This is one of the features of the grinding body 12 according to this embodiment.

[0017] Although not shown in Fig. 1, such a grinding body 12 is provided with a cover, and the cover is equipped with a suction device for sucking up dust. Therefore, even if dust is generated when the grinding body 12 grinds the paved road surface, it does not pollute the surrounding environment.

[0018] A method for repairing a paved road surface using the paved road surface grinding device 1 according to this embodiment will be described. Figure 3(A) shows a curbstone block 30, a sidewalk-side paved road surface 31 that is paved in contact with the curbstone block 30, and a roadway-side paved road surface 32 that is also paved in contact with the curbstone block 30. The roadway-side paved road surface 32 has deteriorated due to exposure to wind and rain over a long period of time, and a gap 35 has formed between the roadway-side paved road surface 32 and the curbstone block 30. Weeds 36 are growing in this gap 35. This roadway-side paved road surface 32 is to be repaired.

[0019] Weeds 36 are pulled out. Next, a grinding process is performed in which a grinding means is used to grind away the gaps 35 from the roadway-side pavement surface 32 to a predetermined width and depth. Specifically, the process is as follows: As shown in FIG. 1, in the pavement grinding device 1 according to this embodiment, the engine 9 is driven to rotate the horizontal rotation shaft 11 and grinding body 12. The height of the front wheels 6, 6 and rear wheels 7, 7 is then adjusted using the height adjustment mechanism to lower the vehicle height. As shown in FIG. 3B, the grinding body 12 is brought into contact with the roadway-side pavement surface 32, i.e., grinding is performed. The vehicle 2 is driven while operating the handlebars 5 (see FIG. 1), and the roadway-side pavement surface 32 is ground by the grinding body 12, as shown in FIG. 3B. As described above, the grinding body 12 is designed so that no portion protrudes laterally beyond the grinding chips 19, 19 located farthest from the vehicle 2. This allows the grinding body 12 to be brought as close as possible to the curb block 30. This allows the roadway-side pavement surface 32 in contact with the curbstone block 30 to be ground to a predetermined width and depth. The width of the groove 38 formed by grinding is approximately equal to the width of the grinding body 12. The width of the grinding body 12 can be, for example, about 1 to 20 cm, and more preferably 3 to 10 cm.

[0020] As shown in Figure 3(C), the grooves 38 formed by grinding are filled with new paving material 39. This completes the repair of the paved road surface. Note that the paving material 39 can be a mixture of asphalt and aggregate, or concrete.

[0021] This embodiment can be modified in various ways. For example, the grinding body 12 has been described as being rotated and driven by the engine 9, but it may be driven by an electric motor. Also, the vehicle 2 has been described as having four wheels, but it may have three wheels, or five or more wheels. Furthermore, the vehicle 2 may be self-propelled by an electric motor.

[0022] In the pavement surface repair method using the pavement surface grinding device 1 according to this embodiment, as described with reference to FIG. 3, the target of repair was the roadway-side pavement surface 32. However, the sidewalk-side pavement surface 31 may also deteriorate and can be repaired using a similar repair method. Furthermore, the structure to which the pavement surface is in contact is not limited to the curbstone blocks 30. For example, a concrete wall may also be used as a structure. Even if the pavement surface is paved in contact with a concrete wall, it is possible to repair it by grinding the pavement surface near the concrete wall and backfilling it with new pavement material. Furthermore, a pavement material with excellent water-stopping properties can be used as the new pavement material 39 to backfill the grooves 38 formed by grinding. This makes it difficult for not only seeds but also water to enter, preventing the growth of weeds for a long period of time. [Explanation of symbols]

[0023] 1. Pavement grinding equipment 2. Vehicle 3 Grinding mechanism 5 Handle 6 Front wheels 7 Rear wheels 9 Engine 11 Horizontal rotating shaft 12 grinding body 14 drive pulley 15 Driven pulley 16 V-belt 18 Drum 19 Grinding chips 21 bottom surface 22 shaft hole 24 Leg 25 Grinding part 27 Nut 30 Curb Block 31 Sidewalk side pavement 32 Road side pavement 35 gap 36 weeds 38 Grooves 39 Paving materials

Claims

1. The grinding machine comprises a vehicle that travels on a road surface, a horizontal rotating shaft that is horizontally mounted on the vehicle and has one end that protrudes from a side of the vehicle, a motor or engine that drives the horizontal rotating shaft, and a grinding body that is mounted on the one end of the horizontal rotating shaft and rotates integrally with the horizontal rotating shaft, The grinding body is provided with a plurality of grinding pieces, and when the grinding body rotates, the trajectory drawn by the plurality of grinding pieces forms a cylinder, and when the trajectory is imagined as a cylinder with the trajectory as its side, the side cuts the pavement surface, and the end of the cylinder corresponding to the bottom surface does not have a part that protrudes outward beyond the grinding piece located farthest from the vehicle, so that when the grinding body is used to cut a pavement laid in contact with a structure made of concrete or stone, there is no part that prevents the grinding body from getting close to the structure.

2. 2. The pavement grinding device according to claim 1, wherein the grinding pieces are formed by sintering a metal material containing diamond particles.

3. A repair method for repairing a pavement surface in the vicinity of a structure made of concrete or stone, the method comprising the steps of: The grinding device comprises a vehicle that travels on a road surface, a horizontal rotation shaft that is mounted horizontally on the vehicle and has one end that protrudes from the side of the vehicle, a motor or engine that drives the horizontal rotation shaft, and a grinding body that is mounted on the one end of the horizontal rotation shaft and rotates integrally with the horizontal rotation shaft, the grinding body having a plurality of grinding pieces that, when the grinding body rotates, trace a cylindrical path drawn by the plurality of grinding pieces, and when the path forms the side of a cylinder, the side cuts the paved road surface, and the end of the cylinder that corresponds to the bottom surface does not have a portion that protrudes outward beyond the grinding piece located farthest from the vehicle, so that when the grinding body is used to cut the paved road surface near the structure, there is no portion that prevents the grinding body from getting close to the structure, The repair method includes a grinding step of grinding the paved road surface near the structure with the grinding body to a constant width and a constant depth from the structure; a filling step of filling the grooves formed by the grinding step with paving material.

4. 4. The method for repairing a paved road surface according to claim 3, wherein the structure is a curb block made of concrete, and the paving material is made of asphalt and aggregate.

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