JP7734393B2 - Pavement grinding device and pavement repair method - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies. (1) Test date: June 19, 2020 Test location: Taiemon Shinden, Chuo Ward, Niigata City, Niigata Prefecture Test conducted by: Heatlock Industrial Co., Ltd. (2) Document submission date: November 6, 2020 Documents submitted to: Japan Land and Infrastructure Research Center Document submitted by: Heatlock Industrial Co., Ltd. (3) Construction date: March 18-20, 2021 Construction location: Two locations: Tatsugashima, Chuo Ward, Niigata City, Niigata Prefecture, and Kamijo, Chuo Ward, Niigata City, Niigata Prefecture Construction conducted by: Nikko Road Co., Ltd.

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.

When repairing a deteriorated pavement, the surface of the deteriorated pavement must be removed and new pavement material applied. For example, a road surface milling device 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 case, the impact of the crushing force when scraping the pavement can cause some damage to the pavement, which can cause problems with the adhesion of the new pavement material.

In response to this, the 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, among others. The pavement grinding device described in these documents has a rotor with multiple abrasive pieces attached. 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. As a result, the pavement is smoothly scraped away. The pavement is not damaged, and new paving material adheres strongly to it.

Japanese Patent Application Laid-Open No. 2017-186793 JP 2015-214810 A

Some paved road surfaces are paved adjacent to structures made of concrete or other materials. For example, there are paved road surfaces that are paved adjacent to concrete curb blocks. In paved road surfaces adjacent to such structures, the pavement at the boundary with the structure can deteriorate, creating gaps between the structure and the pavement. Seeds can get into these 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 away and then filled with new paving material to fill the gaps. When grinding away paved road surfaces near structures, the paved road surface near the structure must be properly removed without damaging the structure. However, the surface grinding devices described in Patent Documents 1 and 2 have difficulty grinding paved road surfaces near structures.

The present invention aims to provide a pavement grinding device that can properly grind pavement surfaces near structures made of concrete or stone without damaging the structures, even when the pavement surfaces are laid in contact with the structures. It also aims to provide a pavement repair method that can properly repair pavement surfaces laid in contact with structures.

The present invention relates to a pavement 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 as the grinding body rotates, the path traced by the plurality of grinding pieces forms a cylindrical shape. If the path is imagined as a cylinder with the side surface as the cylindrical shape, the side surface of the grinding body will grind the pavement surface. In this invention, the grinding body is configured so that the end corresponding to the bottom of the cylinder does not protrude outward beyond the grinding piece located farthest from the vehicle when the grinding body rotates, so that there is no part that prevents the grinding body from approaching a concrete or stone structure when grinding the pavement laid adjacent to the structure .

According to the present invention, when the grinding body rotates and becomes cylindrical, there is no part at the end corresponding to the bottom of the cylinder that protrudes outward from the grinding chips. 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.

1 is a perspective view showing a paved road surface grinding device according to an embodiment of the present invention; 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 a perspective view of the drum constituting the grinding body, (C) is a perspective view of the grinding pieces, and (D) is a front view of the grinding body. 1A and 1B are diagrams illustrating a method for repairing paved road surfaces according to the present 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 a grinding body of a grinding device for grinding paved road surfaces according to the present embodiment, which grinds the deteriorated areas, and (C) is a cross-sectional front view showing the curb block and the repaired sidewalk.

This embodiment will now be described. As shown in Figure 1, the 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 (described below) can be raised and lowered, enabling the pavement surface to be ground.

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.

In this embodiment, the grinding body 12 is characterized by its placement and structure. As shown in Figure 2 (A), the grinding body 12 is placed on the side of the vehicle 2. To accommodate this placement, 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 placement, when the grinding body 12 grinds the paved road surface 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 paved road surface by grinding. Furthermore, because the grinding body 12 is attached to the side of the vehicle 2, the grinding body 12 can be placed as close as possible to the structure when grinding a paved road surface that is laid adjacent to a structure.

As shown in FIG. 1, the grinding body 12 of this embodiment is composed of a drum 18 and a plurality of grinding chips 19, 19, ... provided on the surface of this drum 18. As shown in FIG. 2(B), 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. 2(B) and (D). The shaft hole 22 is a hole into which the horizontal rotation shaft 11 is inserted. Although not shown in the figure, one end of the horizontal rotation shaft 11 has a cylindrical shape with portions of the shaft cut away from both side surfaces. When the end of the horizontal rotation shaft 11 formed in this way is inserted into the shaft hole 22, rotational force is transmitted without loss, just like a so-called keyed rotation shaft.

As shown in Figure 2 (C), the grinding pieces 19 attached to such drums 18 consist of legs 24 for attaching to the drum 18 and grinding sections 25 attached to these legs 24. The grinding sections 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 paved road surfaces stably over long periods of time.

As shown in Figures 1 and 2(D), the grinding body 12 of this embodiment has a plurality of grinding pieces 19, 19, ... fixed to the drum 18 by welding. The 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 overall. However, in order to suppress temperature increases due to frictional heat during cutting and to suppress the weight of the grinding body 12, the grinding pieces 19, 19, ... are spaced apart from one another on the drum 18.

As described above, this grinding body 12 is mounted on the horizontal rotation shaft 11. As shown in FIG. 1, the grinding body 12 is secured 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 it to secure the grinding body 12 to the horizontal rotation shaft 11. In this embodiment, both 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 further to the side than the grinding chip 19 located farthest from the vehicle 2. This is one of the features of the grinding body 12 in this embodiment.

Although not shown in Figure 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.

A method for repairing a paved road surface using the paved road surface grinding device 1 according to this embodiment is described below. 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 long-term exposure to wind and rain, and a gap 35 has formed between the curbstone block 30 and the paved road surface. Weeds 36 have grown in this gap 35. This roadway-side paved road surface 32 is to be repaired.

Weeds 36 are pulled out. Next, a grinding process is performed in which the gaps 35 are removed from the roadway-side pavement surface 32 by a predetermined width and depth using a grinding means. 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 grinding body 12 grinds the roadway-side pavement surface 32 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 positioned as close as possible to the curb block 30. This allows the roadway-side pavement surface 32 in contact with the curb block 30 to be ground to a specified 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, approximately 1 to 20 cm, and more preferably 3 to 10 cm.

The grooves 38 formed by grinding are filled with new paving material 39, as shown in Figure 3(C). 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.

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

In the repair method for repairing a pavement surface using the pavement surface grinding device 1 according to this embodiment, as explained with reference to Figure 3, the target of repair was the roadway-side pavement surface 32. However, the sidewalk-side pavement surface 31 can also deteriorate and can be repaired using a similar repair method. Furthermore, the structure that the pavement surface is in contact with is not limited to the curbstone blocks 30. For example, a concrete wall can also be used as a structure. Even if the pavement surface is paved in contact with a concrete wall, it can naturally be repaired by grinding the pavement surface near the concrete wall and backfilling 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 over a long period of time.

REFERENCE SIGNS LIST 1 Pavement surface grinding device 2 Vehicle 3 Grinding mechanism 5 Steering wheel 6 Front wheel 7 Rear wheel 9 Engine 11 Horizontal rotating shaft 12 Grinding body 14 Driving 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 surface 32 Roadway side pavement surface 35 Gap 36 Weeds 38 Groove 39 Paving material

Claims (4)

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 . The pavement surface grinding device described in claim 1, characterized in that the grinding pieces are formed by sintering a metal material containing diamond particles. 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. The method for repairing a paved road surface described in claim 3, wherein the structure is a concrete curb block and the paving material is composed of asphalt and aggregate.