Road skid resistance restoration device and road skid resistance restoration method

Abstract

To provide a road skid resistance restoration device and a road skid resistance restoration method that can uniformly restore the skid resistance value of a road surface while suppressing noise and dust generation and reducing environmental load.SOLUTION: A road skid resistance restoration device (100) includes a laser light irradiation part (30) that irradiates a road surface (G) with laser light (L), and an irradiation position change part (40) that changes the irradiation position on the road surface (G) where the laser light (L) is irradiated.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a road skid resistance restoration device and a road skid resistance restoration method. [Background technology]

[0002] Conventionally, test courses with low skid resistance (μ value) of road surfaces have been used for the purpose of testing the driving performance of moving objects such as automobiles and for training driving techniques in special situations. These test courses are equipped with a structure in which the road surface is covered with tiles with low μ value in order to reproduce conditions such as puddles on the road surface, frozen road surfaces, and packed snow conditions (see, for example, Patent Documents 1 to 3).

[0003] Conventional low-μ road tiles are made by melting basalt and pouring it into a mold. By sprinkling water on these tiles, a low slip resistance (μ value) of less than 0.4 is achieved. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3064774 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-290915 [Patent Document 3] Japanese Patent Application Laid-Open No. 2005-240305 Summary of the Invention [Problem to be solved by the invention]

[0005] Such test courses with low road skid resistance have the problem that the surface condition of the road changes due to wear caused by the running of test vehicles, deterioration over time, etc., which causes the skid resistance value (μ value) to change. Therefore, methods such as spraying chemicals on the road surface of test courses where the skid resistance value has changed are used to adjust the surface condition of the road so that the desired skid resistance value is achieved.

[0006] However, mechanical grinding of the road surface inevitably generates noise and scatters dust, necessitating the installation of separate noise and dust control measures. Furthermore, spraying chemicals on the road surface can make it difficult to evenly spray chemicals on areas due to road surface slopes or unevenness, making it difficult to maintain a consistent skid resistance across the entire test course. Furthermore, chemicals sprayed on the road surface seep into the ground, which can require soil restoration work depending on the type of chemical, resulting in increased environmental impact.

[0007] The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide a road surface skid resistance restoration device and a road surface skid resistance restoration method that can uniformly restore the skid resistance value of a road surface while suppressing noise and dust generation and reducing the environmental load. [Means for solving the problem]

[0008] In order to solve the above problem, the road surface skid resistance recovery device of the present invention is characterized by comprising a laser light irradiation unit that irradiates laser light onto a road surface, and an irradiation position change unit that changes the irradiation position on the road surface where the laser light is irradiated.

[0009] In the road surface skid resistance restoration device of the present invention, laser light is irradiated onto the road surface from the laser light irradiation unit, and the irradiation position is changed by the irradiation position change unit, so that the road surface can be uniformly blasted with laser light, suppressing the generation of noise and dust and reducing the environmental load, while uniformly restoring the skid resistance value of the road surface.

[0010] In one aspect of the present invention, the laser beam irradiation device further includes a frame portion that holds the laser beam irradiation portion and the irradiation position changing portion, and caster portions that mount the frame portion so that it can be moved on the road surface.

[0011] In one aspect of the present invention, the irradiation position changing unit moves the laser light irradiation unit within a plane parallel to the road surface.

[0012] In one aspect of the present invention, the irradiation position changing unit changes the irradiation position at a constant speed.

[0013] In one aspect of the present invention, the intensity of the laser light emitted by the laser light emitting unit is in the range of 10 W or more and 500 W or less.

[0014] In one aspect of the present invention, the laser light emitted by the laser light emitting unit is pulsed and has a frequency in the range of 10 kHz to 500 kHz.

[0015] In one aspect of the present invention, a dust collection unit that sucks dust is provided, and a dust collection nozzle of the dust collection unit is disposed between the laser light irradiation unit and the irradiation position.

[0016] In one aspect of the present invention, the laser light irradiation unit has a light scanning unit that irradiates the laser light onto the road surface with an amplitude W, and the distance that the irradiation position changing unit moves in one go is half the amplitude W.

[0017] In addition, in order to solve the above problem, the road surface skid resistance restoration method of the present invention is characterized by comprising a laser light irradiation process for irradiating a road surface with laser light, and an irradiation position change process for changing the irradiation position on the road surface where the laser light is irradiated. [Effects of the Invention]

[0018] The present invention provides a road surface skid resistance restoration device and a road surface skid resistance restoration method that can uniformly restore the skid resistance value of a road surface while suppressing noise and dust generation and reducing environmental load. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic perspective view showing an overview of a road skid resistance restoration device 100 according to a first embodiment. [Figure 2] 1 is a schematic side view showing an overview of a road skid resistance restoration device 100. FIG. [Figure 3]1 is a schematic top view showing an overview of a road skid resistance restoration device 100. FIG. [Figure 4] 1 is a graph showing the measurement results of μ values ​​using a skid resistance measurement vehicle. [Figure 5] 1 is a graph showing the change in μ value before and after treatment with the skid resistance recovery method of the present invention. [Figure 6] 10 is a graph showing the change in μ value due to a rotation labeling test. [Figure 7] FIG. 10 is a schematic perspective view showing an overview of a road skid resistance restoration device 110 according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] (First embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing will be assigned the same reference numerals, and redundant explanations will be omitted where appropriate. FIG. 1 is a schematic perspective view showing an overview of a road surface skid resistance restoration device 100 according to this embodiment. As indicated by the arrows in FIG. 1, the width direction (lateral direction) of the road surface skid resistance restoration device 100 will be referred to as the X-axis direction, the length direction (front-rear direction) as the Y-axis direction, and the height direction as the Z-axis direction.

[0021] 1, the road surface skid resistance restoration device 100 includes a control unit 10, a frame unit 20, a laser light emitting unit 30, and an irradiation position changing unit 40. The road surface skid resistance restoration device 100 adjusts the skid resistance value μ of the road surface G by irradiating the irradiation position of the road surface G with laser light L (not shown) from the laser light emitting unit 30 while the irradiation position changing unit 40 changes the irradiation position of the laser light L, thereby performing a laser blasting process that forms minute scratches on the surface of the road surface G.

[0022] The road surface G is the target to be subjected to laser blasting treatment by irradiating it with laser light L from the laser light irradiation unit 30. As mentioned above, the road surface G may be a low μ road surface on a test course, or more specifically, a ground surface covered with tiles. The material constituting the surface of the road surface G is not limited, and may be porcelain, ceramic, asphalt, concrete, metal, or the like.

[0023] The control unit 10 controls the irradiation of the laser light L from the laser light irradiation unit 30 and the driving of the irradiation position changing unit 40. The control unit 10 also has a built-in laser light source for emitting the laser light L, and the laser light L guided through the optical fiber unit 34 (described later) is irradiated from the laser light irradiation unit 30. The configuration of the control unit 10 is not limited, but examples include a central processing unit (CPU) for performing information processing, a memory device, a recording medium, an information communication device, etc. The control unit 10 controls the laser light irradiation unit 30 and the irradiation position changing unit 40, which are objects to be controlled, according to a predetermined program. While FIG. 1 shows an example in which the control unit 10 is configured as a single device, the part controlling the laser light irradiation unit 30 and the part controlling the irradiation position changing unit 40 may be configured as separate devices. Furthermore, the control unit 10 may be configured by connecting multiple information processing devices so that they can communicate with each other and working together.

[0024] The frame unit 20 forms the outer shape of the road surface skid resistance restoration device 100 and is a part that holds the laser light irradiation unit 30 and the irradiation position changing unit 40. While Fig. 1 shows an example in which the outer shape of the road surface skid resistance restoration device 100 is formed only by the frame unit 20, a housing unit may be attached to the frame unit 20 to hide the interior and prevent the laser light L from leaking outside the device and the scattering of dust. The specific structure and material of the frame unit 20 are not limited, but one example is a structure in which aluminum pipes or the like are connected by a joint member.

[0025] The laser light irradiation unit 30 is a part that irradiates the road surface G with laser light L. As described above, the laser light source that oscillates the laser light L is built into the control unit 10, and the laser light L guided by the optical fiber unit 34 is irradiated onto the road surface G. Although FIG. 1 shows an example in which the laser light source is built into the control unit 10, it may also be built into the laser light irradiation unit 30. There are no specific limitations on the laser light source, but infrared light using a known fiber laser or ultraviolet light using a semiconductor laser can be used.

[0026] The laser light L emitted from the laser light emitting unit 30 is preferably pulsed in the range of 10 kHz to 500 kHz. The laser light L emitted from the laser light emitting unit 30 preferably has an output in the range of 10 W to 500 W. By using pulsed laser light L with the above frequency and output, it is possible to effectively continue the laser blasting process while suppressing deterioration of the road surface G due to temperature rise.

[0027] The irradiation position changing unit 40 is a part that changes the irradiation position on the road surface G where the laser light L is irradiated. FIG. 1 shows an example of a two-axis Cartesian robot as the irradiation position changing unit 40, which is equipped with an electric actuator extending in the X-axis direction and the Y-axis direction and moves the laser light irradiator 30 in an XY plane parallel to the road surface G. When the irradiation position changing unit 40 moves the laser light irradiator 30 in the XY plane, it is preferable that the distance between the road surface G and the laser light irradiator 30 be within a predetermined range. The specific configuration of the irradiation position changing unit 40 is not limited, and as long as it is possible to change the irradiation position of the laser light L in the XY plane direction of the road surface G, a configuration in which the laser light L is reflected by a reflecting mirror to scan the irradiation position in the XY plane may be used.

[0028] Furthermore, it is preferable that the irradiation position changing unit 40 change the irradiation position of the laser light L on the road surface G at a constant speed. The speed at which the irradiation position is changed is not limited, but is preferably in the range of 10 mm / sec to 600 mm / sec. Changing the irradiation position at a speed lower than these numerical ranges is undesirable because the laser blasting process will cause too many micro-scratches to be formed on the surface of the road surface G, resulting in an excessively high skid resistance value. Furthermore, changing the irradiation position at a speed higher than these numerical ranges may narrow the range of skid resistance values ​​(μ values) that can be restored by the laser blasting process, making it difficult to ensure uniformity in the skid resistance values ​​(μ values).

[0029] Fig. 2 is a schematic side view showing an overview of the road surface skid resistance restoration device 100. Fig. 3 is a schematic top view showing an overview of the road surface skid resistance restoration device 100. As shown in Figs. 2 and 3, the road surface skid resistance restoration device 100 has a frame unit 20 to which caster units 21 are attached. The laser light irradiation unit 30 includes an irradiation head unit 31, a main body unit 32, a holding unit 33, and an optical fiber unit 34. The irradiation position changing unit 40 includes a Y-axis slide unit 41, an X-axis slide unit 42, and a support unit 43.

[0030] The caster unit 21 is attached to the lower part of the frame unit 20 and is a part that supports the frame unit 20 so that it can be moved on the road surface G. The specific configuration of the caster unit 21 is not limited as long as it is movable on the road surface G, and a movable caster having wheels that can rotate in the XY plane can be used. In addition, the caster unit 21 preferably includes a stopper unit (not shown) that switches between a movable state in which the frame unit 20 can be moved on the road surface G and a stationary state in which the frame unit 20 is stopped on the road surface G. When the stopper unit is in the stationary state, the frame unit 20 can be stopped at a predetermined position on the road surface G, and a predetermined area on the road surface G can be used as a treatment area for laser blasting treatment. In addition, when the stopper unit is in a movable state, the frame unit 20 can be moved from a treatment area that has been subjected to laser blasting treatment in the stationary state to select a different treatment area. Therefore, multiple treatment areas can be moved to sequentially perform laser blasting treatment on a wide area.

[0031] The irradiation head unit 31 is a part for irradiating the road surface G with laser light L from the laser light irradiation unit 30. The irradiation head unit 31 may incorporate an optical component such as a lens to adjust the spot diameter and focal length of the laser light L. The laser light L is irradiated with a predetermined spot diameter at a predetermined focal length according to the characteristics of the optical component included in the irradiation head unit 31, forming fine scratches on the surface of the road surface G. Furthermore, the laser light L irradiated from the irradiation head unit 31 is preferably tilted at a predetermined angle θ from the perpendicular direction to the irradiation position on the road surface G. As an example, θ can be in the range of 5 degrees to 30 degrees. By tilting the laser light L at the predetermined angle θ, the irradiation position of the laser light L can be more easily seen from above the road surface skid resistance restoration device 100 during the laser blasting process.

[0032] Furthermore, although the optical characteristics of the irradiation head unit 31 are not limited, the distance between the irradiation head unit 31 and the irradiation position on the road surface G is preferably in the range of 10 mm to 600 mm, and more preferably 100 mm to 300 mm. If the distance from the road surface G is smaller than this range, dust generated from the road surface G by the laser blasting process may adhere to the irradiation head unit 31, making it difficult to continue irradiating the laser light L. Furthermore, if the distance from the road surface G is larger than this range, vibrations that occur when the irradiation head unit 31 is moved, etc., will cause a large deviation in the irradiation position of the laser light L, making it difficult to uniformly adjust the skid resistance value (μ value).

[0033] The spot diameter of the laser light L at the irradiation position on the road surface G is not limited, but may be, for example, in the range of 0.01 mm to 1 mm. Furthermore, the irradiation head unit 31 may further include an optical scanning unit that scans the laser light L in a predetermined direction, thereby giving the irradiation range of the laser light L a predetermined width. The scanning period of the light by the optical scanning unit may be, for example, 1 Hz to 50 Hz, and the scanning amplitude W may be, for example, 10 mm to 200 mm.

[0034] Here, if the amplitude of the laser light L scanned by the optical scanning unit is W and the amplitude direction is the Y-axis direction, then when the laser light irradiation unit 30 is moved once by the X-axis slide unit 42, the laser blasting treatment can be performed on an area having a width of the amplitude W in the Y-axis direction. In this case, after one movement of the X-axis slide unit 42 is completed, it is preferable to move the Y-axis slide unit 41 by W / 2 so that the area already laser blasted and the area to be newly laser blasted overlap by half. In this way, moving the Y-axis slide unit 41 by half the amplitude W ensures reliable and uniform laser blasting. The amount of movement of the Y-axis slide unit 41 may be other than W / 2, and may even be W.

[0035] The main body 32 is a part that holds the irradiation head 31 and the optical fiber 34 and ensures an optical connection between them. One end of the holding part 33 is attached to the main body 32, and the main body 32 is held by the holding part 33 on the irradiation position changing part 40. The structure and shape of the main body 32 are not limited as long as the mechanical connection and optical connection between the optical fiber 34 and the irradiation head 31 can be ensured even when the laser light irradiation part 30 is moved by the irradiation position changing part 40.

[0036] The holding unit 33 is a part that holds the main body unit 32 by suspending it from the irradiation position changing unit 40. The holding unit 33 may be provided with an angle adjustment unit that adjusts the angle of the main body unit 32 with respect to the road surface G. Here, an example has been shown in which the main body unit 32 and the irradiation head unit 31 are held in a suspended state below the irradiation position changing unit 40 using the holding unit 33, but the structure and position of the holding unit 33 are not limited as long as it does not interfere with the irradiation of the laser light L from the irradiation head unit 31 to the road surface G.

[0037] The optical fiber unit 34 is a part that transmits the laser light L from the control unit 10 to the irradiation head unit 31. The optical fiber unit 34 is flexible and in the form of a cable having a predetermined length. The specific configuration of the optical fiber unit 34 is not limited, and it is possible to use one in which multiple optical fibers are bundled together to form a single cable and the periphery is covered with a coating material. The length of the optical fiber unit 34 is not limited, and it is preferable that the length be several tens to several hundreds of meters in order to cover the construction range from the control unit 10 to the road surface G.

[0038] The Y-axis slide section 41 is disposed extending in the Y-axis direction and is an electric actuator that moves the X-axis slide section 42 along the Y-axis (length direction). The X-axis slide section 42 is disposed extending in the X-axis direction and is an electric actuator that moves the laser light irradiation section 30 along the X-axis (length direction). One end of the X-axis slide section 42 is attached to the Y-axis slide section 41, and the other end is provided with a support section 43. The support section 43 is attached to the other end of the X-axis slide section 42 and is disposed slidably on the frame section 20.

[0039] Because one end of X-axis slide section 42 is attached to Y-axis slide section 41, X-axis slide section 42 is moved in the front-to-back direction as Y-axis slide section 41 is driven. Furthermore, laser light emitting section 30 is moved in the left-to-right direction as X-axis slide section 42 is driven. At this time, because the other end of X-axis slide section 42 is disposed on frame section 20 by support section 43, the positions of X-axis slide section 42 and laser light emitting section 30 in the height direction (Z-axis direction) are maintained even if the position of laser light emitting section 30 changes. Furthermore, by controlling section 10 driving X-axis slide section 42 and Y-axis slide section 41, the irradiation position of laser light L irradiated from laser light emitting section 30 can be scanned within the XY plane.

[0040] In the skid resistance restoration method of this embodiment, first, in a work position determination step, the worker moves the road surface skid resistance restoration device 100 to a predetermined position on the road surface G using the movable caster units 21, and switches the caster units 21 to a stopped state. Next, in a laser light irradiation step, the worker operates the control unit 10 to irradiate the road surface G with laser light L from the laser light irradiation unit 30. In addition, an irradiation position change step is executed in parallel with the laser light irradiation step, and the control unit 10 drives the Y-axis slide unit 41 and the X-axis slide unit 42 to move the irradiation position of the laser light L within the XY plane. By repeating the laser light irradiation step and the irradiation position change step, the movable range of the irradiation position can be used as the treatment area, and laser blasting can be performed on the treatment area.

[0041] After performing the laser blasting treatment on the treatment area, the worker switches the caster unit 21 to a movable state to change the position of the road surface skid resistance restoration device 100, and then performs the work position determination step, laser light irradiation step, and irradiation position change step again at another position. By repeating this process, it is possible to perform the laser blasting treatment on multiple treatment areas, perform uniform laser blasting over a wide area, and adjust the skid resistance value of the entire road surface G.

[0042] (Example) Using the road skid resistance restoration device 100 described above, laser blasting treatment was performed by the skid resistance restoration method on a low-μ road surface on a test course whose skid resistance had decreased due to aging. A fiber laser with a wavelength of 1064 nm was used as the laser light source. The laser light L emitted from the laser light irradiation unit 30 was pulsed light with an irradiation intensity of 200 W and a frequency of 200 kHz. The distance between the irradiation head unit 31 and the irradiation position on the road surface G was 250 mm, and the spot diameter of the laser light L at the irradiation position was 0.08 mm. The irradiation head unit 31 was equipped with an optical scanning unit, and the irradiation range was set to a frequency of 30 Hz and an amplitude of 100 mm, and the movement amount of the Y-axis sliding unit 41 per movement was 50 mm. The movable range of the Y-axis sliding unit 41 was 100 cm, the movable range of the X-axis sliding unit 42 was 75 cm, and the area of ​​the treatment area was 0.75 m. 2 It was decided.

[0043] In Examples 1 to 3, the moving speed of the laser light irradiation unit 30 by the X-axis slide unit 42 was set to 45 mm / sec, 70 mm / sec, and 115 mm / sec, respectively. Therefore, the time required to perform laser blasting on one treatment area was approximately 6.1 minutes, approximately 4.1 minutes, and approximately 2.7 minutes in Examples 1 to 3, respectively. Here, if the time required to move the road surface skid resistance restoration device 100 to an adjacent treatment area is set to 2 minutes, then the time required to perform laser blasting on one treatment area was approximately 6.1 minutes, approximately 4.1 minutes, and approximately 2.7 minutes in Examples 1 to 3. 2 The time required to restore the slip resistance by performing laser blasting on the surface of the concrete in Examples 1 to 3 was approximately 18 hours, approximately 14 hours, and approximately 10 hours, respectively.

[0044] For Examples 1 to 3, the slip resistance value (μ value) of the road surface G was measured using a skid resistance measurement vehicle before (before recovery treatment), after (after recovery treatment), and after grinding with a rubber grindstone (after accelerated grinding) using the skid resistance recovery method using the road surface skid resistance recovery device 100 under the above-mentioned conditions. The slip resistance value was measured using a skid resistance measurement vehicle according to a method in accordance with ASTM E 1337.

[0045] The skid resistance measuring vehicle applies braking by placing the measuring wheel attached to the body of the measuring vehicle on the road surface to be measured while the measuring vehicle is traveling at a constant speed, and the skid friction resistance force generated between the tire and the road surface at that time is detected by a load cell.

[0046] In the rubber grindstone polishing, a rubber grindstone is attached to a floor polisher and rotated on the road surface G after the restoration treatment. In this example, a rotational labeling test (based on "Pavement Survey and Testing Method Handbook B002, Labeling Test Method") is used to reproduce a road surface equivalent to 500,000 runs with a normal tire, and the slip resistance value is measured. Next, by determining the floor polisher rotation speed when the same slip resistance value is reproduced by the rubber grindstone polishing, a road surface equivalent to 500,000 runs with a normal tire is reproduced by the rubber grindstone polishing.

[0047] Figure 4 is a graph showing the results of measuring μ values ​​using a skid resistance measuring vehicle. The horizontal axis represents the slip ratio, and the vertical axis represents μ values. In the graph, the dashed line represents the measured value before the recovery treatment, the dashed line represents the measured value after the recovery treatment, and the solid line represents the measured value after the accelerated polishing. Figure 4 shows the measurement results for Example 3. The peak value of the measurement results in Figure 4 was approximately 0.2 before the recovery treatment, approximately 0.28 after the recovery treatment, and approximately 0.25 after the accelerated polishing.

[0048] Figure 5 is a graph showing the change in μ value before and after treatment with the slip resistance recovery method of the present invention. The horizontal axis in the graph represents the values ​​before recovery treatment, after recovery treatment, and after accelerated polishing, and the vertical axis represents the peak μ value shown in Figure 4. Example 1 was measured once, and Examples 2 and 3 were each measured twice. The black circle and two-dot chain line in the graph represent the measurement results of Example 1. The black circle and solid line represent the first measurement results of Example 2, and the white circle and one-dot chain line represent the second measurement results of Example 2. The white circle and solid line represent the first measurement results of Example 3, and the black circle and dashed line represent the second measurement results of Example 3. The horizontal dashed lines in the graph represent the target range of slip resistance values.

[0049] 5, in Example 1, the peak μ value is larger than the target slip resistance value both after the recovery treatment and after the accelerated polishing. This is thought to be because the moving speed of the X-axis slide part 42 is slow at 45 mm / sec, and the number, depth, length, etc. of scratches formed on the surface of the road surface G are too large.

[0050] In contrast, in Examples 2 and 3, the peak μ value fell within the target range of skid resistance in all measurements, both after restoration treatment and after accelerated polishing. Therefore, it was confirmed that the road surface skid resistance restoration device 100 and skid resistance restoration method of this example can restore the skid resistance value to an appropriate range.

[0051] Figure 6 is a graph showing the change in μ value due to the rotational labeling test. The horizontal axis of Figure 6 represents the number of tire runs, and the vertical axis represents the skid resistance value (BPN). In Figure 6, the measurement results for Example 3 are shown by white circles and a solid line, and the measurement results for the recovery treatment using a chemical agent are shown by black circles and a dashed line for comparison.

[0052] As shown in Figure 6, when the number of tire runs is 0, the comparative example has a higher slip resistance value than Example 3, but as the number of tire runs increases, the slip resistance of the comparative example becomes smaller than that of Example 3. Therefore, it can be seen that the road surface skid resistance restoration device 100 and skid resistance restoration method of this example can maintain an appropriate slip resistance value for a longer period of time than restoration treatments using conventional chemicals.

[0053] As described above, in the road surface skid resistance restoration device 100 of this embodiment, laser light L is irradiated onto the road surface G from the laser light irradiation unit 30, and the irradiation position is changed by the irradiation position change unit 40, so that the road surface G is uniformly blasted with the laser light L, thereby suppressing the generation of noise and dust, reducing the environmental load, and uniformly restoring the skid resistance value of the road surface G.

[0054] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 7. Description of content that overlaps with the first embodiment will be omitted. FIG. 7 is a schematic perspective view showing an overview of a road surface skid resistance restoration device 110 according to this embodiment. As shown in FIG. 7, the road surface skid resistance restoration device 110 includes a control unit 10, a frame unit 20, a laser light irradiation unit 30, an irradiation position changing unit 40, and a dust collection unit 50.

[0055] The dust collection unit 50 is a part that sucks in dust generated by the laser blasting process of the road surface G with the laser light L. The dust collection unit 50 also includes a dust collection nozzle 51 and a dust discharge unit 52. The dust collection unit 50 is attached to the laser light irradiation unit 30, and is moved within the XY plane together with the laser light irradiation unit 30 in accordance with the operation of the irradiation position changing unit 40.

[0056] The dust collection nozzle 51 is disposed between the laser light irradiation unit 30 and the irradiation position, and functions as an intake port for sucking in dust generated during the laser blasting process. By extending the dust collection nozzle 51 below the irradiation head unit 31 of the laser light irradiation unit 30 and positioning it between the irradiation head unit 31 and the road surface G, it is possible to suck in the dust generated during the laser blasting process before it reaches the irradiation head unit 31. Furthermore, by positioning the tip of the dust collection nozzle 51 close to the road surface G, it is possible to effectively suck in the dust generated during the laser blasting process before it scatters and discharge it from the dust discharge unit 52.

[0057] The distance between the tip of the dust collection nozzle 51 and the road surface G is not limited, but is preferably in the range of 50 mm to 200 mm. If the dust collection nozzle 51 is closer to the road surface G than this range, the suction of dust will be worse when the dust collection nozzle 51 is positioned so as not to block the laser light L. Furthermore, if the dust collection nozzle 51 is farther from the road surface G than this range, the dust will be scattered from the road surface G over a wide area, and the suction efficiency will be worsened.

[0058] The dust discharge section 52 is a tubular section that extends from the dust collection nozzle 51 to the outside and transports air to an externally provided dust collection filter (not shown). One end of the dust discharge section 52 is connected to the dust collection nozzle 51, and the other end is connected to the dust collection filter. The dust discharge section 52 is also connected to a suction machine (not shown), and the inside of the dust discharge section 52 is controlled to a negative pressure, thereby sucking air from the dust collection nozzle 51 and transporting it to the dust collection filter. The dust collection filter separates the dust sucked from the dust collection nozzle 51 and transported by the dust discharge section 52 from the air.

[0059] In the road surface skid resistance restoration device 110 of this embodiment, by irradiating the road surface G with laser light L from the laser light irradiator 30 and changing the irradiation position with the irradiation position changer 40, it is possible to uniformly blast the road surface G with the laser light L, suppressing noise and dust generation and reducing the environmental load while uniformly restoring the skid resistance value of the road surface G. In addition, the road surface skid resistance restoration device 110 has a dust collector 50 that sucks up dust, and a dust collection nozzle 51 of the dust collector 50 is disposed between the laser light irradiator 30 and the irradiation position, so that it is possible to effectively suppress the scattering of dust generated from the road surface G by the irradiation of the laser light L.

[0060] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0061] 100,110...Road surface skid resistance recovery device 10...Control unit 20...Frame section 21... Caster part 30...Laser light irradiation unit 31...Irradiation head unit 32...Main body 33...Holding part 34...Optical fiber section 40...Irradiation position changing unit 41...Y-axis slide part 42...X-axis slide part 43…Support Department 50...Dust collection section 51...Dust collection nozzle 52...Dust discharge section

Claims

1. a laser light irradiation unit that irradiates a road surface with laser light; A road surface skid resistance restoration device comprising an irradiation position changing unit that changes an irradiation position on the road surface to which the laser light is irradiated.

2. The road skid resistance restoration device according to claim 1, a frame portion that holds the laser light irradiation unit and the irradiation position changing unit; A road surface skid resistance restoration device comprising a caster unit for movably mounting the frame unit on the road surface.

3. The road skid resistance restoration device according to claim 1, The road surface skid resistance restoration device is characterized in that the irradiation position changing unit moves the laser light irradiation unit within a plane parallel to the road surface.

4. The road skid resistance restoration device according to claim 1, The road skid resistance restoration device is characterized in that the irradiation position changing unit changes the irradiation position at a constant speed.

5. The road skid resistance restoration device according to claim 1, The road surface skid resistance restoration device is characterized in that the intensity of the laser light emitted by the laser light irradiation unit is in the range of 10 W or more and 500 W or less.

6. The road skid resistance restoration device according to claim 1, The road surface skid resistance restoration device is characterized in that the laser light emitted by the laser light irradiation unit is pulsed and has a frequency in the range of 10 kHz to 500 kHz.

7. The road skid resistance restoration device according to claim 1, It has a dust collection section that sucks up dust, A road surface skid resistance restoration device, characterized in that the dust collection nozzle of the dust collection unit is disposed between the laser light irradiation unit and the irradiation position.

8. The road skid resistance restoration device according to any one of claims 1 to 7, the laser light irradiation unit has a light scanning unit that irradiates the road surface with the laser light at an amplitude W, A road surface skid resistance restoration device, characterized in that the distance traveled by the irradiation position changing unit in one movement is half the amplitude W.

9. a laser light irradiation step of irradiating a road surface with laser light; a step of changing an irradiation position on the road surface where the laser light is irradiated, the step of changing an irradiation position on the road surface where the laser light is irradiated.

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