Road surface cutting device and road surface cutting method

Abstract

To provide a road surface cutting device and a road surface cutting method capable of transferring a waste material of a road surface cut by a cutting unit to a slope toe.SOLUTION: A road surface cutting device 100 is provided with a self-traveling vehicle 200, a cutting unit 300 for cutting a road surface, a screw conveyor 400 for sending out waste materials of the road surface to the side, and a transfer unit 500 for transferring the waste materials of the road surface to the further side. A transfer unit 500 includes a first frame 522 extending in the vehicle width direction, a first driving sprocket 524 attached to one end part thereof, a first driven sprocket 526 attached to the other end part of the first frame 522, a first roller chain 528 wound between the first driving sprocket 524 and the first driven sprocket 526, a motor 530 for rotatably driving the first driving sprocket 524, and a basic unit 520 including a first brush 532 attached to each of a plurality of positions of a first roller chain 528.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a road surface milling device and a road surface milling method. [Background technology]

[0002] When renovating slopes (banks) such as those on automobile test courses and bicycle racing tracks, a construction method is adopted in which a road surface milling device, such as that described in Japanese Patent Application Laid-Open No. 11-148107 (Patent Document 1), is used to cut a predetermined depth into the existing asphalt mixture layer and then pave the cut surface with an asphalt mixture or the like. When the road surface milling device mills the asphalt pavement on a slope, the waste asphalt mixture (hereinafter referred to as "waste") cut by the milling unit is sent down the slope by a screw conveyor and remains in a streak below the road surface milling device. For this reason, the streak-like waste material on the road surface is roughly removed with a backhoe bucket, and then workers sweep up the road surface waste material that the backhoe was unable to remove with a broom. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-148107 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because the opening of the backhoe bucket is square, it is difficult to remove road debris remaining on a curved slope, especially when the slope angle is not constant. Also, when workers sweep the road debris with a broom, the sweeping work is laborious and there is a risk that the workers will slip on the remaining road debris.

[0005] Therefore, an object of the present invention is to provide a road surface milling device and a road surface milling method that can transport waste material from the road surface milled by the milling unit to the foot of the slope. [Means for solving the problem]

[0006] The road surface milling device includes a self-propelled vehicle, a milling unit attached to the underside of the self-propelled vehicle and configured to mill the road surface, a screw conveyor attached to the underside of the self-propelled vehicle in front of the milling unit and configured to send road surface waste material milled by the milling unit to the side of the self-propelled vehicle, and a transfer unit attached to the underside of the self-propelled vehicle and behind the milling unit and configured to transfer the road surface waste material sent out by the screw conveyor further to the side of the self-propelled vehicle. The transfer unit has the following basic units: a first frame having an elongated shape extending in the vehicle width direction from the underside of the self-propelled vehicle's body, a first drive sprocket attached to one end of the first frame in the longitudinal direction, a first driven sprocket attached to the other end of the first frame in the longitudinal direction, a first roller chain looped between the first drive sprocket and the first driven sprocket, a motor that rotates and drives the first drive sprocket, and first brushes attached to multiple locations on the first roller chain.

[0007] In the road surface cutting method, a road surface cutting device such as that described above is used, and while a self-propelled vehicle is running, the road surface is cut by the cutting unit, and waste material on the road surface is sent out to the side of the self-propelled vehicle by the screw conveyor, and the waste material on the road surface sent out to the side of the self-propelled vehicle by the transfer unit is swept further out to the side of the self-propelled vehicle. [Effects of the Invention]

[0008] According to the present invention, the road surface milling device and road surface milling method can transport waste material from the road surface milled by the milling unit to the foot of the slope. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a side view showing an example of a road surface milling device. [Figure 2] FIG. 2 is a plan view showing an example of a road surface cutting device. [Figure 3] FIG. 2 is a partial enlarged view showing an example of a cutting unit. [Figure 4] FIG. 10 is a partially enlarged view showing the state of the cutting unit when cutting a curved slope. [Figure 5] FIG. 10 is an explanatory diagram of the trajectory of a cutter bit on a cutting drum. [Figure 6] FIG. 10 is a plan view showing an example of a basic unit in the transfer unit. [Figure 7] FIG. 10 is a side view showing an example of a basic unit in the transfer unit. [Figure 8] 10 is an explanatory diagram of a configuration in which a basic unit is attached to the underside of the body of a self-propelled vehicle so as to be swingable. FIG. [Figure 9] FIG. 10 is a plan view showing an example of an expansion unit in the transfer unit. [Figure 10] FIG. 10 is an explanatory diagram of a state in which cutting of a curved slope is started. [Figure 11] FIG. 10 is an explanatory diagram of a state in which cutting work is being performed on a curved slope. [Figure 12] FIG. 10 is an explanatory diagram of the state in which the road surface milling device is moved on a curved slope. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show an example of a road surface milling device 100 to which this embodiment can be applied. Note that the road surface milling device 100 described below is merely an example to which this embodiment can be applied, and should not be construed as being limited to this configuration. Therefore, it goes without saying that a person skilled in the art can make any changes and modifications within the technical scope of this embodiment.

[0011] The road surface cutting device 100 comprises a self-propelled vehicle 200, a cutting unit 300 attached to the underside of the body of the self-propelled vehicle 200 and cutting the road surface, a screw conveyor 400 attached to the underside of the body of the self-propelled vehicle 200 and sending out road surface waste material cut by the cutting unit 300 to the side of the self-propelled vehicle 200, and a transfer unit 500 attached to the underside of the body of the self-propelled vehicle 200 and transporting the road surface waste material sent out by the screw conveyor 400 further to the side of the self-propelled vehicle 200.

[0012] The self-propelled vehicle 200 has a pair of left and right front wheels 210 and a pair of left and right rear wheels 220 driven by, for example, a diesel engine or an electric motor. The pair of left and right front wheels 210 and the pair of left and right rear wheels 220 are attached to the vehicle body 230 via telescopic cylinders 240 that can extend and retract in the up and down direction of the vehicle body 230. Here, the telescopic cylinder 240 can be, for example, a hydraulic cylinder powered by hydraulic oil supplied from a hydraulic pump driven by a diesel engine or an electric motor (the same applies below). Therefore, by appropriately controlling the supply and discharge of hydraulic oil to the telescopic cylinder 240, the vertical positions of the front wheels 210 and rear wheels 220 relative to the vehicle body 230 can be changed, and the ground clearance of the self-propelled vehicle 200 can be freely changed.

[0013] Furthermore, a pair of guide rails 250 extending parallel to the vehicle width direction are attached to the bottom surface of the vehicle body 230, specifically, the bottom surface located between the pair of left and right front wheels 210 and the pair of left and right rear wheels 220. A base member 260, for example, having a substantially rectangular parallelepiped shape with an open bottom surface, is slidably attached between the pair of guide rails 250 as a member for suspending and supporting the cutting unit 300. The base member 260 slides in the vehicle width direction along the guide rails 250, for example, by a telescopic cylinder (not shown) that is telescopic in the vehicle width direction. Note that the base member 260 is not limited to a substantially rectangular parallelepiped shape with an open bottom surface, and can have any shape that ensures the required strength, such as a substantially rectangular shape in a plan view.

[0014] 1 and 3, a pair of support members 270 having a generally trapezoidal shape whose width gradually decreases toward the tip are attached at a predetermined distance to the underside of base member 260, with their plate surfaces positioned on a plane perpendicular to the front-to-rear direction of vehicle body 230. Here, support members 270 are positioned approximately in the center of base member 260 in the vehicle width direction, and can also be integrated with base member 260.

[0015] The cutting unit 300 is disposed between the front wheels 210 and rear wheels 220 of the self-propelled vehicle 200 and near the center of gravity of the self-propelled vehicle 200, for example, in order to prevent the attitude of the self-propelled vehicle 200 from being changed by a reaction force when cutting the road surface. As shown in FIG. 3 , the cutting unit 300 has a cutting drum 320 whose rotation axis extends in the vehicle width direction of the vehicle body 230. The cutting drum 320 is divided into two parts so that both ends can be displaced vertically relative to the center in the axial direction, and the divided parts of the cutting drum 320 have an uneven shape that can fit together at a predetermined distance. Here, the predetermined distance can be set to a distance that prevents the two divided parts of the cutting drum 320 from interfering with each other even when both ends are displaced maximum vertically relative to the center in the axial direction (hereinafter referred to as the "maximum displacement state"). Furthermore, the axial dimension (length) of the uneven shape of the cutting drum 320 is determined so that, in the maximum displacement state, the tips of the cutter bits of the two divided cutting drums 320 do not separate. Therefore, in the maximum displacement state of the two divided cutting drums 320, the cutter bits of one cutting drum 320 and the cutter bits of the other cutting drum 320 overlap within a predetermined axial range including the division point.

[0016] The cutting unit 300 will be described in detail below. The cutting drum 320 has a pair of divided drums 340 arranged in series along the vehicle width direction of the vehicle body 230, and a joint 360 connecting opposing ends of the pair of divided drums 340.

[0017] The pair of divided drums 340 includes a substantially cylindrical cutter drum 342 and a plurality of cutter bits 344 detachably attached to the outer peripheral surface of the cutter drum 342. In the pair of divided drums 340, the opposing ends of each cutter drum 342 are formed with a concave-convex shape 342A that can fit together at a predetermined interval. In the illustrated example, the end of the cutter drum 342 is formed in a rectangular wave (square wave) shape with two periods, that is, a shape having two convex portions and two concave portions. The convex portions and concave portions of one cutter drum 342 fit into the concave portions and convex portions of the other cutter drum 342 at a predetermined interval. The concave-convex shape 342A of the cutter drum 342 is not limited to the rectangular wave shape shown in the example, and may be any known shape such as a triangular wave shape, a sawtooth wave shape, or a sine wave shape. Furthermore, the uneven shape 342A of the cutter drum 342 is not limited to two cycles, but may be three or more cycles. Here, the terms "square wave," "triangular wave," "sawtooth wave," and "sine wave" are not limited to exact waveforms, but may be waveforms that can be recognized visually.

[0018] Joint 360 is made up of two universal joints connected in series so as to synchronize the rotation of the pair of split drums 340 and enable the pair of split drums 340 to tilt in at least a V-shape. Therefore, the pair of split drums 340 can tilt in a V-shape around a rotation axis extending in the front-to-rear direction of the vehicle body 230, with the two connecting portions of the universal joints in joint 360 as the rotation center. Here, by shortening the length of the member located in the center of the universal joint, the rotation centers of each split drum 340 can be brought closer together.

[0019] The pair of split drums 340 have their ends located on the outer side of the vehicle width attached to a pair of left and right brackets 370 fixed to the support member 270. The pair of left and right brackets 370 are capable of swinging about two rotation shafts 380 extending in the front-rear direction of the vehicle body 230.

[0020] That is, the pair of left and right brackets 370 have a generally rectangular parallelepiped shape with openings on the bottom and the side surfaces located inward in the vehicle width direction, and the upper portions of the ends located inward in the vehicle width direction are inclined portions that widen outward in the vehicle width direction as they extend upward so as to enable tilting in a V-shape in a side view. The lower portions of the ends located inward in the vehicle width direction of the pair of left and right brackets 370 are attached to the leading ends (lower ends) of the support members 270 so as to be able to swing about two rotation shafts 380 extending in the fore-and-aft direction of the vehicle body 230. Therefore, the pair of left and right brackets 370 can tilt in a V-shape about the two rotation shafts 380. Here, the "V-shape" does not necessarily mean a perfect V-shape, but may be one that can be visually recognized as a V-shape (the same applies below).

[0021] Additionally, a motor MTR such as a hydraulic motor or an electric motor is fixed to portions of the pair of left and right brackets 370 located outward in the vehicle width direction, and supports and rotates both ends of the pair of split drums 340. Therefore, each split drum 340 is supported in a cantilevered manner by the brackets 370 via the motor MTR.

[0022] Here, it is desirable that the two rotation shafts 380 are concentric with the two connecting portions of the universal joint in the joint 360. In this way, the split drum 340 and the bracket 370 swing together, allowing the pair of split drums 340 to tilt smoothly.

[0023] The tips of a pair of telescopic cylinders 390 are fixed to the outer surfaces of the pair of left and right brackets 370, located on the outer side of the vehicle width, so as to be rotatable around a rotation axis extending in the longitudinal direction of the vehicle body 230. The middle parts of the pair of telescopic cylinders 390 are fixed to the base member 260 so as to be swingable. Therefore, when the telescopic cylinders 390 are retracted, as shown in Figure 4, the pair of brackets 370 tilt in a V shape, and the pair of split drums 340 fixed in a cantilevered state to the brackets 370 also tilt in a V shape.

[0024] If the pair of split drums 340 have a simple cylindrical shape, when they are tilted in a V-shape, the tips of the cutter bits 344 of each cutter drum 342 will separate on the underside, resulting in areas where the road surface cannot be cut. However, the concave and convex shapes 342A of each cutter drum 342 fit together at a predetermined interval, and the cutter bits 344 are attached to these. Therefore, in the axial center of the pair of split drums 340, the cutting range of the cutter bit 344 of one cutter drum 342 overlaps with the cutting range of the cutter bit 344 of the other cutter drum 342. Therefore, even when the pair of split drums 340 are tilted in a V-shape, as shown in FIG. 5, the tips of the cutter bits 344 of each cutter drum 342 will not separate on the underside, preventing areas from being left uncut.

[0025] The screw conveyor 400 is driven by a motor (not shown), such as a hydraulic motor or an electric motor, and is disposed in front of the cutting unit 300, i.e., between the front wheels 210 of the mobile vehicle 200 and the cutting unit 300, with the conveying direction extending in the vehicle width direction of the vehicle body 230. A waste material receiver 410 is attached between the cutting drum 320 of the cutting unit 300 and the screw conveyor 400, and receives waste material from the road surface cut by the cutting drum 320 and sends it out to the screw conveyor 400. Therefore, the waste material cut by the cutting drum 320 is received by the waste material receiver 410 and sent out to the screw conveyor 400, and is then sent out to the side of the mobile vehicle 200 and discharged as the screw conveyor 400 operates.

[0026] Here, the screw conveyor 400 may be movable up and down by, for example, a telescopic cylinder (not shown) so that the relative position of the screw conveyor 400 with respect to the cutting drum 320 of the cutting unit 300 can be changed. Also, one end of the screw conveyor 400 may be rotatably connected to a rotation shaft extending in the front-rear direction of the vehicle body 230, while the other end may be connected to the base member 260 via a telescopic cylinder so that the tilt angle of the screw conveyor 400 can be arbitrarily changed.

[0027] As shown in FIGS. 1 and 2 , the transport unit 500 is disposed behind the cutting unit 300, i.e., between the cutting unit 300 and the rear wheels 220 of the self-propelled vehicle 200, to transport road waste materials sent out to the side of the self-propelled vehicle 200 by the screw conveyor 400 to the further side of the self-propelled vehicle 200. The transport unit 500 includes a basic unit 520 that is detachably attached to the bottom surface of the body 230 of the self-propelled vehicle 200, and at least one expansion unit 540, the details of which will be described later. In the illustrated example, two expansion units 540 are provided, but the number of expansion units 540 can be any number. In addition, the basic unit 520 is attached to the center of the body 230 in the vehicle width direction in consideration of the weight balance of the self-propelled vehicle 200. However, the basic unit 520 can also be attached to a position offset to the left or right from the center of the body 230 in the vehicle width direction.

[0028] As shown in Figures 6 and 7, the basic unit 520 includes a first frame 522 having an elongated shape extending in the vehicle width direction from the bottom surface of the body 230 of the self-propelled vehicle 200, a first driving sprocket 524, a first driven sprocket 526, a first roller chain 528, a motor 530 such as a hydraulic motor or an electric motor, and a first brush 532.

[0029] The first frame 522 includes a pair of first members 522A arranged in parallel with each other at a predetermined distance, and a pair of second members 522B arranged perpendicular to the first members 522A and connecting the opposing inner surfaces of the pair of first members 522A. Note that the first frame 522 is not limited to the configuration shown in the figure, and may include, for example, a reinforcing member as appropriate.

[0030] The first drive sprocket 524 is rotatably attached to one longitudinal end of the first frame 522. Specifically, bearings 524B are attached to one ends of each of the pair of first members 522A via brackets 524A, and both ends of a rotating shaft 524C are rotatably supported by the two bearings 524B. The first drive sprocket 524 is integrally fixed to the middle portion of the rotating shaft 524C, for example, at a position equidistant from the two bearings 524B.

[0031] The first driven sprocket 526 is rotatably attached to the other longitudinal end of the first frame 522. Specifically, similar to the first driving sprocket 524, a bearing 526B is attached to each of the other ends of the pair of first members 522A via a bracket 526A, and both ends of the rotating shaft 526C are rotatably supported by the two bearings 526B. The first driven sprocket 526 is integrally fixed to the middle portion of the rotating shaft 526C, for example, at a position equidistant from the two bearings 526B.

[0032] The first roller chain 528 is looped between the first driving sprocket 524 and the first driven sprocket 526 .

[0033] Motor 530 is attached via bracket 530A to one longitudinal end of one first member 522A so as to rotate and drive first drive sprocket 524, which is attached to one longitudinal end of first frame 522. The output shaft of motor 530 is connected to an end of a rotary shaft 524C of first drive sprocket 524 via, for example, an Oldham coupling. Therefore, when motor 530 operates, first roller chain 528, which is wound between first drive sprocket 524 and first driven sprocket 526, rotates.

[0034] The first brushes 532 are attached to a plurality of spaced apart positions on the first roller chain 528. As shown in Fig. 7, the first brush 532 includes two types of brush elements 532A and 532B of different lengths, and these two types of brush elements 532A and 532B are arranged alternately. Note that the first brush 532 is preferably made of an elastic material, such as durable and inexpensive nylon.

[0035] 8, basic unit 520 is attached to the bottom surface of vehicle body 230 of motor-propelled vehicle 200 so as to be swingable in the up-and-down direction. Specifically, fixed member 560 extending in the vehicle width direction of vehicle body 230 and a pair of hanging members 562 extending parallel to each other downward from both ends of fixed member 560 are attached to predetermined locations on the bottom surface of vehicle body 230, with the fixed member 560 and the basic unit 520 spaced apart a predetermined distance in the front-to-rear direction of motor-propelled vehicle 200 corresponding to the width of basic unit 520. A pair of swinging members 564 swingable around a rotation axis extending in the front-to-rear direction of vehicle body 230 are attached to the tip end of each hanging member 562. A long hole 564A extending along the longitudinal direction of the pair of swinging members 564 is formed in the tip end of each of the pair of swinging members 564. A pin member PM attached to a predetermined position of the first frame 522 of the basic unit 520 is slidably fixed to the elongated holes 564A of the pair of swinging members 564.

[0036] Therefore, when the inclination angle of the road surface to be cut changes and the basic unit 520 receives resistance, the pair of swinging members 564 swings relative to the pair of hanging members 562, and as a result, the basic unit 520 can swing relative to the bottom surface of the body 230 of the self-propelled vehicle 200. By adopting such an approach, the basic unit 520 can be adapted to curved slopes with varying inclination angles, in addition to road surfaces with a substantially constant inclination angle. If the expansion unit 540 connected to the basic unit 520 and the other expansion units 540 connected to the expansion unit 540 are mutually foldable, their relative angles also change in accordance with the curved slope, thereby preventing any problems in adapting to the curved slope. Reference numeral 566 in FIG. 8 denotes a chain that regulates the angle of the basic unit 520 relative to the bottom surface of the body 230.

[0037] As shown in Figure 9, the expansion unit 540 includes an elongated second frame 542 extending parallel to the first frame 522 of the basic unit 520, a second driving sprocket 544, a second driven sprocket 546, a second roller chain 548, and a second brush 550.

[0038] Similar to the first frame 522, the second frame 542 includes a pair of first members 542A arranged in parallel with each other at a predetermined distance, and a pair of second members 542B arranged perpendicular to the first members 542A and connecting the opposing inner surfaces of the pair of first members 542A. Note that the second frame 542 is not limited to the configuration shown in the figure, and may include, for example, a reinforcing member as appropriate.

[0039] The second drive sprocket 544 is rotatably attached to one longitudinal end of the second frame 542. Specifically, bearings 544B are attached to one end of each of the pair of first members 542A via brackets 544A, and both ends of a rotating shaft 544C are rotatably supported by the two bearings 544B. The second drive sprocket 544 is integrally fixed to an intermediate portion of the rotating shaft 544C, for example, at a position equidistant from the two bearings 544B.

[0040] The second driven sprocket 546 is rotatably attached to the other longitudinal end of the second frame 542. Specifically, similar to the second drive sprocket 544, bearings 546B are attached to the other ends of the pair of first members 542A via brackets 546A, and both ends of the rotating shaft 546C are rotatably supported by the two bearings 546B. The second driven sprocket 546 is integrally fixed to the middle portion of the rotating shaft 546C, for example, at a position equidistant from the two bearings 546B.

[0041] The second roller chain 548 is threaded between the second driving sprocket 544 and the second driven sprocket 546 .

[0042] Second brushes 550 are attached to second roller chain 548 at a plurality of spaced apart positions. Similar to first brush 532, second brush 550 includes two types of brush elements (not shown) of different lengths, and these two types of brush elements are arranged alternately. Second brush 550 is preferably made of an elastic material, such as durable and inexpensive nylon.

[0043] The expansion unit 540 is rotatably connected to the basic unit 520 or another expansion unit 540, as described below. That is, one of the two expansion units 540 is connected to the tip of the basic unit 520, which extends outwardly from the body 230 of the self-propelled vehicle 200, as shown in FIG. 2 . Specifically, a rotating shaft 526C, which is integrated with the first driven sprocket 526 of the basic unit 520, is coaxially connected to a rotating shaft 544C, which is integrated with the second driving sprocket 544 of the expansion unit 540. Here, the basic unit 520 and the expansion units 540 may be connected to each other by connecting the respective rotating shafts 526C and 544C via other members, or may be connected using a shared rotating shaft. Therefore, when the first driven sprocket 526 of the basic unit 520 rotates, the rotational drive force is transmitted to the second driving sprocket 544 of the expansion unit 540, causing the second roller chain 548 of the expansion unit 540 to rotate. In short, the expansion unit 540 rotates by the rotational driving force transmitted from the basic unit 520. Note that the expansion unit 540 is disposed behind the basic unit 520 as shown in FIG. 2, since it needs to receive and further transport road surface waste material transported by the basic unit 520 or another expansion unit 540.

[0044] Here, if the basic unit 520 and the expansion unit 540 are connected only via the rotation axes 526C and 544C, the basic unit 520 and the expansion unit 540 can be bent relative to each other around these rotation axes 526C and 544C, making it possible to fold the expansion unit 540 relative to the basic unit 520 or change the relative angle between the two.

[0045] As shown in FIG. 2 , the other of the two expansion units 540 is connected to the tip of one of the two expansion units 540. Specifically, a rotating shaft 546C integrated with the second driven sprocket 546 of one expansion unit 540 is coaxially connected to a rotating shaft 544C integrated with the second drive sprocket 544 of the other expansion unit 540. Here, the two expansion units 540 may be connected by connecting the respective rotating shafts 546B and 544C via other members, or may be connected using a shared rotating shaft. Therefore, when the second driven sprocket 546 of one expansion unit 540 rotates, the rotational drive force is transmitted to the second drive sprocket 544 of the other expansion unit 540, causing the second roller chain 548 of the other expansion unit 540 to rotate. In other words, the other expansion unit 540 rotates due to the rotational drive force transmitted from the one expansion unit 540.

[0046] Here, if the two expansion units 540 are connected only via the rotation axes 546C and 544C, the two expansion units 540 can be bent relative to each other around these rotation axes 546C and 544C, making it possible to fold one expansion unit 540 relative to the other expansion unit 540 or change the relative angle between the two.

[0047] Next, a procedure for repairing a curved slope such as an automobile test course using the road surface milling device 100 will be described with reference to Figures 10 to 12. Here, with the mobile vehicle 200 traveling in the direction in which the curved slope 600 extends, the road surface is milled by the milling unit 300 at intervals of a predetermined width along the transverse direction of the curved slope 600, while the screw conveyor 400 sends out waste material from the road surface to the side of the mobile vehicle 200, and the transfer unit 500 transfers the waste material from the road surface further to the side of the mobile vehicle 200.

[0048] [Step 1] When work to repair the curved slope 600 begins, as shown in Figure 10, the road surface milling device 100 is placed at the bottom of the curved slope 600, and a support cart (roller supporter) 700 is placed on a flat section 610 formed at the top of the curved slope 600. Then, above the slope of the road surface milling device 100, the road surface milling device 100 and the boom 710 of the support cart 700 are connected by, for example, a wire rope 800. In this state, it is desirable to fold all of the expansion units 540 relative to the basic unit 520 of the transfer unit 500 so that the transfer unit 500 does not interfere with the curved slope 600 when the road surface milling device 100 is moved.

[0049] [Step 2] The road surface milling device 100 and the support cart 700 are run and moved to a position where milling of the road surface begins, as shown in Figure 11. Then, once the movement of the road surface milling device 100 and the support cart 700 is complete, the folded extension unit 540 of the transport unit 500 is unfolded, making it possible to transport waste material from the road surface. At this time, even if the inclination angle of the curved slope 600 has changed, as described above, the basic unit 520 swings relative to the body 230 of the self-propelled vehicle 200 and the angle of the extension unit 540 changes, so that the bottom surface of the transport unit 500 as a whole can be shaped to follow the curved slope 600.

[0050] [Step 3] The telescopic cylinder 240 of the self-propelled vehicle 200 is extended and retracted to move the vehicle body 230 up and down, and the height of the cutting drum 320 of the cutting unit 300 from the road surface is set to a predetermined height. Then, the telescopic cylinder 390 of the cutting unit 300 is extended and retracted as appropriate, and the cutting drum 320 is tilted into a V-shape following the curved slope 600, as shown in Figure 4.

[0051] [Step 4] While rotating the cutting drum 320 of the cutting unit 300, the telescopic cylinder 240 of the mobile vehicle 200 is retracted, and the cutting drum 320 is moved downward. The existing road surface is then cut to a predetermined depth. At this time, the cutting depth of the road surface can be set by extending and retracting the telescopic cylinder 240, which improves cutting accuracy.

[0052] [Step 5] The road surface milling device 100 and the support carriage 700 travel along the direction of the curved slope 600, milling the road surface in a strip of a predetermined width. Because the road surface milling device 100 is connected to the support carriage 700 via a wire rope 800, it does not slide down the curved slope 600 and can continuously mill the road surface with high precision. The road surface waste material milled by the milling drum 320 is received by the waste material receiver 410 and sent to the screw conveyor 400. The screw conveyor 400 is operated to send the waste material to the side of the mobile vehicle 200 and discharge it onto the road surface. The road surface waste material discharged onto the road surface is then supplied to the transfer unit 500 as the mobile vehicle 200 travels, and is transported by the rotation of the first brush 532 of the basic unit 520 and the second brush 550 of the expansion unit 540. The waste material is discharged from the tip of the expansion unit 540 to the foot of the curved slope 600. At this time, the first brush 532 of the basic unit 520 and the second brush 550 of the extension unit 540 are made up of two types of brush elements of different lengths, so they elastically deform to conform to the surface of the curved road surface 600, thereby reducing the amount of road surface waste that is not swept away by the brush elements and remains on the curved road surface 600.

[0053] [Step 6] When cutting has been completed up to the cutting end position of the road surface, the telescopic cylinder 240 of the mobile vehicle 200 is extended to move the cutting drum 320 of the cutting unit 300 away from the road surface. Then, the rotation of the cutting drum 320 is stopped and the motor 530 of the transport unit 500 is stopped. Furthermore, in order to move the road surface cutting device 100, all of the expansion units 540 are folded relative to the basic unit 520 of the transport unit 500.

[0054] [Step 7] As shown in Figure 12, the road surface milling device 100 and the support cart 700 are moved to the next milling start position, and the expansion units 540 of the transport unit 500 are deployed. At this time, at least one expansion unit 540 of the transport unit 500 is deployed, taking into account the distance to the foot of the curved slope 600. Thereafter, [Steps 3] to [Steps 6] are repeated in order until all cutting of the curved slope 600 is completed. Note that when the distance to the foot of the curved slope 600 is short, all expansion units 540 may be folded relative to the basic unit 520 of the transport unit 500, and the road surface waste material may be transported using only the basic unit 520.

[0055] [Step 8] Once cutting of the road surface by the road surface cutting device 100 is completed, any waste material remaining on the curved slope 600 is collected and cleaned using a road surface sweeper or broom, as necessary.

[0056] [Step 9] After the asphalt emulsion is spread on the road surface after cleaning, an asphalt mixture is spread evenly on top of it using an asphalt finisher for slopes. At this time, the asphalt mixture is supplied to the hopper of the asphalt finisher for slopes by, for example, a stacker and a belt conveyor.

[0057] [Step 10] The spread asphalt mixture is then compacted using a slope roller with steel wheels or a slope tire roller.

[0058] In this way, when cutting the road surface of the curved slope 600, the cutting drum 320 tilts in a V-shape to follow the curved slope 600. This allows the curved slope 600 to be cut in a shape that follows its cross-sectional shape, eliminating the need to cut deeper than designed. This eliminates or reduces the need for leveling work when paving the asphalt mixture, preventing longer construction periods and increased costs. Furthermore, when the cross-sectional shape of the road surface continuously changes from flat to three-dimensional curves, the cutting drum 320 can be adjusted to accommodate this by continuously changing its posture.

[0059] The road milling device 100 may be equipped with a control device with a built-in computer, which controls the telescopic cylinder 390 of the cutting drum 320 according to cutting depth data that has been input in advance. In this case, the road milling device 100 may determine its current position using a positioning system such as a GPS (Global Positioning System), and control the telescopic cylinder 390 according to data associated with this current position. In this way, the road milling device 100 can easily adapt to cases where the cross-sectional shape of the cutting surface of the road surface changes continuously, from flat to three-dimensional curves. The control device of the road milling device 100 may also control the telescopic cylinders 240, which move the front wheels 210 and rear wheels 220 up and down, according to cutting depth data.

[0060] As described above, the road surface waste material cut by the cutting unit 300 of the road surface milling device 100 is sent out to the side of the mobile vehicle 200 by the screw conveyor 400 arranged in front of the cutting unit 300, and then transferred further to the side of the mobile vehicle 200 by the transfer unit 500 arranged behind the cutting unit 300. At this time, by folding the expansion unit 540 relative to the basic unit 520 of the transfer unit 500 depending on the distance from the road surface milling device 100 to the foot of the curved slope 600, the road surface waste material can be discharged to the foot of the curved slope 600. The road surface waste material discharged to the foot of the curved slope 600 can be easily removed with a backhoe bucket because the foot of the curved slope 600 is approximately flat.

[0061] It is desirable that the extension unit 540 of the transport unit 500 has a length that is approximately the same as the width of the road surface that can be cut by the cutting unit 300. In this way, after cutting a road surface with the road surface cutting device 100, when cutting an adjacent road surface, it can be easily handled by folding up one of the extension units 540 of the transport unit 500.

[0062] Furthermore, a person skilled in the art will easily understand that new embodiments can be created by omitting parts of the technical ideas of the above embodiments, combining parts as appropriate, or replacing parts with well-known technology.

[0063] As one example, a sprinkler device that sprays water in a mist may be attached near the cutting drum 320 to reduce dust generated during cutting work on the road surface. Furthermore, the pair of split drums 340 of the cutting drum 320 may be tilted into a V-shape (inverted V-shape) when viewed from the front-to-rear direction of the motor-driven vehicle 200 by extending the telescopic cylinder 390. In this way, it is possible to cut not only concavely curved road surfaces but also convexly curved road surfaces. Here, the "V-shape" does not have to be a perfect V-shape, but may be one that can be recognized as such visually.

[0064] The road surface milling device 100 is not limited to a configuration in which the milling drum 320 can tilt in a V shape, and may instead have a general configuration in which the milling drum 320 has a simple cylindrical shape. Furthermore, the transport unit 500 may be attached using, for example, a well-known attachment / detachment mechanism so that it can be easily attached and detached to the bottom surface of the body 230 of the self-propelled vehicle 200. In this case, to facilitate the supply of hydraulic pressure or electricity to the motor 530 of the transport unit 500, a hydraulic hose or a power cable may be connected to the body 230 using, for example, a one-touch coupler.

[0065] Furthermore, if the width of the slope to be cut is narrow, the transport unit 500 may be configured to include only the basic unit 520. In this case, since the transport unit 500 is detachably attached to the bottom surface of the body 230 of the self-propelled vehicle 200, it is possible to select and attach a transport unit 500 that is suitable for the width of the slope to be cut.

[0066] Alternatively, the basic unit 520 of the transfer unit 500 may have two parallel sets of a first drive sprocket 524, a first driven sprocket 526, and a first roller chain 528, and the first brush 532 may be supported by the two parallel first roller chains 528. In addition to this configuration, the expansion unit 540 of the transfer unit 500 may have two parallel sets of a second drive sprocket 544, a second driven sprocket 546, and a second roller chain 548, and the second brush 550 may be supported by two parallel second roller chains 548. In this way, the first brush 532 and the second brush 550 are supported by the two parallel first roller chains 528 and second roller chains 548, so that the change in posture when transporting road waste material is reduced, and road waste material can be transported efficiently. [Explanation of symbols]

[0067] 100...Road surface cutting equipment 200...Self-propelled vehicle 230…Body 300...Cutting unit 400...Screw conveyor 500...Transport unit 520...Basic unit 522...1st frame 524...1st drive sprocket 526...First driven sprocket 526C...Rotating shaft 528...First roller chain 530...Motor 532...First brush 540...Expansion unit 542...2nd frame 544...Second drive sprocket 544C...Rotating shaft 546...2nd driven sprocket 546C...Rotating shaft 548...Second roller chain 550...2nd brush

Claims

1. A road surface milling device comprising: a self-propelled vehicle; a milling unit attached to the underside of the body of the self-propelled vehicle and milling the road surface; a screw conveyor attached to the underside of the body of the self-propelled vehicle and in front of the milling unit and sending out waste material from the road surface milled by the milling unit to the side of the self-propelled vehicle; and a transfer unit attached to the underside of the body of the self-propelled vehicle and behind the milling unit and transporting the waste material from the road surface sent out by the screw conveyor further to the side of the self-propelled vehicle, The transfer unit has a basic unit including a first frame having an elongated shape extending in the vehicle width direction from the bottom surface of the body of the self-propelled vehicle, a first drive sprocket attached to one end of the first frame in the longitudinal direction, a first driven sprocket attached to the other end of the first frame in the longitudinal direction, a first roller chain wound between the first drive sprocket and the first driven sprocket, a motor that rotates and drives the first drive sprocket, and first brushes attached to a plurality of locations on the first roller chain. Road cutting equipment.

2. the transfer unit further comprises, in addition to the basic unit, an extension unit including a second frame having an elongated shape extending parallel to the first frame, a second driving sprocket attached to one end of the second frame in the longitudinal direction, a second driven sprocket attached to the other end of the second frame in the longitudinal direction, a second roller chain wound between the second driving sprocket and the second driven sprocket, and second brushes attached to a plurality of locations on the second roller chain, The rotation shaft of the second driving sprocket of the expansion unit is connected to the rotation shaft of the first driven sprocket of the basic unit. The road surface milling device according to claim 1.

3. The transfer unit has a plurality of the expansion units, The rotation shaft of the second driving sprocket of another expansion unit is connected to the rotation shaft of the second driven sprocket of the expansion unit.

3. The road surface milling device according to claim 2.

4. The basic unit and the expansion unit, and two of the expansion units are foldably connected around the rotation axis, The road surface milling device according to claim 3.

5. In the basic unit, two sets of the first driving sprocket, the first driven sprocket, and the first roller chain are arranged in parallel, and the first brush is supported by the two first roller chains arranged in parallel, and In the expansion unit, two sets of the second driving sprocket, the second driven sprocket, and the second roller chain are arranged in parallel, and the second brush is supported by the two second roller chains arranged in parallel.

3. The road surface milling device according to claim 2.

6. the first brush and the second brush include two types of brush elements having different lengths, The two types of brush elements are arranged alternately.

3. The road surface milling device according to claim 2.

7. The basic unit of the transport unit is detachably attached to the underside of the body of the self-propelled vehicle. The road surface milling device according to claim 1.

8. The basic unit of the transport unit is attached to the bottom surface of the body of the self-propelled vehicle so as to be swingable in the vertical direction. The road surface milling device according to claim 1.

9. Using the road surface cutting device according to any one of claims 1 to 8, while the self-propelled vehicle is running, the road surface is cut by the cutting unit, while the road surface waste material is sent out to the side of the self-propelled vehicle by the screw conveyor, and the road surface waste material sent out to the side of the self-propelled vehicle by the transfer unit is swept out further to the side of the self-propelled vehicle. Road surface cutting method.

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