Road surface milling device and road surface milling method

Abstract

Provided is a road surface cutting device and a road surface cutting method capable of transporting waste material from a road surface cut by a cutting unit to the foot of a slope. [Solution] The road surface milling device 100 includes a self-propelled vehicle 200, a milling unit 300 that mills the road surface, a screw conveyor 400 that sends out waste materials from the road surface laterally, and a transport unit 500 that transports the waste materials from the road surface further laterally. The transport unit 500 has a basic unit 520 including a first frame 522 extending in the vehicle width direction, a first driving sprocket 524 attached to one end of the frame, a first driven sprocket 526 attached to the other end 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 that drives and rotates the first driving sprocket 524, and first brushes 532 attached to multiple points of the first roller chain 528.

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) of automobile test courses, bicycle racing tracks, etc., a method is adopted in which a road cutting device as described in JP-A-11-148107 (Patent Document 1) is used to cut the existing asphalt mixture layer to a specified depth and pave the cut surface with asphalt mixture or the like. When cutting the asphalt pavement of a slope with a road cutting device, the waste asphalt mixture of the road surface cut by the cutting unit (hereinafter referred to as "waste material") is sent down the slope by a screw conveyor and remains in a streak below the road cutting device. For this reason, after roughly removing the streak-like road waste material with the bucket of a backhoe, a worker sweeps up the road waste material that could not be removed by the backhoe 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 the debris remaining on the road surface, especially on curved slopes where the inclination angle is not constant. Also, when a worker sweeps up the debris on the road surface with a broom, the sweeping work is laborious and there is a possibility that the worker may slip on the remaining debris on the road surface.

[0005] Therefore, an object of the present invention is to provide a road surface cutting device and a road surface cutting method that are capable of transporting waste materials from the road surface cut by the cutting unit to the foot of a 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 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 of the road surface milled by the milling unit to a 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 transferring the waste material of the road surface sent out by the screw conveyor to a further side of the self-propelled vehicle. The transfer unit has the following basic units. The basic unit includes a first frame having an elongated shape extending in the vehicle width direction from the underside of the body of the self-propelled vehicle in the vehicle width direction, a first driving 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 stretched between the first driving sprocket and the first driven sprocket, a motor that rotates and drives the first driving sprocket, and first brushes attached to multiple points of the first roller chain.

[0007] In the road surface cutting method, a road surface cutting device as described above is used, and while a 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 transport unit is swept further out to the side of the self-propelled vehicle. Effect of the Invention

[0008] According to the present invention, the road surface cutting device and road surface cutting method are capable of transporting waste material from the road surface cut by the cutting unit to the toe of the slope. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a side view showing an example of a road surface cutting device. [Diagram 2] FIG. 2 is a plan view showing an example of a road surface cutting device. [Diagram 3] FIG. 4 is a partial enlarged view showing an example of a cutting unit. [Figure 4] FIG. 13 is a partial enlarged view showing the state of the cutting unit when cutting a curved inclined surface. [Diagram 5] FIG. 4 is an explanatory diagram of a trajectory of a cutter bit on a cutting drum. [Figure 6] FIG. 2 is a plan view showing an example of a basic unit in the transfer unit. [Figure 7] FIG. 2 is a side view showing an example of a basic unit in the transfer unit. [Figure 8] 1 is an explanatory diagram of a configuration in which a basic unit is rotatably attached to the bottom surface of a body of a self-propelled vehicle. FIG. [Figure 9] FIG. 13 is a plan view showing an example of an expansion unit in the transfer unit. [Figure 10] FIG. 13 is an explanatory diagram of a state in which cutting of a curved slope is started. [Figure 11] FIG. 13 is an explanatory diagram of a state in which cutting work is being performed on a curved slope. [Figure 12] FIG. 13 is an explanatory diagram of the state in which the road surface cutting device is moved on a curved slope. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 arbitrarily change and modify the present embodiment within the technical scope of the present 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 waste material from the road surface cut by the cutting unit 300 to the side of the self-propelled vehicle 200, and a transport unit 500 attached to the underside of the body of the self-propelled vehicle 200 and transporting the waste material from the road surface sent out by the screw conveyor 400 to a further 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 a telescopic cylinder 240 that can be extended and retracted in the vertical direction of the vehicle body 230. Here, as the telescopic cylinder 240, for example, a hydraulic cylinder using hydraulic oil supplied from a hydraulic pump driven by a diesel engine or an electric motor as a drive source can be used (same 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 the rear wheels 220 relative to the vehicle body 230 can be changed, and the ground clearance of the self-propelled vehicle 200 can be changed as desired.

[0013] 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 lower 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 by, for example, a telescopic cylinder (not shown) that can be extended and retracted in the vehicle width direction. Note that the base member 260 is not limited to a substantially rectangular parallelepiped shape with an open lower surface, and can have any shape that can ensure 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 interval to the underside of the base member 260 with their plate surfaces positioned on a plane perpendicular to the front-rear direction of the vehicle body 230. Here, the support members 270 are positioned approximately in the center of the base member 260 in the vehicle width direction, and can also be integrated with the base member 260.

[0015] The cutting unit 300 is disposed between the front wheels 210 and the 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 suppress a change in the posture of the self-propelled vehicle 200 due to 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 has a two-part shape in which both ends can be relatively displaced in the vertical direction with respect to the center in the axial direction, and the divided parts of the cutting drum 320 have an uneven shape that can be fitted together with a predetermined interval. Here, the predetermined interval can be an interval at which the two divided cutting drums 320 do not interfere with each other even if both ends are maximally displaced in the vertical direction with respect to the center in the axial direction (hereinafter referred to as the "maximum displacement state"). The axial dimension (length) of the uneven shape of the cutting drum 320 is determined so that the tips of the cutter bits of the two divided cutting drums 320 do not separate when in the maximum displacement state. Therefore, when in the maximum displacement state, 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 split drums 340 includes a cutter drum 342 having a substantially cylindrical shape and a plurality of cutter bits 344 detachably attached to the outer peripheral surface of the cutter drum 342. In the pair of split drums 340, the ends of the cutter drums 342 facing each other are formed into a concave-convex shape 342A that can be fitted to each other at a predetermined interval. In the illustrated example, the end of the cutter drum 342 is formed into a rectangular wave (square wave) shape having 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 are fitted 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 as exemplified, and may be a well-known shape such as a triangular wave shape, a sawtooth wave shape, or a sine wave shape. In addition, the uneven shape 342A of the cutter drum 342 is not limited to two periods, but may be three or more periods. Here, the "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] The joint 360 is composed 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-rear direction of the vehicle body 230, with the two connecting parts of the universal joints in the 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 the split drums 340 can be brought closer to each other.

[0019] Both ends of the pair of split drums 340 located on the outer side of the vehicle width are attached to a pair of left and right brackets 370 fixed to a support member 270. Here, 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 are substantially rectangular parallelepipeds with open lower surfaces and side surfaces located inward of the vehicle width, and have an inclined portion that widens outward of the vehicle width as it goes upward, so that the brackets can tilt in a V shape in a side view. The lower portions of the ends of the pair of left and right brackets 370 located inward of the vehicle width are attached to the tip portion (lower end portion) of the support member 270 so that the brackets can swing around two rotation shafts 380 extending in the front-rear direction of the vehicle body 230. Therefore, the pair of left and right brackets 370 can tilt in a V shape around the two rotation shafts 380. Here, the "V shape" is not limited to a perfect V shape, but may be a shape that can be recognized as a V shape by appearance (same below).

[0021] Further, a motor MTR such as a hydraulic motor or an electric motor is fixed to a portion located on the vehicle width outer side of the pair of left and right brackets 370, which supports and rotates both ends of the pair of split drums 340. Thus, each split drum 340 is supported in a cantilevered state by the bracket 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, so that the pair of split drums 340 can be tilted 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 about a rotation axis extending in the front-rear 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, the pair of brackets 370 tilt in a V shape as shown in Fig. 4, and the pair of split drums 340 fixed to them in a cantilevered state also tilt in a V shape.

[0024] When 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 the cutter drums 342 are separated on the lower surface, resulting in a portion where the road surface cannot be cut. However, since the uneven shapes 342A of the cutter drums 342 are fitted together at a predetermined interval and the cutter bits 344 are attached to the uneven shapes 342A, the cutting range of the cutter bits 344 of one cutter drum 342 and the cutting range of the cutter bits 344 of the other cutter drum 342 overlap in the axial center of the pair of split drums 340. Therefore, even if 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 the cutter drums 342 do not separate on the lower surface, and the occurrence of a portion where the road surface cannot be cut can be avoided.

[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 self-propelled vehicle 200 and the cutting unit 300, so that the conveying direction extends in the vehicle width direction of the vehicle body 230. Between the cutting drum 320 of the cutting unit 300 and the screw conveyor 400, a waste material receiver 410 is attached, which receives waste material from the road surface cut by the cutting drum 320 and sends it 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 to the screw conveyor 400, and is sent to the side of the self-propelled vehicle 200 and discharged by operating the screw conveyor 400.

[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 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 rotating 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 inclination angle of the screw conveyor 400 can be arbitrarily changed.

[0027] As shown in FIG. 1 and FIG. 2, the transport unit 500 is disposed behind the cutting unit 300, that is, between the cutting unit 300 and the rear wheel 220 of the self-propelled vehicle 200, in order to transport the road waste material 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 has 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 can be arbitrary. 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, but is not limited thereto, and it is also possible to attach it to a position shifted to one side in the left and right direction from the center of the vehicle width direction of the body 230.

[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 a predetermined distance therebetween, 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 driving sprocket 524 is rotatably attached to one end of the first frame 522 in the longitudinal direction. Specifically, bearings 524B are attached to one end of each of the pair of first members 522A via brackets 524A, and both ends of the rotating shaft 524C are rotatably supported by the two bearings 524B. The first driving sprocket 524 is fixed integrally to the middle part 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 end in the longitudinal direction of the first frame 522. Specifically, similar to the first driving sprocket 524, bearings 526B are attached to the other ends of the pair of first members 522A via brackets 526A, and both ends of the rotating shaft 526C are rotatably supported by the two bearings 526B. The first driven sprocket 526 is fixed integrally to the middle part of the rotating shaft 526C, for example, at a position equidistant from the two bearings 526B.

[0032] A first roller chain 528 is threaded between a first driving sprocket 524 and a first driven sprocket 526 .

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

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

[0035] 8, the basic unit 520 is attached to the bottom surface of the vehicle body 230 of the self-propelled vehicle 200 so as to be able to swing in the vertical direction. Specifically, a fixed member 560 extending in the vehicle width direction of the vehicle body 230 and a pair of hanging members 562 extending downward in parallel from both ends of the fixed member 560 are attached to a predetermined location on the bottom surface of the vehicle body 230, with a predetermined distance in the front-rear direction of the self-propelled vehicle 200 corresponding to the width of the basic unit 520. A pair of swinging members 564 swingable around a rotation axis extending in the front-rear direction of the vehicle body 230 are attached to the tip end of each of the hanging members 562. A long hole 564A extending along the longitudinal direction is formed at 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 in the long 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 a resistance force, the pair of swinging members 564 swing 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 vehicle body 230 of the self-propelled vehicle 200. Therefore, by adopting such an ingenuity, it is possible to cope with not only road surfaces with a substantially constant inclination angle, but also curved slopes with a variable 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, the relative angles of these also change following the curved slope, so that there is no problem in coping with the curved slope. The reference numeral 566 shown in FIG. 8 denotes a chain that regulates the angle of the basic unit 520 relative to the bottom surface of the vehicle body 230.

[0037] As shown in FIG. 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] The second frame 542 includes a pair of first members 542A arranged in parallel with a predetermined distance therebetween, 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, similar to the first frame 522. 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 driving sprocket 544 is rotatably attached to one end of the second frame 542 in the longitudinal direction. Specifically, bearings 544B are attached to one end of each of the pair of first members 542A via brackets 544A, and both ends of the rotating shaft 544C are rotatably supported by the two bearings 544B. The second driving sprocket 544 is fixed integrally to the middle part 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 end in the longitudinal direction of the second frame 542. Specifically, similar to the second driving 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 fixed integrally to the middle part of the rotating shaft 546C, for example, at a position equidistant from the two bearings 546B.

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

[0042] The second brushes 550 are attached to a plurality of spaced apart positions of the second roller chain 548. Like the first brush 532, the second brush 550 includes two types of brush elements (not shown) of different lengths, and the two types of brush elements are arranged alternately. Note that the second brush 550 is desirably made of an elastic material, such as nylon, which is durable and inexpensive.

[0043] The expansion unit 540 is connected to the basic unit 520 or another expansion unit 540 so as to be rotatably driven, as described below. That is, one of the two expansion units 540 is connected to the tip of the basic unit 520 extending outward from the vehicle body 230 of the self-propelled vehicle 200 in the vehicle width direction, as shown in FIG. 2. Specifically, a rotating shaft 526C integrated with the first driven sprocket 526 of the basic unit 520 is coaxially connected to a rotating shaft 544C integrated with the second driving sprocket 544 of the expansion unit 540. Here, the basic unit 520 and the expansion unit 540 may be connected to each other by connecting the respective rotating shafts 526C and 544C via other members, or may be connected to each other by using a shared rotating shaft. Therefore, when the first driven sprocket 526 of the basic unit 520 rotates, the rotational driving force is transmitted to the second driving sprocket 544 of the expansion unit 540, and as a result, the second roller chain 548 of the expansion unit 540 rotates. 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 is necessary to receive and further transport road waste materials transported by the basic unit 520 or other expansion units 540.

[0044] Here, if the basic unit 520 and the expansion unit 540 are connected only via the rotating shafts 526C and 544C, the basic unit 520 and the expansion unit 540 can be bent relative to each other around the rotating shafts 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] Also, the other of the two expansion units 540 is connected to the tip of one of the two expansion units 540 as shown in FIG. 2. Specifically, the rotation shaft 546C integrated with the second driven sprocket 546 of one expansion unit 540 is coaxially connected to the rotation shaft 544C integrated with the second driving sprocket 544 of the other expansion unit 540. Here, the two expansion units 540 may be connected by connecting the respective rotation shafts 546B and 544C via other members, or may be connected using a shared rotation shaft. Therefore, when the second driven sprocket 546 of one expansion unit 540 rotates, the rotation driving force is transmitted to the second driving sprocket 544 of the other expansion unit 540, and as a result, the second roller chain 548 of the other expansion unit 540 rotates. In short, the other expansion unit 540 rotates by the rotation driving 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 the 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 cutting device 100 will be described with reference to Figures 10 to 12. Here, while the self-propelled vehicle 200 is traveling in the direction in which the curved slope 600 extends, the road surface is cut by the cutting unit 300 at predetermined width intervals along the transverse direction of the curved slope 600, waste materials from the road surface are sent out to the side of the self-propelled vehicle 200 by the screw conveyor 400, and the transport unit 500 transports the waste materials from the road surface further to the side of the self-propelled vehicle 200.

[0048] [Step 1] When starting work to repair the curved slope 600, as shown in Fig. 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 part 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 the expansion units 540 relative to the basic unit 520 of the transport unit 500 so that the transport 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 to a position where milling of the road surface is to be started, as shown in Fig. 11. Then, when the movement of the road surface milling device 100 and the support cart 700 is completed, the extension unit 540 of the transport unit 500 that has been folded up is unfolded to make it possible to transport the 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 can be shaped to match the curved slope 600 as a whole.

[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 appropriately extended and retracted to tilt the cutting drum 320 into a V-shape following the curved slope 600, as shown in FIG.

[0051] [Step 4] While rotating the cutting drum 320 of the cutting unit 300, the telescopic cylinder 240 of the mobile vehicle 200 is contracted, and the cutting drum 320 is moved downward. Then, the existing road surface is 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, so that the cutting accuracy can be improved.

[0052] [Step 5] The road surface milling device 100 and the support cart 700 are made to travel along the direction in which the curved slope 600 extends, and the road surface is milled in a strip shape with a predetermined width. At this time, since the road surface milling device 100 is connected to the support cart 700 via the wire rope 800, it does not slide down toward the bottom of the curved slope 600, and can continuously mill the road surface with high precision. In addition, the waste material of the road surface milled by the milling drum 320 is received by the waste material receiver 410 and sent to the screw conveyor 400, and is sent to the side of the self-propelled vehicle 200 by operating the screw conveyor 400 and discharged onto the road surface. The waste material of the road surface discharged onto the road surface is supplied to the transfer unit 500 by the traveling of the self-propelled vehicle 200, 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, and is discharged from the tip of the expansion unit 540 to the foot of the slope 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 that they elastically deform in accordance with 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 is 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 the expansion units 540 are folded up relative to the basic unit 520 of the transport unit 500.

[0054] [Step 7] As shown in Fig. 12, the road surface cutting device 100 and the support cart 700 are moved to the next cutting start position, and the extension unit 540 of the transport unit 500 is deployed. At this time, at least one extension unit 540 of the transport unit 500 is deployed, taking into consideration the distance to the foot of the curved slope 600. Thereafter, [Step 3] to [Step 6] are repeated in sequence until cutting of the entire curved slope 600 is completed. Note that when the distance to the foot of the curved slope 600 is short, all extension 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 by only the basic unit 520.

[0055] [Step 8] When cutting of the road surface by the road surface cutting device 100 is completed, if necessary, a road surface sweeper or broom is used to collect and clean up any waste materials remaining on the curved slope 600.

[0056] [Step 9] After the asphalt emulsion is spread on the road surface after cleaning, the asphalt mixture is spread evenly on the asphalt mixture by 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 evenly spread asphalt mixture is then compacted using a slope iron wheel roller or 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. Therefore, the curved slope 600 can be cut in a shape following its cross-sectional shape, and the work of cutting deeper than the design value is not necessary. Therefore, the leveling work for paving the asphalt mixture is unnecessary or reduced, and the construction period can be extended and the cost increase can be suppressed. In addition, when the cross-sectional shape of the road surface changes continuously from flat to three-dimensional curves, the attitude of the cutting drum 320 can be continuously changed to accommodate this.

[0059] The road surface milling device 100 may be provided with a control device with a built-in computer, and may control the telescopic cylinder 390 of the cutting drum 320 according to cutting depth data input in advance. In this case, the road surface milling device 100 may measure 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 surface milling device 100 can easily respond 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 surface milling device 100 may further control the telescopic cylinder 240 that moves the front wheels 210 and rear wheels 220 up and down according to the cutting depth data.

[0060] As described above, the road surface waste material cut by the cutting unit 300 of the road surface cutting device 100 is sent out to the side of the self-propelled vehicle 200 by the screw conveyor 400 arranged in front of the cutting unit 300, and then transferred further to the side of the self-propelled vehicle 200 by the transfer unit 500 arranged behind the cutting unit 300. At this time, the extension unit 540 can be folded with respect to the basic unit 520 of the transfer unit 500 according to the distance from the road surface cutting device 100 to the foot of the curved slope 600, so that 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 of the embodiments as appropriate, or replacing parts of the embodiments 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 of the road surface. In addition, the pair of split drums 340 in the cutting drum 320 may be tilted into a V-shape (inverted V-shape) when viewed from the front-rear direction of the self-propelled 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 necessarily have to be a perfect V-shape, but may be one that can be recognized as a V-shape by appearance.

[0064] The road surface milling device 100 is not limited to a configuration in which the cutting drum 320 can tilt in a V-shape, and may be a general configuration in which the cutting drum 320 has a simple cylindrical shape. Also, the transport unit 500 may be attached, for example, by using 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, in order to easily supply hydraulic pressure or electricity to the motor 530 of the transport unit 500, for example, a hydraulic hose or a power cable may be connected to the body 230 by a one-touch coupler.

[0065] Furthermore, when 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 the transport unit 500 that is suitable for the width of the slope to be cut.

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

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

Claims

1. A road surface cutting device comprising: a self-propelled vehicle; a cutting unit attached to an underside of a body of the self-propelled vehicle for cutting a road surface; a screw conveyor attached to the underside of the body of the self-propelled vehicle and in front of the cutting unit for sending out waste material of the road surface cut by the cutting unit to a side of the self-propelled vehicle; and a transport unit attached to the underside of the body of the self-propelled vehicle and behind the cutting unit for transporting the waste material of 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 a vehicle width direction from the bottom surface of the body of the self-propelled vehicle, a first driving 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 stretched between the first driving sprocket and the first driven sprocket, a motor that drives and rotates the first driving sprocket, and first brushes attached to multiple points of the first roller chain. Road cutting equipment.

2. the transfer unit further includes, 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 points of 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. A 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 the other expansion unit is connected to the rotation shaft of the second driven sprocket of the expansion unit. A road surface milling device according to claim 2.

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

5. In the basic unit, the first driving sprocket, the first driven sprocket, and the first roller chain are arranged in two parallel sets, 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. A 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. A road surface milling device according to claim 2.

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

8. The basic unit of the transport unit is attached to the bottom surface of the vehicle body of the self-propelled vehicle so as to be swingable in the vertical direction. A 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 traveling, the road surface is cut by the cutting unit, while the waste material of the road surface is sent out to the side of the self-propelled vehicle by the screw conveyor, and the waste material of the road surface sent out to the side of the self-propelled vehicle by the transport unit is swept out to a further side of the self-propelled vehicle. Road surface cutting method.

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